Liquid-jet apparatus
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Expired 28 September 2020, 6 years ago.
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23 claims: 4 independent, 19 dependent
- 1ノズル開口を有するヘッド部材と、 ノズル開口部分の液体の圧力を変動させる圧力変動手段と、 吐出データに基づいて、複数の階調データから一の選択階調データを設定する階調データ設定手段と、 複数の吐出モードから設定される各選択吐出モードに基づいて互いに異なる吐出駆動信号を生成する駆動信号発生手段と、 選択階調データと前記吐出駆動信号とに基づいて、圧力変動手段の駆動波形を生成する駆動波形生成手段と、を備え、 各吐出駆動信号は、一液体噴射周期内に複数の波形要素を有する周期信号であり、 吐出モード毎に、同一の吐出データに基づいて生成される駆動波形が異なっており、 各駆動波形に基づいてノズル開口から吐出される液体の量は、同一の吐出データについて吐出モード毎に異なっていると共に、同一の吐出モードについて吐出データ毎に異なっていることを特徴とする液体噴射装置。
- 2圧力変動手段は、圧電振動子を有していることを特徴とする請求項1に記載の液体噴射装置。
- 3液体は、着色剤及び有機溶剤を含有していることを特徴とする請求項1または2に記載の液体噴射装置。
- 4前記着色剤の液体中における濃度は、0.1~10重量%であることを特徴とする請求項3に記載の液体噴射装置。
- 5前記着色剤は、顔料もしくは染料のいずれか一方を含んでいることを特徴とする請求項3または4に記載の液体噴射装置。
- 6前記着色剤は、粒径が20~250nmの顔料であることを特徴とする請求項3または4に記載の液体噴射装置。
- 7液体の粘度は、1~10cpsであることを特徴とする請求項1乃至6のいずれかに記載の液体噴射装置。
- 8液体の表面張力は、25~60mN/mであることを特徴とする請求項1乃至7のいずれかに記載の液体噴射装置。
- 9液体は、水を含有していることを特徴とする請求項1乃至8のいずれかに記載の液体噴射装置。
- 10ノズル開口を有するヘッド部材と、 ノズル開口部分の液体の圧力を変動させる圧力変動手段と、を備えた液体噴射装置を制御する制御装置であって、 吐出データに基づいて、複数の階調データから一の選択階調データを設定する階調データ設定手段と、 複数の吐出モードから設定される各選択吐出モードに基づいて互いに異なる吐出駆動信号を生成する駆動信号発生手段と、 選択階調データと前記吐出駆動信号とに基づいて、圧力変動手段の駆動波形を生成する駆動波形生成手段と、を備え、 各吐出駆動信号は、一液体噴射周期内に複数の波形要素を有する周期信号であり、 吐出モード毎に、同一の吐出データに基づいて生成される駆動波形が異なっており、 各駆動波形に基づいてノズル開口から吐出される液体の量は、同一の吐出データについて吐出モード毎に異なっていると共に、同一の吐出モードについて吐出データ毎に異なっていることを特徴とする制御装置。
- 11複数の吐出モードは、第1モードを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第1モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、少なくとも3以上のn個の分離した、ノズル開口から小液体滴を吐出させる小滴吐出用波形要素を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、1以上のp個の小滴吐出用波形要素を含む駆動波形を生成し、 選択階調データが中ドット用データである時、pより大のq個の小滴吐出用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、qより大のr個の小滴吐出用波形要素を含む駆動波形を生成するようになっていることを特徴とする請求項10に記載の制御装置。
- 12複数の吐出モードは、第1モードを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第1モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、3つの分離した、ノズル開口から小液体滴を吐出させる小ドット用波形要素を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、1つの小ドット用波形要素のみを含む駆動波形を生成し、 選択階調データが中ドット用データである時、2つの小ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、3つの小ドット用波形要素を含む駆動波形を生成するようになっていることを特徴とする請求項10に記載の制御装置。
- 13複数の吐出モードは、第2モードを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、小ドット用波形要素を含まない一方で中ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、小ドット用波形要素と中ドット用波形要素の両方を含む駆動波形を生成するようになっていることを特徴とする請求項10乃至12のいずれかに記載の制御装置。
- 14複数の吐出モードは、第2モードを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 前記中ドット用波形要素により吐出される液体滴と共に大液体滴を形成する第2液体滴を吐出させる大ドット用追加波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、中ドット用波形要素と大ドット用追加波形要素の両方を含む一方で小ドット用波形要素を含まない駆動波形を生成するようになっていることを特徴とする請求項10乃至12のいずれかに記載の制御装置。
- 15複数の吐出モードは、第1モードと第2モードとを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第1モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、少なくとも3以上のn個の分離した、ノズル開口から小液体滴を吐出させる小滴吐出用波形要素を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、1以上のp個の小滴吐出用波形要素を含む駆動波形を生成し、 選択階調データが中ドット用データである時、pより大のq個の小滴吐出用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、qより大のr個の小滴吐出用波形要素を含む駆動波形を生成するようになっており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、小ドット用波形要素を含まない一方で中ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、小ドット用波形要素と中ドット用波形要素の両方を含む駆動波形を生成するようになっており、 第2モードによる吐出は、第1モードによる吐出よりも、高質であることを特徴とする請求項10に記載の制御装置。
- 16複数の吐出モードは、第1モードと第2モードとを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第1モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、少なくとも3以上のn個の分離した、ノズル開口から小液体滴を吐出させる小滴吐出用波形要素を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、1以上のp個の小滴吐出用波形要素を含む駆動波形を生成し、 選択階調データが中ドット用データである時、pより大のq個の小滴吐出用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、qより大のr個の小滴吐出用波形要素を含む駆動波形を生成するようになっており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 前記中ドット用波形要素により吐出される液体滴と共に大液体滴を形成する第2液体滴を吐出させる大ドット用追加波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、中ドット用波形要素と大ドット用追加波形要素の両方を含む一方で小ドット用波形要素を含まない駆動波形を生成するようになっており、 第2モードによる吐出は、第1モードによる吐出よりも、高質であることを特徴とする請求項10に記載の制御装置。
- 17複数の吐出モードは、第1モードと第2モードとを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第1モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、3つの分離した、ノズル開口から小液体滴を吐出させる小ドット用波形要素を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、1つの小ドット用波形要素のみを含む駆動波形を生成し、 選択階調データが中ドット用データである時、2つの小ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、3つの小ドット用波形要素を含む駆動波形を生成するようになっており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、小ドット用波形要素を含まない一方で中ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、小ドット用波形要素と中ドット用波形要素の両方を含む駆動波形を生成するようになっており、 第2モードによる吐出は、第1モードによる吐出よりも、高質であることを特徴とする請求項10に記載の制御装置。
- 18複数の吐出モードは、第1モードと第2モードとを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第1モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、3つの分離した、ノズル開口から小液体滴を吐出させる小ドット用波形要素を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、1つの小ドット用波形要素のみを含む駆動波形を生成し、 選択階調データが中ドット用データである時、2つの小ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、3つの小ドット用波形要素を含む駆動波形を生成するようになっており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 前記中ドット用波形要素により吐出される液体滴と共に大液体滴を形成する第2液体滴を吐出させる大ドット用追加波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、中ドット用波形要素と大ドット用追加波形要素の両方を含む一方で小ドット用波形要素を含まない駆動波形を生成するようになっており、 第2モードによる吐出は、第1モードによる吐出よりも、高質であることを特徴とする請求項10に記載の制御装置。
- 19複数の吐出モードは、第3モードを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第3モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 ノズル開口から大液体滴を吐出させる大ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、大ドット用波形要素を含む一方で小ドット用波形要素及び中ドット用波形要素を含まない駆動波形を生成するようになっていることを特徴とする請求項10乃至18のいずれかに記載の制御装置。
- 20複数の吐出モードは、第2モードと第3モードとを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、小ドット用波形要素を含まない一方で中ドット用波形要素を含む駆動波形を生成し、 選択階調データが大ドット用データである時、小ドット用波形要素と中ドット用波形要素の両方を含む駆動波形を生成するようになっており、 第3モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 ノズル開口から大液体滴を吐出させる大ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、大ドット用波形要素を含む一方で小ドット用波形要素及び中ドット用波形要素を含まない駆動波形を生成するようになっており、 第3モードによる吐出は、第2モードによる吐出よりも、高質であることを特徴とする請求項10乃至12のいずれかに記載の制御装置。
- 21第2モードにおいて、 小ドット用波形要素によって吐出される液体量は、3~9pLであり、 中ドット用波形要素によって吐出される液体量は、9~15pLであり、 小ドット用波形要素及び中ドット用波形要素によって吐出される液体量は、17~30pLであり、 第3モードにおいて、 小ドット用波形要素によって吐出される液体量は、0.5~4pLであり、 中ドット用波形要素によって吐出される液体量は、5~10pLであり、 大ドット用波形要素によって吐出される液体量は、10~20pLであることを特徴とする請求項20に記載の制御装置。
- 22複数の吐出モードは、第2モードと第3モードとを含んでおり、 複数の階調データは、小ドット用データと、中ドット用データと、大ドット用データと、を有しており、 第2モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 前記中ドット用波形要素により吐出される液体滴と共に大液体滴を形成する第2液体滴を吐出させる大ドット用追加波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用追加波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、中ドット用波形要素と大ドット用追加波形要素の両方を含む一方で小ドット用波形要素を含まない駆動波形を生成するようになっており、 第3モードに基づいて生成される吐出駆動信号は、一液体噴射周期内において、 ノズル開口から小液体滴を吐出させる小ドット用波形要素と、 ノズル開口から中液体滴を吐出させる中ドット用波形要素と、 ノズル開口から大液体滴を吐出させる大ドット用波形要素と、を有する周期信号であり、 駆動波形生成手段は、前記吐出駆動信号に基づいて、 選択階調データが小ドット用データである時、小ドット用波形要素を含む一方で中ドット用波形要素及び大ドット用波形要素を含まない駆動波形を生成し、 選択階調データが中ドット用データである時、中ドット用波形要素を含む一方で小ドット用波形要素及び大ドット用波形要素を含まない駆動波形を生成し、 選択階調データが大ドット用データである時、大ドット用波形要素を含む一方で小ドット用波形要素及び中ドット用波形要素を含まない駆動波形を生成するようになっており、 第3モードによる吐出は、第2モードによる吐出よりも、高質であることを特徴とする請求項10乃至12のいずれかに記載の制御装置。
- 23第2モードにおいて、 小ドット用波形要素によって吐出される液体量は、3~9pLであり、 中ドット用波形要素によって吐出される液体量は、9~15pLであり、 中ドット用波形要素及び大ドット用追加波形要素によって吐出される液体量は、17~30pLであり、 第3モードにおいて、 小ドット用波形要素によって吐出される液体量は、0.5~4pLであり、 中ドット用波形要素によって吐出される液体量は、5~10pLであり、 大ドット用波形要素によって吐出される液体量は、10~20pLであることを特徴とする請求項22に記載の制御装置。
Independent claims23
218 paragraphs, as filed
The present invention relates to a liquid injection device that ejects liquid droplets from a nozzle opening, and in particular, a liquid injection capable of ejecting a plurality of types of liquid droplets having different liquid amounts from the same nozzle opening. Regarding the device.
[0002] In an inkjet recording device (a type of liquid injection device) such as an inkjet printer or an inkjet plotter, a recording head (head member) is moved along a main scanning direction and a recording paper (printing) is used. An image (character) is recorded on the recording paper by moving (a type of recording medium) along the sub-scanning direction and ejecting ink droplets from the nozzle opening of the recording head in conjunction with this movement. The ink droplets are discharged, for example, by expanding / contracting the pressure generating chamber communicating with the nozzle opening.
[0003] The expansion / contraction of the pressure generating chamber is performed by utilizing, for example, the deformation of the piezoelectric vibrator. In such a recording head, the piezoelectric vibrator is deformed according to the supplied drive pulse, which changes the volume of the pressure chamber, and this volume change causes pressure fluctuation in the ink in the pressure chamber, and the pressure fluctuates from the nozzle opening. Ink droplets are ejected.
[0004] In such a recording device, a drive signal formed by connecting a plurality of drive pulses in a series is generated. On the other hand, print data including gradation information is transmitted to the recording head. Then, based on the transmitted print data, only necessary drive pulses are selected from the drive signals and supplied to the piezoelectric vibrator. As a result, the amount of ink droplets ejected from the nozzle opening is changed according to the gradation information.
[0005] More specifically, for example, non-recorded print data (gradation information 00), small dot print data (gradation information 01), medium dot print data (gradation information 10), and large dots. In a printer in which four gradations consisting of dot print data (gradation information 11) are set, ink droplets having different ink amounts are ejected according to each gradation.
[0006] [Problems to be Solved by the Invention] By the way, recently, it is required to meet various demands of users with one inkjet recording device. For example, it is required that one inkjet recording device can perform a plurality of detailed requests such as recording with higher image quality and recording at higher speed while maintaining a certain level of image quality. There is.
[0007] Even in the conventional inkjet recording apparatus, the amount of ink to be ejected is changed according to the gradation information to meet the demand for improving the image quality. However, the number of gradation settings in the conventional inkjet recording device is small, and it is not sufficient to satisfy various demands.
[0008] If the number of bits of gradation information is uniformly increased in order to finely set the amount of ink, there arises a problem that the transmission time of print data to the recording head becomes long and the recording speed decreases.
[0009] Further, in order to increase the transfer clock of print data to shorten the data transfer time, it is necessary to use an element capable of high-frequency drive, which is new in terms of power consumption and cost increase. Problems arise.
[0010] The present invention has been made in consideration of such a point, and an inkjet recording capable of responding to various user demands by effectively using a relatively small number of gradation information. It is an object of the present invention to provide a device, broadly a liquid injection device.
[Means for Solving the Problems] The present invention provides a head member having a nozzle opening, a pressure fluctuating means for varying the pressure of ink in the nozzle opening, and a selective ejection mode from a plurality of ejection modes. Discharge mode setting means to be set, gradation data setting means to set one selected gradation data from a plurality of gradation data based on recorded data, and a drive signal to generate a discharge drive signal based on the selected discharge mode. The generation means, the drive pulse generation means for generating the drive pulse based on the selected gradation data and the discharge drive signal, and the control main body unit for driving the pressure fluctuation means based on the drive pulse are provided, and the discharge is provided. The liquid injection device is characterized in that the drive pulse generated based on the same gradation data is different for each mode.
[0012] According to the present invention, the discharge drive signal is generated based on the selective discharge mode, and the drive pulse is further generated based on the discharge drive signal and the selective gradation data based on the discharge data. Therefore, the drive pulse is generated. The mode of liquid discharge is controlled by the two factors of the discharge mode and the gradation data, and as a result, it becomes possible to meet the various demands of the user.
[0013] Preferably, the amount of liquid discharged from the nozzle opening based on each drive pulse is different for each discharge mode for the same selective gradation data, and for each gradation data for the same selective discharge mode. It's different.
[0014] Changing the amount of the discharged liquid in this way is extremely effective in controlling the discharge speed and the discharge image quality.
[0015] More specifically, for example, each discharge drive signal is a periodic signal having a plurality of pulse waveforms, and the drive pulse generation means generates a rectangular pulse train corresponding to one cycle of the discharge drive signal from each gradation data. However, a drive pulse is generated by ANDing the rectangular pulse train and the discharge drive signal. In this case, rapid signal processing can be realized.
[0016] Further, preferably, the plurality of ejection modes include the first mode, and the plurality of gradation data includes data for small dots, data for medium dots, and data for large dots. The discharge drive signal generated based on the first mode is a periodic signal having at least three or more n separated small liquid droplet pulse waveforms for ejecting small liquid droplets from the nozzle opening in one cycle. When the selected gradation data is small dot data, the drive pulse generating means uses only one or more p droplet pulse waveforms as drive pulses based on the discharge drive signal, and selects gradation. When the data is medium dot data, q small droplet pulse waveforms larger than p are used as drive pulses, and when the selected gradation data is large dot data, r larger than q and n or less. The pulse waveform for droplets is used as the drive pulse.
[0017] Particularly preferably, the plurality of ejection modes include the first mode, and the plurality of gradation data includes data for small dots, data for medium dots, and data for large dots. The discharge drive signal generated based on the first mode is a periodic signal having three separate pulse waveforms for small dots that discharge small liquid droplets from the nozzle opening in one cycle, and the drive pulse is generated. When the selected gradation data is small dot data, only one small dot pulse waveform is used as a drive pulse, and the selected gradation data is medium dot data, based on the discharge drive signal. The two small dot pulse waveforms are used as drive pulses, and when the selected gradation data is large dot data, all three small dot pulse waveforms are used as drive pulses.
[0018] Such a first mode is suitable for high-speed discharge.
[0019] Preferably, the plurality of ejection modes include a second mode, and the plurality of gradation data includes data for small dots, data for medium dots, and data for large dots. The discharge drive signal generated based on the second mode is for a pulse waveform for small dots that discharges small liquid droplets from the nozzle opening and for medium dots that discharge medium liquid droplets from the nozzle opening in one cycle. It is a periodic signal having a pulse waveform and a pulse waveform for large dots that ejects two or more liquid droplets from the nozzle opening, and the drive pulse generating means has a small selection gradation data based on the ejection drive signal. When it is dot data, the small dot pulse waveform is used as the drive pulse, and when the selected gradation data is medium dot data, the medium dot pulse waveform is used as the drive pulse, and the selected gradation data is large dot data. At one point, the large dot pulse waveform is used as the drive pulse.
[0020] Particularly preferably, the plurality of ejection modes include the second mode, and the plurality of gradation data includes data for small dots, data for medium dots, and data for large dots. The discharge drive signal generated based on the second mode is separated into a small dot pulse waveform for ejecting small liquid droplets from the nozzle opening and a small dot pulse waveform in one cycle, and the nozzle opening. It is a periodic signal having a medium dot pulse waveform for ejecting medium liquid droplets from the medium, and the drive pulse generating means is based on the discharge drive signal, and when the selected gradation data is the small dot data, the small dots When only the pulse waveform for drive is used as the drive pulse and the selected gradation data is data for medium dots, only the pulse waveform for medium dots is used as the drive pulse and when the selected gradation data is data for large dots, the pulse for small dots Both the waveform and the pulse waveform for medium dots are used as drive pulses.
[0021] Alternatively, the plurality of ejection modes include the second mode, and the plurality of gradation data includes data for small dots, data for medium dots, and data for large dots. The discharge drive signal generated based on the second mode is separated into a small dot pulse waveform for ejecting small liquid droplets from the nozzle opening and a small dot pulse waveform in one cycle, and is medium from the nozzle opening. A periodic signal having a pulse waveform for medium dots that ejects liquid droplets and an additional pulse waveform for large dots that ejects a second liquid droplet that forms a large liquid droplet together with the liquid droplets ejected by the pulse waveform for medium dots. When the selected gradation data is small dot data, the drive pulse generating means uses only the small dot pulse waveform as the driving pulse based on the discharge drive signal, and the selected gradation data is the medium dot data. When, only the medium dot pulse waveform is used as the drive pulse, and when the selected gradation data is the large dot data, both the medium dot pulse waveform and the large dot additional pulse waveform are used as the drive pulse. ing.
[0022] Such a second mode is suitable for medium-speed and high-precision discharge.
[0023] Alternatively, the plurality of ejection modes include a third mode, and the plurality of gradation data includes data for small dots, data for medium dots, and data for large dots. The discharge drive signal generated based on the third mode includes a pulse waveform for small dots that ejects small liquid droplets from the nozzle opening and a pulse waveform for medium dots that ejects medium liquid droplets from the nozzle opening in one cycle. , A periodic signal having a large dot pulse waveform for ejecting a large liquid drop from the nozzle opening, and the drive pulse generating means is based on the discharge drive signal when the selected gradation data is the small dot data. , When the pulse waveform for small dots is the drive pulse and the selected gradation data is the data for the middle dots, when the pulse waveform for the middle dots is the drive pulse and the selected gradation data is the data for the large dots, for the large dots The pulse waveform is used as the drive pulse.
[0024] Such a third mode is suitable for ultra-high precision discharge.
[0025] In addition, it is preferable that the pressure fluctuation means has a piezoelectric vibrator.
[0026] Also, the liquid can be an ink. In this case, the ink may contain a colorant and an organic solvent. In this case, the concentration of the colorant in the ink is preferably 0.1 to 10% by weight. Further, the colorant preferably contains either a pigment or a dye. Alternatively, the colorant is preferably a pigment having a particle size of 20 to 250 nm. The viscosity of the ink is preferably 1 to 10 cps, the surface tension of the ink is preferably 25 to 60 mN / m, and the ink preferably contains water.
[0027] Further, the present invention is a control device for controlling a liquid injection device including a head member having a nozzle opening and a pressure fluctuation means for varying the pressure of ink in the nozzle opening portion, and a plurality of ejections. Based on the discharge mode setting means for setting one selective discharge mode from the mode, the gradation data setting means for setting one selected gradation data from a plurality of gradation data based on the recorded data, and the selective discharge mode. A drive signal generating means for generating a discharge drive signal, a drive pulse generating means for generating a drive pulse based on the selected gradation data and the discharge drive signal, and a control for driving the pressure fluctuation means based on the drive pulse. It is a control device including a main body portion, and the drive pulse generated based on the same gradation data is different for each discharge mode.
[0028] Each element means of the control device or the control device can be realized by a computer system.
[0029] Further, a program for realizing each device or each means in a computer system and a computer-readable recording medium on which the program is recorded are also subject to the protection of this case.
[0030] Here, the recording medium includes not only a medium that can be recognized as a single unit such as a floppy disk, but also a network that propagates various signals.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view of an inkjet printer 1 which is a liquid injection device of the present embodiment. In the inkjet printer 1, the carriage 2 is movably attached to the guide member 3. The carriage 2 is connected to a timing belt 6 spanned between the drive pulley 4 and the idler pulley 5. The drive pulley 4 is joined to the rotating shaft of the pulse motor 7. With the above configuration, the carriage 2 is moved (main scan) in the width direction of the recording paper 8 by the drive of the pulse motor 7.
A recording head 10 (head member) is attached to a surface (lower surface) of the carriage 2 facing the recording paper 8.
As shown in FIG. 2, the recording head 10 has an ink chamber 12 to which ink from an ink cartridge 11 (see FIG. 1) is supplied, and a plurality of (for example, 64) nozzle openings 13 in the sub-scanning direction. It mainly includes a nozzle plate 14 arranged in a row and a plurality of pressure chambers 16 provided corresponding to each of the nozzle openings 13. The pressure chamber 16 expands and contracts due to the deformation of the piezoelectric vibrator 15.
[0035] The ink chamber 12 and the pressure chamber 16 are communicated with each other through the ink supply port 17 and the supply side communication hole 18. Further, the pressure chamber 16 and the nozzle opening 13 are communicated with each other through the first nozzle communication hole 19 and the second nozzle communication hole 20. That is, a series of ink flow paths from the ink chamber 12 to the nozzle opening 13 through the pressure chamber 16 are formed for each nozzle opening 13.
[0036] The nozzle plate 14 can be formed of the same material as a conventionally known nozzle plate substrate. For example, it is made of metal, ceramics, silicon, glass, plastic, or the like. Preferably, a single metal such as titanium, chromium, iron, cobalt, nickel, copper, zinc, tin, gold, or nickel-phosphorus alloy, tin-copper-phosphorus alloy (phosphorus bronze), copper-zinc alloy, stainless steel. It can be formed from alloys such as, polycarbonate, polysulfone, ABS resin (acrylic nitrile, butadiene, styrene copolymer), polyethylene terephthalate, polyacetal, or various photosensitive resins.
[0037] The nozzle plate 14 in the present embodiment is configured as an ink-repellent treated nozzle plate 14. The ink-repellent treated nozzle plate 14 has a uniformly formed ink-repellent film supported on the surface of the nozzle plate substrate. The ink-repellent treated nozzle plate 14 includes a plurality of nozzle openings 13 provided as through holes.
[0038] The nozzle opening 13 is opened on the outer surface of the nozzle plate 14 facing the recording paper 8 with a relatively small diameter, while being compared with the back side of the nozzle plate on the second nozzle communication hole 20 side. It is open with a large diameter. Therefore, the inner wall surface of the nozzle opening 13 has a funnel shape or a cone shape. The ink-repellent film is formed on at least the outer surface of the nozzle plate 14.
[0039] The above-mentioned piezoelectric vibrator 15 is a so-called deflection vibration mode piezoelectric vibrator 15. When the piezoelectric vibrator 15 in the flexible vibration mode is used, the piezoelectric vibrator 15 contracts in the direction orthogonal to the electric field due to charging, the pressure chamber 16 contracts, and the charged piezoelectric vibrator 15 is discharged to discharge the piezoelectric vibrator 15. The pressure chamber 16 expands as 15 extends in the direction orthogonal to the electric field.
That is, in the recording head 10, the capacity of the corresponding pressure chamber 16 changes as the piezoelectric vibrator 15 is charged and discharged. Ink droplets can be ejected from the nozzle opening 13 by utilizing the pressure fluctuation of the pressure chamber 16.
[0041] It is also possible to use a so-called longitudinal vibration mode piezoelectric vibrator instead of the above-mentioned deflection vibration mode piezoelectric vibrator 15. The piezoelectric vibrator in the longitudinal vibration mode is a piezoelectric vibrator that expands the pressure chamber by deformation due to charging and contracts the pressure chamber by deformation due to electric discharge.
[0042] The ink stored in the ink cartridge 11 is a dedicated ink for the ink-repellent nozzle plate 14.
[0043] Here, the ink will be described in detail. The ink can be water-based or organic, but is preferably water-based. The viscosity of this ink is preferably about 1 to 10 cps, more preferably about 2.5 to 6 cps.
[0044] In this ink, any colorant, that is, a dye, for example, a direct dye, an acid dye, an edible dye, a basic dye, a reactive dye, or the like can be used as the colorant. Alternatively, as the pigment, for example, an inorganic pigment and / or an organic pigment can be used.
[0045] As the above dye, a black dye, a yellow dye, a magenta dye, and a cyan dye are used.
[0046] Examples of the black dye include CIDirect B1ack 17, CIDirect B1ack 19, CIDirect Black62, CIDirect Brack 154, CIFood B1ack 2, CIReactive B1ack 5, CI Acid B1ack 52, CIProjet Fast Black 2, and the like.
[0047] Examples of the yellow dye include CIDirect Yellow 11, CIDirect Yellow 44, CIDirect Yellow 86, CIDirect Yellow 142, CIDirect Yellow 330, CIAcid Yellow 3, CIAcid Yellow 38, CIBasic Yellow 11, CIBasic Yellow 51, CISisperse Yellow 3, CIDisperse Yellow 5, CIReactive Yellow 2, etc. can be mentioned.
[0048] Examples of the magenta dye include CIDirect Red 227, CIDirect Red 23, CIAcid Red 18, CIAcid Red 52, CIBasic Red 14, CIBasic Red 39, CIDisperse Red 60 and the like.
[0049] Examples of the cyan dye include CIDirect B1ue 15, CIDirect B1ue 199, CIDirect B1ue 168, CIAcid Blue 9, CIAcid Blue 40, CIBasic Blue 41, CIAcid Blue 74, CIReactive Blue 15, and the like.
[0050] As the inorganic pigment, in addition to titanium oxide and iron oxide, carbon black produced by a known method such as a contact method, a furnest method, or a thermal method can be used.
[0051] Examples of the organic pigment include azo pigments (including azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments, etc.), polycyclic pigments (for example, phthalocyanine pigments, verylene pigments, verinone pigments, anthraquinone pigments, etc.). Use quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelate (for example, basic dye type chelate, acidic dye type chelate, etc.), nitro pigment, nitroso pigment, aniline black, etc. be able to.
[0052] As a specific example, as a yellow pigment, CI pigment yellow 74, 109, 110, 138, as a magenta pigment, CI pigment red 122, 202, 209, as a cyan pigment, CL pigment blue 15: 3, 60, black pigment. As the CI pigment black 7, CI pigment orange 36, 43 as the orange pigment, CI pigment green 7, 36 and the like as the green pigment can be used.
[0053] With respect to the above-mentioned colorant, the concentration of this colorant in the ink is preferably 0.1 to 10% by weight.
[0054] Further, the particle size of the pigment preferably has a cumulative average diameter of 20 nm to 250 nm, and more preferably 50 nm to 200 nm.
[0055] Hereinafter, pigment inks will be described, but unless otherwise specified in the following description, those descriptions also apply to dye inks.
[0056] As the preferred dispersant, a known dispersant used for preparing a conventionally known pigment dispersion, for example, a polymer dispersant or a surfactant can be used.
[0057] Examples of polymeric dispersants include natural polymeric compounds such as proteins such as sardines, gelatin, gazein, albumin; natural rubbers such as arabic rubber, traganth rubber; glucosides such as savonin; alginic acid and alginic acid. Alginic acid derivatives such as provirene glycol ester, triethanolamine alginate, ammonium alginate; cellulosic derivatives such as methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose and the like can be mentioned.
[0058] Further, a synthetic polymer compound can be used as the polymer dispersant. Examples of synthetic polymer compounds include polyvinyl alcohols; polyvinylpyrrolidones; polyacrylic acid, acrylic acid-acrylonitrile copolymer, potassium acrylate-acrylonitrile copolymer, vinyl acetate-acrylic acid ester copolymer, and acrylic acid. -Acrylic resins such as acrylic acid alkyl ester copolymers; styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, styrene-acrylic acid acrylic acid alkyl ester copolymers, styrene-α-methylstyrene-acrylic Styrene-acrylic acid resins such as acid copolymers, styrene-α-methylstyrene-acrylic acid-alkyl ester copolymers; styrene-maleic acid; styrene-maleic anhydride; vinylnaphthalene-acrylic acid copolymers; Vinylnaphthalene-maleic acid copolymer; vinyl acetate-ethylene copolymer, vinyl acetate-fatty acid vinylethylene copolymer, vinyl acetate maleic acid ester copolymer, vinyl chloride crotonic acid copolymer, vinyl acetate acrylic acid copolymer Examples thereof include vinyl acetate-based copolymers such as coalesses and salts thereof.
[0059] Among these, a polymer composed of a monomer having a hydrophobic group and a monomer having a hydrophilic group, and a polymer composed of a monomer having both a hydrophobic group and a hydrophilic group are particularly preferable.
[0060] Examples of the above salts include salts with diethylamine, ammonia, ethylamine, triethylamine, propylamine, isopropylamine, dipropylamine, butylamine, isobutylamine, triethanolamine, diethanolamine, aminomethylpropanol, morpholine and the like. Can be done. The weight average molecular weight of these copolymers is preferably 3,000 to 30,000, more preferably 5,000 to 15,000.
[0061] Examples of preferable surfactants as dispersants include fatty acid salts, higher alkyl dicarboxylates, higher alcohol sulfate esters, higher alkyl sulfonates, condensates of higher fatty acids and amino acids, and sulfoanodic acid esters. Anionic surfactants such as salts, naphthenates, liquid fatty oil sulfates, alkylallyl sulfonates; cationic surfactants such as fatty acid amine salts, tetraammonium salts, sulfonium salts, phosphoniums; polyoxyethylene alkyl Nonionic surfactants such as ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, and polyoxyethylene sorbitan alkyl esters can be mentioned. The surface tension of the ink is preferably 25 to 60 mN / m, more preferably 28 to 40 mN / m.
[0062] The amount of these dispersants added is preferably in the range of 0.06 to 3% by weight, more preferably in the range of 0.125 to 3% by weight, based on the pigment 1.
[0063] Further, it is preferable that this ink further contains a wetting agent. Preferred examples of wetting agents are diethylene glycol, polyethylene glycol, polypropylene glycol, ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2,6-hexanetriol, thioglycol, hexylene glycol, glycerin, trimethylolethane. , Trimethylolpropane, urea, 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone and the like, and those having an ethylene oxide group are particularly preferable, and diethylene glycol is most preferable. Further, in addition to these wetting agents, it is preferable to further add a low boiling point organic solvent.
[0064] Preferred examples of low boiling organic solvents are methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, tert-butanol, iso-butanol, n-pentanol, ethylene glycol monomethyl ether. , Ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethylene glycol moyethyl ether and the like. In particular, monohydric alcohol is preferable.
[0065] The amount of these wetting agents added is preferably in the range of 0.5 to 40% by weight, preferably 2 to 20% by weight of the ink. The amount of the low boiling point organic solvent added is preferably in the range of 0.5 to 10% by weight, preferably 1.5 to 6% by weight of the ink.
[0066] In addition, the ink may contain a surfactant. Examples of preferred surfactants are anionic surfactants (eg sodium dodecylbenzel sulfonate, sodium laurylate, ammonium salts of polyoxyethylene alkyl ether sulfates, etc.), nonionic surfactants (eg, polyoxyethylene). Alkyl ethers, polyoxyethylene alkyl esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl phenyl ethers, polyoxyethylene alkyl amines, polyoxyethylene alkyl amides, etc.) can be mentioned, and these may be used alone or in combination of two or more. Can be used. It is also possible to use acetylene glycol [olefin Y and surfinol 82, 104, 440, 465, 485, and TG (all manufactured by Air Products and Chemicals Inc.)] -based surfactants.
[0067] In addition, if necessary, a pH adjuster, a preservative, and / or an antifungal agent and the like may be contained in the ink.
[0068] Note that this ink can be produced by dispersing and mixing the above components by an appropriate method.
[0069] Preferably, the mixture excluding the organic solvent and volatile components is mixed with a suitable disperser (eg, ball mill, sand mill, attritor, roll mill, agitator mill, Henschel Mickey, Coroited mill, ultrasonic homogenizer, jet mill, ong mill). Etc.) to make a homogeneous composition, and then add the organic solvent and volatile components. Then, in order to remove coarse particles and foreign substances that cause clogging, filtration (preferably reduced pressure or pressure filtration using a metal filter, membrane filter, etc.) or centrifugation is performed.
[0070] Now, the printer 1 configured as described above ejects the above-mentioned ink as ink droplets from the recording head 10 in synchronization with the main scan of the carriage 2 during the recording operation. On the other hand, the platen is rotated in conjunction with the reciprocating movement of the carriage 2 to move the recording paper 8 in the paper feed direction (that is, sub-scanning). As a result, images, characters, and the like based on the recorded data are recorded on the recording paper 8.
Next, the electrical configuration of the inkjet printer will be described. As shown in FIG. 3, the printer 1 includes a printer controller 23 and a print engine 24.
[0072] The printer controller 23 includes a control unit 28 including an external interface (external I / F) 25, a RAM 26 for temporarily storing various data, a ROM 27 for storing a control program, and the like, and a CPU and the like. Based on the oscillation circuit 29 that generates the clock signal (CK), the drive signal generation circuit 30 that generates the drive signal (COM) to supply to the recording head 10, and the drive signal and print data (recorded data). It is equipped with an internal interface (internal I / F) 31 that transmits the expanded dot pattern data (bitmap data) and the like to the print engine 24.
[0073] The external I / F 25 receives, for example, print data composed of a character code, a graphic function, an image data, or the like from a host computer or the like (not shown). In addition, a busy signal (BUSY) and an acknowledge signal (ACK) are output to a host computer or the like through an external I / F25.
Further, the external I / F 25 of the present embodiment functions as an image quality mode setting means for setting an image quality mode (ejection mode) related to recording accuracy on the recording paper 8 (recording medium) according to the present embodiment. , Is connected to an interface device 100 such as a keyboard.
[0075] The RAM 26 has a receive buffer, an intermediate buffer, an output buffer, and a work memory (not shown). Then, the receive buffer temporarily stores the print data received via the external I / F25, the intermediate buffer stores the intermediate code data converted by the control unit 28, and the output buffer is the dot pattern data. Remember. Here, the dot pattern data is print data obtained by decoding (translating) intermediate code data (for example, gradation data).
[0076] In the ROM 27, font data, graphic functions, and the like are stored in addition to a control program (control routine) for performing various data processing.
[0077] The control unit 28 performs various controls according to the control program stored in the ROM 27. For example, the print data in the reception buffer is read and the print data is converted into intermediate code data, and the intermediate code data is stored in the intermediate buffer. Further, the control unit 28 analyzes the intermediate code data read from the intermediate buffer, refers to the font data, the graphic function, and the like stored in the ROM 27, and develops (decodes) the intermediate code data into dot pattern data. Then, the control unit 28 stores the dot pattern data in the output buffer after performing the necessary decoration processing. Each dot pattern data is composed of 2-bit data in this case as gradation information. That is, the control unit 28 functions as a gradation data setting means.
[0078] If the dot pattern data for one line that can be recorded is obtained by one main scan of the recording head 10, the dot pattern data for the one line is sequentially recorded from the output buffer through the internal I / F 31. Output to head 10. When the dot pattern data for one line is output from the output buffer, the expanded intermediate code data is deleted from the intermediate buffer, and the next intermediate code data is expanded.
[0079] Further, the control unit 28 constitutes a part of the timing signal generating means, and supplies the latch signal (LAT) and the channel signal (CH) to the recording head 10 through the internal I / F 31. These latch signals and channel signals define the supply start timing of the pulse signals constituting the drive signal (COM).
[0080] On the other hand, the print engine 24 includes a paper feed motor 35 as a paper feed mechanism, a pulse motor 7 as a carriage feed mechanism, and an electric drive system 33 of the recording head 10. The paper feed motor 35 rotates the platen 34 (see FIG. 1) to move the recording paper 8, and the pulse motor 7 travels the carriage 2 via the timing belt 6.
As shown in FIG. 3, the electric drive system 33 of the recording head 10 is composed of a shift register circuit including a first shift register 36 and a second shift register 37, and a first latch circuit 39 and a second latch circuit 40. It is equipped with a latch circuit, a decoder 42, a control logic 43, a level shifter 44, a switch circuit 45, and a piezoelectric vibrator 15.
As shown in FIG. 4, each of these shift registers, each latch circuit, a decoder, a switch circuit, and a piezoelectric vibrator are provided with the first shift register 36A to each of the nozzle openings 13 of the recording head 10. It is composed of 36N, a second shift register 37A to 37N, a first latch circuit 39A to 39N, a second latch circuit 40A to 40N, a tecoder 42A to 42N, a switch circuit 45A to 45N, and a piezoelectric vibrator 15A to 15N.
[0083] With such an electric drive system 33, the recording head 10 ejects ink droplets based on print data (gradation information) from the printer controller 23. The print data (SI) from the print controller 23 is serially transmitted from the internal I / F 31 to the first shift register 36 and the second shift register 37 in synchronization with the clock signal (CK) from the oscillation circuit 29.
[0084] The print data from the printer controller 23 is 2-bit data as described above. Specifically, for 4 gradations consisting of non-recording, small dots, medium dots, and large dots, non-recording is (00), small dots are (01), and medium dots are (10). The large dot is represented by (11).
[0085] Such print data is set for each dot, that is, for each nozzle opening 13. Then, the low-order bit data for all nozzle openings 13 is input to the first shift register 36 (36A to 36N), and the high-order bit data for all nozzle openings 13 is input to the second shift register 37 (37A to 37N). Will be done.
As shown in FIG. 3, a first latch circuit 39 is electrically connected to the first shift register 36. Similarly, a second latch circuit 40 is electrically connected to the second shift register 37. Then, when the latch signal (LAT) from the print controller 23 is input to each of the latch circuits 39 and 40, the first latch circuit 39 latches the data of the lower bits of the print data, and the second latch circuit 40 latches the print data. Latch the high-order bit of.
[0087] As described above, the circuit unit including the first shift register 36 and the first latch circuit 39 and the circuit unit including the second shift register 37 and the second latch circuit 40 each function as a storage circuit. That is, these circuit units temporarily store the print data (gradation information) before being input to the decoder 42.
The print data latched by the latch circuits 39 and 40 are input to the decoders 42A to 42N. The decoder 42 translates 2-bit print data (gradation data) to generate pulse selection data (pulse selection information). The pulse selection data is composed of a plurality of bits equal to or greater than the gradation data, and each bit corresponds to each pulse waveform constituting the drive signal (COM). Then, supply / non-supply of the drive pulse waveform to the piezoelectric vibrator 15 is selected according to the content of each bit (for example, (0), (1)). Details of the supply of the drive signal (COM) and the drive pulse waveform will be described later.
On the other hand, a timing signal from the control logic 43 is also input to the decoder 42. The control logic 43 functions as a timing signal generating means together with the control unit 28, and generates a timing signal based on the latch signal (LAT) and the channel signal (CH).
The pulse selection data translated by the decoder 42 is input to the level shifter 44 in order from the high-order bit side each time the timing defined by the timing signal arrives. For example, at the first timing in the recording cycle, the data of the most significant bit of the pulse selection data is input to the level shifter 44, and at the second timing, the data of the second bit of the pulse selection data is input to the level shifter 44.
The level shifter 44 functions as a voltage amplifier, and when the pulse selection data is 1, outputs an electric signal boosted to a voltage capable of driving the switch circuit 45, for example, a voltage of about several tens of volts.
[0092] The pulse selection data of "1" boosted by the level shifter 44 is supplied to the switch circuit 45 that functions as the drive pulse generation means and the control main body unit. The switch circuit 45 selects a drive pulse included in the drive signal (COM) to generate a drive pulse based on the pulse selection data generated by translating the print data, and transfers the drive pulse to the piezoelectric vibrator 15. It is to supply. Therefore, the drive signal (COM) from the drive signal generation circuit 30 is supplied to the input side of the switch circuit 45, and the piezoelectric vibrator 15 is connected to the output side thereof.
The pulse selection data controls the operation of the switch circuit 45. For example, during the period when the pulse selection data applied to the switch circuit 45 is "1", the switch circuit 45 is in the connected state, and the drive pulse of the drive signal is supplied to the piezoelectric vibrator 15. As a result, the potential level of the piezoelectric vibrator 15 changes.
On the other hand, during the period when the pulse selection data applied to the switch circuit 45 is 0, the electric signal for operating the switch circuit 45 is not output from the level shifter 44. Therefore, the switch circuit 45 is disconnected, and the drive pulse of the drive signal is not supplied to the piezoelectric vibrator 15. During the period when the pulse selection data is "0", the piezoelectric vibrator 15 maintains the potential level immediately before the pulse selection data is switched to "0".
Next, the drive signal (COM) generated by the drive signal generation circuit 30 and the ink droplet ejection control by the drive signal will be described in detail. The drive signal generation circuit 30 has a plurality of types of drives in which the amount of ink ejected differs depending on the set image quality mode (first mode to third mode) even if the print data (gradation information) is the same. It is designed to generate a signal.
[0096] To explain each image quality mode relatively, the first mode is a high-speed low-quality image recording mode, the second mode is a medium-speed medium-quality image mode, and the third mode is a low-speed high-quality image mode. is there.
[0097] FIG. 5 is a diagram showing a drive signal of the first mode, FIG. 6 is a diagram illustrating a drive pulse in the drive signal of the first mode, FIG. 7 is a diagram showing a drive signal of the second mode, and FIG. FIG. 9 is a diagram for explaining the drive pulse in the drive signal of the second mode, FIG. 9 is a diagram showing the drive signal of the third mode, and FIG. 10 is a diagram for explaining the drive pulse in the drive signal of the third mode.
[0098] First, the drive signal A defined in the first mode is shown in FIG. As shown in FIG. 5, the drive signal A includes the first pulse signal PS21 arranged in the period T1, the second pulse signal PS22 arranged in the period T2, and the third pulse signal PS23 arranged in the period T3. Is a pulse train waveform signal that is repeatedly generated in the recording cycle TC. In this case, the frequency of the recording period TC is 8.57 × 3 kHz. In the drive signal A, the first pulse signal PS21 is the first drive pulse DP6, the second pulse signal PS22 is the second drive pulse DP7, and the third pulse signal PS23 is the third drive pulse DP8.
[0099] The first drive pulse DP6, the second drive pulse DP7, and the third drive pulse DP8 all have the same waveform shape, and are signals capable of ejecting ink droplets independently.
That is, each drive pulse DP6, DP7, DP8 has a first discharge element P51 that lowers the potential from the intermediate potential VM to the lowest potential VL along the gradient θ31, and a first that maintains this lowest potential VL for a short time. The hold element P52, the first charging element P53 that raises the potential from the lowest potential VL to the highest potential VH along the steep slope θ32 in a very short time, the second hold element P54 that maintains the highest potential, and the highest potential VH. It is composed of a second discharge element P55 that lowers the potential from to to the intermediate potential VM along the gradient θ33.
[0101] When each of these drive pulses is supplied to the piezoelectric vibrator 15, an amount of ink droplets capable of forming small dots is ejected from the nozzle opening 13.
[0102] More specifically, the volume of the pressure generating chamber 16 expands from the reference volume to the maximum volume when the first discharge element P51 is supplied and the piezoelectric vibrator 15 is discharged from the intermediate potential VM. Then, the pressure generating chamber 16 rapidly contracts to the minimum volume by the first charging element P53. The contracted state of the pressure generating chamber 16 is maintained for the period during which the second hold element P54 is supplied. Due to the rapid contraction of the pressure generating chamber 16 and the holding of the contracted state, the ink pressure in the pressure generating chamber 16 rapidly increases, and ink droplets are ejected from the nozzle opening 13. The amount of ink droplets ejected at this time is, for example, about 13 pL. Then, the pressure generating chamber 16 is expanded and restored by the second discharge element P55 in order to converge the vibration of the meniscus in a short time.
[0103] In this first mode, as shown in FIG. 6, gradation control can be performed by increasing or decreasing the number of drive pulses supplied to the piezoelectric vibrator 15. For example, supplying one drive pulse to record small dots, supplying two drive pulses to record medium dots, and supplying three drive pulses to record large dots. Can be done.
Next, the drive signal B defined in the second mode is shown in FIG. As shown in FIG. 7, the drive signal B connects the first pulse signal PS1 arranged in the period T1 and the second pulse signal PS2 arranged in the period T2 after the period T1 in a series. This is a pulse train waveform signal that is repeatedly generated in the print cycle TA. In the drive signal B, the first pulse signal PS1 is a small dot drive pulse DP1 (first small dot drive pulse) that ejects small ink droplets from the nozzle opening 13, and the second pulse signal PS2 is medium ink from the nozzle opening 13. It is a medium dot drive pulse DP2 (first medium dot drive pulse) that ejects drops.
[0105] The first pulse signal PS1 (small dot drive pulse DP1) determines the first charging element P1 that raises the potential along the potential gradient θ1 set relatively gently from the intermediate potential VM, and the maximum potential VH. The first hold element P2 that maintains the time, the first discharge element P3 that lowers the potential from the maximum potential VH to the minimum potential VL with a predetermined potential gradient θ2, and the second hold element P4 that maintains the minimum potential VL for a short time. The second charging element P5 that raises the potential from the lowest potential VL to the highest potential VH in a very short time along the potential gradient θ3 set to a steep slope, and the third hold element P6 that maintains the highest potential VH for a very short time. The second discharge element P7, which lowers the potential from the highest potential to the second intermediate potential VM2 set between the intermediate potential VM and the lowest potential VL along the gradient θ4 in a very short time, and the second intermediate potential VM2. It is composed of a fourth holding element P8 that maintains the above for a predetermined time, and a third charging element P9 that raises the potential along the potential gradient θ5 and returns it to the intermediate potential VM.
[0106] In the first pulse signal PS1, the potential gradients θ1, θ2, and θ5 are set to such a gradient that ink droplets are not ejected.
[0107] The second pulse signal PS2 (medium dot drive pulse DP2) has a third discharge element P11 that lowers the potential with a constant gradient θ6 that does not eject ink droplets from the intermediate potential VM to the lowest potential VL, and the lowest potential VL. The fifth hold element P12 that holds the maximum potential VH for a predetermined time, the fourth charging element P13 that raises the potential from the lowest potential VL to the highest potential VH with a steep gradient θ7, and the sixth hold element P14 that holds the highest potential VH for a predetermined time. It is composed of a fourth discharge element P15 that lowers the potential from the highest potential VH to the intermediate potential VM.
Although not adopted in the drive signal B of the present embodiment, a micro-vibration pulse for micro-vibration in printing may be formed between the first pulse signal PS1 and the second pulse signal PS2. ..
[0109] When the first pulse signal PS1 portion of the discharge drive signal B as described above is supplied to the piezoelectric vibrator 15, small ink droplets capable of forming small dots are discharged from the nozzle opening 13.
[0110] More specifically, the volume of the pressure generating chamber 16 corresponds to the reference volume (corresponding to the intermediate potential VM) by supplying the first charging element P1 and charging the piezoelectric vibrator 15 from the intermediate potential VM. Volume) gradually decreases. Then, the pressure generating chamber 16 maintains the minimum volume corresponding to the maximum potential VH for a predetermined time by the first hold element P2. After that, the pressure generating chamber 16 is expanded to the maximum volume corresponding to the minimum potential VL by the first discharge element P3.
Subsequently, the pressure generating chamber 16 is rapidly contracted from the maximum volume to the minimum volume by the second charging element P5. Due to this shrinkage, the ink pressure in the pressure generating chamber 16 increases, and ink droplets are ejected from the nozzle opening 13. Since the supply time of the second charging element P5 is set to be extremely short, the pressure generating chamber 16 is immediately expanded by the second discharging element P7. As a result, the amount of ink droplets ejected from the nozzle opening 13 is limited to a small amount of, for example, 3 to 9 pL.
[0112] Then, the volume of the pressure generating chamber 16 corresponding to the second intermediate potential VM2 is maintained for a predetermined time by the fourth hold element P8, and the pressure generating chamber is set to converge the vibration of the meniscus in a short time by the third charging element P9. Shrink 16
[0113] On the other hand, when the second pulse signal PS2 portion is supplied to the piezoelectric vibrator 15, the middle ink droplet corresponding to the middle dot is ejected from the nozzle opening 13.
[0114] More specifically, when the third discharge element P11 is supplied and the piezoelectric vibrator 15 is discharged from the intermediate potential VM, the volume of the pressure generating chamber 16 gradually expands from the reference volume. Then, by the fifth hold element P12, the pressure generating chamber 16 maintains the maximum volume corresponding to the minimum potential VL for a short time. After that, the pressure generating chamber 16 rapidly contracts to the minimum volume corresponding to the maximum potential VH by the fourth charging element P13. Due to this shrinkage, the ink pressure in the pressure generating chamber 16 increases, and ink droplets are ejected from the nozzle opening 13. Here, the state of the minimum volume is maintained for a predetermined time by the sixth hold element P14. As a result, the amount of ink droplets ejected from the nozzle opening 13 becomes, for example, 9 to 15 pL. Subsequently, the fourth discharge element P15 expands and restores the pressure generating chamber 16 to the reference volume in order to converge the vibration of the meniscus in a short time.
[0115] In this recording mode, as will be described later with reference to FIG. 8, large dots can be recorded by supplying the first pulse signal PS1 and the second pulse signal PS2 in combination.
[0116] The drive signal B as described above has only two types of pulse signals constituting the drive signal: the first pulse signal PS1 (small dot drive pulse DP1) and the second pulse signal PS2 (medium dot drive pulse DP2). Therefore, the print cycle TA can be set relatively short. As a result, the time required to record one dot can be shortened, and fast recording can be performed while maintaining high image quality.
Next, the drive signal C defined in the third mode is shown in FIG. As shown in FIG. 9, the drive signal C includes the first pulse signal PS11 arranged in the period T1, the second pulse signal PS12 arranged in the period T2, and the first connection element CP1 arranged in the period TS1. , The third pulse signal PS13 arranged in the period T3, the fourth pulse signal PS14 arranged in the period T4, the fifth pulse signal PS15 arranged in the period T5, and the second connection element arranged in the period TS2. CP2, the 6th pulse signal PS16 arranged in the period T6, the 3rd connection element CP3 arranged in the period TS3, and the 7th pulse signal PS17 arranged in the period T7 are connected in a series. It is a pulse train waveform signal that is repeatedly generated in the print cycle TB. The connection elements CP1, CP2, and CP3 are waveform elements that connect different potential levels of the pulse signals located on both sides, and are not supplied to the piezoelectric vibrator 15.
As shown in FIG. 9, in the drive signal C, the first pulse signal PS11 is a micro-vibration pulse for causing micro-vibration in printing. The second pulse signal PS12 is a signal that constitutes a part of the small dot drive pulse DP3 that ejects small ink droplets from the nozzle opening 13. The third pulse signal PS13 is a medium dot drive pulse DP4 that ejects medium ink droplets from the nozzle opening 13. The fourth pulse signal PS14 is a signal that constitutes a part of a large tot drive pulse DP5 that ejects a large ink droplet from the nozzle opening 13 or a part of a micro-vibration pulse. The fifth pulse signal PS15 is a signal paired with the fourth pulse signal PS14 to form a micro-vibration pulse. The sixth pulse signal PS16 is a signal paired with the second pulse signal PS12 to form a small dot drive pulse DP3. The 7th pulse signal PS17 is a signal paired with the 4th pulse signal PS14 to form a large dot drive pulse DP5.
That is, as shown in FIG. 10, a small dot drive pulse DP3 (second small dot drive pulse) is generated by extracting the second pulse signal PS12 and the sixth pulse signal PS16 from the drive signal C. Will be done. Similarly, by extracting the third pulse signal PS13 from the drive signal C, a middle dot drive pulse DP4 (second middle dot drive pulse) is generated to drive the fourth pulse signal PS14 and the seventh pulse signal PS17. By extracting from the signal C, a large dot drive pulse DP5 is generated.
Although not shown, the in-print micro-vibration pulse is generated by extracting the first pulse signal PS11 and / or the fourth pulse signal PS14 and the fifth pulse signal PS15 from the drive signal C.
As shown in FIGS. 9 and 10, the small dot drive pulse DP3 has a first charging element P21 that raises the potential along a relatively gently set gradient θ11 from the intermediate potential VM, and a maximum potential VH. The first hold element P22, which maintains the potential for a relatively long period of time, the first discharge element P23, which lowers the potential from the maximum potential VH to the minimum potential VL along a steep θ12, and the minimum potential VL are maintained for a short time. The second holding element P24, the second charging element P25 that raises the potential from the lowest potential VL along the steep θ13 to the second highest potential VH2 set between the intermediate potential VM and the highest potential VH, and the second 2 The third hold element P26 that maintains the maximum potential VH2 for a very short time, the second discharge element P27 that lowers the potential along the steep θ14 from the second maximum potential VH2 to the second intermediate potential VM2, and the second. The potential is raised from the second intermediate potential VM2 along the steep θ15 to the fourth hold element P28, which maintains the intermediate potential VM2 for a very short time, and the third maximum potential VH3, which is slightly lower than the second maximum potential VH2. It is composed of a third charging element P29, a fifth holding element P30 that maintains the third maximum potential VH3 for a short time, and a third discharging element P31 that lowers the potential from the third maximum potential VH3 to an intermediate potential along a gradient θ16. Will be done.
[0122] When the small dot drive pulse DP3 is supplied to the piezoelectric vibrator 15, small ink droplets are ejected from the nozzle opening 13.
[0123] More specifically, when the first charging element P21 is supplied and the piezoelectric vibrator 15 is charged from the intermediate potential VM, the pressure generating chamber 16 gradually contracts from the reference volume to the minimum volume. Become. Subsequently, the pressure generating chamber 16 maintains the minimum volume by the first hold element P22. After that, the pressure generating chamber 16 is rapidly expanded by the first discharge element P23, contracted again by the second charging element P25, and expanded again by the second discharge element P27. The ink pressure in the pressure generating chamber 16 changes with this series of expansion and contraction, and ink droplets having an ink amount of about 0.5 to 4 pL are ejected from the nozzle opening 13. Subsequently, the third charging element P29, the fifth hold element P30, and the third discharging element P31 are supplied in this order. As a result, the pressure generating chamber 16 contracts and returns to expansion in order to converge the vibration of the meniscus due to ink ejection in a short time.
[0124] The medium dot drive pulse DP4 has a fourth discharge element P32 that lowers the potential from the intermediate potential VM to the lowest potential VL along the gradient θ17, a sixth hold element P33 that maintains the lowest potential VL, and the lowest potential VL. From the 4th charging element P34 that raises the potential along the steep θ18 from the 2nd maximum potential VH2, the 7th hold element P35 that maintains the 2nd maximum potential VH2 for a very short time, and the 2nd maximum potential VH2 The fifth discharge element P36, which lowers the potential along the steep θ19 to the second intermediate potential VM2, the eighth hold element P37, which maintains the second intermediate potential VM2 for a very short time, and the second intermediate potential VM2 to the second. 3 The fifth charging element P38 that raises the potential along the steep θ20 up to the maximum potential VH3, the ninth hold element P39 that maintains the third maximum potential VH3 for a short time, and the gradient from the third maximum potential VH3 to the intermediate potential. It is composed of a sixth discharge element P40 that lowers the potential along θ21.
[0125] When the medium dot drive pulse DP4 is supplied to the piezoelectric vibrator 15, medium ink droplets are discharged from the nozzle opening 13.
[0126] More specifically, by supplying the fourth discharge element P32, the pressure generating chamber 16 expands from the reference volume to reach the maximum volume. After that, the pressure generating chamber 16 contracts by the fourth charging element P34 and expands again by the fifth discharging element P36. The ink pressure in the pressure generating chamber 16 changes with this series of expansion and contraction, and medium ink droplets having an ink amount of about 5 to 10 pL are ejected from the nozzle opening 13. Subsequently, the fifth charging element P38, the ninth hold element P39, and the sixth discharging element P40 are supplied in this order. As a result, the pressure generating chamber 16 contracts and returns to expansion in order to converge the vibration of the meniscus due to ink ejection in a short time.
The large dot drive pulse DP5 includes a seventh discharge element P41 that lowers the potential from the intermediate potential along the gradient θ22 to the third intermediate potential VM3 set between the intermediate potential VM and the second intermediate potential. The tenth hold element P42 that maintains the third intermediate potential VM3 for a relatively long time, the eighth discharge element P43 that lowers the potential from the third intermediate potential VM3 to the lowest potential along the gradient θ23, and the lowest potential VL. The eleventh holding element P44 that maintains the potential for a predetermined time, the sixth charging element P45 that raises the potential along the steep gradient θ24 from the lowest potential VL to the second highest potential VH2, and the second highest potential VH2 that is maintained for a predetermined time. It is composed of a 12-hold element P46 and a ninth discharge element P47 that lowers the potential from the second maximum potential VH2 to the intermediate potential VM with a gradient θ25.
[0128] When the large dot drive pulse DP5 is supplied to the piezoelectric vibrator 15, large ink droplets are ejected from the nozzle opening 13.
[0129] More specifically, by supplying the seventh discharge element P41, the pressure generating chamber 16 is in a state of being slightly expanded from the reference volume. This slightly inflated state is maintained by the supply of the tenth hold element P42. After that, the pressure generating chamber 16 is expanded to the maximum volume by the eighth discharge element P43, and the state of the maximum volume is maintained for a short time by the eleventh hold element P44. Then, the pressure generating chamber 16 is rapidly contracted by the sixth charging element P45, and this contracted state is maintained for a short time by the 12th hold element P46. By supplying these 6th charging element P45 and 12th hold element P46, the ink pressure in the pressure generating chamber 16 rapidly increases, and the contracted state of the pressure generating chamber 16 is maintained for a predetermined time. As a result, large ink droplets having an ink amount of about 10 to 20 pL are ejected from the nozzle opening 13. After that, the ninth discharge element P47 is supplied, and the pressure generating chamber 16 returns to expansion in order to converge the vibration of the meniscus due to ink ejection in a short time.
[0130] As described above, the drive signal C includes the small dot drive pulse DP3, the medium dot drive pulse DP4, and the large dot drive pulse DP5. Then, in this drive signal C, since the potential gradient, supply time, and the like of the waveform elements constituting the drive pulse can be set for each element, the waveform shape of the drive pulse can be relatively freely configured. Therefore, it is easy to change the amount of ink for each drive pulse. As a result, the size of each type of dot can be finely controlled, and higher image quality can be recorded.
[0131] Here, in the present embodiment, small dot dot pattern data (gradation information 01), medium dot dot pattern data (gradation information 10), and large dot dot pattern data (gradation information 11). The pulse selection data generated according to the above will be specifically described.
When the drive signal A shown in FIGS. 5 and 6 is used (first mode), gradation control is performed by increasing or decreasing the number of drive pulses supplied to the piezoelectric vibrator 15. For example, one drive pulse is supplied to record small dots, two drive pulses are supplied to record medium dots, and three drive pulses are supplied to record large dots.
In this case, the decoder 42 responds to the small dot dot pattern data (gradation information 01), the medium dot dot pattern data (gradation information 10), and the large dot dot pattern data (gradation information 11). To generate 3-bit pulse selection data.
[0134] Each bit of the 3-bit pulse selection data corresponds to each pulse signal. That is, the most significant bit of the pulse selection data corresponds to the first pulse signal PS21 (first drive pulse DP6), the second bit corresponds to the second pulse signal PS22 (second drive pulse DP7), and is the highest. The lower bits correspond to the third pulse signal PS23 (third drive pulse DP8).
[0135] In this case, the pulse selection data (010) is generated from the dot pattern data (gradation information 01) of small dots. Similarly, the pulse selection data (101) is generated from the medium dot dot pattern data (gradation information 10), and the pulse selection data (111) is generated from the large dot dot pattern data (gradation information 11).
When the most significant bit of the pulse selection data is "1", the first timing signal (latch signal) generated at the beginning of the period T1 to the second timing signal (CH) generated at the beginning of the period T2. The switch circuit 45 (drive pulse supply means) is connected until the signal). When the second bit is "1", the switch circuit 45 is connected from the second timing signal to the third timing signal (CH signal) generated at the beginning of the period T3. Similarly, when the lowest bit is "1", the switch circuit 45 is connected from the third timing signal to the timing signal (latch signal) generated at the beginning of period T1 in the next print cycle TC. Become.
[0137] As a result, only the second drive pulse DP7 is supplied to the corresponding piezoelectric vibrator 15 based on the dot pattern data of the small dots. Similarly, the first drive pulse DP6 and the third drive pulse DP8 are supplied based on the dot pattern data of the middle dots, and the first drive pulse DP6 and the second drive are driven based on the dot pattern data of the large dots. The pulse DP7 and the third drive pulse DP8 are continuously supplied.
As a result, 13 pL of ink droplets are ejected once from the nozzle opening 13 in response to the dot pattern data of the small dots, and small dots are formed on the recording paper 8. Further, corresponding to the dot pattern data of the medium dots, 13 pL of ink droplets are ejected twice in succession from the nozzle opening 13, and medium dots of a total of 26 pL of ink droplets are formed on the recording paper 8. Similarly, corresponding to the dot pattern data of large dots, 13 pL of ink droplets are ejected three times in succession from the nozzle opening 13, and large dots of 39 pL of ink droplets in total are formed on the recording paper 8.
[0139] As described above, in the first mode, the pulse selection data is 3 bits, and the drive pulse can be generated at a relatively high speed, so that the recording speed can be increased. In particular, since 39 pL can be ejected as large dot ink droplets in one pass, the recording speed can be made extremely high as a result. However, since the medium dots and large dots are formed by the sum of the small ink droplets ejected independently, the image quality is inferior to that of the second mode and the third mode.
Next, a case where the drive signal B having the form shown in FIGS. 7 and 8 is used (second mode) will be described.
[0141] In this case, the decoder 42 responds to the small dot dot pattern data (gradation information 01), the medium dot dot pattern data (gradation information 10), and the large dot dot pattern data (gradation information 11). To generate 2-bit pulse selection data.
[0142] Each bit of the 2-bit pulse selection data corresponds to each pulse signal. That is, the upper bits of the pulse selection data correspond to the first pulse signal PS1 (small dot drive pulse DP1), and the lower bits correspond to the second pulse signal PS2 (medium dot drive pulse DP2).
[0143] In this case, the pulse selection data (10) is generated from the dot pattern data (gradation information 01) of small dots. Similarly, the pulse selection data (01) is generated from the medium dot dot pattern data (gradation information 10), and the pulse selection data (11) is generated from the large dot dot pattern data (gradation information 11).
When the high-order bit of the pulse selection data is "1", the first timing signal (latch signal) generated at the beginning of the period T1 to the second timing signal (CH) generated at the beginning of the period T2. The switch circuit 45 (drive pulse supply means) is connected to the signal). On the other hand, when the lower bit is "1", the switch circuit 45 is connected from the second timing signal to the timing signal (latch signal) generated at the beginning of the period T1 in the next printing cycle.
[0145] As a result, only the first pulse signal PS1 is supplied to the corresponding piezoelectric vibrator 15 based on the dot pattern data of small dots. Similarly, only the second pulse signal PS2 is supplied based on the dot pattern data of the middle dots, and the first pulse signal PS1 and the second pulse signal PS2 are continuously supplied based on the dot pattern data of the large dots.
[0146] As a result, small ink droplets of 3 to 9 pL are ejected from the nozzle opening 13 corresponding to the dot pattern data of the small dots, and small dots are formed on the recording paper 8. Further, 9 to 15 pL of medium ink droplets are ejected from the nozzle opening 13 corresponding to the dot pattern data of the medium dots, and the medium dots are formed on the recording paper 8. Further, 17 to 30 pL of ink droplets are ejected from the nozzle opening 13 corresponding to the dot pattern data of the large dots, and large dots are formed on the recording paper 8.
[0147] As described above, in the second mode, the pulse selection data is 2 bits, and the drive pulse can be generated at an extremely high speed, so that the recording speed can be increased. Further, since the medium dots are formed by one ink droplet and the large dots are also formed by two ink droplets, the image quality is better than that of the recording in the first mode. However, the recording speed is inferior to that of the first mode because only 30 pL can be ejected as a large dot ink droplet in one pass. Moreover, since the large dots are formed by two ink droplets, the recording image quality is inferior to that of the third mode.
[0148] Next, a case where the drive signal C having the form shown in FIGS. 9 and 10 is used (third mode) will be described.
In this case, the decoder 42 responds to the small dot dot pattern data (gradation information 01), the medium dot dot pattern data (gradation information 10), and the large dot dot pattern data (gradation information 11). To generate 10-bit pulse selection data.
[0150] Each bit of this 10-bit pulse selection data corresponds to each pulse signal and connecting element. That is, the most significant bit of the pulse selection data corresponds to the first pulse signal PS11 of the period T1, the second bit corresponds to the second pulse signal PS12 of the period T2, and the third bit corresponds to the first connection of the period TS1. Corresponding to element CP1, the 4th bit corresponds to the 3rd pulse signal PS13 arranged in the period T3, the 5th bit corresponds to the 4th pulse signal PS14 arranged in the period T4, and the 6th bit Corresponds to the 5th pulse signal PS15 placed in period T5, the 7th bit corresponds to the 2nd connection element CP2 placed in period TS2, and the 8th bit corresponds to the 6th pulse placed in period T6. It corresponds to the signal PS16, the 9th bit corresponds to the 3rd connection element CP3 arranged in the period TS3, and the 10th bit corresponds to the 7th pulse signal PS17 arranged in the period T7.
[0151] Data "0" is always set in the bit corresponding to each connection element.
[0152] In this case, pulse selection data (0100000100) is generated from the dot pattern data (gradation information 01) of small dots. Similarly, the pulse selection data (0001000000) is generated from the medium dot dot pattern data (gradation information 10), and the pulse selection data (0000100001) is generated from the large dot dot pattern data (gradation information 11).
When the most significant bit of the pulse selection data is "1", the first timing signal (latch signal) generated at the beginning of the period T1 to the second timing signal (latch signal) generated at the beginning of the period T2 ( The switch circuit 45 (drive pulse supply means) is connected to the CH signal). As a result, the first pulse signal PS11 is extracted from the drive signal C and supplied to the piezoelectric vibrator 15. Similarly, when the second bit is "1", the switch circuit 45 (drive pulse supply means) is connected from the second timing signal to the third timing signal (CH signal) generated at the beginning of the period TS1. Become in a state. As a result, the second pulse signal PS12 is extracted from the drive signal C and supplied to the piezoelectric vibrator 15. Similarly, for the third and subsequent bits, when the bit data is "1", the corresponding pulse signal is supplied.
[0154] As a result, the second pulse signal PS12 and the sixth pulse signal PS16 are supplied to the corresponding piezoelectric vibrator 15 based on the dot pattern data of the small dots. Further, based on the dot pattern data of the middle dots, only the third pulse signal PS13 is supplied to the corresponding piezoelectric vibrator 15. Similarly, the fourth pulse signal PS14 and the seventh pulse signal PS17 are supplied to the corresponding piezoelectric vibrator 15 based on the dot pattern data of large dots.
[0155] As a result, the small dot drive pulse DP3 is supplied to the piezoelectric vibrator 15 in response to the dot pattern data of the small dots, and small ink droplets of 0.5 to 4 pL are ejected to generate the small dots on the recording paper 8. Is formed. Further, in response to the dot pattern data of the medium dots, the medium dot drive pulse DP4 is supplied to the piezoelectric vibrator 15, medium ink droplets of 5 to 10 pL are ejected, and the medium dots are formed on the recording paper 8. To. Further, in response to the dot pattern data of large dots, a large dot drive pulse DP5 is supplied to the piezoelectric vibrator 15, large ink droplets of 10 to 20 pL are ejected, and large dots are formed on the recording paper 8. To.
[0156] As described above, in the third mode, since the medium dots and the large dots are each formed by one ink droplet, ultra-high image quality recording is possible. However, since the pulse selection data is 10 bits, it takes a relatively long time to generate the drive pulse, and only 20 pL can be ejected as a large dot ink droplet in one pass, the recording speed is compared with the first mode and the second mode. And inferior.
Next, the operation of the printer 1 will be described.
Prior to the recording operation, one selected image quality mode from a plurality of image quality modes (first mode to third mode) is set via the interface device 100. This image quality mode may be set automatically by the control unit 28 by a control command transmitted from the host computer or the like, regardless of the interface device 100.
[0159] When the image quality mode is set, the control unit 28 outputs control information (image quality mode information) to the drive signal generation circuit 30 and the decoder 42.
[0160] Based on this control information, the drive signal generation circuit 30 sets a state in which a drive signal can be generated according to the image quality mode. For example, if the control information indicating that the first mode is set is received, the state in which the drive signal A (Fig. 5) can be generated is set, and if the control information indicating that the second mode is set is received. The state in which the drive signal B (Fig. 7) can be generated is set, and the state in which the drive signal C (Fig. 9) can be generated is set when the control information indicating that the third mode is set is received.
[0161] Further, the decoder 42 sets a combination of print data (gradation information) and pulse selection data. For example, the decoder 42 selects the table information corresponding to the set image quality mode based on the table information in which the combination of the print data and the pulse selection data is determined for each image quality mode and the control information from the control unit 28.
Subsequently, the printer 1 performs a recording operation based on the set image quality mode.
That is, in the first mode, the drive signal generation circuit 30 (drive signal generation means) generates the first drive pulse DP6, the second drive pulse DP7, and the third drive pulse DP8 having the same waveform shape. Generates a series of connected drive signals A. Further, the decoder 42 generates pulse selection data (010) by translating the small dot print data (gradation information 01), and the pulse selection data (101) by translating the medium dot print data (gradation information 10). Is generated, and pulse selection data (111) is generated by translating the large dot print data (gradation information 11).
[0164] Then, the switch circuit 45 (drive pulse supply means) receives each time a timing signal output from the control logic 43 is input, that is, a timing defined by a latch signal (LAT) or a channel signal (CH). Each time, the content of the pulse selection data is referred to, and when the pulse selection data is (1), the drive pulse is supplied to the piezoelectric vibrator 15 over the corresponding period.
As a result, based on the print data of the small dots, only the second drive pulse DP7 is supplied to the piezoelectric vibrator 15, and small ink droplets having an ink amount of 13 pL are ejected from the nozzle opening 13. Further, based on the print data of the medium dots, the first drive pulse DP6 and the third drive pulse DP8 are continuously supplied to the piezoelectric vibrator 15, and two small ink droplets with an ink amount of 13 pL are ejected into the nozzle opening 13. Is discharged from. Similarly, based on the large dot print data, the first drive pulse DP6, the second drive pulse DP7, and the third drive pulse DP8 are continuously supplied to the piezoelectric vibrator 15, and the amount of ink is small at 13 pL. Three drops of ink are ejected from the nozzle opening 13.
[0166] Alternatively, in the second mode, the drive signal generation circuit 30 (drive signal generation means) has a series of a small dot drive pulse DP1 for ejecting small ink droplets and a medium dot drive pulse DP2 for ejecting medium ink droplets. Generate the connected drive signal B. Further, the decoder 42 generates pulse selection data (10) by translating the small dot print data (gradation information 01), and the pulse selection data (01) by translating the medium dot print data (gradation information 10). Is generated, and pulse selection data (11) is generated by translating the large dot print data (gradation information 11).
[0167] Then, the switch circuit 45 (drive pulse supply means) refers to the content of the pulse selection data each time a timing signal output from the control logic 43 is input, and when the pulse selection data is (1). , The drive pulse is supplied to the piezoelectric vibrator 15 over the corresponding period.
As a result, based on the small dot print data, the small dot drive pulse DP1 is supplied to the piezoelectric vibrator 15, and small ink droplets having an ink amount of 3 to 9 pL are ejected from the nozzle opening 13. Further, based on the print data of the middle dots, the middle dot drive pulse DP2 is supplied to the piezoelectric vibrator 15, and the middle ink droplets having an ink amount of 9 to 15 pL are ejected from the nozzle opening 13. Similarly, based on the large dot print data, the small dot drive pulse DP1 and the medium dot drive pulse DP2 are continuously supplied to the piezoelectric vibrator 15, and small ink droplets and medium ink droplets totaling 17 to 30 pL are generated. It is discharged from the nozzle opening 13.
Alternatively, in the third mode, the drive signal generation circuit 30 (drive signal generation means) has a small dot drive pulse DP3 for ejecting small ink droplets, a medium dot drive pulse DP4 for ejecting medium ink droplets, and a large ink droplet. The drive signal C including the large dot drive pulse DP5 that discharges the ink is generated. Further, the decoder 42 generates pulse selection data (0100000100) by translating the print data of small dots (gradation information 01), and pulse selection data (0001000000) by translating the print data of medium dots (gradation information 10). Is generated, and pulse selection data (0000100001) is generated by translating the large dot print data (gradation information 11).
[0170] Then, the switch circuit 45 (drive pulse supply means) refers to the content of the pulse selection data each time a timing signal output from the control logic 43 is input, and when the pulse selection data is (1). , The pulse signal is supplied to the piezoelectric vibrator 15 over the corresponding period.
As a result, based on the small dot print data, the small dot drive pulse DP3 is supplied to the piezoelectric vibrator 15, and small ink droplets having an ink amount of 0.5 to 4 pL are ejected from the nozzle opening 13. Further, based on the print data of the middle dots, the middle dot drive pulse DP4 is supplied to the piezoelectric vibrator 15, and the middle ink droplets having an ink amount of 5 to 10 pL are ejected from the nozzle opening 13. Similarly, based on the large dot print data, the large dot drive pulse DP5 is supplied to the piezoelectric vibrator 15, and large ink droplets having an ink amount of 10 to 20 pL are ejected from the nozzle opening 13.
[0172] As described above, in the present embodiment, the combination of the print data (gradation information) and the ink amount is changed for each image quality mode.
[0173] Therefore, even if the print data has the same gradation information, recording with different amounts of ink droplets is performed according to the set image quality mode. For example, in the small dot print data (gradation information 01), the ink amount in the first mode is 13 pL, the ink amount in the second mode is 3 to 9 pL, and the ink amount in the third mode is 0.5. ~ 4pL. Further, in the medium dot print data (gradation information 10), the ink amount in the first mode is 13 × 2 = 26pL, the ink amount in the second mode is 9 to 15pL, and the ink amount in the third mode is 9 to 15pL. The amount of ink is 5 to 10 pL. Further, in the large dot print data (gradation information 11), the ink amount in the first mode is 13 × 3 = 39pL, the ink amount in the second mode is 17 to 30pL, and the ink amount in the third mode is 17 to 30pL. The amount of ink is 10 to 20 pL.
As a result, the degree of freedom in setting the amount of ink corresponding to the gradation information of the print data is increased, and it becomes possible to meet the various demands of the user. For example, documents such as characters can be recorded at high speed as in the first mode, high-quality recording can be performed while maintaining the recording speed as in the second mode, and even higher image quality can be obtained as in the third mode. It is possible to make a record in pursuit of. FIG. 11 shows the relationship between the amount of ink ejected for each gradation and the recorded image quality of the present embodiment.
[0175] The drive signal defined in each mode is not limited to the above embodiment. As a modification, the drive signal D that can be defined in the second mode is shown in FIGS. 12 and 13.
As shown in FIG. 12, the drive signal D includes a first pulse signal PS31 arranged in the period T1, a first connecting element CP31 arranged in the period TS1, and a second pulse arranged in the period T2. The signal PS32, the second connection element CP32 arranged in the period TS2, the third pulse signal PS33 arranged in the period T3, and the fourth pulse signal PS34 arranged in the period T4 are connected in a series. , It is a pulse train waveform signal that is repeatedly generated in the printing cycle TD. The connection elements CP31 and CP32 are waveform elements that connect different potential levels of the pulse signals located on both sides, and are not supplied to the piezoelectric vibrator 15.
In this case, the sum of the period T1 and the period TS1 is equal to the sum of the period TS2 and the period T3.
As shown in FIG. 13, in the drive signal D, the first pulse signal PS31 is a signal that constitutes a part of the small dot drive pulse DP11 that ejects small ink droplets from the nozzle opening 13. The second pulse signal PS32 is an additional pulse DP12 for large dots that ejects additional ink droplets for large dots (second liquid droplets) from the nozzle opening 13. Here, the additional ink droplets for large dots are ink droplets that form large ink droplets in combination with the ink droplets ejected by the medium dot drive pulse DP13 described later. The third pulse signal PS33 is a signal paired with the first pulse signal PS31 to form a small dot drive pulse DP11. The fourth pulse signal PS34 is a medium dot drive pulse DP13 that ejects medium ink droplets from the nozzle opening 13.
That is, as shown in FIG. 13, a small dot drive pulse DP11 (third small dot drive pulse) is generated by extracting the first pulse signal PS31 and the third pulse signal PS33 from the drive signal D. Will be done. Similarly, by extracting the fourth pulse signal PS34 from the drive signal D, a middle dot drive pulse DP13 (third middle dot drive pulse) is generated to drive the second pulse signal PS32 and the fourth pulse signal PS34. By extracting from the signal D, a combination of the large dot additional pulse DP12 and the medium dot drive pulse DP13 as the large dot drive pulse is generated.
As shown in FIGS. 12 and 13, the small dot drive pulse DP11 has a first charging element P71 that raises the potential along a relatively gently set gradient θ51 from the intermediate potential VM, and a third highest. The first hold element P72 that maintains the potential VH3 for a relatively long time, the first discharge element P73 that lowers the potential along the steep θ52 from the third maximum potential VH3 to the minimum potential VL, and the minimum potential VL. The second holding element P74 that maintains the maximum potential VH for a predetermined time, the second charging element P75 that raises the potential from the minimum potential VL along the steep θ53 to the maximum potential VH, and the second that maintains the maximum potential VH for a very short time. 3 Hold element P76, 2nd discharge element P77 that lowers the potential along the steep θ54 from the highest potential VH to the 2nd intermediate potential VM2, and 4th hold element that maintains the 2nd intermediate potential VM2 for a very short time. Maintain P78, the third charging element P79 that raises the potential from the second intermediate potential VM2 along the steep θ55 to the second maximum potential VH2, which is slightly lower than the maximum potential VH, and the second maximum potential VH2 for a short time. It is composed of a fifth hold element P80 and a third discharge element P81 that lowers the potential along the gradient θ56 from the second maximum potential VH2 to the intermediate potential.
[0181] When the small dot drive pulse DP11 is supplied to the piezoelectric vibrator 15, small ink droplets are ejected from the nozzle opening 13.
[0182] More specifically, when the first charging element P71 is supplied and the piezoelectric vibrator 15 is charged from the intermediate potential VM, the pressure generating chamber 16 gradually contracts from the reference volume to become a small volume. Become. Subsequently, the pressure generating chamber 16 maintains a small volume by the first hold element P72. After that, the pressure generating chamber 16 is rapidly expanded by the first discharge element P73, contracted again by the second charging element P75, and expanded again by the second discharge element P77. The ink pressure in the pressure generating chamber 16 changes with this series of expansion and contraction, and ink droplets having an ink amount of about 0.5 to 4 pL are ejected from the nozzle opening 13. Subsequently, the third charging element P79, the fifth hold element P80, and the third discharging element P81 are supplied in this order. As a result, the pressure generating chamber 16 contracts and returns to expansion in order to converge the vibration of the meniscus due to ink ejection in a short time.
[0183] The medium dot drive pulse DP13 includes a fourth discharge element P82 that lowers the potential from the intermediate potential VM to the second lowest potential VL2 along the gradient θ57, and a sixth hold element P83 that maintains the second lowest potential VL2. , The fourth charging element P84 that raises the potential along the steep θ58 from the second lowest potential VL2 to the highest potential VH, the seventh hold element P85 that maintains the highest potential VH for a predetermined time, and the intermediate potential from the highest potential VH. It is composed of a fifth discharge element P86 that lowers the potential along a steep θ59 to the VM.
[0184] When the medium dot drive pulse DP13 is supplied to the piezoelectric vibrator 15, medium ink droplets are ejected from the nozzle opening 13.
[0185] More specifically, when the fourth discharge element P82 is supplied and the piezoelectric vibrator 15 is discharged from the intermediate potential VM, the volume of the pressure generating chamber 16 gradually expands from the reference volume. Then, the pressure generating chamber 16 maintains a large volume corresponding to the second minimum potential VL2 for a predetermined time by the sixth hold element P83. After that, the pressure generating chamber 16 rapidly contracts to the minimum volume corresponding to the maximum potential VH by the fourth charging element P84. Due to this shrinkage, the ink pressure in the pressure generating chamber 16 increases, and ink droplets are ejected from the nozzle opening 13. Here, the state of the minimum volume is maintained for a predetermined time by the seventh hold element P85. As a result, the amount of ink droplets ejected from the nozzle opening 13 becomes, for example, 9 to 15 pL. Subsequently, the fifth discharge element P86 expands and restores the pressure generating chamber 16 to the reference volume in order to converge the vibration of the meniscus in a short time.
On the other hand, the additional pulse DP12 for large dots has the same waveform as the medium dot drive pulse DP13 in this case, and the sixth potential is lowered from the intermediate potential VM to the second lowest potential VL2 along the gradient θ57. The discharge element P87, the eighth hold element P88 that maintains the second minimum potential VL2, the fifth charging element P89 that raises the potential along the steep θ58 from the second minimum potential VL2 to the maximum potential VH, and the maximum potential. It is composed of a ninth hold element P90 that maintains VH for a predetermined time and a seventh discharge element P91 that lowers the potential along a steep θ59 from the highest potential VH to the intermediate potential VM.
[0187] When the additional pulse DP12 for large dots and the above-mentioned medium dot drive pulse DP13 are combined and supplied to the piezoelectric vibrator 15, a large ink droplet consisting of two ink droplets is ejected from the nozzle opening 13.
[0188] In this case, it is generated according to the dot pattern data of small dots (gradation information 01), the dot pattern data of medium dots (gradation information 10), and the dot pattern data of large dots (gradation information 11). The pulse selection data will be specifically described.
In this case, the decoder 42 responds to the small dot dot pattern data (gradation information 01), the medium dot dot pattern data (gradation information 10), and the large dot dot pattern data (gradation information 11). To generate 6-bit pulse selection data.
[0190] Each bit of this 6-bit pulse selection data corresponds to each pulse signal and connecting element. That is, the most significant bit of the pulse selection data corresponds to the first pulse signal PS31 of period T1, the second bit corresponds to the first connection element CP31 of period TS1, and the third bit corresponds to the second pulse of period T2. Corresponds to signal PS32, 4th bit corresponds to 2nd connection element CP32 of period TS2, 5th bit corresponds to 3rd pulse signal PS33 located in period T3, 6th bit corresponds to period T4 It corresponds to the 4th pulse signal PS34 arranged in.
[0191] Data "0" is always set in the bit corresponding to each connection element.
[0192] In this case, the pulse selection data (100010) is generated from the dot pattern data (gradation information 01) of small dots. Similarly, the pulse selection data (000001) is generated from the medium dot dot pattern data (gradation information 10), and the pulse selection data (001001) is generated from the large dot dot pattern data (gradation information 11).
When the most significant bit of the pulse selection data is "1", the first timing signal (latch signal) generated at the beginning of the period T1 to the second timing signal (latch signal) generated at the beginning of the period TS1 (the second timing signal). The switch circuit 45 (drive pulse supply means) is connected to the CH signal). As a result, the first pulse signal PS31 is extracted from the drive signal D and supplied to the piezoelectric vibrator 15. Similarly, when the third bit is "1", from the third timing signal (CH signal) generated at the beginning of period T2 to the fourth timing signal (CH signal) generated at the beginning of period TS2. The switch circuit 45 (drive pulse supply means) is connected. As a result, the second pulse signal PS32 is extracted from the drive signal D and supplied to the piezoelectric vibrator 15. Similarly, for the 5th and 6th bits, when the bit data is "1", the corresponding pulse signal is supplied.
[0194] As a result, the first pulse signal PS31 and the third pulse signal PS33 are supplied to the corresponding piezoelectric vibrator 15 based on the dot pattern data of the small dots. Further, based on the dot pattern data of the middle dots, only the fourth pulse signal PS34 is supplied to the corresponding piezoelectric vibrator 15. Similarly, the second pulse signal PS32 and the fourth pulse signal PS34 are supplied to the corresponding piezoelectric vibrator 15 based on the dot pattern data of large dots.
[0195] As a result, the small dot drive pulse DP11 is supplied to the piezoelectric vibrator 15 in response to the dot pattern data of the small dots, and small ink droplets of 3 to 9 pL are ejected to generate the small dots on the recording paper 8. Is formed. Further, in response to the dot pattern data of the medium dots, the medium dot drive pulse DP13 is supplied to the piezoelectric vibrator 15, medium ink droplets of 9 to 15 pL are ejected, and the medium dots are formed on the recording paper 8. To. Further, corresponding to the dot pattern data of large dots, the piezoelectric vibrator 15 is supplied with the additional drive pulse DP12 for large dots and the medium dot drive pulse DP13, and a total of 17 to 30 pL of ink droplets are ejected for recording. Large dots are formed on the paper 8.
[0196] As described above, in the second mode using the drive signal D, since the pulse selection data is 6 bits, the drive pulse can be generated at a higher speed than in the third mode. Further, since the medium dots are formed by one ink droplet and the large dots are also formed by two ink droplets, the image quality is better than that of the recording in the first mode. However, since only 30pL of large dot ink droplets can be ejected in one pass, the recording speed is inferior to that of the first mode, and since large dots are formed by two ink droplets, the recording image quality is compared with the third mode. And inferior.
[0197] Another advantage when the drive signal D is used will be described. In this case, the sum of the period T1 and the period TS1 is equal to the sum of the period TS2 and the period T3, and the additional drive pulse DP12 for the large dot and the medium dot drive pulse DP13 have the same waveform. Two ink droplets forming large dots are ejected in the same amount in the same cycle. This is particularly preferable in the case of bidirectional printing because the same recording state can be realized at the time of forward movement and the time of recovery.
[0198] Further, since the main part of the small dot drive pulse DP11 is sandwiched between the additional drive pulse DP12 for large dots and the medium dot drive pulse DP13, the landing position of the small ink droplet and the large ink droplet The landing position can be aligned, and the image quality can be improved.
[0199] The pressure generating element that changes the volume of the pressure chamber 16 is not limited to the piezoelectric vibrator 15. For example, a magnetic strain element may be used as a pressure generating element, and the pressure chamber 16 may be expanded or contracted by the magnetic strain element to cause pressure fluctuation, or a heat generating element may be used as a pressure generating element and the pressure chamber 16 may be expanded or contracted to cause pressure fluctuation. The pressure chamber 16 may be configured to cause pressure fluctuations due to bubbles that expand and contract due to heat.
[0200] As described above, although the printer controller 1 is composed of a computer system, a program for realizing each of the elements in the computer system and a computer-readable recording medium 201 on which the program is recorded are also included. It is subject to protection in this case.
[0201] Further, when each of the above elements is realized by a program such as an OS operating on a computer system, a program including various instructions for controlling the program such as the OS and a recording medium 202 recording the program are also included. , Is subject to protection in this case.
[0202] Here, the recording media 201 and 202 include not only those that can be recognized as a single unit such as a floppy disk, but also a network that propagates various signals.
[0203] Although the above description has been made for an inkjet recording device, the present invention is intended for a wide range of liquid injection devices in general. As an example of the liquid, in addition to ink, glue, nail polish and the like can be used.
[Effect of the Invention] As described above, according to the present invention, the discharge drive signal is generated based on the selective image quality mode, and further based on the discharge drive signal and the selected gradation data based on the discharge data. Since the drive pulse is generated, the mode of ink ejection by the drive pulse is controlled by the two factors of the ejection mode and the gradation data, and as a result, it becomes possible to meet the various demands of the user.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of an inkjet printer according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating the internal structure of a recording head.
FIG. 3 is a block diagram illustrating an electrical configuration of a printer.
FIG. 4 is a block diagram illustrating an electric drive system of a recording head.
FIG. 5 is a diagram showing an example of a drive signal.
FIG. 6 is a diagram illustrating a drive pulse generated based on the drive signal of FIG.
FIG. 7 is a diagram showing an example of a drive signal.
8 is a diagram illustrating a drive pulse generated based on the discharge drive signal of FIG. 7. FIG.
FIG. 9 is a diagram showing an example of a drive signal.
10 is a diagram illustrating a drive pulse generated based on the discharge drive signal of FIG. 9. FIG.
FIG. 11 is a diagram illustrating a relationship between the amount of ejected ink and image quality.
FIG. 12 is a diagram showing an example of a drive signal.
13 is a diagram illustrating a drive pulse generated based on the discharge drive signal of FIG. 12. FIG.
[Code description] 1 Inkjet printer 2 Carriage 3 Guide member 4 Drive pulley 5 Idle pulley 6 Timing belt 7 Pulse motor 8 Recording paper 10 Recording head 11 Ink cartridge 12 Ink chamber 13 Nozzle opening 14 Nozzle plate 15 Piezoelectric oscillator 16 Pressure chamber 17 Ink supply port 18 Supply side communication hole 19 1st nozzle communication hole 20 2nd nozzle communication hole 23 Printer controller 24 Print engine 25 External interface 26 RAM27 ROM28 Control unit 29 Oscillation circuit 30 Drive signal generation circuit 31 Internal interface 33 Recording Electric drive system of head 34 Platen 35 Paper feed motor 36 1st shift register 37 2nd shift register 39 1st latch circuit 40 2nd latch circuit 42 Decoder 43 Control logic 44 Level shifter 45 Switch circuit
Every citation, both ways
| Document | Relation | Office | Cited during |
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| US10797270B2 | Cited by | United States of America | Applicant |
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| US11673155B2 | Cited by | United States of America | Applicant |
| US10811324B2 | Cited by | United States of America | Applicant |
| US11551982B2 | Cited by | United States of America | Applicant |
| US11167303B2 | Cited by | United States of America | Applicant |
| US11233226B2 | Cited by | United States of America | Applicant |
| US9755186B2 | Cited by | United States of America | Applicant |
| US11088035B2 | Cited by | United States of America | Applicant |
| US10784470B2 | Cited by | United States of America | Applicant |
| US9802403B2 | Cited by | United States of America | Applicant |
| JP63188055A | Cites | Japan | – |
| JP1081014A | Cites | Japan | – |
| JP8336970A | Cites | Japan | – |
| JP10109433A | Cites | Japan | – |
| JP11228888A | Cites | Japan | – |
| JP11151821A | Cites | Japan | – |
13 members in 5 offices
Priority claims6
| Document | Office | Kind | Date |
|---|---|---|---|
| 1999280811 | Japan | – | |
| 28081199 | Japan | A | |
| 2000296783 | Japan | A | |
| 1999280811 | – | – | – |
| JP19990280811 | – | – | – |
| JP20000296783 | – | – | – |
Members13
| Document | Office | Kind | |
|---|---|---|---|
| EP1088662A2 | European Patent Office (EPO) | A2 | |
| JP2001162840A | Japan | A | |
| EP1088662A3 | European Patent Office (EPO) | A3 | |
| US2002122085A1 | United States of America | A1 | |
| US6517176B1 | United States of America | B1 | |
| US6572210B2 | United States of America | B2 | |
| JP2003326748A | Japan | A | |
| JP3679987B2This record | Japan | B2 | |
| EP1088662B1 | European Patent Office (EPO) | B1 | |
| AT491576T | Austria | T | |
| ATE491576T1 | Austria | T1 | |
| DE60045362D1 | Germany | D1 | |
| EP2374620A1 | European Patent Office (EPO) | A1 |
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Numbers
- Publication
- 3679987
- Publication, DOCDB
- 3679987
- Publication, EPODOC
- JP3679987B
- Application
- 296783
- Application, DOCDB
- 2000296783
- Application, EPODOC
- JP20000296783
Titles2
- Japanese
- 液体噴射装置
- English
- Liquid injection device
Classification
- IPC, 3
- B41J2 205
- B41J2 045
- B41J2 055