Multi-color image forming device

[Detailed Description of the Invention]

[Industrial Application] The present invention relates to the multi-colored picture image formation device which forms a multicolor multiplex picture based on a multi-colored picture image signal.

[Description of the Prior Art] Usually, by forming a picture for every color ingredient and carrying out multiplex [ of them ], the multi-colored picture image formation device is constituted so that a multi-colored picture image may be formed. However, the accuracy fall of a noted machine part may arise and picture degradation may arise from the request of low-pricing of devices, etc. And this picture degradation is classified into the thing of a long cycle, and the thing of a short cycle. Picture degradation of a long cycle takes place by B, Timura, etc. which say the color nonuniformity and tint change by the resist timing etc. which produce the picture for every color ingredient in the paper feed at the time of carrying out multiplex and which, on the other hand, produce picture degradation of a short cycle from gap of the field accuracy of a polygon mirror. And it is J from the former. - The color laser printer which adopted the halftone dot art in printing is known as a means to prevent picture degradation of a long cycle which carried out Description. Drawing 10 is a lineblock diagram showing the outline of the image formation part of such a color laser beam printer. In a figure, photo conductor l is rotating in the direction of arrow A. The semiconductor laser modulated in such a color laser beam printer according to image data 12 of each color ingredient emitted from signal generation means 11 after photo conductor l was first charged uniformly with electrification machine 3, A picture part is exposed, a nonimage area performs image exposure by the image scanning exposure which is not exposed, and an electrostatic latent image is formed. And this 1st amorous-glance latent image is developed by development counter 5 of the 1st amorous glance, and a toner image is formed on photo conductor 1. This image is transferred on decalcomania paper 7 beforehand fed to transfer drum 13 with transfer electrification machine 6, and the transfer remaining toner which remained on photo conductor l is cleaned by cleaner 10 after this. After performing the above operation for every color and forming a multiplex picture on transfer drum 13, corona separation of the decalcomania paper 7 is carried out by median strip electrical machinery 8, and constant blue Delivery is carried out by fixing assembly 9. An image concentration signal is given to such a laser beam printer, and in order to reproduce the intermediate color picture according to an image concentration signal, the method of modulating the luminescence time of laser according to an image concentration signal is proposed. Drawing 11 is a block diagram showing the circuit composition which realizes such a method. Digital data 21 from digital data output unit 31 is changed into analog image signal 22 by D/A converter 32. On the other hand, Reference clock signal 24 with which oscillator 33 generates transmission pixel clock 23 of image data Pattern signal 26 (for example, triangular wave) which makes a synchronized signal screen clock 25 produced in timing signal generating circuit 34 by carrying out Divide (here, it counts down to 1/2 cycle) is made by pattern signal generator 35. In analog image signal 22 and pattern signal 26, it is compared by comparison machine 36, when analog image signal 22 is larger, "O'' is created, and when small, 2 value-ized image data 27 is created as "Engineering." comparing with the triangular wave of a predetermined cycle with such an image processing method, once changing digital one No. 11118 into an analog image signal -- Hub -- continuous Pulse Density Modulation is performed and the good high definition picture output of the first floor tonality is obtained. and the thing for which shift register 37 is provided between timing signal generating circuit 34 and pattern signal generator 35, and the phase of pattern signal 26 is delayed for every scan line in the circuit of such Pulse Density Modulation -- image formation -- the Horny halftone dot-ized picture which it had can be outputted. 12th rI4 is a wave form chart showing the example of delay generating of the pattern signal for every [ by this delay circuit ] scan line. Drawing 13 is a mimetic diagram showing the pattern of the output picture of the glad countenance by this pattern signal. Storage density is set to 400dpi in 80dpi and the subscanning direction at a scanning direction, and the delaying amount of a pattern signal makes the 1st amorous glance 215 pixels, it makes the 2nd amorous glance 375 pixels here, and it is each image formation angle. It was considered as 26.6-degree, -26, and 6'. Thus, by giving a different image formation angle for every color, even if gap arises, color nonuniformity and an output picture without tint change are obtained by the color laser beam printer which took in printing technique. Hereinafter, the reason which neither color nonuniformity nor tint change produces is explained in full detail. If there is usually no gap when it carries out multiplex [ of the pattern of each color shown in Drawing 13 ], as shown in Drawing 14 (&), the overlapping pixel and the pixel which is not carried out have appeared periodically. Here, as temporarily shown in Drawing 14 (b), it is assumed that the picture of *i amorous glance has A(ed) in the direction of figure Nakamigi by 1 pixel on the whole than the position by which multiplex should be carried out essentially. Although gap has arisen in the appearing position with the pixel which does not overlap with a pixel duplicate one time itself if Drawing 14 (a) is compared with Drawing 14 (b), it turns out that those appearing patterns are completely the same -- gap -- 1 -- it also turns out that the number which is the pixel which stopped overlapping although it should have overlapped essentially, and the number which is a pixel which has overlapped although it cannot have overlapped are the same numbers. Thus, as a result, a picture without a color whip or tint change can be produced.

The issue 1 which [invention tends to solve By the way, in the thing using a polygon mirror, it turns out at the scanner like the above-mentioned color laser beam printer that picture degradation of the short cycle by pitch nonuniformity etc. occurs as mentioned above. Therefore, since it writes in in each direction of the main scan and a subscan periodically for every scan line and a position shifts, when the polygon mirror which is the 8th page with bad accuracy for every field is used, for example, As shown in Drawing 15, there was a fault that a slanting stripe will occur, especially in a highlight and a halftone part. Since this has light volume distribution as the scanning beam which forms each A pot shows in Drawing 16, When a beam is scanned by the position which A(ed) from the position which should be formed essentially, it is for an unequal interference to take place between 1. each A pot, as are shown in Drawing 17, and the surrounding pixel and that of each A pot arranged mostly at equal intervals shift and it is shown in Drawing 18. Therefore, -1-After all" 2 Fuzzy and this fault tend to increase resolution. Shape of the pixel which forms 1 pixel when the minute gap of carrying out half-drawing proportional division A with the position by which multiplex should be carried out essentially etc. arises, as shown in Drawing 19, In order that the area of the overlapping portion might different Becoming c Keep, in a highlight or a halftone part, there was also a fault that color nonuniformity and tint change will arise especially. And such a fault exists in the color laser beam printer using all the halftone dot art containing not only the printer using the PAL Radiation modulation method described according to the conventional example but the printer etc. which used the threshold matrix for others. The object for the from sheep aims at providing the multi-colored picture image formation device which can prevent picture degradation of the color gap at the time of carrying out image formation using halftone dot art, pitch nonuniformity, Sushi nonuniformity, etc.

[A means to solve N title] A generating means which generates a multi-value image signal of two or more colors, An image formation means which carries out image formation with a different image formation angle for every color ingredient, A recording device which records this formed image on an image support object, A multiplex means to pile up a picture for every color ingredient, It is the multi-colored picture image formation device provided with the above, and about at least 2 colors, with A, each pixel arranged with a different image formation angle is made to approach a determined direction mutually, and an account image formation means of : forms it in approximately band-like.

[Function] Each pixel arranged in the present invention with an image formation angle which is different of each color ingredient is made to approach a determined direction mutually, and is formed in approximately band-like, While degradation of a long cycle is removed, without spoiling the same effect as the halftone dot printing technique which superposition of this approximately band-like pixel will act, and was explained according to the above-mentioned conventional example, Since the area of the portion which overlapped and existed does not change from the minute color gap which arises in multiplex [ of each color ] at all to big color gap, the multi-colored picture image which does not have tint change to any amounts of color gaps is obtained. Each pixel is made to approach and it sets between each pixel by formation compared with the pixel isolated at equal intervals like before to approximately band-like, The side lobe of light volume distribution interferes each other, and even if a pixel is A(ed), carried out and caused, in order to act that a picture is easy to be formed more nearly linearly, the influence and picture degradation of a short cycle peculiar to a laser beam printer peculiar to development in electro-photography (a slanting female pitch nonuniformity etc.) are reduced.

[Example] Drawing 1 is a block diagram showing the Pulse-Density-Modulation circuit in the color laser beam printer by one example for from 2. Although the fundamental composition of this example is the same as that of the conventional example mentioned above, it forms the approximately band-like pixel which has an image formation angle which is different in each Color formation general invitation in this example by setting up suitably the resolution in pattern 09 generator 35', and the delaying amount in shift register 37'. Drawing 2 -- such -- each color (a figure two kinds) -- abbreviated -- it is a mimetic diagram showing the case where a beltlike pixel is outputted. Each inclination thick line of a figure shows signs that a picture pattern is formed beltlike by the pixel of each color approaching and being arranged continuously, Drawing 2 (a) shows the pattern of the 1st amorous glance, and Drawing 2 (b) shows the pattern of the 2nd amorous glance. In the \ case, each pixel is arranged by exposure distribution as shown in Drawing 3. Drawing 2 of the above shows the output state of the halftone image, and the output state of the highlight picture is shown in Drawing 4. Drawing 5 shows the arrangement situation of the pixel for every color, (a) corresponds to the 1st amorous glance and (b) corresponds to the 2nd amorous glance. In this example, storage density of the scanning direction was set to 160dpi, and storage density of the subscanning direction was set to 400dpi. The image formation angle made the 1st amorous glance 26.6 degrees, and made the 2nd amorous glance -26 and 8'. And in order to arrange a pixel as mentioned above, in pattern signal generator 35', resolution is set to 200dpi and a pattern signal (triangular wave) as shown in Drawing 6 is generated. And in shift register 37 degree, this pattern signal (triangular wave) was delayed with the following delaying amounts for every scan line. That is, in the 1st amorous glance, 475 pixels and the 2nd amorous glance made 175 pixels the delaying amount of the triangular wave in each color. In this example, in order to obtain a still more nearly linear picture to a latent image with the exposure distribution on a straight line as shown in Drawing 3, the publicly known two-ingredient brush developing-negatives method was used for the developing means of the 1st the O figure of the above. As mentioned above, superposition of this approximately band-like pixel will act by having made the pixel of each color follow approximately band-like, Since the area of the overlapping portions does not change without spoiling the effect of the above-mentioned halftone dot printing technique as degradation of a long cycle is removed and it is further shown in Drawing 7 also to big color gap from the minute color gap which arises in multiplex [ of each color ]. The multi-colored picture image in which To does not have tint change to what kind of amount of color gaps, either is obtained. Each pixel is made to approach and it sets between each pixel by formation compared with the pixel of the circumference as shown in Drawing 17, and an isolated pixel at equal intervals to approximately band-like, Even if the side lobe of light volume distribution interferes each other and a pixel A, in order to act that a picture is easy to be formed more nearly linearly, for a slanting female, picture degradation of short cycles, such as pitch nonuniformity, is reduced. As a method of arranging pixels to the above approximately band-like, various kinds of combination can be considered to the storage density of the subscanning direction by setting up suitably the resolution in pattern signal generator 35', and the delaying amount in shift register 37 degree. For example, be shown in the 8rM C& and (b). When the storage density of a scanning direction is [ the storage density of 200clpi and the subscanning direction ] 600dpi, the resolution of pattern signal generator 35" -- the delaying amount of 200dpi and a triangular wave -- the 1st amorous glance -- 1/3 pixel and the 2nd amorous glance -- 1 -- when it is considered as (=273) 1/3 pixel, the 1st amorous glance can obtain the pattern in which 45 degrees and $2 amorous glance have an image formation angle of -45." When the storage density of a scanning direction is [ the storage density of 200dpi and the subscanning direction ] 800dpi, When 1/4 pixel and the 2nd amorous glance make the delaying amount of 200dp i and a triangular wave 3/4 pixel for the resolution of pattern signal generator 35 * in M1 amorous glance, the 1st amorous glance can obtain 26.6' and the pattern in which it has an image formation angle which is 2 amorous-glance car 26.6degree for 1 s. Although the image formation angle of each color was symmetrically set up in the above explanation, various combination, such as making one side into 0'' and making another side into 45' for example, is possible. Although a Pulse-Density-Modulation circuit is used for the above example, the 1 present invention is not limited to this and can be similarly applied, for example in LBP using a threshold matrix, etc. 1 pixel is equivalent to 400dpiX400dpi on the basis of Mathot Lee of 6X6, and A cup here where $9 figure shows an example of threshold Mathot Lee 7 A cup. And Drawing 9 (a) corresponds to the 1st amorous glance, Drawing 9 (b) corresponds to the 2nd amorous glance, and Drawing 9 (C) corresponds to the 3rd amorous glance. By such a threshold matrix as well as the example mentioned above, the pattern which has arranged each pixels to approximately band-like can be obtained. If the picture which is not restricted to what is shown in Drawing 9 as a threshold matrix, and is outputted is formed beltlike, of course, other patterns are applicable. In each above-mentioned example, although the example which forms the multiplex picture of 2 colors and 3 colors was described, the present invention is not limited to this and is effective in multiplex Arrangement gold of 2 or more colors.

[Effect of the Invention] As explained above, in the present invention, proximity arrangement of each pixel is carried out in a determined direction approximately band-like. therefore, it comes out for it to be stabilized and to form a multicolor multiplex picture without picture degradation of color nonuniformity, Bifutimura, Sushi nonuniformity, etc., and there is y Effect.

[Brief Description of the Drawings]

Drawing 1 is a block diagram showing the Pulse-Density-Modulation circuit in the color laser beam printer by one example of the present invention. Drawing 2 is a mimetic diagram showing appearance KABATAAN of the 8-Futton picture in the example. Drawing 3 is a mimetic diagram explaining exposure distribution of each actual pixel in above-mentioned appearance KABATAAN. Drawing 4 is a mimetic diagram showing appearance KABATAAN of the highlight picture in the example. Drawing 5 is a mimetic diagram showing the arrangement situation of the pixel for every [ in the example ] color. Drawing 6 is a mimetic diagram showing the example of delay of the pattern signal in the example. Drawing 7 is a mimetic diagram which compares and illustrates the output picture of the example by the case where there is nothing with the case where there is gap. Drawing 8 is a mimetic diagram showing appearance KABATAAN by other examples of the present invention. Drawing 9 is a mimetic diagram showing an example of the threshold matrix by the example of further others of the 1 present invention.

[101g1 is a figure about the style which shows the outline of the image formation part of a color laser beam printer. Drawing 11 -- the -- it is a block diagram showing the Pulse-Density-Modulation circuit in the printer shown in theta [ 1 ] figure. Drawing 12 is a wave form chart showing the example of delay of the pattern signal in the Pulse-Density-Modulation circuit shown in 1iIl1 figure. The 13th rpJ is a mimetic diagram showing the pattern of the output picture of each color by the pattern signal shown in Drawing 12. Drawing 14 is a mimetic diagram which illustrates the time of producing the time of there being no gap, and gap for 1 pixel by comparison, when each color picture is overlapped in the printer shown in 5ios. The 15th v!J is a mimetic diagram showing signs that the stripe of eye I4 occurred, when each color picture is overlapped in the printer shown in Drawing 10. Drawing 16 is a mimetic diagram showing the light volume distribution in a laser beam printer. Drawing 17 is a mimetic diagram showing the A pot arrangement in the conventional picture. $18 figure is a mimetic diagram showing the state where interference arose between each A pot in the conventional picture. Drawing 19 is a mimetic diagram which illustrates the time of producing gap for half-A vote [ the time of there being no gap ] by comparison, when each color picture is overlapped in the printer shown in Drawing 10. 1 ... photo conductor, 3 ... electrification machine, 4 ... semiconductor laser, 5 ... development counter, 6 ... transfer electrification machine. 7 ... Decalcomania paper. 8 ... Median strip electrical machinery. 9 ... fixing assembly, 0 ... cleaner, 1 ... signal generation means, 2 ... transfer drum.