Radio telephone set

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a portable radiotelephone device.

【0002】

[Conventional technology]

FIG. 6 shows an example of the general appearance of a mobile phone, in which an operation key 2 such as a dial key is provided on the front of the mobile phone 1, a through hole 3 for a handset, and a transmitter. A through hole 4 for the purpose is formed. Further, a whip antenna 5 having a predetermined length is provided on the upper surface of the telephone 1.

【0003】

However, since the antenna 5 protrudes from the telephone 1, it is not only easily damaged, but also becomes an obstacle when the telephone 1 is miniaturized.

【0004】

An inverted-F antenna using a flat plate-shaped radiating conductor is known as a device for compensating for such a defect of the whip antenna.

【0005】

FIG. 7 shows the basic configuration of an inverted-F antenna, in which 10 is the inverted-F antenna, 11 is the radiation conductor, 12 is the ground conductor, and 15 is the feeding part. In this case, the conductors 11 and 12 are formed of a rectangular conductor plate and are provided in parallel with a predetermined interval so as to face each other.

【0006】

Further, the end portion of the radiating conductor 11 is connected to the grounding conductor 12 through the conductive member 13, and the conductors 11 and 12 are connected to the feeding portion 15 through the coaxial cable 14. Further, at this time, the feeding point 11P with respect to the radiating conductor 11 is set to an asymmetrical position (this is a point corresponding to the intermediate tap of the coil) when viewed from the conductive member 13, and impedance matching is performed.

【0007】

Therefore, if the inverted-F antenna 10 is provided so as to be embedded in the upper surface or the back surface of the mobile phone 1, the protrusion from the mobile phone 1 disappears, and the problem as in the case of the whip antenna 5 does not occur. ..

【0008】

[Problems to be Solved by the Invention]

However, when the inverted F-type antenna 10 is provided on the upper surface or the back surface of the mobile phone 1, when the telephone 1 is held in the hand for a call, the radiation characteristics of the antenna 10 are disturbed due to the influence of the human body, and the effective gain is increased. It will drop.

【0009】

Furthermore, above all, since the antenna 10 is located near the user's head, particularly the auditory organ, during a call, there is a risk that the radio waves emitted from the antenna 10 adversely affect the auditory organ and the like.

【0010】

The present invention is intended to eliminate the above-mentioned problems while taking a form suitable for miniaturization of a mobile phone.

【0011】

[Means for solving problems]

Therefore, in the present invention, if the reference codes of the respective parts correspond to the embodiments described later, the radio body 21 and the movable body 22 entangled with the radio body 21 so as to be openable and closable are provided. In the wireless telephone device 20 in which the movable body 22 is in the open position during a call and is in the closed position during a non-call, the antenna 10 for transmission / reception is composed of a radiation conductor 11 and a ground conductor 12, and these radiation conductors. The radiation conductor 11 and the ground conductor 12 are arranged on the movable body 22, and the radiation conductor 11 and the ground conductor 12 are arranged in a positional relationship in which the ground conductor 12 is interposed between the radiation conductor 11 and the user during a call. It was done.

【0012】

[Action]

During a call, the ground conductor 12 is interposed between the radiant conductor 11 and the user's head, and the transmitted wave radiated from the radiant conductor 11 hardly directly hits the head. Also, the radiation characteristics of the antenna 10 are not affected.

【0013】

[Example]

1 to 3 show an example of the present invention, FIGS. 1 and 2 are a cross-sectional view and a perspective view during a call, and FIG. 3 is a cross-sectional view during a standby state.

【0014】

And in these figures, 20 shows a mobile phone according to the present invention. The telephone 20 is configured so that the entire telephone can be folded in half. 21 is the main body and 22 is the lid. The lid body portion 22 is openable and closable with respect to the main body portion 21 by a support shaft 23.

【0015】

In this case, the main body 21 and the lid 22 each have a flat rectangular parallelepiped shape, and when the main body 21 and the lid 22 are folded (the state shown in FIG. 3), the whole body is substantially a rectangular parallelepiped. The shapes of each part 21 and 22 are set so that the shape is formed and there are no large protrusions such as an antenna.

【0016】

Inside the case (cabinet) of the main body 21, a main circuit required as a mobile phone, that is, a wireless circuit 31 for making a call or connecting to a base station, a handset 32, and a power supply Batteries (not shown) are provided. Further, on the front surface of the case (the surface facing the lid 22) 21A of the main body 21, an operation key 33 such as a dial key is provided, and a through hole 34 for a handset is formed.

【0017】

Further, a transmitter 41 is provided inside the case of the lid body portion 22, and a through hole 42 for the transmitter is formed on the front surface of the case (the surface facing the main body portion 21) 22A. .. It should be noted that some circuits such as a preamplifier for the transmitter 42 can be provided inside the lid portion 22.

【0018】

In particular, in the present invention, the above-mentioned inverted-F antenna 10 is provided inside the lid portion 22. In this case, the antenna 10 is provided so that the conductors 11 and 12 are parallel to the front surface 22A, and the radiation conductor 11 is on the back surface (the surface opposite to the facing surface 22A) 22B side, and the ground conductor 12 Is provided so that is on the front 22A side.

【0019】

Further, in this example, a predetermined low-loss dielectric layer 16 is interposed between the conductors 11 and 12, and the antenna 10 is miniaturized or has a small area.

【0020】

Then, the antenna 10 is connected to the wireless circuit 31 through the coaxial cable 14.

【0021】

According to such a configuration, the lid portion 22 is opened from the main body portion 21 at the time of a call, as shown in FIG. 1 or 2. Then, the handset 32 and the handset 41 face each other with the user's ears and mouth, and in this state, as shown in FIG. 1, the radiation conductor 11 of the antenna 10 and the user The ground conductor 12 will be interposed between the head and the head of the ground conductor 12. Therefore, the transmitted wave emitted from the radiating conductor 11 hardly directly hits the head, and the adverse effect on the auditory organs and the like can be significantly reduced.

【0022】

In addition, since most of the circuits and the like are housed in the main body 21, and the main body 21 is heavier than the lid 22, the user should hold the main body 21 to dial or make a call when dialing or talking. Therefore, since the user's hand or head does not block the radiation side of the antenna 10, the radiation characteristics of the antenna 10 are not disturbed, and dialing and calling can be performed reliably. ..

【0023】

Further, when the telephone 20 is placed on a desk or the like during standby, that is, when the telephone 20 is not used for a call, the lid 22 is folded with respect to the main body 21 as shown in FIG. At this time, if the lid 22 is placed on the upper side, the radiant conductor 11 of the antenna 10 will be on the side released from the desk or the like with the ground conductor 12 in between. Since it is located, the radiation characteristics of the antenna 10 are not disturbed, and when there is an incoming call, it can be reliably received.

【0024】

Alternatively, when the telephone 20 is carried in a pocket or the like, as shown in FIG. 4, if the telephone 20 is put in the pocket so that the main body 21 is on the human body side, the radiant conductor 11 of the antenna 10 becomes the human body by the ground conductor 12. Since the antenna 10 is released from the ground, the radiation characteristics of the antenna 10 are not disturbed, and the incoming call can be reliably received.

【0025】

Moreover, since the antenna 10 does not protrude from the main body 21 or the lid 22, it is excellent in portability and suitable for miniaturization. Further, since the antenna 10 is built in the lid body 22, it is possible to make a call by simply opening the lid 22 from the main body 21, and it is not necessary to pull out the antenna.

【0026】

FIG. 5 shows an example of connection between the antenna 10 and the wireless circuit 31. That is, the wireless circuit 31 includes a receiving circuit 51, a transmitting circuit 52, an antenna sharing circuit 53, and the like. Then, at the time of a call, the radio signal of the downlink channel from the base station is received by the antenna 10, and this received signal is the signal of the capacitor 55 for DC cut the coaxial cable 14 the capacitor 54 for DC cut the shared circuit 53. The received signal is supplied to the receiving circuit 51 through the line, and the received signal is supplied to the handset 32.

【0027】

Further, the transmission signal from the transmitter 41 is supplied to the transmission circuit 52 through the signal line of the high-frequency choke coil 57 the coaxial cable 14 the high-frequency choke coil 56 to be an uplink radio signal, and this radio signal is used as an uplink radio signal. It is supplied to the antenna 10 through the signal line of the shared circuit 53 capacitor 54 coaxial cable 14 capacitor 55, and is transmitted to the base station.

【0028】

At this time, for example, when the transmitter 41 is composed of an electric condenser microphone and its buffer amplifier and requires a DC power supply, the DC power supply is transmitted from the transmission circuit 52 as described above. The signal line of the signal can be passed in the opposite direction and supplied to the transmitter 41.

【0029】

With such a connection, the number of connecting lines between the main body 21 and the lid 22 that are opened and closed can be reduced, so that the connecting lines can be easily processed and troubles such as disconnection can be caused. Can be reduced.

【0030】

In the above, the handset 32 is provided in the main body 21, and the handset 41 is provided in the lid 22, but conversely, the handset 41 is provided in the main body 21 and the lid is provided. A handset 32 can also be provided at 22. However, in this case, the telephone 20 is used upside down from FIG.

【0031】

Further, when a microstrip line is used as a feed line to the antenna 10, a 1/4 wavelength stub can be used instead of the high frequency choke coil 57.

【0032】

[Effect of the invention]

According to the present invention, since the grounding conductor 12 is interposed between the radiating conductor 11 of the antenna 10 and the user's head during a call, the radio wave emitted from the radiating conductor 11 can reach the head. There is almost no direct radiation, and the adverse effects on the auditory organs and the like can be significantly reduced.

【0033】

Further, since the user's hand or head does not shield the antenna 10, the radiation characteristics of the antenna 10 are not disturbed, and dialing and talking can be performed reliably.

【0034】

Further, since it is not used for a call, when the telephone 20 is placed on a desk or the like, if the lid 22 is placed on the upper side, the radiation conductor 11 of the antenna 10 is placed between the ground conductors 12 and the desk. Since it is located on the side that is free from such things, the radiation characteristics of the antenna 10 are not disturbed, and when there is an incoming call, it can be reliably received.

【0035】

Alternatively, when the telephone 20 is carried in a pocket or the like, as shown in FIG. 4, if the telephone 20 is put in the pocket so that the main body 21 is on the human body side, the radiant conductor 11 of the antenna 10 becomes the human body by the ground conductor 12. Since the antenna 10 is released from the ground, the radiation characteristics of the antenna 10 are not disturbed, and the incoming call can be reliably received.

【0036】

Moreover, since the antenna 10 does not protrude from the main body 21 or the lid 22, it is excellent in portability and suitable for miniaturization. Further, since the antenna 10 is built in the lid body 22, it is possible to make a call by simply opening the lid 22 from the main body 21, and it is not necessary to pull out the antenna.

[Simple explanation of drawings]

[Figure 1]

It is sectional drawing at the time of a call of one example of this invention.

[Figure 2]

It is a perspective view at the time of a call of one example of this invention.

[Fig. 3]

It is sectional drawing at the time of standby of an example of this invention.

[Fig. 4]

It is a schematic diagram at the time of carrying an example of this invention.

[Fig. 5]

It is a connection diagram of an example of this invention.

[Fig. 6]

It is a perspective view of the conventional example.

[Fig. 7]

It is a perspective view for demonstrating an inverted F type antenna.

[Explanation of symbols]

10 Inverted F antenna 11 Radiant conductor 12 Ground conductor 20 mobile phones 21 Main body 22 Lid body 31 wireless circuit 32 Handset 41 transmitter