JP4607052B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a mobile terminal device represented by, for example, a mobile phone having a casing capable of forming a closed state and an open state.

  Along with the recent increase in functionality of mobile phones, the number of cores has increased in the connection part between the receiver case with a liquid crystal display (LCD) and the transmitter case with a key. There is a demand for improved noise resistance.

  In particular, in a mobile phone, there is a receiving case that has two axes in the hinge function and is equipped with an LCD in addition to the conventional folding operation so as to correspond to an application that receives a television broadcast or a photographing application by a camera. An increasing number of models perform complex operations such as rotating. In the future, it is considered that many mobile phones that satisfy the above-mentioned demand will appear for terrestrial digital broadcasting.

  On the other hand, the mobile phone itself has been downsized, and the shaft diameter of the hinge mechanism has also been downsized. Conventionally, the connection between the receiving case and the transmitting case is generally a connection by FPC (Flexible Printed Circuit) (see, for example, Patent Documents 1, 2, and 3).

At present, in order to respond to the above-mentioned market trend, a connection using a thin coaxial cable having high noise resistance and excellent wiring properties and flexibility is becoming a trend.
JP 2004-7218 A JP 2004-120149 A JP 2004-214443 A

  By the way, according to the background art described above, since a mobile phone having both an application for receiving a television broadcast and an application for taking a picture with a camera operates exclusively, the cable routing or cost is considered. In many cases, a single display control circuit generates and outputs a video signal using the same bus line (common bus).

  In this case, noise from the camera bus line is radiated through the thin coaxial cable and goes around the television antenna. As a result, the television image and sound may be disturbed, which may cause discomfort to the user. In addition, since the reception antenna is adversely affected, the reception sensitivity is deteriorated and the performance as a mobile phone is also lowered.

  An object of the present invention is to provide a portable terminal device capable of preventing deterioration of image quality and sound during TV viewing, and preventing deterioration of reception sensitivity during TV viewing, while considering cable routing and cost reduction. It is to provide.

A mobile terminal device according to a first aspect of the present invention includes a camera, a television tuner that receives a television broadcast, an image decoding circuit that generates a video signal from an output of the television tuner, and each of the camera and the image decoding circuit. a common bus connected to, coupled to said common bus to obtain video signals are captured generated by the camera, or a video signal output by the video decoding circuit via the common bus, the Viewing monitor obtain Bei a display control circuit for supplying, in receiving a television broadcast, and a switching circuit for disconnecting the connection between said common bus and said camera.

A mobile terminal device according to a second aspect of the present invention includes a first circuit board, a display monitor connected to the first circuit board by a first wiring, the first circuit board and a second wiring. A camera connected to generate an imaging signal, a switch circuit connected to the second wiring, a TV tuner for receiving TV broadcast, a video decoding circuit for generating a video signal from the output of the TV tuner, wherein a common bus connected to each of the image decoding circuit and said switching circuit being connected to the common bus, the video signal or the image signal input through the second wiring and the switching circuit obtained via a common bus, a display control circuit for supplying to said display monitor via the first wiring, it is mounted on the first circuit board, the movies by the display control circuit television broadcast Obtain Bei between a main control circuit for controlling the switching circuit so as to disconnect the connection between the common bus and the camera, the which outputs a signal to the display monitor.

  Preferably, the first housing containing the first circuit board, the display monitor and the first housing can be formed in an open state and a closed state via a hinge shaft. A second housing coupled to the first housing, wherein the first wiring and the second wiring are inserted into the hinge shaft to communicate from the first housing to the second housing. It is arranged to do.

  Suitably, the said switch means is provided in the said 1st housing | casing.

Preferably, the second wiring is a thin coaxial cable connecting the camera and the switch circuit.

  According to the present invention, a portable terminal device that prevents deterioration in image quality and sound during TV viewing and prevents reception sensitivity during TV viewing while considering cable routing and cost reduction in realizing a folding housing. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a front view showing an external appearance of a mobile terminal device 1 according to an embodiment of the present invention in an open state, and FIG. 3A is a front view showing the appearance of the mobile terminal device 1 in a closed state, and FIG. 3B is a rear view showing the appearance of the mobile terminal device 1 in a closed state.

The mobile terminal device 1 is configured as a so-called foldable mobile phone, and includes a receiving housing (first housing) 2 and a transmitting housing that are rotatably connected to each other between an open state and a closed state. A body 3 (second housing) is provided.
The receiving case 2 and the transmitting case 3 form a case of the entire mobile terminal device 1 by connecting the end portions of the receiving case 2 and the transmitting case 3 by a connecting portion 4 that is the center of rotation.

  The receiving housing 2 and the transmitting housing 3 are each formed in a generally thin rectangular parallelepiped, and are superposed on each other in the closed state, and the outlines of the receiving housing 2 and the transmitting housing 3 substantially coincide with each other when viewed from the other housing side. It is like that.

The receiving case 2 includes a front side case 6 on the side facing the transmitting case 3 in the closed state, a back side case 7 on the back side, and a panel 8 attached to the back side of the back side case 7. I have.
The front side S1 facing the transmission case 3 in the closed state of the receiving case 2 is constituted by a front case 6, and the opposite rear side S 2 is constituted by a rear case 7 and a panel 8.
The front side case 6, the back side case 7, and the panel 8 are each formed of, for example, a nonconductive resin.

A sound emitting hole 12 of a speaker for call (not shown) is opened in the front surface S1 of the receiving case 2. The receiving case 2 is provided with a main display unit 13 (display monitor) for displaying images and characters on the front surface S1, and a sub-display unit 14 (FIG. 3 (a)) for displaying images and characters on the back surface S2. ing. That is, the main display unit 13 is provided at a position hidden in the closed state, and the sub display unit 14 is provided at a position not hidden even in the closed state. The main display unit 13 and the sub display unit 14 are configured by display devices such as a liquid crystal display device and an organic EL (Electronic Luminescence) display device, for example.
The panel 8 is translucent and also serves as a protective cover for the sub display unit 14.
Further, a camera 20 having a shooting direction on the back S2 side is disposed inside the panel 8.

The transmitter case 3 includes a front-side case 9 on the side facing the receiver case 2 in the closed state, a back-side case 10 on the back side, and a lid 11 that covers the back side of the back-side case 10. It has. The front surface S3 facing the receiving housing 2 in the closed state of the transmitting housing 3 is constituted by a front case 9, and the back surface S4 on the opposite side is constituted by a back case 10 and a lid 11.
The front side case 9, the back side case 10, and the lid body 11 are each formed of, for example, a non-conductive resin.

A sound collection hole 16 of a microphone for communication (not shown) is opened on the front surface S3 of the transmission housing 3, and a sound emission hole 17 is closed to the side of the notification speaker (not shown) on the back surface S4 side. is doing. The transmitter case 3 is provided with an operation unit 18 including various keys exposed on the front surface S3.
The various keys are, for example, a dial key 18a, a cursor key 18b, a function key 18c, and an enter key 18d.
In addition, the transmission case 3 is provided with an infrared trusted infrared communication unit 21 having the back S4 side as a transmission / reception direction.

The connecting portion 4 has a notch 27 formed at the end of the receiver case 2 and a protrusion 28 formed at the end of the transmitter case 3. It is pivotally supported and configured.
The notch 27 and the protrusion 28 are formed, for example, such that the width in the direction of the rotation axis (the left-right direction in FIG. 1) is about half the width of the receiving housing 2 and the transmitting housing 3. It is formed at the center in the width direction of the body 2 and the transmission housing 3.
The protruding portion 28 protrudes from the front surface S <b> 3 of the transmitting housing 3 in a direction opposite to the receiving housing 2 in the closed state at a height similar to the thickness of the receiving housing 2.

  FIG. 4 is a block diagram showing an example of the configuration of the signal processing system of the portable terminal device according to the embodiment of the present invention shown in FIG.

  As shown in FIG. 4, the mobile terminal device 1 includes a receiving case 2 as a first case and a transmitting case 3 as a second case. As described above, the housing 3 is mechanically connected via the connecting portion 4 (hinge mechanism), and is electrically connected to the main cable 41 as the first wiring and the camera cable as the second wiring. 42.

The main cable 41 and the camera cable 42 are both constituted by a thin coaxial cable, and both pass through a hinge bearing that is inserted from the notch 27 into the protrusion 28, and from the inside of the transmitting case 3 to the receiving case 2 It is arranged in contact with the inside.
A thin coaxial cable has a relatively small diameter among coaxial cables, and has a diameter of 1 mm or less, for example. Recently, those having a diameter of 0.3 mm or less are also known, and have higher noise resistance than FPC, and are excellent in wiring property and flexibility.

A main display unit 13 as a display monitor, a sub display unit 14, a camera 20, and a speaker 50 are mounted on the receiving case 2.
Further, the main display unit 13 and the sub display unit 14 are configured by, for example, an LCD, and are mounted on a circuit board 40 as a second circuit board on which the drive circuit is formed.

On the other hand, the transmission case 3 includes a circuit board 30 as a first circuit board, a TV antenna 31, a transmission / reception antenna 35, and a microphone 43.
On the circuit board 30, a TV tuner 32, a video decoding circuit 33, a display control circuit 34, a communication processing circuit 36, an audio processing circuit 37, a main control circuit 38, and a switch circuit 39 are mounted. .

The main control circuit 38 is composed of, for example, a CPU and a memory (both not shown), and the CPU sequentially reads and executes a program recorded in the memory, whereby the TV tuner 32, the video decoding circuit 33, and the display control circuit 34. The peripheral LSIs such as the communication processing circuit 36, the audio processing circuit 37, and the switch circuit 39 are controlled.
As will be described later, the main control unit 38 causes the main display unit 13 to display an image when the receiving case 2 and the transmitting case 3 are in an open state, and when a closed state is detected, the main control unit 38 records a television broadcast. Except for the inside, the image display by the display control circuit 34 is switched from the main display unit 13 to the sub display unit 14.

  The TV tuner 32 converts, for example, a terrestrial digital broadcast wave received via the TV antenna 31 into an intermediate frequency signal and demodulates it, and further obtains the demodulated signal as a video signal component and an audio signal component. And are supplied to the video decoding circuit 33 and the audio processing circuit 37, respectively.

  The audio processing circuit 37 generates an audio signal from the input audio signal component, and outputs it to the speaker 50 of the receiving housing 2 via the main cable 41.

The video decoding circuit 33 decodes the input video signal component and outputs the decoded video signal component to the display control circuit 34 via the common bus 100.
The display control circuit 34 converts the decoded signal output from the video decoding circuit 33 into video data according to a predetermined format, and outputs the video data to the main display unit 13 of the receiver housing 2 via the main cable 41.

  In addition, the display control circuit 34 acquires image data captured and generated by the camera 20 via the camera cable 42, the switch 39, and the common bus 100, converts the image data into video data according to a predetermined format, and receives the image data via the main cable 41. The data is output to the main display unit 13 or the sub display unit 14 of the housing 2.

As described above, the display control circuit 34 acquires the output of the video decoding circuit 33 and the output of the camera 20 as the video input via the common bus 100, and the television broadcast under the control of the main control unit 38. During reception, the switch circuit 39 is turned off to disconnect the common bus 100 and the camera 20 (camera cable 42).
As a result, the display control circuit 34 prevents noise emission from the thin coaxial cable during TV broadcast reception.

On the other hand, the communication processing circuit 36 includes a high-frequency circuit, and modulates audio data input through the microphone 43 and processed by the audio processing circuit 37 in order to perform radio communication using radio waves. To send.
Further, the communication processing circuit 36 demodulates the signal received via the transmission / reception antenna 35 and outputs the demodulated signal to the speaker 50 of the receiver case 2 via the audio processing circuit 37.

  FIG. 5 is a diagram cited for enlarging the configuration around the display control circuit 34 shown in FIG. 4 and explaining the operation principle thereof. In FIG. 5, blocks with the same numbers as the blocks shown in FIG. 4 are the same as those shown in FIG.

  Hereinafter, the operation of the portable terminal device according to the embodiment of the present invention will be described in detail with reference to FIG.

As shown in FIG. 5, according to the embodiment of the present invention, the switch circuit 39 is inserted into the camera cable 42 laid on the circuit board 30 of the transmitter casing in the transmitter casing 3. The Thus, when the main control circuit 38 is instructed to start the TV tuner 32 by key operation, the display control unit 34 is controlled, and the switch circuit 39 is turned off (common to the camera 20) by the control signal output from the display control unit 34. The bus 100 is disconnected). The main control circuit 38 determines that the television broadcast is being received (the TV is being activated) until the TV tuner end instruction is input, and the switch circuit 39 is kept in the OFF (separated) state during this time. When an instruction to end the TV tuner is input, the switch circuit 39 is switched to the ON state (connection between the camera 20 and the common bus 100).
That is, when the television broadcast is being received (when the television is activated), the switch circuit 39 is turned off to disconnect the television and the camera bus line (common bus 100) and prevent noise radiation from the camera cable 42 (thin coaxial). It is out.
In particular, when a video-related device is mounted on the receiver case 2 and only the camera has to be mounted on the transmitter case 3 due to space and usability, the transmitter case 3 and the receiver case 2 Must be connected by a camera cable 42. In this case, since the length of the camera cable 42 has a certain length, a signal that wraps around from the video decoding circuit 33 while the TV is activated, although the camera 20 is not in use, The cable 42 radiates as an antenna. However, since the camera cable 42 is configured to be disconnected in the transmission side housing as in the present invention, the signal does not circulate from the video decoding circuit 33, and radiation to the TV antenna 31 and the transmission / reception antenna 35 is prevented. Can be cut. When the television tuner 32 is not used, the camera 20 and the common bus 100 are switched so as to be connected, so that when the camera is used, video processing can be performed by the same display control circuit 34 as the television. Further, since only the camera cable 42 which is a thin coaxial of the camera system is configured to be independent from the main cable 41 which is another thin coaxial, there is no adverse effect on the main cable 41 due to the interposition of the switch circuit 39. .

  With this configuration, the display control circuit 34 can be partially shared (shared) by the camera and the TV, which are functions that are not used simultaneously, so the number of parts used can be reduced. Alternatively, it is possible to cope with a low-function and low-cost video processing device.

Further, according to the embodiment of the present invention, the receiving housing 2 and the transmitting housing 3 are rotatably connected by the connecting portion 4 (hinge mechanism), and the main cable 41 and the camera cable 42 are hinged. The mechanism is inserted and drawn from the transmitting housing 3 to the receiving housing.
In particular, the camera 20 is routed by the camera cable 42 to the receiving housing 2 different from the circuit board 30 mounted on the transmitting housing 3.
Therefore, there is a higher possibility that radiation will be generated from the fine coaxial line, but this can be avoided by inserting the switch circuit 39.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes a design and the like within a scope not departing from the gist of the present invention.
Although description was made using a mobile phone as an example of the mobile terminal device in the present invention, the present invention is not limited to this, and in PDA (Personal Digital Assistance), PHS (Personal Handy Phone System), portable game machines, and navigation systems It goes without saying that is also applicable.

It is a figure which shows the external appearance structure of the portable terminal device which concerns on embodiment of this invention. It is a figure which shows the external appearance structure of the portable terminal device which concerns on embodiment of this invention. It is a figure which shows the external appearance structure of the portable terminal device which concerns on embodiment of this invention. It is a block diagram which shows an example of a structure of the signal processing system of the portable terminal device concerning embodiment of this invention shown in FIG. FIG. 5 is a diagram cited for enlarging the configuration around the display control circuit 34 shown in FIG. 4 and explaining its operating principle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Portable terminal device, 2 ... Reception housing | casing (1st housing | casing), 3 ... Transmission housing | casing (2nd housing | casing), 13 ... Main display part (display monitor), 14 ... Sub display part, 20 DESCRIPTION OF SYMBOLS ... Camera, 30 ... Main circuit board (first circuit board), 31 ... TV antenna, 32 ... TV tuner, 33 ... Video decoding circuit, 34 ... Display control circuit, 35 ... Transmission / reception antenna, 36 ... Communication processing circuit, 37 ... Audio processing circuit, 38 ... Main control circuit, 39 ... Switch circuit, 40 ... Sub circuit board (second circuit board), 41 ... Main bus (first wiring), 42 ... Camera bus (second wiring) 43 ... microphone, 50 ... speaker, 100 ... common bus.

Claims (5)

A camera,
A TV tuner for receiving TV broadcasts;
An image decoding circuit for generating a video signal from the output of the TV tuner;
A common bus connected to each of the camera and the image decoding circuit;
Which is connected to the common bus, the video signal is captured generated by the camera, or the acquired image signal output by the video decoding circuit via the common bus, a display control circuit for supplying to the Viewing the monitor,
A mobile terminal device comprising: a switch circuit that disconnects the connection between the common bus and the camera during reception of a television broadcast. A first circuit board;
A display monitor connected to the first circuit board by a first wiring;
A camera connected to the first circuit board by a second wiring to generate an imaging signal;
A switch circuit connected to the second wiring;
A TV tuner for receiving TV broadcasts;
A video decoding circuit for generating a video signal from the output of the TV tuner;
A common bus connected to each of the switch circuit and the image decoding circuit;
The video signal or the imaging signal input via the second wiring and the switch circuit is connected to the common bus, is acquired via the common bus, and the display monitor is acquired via the first wiring. A display control circuit for supplying to
The switch circuit is mounted on the first circuit board and controls the switch circuit to disconnect the common bus from the camera while the video signal is output to the display monitor by the display control circuit. A main control circuit;
A portable terminal device comprising: A first housing containing the first circuit board, and the display monitor are contained, and the first housing is connected to the first housing via a hinge shaft so that an open state and a closed state can be formed. A second housing,
The first wiring and the second wiring are arranged so as to be inserted into the hinge shaft so as to communicate from the first housing to the second housing. The mobile terminal device according to 1. The portable terminal device according to claim 3, wherein the switch means is provided in the first casing. The portable terminal device according to any one of claims 2 to 4, wherein the second wiring is a thin coaxial cable that connects the camera and the switch circuit .

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