JP2009010569A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device which can reduce interference of mounted electronic components with each other and whose case can be made compact. <P>SOLUTION: The mobile terminal device includes the case, a circuit substrate 60 which is provided in the case and on which a radio circuit 61a and a control circuit 62a are mounted, and a battery 46 arranged in the case to supply power supply voltage to the radio circuit 61a and the control circuit 62a, wherein the circuit substrate 60 has a first mounting part 61 on which the radio circuit 61a is arranged, a second mounting part 62 on which the control circuit 62a is arranged, a notch part 64 formed between the first mounting part 61 and the second mounting part 62 to partition the first mounting part 61 and the second mounting part 62, and an intermediate mounting part 63 connecting one end side of the first mounting part 61 to one end side of the second mounting part 62 and formed adjacently to the notch part 64, and the battery 46 is arranged at the notch part 64. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile communication device such as a mobile phone device or a simple mobile phone, or a PDA (Personal Digital Assistant). In particular, the present invention relates to a substrate arrangement structure of a mobile terminal device.

  In recent years, portable information wireless terminals have been improved in convenience by mounting many electronic components such as a wireless unit, an information processing unit, a power supply unit, a display unit, and an acoustic unit in the casing, and the size of the casing has been reduced. Thinning is required. In particular, in the cellular phone, it has been required to reduce the size and thickness of the casing while improving the design in addition to the above convenience.

  However, when the above-mentioned electronic components are arranged on the substrate based on the conventional arrangement method, if the mobile phone is reduced in size and thickness, the respective electronic components are too close to each other. There was a case where they interfered with each other and caused problems.

  Here, the mounting state of the electronic component 120 in the conventional mobile phone 100 is shown in FIG. As shown in FIG. 6, the conventional mobile phone 100 includes a first circuit board 110, a second circuit board 111, an electronic component 120, a battery 130, and the like that are arranged in a layered manner. It was possible to implement efficiently. However, since the mobile phone 100 is arranged in a state where these respective elements are stacked, when the casing of the mobile phone 100 is thinned, the respective elements need to be thinned. There were restrictions on the performance of each element's function.

  Further, when the elements are arranged close to each other in order to reduce the thickness of the housing, for example, the digital circuit is mainly used between the block of the radio circuit 121 mounted on the first circuit board 110 and the block of the digital processing circuit 122. Radiated radio waves generated from the processing circuit 122 may cause performance degradation such as modulation accuracy, C / N characteristics, reception sensitivity suppression, and the like of electronic components mounted on the radio circuit 121. In addition, the burst transmission wave transmitted from the wireless circuit 121 may cause deterioration in the operation performance, sensor performance, and the like of electronic components mounted on the digital processing circuit 122.

On the other hand, a mobile phone is disclosed in which a slit is formed in the central portion of the circuit board of the mobile phone, and is divided into a ground conductor of the radio circuit and a ground conductor of the control circuit, thereby avoiding interference between the functions of the respective circuits. (For example, refer to Patent Document 1).
JP 11-088209 A

  However, the mobile phone disclosed in Patent Document 1 is configured such that the ground conductor in which the wireless circuit is disposed and the ground conductor in which the control circuit is disposed are separately disposed through the slit. The substrates on which the control circuits are mounted are merely provided with slits between them, and no element is provided to block between the circuits. As a result, there is a limit in reducing the influence that may occur between the radio circuit and the control circuit.

  It is an object of the present invention to provide a portable terminal device that can reduce interference between electronic components mounted on a circuit board and can be downsized.

  The portable terminal device of the present invention includes a housing, a circuit board disposed in the housing, on which a wireless circuit and a control circuit are mounted, and disposed in the housing, the wireless circuit and the control And a battery for supplying a power supply voltage to the circuit, wherein the circuit board includes a first mounting unit on which the wireless circuit is disposed, and a second mounting unit on which the control circuit is disposed. A notch portion formed between the first mounting portion and the second mounting portion and partitioning the first mounting portion and the second mounting portion; one end side of the first mounting portion; An intermediate portion formed adjacent to the cutout portion is connected to one end side of the second mounting portion, and the battery is disposed in the cutout portion.

  The intermediate mounting unit is provided with a power supply circuit that converts a power supply voltage supplied from the battery into a predetermined power supply voltage and supplies the converted power supply voltage to the radio circuit and the control circuit. It is preferable.

  In addition, it is preferable that the battery has a power supply terminal disposed at a portion facing the intermediate mounting portion.

  Moreover, it is preferable that a feeding point of an antenna connected to the wireless circuit is disposed in the first mounting portion.

  In addition, it is preferable that a signal line for transmitting and receiving signals to and from the electrical component is connected to the other end side of the second mounting portion.

  The circuit board is preferably formed in a U shape by the first mounting portion, the second mounting portion, and the intermediate mounting portion.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the interference of the electronic components mounted in a circuit board, the portable terminal device which enabled size reduction of a housing | casing can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Hereinafter, although the mobile phone 1 will be described as a mobile terminal device, the present invention is not limited to this. For example, a PHS (registered trademark: Personal Handyphone System), a PDA (Personal Digital Assistant), a portable navigation device, or the like may be used.

  In the present embodiment, a description is given using a mobile phone (so-called straight type) in which the operation unit side body and the display unit side body are arranged in one housing, but the present invention is not limited thereto. Absent. For example, the mobile phone 1 is a folding type that can be opened and closed from a state in which the operation unit side body and the display unit side body are overlapped, or the operation unit side body and the display unit side body are overlapped. The slide type that allows one case to slide in one direction from the closed state, the rotary type that rotates one case around an axis along the overlapping direction, and the display on the operation unit side case The part side housing | casing may be connected via the biaxial hinge.

  FIG. 1A is an external perspective view of a mobile phone 1 that is an example of a mobile terminal device according to the present invention as viewed from the front panel 2 side, and FIG. 1B is a cross-sectional view taken along line A- in FIG. It is A sectional drawing. FIG. 2 is an external perspective view of the mobile phone 1 as viewed from the rear panel 3 side. FIG. 3 is a functional block diagram showing functions of the mobile phone 1. FIG. 4 is an exploded perspective view showing internal members constituting the mobile phone 1. FIG. 5 is a schematic diagram showing a mounting state of electronic components in the mobile phone 1. FIG. 6 is a schematic diagram showing a mounting state of electronic components in a conventional mobile phone. FIG. 7 is a schematic view showing a molded state of the first circuit board.

  As shown in FIGS. 1 and 2, the mobile phone 1 according to the present embodiment includes a front case 2 and a rear case 3, and a so-called straight type in which an operation unit and a display unit are arranged in one housing. Mobile phone 1. And each of the display part side area | region where a display part is arrange | positioned, and the operation part side area | region where an operation part is arrange | positioned are provided in the front case 2 side.

  An LCD (Liquid Crystal Display) display unit 21 for displaying various types of information and a speaker 22 for outputting the voice of the other party of the call are exposed in the display unit side area.

  Further, the operation key group 11 and the microphone 26 to which the voice uttered by the user of the mobile phone 1 is input are exposed in the operation unit side area. The operation key group 11 includes a function setting operation button 23 for operating various settings, various functions such as a telephone directory function and a mail function, and an input operation for inputting a telephone number and characters such as mail. The button 24 and a determination operation button 25 for performing determination and scrolling in various operations are configured.

  As shown in FIGS. 1B and 2, the rear case 3 is formed with a battery housing portion 31 for attaching and detaching the battery 46 at the central portion in the operation portion side region. Covered by a battery lid 32. The battery 46 in the present embodiment is a cylindrical one, and for example, an AA battery type battery can be used.

  Here, FIG. 3 shows a functional block diagram showing functions of the mobile phone 1. As shown in FIG. 3, the mobile phone 1 includes an operation unit (operation key group) 11, a microphone 26, a main antenna 40, an RF circuit unit 41, an LCD control unit 42, an audio processing unit 43, a memory 44, a CPU (control unit) 45, a power supply unit (battery) 46, and a power supply circuit unit (control IC) 47 are provided in the operation unit side area, and the LCD display unit 21, speaker 22, and driver IC 23. Are provided in the display side area.

  The main antenna 40 communicates with an external device in a first use frequency band (for example, 800 MHz). In the present embodiment, the 800 MHz frequency band is used as the first used frequency band, but other frequency bands may be used. Further, the main antenna 40 may have a so-called dual band compatible type that can support other used frequency bands (for example, 2 GHz) in addition to the first used frequency band.

  The RF circuit unit 41 demodulates the signal received by the main antenna 40 and supplies the processed signal to the CPU 45. Then, the signal supplied from the CPU 45 is modulated and transmitted to an external device (base station) via the main antenna 40.

  The LCD control unit 42 performs predetermined image processing under the control of the CPU 45, and outputs the processed image data to the driver IC 23. The driver IC 23 stores the image data supplied from the LCD control unit 42 in the frame memory and outputs it to the LCD display unit 21 at a predetermined timing.

  The sound processing unit 43 performs predetermined sound processing on the signal supplied from the RF circuit unit 41 under the control of the CPU 45 and outputs the processed signal to the speaker 22. The speaker 22 outputs the signal supplied from the sound processing unit 43 to the outside. In addition, the sound processing unit 43 processes a signal input from the microphone 26 under the control of the CPU 45 and outputs the processed signal to the RF circuit unit 41. Then, the RF circuit unit 41 performs a predetermined process on the signal supplied from the audio processing unit 43 and outputs the processed signal to the main antenna 40.

  Next, the basic internal structure of the mobile phone 1 will be described with reference to FIG. As shown in FIG. 4, the mobile phone 1 includes a front case 2, a key sheet 50 that constitutes the operation key group 11, a flexible wiring board 51, a reference potential pattern layer, and an RF (Radio Frequency) module for the mobile phone. A first circuit board 60 on which various electronic components such as a liquid crystal panel and a second circuit board 70 on which a driving circuit for driving the liquid crystal panel and the like are arranged, a main antenna 40, and a battery housing portion 31 are formed. The rear case 3 and a cylindrical battery 46 are provided.

  The front case 2 and the rear case 3 are arranged so that their concave inner surfaces face each other with the above-mentioned members inside, and are joined so that their outer peripheral edges overlap.

  The front case 2 has a display hole 21a and key holes 23a, 24a, and 25a. The LCD display unit 21 disposed on the second circuit board 70 is exposed from the display unit hole 21a, and the operation key group formed on the key sheet 50 is formed from each of the key holes 23a, 24a, and 25a. 11 (function setting operation button 23, input operation button 24, determination operation button 25) is configured to be exposed.

  The key sheet 50 is configured by attaching the operation key group 11 to the surface of a silicon rubber sheet with an adhesive. The operation key group 11 is disposed so as to be exposed from the key holes 23 a, 24 a, 25 a formed in the front case 2, and is disposed at a position facing the key switch 51 a in the flexible wiring board 51.

  The flexible wiring board 51 has a plurality of key switches 51a on the surface on the front case 2 side. The key switch 51a of the flexible wiring board 51 has a structure having a metal dome of a metal plate that is three-dimensionally curved in a bowl shape, and the metal dome is pressed when the apex of the bowl shape is pressed. Then, the switch terminal formed in an electric circuit (not shown) printed on the surface of the flexible wiring board 51 is brought into electrical contact with the switch terminal. In addition, the flexible wiring board 51 is used in which wiring is sandwiched between a plurality of insulating films.

  The outer shape of the flexible wiring board 51 on the rear case 3 side is formed to be slightly wider than the flexible wiring board 51 and curved toward the front case 2 along the inner surface of the front case 2. A metal (or resin) support frame plate (not shown) is disposed. The outer peripheral portion of the support frame plate is fixed to the inner surface of the front case 2 by screwing or the like. When the operation key group 11 exposed from the key holes 23a, 24a, 25a is pressed, the key sheet 50, The structure is such that stress to the inside of the casing transmitted through the flexible wiring board 51 is received by the support frame plate. Thus, the operation key group 11 is operated without causing the user to feel uncomfortable.

  The support frame plate is formed integrally with the front case 2, that is, the operation key group 11 and the flexible wiring board 51 can be arranged on the outer surface side of the front case 2 instead of the key holes 23a, 24a, 25a. It is good also as a structure which forms a recessed part in the outer surface side of the front case 2. FIG. In this case, the stress on the inside of the housing when the operation key group 11 is pressed is received by the front case 2.

  The first circuit board 60 is formed in a vertically long shape in which a wireless circuit (analog processing circuit) 61a is mounted and formed in a vertically long shape, and a control circuit (digital processing circuit) 62a is mounted in a vertically long shape. A mounting portion 62, a notch portion 64 that is formed between the first mounting portion 61 and the second mounting portion 62, and partitions the first mounting portion 61 and the second mounting portion 62; An intermediate mounting portion 63 that connects the one end side and the one end side of the second mounting portion 62 and mounts the power supply circuit portion 47 is provided. In other words, the first circuit board 60 has a U-shape composed of an intermediate mounting portion 63 that connects the first mounting portion 61 and the second mounting portion 62 with the first mounting portion 61 and the second mounting portion 62 as arms. It is formed into a shape.

  The first mounting unit 61 is mounted with a circuit block including an analog processing system circuit such as the wireless circuit 61a. Examples of other circuits in the analog processing system include a modem circuit and a strobe circuit. In addition, the first mounting portion 61 is provided with an antenna feeding terminal (hollow wire supply point) 65 connected to the main antenna 40. The antenna power supply terminal 65 is provided at an end portion in the longitudinal direction of the first mounting portion 65, and the antenna power supply terminal 65 provided on the power supply circuit block side is connected to the main antenna 40. In addition, the antenna feeding terminal 67 provided on the upper end side of the first mounting portion 61 is connected to a sub antenna (not shown) such as a GPS antenna.

  In addition, the second mounting unit 62 is mounted with a circuit block including a digital processing system circuit such as the audio processing unit (D / A converter) 43. Examples of other circuits in the digital processing system include a DSP circuit and an image processing circuit.

  A power supply circuit block including a power supply circuit 47 is mounted on the intermediate mounting portion 63 and connected to a battery 46 described later.

  Electronic components such as a liquid crystal panel, a drive circuit (not shown) for driving the liquid crystal panel, and the like are mounted on the second circuit board 70. In addition, the drive circuit and the like mounted on the second circuit board 70 are electrically connected to the power supply circuit 47 by a predetermined relay cable 66 via the second mounting portion 62 of the first circuit board 60. That is, the drive circuit and the like mounted on the second circuit board 70 on the other end side in the second mounting portion 62 are electrically connected to the power supply circuit 47.

  As described above, the driving circuit and the like mounted on the second circuit board 70 and the power supply circuit 47 are connected to the first mounting portion 61 by using the relay cable 66 and connected to the front end side of the second mounting portion 62. It is possible to dispose the antenna feeding terminals 65 and 67 and the relay cable 66 that are separated from each other. This eliminates the need to provide ground shields at the antenna power supply terminals 65 and 67 for blocking the influence of harmonics generated by the relay cable 66 of the power supply voltage supplied to the second circuit board 70 side.

  The main antenna 40 is configured by arranging an antenna element 40a formed in a predetermined shape by a strip-shaped sheet metal on a base. The main antenna 40 is disposed at the end opposite to the side where the first circuit board 60 and the second circuit board 70 are connected, and is disposed at both ends in the longitudinal direction of the first mounting portion 61. Power is supplied from the first circuit board 60 via the power supply terminal 65. The antenna element 40 a of the main antenna 40 is fed from the first circuit board 60 via the antenna feeding terminal 65 and is connected to each electronic component such as an RF module on the first circuit board 60.

  A battery housing 31 is disposed in the rear case 3. The battery housing portion 31 is formed in a substantially box shape including a pair of ribs extending from the rear case 3 in the thickness direction (front case side) of the mobile phone 1, and the flexible wiring board 51 (or the above-described support frame plate). ) Is in contact with a part of. Further, the battery housing part 31 is disposed in a notch part 64 configured between the first mounting part 61 and the second mounting part 62 in the first circuit board 60.

  In the rear case 3, the battery lid 32 is disposed so as to close the opening of the battery accommodating portion 31 in a state where the battery 46 is accommodated, thereby preventing the battery 46 from falling off.

  A magnetic antenna (not shown) for non-contact communication is disposed near the battery housing 31. The magnetic antenna is disposed on the outer periphery of the battery housing 31. In the present embodiment, the magnetic antenna is disposed on the outer peripheral portion of the battery accommodating portion 31, but the present invention is not limited to this. For example, the battery lid 32 may be disposed.

  The battery 46 is detachably accommodated in the battery accommodating portion 31 through an opening formed in the rear case 3. That is, the battery 46 is disposed in the notch portion 64 configured between the first mounting portion 61 and the second mounting portion 62. The battery 46 is disposed so as to face the power supply circuit 47 of the power supply circuit block provided in the intermediate mounting portion 63 adjacent to the notch portion 64, and the power supply circuit via the battery feeding point 46 a of the battery 47. 47.

  With this configuration, the cellular phone 1 can directly connect the battery 47 to the power supply circuit 47 without using the power supply relay connector. Further, since the feedback current of each circuit block is not affected by the common impedance that occurs when the power supply relay connector is connected, there is no possibility that the performance of each element is deteriorated.

  The battery 46 has a predetermined strength because the outer peripheral surface is covered with a metal jacket in a state where the battery element is filled therein. Therefore, by arranging the battery 46 in a state in which the battery 46 is in contact with each of the front case 2 and the rear case 3 in the battery housing portion 31 formed at the center of the mobile phone 1, the thickness direction of the mobile phone 1 is determined. It is possible to increase the strength at. That is, it is possible to obtain a predetermined strength without using a shield case used in a conventional mobile phone.

  Further, since the battery 46 formed in a cylindrical shape is not configured to be applied with pressure to form a flat body, for example, it is difficult to cause deformation such as expansion due to heat during use. Therefore, in the case where the battery 46 is disposed inside the mobile phone 1, a design that takes into consideration a bulging region that takes into account deformation due to expansion of the battery 46 or the like is not required, and the thickness can be further reduced.

  Furthermore, the battery 46 can obtain a highly efficient charge / discharge characteristic by using a cylindrical battery, and the deterioration of the electrode is also reduced.

  In addition, by arranging the cylindrical battery 46 in the approximate center of the mobile phone 1, the thickness of the board, components, and shield is partially considered compared to the conventional mounting thickness in which box-shaped batteries are stacked and arranged. Since there is a portion (a substrate disposed on both sides of the battery 46) that can be omitted, it is possible to easily reduce the thickness.

  Further, for example, as shown in FIG. 5A, a first mounting unit 61 in which a wireless circuit (analog processing circuit) 61a of the first circuit board 60 is arranged and a control circuit (digital processing circuit) 62a are arranged. Since the slit portion 64 is provided between the second mounting portion 62, the mobile phone 1 can share the grounds of the radio circuit 61a and the control circuit 62a, eliminates the need for means for adjusting impedance, and reduces costs. Can be achieved.

  Further, for example, the first circuit board 60 is provided between the first mounting part 61 where the radio circuit (analog processing circuit) is arranged and the second mounting part 62 where the control circuit (digital processing circuit) is arranged. Since the battery 46 covered with the metal jacket is disposed in the slit portion 64, the mobile phone 1 provides a path through which unnecessary radiated radio waves generated by the control circuit (digital processing circuit) enter the wireless circuit (analog processing circuit). It can block suitably.

  Further, for example, as shown in FIG. 5B, by arranging the battery 46 in the slit portion 64, the mobile phone 1 can set the total thickness in the electronic component mounting portion of the mobile phone 1 to the thickness of the battery 46 (battery diameter). ). That is, the first circuit board 60 can arrange electronic components in the thickness direction within the diameter range of the battery 46 on the first and second mounting portions 61a and 62a. There is no need to reduce the thickness, and performance degradation caused by reducing the thickness of the electronic component itself can be reduced.

  In addition, for example, the cellular phone 1 can be improved in design and operability because the casing shape can be changed from a square shape like a conventional cellular phone to an oval shape as shown in FIG. become.

  Further, for example, as shown in FIG. 5C, the battery 46 is disposed in the slit portion 64 so that the power supply point (positive electrode and negative electrode) 46a of the battery 46 and the power circuit 47 are in direct contact with each other. Therefore, the mobile phone 1 can suppress the occurrence of a common impedance mismatch between the battery 46 and the power supply circuit 47.

  Further, for example, since the relay cable 66 is disposed at a position away from the antenna power supply terminal (hollow wire supply point) 65, the antenna power supply terminal (hollow wire supply point) 65 is not easily affected by noise generated in the relay cable 66. Thus, the mobile phone 1 does not need to provide a ground shield at the antenna power supply terminal (hollow wire supply point) 65.

  Further, in the present embodiment, in order to form the first circuit board 60 in a U shape, when a plurality of U-shaped substrates 60a, 60b,. It is considered that the number of cuts is worse than that of the conventional substrate 100.

  However, for example, as shown in FIG. 7, the intermediate mounting portions 63 a and 63 b are opposed to each other and the second mounting portions 62 a and 62 b (first mounting portions 61 a and 61 b) from the portion corresponding to the notches 64 a and 64 b. As a result, the deterioration of the number of cuts from the collective substrate 200 can be eliminated.

  In the present embodiment, the wireless circuit 61a is arranged in the first mounting unit 61. However, the present invention is not limited to this. For example, an acoustic circuit may be arranged instead of the wireless circuit 61a. By arranging the acoustic circuit, it can be used as a portable music terminal.

The external appearance perspective view which looked at the mobile telephone 1 which is an example of the portable terminal device which concerns on this invention from the front side is shown. It is the external appearance perspective view which looked at the mobile telephone 1 from the rear panel side. 3 is a functional block diagram showing functions of the mobile phone 1. FIG. 2 is an exploded perspective view showing an internal structure of the mobile phone 1. FIG. FIG. 3 is a schematic diagram showing a mounting state of electronic components in the mobile phone 1. It is a schematic diagram which shows the mounting state of the electronic component in the conventional mobile phone. It is a schematic diagram which shows the molding state of a 1st circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone 2 Front case 3 Rear case 46 Battery 47 Power supply circuit part 60 1st circuit board 61 1st mounting part 61a Radio circuit 62 2nd mounting part 62a Control circuit 63 Intermediate mounting part 64 Notch part 70 2nd circuit board

Claims (6)

A housing,
A circuit board disposed in the housing and mounted with a radio circuit and a control circuit;
A battery that is disposed inside the housing and supplies a power supply voltage to the wireless circuit and the control circuit,
The circuit board is
A first mounting part in which the wireless circuit is disposed;
A second mounting part in which the control circuit is disposed;
A notch portion formed between the first mounting portion and the second mounting portion and partitioning the first mounting portion and the second mounting portion;
An intermediate mounting portion formed by connecting one end side of the first mounting portion and one end side of the second mounting portion and being formed adjacent to the notch portion;
The portable terminal device, wherein the battery is disposed in the notch.   The power supply circuit that converts the power supply voltage supplied from the battery into a predetermined power supply voltage and supplies the converted power supply voltage to the radio circuit and the control circuit is disposed in the intermediate mounting unit. The mobile terminal device according to 1.   The portable terminal device according to claim 2, wherein the battery is provided with a power supply terminal at a portion facing the intermediate mounting portion.   The portable terminal device according to any one of claims 1 to 3, wherein a feeding point of an antenna connected to the wireless circuit is disposed in the first mounting unit.   5. The portable terminal device according to claim 1, wherein a signal line for transmitting and receiving signals to and from an electrical component is connected to the other end side of the second mounting portion.   6. The mobile terminal device according to claim 1, wherein the circuit board is formed in a U shape by the first mounting portion, the second mounting portion, and the intermediate mounting portion.

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