JP2008078386A - Portable electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide portable electronic equipment which effectively prevents the occurrence of a situation that causes a malfunction or circuit breakage caused by a state, in which static electricity directly goes into a circuit to be protected from static electricity, while reducing costs and man-hours required for the prevention. <P>SOLUTION: The portable electronic equipment is provided with a casing 3 or a plurality of members 3a, 3b, and 3d constituting an exterior fittingly attached to the casing, electronic circuits 6, 10, 11, and 12 stored inside the casing 3, and a flexible wiring board 8 that is stored inside the casing 3, arranged inside each fitting part of two mutually-fitted members 3a, 3b and 3b, 3d of a plurality of the members, and connected to each electronic circuit. The flexible wiring board 8 has each ground part G1, G2 arranged near each circuit 11, 12, to be protected from static electricity, of the electronic circuits. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a housing composed of a plurality of members, an electronic circuit housed in the housing, and two members that are housed in the housing and that fit into each other among the plurality of members constituting the housing. The present invention relates to a portable electronic device including a flexible wiring board disposed inside a fitting portion of a member and connected to an electronic circuit.

  For example, a mobile phone is known as the portable electronic device as described above, and a conventional mobile phone includes, for example, a liquid crystal side housing and, for example, a character input side housing. The character input side case is connected to the liquid crystal side case or the circuit board accommodated in the character input side case by a connecting mechanism such as a hinge part, and the electronic component is separated from the circuit board. A flexible wiring board is also used for electrical connection with an electronic component (see, for example, Patent Document 1), and the flexible wiring board is fitted to the front case and the rear case constituting the casing, the casing, and the casing. In some cases, the cover is disposed inside a fitting portion of two members that fit together such as a cover as an exterior.

By the way, in such a cellular phone, a plurality of members constituting the housing, such as a fitting portion between the front case and the rear case constituting the housing and a fitting portion between the housing and a cover fitted thereto. There are cases where there is a circuit that should be protected from static electricity among the electronic circuits in the housing near the inside of the fitting part of the two members that fit together. A ground pattern is provided along the edge, and a part of the resist layer that protects the circuit pattern surface of the circuit board is peeled off to expose the ground pattern, or vapor deposition or conductive coating is applied to the rear surface of the casing near the fitting portion. An elastic tab with metal conductors, sheet metal members, etc., placed on the ground pattern of the circuit board when conductors are provided and the front case and rear case constituting the housing are fitted together To prevent static electricity from entering the circuit that should be protected from static electricity by guiding static electricity that enters the housing from the outside through the fitting part to the ground pattern or the conductor. .
JP 2005-051430 A

  However, when the ground pattern is provided along the edge of the circuit board as in the former case, the height of the fitting portion matches the edge of the circuit board or the circuit to be protected from static electricity in the vicinity of the edge. Static electricity can be induced to the ground pattern as expected if it is sufficiently close to the height of the circuit board. If there is a part and the part is close to the mating part or the mating part is located above the circuit board, static electricity cannot be induced in the ground pattern provided along the edge of the circuit board. There was a problem that static electricity jumped directly into the circuit to be protected, causing malfunction and circuit destruction.

  In addition, as in the latter case, the front case and the rear case constituting the casing are provided by providing a conductor by performing vapor deposition, conductive coating, or the like on the back of the casing near the fitting portion, or by arranging a metal tape or sheet metal member. When these are brought into contact with an elastic tab or the like provided on the ground pattern of the circuit board, there is a problem that the manufacturing cost and man-hour increase.

  An object of the present invention is to advantageously solve the above-described problem, and a portable electronic device according to the present invention includes a housing composed of a plurality of members, and an electronic circuit housed in the housing. A flexible wiring board that is housed in the housing and disposed inside a fitting portion of two members that fit together among the plurality of members constituting the housing and connected to the electronic circuit; The flexible wiring board has a ground portion disposed in the vicinity of a circuit to be protected from static electricity in the electronic circuit.

  In the portable electronic device according to the present invention, the flexible wiring board is arranged inside the fitting portion of two members that fit together among a plurality of members constituting the housing and is connected to the electronic circuit in the housing However, since the electronic circuit has a ground portion disposed in the vicinity of the circuit to be protected from static electricity, the static electricity that passes through the fitting portion and enters the housing from the outside is caused by the ground portion of the flexible wiring board. Be guided to.

  Therefore, according to the portable electronic device of the present invention, it is possible to effectively prevent a situation in which static electricity jumps directly into a circuit to be protected from static electricity and causes malfunction or circuit destruction. In addition, a conductor is provided by performing vapor deposition, conductive coating, etc. on the back of the housing near the fitting portion, or by arranging a metal tape or sheet metal member, or by providing an elastic tab or the like on the ground pattern of the circuit board. Therefore, it is possible to reduce costs and man-hours for manufacturing a structure that induces static electricity.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view taken along the line AA in FIG. 2, showing the structure of the character input side housing of the foldable mobile phone as an embodiment of the portable electronic device of the present invention. FIG. 3 is a perspective view showing the appearance of the mobile phone according to the above embodiment as viewed from the character input side housing side with the liquid crystal side housing and the character input side housing closed, and FIG. 3 shows the mobile phone according to the above embodiment. FIG. 4 is an exploded perspective view showing the structure of the character input side case of the telephone, and FIG. 4 is a plan view showing the key FPC in the character input side case of the mobile phone of the above-described embodiment. The mobile telephone of the said Example is shown.

  The cellular phone 1 according to this embodiment includes a liquid crystal side housing 2 and a character input side housing 3, and the liquid crystal side housing 2 is configured by fitting and fixing a front case 2a and a rear case 2b to each other. The character input side housing 3 is configured such that the front case 3a and the rear case 3b are fitted to each other and fixed with screws. The liquid crystal side housing 2 and the character input side housing 3 are: They can be opened and closed with each other via a hinge portion 4 as a connecting mechanism.

  The liquid crystal housing 2 includes a substrate (not shown) inside the front case 2a and the rear case 2b, and a liquid crystal display unit (not shown) installed on the surface of the substrate is exposed from the front case 2a. Various electronic components such as a speaker are mounted and electrically connected to the substrate. On the other hand, the character input side housing 3 has a battery housing portion 5 inside the front case 3a and the rear case 3b and a circuit board 6 therein, and a metal frame on the surface (the lower surface in FIG. 1) of the circuit board 6 7, a key flexible board (key FPC) 8 that mounts a plurality of key switches and constitutes a key board is supported, and a key button sheet 9 that is placed on the key FPC 8 is displayed from the front case 3a. I'm out. In addition, various electronic components such as a microphone are mounted and electrically connected to the circuit board 6.

  In the character input side housing 3, a sub-board 10 is disposed so as to overlap a surface (an upper surface in FIG. 1) of the circuit board 6 facing the rear case 3b. An RFID chip 11 for “Felica (trademark)” which is a payment service using a telephone is mounted, and an infrared communication chip 12 having a light emitting unit 12a and a light receiving unit 12b for infrared communication (IrDA) is also mounted. These chips 11 and 12 are located close to the fitting portion 3c between the front case 3a and the rear case 3b of the character input side housing 3.

  Further, an opening (not shown) is provided at a position (upward position in FIG. 1) of the rear case 3b of the character input side housing 3 facing the sub-board 10, and the rear case 3b is provided so as to cover the opening. As shown in FIGS. 1 to 3, a cover 3d as an exterior is fitted, and on this cover 3d, the light emitting unit 12a and the light receiving unit 12b of the infrared communication chip 12 perform infrared communication with an external device. An infrared transmission window 3e is provided for performing. In this specification, the cover 3d and the infrared transmission window 3e as the exterior are also considered as members constituting the casing of the mobile phone.

  Furthermore, the key FPC 8 includes a first extension portion 8b having a connector 8a for electrical connection with the circuit board 6 and a connector 8c for electrical connection with the sub-board 10 as shown in FIG. As shown in FIG. 3, the first extension 8b is bent once and the connector 8a is directed to the circuit board 6, as shown in FIG. The connector 8a is connected to a connector (not shown) on the lower surface of the circuit board 6 in FIG. Further, the second extension 8d is bent in the reverse L shape in FIG. 4 so that the tip of the horizontal arm portion is bent away from the connector 8c in FIG. 3, the connector 8c is directed to the sub-board 10 by being bent twice in cross section as shown in FIG. 3, and the connector 8c is connected to the connector on the upper surface in FIG. 13 is connected.

  Therefore, in the cellular phone 1 of this embodiment, a structure for inducing static electricity using the second extension 8d of the key FPC 8 is configured. That is, a signal line layer (not shown) made of a conductor pattern having a plurality of signal lines is formed on the surface of the second extension portion 8d of the key FPC 8 facing in FIG. 4 (below the paper surface), Further, in FIG. 4, the surface of the second extension portion 8d facing forward (above the paper surface) has a substantially rectangular ground portion G1 covering the base of the horizontal arm portion in FIG. In FIG. 4, a ground layer made of a conductor pattern having a substantially rectangular ground portion G <b> 2 that covers the upper portion of the vertical leg portion is formed, and the ground layer has a width that covers the plurality of signal lines. The second extension 8 d is electrically connected to a ground line among the signal lines via a conductor in a through hole (not shown), and is electrically connected to the ground pattern of the circuit board 6.

  Further, although the signal line layer and the ground layer of the second extension 8d of the key FPC 8 are each covered with a resist layer as a surface layer made of an insulator, only the portion covering the ground part G1 and the ground part G2 is provided. The resist layer is removed, so that the ground portion G1 and the ground portion G2 of the ground layer are exposed. As shown in FIG. 1, the ground portion G1 has a fitting portion between the opening of the rear case 3b and the cover 3d, and the cover 3d and the infrared light transmission than the RFID chip 11 and the infrared communication chip 12 on the sub-board 10. The ground part G2 is located closer to the fitting part 3c between the front case 3a and the rear case 3b than the RFID chip 11 and the infrared communication chip 12 on the sub-board 10 are located close to the fitting part with the window 3e. Is located.

  In the cellular phone 1 of this embodiment, the fitting portion 3c between the front case 3a and the rear case 3b and the opening of the rear case 3b and the cover 3d, which respectively constitute the character input side housing 3, are formed. A key FPC 8 disposed inside the fitting portion and the fitting portion between the cover 3d and the infrared transmission window 3e and connected to the circuit board 6 and the sub board 10 in the character input side housing 3 is connected to the circuit board 6 from the circuit board 6. The ground portions G1 and G2 of the second extension portion 8d bent so as to surround the sub-board 10 are disposed on the sub-board 10 that is spaced apart and in the vicinity of the RFID chip 11 and the infrared communication chip 12 to be protected from static electricity. Therefore, static electricity that passes through the fitting portions and enters the character input side housing 3 from the outside is guided to the ground portions G1 and G2 of the key FPC8. Further, static electricity that enters from between the cover 3d and the infrared transmission window 3e is also guided to the ground portion G1 of the key FPC 8.

  Therefore, according to the mobile phone 1 of this embodiment, it is possible to effectively prevent a situation in which static electricity jumps directly into the RFID chip 11 and the infrared communication chip 12 to be protected from static electricity and the circuits in the vicinity thereof to cause malfunction or circuit destruction. Can do. In addition, the rear surface of the housing near each fitting portion is subjected to vapor deposition, conductive coating, or the like, or a metal tape or sheet metal member is disposed to provide a conductor, or a ground pattern of the circuit board 6 is provided with an elastic tab or the like. Therefore, it is not necessary to make a contact with each other, so that the cost and man-hour for manufacturing the structure for inducing static electricity can be reduced.

  Further, according to the mobile phone 1 of this embodiment, the RFID chip 11 and the infrared communication chip 12 to be protected from static electricity and the vicinity thereof are provided on the surface of the key FPC 8 opposite to the surface on which the ground portions G1 and G2 are formed. Therefore, the static electricity that passes through the fitting portions and enters the character input side housing 3 from the outside is more reliably guided to the ground portions G1 and G2 of the key FPC8. Can do.

  Furthermore, according to the mobile phone 1 of this embodiment, the key FPC 8 has the second extension 8d as a bent portion in which the ground portions G1 and G2 are arranged, and the second extension 8d is protected from static electricity. Since the RFID chip 11 and the infrared communication chip 12 to be covered and the circuit in the vicinity of the RFID chip 11 and the circuit in the vicinity thereof are covered, static electricity entering the character input side housing 3 from the outside through the fitting portions is It is possible to guide more reliably to the ground portions G1 and G2 of the key FPC8.

  Furthermore, according to the mobile phone 1 of this embodiment, the second extension 8d of the key FPC 8 includes a signal line layer having a signal line, a ground layer having ground portions G1 and G2, and a resist layer as a surface layer. The ground layer has a width that covers the signal line, and the resist layer is partially removed to expose the ground portions G1 and G2 of the ground layer. Can be configured easily.

  According to the cellular phone 1 of this embodiment, the ground portions G1 and G2 are conductors provided on the surface of the second extension 8d so as to cover the signal line of the second extension 8d of the key FPC 8. Since it is formed by a pattern, the signal line of the second extension 8d of the key FPC 8 can be protected from static electricity.

  As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned example, and can be changed suitably within the statement range of a claim, for example, the circuit which should be protected from static electricity, A tall component mounted on the circuit board 6 may be used, or a circuit in the vicinity of the fitting portion between the front case 2a and the rear case 2b of the liquid crystal side housing 2 may be used.

  The present invention can be applied not only to a folding type but also to a horizontal rotation type or a biaxial hinge type mobile phone, and further to a portable electronic device such as a palmtop computer other than the mobile phone. .

  Thus, according to the portable electronic device of the present invention, it is possible to effectively prevent a situation in which static electricity jumps directly into a circuit to be protected from static electricity and causes malfunction or circuit destruction. In addition, a conductor is provided by performing vapor deposition, conductive coating, etc. on the back of the housing near the fitting portion, or by arranging a metal tape or sheet metal member, or by providing an elastic tab or the like on the ground pattern of the circuit board. Therefore, it is possible to reduce costs and man-hours for manufacturing a structure that induces static electricity.

It is sectional drawing which follows the AA line in FIG. 2 which shows the structure of the character input side housing | casing of the foldable mobile telephone as one Example of the electronic device of this invention. It is a perspective view which shows the external appearance of the mobile telephone of the said Example seeing from the character input side housing | casing side in the state which closed the liquid crystal side housing | casing and the character input side housing | casing mutually. It is a disassembled perspective view which shows the structure of the character input side housing | casing of the mobile telephone of the said Example. It is a top view which expand | deploys and shows the key FPC in the character input side housing | casing of the mobile telephone of the said Example.

Explanation of symbols

1 Cellular phone 2 Liquid crystal side housing (housing)
2a, 3a Front case (housing)
2b, 3b Rear case (housing)
3 Character input side case (case)
3c Fitting part 3d Cover (housing)
3e Infrared transparent window (housing)
4 Hinge part 5 Battery compartment 6 Circuit board 7 Metal frame 8 Key FPC (flexible wiring board)
8a, 8c connector 8b first extension 8d second extension 9 key button sheet 10 sub-board 11 RFID chip 12 infrared communication chip 12a light emitting part 12b light receiving part 13 connector G1, G2 ground part

Claims (7)

A housing composed of a plurality of members;
An electronic circuit housed in the housing;
A flexible wiring board that is housed in the housing and disposed inside a fitting portion of two members that are fitted to each other among the plurality of members constituting the housing, and connected to the electronic circuit;
With
A portable electronic device, wherein the flexible wiring board has a ground portion disposed in the vicinity of a circuit to be protected from static electricity in the electronic circuit.   The portable electronic device according to claim 1, wherein a circuit to be protected from static electricity is located on a surface of the flexible wiring board opposite to a surface on which the ground portion is formed. The flexible wiring board has a bent portion in which the ground portion is disposed,
The portable electronic device according to claim 1, wherein the bent portion is disposed so as to cover a circuit to be protected from the static electricity.   The portable electronic device according to claim 1, wherein the circuit to be protected from static electricity includes an RFID chip.   5. The portable electronic device according to claim 1, wherein the circuit to be protected from static electricity includes an IrDA light emitting unit and a light receiving unit. The flexible wiring board includes a signal line layer having a signal line, a ground layer having a ground part, and a surface layer,
The ground layer has a width that covers the signal line,
The portable electronic device according to claim 1, wherein the surface layer is partially removed to at least partially expose the ground layer.   The portable type according to any one of claims 1 to 6, wherein the ground portion is formed by a conductive portion provided on a surface of the flexible wiring board so as to cover a signal line of the flexible wiring board. Electronics.

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