JP2007227799A - Flexible wiring board and mobile electronic equipment using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible wiring board capable of maintaining a bent state of a bent wiring with a simple structure, and to provide a mobile radio set using the same. <P>SOLUTION: The flexible wiring board is constituted by providing a routing wiring 66 with the bent wiring 67 and a hook engagement 71, and also providing a cut 67a that the hook engagement 71 is made to engage when the bent wiring 67 is bent at a peripheral edge of the bent wiring 67. Further, a mobile phone 1 is constituted by electrically connecting an electric component or electronic component such as a camera 61 to a circuit board 21 provided in a case 2 by using the flexible wiring board 65. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flexible wiring board having a bent wiring portion, and a portable electronic device such as a mobile phone, a PDA (Personal Digital Assistants), and a digital camera using the same.

  Conventionally, as an electrical connection means, a flexible wiring board in which a predetermined pattern of wiring made of copper foil is sandwiched between flexible base films made of polyimide resin, for example.

  The flexible wiring board has a routing wiring portion on which wiring is formed, and a connection terminal portion that is provided in the routing wiring portion and is electrically connected to the wiring, and extends from the routing wiring portion as necessary. Some of them have a bent wiring portion provided so as to be foldable, and this bent wiring portion is formed with a part of the wiring formed in the lead-out wiring portion, and an IC package, a capacitor, and a resistor are formed in the bent wiring portion. There are some which are mounted with various electronic components such as connectors and connectors constituting the connection terminal portion.

  The flexible wiring board having such a bent wiring portion is used by bending the bent wiring portion in accordance with the arrangement between the connection parts or bending the flexible wiring board to reduce the space occupied by the flexible wiring board. It is used for various devices.

On the other hand, portable electronic devices such as mobile phones, PDAs (Personal Digital Assistants), digital cameras, etc., circuit boards, liquid crystal displays in which various electronic components such as IC packages, capacitors, resistors, etc. are mounted in the case forming the main body And a display device such as an organic EL display, a key sheet having a key sheet having a plurality of operation keys and a plurality of switches that are switched on / off by being pressed by the keys, and an electronic component such as a camera unit. For example, as in Patent Document 1, the above-described flexible wiring board is used for electrical connection between a circuit board and a display device, or the above-described flexible wiring board is used for electrical connection between a circuit board and a key operation unit or a camera. It was used.
JP 2005-109132 A

  By the way, although a flexible wiring board has flexibility, there existed a subject that it was difficult to maintain the state bent by the repulsion of a film or wiring.

  Therefore, in the assembling process of the portable electronic device that requires precise component arrangement, it is difficult to maintain the bent state of the flexible wiring board, resulting in a problem that the assembling work becomes complicated.

  Therefore, although a double-sided adhesive tape is used as a means for maintaining the folded state, in this case, it is desired to slightly shift the position due to the problem of accuracy between components, components and circuit board, or components and case. Sometimes the bent wiring part is fixed, so the positions of the electronic components and connection terminal parts mounted on the bent wiring part of the flexible wiring board cannot be moved. There was a problem that the assembly workability could not be improved as it had to be peeled off and pasted again.

  An object of the present invention is made in view of the above-described circumstances, and provides a flexible wiring board capable of maintaining a bent state of a bent wiring portion with a simple structure, and a portable wireless device using the same. There is to do.

  The present invention includes a routing wiring portion, a folded wiring portion that extends from the routing wiring portion and is foldable, and a hook engagement that extends from the routing wiring portion and is foldable. And a cutout portion for engaging the hook engaging portion when the bent wiring portion is bent is provided on the periphery of the bent wiring portion to constitute a flexible wiring board.

  Further, the hook engaging portion includes a tongue piece portion extending from the routing wiring portion and a hook portion extending to both sides from an end portion of the tongue piece portion.

  Further, the cutout portion formed in the bent wiring portion is characterized in that the width of the opening is made smaller than the width of the tongue piece portion of the hook engaging portion.

  Furthermore, a step portion is provided on the inner surface in the vicinity of the opening of the cutout portion formed in the bent wiring portion.

  In addition, the notch portion formed at the periphery of the bent wiring portion is configured such that when the bent wiring portion is bent and the hook engaging portion is engaged, the leading end of the hook engaging portion is routed from its root portion. It is characterized by being located on the side.

  In addition, the present invention is that a portable electronic device is configured by electrically connecting circuit boards provided in a casing or circuit boards provided in the casing and electrical components or electronic components using the flexible wiring board described above. Features.

  According to the present invention, the bent wiring portion can be maintained without being fixed in a folded state by simply engaging the engaging portion with the notch portion of the bent wiring portion. Therefore, if the flexible wiring board of the present invention is used in a portable electronic device, handling of the flexible wiring board at the time of assembly or maintenance becomes easy, and assembly and maintenance workability can be greatly improved.

  1 to 8 show an embodiment according to the present invention. The embodiment described here is applied to a flexible wiring board of the present invention and a mobile phone using the flexible wiring board. It is.

  As shown in FIG. 1, a mobile phone (mobile electronic device) 1 according to this embodiment includes a first housing 2 and a second housing that can be overlapped in the thickness direction of the first housing 2. A body 3 and a hinge portion 5 that foldably connects the two casings 2 and 3 to each other are provided. In addition, the hinge part 5 is distribute | arranged so that each edge part 2a, 3a (henceforth base end part 2a, 3a) of the two housing | casing 2 and 3 may be connected.

  Inside the second housing 3, a display unit 7 such as an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence) display, an inorganic EL display and the like having a display surface 7 a for displaying various types of information on the surface, and a phone call A speaker unit 9 is provided. The display surface 7a of the display unit 7 is exposed to the facing surface 3c side of the second housing 3 facing the first housing 2 in a state where the two housings 2 and 3 are overlapped with each other. ing. The speaker unit 9 is disposed at the distal end portion 3b of the second housing 3 located on the opposite side to the base end portion 3a, and the sound emission port of the speaker unit 9 is the facing surface of the second housing 3 It is exposed to the outside through an opening 3d penetrating from 3c to the internal space of the second casing 3.

  Inside the first housing 2 are two key operation units 11 and 13 having a plurality of operation keys 10 and 12 that can be pressed variously such as a call key and an end key, and a microphone unit 15 for a call. Is provided. Each operation key (main operation key) 10 of the first key operation unit (main key operation unit) 11 faces the second case 3 in a state where the two cases 2 and 3 are overlapped with each other. 1 is exposed outwardly from the facing surface 2c of the casing 2. Each operation key (auxiliary operation key) 12 of the second key operation unit 13 is exposed outward from the side surface 2e of the first housing 2 adjacent to the facing surface 2c. The side surface 2e of the first housing 2 is formed along the thickness direction of the first housing 2.

  The microphone unit 15 is disposed at the distal end portion 2b of the first housing 2 located on the opposite side to the base end portion 2a, and the sound collection port of the microphone unit 15 is the facing surface of the first housing 2 It is exposed to the outside through an opening 2d penetrating from 2c to the internal space of the first housing 2.

  The first housing 2 includes a front case 17 constituting the facing surface 2 c side of the first housing 2 and a rear case 19 constituting the outer surface 2 f side of the first housing 2. The front case 17 and the rear case 19 can be coupled to each other in the thickness direction of the first housing 2.

  As shown in FIG. 2, the circuit board 21, the shield case (reinforcing member) 23, and the circuit board 21 are disposed inside the first housing 2 from the inner surface 19 a side of the rear case 19 located on the opposite side of the outer surface 2 f. A key sheet having a switch board 25 constituting the first key operation unit 11 and a plurality of main operation keys 10 is arranged in an overlapping manner. In addition, an antenna 27 for wireless communication is accommodated on the distal end portion 2b side in the first housing 2. That is, the antenna 27 is disposed in the vicinity of the circuit board 21, the shield case (reinforcing member) 23, and the switch board 25. A camera unit 61 is disposed between the rear case 19 and the circuit board 21, and a window of the camera unit 61 is exposed outward from the outer surface 2 f of the rear case 19.

  A plurality of electronic components are mounted on one surface 21 a of the circuit board 21 facing the shield case 23. The electronic components include a high frequency block 31, a power supply IC 33, a memory 35, a CPU 37, and the like.

  Here, the high frequency block 31 is electrically connected to the antenna 27 via the circuit board 21 and, as shown in FIG. 3, between the antenna 27 and another telephone set via the communication network (not shown). It makes a phone call and transmits / receives various information such as e-mails and Internet home pages to / from other mobile phones and servers (not shown). Further, the power supply IC 33 controls charging and discharging of the battery 39 provided in the mobile phone 1. Further, the memory 35 stores various information such as characters, symbols, images, and various functions of the mobile phone 1.

  The CPU 37 controls operations of the speaker unit 9, the microphone unit 15, the high frequency block 31, the power supply IC 33, the memory 35, the camera unit 61, and the like. That is, the CPU 37 plays a role of, for example, outputting voice information input from the microphone unit 15 to the high frequency block 31 or outputting voice information input from the high frequency block 31 to the speaker unit 9 when making a call. For example, the CPU 37 stores various information received by the high frequency block 31 in the memory 35 and plays a role of displaying various information on the display unit 7 based on the operation of the key operation units 11 and 13. Further, for example, the CPU 37 plays a role of taking an image with the camera unit 61 based on the operation of the key operation units 11 and 13 and storing the taken image in the memory 35.

  As shown in FIG. 2, a reference potential layer 41 as a ground pattern surrounding the plurality of electronic components described above is disposed on one surface 21 a of the circuit board 21.

  The reference potential layer 41 is formed so as to partition a mounting area for a plurality of electronic components for each predetermined number of electronic components. That is, the first mounting area S1 in which the high frequency block 31 is mounted, the second mounting area S2 in which the power supply IC 33 is mounted, the third mounting area S3 in which the memory 35 and the CPU 37 are mounted, and other capacitors and resistors. A plurality of fourth mounting regions S4 on which the electronic components 32 are mounted are individually partitioned by the reference potential layer 41. The plurality of mounting areas S <b> 1 to S <b> 4 divided in this way are each positioned on the periphery of one surface 21 a of the circuit board 21.

  As shown in FIG. 4, the shield case 23 has a substantially plate-like top plate portion facing the one surface 21 a of the circuit board 21 and covering most of the surface 21 a of the circuit board 21 as shown in FIG. 4. 43 and partition wall portions 45 and 47 erected on the back surface 43b of the top plate portion 43, and is screwed onto one surface 21a of the circuit board 21 so as to cover the plurality of electronic components described above. It is fixed.

  That is, the partition wall portion 45 protrudes from the entire periphery of the back surface 43 b of the top plate portion 43 and is configured to contact the reference potential layer 41 formed on the periphery of the one surface 21 a of the circuit board 21. . Further, the partition wall portion 47 is configured to contact a reference potential layer 41 formed between the mounting regions S1 to S4 of the circuit board 21.

  Therefore, in a state where the shield case 23 is fixed to the one surface 21 a of the circuit board 21, the shield case 23 covers substantially the entire surface 21 a of the circuit board 21. Can be improved.

  Further, since the shield case 23 is brought into contact with the reference potential layer 41 and a plurality of electronic components can be divided and arranged in spaces corresponding to the mounting areas S1 to S4, the shielding case 23 is arranged in the mounting areas S1 to S4. Each corresponding space can be electromagnetically shielded.

  Further, the shield case 23 includes a substantially rectangular plate-like extension portion 49 formed integrally with a part of the partition wall portion 45. The extending portion 49 extends from the top plate portion 43 in the thickness direction of the circuit board 21 and is adjacent to the side portion of the circuit board 21 in a state where the circuit board 21 and the shield case 23 are arranged to overlap each other. And the front-end | tip is further extended in the thickness direction from the back surface 21b of the circuit board 21 located in the opposite side to the one surface 21a. Therefore, at the position where the extended portion 49 is formed, the boundary between the one surface 21a of the circuit board 21 and the side wall portion 45 is obscured.

  Further, the surface 49 a of the extending portion 49 is substantially orthogonal to the surface 43 a of the top plate portion 43, and the first casing is in a state where the shield case 23 is disposed inside the first casing 2. It opposes the opening part 2g opened to 2 side 2e side.

  The shield case 23 configured as described above can be formed of metal. For example, the top plate portion 43 is formed of a metal plate, and the partition wall portions 45 and 47 and the extension portion 49 are formed of resin. After forming and joining both together via an adhesive etc., you may use what made the partition wall parts 45 and 47 and the extension part 49 coat | cover with a conductive film, and gave electroconductivity. For example, the shield case 23 is formed by integrally forming the top plate portion 43, the partition wall portions 45 and 47, and the extending portion 49 with resin, and covering the surface with a conductive film to provide conductivity. You may use the thing. In this way, when part or all of the shield case 23 is formed of resin, the mobile phone 1 can be effectively reduced in weight.

  The switch substrate 25 is formed in a thin film shape in which a predetermined pattern of wiring made of copper foil is sandwiched between base films made of polyimide resin, for example, and has flexibility, and the top plate portion 43 and the extension The portion 49 is arranged over the respective surfaces 43a, 49a. That is, the switch board 25 includes two switch sheets 51 and 53 that are integrally formed, and the first switch sheet 51 is arranged on the surface 43 a of the shield plate 43. Further, the second switch sheet 53 is arranged on the surface 49 a of the extending portion 49 and is bent so as to be arranged substantially orthogonal to the first switch sheet 51.

  A plurality of switches 55 and 57 for the key operation units 11 and 13 are formed on the surfaces 51a and 53a of the two switch sheets 51 and 53, respectively. The switches 55 and 57 are formed in the same number as the operation keys 10 and 12 of the key operation units 11 and 13 and are electrically connected to the circuit board 21 through the flexible wiring board (not shown). Yes.

  The first key operation unit 11 includes a key sheet having the plurality of operation keys 10 described above and a plurality of switches 55 formed on the first switch sheet 51. In the first key operation unit 11, when the main operation key 10 is pressed toward the surface 43 a of the top plate part 43, the switch sheet 51 is supported by the top plate part 43. 10 depresses the switch 55.

  The second key operation unit 13 includes a key sheet having the plurality of auxiliary operation keys 12 described above and a plurality of switches 57 formed on the second switch sheet 53. The auxiliary operation key 12 of the second key operation unit 13 is fixed to the surface 49 a of the extension part 49 with the second switch sheet 53 interposed therebetween. In the second key operation unit 13, when the auxiliary operation key 12 is pressed toward the surface 49 a of the extension part 49, the switch sheet 53 is supported by the extension part 49, and thus the operation key 12. Comes into contact with the switch 57.

  Furthermore, since the top plate portion 43 and the extension portion 49 serve as a support plate that supports the first key operation portion 11 and the second key operation portion 13, the top plate portion 43 and the extension portion 49. Thus, it is possible to sufficiently secure the strength against the pressing operation of the operation keys 10 and 12 of the two key operation units 11 and 13. Further, the mobile phone 1 can be thinned by supporting the switch substrate 25 having the switch 55 by the top plate portion 43.

  In addition, although the two switch sheets 51 and 53 are composed of one flexible sheet, they may be composed of separate flexible sheets. Further, when the two switch sheets 51 and 53 are configured by individual substrates, it is not necessary to be configured by a flexible sheet having flexibility, for example, by a substrate having no flexibility. It is good.

  As shown in FIG. 4, the camera unit 61 is electrically connected to the circuit board 21 via the flexible wiring board 65 of the present invention.

  That is, as shown in FIG. 5, the flexible wiring board 65 that electrically connects the camera unit 61 and the circuit board 21 sandwiches a predetermined pattern of wiring made of copper foil between base films made of polyimide resin, for example. A flexible wiring having a lead-out wiring portion 66 made of a thin sheet and having a substantially inverted L shape in plan view, and a bent wiring portion 67 extending from the lead-out wiring portion 66 and formed so as to be foldable. An IC chip 68 and an electronic component 69 are mounted on both ends of the routing wiring portion 66 on one surface side of the substrate 65, and a connector 70 is mounted on the bent wiring portion 67.

  Further, the bent wiring portion 67 has a notch 67a at the periphery opposite to the bent side, and the hooked wiring portion 66 on the side opposite to the bent wiring portion 67 is engaged with the notch 67a. The engaging portion 71 is extended and configured to be bendable. That is, by bending the bent wiring portion 67 in the direction indicated by the arrow in FIG. 5, the bent wiring portion 67 can be routed and overlapped with the wiring portion 66 as shown in FIG. 6. As shown in FIGS. 7 and 8, the hook engaging portion 71 is bent and engaged with the notch 67a to maintain the bent state.

  The hook engaging portion 71 includes a tongue piece portion 72 extending from the routing wiring portion 66 and a hook portion 73 extending to both sides from the end portion of the tongue piece portion 72. On the other hand, the notch 67a formed in the bent wiring part 67 is formed so that the width t of the opening is smaller than the width s of the tongue piece 72 of the hook engaging part 71, and the notch A stepped portion 67b is formed on the inner surface near the opening of 67a.

  Therefore, when the tongue piece 72 of the hook engaging portion 71 is inserted into the notched portion 67a of the bent wiring portion 67, both sides of the tongue piece 72 are caught by the stepped portion 67b of the notched portion 67a, and the notched portion 67a. It becomes difficult to come off. In addition, the hooking portion 73 protruding from both sides of the end portion of the tongue piece portion 72 locks the restoring action of the bent wiring portion 67 to return to the original flat state. As a result, the bent wiring portion 67 can be maintained without being fixed in a bent state.

  At this time, as shown in FIG. 8, it is preferable that the front end of the hook engaging portion 71 is configured to be positioned closer to the lead wiring portion 66 than the root portion. In this way, when the hook engaging portion 71 is bent so as to maintain the state of being pulled down to the wiring portion 66 side, the hook engaging portion 71 is arranged at a right angle with respect to the wiring portion 66 side. In comparison, the distance from the bending point is shortened, and the engaging force at the hooking portion 73 due to the restoring force of the bent wiring portion 66 trying to return to the original state is increased. In addition, when another component or the like is disposed on the distal end side of the folded hook engaging portion 71, the height can be reduced, and contact with the other component or the like can be prevented.

  Then, the camera unit 61 is soldered to the connection terminal portion exposed on the surface of the routing wiring portion 66 opposite to the surface on which the IC chip 68 is mounted, and the bent wiring portion 67 is folded and overlapped with the routing wiring portion 66. In the combined state, the camera 70 and the circuit board 21 can be electrically connected by connecting the connector 70 included in the bent wiring part 67 to the connector receiving part 38 formed on the circuit board 21.

  Then, the portion where the camera unit 61 is mounted is folded in the opposite direction to the bent wiring portion 67 and accommodated in the rear case 19. At this time, the position of the camera unit 61 is not good due to the problem of dimensional accuracy with the rear case 19. The flexible wiring board 65 has flexibility and the bent wiring portion 67 is merely locked by engagement even when it is desired to move the wiring slightly, so that the bent wiring portion 67 and the routing wiring portion 66 Since the position of the can be easily shifted, the flexible wiring board can be easily handled during assembly and maintenance, so that it can be easily assembled without applying a load, greatly improving assembly and maintenance workability. be able to.

  In this embodiment, the flexible wiring board 65 used for connection between the camera unit 61 and the circuit board 21 has been described as an example. However, the flexible wiring board according to the present invention is connected to the switch board and the circuit board or the second housing. You may use for the connection of a display part with which the body 3 is equipped, a speaker part, and a circuit board. Moreover, although the example which provided the connector in the bending wiring part was shown, you may make it mount an electronic component here. In this case, the number of electronic components mounted on the circuit board can be reduced, and the degree of freedom in circuit design can be increased.

  Furthermore, in the above-described embodiment, the mobile phone 1 including the two casings 2 and 3 connected to each other by the hinge portion 5 has been described. However, the present invention is not limited to this, and for example, the mobile phone 1 includes a single casing. It may be a mobile phone.

  Further, the present invention is not limited to a mobile phone, and can be applied to a mobile electronic device using a flexible wiring board such as a PDA or a digital camera.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is a schematic perspective view which shows the state which opened the 1st and 2nd housing | casing of the mobile telephone which concerns on one Embodiment of this invention mutually. It is a disassembled perspective view which shows the 1st housing | casing in the mobile telephone of FIG. It is a block diagram which shows the electrical structure of the mobile telephone of FIG. FIG. 2 is an enlarged cross-sectional view illustrating configurations of a circuit board, a shield case, a key operation unit, and a camera unit in the mobile phone of FIG. 1. In the mobile phone of the present invention, it is an exploded perspective view of a flexible wiring board that connects a camera unit and a circuit board. In the mobile phone of the present invention, it is a perspective view showing a state in which a bent wiring portion of a flexible wiring board connecting a camera portion and a circuit board is bent. It is a top view which shows the engagement state of the hook engaging part and bending wiring part in the flexible wiring board of this invention. It is sectional drawing which shows the engagement state of the hook engaging part and bending wiring part in the flexible wiring board of this invention.

Explanation of symbols

1 Mobile phone (mobile radio)
2 1st housing | casing 2c Opposite surface (surface)
2e Side 10 operation keys (main operation keys)
11 First key operation unit (main key operation unit)
12 Operation keys (auxiliary operation keys)
13 Second key operation unit (auxiliary key operation unit)
21 Circuit board 21a One surface 23 Shield case 27 Antenna 31 High frequency block (electronic component)
32 Other electronic components 33 Power supply IC (electronic components)
35 Memory (electronic parts)
37 CPU (electronic parts)
41 reference potential layer 43 top plate part 43a surface 45 partition wall part 47 partition wall part 49 extension part 49a surface S1 to S4 mounting area 61 camera part 65 flexible wiring board 66 lead wiring part 67 bent wiring part 67a notch part 67b step Part 68 IC chip 69 electronic component 70 connector 71 hook engaging part 72 tongue piece part 73 hook part

Claims (6)

  A routing wiring portion; a folding wiring portion extending from the routing wiring portion and provided so as to be bent; and a hook engaging portion extending from the routing wiring portion and provided so as to be bent. And a flexible wiring board having a notch for engaging the hook engaging portion when the bent wiring portion is bent at the periphery of the bent wiring portion.   The flexible wiring board according to claim 1, wherein the hook engaging portion includes a tongue piece portion extending from the routing wiring portion, and a hook portion extending to both sides from an end portion of the tongue piece portion.   The flexible printed circuit board according to claim 2, wherein a width of an opening of the cutout portion formed in the bent wiring portion is smaller than a width of a tongue piece portion of the hook engaging portion.   The flexible wiring board according to claim 3, further comprising a step portion on an inner surface in the vicinity of the opening of the cutout portion formed in the bent wiring portion.   The notch formed on the periphery of the bent wiring portion is located on the wiring portion side with the tip of the hook engaging portion being routed from the root portion when the bent wiring portion is bent and the hook engaging portion is engaged. The flexible wiring board according to any one of claims 1 to 4, wherein the flexible wiring board is provided as described above.   The circuit boards provided in the casing or the circuit boards provided in the casing and the electrical component or the electronic component are electrically connected to each other using the flexible wiring board according to any one of claims 1 to 5. A portable electronic device characterized by that.

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