JP2016164920A - Electronic apparatus and flexible wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble an electronic apparatus in accordance with whether a circuit module is mounted, without requiring a plurality of kinds of flexible wiring boards.SOLUTION: In a relay flexible wiring board 112 including a connector terminal part 112a that is connectable to a wireless LAN module 111, a hole 112d is formed in the vicinity of the connector terminal part 112a, a signal line 201 to the connector terminal part 112a is wired while detouring the hole part 112d, and a coverlay opening 112f exposing the signal line 201 is provided around the hole part 112d. In a non-mounted model of a digital camera 100 in which the wireless LAN module 111 is not mounted, in the state where a washer 117 is brought into contact with the signal line 201 exposed in the coverlay opening 112f, the hole part 112d is screwed to a sub chassis 107, such that the signal line 201 is conducted with the sub chassis 107 via the washer 117 and the screw.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electronic device and a flexible wiring board, and more particularly to a termination structure for a flexible wiring board assembled in an electronic device.

  Some electronic devices such as digital cameras, video cameras, and mobile phones are equipped with circuit modules such as a wireless LAN module and a GPS (Global Position System) module. In such an electronic device, a wireless LAN module can be used to transfer the captured image data to a cloud computer or the like, and other devices can be operated, and the positioning result of the GPS module can be used as a shooting location. It can be added to the image data and recorded. On the other hand, some electronic devices have been introduced to the market with both wireless function and GPS function mounting models and non-mounting models in consideration of users who do not need the wireless function or the GPS function.

  FIG. 8 is a perspective view showing an example of the internal configuration of a conventional digital camera as an example. FIG. 8A shows the internal configuration of a mounting model equipped with a wireless LAN module, and FIG. 8B shows the internal configuration of a non-mounting model not equipped with a wireless LAN module.

  As shown in FIG. 8A, in the mounted model, a wireless LAN module 401 is disposed at a substantially upper center of the camera body. The wireless LAN module 401 includes an antenna 401a, a communication control IC 401b, a connector 401c, and a printed board 401d on which these are mounted. In addition, a main wiring board 402 on which an engine for controlling the digital camera is mounted and a flexible wiring board 403 that connects the wireless LAN module 401 and the main wiring board 402 so as to communicate with each other are disposed in the camera body. The flexible wiring board 403 includes a connector terminal portion 403 a inserted into the connector 401 c of the wireless LAN module 401 and a connector terminal portion 403 b inserted into the connector 402 a mounted on the main wiring board 402.

  On the other hand, as shown in FIG. 8B, since the wireless LAN module 401 is not arranged in the non-mounted model, transmission / reception of signals between the wireless LAN module 401 and the main wiring board 402 becomes unnecessary. Here, if the flexible wiring board 403 is used as it is in a non-mounted model, the connector terminal portion 403a and the surrounding wiring for wireless control remain, and the connector terminal portion 403a comes into contact with other metal parts. May cause a short circuit. In addition, since the wiring for wireless control is connected to the engine, the wiring is controlled to have the same potential as the ground. However, due to the characteristics of the internal transistors and the like, the potential is not completely 0V. Will flutter. Furthermore, radiation noise may occur due to noise jumping from the surroundings to the wiring.

  Therefore, a technique for solving these problems by simply connecting unnecessary wiring to the ground by screwing is known (see Patent Documents 1 and 2). On the other hand, as shown in FIG. 8B, the non-mounted model is provided with the connector terminal portion 403a and the flexible wiring board 403A from which unnecessary wiring such as an antenna pattern causing radiation noise is deleted. There is also a technique.

JP 2008-27551 A Japanese Patent Laid-Open No. 7-236079

  However, when the flexible wiring boards 403 and 403A are manufactured for each of the mounted model and the non-mounted model, two substrate molds are required, resulting in an increase in cost. In addition, since the wiring such as the ground line changes between the flexible wiring board 403 for the mounted model and the flexible wiring board 403A for the non-mounted model, it is necessary to take countermeasures and examine each of the radiation noise. Furthermore, if flexible wiring boards 403 and 403A having similar shapes exist, there is a risk of erroneous assembly during assembly. On the other hand, with the methods described in Patent Documents 1 and 2, it is not easy to deal with a large number of signal lines, and there is a risk that downsizing of electronic devices may be hindered.

  The present invention enables assembly according to whether or not a circuit module is mounted without requiring a plurality of types of flexible wiring boards, and suppresses the generation of radiation noise in a non-mounted model that does not include a circuit module. It is an object to provide an electronic device that can be used.

  An electronic device according to the present invention is an electronic device in which a circuit module can be mounted, and includes a wiring board on which electronic components are mounted, a flexible wiring board that electrically connects the circuit module and the wiring board, A circuit module or a chassis for fixing the flexible wiring board, the flexible wiring board having a connector terminal portion connectable to a connector of the circuit module, a hole formed in the vicinity of the connector terminal portion, A signal wiring routed to the connector terminal portion bypassing the hole portion and a wiring exposed portion exposing a predetermined wiring of the signal wiring around the hole portion, and mounted on the circuit module The flexible wiring board has a connector terminal portion connected to a connector of the circuit module. When the circuit module is not mounted on the electronic device, the flexible wiring board is fixed to the chassis by a metal part in the hole, and the predetermined wiring exposed in the wiring exposed part is It is connected to the ground by conducting with the chassis through a metal part.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly according to the presence or absence of the mounting of a circuit module is possible without requiring multiple types of flexible wiring boards, and an electronic device in which the generation of radiation noise is suppressed can be realized. it can.

1 is an exploded perspective view of a front side and an exploded perspective view of a back side of a digital camera according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a partial configuration of a mounting model in which the wireless LAN module is mounted in the digital camera of FIG. 1. FIG. 2 is a perspective view showing a partial configuration of the non-mounted model in which the wireless camera is not mounted, which is the digital camera of FIG. 1. It is a top view which shows the wiring pattern in the arm part of the relay flexible wiring board used for the digital camera of FIG. FIG. 4 is a wiring block diagram in the mounted model of FIG. 2 and a wiring block diagram in the non-mounted model of FIG. 3. It is a digital camera which concerns on 2nd Embodiment of this invention, Comprising: It is a perspective view which shows the partial structure of the mounting model carrying a wireless LAN module. It is a perspective view which shows the partial structure of the non-mounting model which is a digital camera which concerns on 2nd Embodiment of this invention, and does not mount a wireless LAN module. It is a perspective view which shows an example of the internal structure of the conventional digital camera.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, a so-called digital camera is taken as an example of the electronic apparatus according to the present invention, but the electronic apparatus according to the present invention is not limited to the digital camera.

<First Embodiment>
1A is an exploded perspective view of the digital camera 100 according to the first embodiment of the present invention as viewed from the front side, and FIG. 1B is an exploded perspective view of the digital camera 100 as viewed from the back side. The illustration of the exterior member is omitted in each figure.

  The digital camera 100 includes a lens barrel 101, a strobe unit 102, an upper cover 103, a release button 104, a power button 105, an operation flexible wiring board 106, a sub chassis 107, a main wiring board 108, an engine 109, and a main chassis 110. The digital camera 100 also includes a wireless LAN module 111, a relay flexible wiring board 112, a USB connector 113, an AF auxiliary light emitting unit 114, an LCD panel 115, and a battery box 116.

  The lens barrel 101 holds a plurality of lenses such as a zoom lens and a focus lens. The strobe unit 102 pops up as necessary and irradiates the subject with a flash. The upper cover 103 holds a release button 104 and a power button 105. On the operation flexible wiring board 106, a release switch and a power switch that are turned on / off by a release button 104 and a power button 105 are mounted. The operation flexible wiring board 106 is attached to the sub chassis 107. An engine 109 that is an electronic component that performs operation control of the digital camera 100, image processing for developing image data of a captured image, and the like is mounted on the main wiring board 108. The main wiring board 108 is screwed to the main chassis 110.

  The wireless LAN module 111 is fixed to the main chassis 110 and the sub chassis 107 with screws. A USB flexible connector 113 and an AF auxiliary light emitting unit 114 are mounted on the relay flexible wiring board 112. The wireless LAN module 111 is connected to the engine 109 via the relay flexible wiring board 112. The main chassis 110 holds the lens barrel 101, the strobe unit 102, the LCD panel 115, and the battery box 116.

  The digital camera 100 has a configuration in which the wireless LAN module 111 can be mounted and a configuration in which the wireless LAN module 111 can be omitted. In other words, a model equipped with the wireless LAN module 111 is a model to be described below with reference to FIG. 2 and the like, and a model without the wireless LAN module 111 is explained below with reference to FIG. It becomes an on-board model. The screw holes 107a, 107b, 110a, 110b, the contact portion 107c, and the screw stopper portion 107d shown in FIG. 1 will be described together with the description given below with reference to FIG.

  FIG. 2 is a perspective view showing a partial configuration of a mounting model on which the wireless LAN module 111 is mounted. FIG. 3 is a perspective view showing a partial configuration of a non-mounted model in which the wireless LAN module 111 is not mounted. With reference to FIG. 2 and FIG. 3, and with reference to FIG. 1 as appropriate, each configuration of a mounting model and a non-mounting model using one type of relay flexible wiring board 112 will be described.

  As shown in FIG. 2, the wireless LAN module 111 includes a communication control IC 111a, a chip antenna 111b, a connector 111c, and a wireless LAN board 111d. A communication control IC 111a that performs wireless LAN communication control is mounted on the wireless LAN board 111d. The connector 111c receives a signal from the engine 109 via the relay flexible wiring board 112.

  In the mounted model, the wireless LAN module 111 is fastened to the main chassis 110 via the subchassis 107 at two locations with screws 111e and 111f. The sub chassis 107 is provided with screw holes 107b and 107a (see FIG. 1) at two locations corresponding to the screw fixing positions of the wireless LAN module 111. Similarly, screw holes 110b and 110a (see FIG. 1) are also provided in the main chassis 110.

  The sub chassis 107 is provided with a contact portion 107c that makes surface contact with the wireless LAN board 111d (see FIG. 1), and heat generated during wireless LAN communication can be released to the sub chassis 107 via the contact portion 107c. It is like that. The subchassis 107 is notched directly below the chip antenna 111b, and has a structure that does not affect the antenna characteristics.

  The relay flexible wiring board 112 includes a connector terminal part 112 a that can be connected to the connector 111 c of the wireless LAN module 111 and a connector terminal part 112 b that is inserted and connected to the connector 108 a mounted on the main wiring board 108. In the mounted model, the relay flexible wiring board 112 is assembled by connecting the connector terminal portion 112 a to the connector 111 c of the wireless LAN module 111 and connecting the connector terminal portion 112 b to the connector 108 a mounted on the main wiring board 108. In FIG. 2, the connector terminal portions 112a and 112b are hidden in the connectors 111c and 108a, respectively, so that the positions are indicated by broken lines.

  The connector terminal portion 112 a is provided at the tip of the arm portion 112 c of the relay flexible wiring board 112. A hole 112d is formed in the vicinity of the connector terminal 112a in the arm 112c. By providing the hole portion 112d, when inserting the connector terminal portion 112a into the connector 111c, a jig such as tweezers can be attached (inserted) into the hole portion 112d and pulled into the connector 111c side for assembly. Workability at the time can be improved. Note that the hole 112d may be reinforced with a reinforcing plate or the like so that the arm 112c is not disconnected when the tweezers are attached.

  Next, the configuration of the non-mounted model will be described. As shown in FIG. 1, the subchassis 107 is provided with a screw stopper 107d. The screw stopper 107d is provided at a position corresponding to the hole 112d of the relay flexible wiring board 112. In the non-mounted model, there is no connector for connecting the connector terminal portion 112a. Therefore, as shown in FIG. 3, the relay flexible wiring board 112 is assembled by being screwed with screws 112k at the hole 112d and the screwing portion 107d provided in the arm portion 112c. At that time, a washer 117 is interposed between the screw head of the screw 112k and the arm portion 112c.

  In FIG. 3, since the hole 112d is hidden by the screw 112k and the washer 117, the approximate position of the hole 112d is indicated by a broken line. Further, since the screw holes 107b and 107a provided in the sub chassis 107 are closed by screws 111e and 111f attached to the sub chassis 107, the approximate positions of the screw holes 107b are indicated by broken lines, The screw hole 107a is not shown.

  The sub-chassis 107 is provided with a bent portion 107e raised from the surface on which the screw fixing portion 107d is provided. The arm portion 112c of the relay flexible wiring board 112 is brought into contact with the bent portion 107e, thereby restricting the arm portion 112c from rotating during the screwing operation with the screw 112k. In addition, if a reinforcement board is affixed on the arm part 112c, the bigger rotation control effect will be acquired.

  Thus, in the mounting model, the connector terminal portion 112a of the relay flexible wiring board 112 is connected to the connector 111c, and in the non-mounting model, the connector terminal portion 112a is fixed by screwing the hole 112d of the relay flexible wiring board 112. It is fixed.

  FIG. 4 is a plan view showing a wiring pattern in the arm portion 112 c of the relay flexible wiring board 112. The arm portion 112c is provided with a signal line 201, a ground line 202, and a power line 203, which are signal wirings necessary for execution of wireless LAN communication. The signal line 201 is a data line, a clock line, or the like that transmits / receives a control signal to / from the engine 109, and is a wiring that can be thinned because a current that flows is small. The ground line 202 is a return line of the power supply, and is desirably a thick line in order to be strong against noise. The power supply line 203 is a wiring that supplies power for driving the wireless LAN module 111.

  The connector terminal portion 112a is usually a wiring exposed portion where a cover lay covering the relay flexible wiring board 112 is peeled off and a wiring conductor is exposed. The exposed conductor surface is gold-plated so that good electrical continuity can be obtained when inserted into the connector 111c. In addition, the reinforcing plate 112i is affixed on the back surface of the connector terminal portion 112a, and the reinforcing plate 112i contributes to improvement in workability when the connector terminal portion 112a is inserted into the connector 111c.

  A coverlay opening 112f is provided around the hole 112d. The cover lay opening 112f is also a wiring exposed part where the wiring conductor is exposed, but is wired outside the cover lay opening 112f so that only the power line 203 is not exposed. The cover lay opening 112f is plated with gold, but by using soft nickel plating as the nickel plating used for the base, the structure is such that disconnection is less likely to occur when bent during assembly operations.

  The signal line 201 and the ground line 202 are wired so as to bypass the hole 112d. The signal line 201 is once thick at the edge 112g of the cover lay opening 112f, and thin at the bypass 112h that bypasses the hole 112d. Therefore, even if the hole 112d is provided, the wiring can be performed without increasing the width of the arm 112c.

  When the arm portion 112c is screwed with the screw 112k in the hole portion 112d, the washer 117 comes into contact with the signal line 201 and the ground line 202 in the washer contact region 117a. As a result, all exposed signal lines are conducted through the washer 117. Further, the washer 117 is screwed to the sub chassis 107 with a screw 112k. Therefore, the signal line 201 and the ground line 202 are connected to the ground by being connected to the sub chassis 107 via the washer 117 and the screw 112k which are metal parts.

  If the washer 117 is rotated at the time of screwing with the screw 112k, the end of the washer 117 and the wiring are substantially perpendicular to each other at the edge portion 112g, so that the wiring is easily disconnected. In order to prevent this disconnection, the wiring of the signal line 201 is thickened at the edge portion 112g. On the other hand, since the detour portion 112h is wired substantially parallel to the rotation direction of the screw 112k, it is difficult to disconnect even if the wire is thin. For this reason, the wire is thinned so that the arm portion 112c does not become thick. Since the ground line 202 is a thick wiring from the beginning, the wiring width is not changed in the present embodiment. However, when the ground line 202 is thin, the wiring width may be increased at the edge portion 112g.

  FIG. 5A is a wiring block diagram in a mounting model in which the wireless LAN module 111 is mounted, and is a wiring block diagram in a non-mounting model in which the wireless LAN module 111 is not mounted.

  In the mounted model, as shown in FIG. 5A, a signal is sent from the engine 109 to the wireless LAN module 111 through one of the signal lines 201. The signal port 109a has SW1 and SW2 made of transistors. When the signal port 109a issues a signal for closing SW1, the power source and the signal line 201 are conducted, and a predetermined voltage is applied to the signal line 201. At this time, the signal line 201 is in a high (Hi) state. On the other hand, when the signal port 109a outputs a signal for closing SW2, the ground and the signal line 201 are brought into conduction, the ground voltage becomes 0V, and the signal pattern becomes a low (Lo) state. As described above, when the signal port 109 a performs switching, a command (signal) is transmitted to the wireless LAN module 111.

  In a non-mounted model, if the relay flexible wiring board 112 is screwed in the hole 112d in a state where a voltage is applied to the signal line 201, a problem occurs due to a short circuit between the wirings. In order to avoid the occurrence of this problem, in the non-mounted model, as shown in FIG. 5B, control is performed to close SW2 so that the signal line 201 is always grounded from the signal port 109a. As a result, the relay flexible wiring board 112 can be screwed at the hole 112d without short-circuiting the wiring. Further, since the engine 109 which is both ends of the signal line 201 and the vicinity of the hole 112d of the relay flexible wiring board 112 can be connected to the ground, the signal line 201 can be prevented from generating noise as an antenna. . Furthermore, since the signal line 201 can be electrically connected to the ground line 202, the ground connection can be enhanced.

  In this way, in the non-mounted model, the signal line 201 and the ground line 202 are exposed around the hole 112d provided in the relay flexible wiring board 112, and the signal line 201 is screwed in a ground potential state by electrical control. The Therefore, the wiring (signal line 201) that can be an antenna pattern can be easily connected to the ground. Moreover, since the arm part 112c of the relay flexible wiring board 112 is completely fixed by the screw 112k, the connector terminal part 112a does not come into contact with another sheet metal to cause a short circuit. Furthermore, it is not necessary to create different types of relay flexible wiring boards for the mounted model and the non-mounted model, and the cost can be reduced by sharing the parts.

Second Embodiment
FIG. 6 is a perspective view showing a partial configuration of a mounting model in which the wireless LAN module 301 is mounted, which is a digital camera according to the second embodiment. FIG. 7 is a perspective view showing a partial configuration of a non-mounted model that is a digital camera according to the second embodiment and does not have the wireless LAN module 301 mounted thereon.

  Here, only the differences between the mounting model in which the wireless LAN module 111 described above is mounted and the non-mounting model in which the wireless LAN module 111 is not mounted will be described. The relay flexible wiring board 112 described in the first embodiment is assembled to both the mounted model and the non-mounted model of the digital camera according to the second embodiment, and the configuration of the subchassis used at that time is the second embodiment. The form and the first embodiment are different.

  As shown in FIG. 6, in the mounted model, the wireless LAN module 301 is fastened together with the main chassis 303 and screws 305a and 305b in a state of being mounted on the sub chassis 302. The sub chassis 302 is provided with screw holes 302a and 302b for attaching screws 305a and 305b. In FIG. 6, since the screw holes 302a and 302b are hidden and cannot be seen, the approximate positions are indicated by broken lines.

  A screw 305a is attached to the screw hole 302a. At this time, since the relay flexible wiring board 112 is wound around just above the screw 305a, the screw 305a having a thin screw head is used. The connector terminal portion 112a provided at the tip of the arm portion 112c of the relay flexible wiring board 112 is inserted into the connector of the wireless LAN module 301 as in the first embodiment.

  On the other hand, as shown in FIG. 7, in the non-mounted model, the hole 112d of the relay flexible wiring board 112 and the screw hole 302a coincide with each other, and the arm part 112c is formed by the screw 112k in the hole 112d through the washer 117. Screwed. Therefore, it is not necessary to provide a new screw hole for fixing the relay flexible wiring board 112 in the subchassis 302, and the subchassis 302 can be shared by the mounting model and the non-mounting model, resulting in an increase in cost. There is nothing. Further, the arm portion 112c of the relay flexible wiring board 112 is screwed at the same position regardless of the presence or absence of the wireless LAN module 301, so that there is little change in electrical contact, and the EMI noise between the mounted model and the non-mounted model is small. The electrical characteristics against static electricity and the like can be made substantially the same. Thereby, even if an EMI countermeasure part is required, the countermeasure effect can be obtained equally, so that the examination load can be reduced.

<Other embodiments>
Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. For example, in the above-described embodiment, the mounting model and the non-mounting model of the wireless LAN module that performs wireless LAN communication have been described. However, circuit modules mounted on electronic devices are not limited to wireless LAN modules, but can be applied if they are modularized, such as GPS modules, infrared communication modules, and Bluetooth (registered trademark) modules. It is. In addition, the electronic device may include only one circuit module, or may include a plurality of circuit modules.

107 Subchassis 108 Main Wiring Board 109 Engine 110 Main Chassis 111 Wireless LAN Module 111c Connector 112 Relay Flexible Wiring Board 112a Connector Terminal Part 112d Hole 201 Signal Line 202 Ground Line 203 Power Line 301 Wireless LAN Module 302 Subchassis 303 Main Chassis

Claims (8)

An electronic device capable of mounting a circuit module,
A wiring board on which electronic components are mounted;
A flexible wiring board for electrically connecting the circuit module and the wiring board;
A chassis for fixing the circuit module or the flexible wiring board;
The flexible wiring board is
A connector terminal portion connectable with the connector of the circuit module;
A hole formed in the vicinity of the connector terminal portion;
Signal wiring routed to the connector terminal portion bypassing the hole portion;
A wiring exposed portion exposing a predetermined wiring of the signal wiring around the hole portion;
When the circuit module is mounted, the flexible wiring board is assembled to the electronic device by connecting the connector terminal portion to the connector of the circuit module,
When the circuit module is not mounted, the flexible wiring board is fixed to the chassis by a metal part in the hole, and the predetermined wiring exposed in the wiring exposed part is connected to the chassis via the metal part. An electronic device characterized in that it is connected to the ground by electrical conduction. The metal parts are washers and screws,
Screw holes are provided in the chassis,
When the circuit module is not mounted, the predetermined wiring exposed in the wiring exposed portion is fixed to the washer and the flexible wiring board by the screw in the screw hole. The electronic apparatus according to claim 1, wherein the electronic apparatus is electrically connected to the chassis via a screw.   The predetermined wiring exposed at the wiring exposed portion has a wiring width at a portion substantially orthogonal to a rotation direction of the screw when the washer and the flexible wiring board are screwed to the chassis by the screw. The electronic apparatus according to claim 2, wherein the electronic apparatus is thicker than a wiring width at a portion wired substantially parallel to the direction.   3. When the circuit module is mounted, the circuit module and the chassis are fastened together by screwing the screw holes provided in the chassis with screws. Or the electronic device of 3. The signal wiring includes a signal line through which the electronic component transmits and receives a signal for controlling the operation of the circuit module, a ground line connected to the ground of the electronic component, and a power supply line that supplies power to the circuit module Have
The predetermined wiring exposed in the wiring exposed portion is the signal line and the ground line, and the power supply line is not exposed in the wiring exposed portion. The electronic device as described in the paragraph.   The electronic device according to claim 1, wherein the circuit module is at least one of a wireless LAN module and a GPS module.   The said hole is used for mounting | wearing with the jig | tool at the time of inserting the said connector terminal part in the connector provided in the said circuit module when the said circuit module is mounted. 6. The electronic device according to any one of 6. A flexible wiring board having a connector terminal portion,
A hole formed in the vicinity of the connector terminal portion;
Signal wiring routed to the connector terminal portion around the hole portion,
A flexible wiring board, wherein a wiring exposed portion in which a predetermined wiring of the signal wiring is exposed is provided around the hole portion.