JP2009200291A - Connection structure, wiring board module, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure etc., which has high reliability of electric connections adaptively to a narrower pitch and higher-density packaging. <P>SOLUTION: An FPC 30 is inserted into an insertion slot 21a of a main body portion 21 (holding member) of a housing 20 while folded. Then a cover 22 (press member) is closed to press the FPC 30 and then a state of contact between wiring 32 (second conductor layer) of the FPC 30 and wiring 12 (first conductor layer) of a PCB 10 (motherboard) is surely maintained by the elastic force of the folded FPC 30. Further, a reinforcing plate 35 increases the elastic force to surely hold the state of contact between the wiring 12 and wiring 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wiring board connector, a wiring board module, and an electronic device that are formed by connecting wiring boards together.

  2. Description of the Related Art Conventionally, film-shaped wiring bodies, so-called flexible printed wiring boards, are often arranged particularly in small and light electrical devices such as mobile phones. Since the flexible printed wiring board is extremely convenient for electrical connection in a device having an opening / closing mechanism and a rotating mechanism such as a mobile phone, the frequency of use has increased in recent years. The flexible printed wiring board is rich in flexibility, but unlike the rigid wiring board having a rigid structure, it is difficult to increase the insertion force when the flexible printed wiring board is inserted into the insertion port of the connector. Therefore, a non-insertion force connector (ZIF) is widely used as a connection structure (connector) for connecting a flexible printed wiring board to another wiring board (see Patent Documents 1 and 2).

  FIG. 5 is a side view of connector terminals arranged on a ZIF connector having a general ZIF structure. As shown in the figure, the ZIF connector is provided with a connector terminal 110 installed on a rigid board 131 of a hard printed wiring board (hereinafter abbreviated as PCB) 130 as a mother board. A flexible printed wiring board (hereinafter abbreviated as “FPC”) 140 is inserted. When the FPC 140 is inserted and abuts against the base portion 111 of the connector terminal 110, the lock lever 116 and the cam-like abutment portion 17 provided on the upper arm portion 113 are rotated in a clockwise direction, and wiring on the FPC 140 (not shown) Z) and the electrical contact portion 115 provided on the lower arm portion 112 are kept in contact with each other, and the reinforcing plate 144 of the flexible substrate 141 is pressed using the elasticity of the upper arm portion 113. The connector terminal 110 is electrically connected to the wiring 132 of the PCB 130 by a connecting portion 119 such as solder provided at the tip of the lower arm portion 112. Thereby, the wiring on the FPC 140 and the wiring 132 on the PCB 130 are electrically connected via the connector terminal 110. Although not shown, the connector terminal 110 is inserted into the housing of the ZIF connector.

In the ZIF connector, another connector terminal having a structure different from that of the connector terminal 110 shown in FIG. 5 is arranged. Another connector terminal has a connecting portion at a portion corresponding to the base 111 of the connector terminal 110, and is connected to a wiring provided on the PCB 130 that extends from the side opposite to the wiring 132. Further, the electrical contact portion of another connector terminal is provided in front of the contact portion 117 with respect to the FPC 140, contrary to the electrical contact portion 115 of the connector terminal 110. Then, by alternately arranging the connector terminal shown in FIG. 5 and another connector terminal, the bending moment applied to the FPC 140 by the pressing force of the lock lever 116 is opposite to the connector terminal 110, and the holding force to the FPC 140 is maintained. Trying to secure.
Patent Documents 1 and 2 disclose various structures of connector terminals.

Japanese Patent Publication No. 6-65090 Japanese Patent Publication No. 7-24230

In the conventional ZIF structure described above, in order to keep the wiring on the FPC 140 and the electrical contact portion 115 provided on the lower arm portion 112 in contact with each other while inserting the FPC 140 into the connector terminal 110 with a small resistance, some elasticity is required. A member is required, and in the structure shown in FIG. 5, the elasticity of the upper arm portion 113 is mainly used.
However, recently, with the progress of miniaturization of various electric devices such as mobile phones, when the pitch between FPCs and ZIF connectors is required to be reduced, the number of wires is divided into the number corresponding to the number of wires. The dimensions of the connector terminal 110 must be reduced. For this reason, it has become difficult to maintain sufficient reliability of the electrical connection in the connector terminal 110 by providing the upper arm 113 and the like of the connector terminal 110 with sufficient elasticity.

  An object of the present invention is to provide a wiring board connection body that can cope with a narrow pitch of a conductor layer such as wiring and that can maintain connection reliability, and a wiring board module using the wiring board connecting body. It is to provide.

  The wiring board connector of the present invention is obtained by connecting a mother board on which a first conductor layer is formed and a flexible printed wiring board on which a second conductor layer is formed via a holding member, The flexible printed wiring board is bent and pressed and held.

  As a result, the bent portion of the flexible printed wiring board functions as an elastic body, so that the second conductor layer of the flexible printed wiring board and the first of the mother board can be simply pressed without using an additional elastic member. The contact state with one conductor layer is reliably maintained. And even if the wiring is made into a narrow pitch, there is no influence on the elastic force of the base film, so that the connection reliability can be maintained.

  In the present invention, in a state where the flexible printed wiring board is bent, an elastic force is reliably obtained by the presence of a gap between the tip portion of the flexible printed wiring board and the portion facing the tip portion. .

  Since the flexible printed wiring board has the reinforcing plate provided in the region on the back side of the second conductor layer forming surface, the elastic force can be supplemented by the reinforcing plate.

  The wiring board module of the present invention is obtained by mounting an electronic component on at least one of the mother board and the flexible printed wiring board of the wiring board connector, and the electronic device of the present invention includes the wiring board module. Also in these cases, it is possible to provide a wiring board module and an electronic device that are suitable for reducing the pitch between conductor layers and have high electrical connection reliability.

  According to the connection structure, wiring board connection body, wiring board module, or electronic device of the present invention, electrical reliability can be favorably maintained in response to miniaturization and thinning.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing the structure of an FPC 30 (flexible printed wiring board) according to Embodiment 1 of the present invention. As shown in the figure, the FPC 30 includes a base film 31, a wiring 32 (second conductor layer) provided in a portion excluding the tip portion Rtp on the upper surface 31 a side of the base film 31, and a tip portion of the wire 32. And a cover lay 33 that covers other parts, and a reinforcing plate 35 made of an elastic material provided on the lower surface 31b side of the base film 31. That is, it has a single-sided circuit type structure.
In addition, a pair of engaging portions 30 a that are enlarged on both sides are provided at the forefront of the base film 31 and the reinforcing plate 35 of the FPC 30.
In the present embodiment, the wiring 32 is not provided at the distal end portion Rtp of the FPC 30, but the wiring 32 may also be provided at the distal end portion Rtp.

As a material of the base film 31, a polyimide plate having a thickness of about 12.5 μm to 125 μm is used. Not only the polyimide plate but also a polyester plate (low temperature use), a glass epoxy plate (thin plate), etc. can be used, but since the elastic modulus of the polyester plate is slightly inferior, the glass epoxy plate is thicker than the polyimide plate Since they are relatively easy to break when bent, it is preferable to use one that is thinner than a polyimide plate.
As a material of the wiring 32, a copper alloy is generally used, but is not limited to this.

  As the material of the reinforcing plate 35, generally, a paper phenol plate, a glass epoxy plate, a polyimide plate, a polyester plate, a metal plate, and the like are used. In the present invention, for example, a wiring having a thickness of about 25 μm is used. In order to reinforce the elastic force when the base film 31 having a thickness of about 25 μm is bent, it is preferable to use a metal thin plate made of aluminum, copper, SUS, or the like having a thickness of 30 μm to 50 μm. In that case, the reinforcing plate 35 is bonded to the base film 31 by a thermosetting adhesive such as an epoxy sheet or a pressure sensitive adhesive such as a double-sided pressure-sensitive adhesive sheet. Among them, it is preferable to use an adhesive sheet in terms of low cost and simple process.

  Examples of the material of the coverlay 33 include a film-like coverlay made of the same material as the base film 31, a covercoat ink formed by printing a liquid epoxy resin ink, epoxy, acrylic, polyimide, polyurethane, etc. There is a photosensitive cover lay using resin, and any of them may be used.

  FIG. 2 is a perspective view schematically showing the structure of the housing 20 in the first embodiment. The casing 20 is a member for mounting the FPC 30 on the mother board. As shown in the figure, the casing 20 according to the present embodiment includes a main body 21 that is a holding member that holds the FPC 30, and a main body. And a lid 22 (pressing member) attached to the portion 21.

The lid 22 has a rotating shaft 25 (see FIGS. 3A and 3B) rotatably supported by a bearing 26 provided on the main body 21 and an engagement recess (not shown) of the main body 21. ) And an engaging portion 23 (convex portion) for holding the lid 22 in a closed state.
Further, the main body portion 21 is formed with an insertion port 21a into which the FPC 30 is inserted and a notch portion 21b into which the engaging portion 30a of the FPC 30 is locked.

  FIGS. 3A and 3B are cross-sectional views showing states before and after the FPC 30 is attached to the housing in order. As shown in FIGS. 3A and 3B, the housing 20 is installed on a hard printed wiring board (hereinafter abbreviated as PCB) 10 which is a mother board. The PCB 10 includes a rigid substrate 11 and a wiring 12 (first conductor layer) formed on the rigid substrate 11.

  The rigid substrate 11 is not limited to a glass epoxy plate, but may be a paper phenol plate, a paper epoxy plate, a fluororesin plate, an alumina plate, or the like. The material of the wiring 12 is generally a copper alloy, but is not limited to this.

First, as shown in FIG. 3A, the lid 22 of the housing 20 is in an open state by being rotated counterclockwise about the rotation shaft 25.
In this state, the front end portion Rtp of the FPC 30 is bent with the wiring 32 downward and the reinforcing plate 35 inside, and the engaging portion 30a of the FPC 30 is engaged with the notch portion 21b of the main body portion 21 of the housing 20. Then, the FPC 30 is inserted from the insertion port 21a of the main body 21.

  Then, as shown in FIG. 3B, the lid 22 is rotated clockwise about the rotation shaft 25, and the lid 22 is closed while pressing the FPC 30. Thereby, the wiring connector A formed by connecting the FPC 30 to the PCB 10 as the mother board via the main body 21 (holding member) of the housing 20 is assembled. At this time, although not shown in FIG. 3B, the engaging portion 23 (see FIG. 2) provided near the tip of the lid 22 is engaged with the engaging recess (not shown) of the main body portion 21. In addition, the closed state of the lid 22 is maintained.

  As shown in FIG. 3B, each wiring 32 (second conductor layer) of the FPC 30 has the elasticity of the base film 31 and the reinforcing plate 35 when the base film 31 and the reinforcing plate 35 are pressed by the lid 22. The force is pressed against each wiring 11 (first conductor layer) of the PCB 10 which is the mother board, and comes into strong contact with each other.

  In addition, a position where the lid 22 is closed is set so that a gap Spc exists between the front end portion Rtp of the FPC 30 and the facing portion Rop facing it.

  According to the present embodiment, since the bent portion of the FPC 30 functions as an elastic body, the FPC 30 can be simply pressed by the lid 22 that is a pressing member without using an additional elastic member. The contact state between the wiring 32 (second conductor layer) and the wiring 12 (first conductor layer) of the PCB 10 (mother substrate) is reliably maintained. Even if the wirings 32 and 12 are made to have a narrow pitch, the elastic force of the base film 31 is not affected, so that the connection reliability can be maintained.

  In particular, as in the present embodiment, in a state where the FPC 30 is bent, the FPC 30 is bent due to the presence of a gap Spc between the tip portion Rtp and the facing portion Rtp facing the tip portion Rtp. The elastic force of the part can be reliably obtained.

Moreover, since the elastic force of the base film 31 is reinforced by providing the reinforcing member 35 as in the present embodiment, the wiring 12 (first conductor layer) and the wiring 32 (second conductor layer) The contact state is reliably maintained.
However, depending on the material and thickness of the base film 31, a sufficient elastic force can be obtained without the reinforcing plate 35, so that the reinforcing plate 35 is not necessarily provided.

(Embodiment 2)
FIG. 4 is a perspective view showing various wiring board modules built in an electronic device functioning as a mobile phone and a connection relationship between the wiring board modules according to the second embodiment. The wiring board module in the present embodiment is obtained by mounting electronic components on at least one of the mother board and the flexible printed wiring board of the wiring board connector shown in the first embodiment.

The wiring board module built in the electronic device of the present embodiment includes a main display 61 that displays a screen of a mobile phone equipped with the LED 90, a first sub PCB 62 and a main PCB 63 that are responsible for main control in the electronic device, An integrated sub-display 64 for displaying secondary information of a mobile phone, a second sub-PCB 65, an in-camera control PCB 66 for controlling the in-camera 91, and an attached circuit PCB 67 connected by FPC. It is a module. In the first sub PCB 62 and the main PCB 63, a built-in memory, a baseband LSI, a power supply control IC, a sound source IC, an RF reception LSI, an RF transmission LSI, a power amplifier, a switch IC, and the like are allocated and arranged.
Although not included in the integrated module, an out camera 93 and a control circuit 94 for controlling the out camera 93 are also arranged in the electronic device.

  The first sub PCB 62 and the main PCB 63 are connected by the FPC 83. At the connecting portion between the FPC 83 and the first sub PCB 62 and the second sub PCB 63, both end portions of the FPC 83 are bent. The connector 73 which has the same structure which has the press member and holding member similar to the housing | casing 20 shown in FIG.

  The main display 61 and the first sub PCB 62 are electrically connected by two FPCs 81a and 81b. In the main display 61, the two FPCs 81a and 81b are divided into a liquid crystal panel side and an LED 90 side, and are connected to a connector 71 having a common structure on the first sub PCB 62.

  The first sub PCB 62 and the sub display 64 are connected to each other via the connector 72 by the FPC 82. The first sub PCB 62 and the in-camera control PCB 66 are connected via the connector 74 by the FPC 84. The first sub PCB 62 and the attached circuit PCB 67 are connected by the FPC 85 via the connectors 75 and 76. The main PCB 63 and the antenna 65 are connected via the connector 78 by the FPC 86.

  In FIG. 4, although the display is simplified, the end portions of the FPCs 81a, 81b, 82, 84, 85, 86 are all bent, and the connectors 71, 72, 74, 75, 76 are all implemented. It has the same pressing member and holding member as the case 20 in the first embodiment.

As described above, the connector having the same structure as that of the housing 20 of the first embodiment is bent on the end portion of the flexible printed wiring board, and the electronic device including the wiring board module that is an integrated module, and thus the wiring board module. By incorporating it, it is possible to realize a module and an electronic device in which the electrical connection portion has high reliability and few failures. In particular, when used in a mobile phone as an electronic device, high reliability can be exhibited according to downsizing and thinning.
Electronic devices include mobile phones, cameras such as digital cameras and video cameras, portable audio players, portable DVD players, and portable notebook computers.

  The structure of the embodiment of the present invention disclosed above is merely an example, and the scope of the present invention is not limited to the scope of these descriptions. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  The present invention can be used for electronic devices such as mobile phones, cameras such as digital cameras and video cameras, portable audio players, portable DVD players, and portable notebook computers.

It is a perspective view which shows roughly the structure of FPC (flexible printed wiring board) which concerns on Embodiment 1 of this invention. 1 is a perspective view schematically showing a structure of a housing according to Embodiment 1. FIG. (A), (b) is sectional drawing which shows the state before and behind attaching FPC to a housing | casing in order. It is a perspective view which shows the connection relation of the various wiring board modules built in the electronic device which functions as a mobile telephone based on Embodiment 2, and a wiring board module. It is a side view of the connector terminal arrange | positioned at a general ZIF connector.

Explanation of symbols

10 PCB (mother board)
11 Rigid board 12 Wiring (first conductor layer)
20 Housing 21 Main body (holding member)
21a Insertion port 21b Engagement part 22 Lid (pressing member)
23 engaging portion 25 bearing 26 rotating shaft 30 FPC (flexible printed wiring board)
30a Engagement part 31 Base film 32 Wiring (second conductor layer)
33 Coverlay 35 Reinforcement plate Rtp Tip part Rop Opposite part

Claims (5)

A mother board on which a first conductor layer is formed;
A flexible printed wiring board on which a second conductor layer is formed;
A holding member for holding the flexible printed wiring board in a state in which a tip portion thereof is bent and the first conductor layer and the second conductor layer are in contact with each other;
A pressing member that applies a pressing force to the bent portion of the flexible printed wiring board;
A wiring board assembly comprising: The wiring board connector according to claim 1,
A wiring board connector, wherein a gap exists between the tip portion and a portion facing the tip portion of the flexible printed wiring board in a state where the flexible printed wiring board is bent. In the wiring board connector according to claim 1 or 2,
The flexible printed wiring board is a wiring board connector having a reinforcing plate provided on the back side of the second conductor layer forming surface. The wiring board connector according to any one of claims 1 to 3,
An electronic component mounted on at least one of the mother board and the connected wiring board;
Wiring board module equipped with.   An electronic device comprising the wiring board module according to claim 4.

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