JP3007244U - Flexible wiring board connection structure - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Does not require advanced technology associated with soldering or thermal bonding of anisotropic conductive films, does not cause secondary defects due to reassembly or reassembly, and is compact Provided is a flexible wiring board connection structure capable of being thinned. [Structure] This flexible wiring board connecting structure connects an electrode 7 of a flexible wiring board 3 and an electrode 6 of another board 5 via an electric connecting member 4 having a hole 10 for positioning.
It is fixed by compression with the positioning pin 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is useful for electrically connecting a flexible wiring board to another board in a liquid crystal module such as a mobile phone, a calculator, a pager, or a multi-chip module of a large-scale computer. This relates to the connection structure of the wiring board.

[0002]

[Prior art]

 Conventionally, in the above-mentioned field of use, etc., in order to electrically connect a flexible wiring board to another board or the like, either soldering the respective connection terminals or thermally bonding them using an adhesive anisotropic conductive film, Alternatively, a structure for mechanically connecting with a flat cable connector was adopted.

[0003]

[Problems to be solved by the device]

 However, the connection structure by soldering the connection terminals and heat-bonding the adhesive anisotropic conductive film requires high technology, is not efficient in working, and once connected, the liquid crystal module, multi-chip module, Furthermore, if there is a problem with the PCB, it is difficult to reassemble and reassemble, and there is a risk of secondary defects such as peeling of the PCB connection pattern. In addition, the connection structure that uses a connector for a flat cable has a limit to downsizing and thinning of the device, and it is difficult to reduce the pitch of the terminals of the connector as compared with the reduction of the pitch of the connecting terminals of the flexible wiring board. there were. Therefore, the purpose of the present invention is to eliminate the need for advanced technology associated with soldering and thermal bonding of anisotropic conductive films, to prevent secondary defects due to reassembly and reassembly, and to reduce the size and thickness of equipment. A flexible wiring board connection structure that can be performed is provided.

[0004]

A flexible wiring board connection structure (hereinafter, simply referred to as a connection structure) according to the present invention is separated from an electrode of a flexible wiring board through an electric connection member having a positioning hole. Characterized in that the electrodes of the substrate are compressed and fixed by positioning pins, or in the thickness direction of the insulating elastic member, a large number of conductive members, especially the peripheral portion of the positioning hole, are formed. Except for the electrodes of the flexible wiring board, they are embedded via the electrical connection member that has a positioning hole that is embedded corresponding to the position of the electrode to be connected and has an adhesive layer on one or both sides. It is characterized in that the electrodes of the substrate are compressed and fixed by the positioning pins.

Next, the connection structure of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of the connection structure, FIG. 2 is a perspective view thereof, FIG. 3 is a perspective view from the opposite direction of FIG. 2, and FIGS. 4 (a) and 4 (b) are electrical connections used in the connection structure. It is a top view about the embodiment from which a part differs. In these figures, 1 is a fixture for the liquid crystal module 2, 3 is a flexible wiring board, 4 is an electrical connection member, 5 is a board such as PCB, 6 is an electrode thereof, and 7 is an electrode of the flexible wiring board 3. The electrical connection member 4 comprises an insulating elastic member 8, a conductive member 9, a positioning hole 10 and an adhesive layer 11. Reference numerals 12 and 13 denote fixing claws and positioning pins provided on the fixture 1, and 14 and 15 denote positioning holes of the substrate 5 and insertion holes of the fixing claws 12, respectively.

The connection structure of the present invention is a structure in which the electrode 7 of the flexible wiring substrate 3 such as a liquid crystal module and the electrode 6 of the substrate 5 such as PCB are compression-connected via the electric connection member 4. This electric connecting member 4 is connected in the thickness direction of the insulating elastic member 8 as a base material, except for a plurality of rows of a large number of conductive members 9 such as thin metal wires, especially except for the peripheral portion 16 of the positioning hole 10. The electrode is embedded corresponding to the position of the electrode, and the adhesive layer 11 is provided on one or both surfaces of the electrode. In these compression connections, first, the flexible wiring board 3 and the electric connection member 4 are arranged between the fixture 1 of the liquid crystal module 2 and the board 5, and then the electric connection member 4 is aligned with the board 5. The adhesive layer 11 is used for adhesion, the flexible wiring board 3 is wound under the fixture 1, and the electrode 7 at the tip thereof is placed between the two positioning pins 13 provided on the lower surface of the fixture 1. , The electric connecting member 4 and the substrate 5 are mounted on the positioning pin 13 while aligning the holes in the holes 10 and 14, respectively, and the electric electrode 7 is pressed against the fixture 1 by the electric connecting member 4 and fixed. The tab 12 is passed through the hole 15 of the board 5 and hooked on the lower surface of the board 5, or if the board 5 and the fixture 1 have a space, the fixture 7 and the substrate 5 are riveted or screwed to each other. Done by . At that time, the compression amount of the electrical connecting member 4 for connecting the electrode 7 of the flexible wiring board 3 and the electrode 6 of the substrate 5 stably and reliably is preferably about 0.2 to 0.4 mm, which is less than 0.2 mm. In that case, a stable connection cannot be obtained, and in the case of 0.5 mm or more, the conductive member 9 such as the thin metal wire of the electric connecting member 4 may be bent. If the conductive member 9 is tilted at about 45 °, the connection can be surely made with a lower compression amount than the above.

As described above, in the connection structure of the present invention, the conductive member 9 such as a thin metal wire compresses and connects the electric connection member 4 embedded in the insulating elastic member 8. As the electrode 6 and the electrode 7 of the flexible wiring board 3, for example, a gold plating electrode, a solder plating electrode, a carbon electrode or the like is used, and among these, a gold plating electrode or a solder plating electrode is preferable. As the metal thin wire as the conductive member 9 of the electrical connecting member 4, for example, a gold wire, a copper wire, a brass wire, a phosphor bronze wire, a nickel wire, a stainless wire, etc. can be used, but they have good conductivity and are relatively good. Inexpensive brass wire or phosphor bronze wire is preferable, and particularly when low resistance is required, the brass wire or phosphor bronze wire may be plated with gold, and the wire diameter is preferably 30 to 50 μm. The arrangement of the conductive members 9 may be appropriately selected depending on the width, pitch, etc. of the electrodes 7 of the flexible wiring board 3 or the electrodes 6 of the board 5 in accordance with the positions of the electrodes to be connected. For example, if the electrode pitch is as low as 0.2 mm or 0.3 mm and the electrode width is as low as 0.1 mm or 0.15 mm, the number of electrodes should be 0.05 to 0.1 mm as shown in Fig. 4 (a). In order to make a stable connection, the number of rows should be 3-5 rows depending on the size of the electrodes, or the electrode pitch should be 0.4 mm or more and the electrode width should be 0.2 mm or more. In the case of a coarse pitch, as shown in Fig. 4 (b), the conductive members 9 should be arranged at an interval of about 0.1 to 0.4 mm at an interval of about 0.1 to 0.4 mm, and about 4 to 10 per electrode should be arranged, and the number of electrodes should be set. You can do this.

A silicone-based or epoxy-based adhesive is screen-printed on one surface or both surfaces of the electrical connection member 4 so that the electrodes 7 of the flexible wiring board 3 and the electrodes 6 of the substrate 5 can be easily positioned. It is preferably provided by spray coating or the like. However, considering the workability of adhering to the substrate 5 such as PCB, it is better to provide the adhesive only on one side. Further, it is preferable that the electric connection member 4 is provided with a positioning hole 10 or a notch (not shown). Furthermore, if the conductive member 9 such as a thin metal wire is not embedded in the positioning hole 10 or the peripheral portion 16 of the cutout, the end portion of the conductive member 9 will be compressed and connected. It is more preferable because it does not bend to cause a leak. Further, since the electric connecting member 4 is used after being compressed, the insulating elastic member 8 in which the conductive member 9 such as a thin metal wire is embedded is natural rubber, silicone rubber, isoprene rubber, styrene rubber, butadiene rubber, butyl rubber. Examples thereof include nitrile rubber, ethylene / propylene / diene rubber, acrylic rubber, urethane rubber, and fluororubber. Among these, silicone rubber, which has excellent heat resistance, environmental resistance and mechanical properties, is most preferable.

[0009]

【Example】

 Hereinafter, specific embodiments of the present invention will be described with reference to examples. The flexible wiring board 3 of the liquid crystal module 2 is gold-plated with an electrode pitch of 1.0 mm, an electrode width of 0.5 mm, an electrode length of 2.0 mm, and the number of electrodes is 20, and two positioning holes φ 2 mm are provided. There is. Further, two positioning pins 13 (φ 1.8 mm, length 1.2 mm) for the electrical connecting member 4 are provided at the center of the polypropylene fixture 1 at intervals of 25 mm. Further, there are fixing tabs 12 at the four corners of the fixing tool 1 for compressing the electrical connection member 4 and fixing the substrate 5 such as PCB. The length of the fixing tabs 12 is 0.3 mm in compression amount. Dimensioned as 1.1mm. There is a substrate such as an electrode 6 (solder plating treatment) having the same pitch as the electrodes 7 of the flexible wiring substrate 3 on the surface of the substrate 5 such as a PCB, and the electric connection member 4 with an adhesive on one side is placed on the electrode 6 and positioned. Align and bond with PCB. At that time, if a mark for positioning or the like is printed on the substrate 5, it can be easily incorporated. As the adhesive, a silicone adhesive KR-120 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied by screen printing to a thickness of 20 μm.

The flexible wiring board 3 is turned to the lower surface side of the fixture 1 of the liquid crystal module 2, the tip is inserted between the two positioning pins 13, and the positioning hole 10 for the electrical connection member 4 and the board Insert the positioning pin 13 into the positioning hole 14 of the connector 5, press the electrode 7 of the flexible wiring board 3 toward the fixture 1 side by these, and hook the fixing tab 12 on the lower surface of the board 5. Thus, the electrical connection member 4 with the adhesive was compressed by 0.3 mm to connect the electrode 7 of the flexible wiring substrate 3 and the electrode 6 of the substrate 5 to each other. Since the electrical connection member 4 has a relatively large pitch and the electrode width of both electrodes 7 and 6 of the flexible wiring board 3 and the board 5, a gold plated brass wire of φ40 μm is used as the conductive member 9 and an insulating elastic member 8 is used. In the insulating silicone rubber, the same pitch as the electrode pitch was 1.0 mm, and 10 electrodes were arranged at 0.1 mm pitch in the electrode length direction per electrode. As the insulating silicone rubber, silicone rubber KE-1978A / B (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) having a rubber hardness of 20 ° H was used. The electrical connection member 4 of this embodiment has a width of 3.0 mm, a length of 26.0 mm (arrangement of the conductive members 9 excluding the peripheral portion 16 of the positioning hole 10: 10.0 mm), a thickness of 1.0 mm, and a positioning hole 10. Had a shape with two φ2 mm. By connecting in this way, the electrodes can be connected stably and securely, the device can be made thin and small, the number of parts is reduced, and the advantages of reassembly and repair are obtained.

[0011]

[Effect of device]

 According to the flexible wiring board connection structure of the present invention, the electrical connection can be obtained by simply compressing and fixing the electrode of the flexible wiring board and the electrode of the substrate such as the PCB via the electrical connection member, and thus the conventional connection is achieved. Since the soldering work and the adhesion of anisotropic conductive film by thermocompression bonding, which are required in 2., are not required, the man-hours for assembling work are greatly reduced, and the work efficiency and quality are improved. In addition, the liquid crystal module and the substrate can be separated by simply removing the fixture of the liquid crystal module from the substrate, and the liquid crystal module and the substrate can be easily reassembled and changed. Moreover, since a flat cable connector or the like is not used to connect the electrodes of the flexible wiring board to the electrodes of the board, there is an advantage that the space inside the device can be saved and the device can be made smaller and thinner.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an example of a flexible wiring board connection structure of the present invention.

FIG. 2 is a perspective view of a connection structure of the flexible wiring board shown in FIG.

FIG. 3 is a perspective view from the opposite direction of FIG.

4 (a) and 4 (b) are plan views of different embodiments of the electrical connection member used in the flexible wiring board connection structure of the present invention.

[Explanation of symbols]

1 ... Fixing tool (of liquid crystal module), 2 ... Liquid crystal module, 3 ... Flexible wiring board,
4 ... Electrical connection member, 5 ... Substrate,
6 ... (substrate) electrode, 7 ... (flexible wiring substrate) electrode, 8 ... Insulating elastic member, 9 ...
Conductive member, 10 ... Hole for positioning (of insulating elastic member), 11 ... Adhesive layer, 12
… Fixing tabs (of the fixture), 13… positioning pins,
14… Positioning holes (on board), 15…
Holes for inserting fixing claws, 16 ... (peripheral hole for positioning the insulating elastic member).

Claims (4)

[Scope of utility model registration request] 1. A flexible wiring board, characterized in that an electrode of a flexible wiring board and an electrode of another board are compressed and fixed by a positioning pin through an electric connecting member having a positioning hole. Connection structure. 2. The insulating elastic member is embedded in the thickness direction of the insulating elastic member at a position corresponding to an electrode to which the conductive member is connected,
An electrode of a flexible wiring board and an electrode of another board are compressed and fixed by a positioning pin through an electric connection member having an adhesive layer provided on one or both sides thereof for positioning. Flexible wiring board connection structure characterized by: 3. The flexible wiring board connection structure according to claim 2, wherein the conductive member is embedded in the insulating elastic member except for the peripheral portion of the positioning hole. 4. The positioning pins are mutually positioned by positioning holes provided in each of the electrical connection member and the electrode of the substrate, and then inserted into these positioning holes. 2. The flexible wiring board connection structure according to 2.