JPH0548372U - Flexible circuit board connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] A conductive metal member is adhered to the flexible circuit board in order to ground a predetermined wiring pattern of the flexible circuit board, and is formed on the conductive metal member. Provided is a flexible circuit board connection structure in which a ground connection structure is provided between the wiring pattern and a conductive metal member by crimping and crimping means of a burr portion. A burr portion 2 is formed to project on a conductive metal member 1 to be grounded, and the projecting burr portion 2 is inserted into a land hole 7 of a land portion 6A of a wiring pattern 6 to be grounded on a flexible circuit board. As described above, the burr portion 2 is crimped and crimped to the land portion 6A in a state where the flexible circuit board is adhered to the upper surface of the conductive metal member 1, so that the wiring pattern 6 and the conductive metal member 1 are separated from each other. Form a ground connection structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a conductive metal member is caulked to ground a predetermined wiring pattern formed on a flexible circuit board to electrically connect the wiring pattern and the conductive metal member. The present invention relates to a connection structure for a flexible circuit board.

[0002]

[Prior Art]

 In this type of flexible circuit board, as shown in FIG. 4, a desired wiring pattern 6 is formed on one surface of a flexible insulating substrate 4 such as a polyimide film by etching means for copper foil or the like. Generally, a surface protective layer 3 made of a resin film member suitable for insulating the wiring pattern 6 is applied to the upper surface of the wiring pattern 6.

Such a flexible circuit board has an advantage that the wiring pattern 6 can be formed with a high degree of freedom and that the entire structure can be made thin and lightweight. It is extremely suitable as a wiring means for some electronic devices.

By the way, when a flexible circuit board as described above is mounted on a device, as a means for grounding a predetermined wiring pattern 6 and providing a reinforcing function at the time of mounting, it is shown in FIG. The flexible circuit board is adhered to an appropriate conductive metal member 7, and the solder 10 is attached to the land hole 7 formed in the land portion 6A of the wiring pattern 6 so that the conductive metal member 9 and the wiring pattern are formed. In addition to the structure for achieving electrical continuity between the wirings 6, the back surface of the conductive metal member 9 to which the flexible circuit board is attached as shown in FIG. 5 is placed on the metal chassis 12 of the device, and the wiring pattern is formed. The wiring pattern 6 and the conductive metal member 9 are electrically connected to each other by mounting the screw 13 in the hole 11 commonly formed at the land portion 6A of the connector 6 and fastening the screw 13 to the metal chassis 12. There is a method to connect to.

[0005]

However, according to the ground connection structure with the solder 10 as shown in FIG. 4, a soldering step for that is required, and the conductive metal member 9 has a flexible circuit board. If the adhesive or the like used when bonding is adhered to the land hole 7, the solder 10 does not sufficiently adhere to the conductive metal member 9 and a conduction failure occurs.

Further, the ground connection structure using the screw 13 as shown in FIG. 5 causes an increase in the number of parts and an increase in the number of steps, which is a costly method.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, when a through hole is formed on the side of a conductive metal member to be grounded, a burr portion is formed so as to project around the through hole so that a wiring pattern of a flexible circuit board to be grounded can be formed. The flexible circuit board is attached to the upper surface of the conductive metal member so that the protruding burr portion is inserted into the land hole of the land portion. The present invention provides a connection structure for a flexible circuit board configured to establish a ground connection between the wiring pattern and the conductive metal member.

[0008]

【Example】

 Hereinafter, the present invention will be further described with reference to the illustrated embodiments. FIG. 1 is a conceptual cross-sectional configuration diagram of a flexible circuit board connection structure according to the present invention. The flexible circuit board is, as described above, one side of the flexible insulating substrate 4. The wiring pattern 6 formed on the wiring pattern 6 and the surface protection layer 3 covering the upper surface of the wiring pattern 6 are formed, and the land hole 7 is formed in the exposed land portion 6A of the wiring pattern 6. There is.

Reference numeral 1 is a suitable conductive metal member such as an aluminum plate, and the flexible circuit board is attached to the conductive metal member 1 with an adhesive agent on the flexible insulating substrate 4 side. And, the burr portion 2 formed when the through hole 5 is provided in the conductive metal member 1 is mounted in the land hole 7 of the flexible circuit board, and the burr portion 2 is crimped to the land portion 6A. Thus, the predetermined wiring pattern 6 is grounded to the conductive metal member 1 through the land portion 6A and the burr portion 2 crimped and crimped.

To form the burr portion 2 on the conductive metal member 1 for obtaining the ground connection structure as described above, an appropriate punching tool 8 is used as shown in FIG. When the through hole 5 is formed from a predetermined position on the direction surface, the burr portion 2 is formed so as to project around the through hole 5 along the penetrating direction at that time. Therefore, as shown in FIG. 3, the flexible circuit board and the conductive metal member 1 are adhered to each other with the protruding burr portion 2 inserted in the land hole 7 in the flexible circuit board, and then the land is formed. By simply crimping the burr portion 2 protruding from the hole 7 onto the surface of the land portion 6A, a ground connection structure between the flexible circuit board and the conductive metal member 1 as shown in FIG. 1 can be easily obtained. You can

In the above-mentioned flexible circuit board connection structure, the conductive metal member 1 serves as a counterpart member for grounding a predetermined wiring pattern 6 of the flexible circuit board, and also has flexibility. It also functions to partially reinforce the circuit board.

[0012]

[Effect of the device]

 According to the flexible circuit board connection structure of the present invention, a burr portion is formed on a conductive metal member for grounding, and the burr portion is caulked to form a predetermined wiring pattern on the flexible circuit board. Since it is pressure-bonded to the land portion of the mold, an electrically and mechanically reliable ground connection structure can be easily formed between the predetermined wiring pattern and the conductive metal member.

Even if the adhesive used for attaching the flexible circuit board and the conductive metal member to the land hole of the flexible circuit board seeps out, the caulking crimping means does not cause connection failure or the like. It is possible to reliably obtain the ground connection structure as described above.

The conductive metal member functions as a counterpart member for grounding a predetermined wiring pattern, and also has an advantage of partially reinforcing the flexible circuit board.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a flexible circuit board connection structure according to the present invention.

FIG. 2 is an explanatory view of manufacturing a conductive metal member used in the present invention.

FIG. 3 is a view in which a flexible circuit board is attached to a conductive metal member according to the present invention.

FIG. 4 is a cross-sectional configuration diagram of a main part of a conventional flexible circuit board connection structure.

FIG. 5 is a cross-sectional configuration diagram of a main part of another conventional connection structure for a flexible circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive metal member 6A Land part 2 Burr part 7 Land hole 3 Surface protective layer 8 Punching tool 4 Flexible insulating base material 9 Conductive metal member 5 Through hole 10 Solder 6 Wiring pattern 12 Metal chassis

Claims (1)

[Scope of utility model registration request] 1. A structure for electrically connecting a predetermined wiring pattern of a flexible circuit board to a conductive metal member for grounding, wherein a burr portion is projectingly formed on the conductive metal member. Through holes, land holes for inserting the burrs into the lands of the wiring pattern, the burrs into the lands, and the flexible surface on the upper surface of the conductive metal member. It is characterized in that the wiring pattern and the conductive metal member are electrically connected by crimping the burr portion and crimping it to the land portion with the flexible circuit board mounted. Flexible circuit board connection structure.