JPS58130587A - Flexible circuit board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible wiring board that is constructed by connecting two or more hard reinforcing plates to a flexible wiring board.

In recent years, in order to effectively utilize the space inside electronic devices,
Electric circuits have come to be constructed using flexible wiring boards.

Hereinafter, such a conventional wiring board will be explained with reference to the drawings.

FIG. 1(-) is a plan view of a conventional flexible wiring board, and FIG. 1(b) is a sectional view thereof. In FIG. 1, reference numeral 1 denotes a flexible wiring board having a copper conductor network 2 formed on one side, and 3 an electronic part connected to the conductor network 2 by soldering. A hard plate 4 is bonded to the other surface of the wiring board 1 to increase the mechanical strength of the wiring board 1.

The flexible wiring board constructed as described above is used by being bent along the dotted line AA' as necessary.

However, when such a printed wiring board is bent along the dotted line A-A/, the part of the wiring board 1 where the hard plate 4 is not bonded to the lower surface, that is, the part of the wiring board 1 that is responsible for bending near the dotted line A-A/ The bending stress is applied to the end of the portion 1a, and cracks may occur if the end of the bent portion 1a comes into contact with the end of the bent portion 1a when inserting an electronic component or installing it in an electronic device body.

Furthermore, a crack occurs at the end of the bent portion 1a, and the
- If the crack expands, the problem of disconnection of the conductor network 2 also occurs.

In view of the above drawbacks, the present invention provides a flexible wiring board that can prevent cracks from occurring at the ends of the bent portions by providing reinforcing conductor members at the ends of the bent portions of the flexible wiring board.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2(,) is a plan view of a flexible wiring board according to an embodiment of the present invention, and FIG. 2(0)) is a sectional view thereof.

In FIG. 2, the reference numeral 1 designates a flexible wiring board having a conductor network 2 formed on one side thereof, and the reference numeral 3 designates an electronic component soldered to the conductor network 2. A hard plate 4 is bonded to the other surface of the wiring board 1 to increase the mechanical strength of the wiring board 1. Reference numeral 6 denotes a copper reinforcing conductor portion provided on the wiring board 1 at the same time as the formation of the conductor circuit network 2 at the extreme end of the bent portion 1a of the wiring board 1, and is not involved in the electrical circuit.

Even if the flexible wiring board configured as described above is bent along the dotted line AA' as necessary, the reinforcing conductor portion 6 is provided at the end of the bent portion 1a, so that
Thereafter, when inserting the electronic component or installing it in the main body of the electronic device, there is no possibility of contacting and damaging the end of the bent portion 1a, so that cracks occurring at the extreme end of the bent portion 1a can be prevented.

As mentioned above, at the end of the bent portion 1a of the wiring board 1,
By forming the reinforcing conductor portion 5 on the wiring board 1 at the same time as the conductor network 2, it is possible to prevent cracks occurring from the extreme ends of the bent portions 1a of the wiring board 1, and furthermore to prevent disconnection of the conductor network 2. can.

In this embodiment, the bent portion 1 on one side of the wiring board 1
Although the reinforcing conductor portion 5 is provided at the extreme end of the wiring board 1, the strength will be further increased if the reinforcing conductor portion 5 is provided on both sides of the wiring board 1.

Further, in this embodiment, the reinforcing conductor portion 6 is provided at the end of the bent portion 1a, but even if the reinforcing conductor portion 5 is provided between the conductor network 2 and the end of the bent portion 1a, the reinforcing conductor portion 6 and the bent portion 1a may be Although a crack occurs between the ends of the conductor network 1a, the crack does not extend to the conductor network 2, and breakage of the conductor network 2 can be prevented.

As described above, the present invention provides a reinforcing conductor member that does not participate in the electrical circuit at the same time as forming a conductor circuit network on one or both sides of the bent end of a flexible wiring board that is not provided with a hard plate. By providing this, it is possible to prevent cracks from occurring from the edges of the bent portion of the wiring board, and the reinforcing conductor member need only be formed at the same time as the conductor network without the need to provide it, which has a great practical effect. There is.

[Brief explanation of drawings]

FIG. 1 (,) is a plan view of a conventional flexible wiring board, FIG. (b) is the same sectional view. 1... Wiring board, 2... Conductor cape road network, 4
......Hard plate, 6...Reinforcement conductor part. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
figure

Claims (1)

[Claims] It includes a flexible wiring board, a conductor circuit network formed on one or both sides of the wiring board, and a rigid board bonded to one or both sides of the wiring board and provided with a gap between them. A flexible wiring board, characterized in that a reinforcing conductor member that does not participate in the electrical circuit is formed on one or both sides of the bent end of the wiring board where the hard plate is not provided, at the same time as the conductor circuit network. .