JPS58130588A - 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 is applied to a flexible wiring board which 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(a) 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 and is used to increase the mechanical strength of the wiring board 1.

The 7-lexiple wiring board configured as described above is used by being bent along the dotted line A-A' as necessary.

However, when such a printed wiring board is bent at points # to - to', the portion of the wiring board 1 where the hard plate 4 is not bonded to the bottom surface, that is, the part of the wiring board 1 that is responsible for bending near the dotted line A-A'. Bending stress is applied to the end of the bent portion 1a, and electric heat is generated 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. Further, when electric heat is generated at the end of the bent portion 1a and the electric heat expands, a problem arises in that the conductor network 2 is disconnected.

In view of the above-mentioned drawbacks, the present invention provides a flexible wiring board that can prevent electric heat generated from the ends of the bent portion by providing a notch at the end of the bent portion of the flexible wiring board. An embodiment of the present invention will be described with reference to the drawings.

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

In FIG. 2, reference numeral 1 denotes a flexible wiring board having a copper conductor network 2 formed on one side, and 3 an electronic component soldered to the conductor network 2. In FIG. 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 semicircular notch provided at the end of the bent portion 1a of the wiring board 1, and the cutout of the notch is cut out from the position where the hard plate 4 is joined to the lower surface. Reference numeral 6 denotes a reinforcing copper conductor portion that is provided on the wiring board 1 along the cutout portion 5 at the same time as the conductor network 2 is formed, and is not involved in the electrical circuit.

Even if the flexible wiring board configured as described above is bent along the dotted line A-A' as necessary, the end of the bent portion 1a is notched, so that it can be easily inserted into electronic components or inserted into the main body of an electronic device. Fold part 1 when installing
Since there is no possibility of contacting and damaging the edge of the folded portion 1a, no electric heat is generated at the edge of the folded portion 1a.

Furthermore, even if electric heat is generated at the notch 6, the reinforcing conductor 6
Since the electric heating is stopped, there will be no disconnection in the conductor network 2.

As described above, the notch 6 is provided at the end of the bent portion 1a of the wiring board 1, and the reinforcing conductor part 6 is formed on the wiring board 1 along the notch 6 at the same time as the conductor circuit network 2. Preventing electric heat generated from the edge of the bent portion 1a of the plate 1,
Furthermore, disconnection of the conductor network 2 can be prevented.

In this embodiment, the semicircular notch 6 is provided at the end of the bent portion 1a, but it goes without saying that the notch 6 may have any shape.

As described above, the present invention provides, at the end of the bent portion of a flexible wiring board that is not provided with a hard plate, a cutout portion whose cut end extends out from the part where the hard plate is provided. As a result, it is possible to prevent electric heat generated from the bending portion of the wiring board, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1(a) is a plan view of a conventional flexible wiring board, FIG. 1(b) is a sectional view thereof, and FIG. 2(a) is a plan view of a flexible wiring board according to an embodiment of the present invention. Figure (b)
is the same sectional view. 1... Wiring board, 2... Conductor circuit network, 4
...Hard plate, 6...Notch, 6...
・Reinforced conductor part. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 s

Claims (2)

[Claims] (1) A flexible wiring board, a conductor circuit network formed on one or both sides of the wiring board, and a first conductor network connected to one or both sides of the wiring board and provided with a gap between them. ．． a second hard plate; At the end of the bent portion of the wiring board where the second hard board is not provided, the first. A flexible wiring board characterized in that a notch is cut out from a portion where a second hard board is provided. (2) The flexible wiring according to claim 1, characterized in that a reinforcing conductor portion that does not participate in the electrical circuit is formed on one or both sides of the wiring board along the notch at the same time as the conductor circuit network. Board.