JPS60157287A - Flexible electronic 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 Field of Industrial Application The present invention relates to a flexible electronic circuit board using a flexible electrically insulating base material used for electrical circuit wiring of small and lightweight electronic devices such as cameras, video cameras, etc. It is.

Structures of conventional examples and their problems In recent years, there has been a demand for electronic devices to be smaller and lighter9, and as one means of achieving this, flexible electronic circuit boards using flexible electrically insulating base materials have been widely used. It's coming.

A conventional flexible electronic circuit board will be described below with reference to the drawings.

Figures 1, 2, and 3 are cross-sectional views of conventional double-sided connection structures of flexible electronic circuit boards, with Figure 1 using through holes, Figure 2 using eyelets, and Figure 3 showing connecting members. 1 is a flexible electric insulating base material, 2a and 2b are electric circuits formed of metal conductors, and 3
Reference numerals a, 3b, and 3c denote connection conductors used in each double-sided connection structure, and the operation of the flexible electronic circuit No. 1 (board) constructed as described above will be described below.

In the through hole shown in Fig. 1, i-;;+
(A conductor 3a made of materials such as silver and copper is formed to achieve connection on both sides, and in the case of 7 in Figure 2, an eyelet 3d is similarly attached to the through hole 4 of the board to connect on both sides. In the case of the connection member shown in Fig. 3, the board is provided with a shear split groove or a grooved hole, and the connection member is inserted into this hole, and the two are electrically connected by means such as soldering. .

However, in the above-mentioned configuration, there are many processing steps, which is complicated and increases the cost. Another problem was that the reliability of electrical continuity was low.

Purpose of the Invention The purpose of the present invention is to simplify the processing of through-hole drilling, attaching and caulking work, and inserting connecting members in order to obtain electrical continuity in the vertical direction of a double-sided flexible electronic circuit board. It is an object of the present invention to provide a flexible electronic circuit board that enables a significant cost reduction effect and highly reliable electrical continuity to be obtained.

Structure of the Invention The present invention is a flexible electronic circuit double-sided board in which metal conductor circuits are formed on both sides of a flexible electrically insulating base material. It is characterized by obtaining electrical continuity in the vertical direction of the double-sided circuit board, and the shear cut and raised shape is such that two tongue pieces are cut and raised perpendicularly to the board so that the tongue pieces are parallel to each other. As a result, the melted solder during soldering in the solder bath rises along both walls of the two tongues due to capillary action, reaches the metal conductor on the top surface, and can establish electrical continuity between the front and back surfaces.

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

FIG. 4 shows a perspective view of a sheared and raised portion of a flexible electronic circuit board according to an embodiment of the present invention, and FIG. 5 shows a partially cutaway perspective view of the sheared and raised portion after soldering. In Figures 4 and 5, 1 is a flexible electrically insulating base material, 2a and 2b are metal conductor circuits, 5 is solder, and the two sheared and raised tongue pieces are perpendicular to the board. Lift up and the tongues are parallel to each other.

The operation of the flexible electronic circuit board of this embodiment configured as described above will be explained below.

A flexible electronic circuit double-sided board can be cut and raised at any desired position to create chip parts or disk IJ-
When soldering is performed using a solder bath after the parts are installed, the molten solder rises due to capillary action along both walls of the two cut-out tongues and reaches the metal conductor circuit on the top surface.
Electrical continuity between the front and back surfaces can be obtained.

As described above, according to this embodiment, by using the shear cut-and-raise structure, highly reliable electrical continuity between both sides can be realized at the same time as soldering of electronic circuit components. In the above embodiment, the direction of shearing and raising is upward with respect to the solder surface of the solder tank, but the direction of cutting and raising the tongue piece is not limited to the upper direction, and the same function can be achieved even if the tongue is cut and raised downward. It is.

Effects of the Invention As is clear from the above explanation, the present invention has a shear cut and raised shape in which two tongue pieces are cut and raised perpendicularly to the substrate as shown in Fig. 4, so that the tongue pieces are positioned parallel to each other. Because of this structure, the processing is very simple, and there is no need for through-hole processing, eyelet installation caulking work, or insertion of connecting members as in the conventional example, making it possible to significantly reduce costs. Further, an excellent effect of high reliability of electrical continuity can be obtained.

[Brief explanation of the drawing]

1, 2 and 3 are cross-sectional views of a conventional flexible electronic circuit board, and FIGS. 4 and 5 are perspective views of a double-sided connection structure of a flexible electronic circuit board according to an embodiment of the present invention, and FIG. 3 is a partially cutaway perspective view after soldering. 1...Flexible electrical insulating base material, 2a, 2b--metal conductor circuit, 3a...through hole, 3b-eyelet, 3C
... Connection member, 4 ・ Board through hole, 5 ...
·solder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4 Figure 5

Claims (1)

[Claims] Holes are formed by shear cutting in a double-sided flexible electronic circuit board in which metal conductor circuits are formed on both sides of a flexible electrically insulating base material. At the same time as soldering of electronic circuit components using a solder bath, holes are formed vertically on the double-sided flexible electronic circuit board. A flexible electronic circuit board characterized by obtaining electrical continuity in a direction.