JPH0351983Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a printed wiring circuit member used for electronic components and the like, and particularly to a printed wiring circuit member formed by bending a flexible printed circuit board.

[Conventional technology]

4 to 6 illustrate a conventional membrane switch, in which FIG. 4 is a plan view and FIG. 5 is a printed lead portion 3 of a flexible printed circuit board 1.
FIG. 6 is a plan view showing the printed lead portion 6 of the membrane switch of FIG. 5 in a further bent state.

The flexible printed circuit board 1 is based on a flexible insulating film made of polyester material, and a switch contact portion 2 formed by printing is provided on this insulating film. The switch contact parts 2 are respectively connected to the print leads 4 of the print lead part 6,
Further, the printed leads 4 are connected to corresponding lead terminal portions 5 and are bundled. print lead 6
is bent twice to form the terminal extraction portion 3.

In this way, conventionally, the back side of the lead terminal section 5 of a membrane switch was taken out and the printed lead section 6 was bent when configuring the switch.

[Problem that the invention attempts to solve]

However, if the printed lead portion 6 of the printed circuit board 1 is bent twice in an overlapping manner as shown in FIG. Furthermore, problems such as damage to the insulating film that forms the base of the substrate 1 have arisen.

Therefore, an object of the present invention is to provide a printed wiring circuit member that does not cause disconnection of the conductive pattern or damage to the film that forms the base of the board even if the flexible printed board is bent twice to form four layers. It is in.

[Means for solving problems]

In order to achieve the above object, the present invention folds and stacks flexible printed circuit boards on which conductive patterns are formed along a first fold line, and
In a printed wiring circuit member formed by further folding and overlapping the overlapped portions along a second fold line, the first fold line and the second fold formed by each bending of the substrate A notch is provided at the intersection of the line of sight to prevent disconnection of the conductive pattern and damage to the board even when the flexible printed circuit board is folded in double overlapping fashion.

〔Example〕

Figures 1 to 3 show embodiments of the present invention;
The figure is a plan view showing the state before the printed lead part 6 of the membrane switch printed circuit board is bent.
The figure is a plan view showing a state in which the printing lead part 6 is bent once, and FIG. 3 is a perspective view showing a state in which the printing lead part 6 is further bent.

In the figure, the same reference numerals are given to the same components as in the conventional example, and detailed description thereof will be omitted.

In the figure, 7 is a notch provided in the printed lead portion 6 of the flexible printed circuit board 1, and this notch 7 is provided on the second fold line 9.
8 is a first folding line that serves as an index for the first bending of the printed lead portion 6 of the substrate 1.

The cutout portion 7 is formed to cross the first fold line 8 of the substrate 1 and parallel to the printed lead 4, and is formed in the shape of an elongated slit so as not to obstruct the conductive pattern (printed lead 4).

Therefore, when using a membrane switch by taking out the back side of the lead terminal section 5 of the membrane switch and forming the terminal extraction section 3, the first fold line should be aligned so that the printed leads 4 of the printed lead section 6 are on the upper side. 8 in an overlapping manner, and further folded in a double overlapping manner along the second fold line 8 so that the printed lead part 6 is halved.
Disconnection of the conductive pattern on the printed circuit board 1 and damage to the film forming the base of the printed circuit board 1 can be prevented.

[Effect of idea]

As described above, the flexible printed circuit boards on which conductive patterns are formed are folded and stacked along the first fold line, and the stacked parts are further folded and stacked along the second fold line. In the printed wiring circuit member, by providing a notch at the intersection of the first fold line and the second fold line formed by each bending of the board, the flexible printed circuit board can be formed into four layers. Even if the circuit board is bent so that It has the following effects.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a substrate of a membrane switch showing an embodiment of the present invention, Fig. 2 is a plan view showing a state in which the above board is bent once, and Fig. 3 is a perspective view showing a state in which the above board is further bent. It is a diagram. 4 and 5 are both plan views showing the conventional example, and FIG. 6 is a perspective view of the conventional example. DESCRIPTION OF SYMBOLS 1... Flexible printed circuit board, 2... Switch contact part, 3... Terminal extraction part, 4... Printed lead, 5... Lead terminal part, 6... Printed lead part, 7... Notch part, 8... ...First crease line, 9...Second crease line.

Claims (1)

[Scope of utility model registration request] In a printed wiring circuit member, flexible printed circuit boards on which conductive patterns are formed are folded and stacked along a first fold line, and the stacked parts are further folded and stacked along a second fold line. . A printed wiring circuit member, wherein a notch is provided in the flexible printed circuit board at the intersection of the first fold line and the second fold line formed by each bending of the board.