JPS6151893A - Flexible printed 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 printed wiring board used for wiring electronic circuits.

[Conventional technology]

Conventionally, the entire base of a flexible printed wiring board used for wiring electronic circuits is made of heat-resistant polyimide or polyester.

Furthermore, in order to form a conductive pattern on such a base material, the copper foil once formed has been etched to form a predetermined circuit pattern. .

[Problem that the invention seeks to solve]

However, polyimide and polyester used as base materials for flexible printed circuit boards are expensive and material costs have increased. In addition, since the conductive pattern is formed on the base material by etching, the manufacturing process involved in the etching process requires a lot of effort, which raises the problem of increasing the manufacturing cost of the flexible printed wiring board.

In addition, since polyimide or polyester is used as the entire base material, stress is applied to restore the flexible printed wiring board to its original shape when the flexible printed wiring board is bent, making it difficult to bend the board.

In view of the above, an object of the present invention is to provide a flexible printed wiring board that has good flexibility and can be manufactured at low cost.

[Means for solving problems]

In the present invention, the base material of the flexible printed wiring board is a flexible base material made of insulating synthetic fibers, and the circuit pattern formed on this base material is obtained by printing conductive ink in a predetermined pattern.

[Effect]

In the present invention, since insulating fibers are used as the base material, the base material is resistant to tearing and tearing due to external forces.In addition, since the conductive pattern is formed by printing, there is no need for an etching process to obtain the conductive pattern from the manufacturing process. omitted.

〔Example〕

Hereinafter, one embodiment of the flexible printed wiring board of the present invention will be described with reference to FIGS. 1 to 4.

(1) indicates a base material of a flexible printed wiring board, and this base material (1) is made of warp threads (2) and weft threads (3) made of insulating synthetic fibers, such as polyester. Here, (4) is an insulating adhesive layer that bonds these together.

Further, (5) is an insulating layer made of a urethane sheet, and this insulating layer (5) has an insulating adhesive layer (
4).

In addition, (6), (7), and (8) show conductive patterns obtained by applying conductive ink.

Next, an example of the manufacturing process (51) of this embodiment will be explained.

First 1. Necessary parts of the warp (2) and weft (3) made of indispensable synthetic IR fibers such as polyester are coated with an insulating adhesive +4
1, and an insulating layer (5) made of, for example, a urethane sheet is adhered to the negative side (FIG. 2).

Next, screen print conductive ink in a predetermined pattern,
Screen print conductive patterns (6), (7) and (8). In this case, the jj4 electroconductive ink penetrates between the insulating synthetic fiber threads f2+ (31) (Fig. 3, 1).

Next, in order to resist the parts other than those used for electrical connection, solder resist (9) and αα are applied (Fig. 4), and then the process moves to the drilling process of 111 (number of holes 1 (111G21) (Fig. 5). ).The song process is the same as for conventional flexible printed wiring boards.

In the flexible printed notation board of this embodiment as well, predetermined electronic components are wired using conductive patterns and land portions formed of conductive ink, as in the conventional case.

As described above, according to one embodiment of the present invention, the conductive pattern is formed using the conductive ink on the base material using the insulating adhesive λ and IL. Compared to conventional flexible printed circuit boards that have a base material formed on them, it can be manufactured and supplied at a lower cost.

Furthermore, since the base material (fl) is woven with warp threads (2) and weft threads (3), a flexible printed wiring board that is resistant to cutting and tearing due to external forces can be obtained. In addition, circuit patterns can be easily formed by applying conductive ink without going through the troublesome chemical etching process.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be taken without departing from the gist of the present invention.

〔Effect of the invention〕

Since the present invention prints conductive ink in a predetermined pattern on a base material made of insulating synthetic fibers, the material cost is lower than in the past, and the conductive ink of the circuit pattern can be printed without an etching process. There is an advantage in that a flexible printed wiring board can be manufactured at low cost because the parts can be formed. In addition, since the base material is made of synthetic tlR fiber, it is strong against cutting and tearing due to external force, and has the advantage of being usable even in places where conventional flexible printed wiring boards cannot be used, where they are frequently bent and twisted.

Figure 1 is a sectional view showing one embodiment of the flexible printed wiring board of the present invention, and Figures 2, 3, 4, and 5 are examples shown in Figure 1, respectively. FIG. 3 is a diagram showing an example of a manufacturing process.

(1) is the base material, (2) is the warp, (3) is the weft, +61
(71 and (8) are conductive patterns made of conductive ink.

Figure 1 Figure 2 Figure 3 Figure 4 50th

Claims (1)

[Claims] A flexible printed wiring board characterized by having conductive ink printed in a predetermined pattern on a base material made of insulating synthetic fibers.