JPH09181401A - Method for using flexible printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the handling during transfer, extract a desired circuit conductor to the side without trouble during the actual use and reduce the material loss. SOLUTION: In the non-interconnection area between a circuit conductor 24 and a circuit conductor 23 arranged next to it, a plurality of cutting guide slits 25 are formed intermittently along the longitudinal direction of the circuit conductors 21 24 from the edge to the middle of the interconnection board 30. The flexible printed board 30 is transferred under the condition that the circuit conductor 23 and the circuit conductor 24 are connected through the non-interconnection area between them. In the actual use, the non-interconnection area is cut along the slit 25 to form a branch area that includes the area from the middle to the edge of the circuit conductor 24, the branch area is bent to the side and the circuit conductor 24 is bent in the middle and is extracted to the side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for using a flexible printed wiring board used in a flat wire harness for automobiles and the like.

[0002]

2. Description of the Related Art Some wire harnesses for automobiles require a circuit structure in which a desired circuit is bent in the middle of a plurality of circuits arranged in parallel and pulled out to the side.

When such a circuit structure is realized by a flexible printed wiring board such as an FPC, generally, as shown in FIG. 4, circuit conductors 1 to 4 corresponding to the above circuit pattern are formed on a strip-shaped film F. This is performed by printing, covering the upper surface with another strip-shaped film F, and then removing the unnecessary portion 5 shown by the imaginary line in the figure.

On the other hand, in recent years, a technique has been proposed in which a desired circuit conductor portion is folded back and pulled out to the side. For example, as shown in FIG. 5, in the non-wiring region between the desired circuit conductor 14 among the four circuit conductors 11 to 14 arranged in parallel and the adjacent circuit conductor 13, the circuit conductor 1
A cut portion 15 is formed from the end portion of the flexible printed wiring board 20 along the longitudinal direction of 1 to 14 by a predetermined amount, whereby a branch region 14a including a region from the middle to the end portion of a desired circuit conductor 14 is formed. Is formed.

In actual use, as shown in FIG.
The branch area 14a is folded back to the side, whereby the circuit conductor 14 is bent halfway and pulled out to the side.

[0006]

However, in the flexible printed wiring board 10 shown in FIG.
Is formed so as to branch, the branching region 4
There is a problem in that many unnecessary film portions 5 are generated around a in the vicinity of a as shown by the imaginary line in FIG.
In addition, since the branched region 4a has a narrow width and extends linearly, when a large number of flexible printed wiring boards 10 are stacked and conveyed, the branched region 4a may be separated and entangled during conveyance, It was necessary to carry out the transfer work carefully.

On the other hand, in the flexible printed wiring board 20 shown in FIG. 5, since the circuit conductors 11 to 14 are arranged in parallel, the circuit conductors 11 to 14 can be well arranged in the strip-shaped region and the material loss can be reduced. Although possible, branch area 1
Since 4a extends in a thin linear shape, the problem of complicated handling during transportation cannot be solved as described above.

The present invention solves the above-mentioned problems of the prior art, is easy to handle at the time of transportation, and allows the desired circuit conductor to be pulled out to the side without any hindrance during actual use, and moreover, the material loss can be reduced. It is intended to provide a method of using a wiring board.

[0009]

According to the present invention, a plurality of circuit conductors arranged in parallel are covered with a film, and a desired circuit conductor among the plurality of circuit conductors and a circuit conductor adjacent thereto are provided. In the non-wiring region, a plurality of cut guide holes are intermittently formed from the end of the wiring board to an intermediate position along the longitudinal direction of the circuit conductor, and during transportation, the desired circuit conductor and the circuit conductor adjacent thereto are formed. While and is conveyed in a state of being connected via a non-wiring region between them, in actual use, along with forming a branch region containing the desired circuit conductor by cutting along the cutting guide hole, By folding back the branch area to the side, the desired circuit conductor is bent halfway and drawn out to the side.

[0010]

According to the method of using the flexible printed wiring board of the present invention, the desired circuit conductor and the adjacent circuit conductor are connected to each other through the non-wiring region between them during transportation, and the branched region is formed. Since there is no such thing, the transfer work becomes easy. Further, in actual use, a branch area can be formed simply by cutting the non-wiring area along the plurality of cut guide holes, and by folding back the branch area, a desired circuit conductor can be pulled out to the side without any trouble. Moreover, since the flexible printed wiring board can be formed with a plurality of circuit conductors arranged in parallel, material loss can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A method of using a flexible printed wiring board according to an embodiment of the present invention will be described below. FIG. 1 is a plan view showing a flexible printed wiring board 30 according to the present invention. As shown in the figure, this flexible printed wiring board 30 has four circuit conductors 21 to 24 printed in parallel on a strip-shaped film F and covered so that another strip-shaped film F can be attached thereto. Formed. In this case, a part of the region including the circuit conductors 21 to 23 is removed at one end of the flexible printed wiring board 30, and the end position of the region is set back from the end position of the region including the circuit conductor 24. It is formed.
Further, the circuit conductor 24 and the circuit conductor 23 arranged next to the circuit conductor 24.
In the non-wiring region between and, a plurality of cutting guides are intermittently provided along the longitudinal direction of the circuit conductors 21 to 24 from an end position of the wiring board 30 to an intermediate position (position where the circuit conductor 24 is bent). Slits 25 are formed.

When carrying the flexible printed wiring board 20, the flexible printed wiring board 30 is carried while the circuit conductor 23 and the circuit conductor 24 are connected via the non-wiring region between them.

When actually used, a connector or the like is attached if necessary, and then the non-wiring region is cut along the slit 25 as shown in FIG. The branch region 24a including the region is formed. Subsequently, as shown in FIG. 3, the branch region 24a is folded back to the side, whereby the circuit conductor 24 is bent halfway and pulled out to the side. The connector may be attached after cutting the non-wiring region along the slit 25.

This flexible printed wiring board 30 is
The desired circuit conductor 24 to be bent and the circuit conductor 23 adjacent to it
Slit guide slits 2 intermittently in the non-wiring region between
4 and FIG. 5 in the state where only 5 is formed.
Branch region 4a and branch region 1 as shown in the related art
There is no branched region such as 4a. Therefore, in this state, if a large number of flexible printed wiring boards 30 are superposed and conveyed, part of the area is not scattered and entanglement is prevented, so that the conveyance work is facilitated.

Further, since the slit 25 for the tear guide is intermittently formed in the non-wiring region between the desired circuit conductor 24 to be bent and the circuit conductor 23 adjacent to it, the slit 25 is formed in the slit 25 during actual use. Just tear the non-wiring area along
The branch area 24a including the desired circuit conductor 24 can be easily formed, and the desired circuit conductor 24 can be pulled out to the side without trouble by folding back the branch area 24a.

Moreover, the flexible printed wiring board 3 is printed by printing the circuit conductors 21 to 24 arranged in parallel.
Since 0 can be formed, unnecessary portions of the non-wiring region can be reduced and material loss can be reduced.

In the above embodiment, the slits 25 are formed intermittently in the non-wiring region, but an oval hole or
You may form a perfect circular hole intermittently. The point is that the tear guide holes may be formed intermittently to the extent that the non-wiring region can be easily separated.

Further, in the above embodiment, the circuit conductor 24 arranged on the outermost side of the flexible printed wiring board 30.
However, the circuit conductor 22 or 23 arranged in the center may be pulled out to the side. In that case, the tear guide holes are intermittently formed in the non-wiring regions on both sides of the center circuit conductor 22 or 23, and the circuit conductor is provided along the tear guide holes in actual use. The non-wiring regions on both sides of 22 or 23 may be cut to form branch regions including the circuit conductors 22 or 23, and the regions may be folded back to the side.

Needless to say, the total number of circuit conductors and the number of circuit conductors drawn out to the side are not limited to those in the above embodiment.

[0020]

As described above, according to the method of using the flexible printed wiring board of the present invention, the desired circuit conductor and the adjacent circuit conductor are connected through the non-wiring region between them during transportation. Since there is no branch region, the transfer work can be easily performed. Further, in actual use, a branch area can be formed simply by cutting the non-wiring area along the plurality of cut guide holes, and by folding back the branch area, a desired circuit conductor can be pulled out to the side without any trouble. Moreover, since the flexible printed wiring board can be formed in a state in which a plurality of circuit conductors are arranged in parallel, the effect of reducing material loss can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining a method of using a flexible printed wiring board that is an embodiment of the present invention.

FIG. 2 is a plan view for explaining how to use the same as above.

FIG. 3 is a plan view for explaining how to use the same as above.

FIG. 4 is a plan view showing a conventional example.

FIG. 5 is a plan view showing another conventional example.

FIG. 6 is a plan view of another conventional example in an actual use state.

[Explanation of symbols]

 30 Flexible Printed Wiring Board 21-24 Circuit Conductor 24a Branch Area 25 Slit

Claims (1)

[Claims] 1. A plurality of circuit conductors arranged in parallel are covered with a film, and in a non-wiring region between a desired circuit conductor and a circuit conductor adjacent to the desired circuit conductor among the plurality of circuit conductors,
A plurality of tear guide holes are intermittently formed from the end of the wiring board to an intermediate position along the longitudinal direction of the circuit conductor, and during transport, the desired circuit conductor and the adjacent circuit conductor are located between them. While it is conveyed in a state of being connected through the non-wiring region, while in actual use, it is torn along the tear guide hole to form a branch region including the desired circuit conductor, and the branch region is located on the side. A method of using a flexible printed wiring board, characterized in that the desired circuit conductor is bent in the middle so as to be pulled out to the side by being folded back.