JPH0518053U - Printed wiring board - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a printed wiring board capable of making a wiring pattern at an end portion of a coverlay hard to be cut. In a printed wiring board in which a wiring pattern 2 is printed on a surface of a substrate 1 made of a flexible plate material and a part of the wiring pattern 2 is covered with a cover lay 4, end portions 6, 7 of the cover lay 4 are formed. The width of the wiring pattern 2 located at is wider than the width of other portions.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a flexible printed wiring board (hereinafter referred to as FPC) composed of a flexible plate material.

[0002]

[Prior Art]

 Conventionally, an FPC in which wiring patterns are printed on both the front surface and the back surface has been constructed as shown in FIGS. 2 and 3. In the figure, wiring patterns 2 and 3 are formed by printing on the front surface and the back surface of a substrate 1 made of a flexible plate material, respectively. The wiring patterns 2 and 3 are covered with coatings (hereinafter referred to as coverlays) 4 and 5, respectively, to protect the wiring patterns 2 and 3 and to insulate them from the outside.

However, when the FPC is bent, if the cover lays 4 and 5 are provided on both sides, the rigidity increases and it becomes difficult to fold. Therefore, the cover lay 4 is not provided at the position of the valley of the bent portion. It may be structured. In this case, since the wiring pattern 2 has a uniform thickness in the past, when the wiring pattern 2 is thin, the boundary portions 6 and 7 between the portion where the coverlay 4 is provided and the portion where the coverlay 4 is not provided are provided. There was a risk that a certain wiring pattern 2 would break.

[0004]

[Problems to be solved by the device]

 As described above, the conventional FPC has a problem that the wiring pattern at the boundary between the portion where the coverlay is provided and the portion where the coverlay is not provided is easily cut.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a printed wiring board in which the wiring pattern at the end portion of the coverlay is not easily cut.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a printed wiring in which a wiring pattern is printed on a surface of a flexible plate material and a part of the wiring pattern is covered with a film. In the plate, the width of the wiring pattern located at the end of the coating film is made wider than the width of other portions.

[0007]

[Action]

 According to the above configuration, when the printed wiring board is bent at the portion not covered with the coating film, the width of the wiring pattern at that portion is wide, so that it is difficult to cut.

[0008]

【Example】

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

FIG. 1 shows an embodiment of the present invention. In FIG. 1, parts corresponding to those of the conventional example shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. The feature of this embodiment is the shape of the wiring pattern 2. That is, when the wiring pattern 2 is wired between the portion where the coverlay 4 is provided and the portion where the coverlay 4 is not provided, the width of the wiring pattern 2 located at the boundary portions 6 and 7 is widened. .

According to this embodiment, when the FPC is bent with a portion where the coverlay 4 is not provided as a valley, the width of the wiring pattern 2 located at the boundary portions 6 and 7 is wide, and therefore, that portion is widened. The wiring pattern 2 is difficult to cut.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the width of the wiring pattern located at the coating end portion of the flexible printed wiring is widened, it is possible to prevent the wiring pattern from being cut when the printed wiring board is bent at the uncoated portion. It can be prevented from occurring and the yield of the printed wiring board can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of a printed wiring board according to the present invention.

FIG. 2 is a plan view showing the configuration of an example of a conventional printed wiring board.

3 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 substrate (flexible plate material) 2,3 wiring pattern 4,5 coverlay (coating) 6,7 boundary (end)

Claims (1)

[Scope of utility model registration request] 1. In a printed wiring board in which a wiring pattern is printed on the surface of a flexible plate material and a part of the wiring pattern is covered with a coating, the width of the wiring pattern located at the end of the coating is set. A printed wiring board characterized by being made wider than the width of other portions.