JPH03257985A - Printed wiring board - Google Patents

Abstract

PURPOSE:To facilitate the bending work and improve the positional accuracy in bending by providing a through hole at the section where a circuit is not made out of the bending part of a printed wiring board. CONSTITUTION:Eight circuits are made, by removing the unnecessary part of a copper foil, at the laminated plate lined with copper, where copper foils are stuck together with an adhesive to a polyimide film. Next, to protect the circuits, the circuits are covered with a polyimide film fitted with adhesive, and then the outline of the product is stamped out with a die, and is made into a flexible printed wiring board. Next, a through hole is bored with a drill at the section where the conductor does not exist at the bending part of this flexible printed wiring board. When bending this flexible printed wiring board, it can be bent accurately along the through hole.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flexible printed wiring board.

[Conventional technology]

Conventionally, the structure of the bent portion of a printed wiring board having a flexible insulating base material, a conductor circuit, and a flexible insulating coating is as shown in Figure 3, by printing at the bending position. A structure in which a marking is made with ink and this part is folded, or a structure in which a convex marking part is provided integrally with at least one circuit and this part is folded in order to indicate the folded part, as shown in Figure 4. is disclosed in Japanese Patent Application Laid-Open No. 61-206288.

[Problem to be solved by the invention]

However, the structure shown in FIG. 3 has the problem that the number of steps is increased because the bending position is printed. In addition, the structure shown in Figures 3 and 4 has the problem that it is difficult to accurately bend at the bending marking part because the load required for bending is the same at the bending marking part and at other parts. was there.

The present invention provides a printed wiring board folding structure that simplifies the folding operation and improves the folding position accuracy.

[Means to solve the problem]

The wiring board of the present invention is a printed wiring board that has a flexible insulating base material, a conductor circuit, and a flexible insulating coating, and has a part that requires bending and does not have a conductor circuit. As shown in FIG. 1, a special feature in which a through hole is provided in the printed wiring board is provided in the folded portion of the printed wiring board where no circuit is formed, and the printed wiring board is bent along the through hole. conduct.

The shape of the through hole in the present invention may be circular, elliptical, triangular, square, or any other shape. However, for work reasons, it is preferable to avoid complex shapes.

[Effect]

Since through-holes are provided in the bent portion of the printed wiring board, when the printed wiring board is bent, the portion with the through-hole bends with a smaller load than the portion without the through-hole, making the bending work easier. Also, the bending position can be accurately bent along the through hole.

[Example] An embodiment of the present invention is shown in FIG.

A conductor with a width of 0.5cm and a length of 100cm is placed on a copper-clad laminate made of polyimide film and copper foil pasted with adhesive.
．． Eight circuits are formed by etching away unnecessary parts of the copper foil using a five-pin pinch.

Next, in order to protect the circuit, the circuit is covered with an adhesive-backed polyimide film, and then the outer shape of the product is punched out using a mold to form a flexible printed wiring board. Next, nine through holes of φ0.6 are drilled in the bent portion of this flexible printed wiring board where there is no conductor. This hole may be opened when punching out the outer shape of the product using a die. With the structure of the bent portion obtained in this way, it was confirmed that when the flexible printed wiring board was bent, the work was easier than before, and the bending position was also accurate along the through hole.

〔Effect of the invention〕

As is clear from the above explanation, the structure in which through holes are provided in the parts of a bendable printed wiring board that require bending processing simplifies the bending work of the bendable printed wiring board and improves the accuracy of the bending position. It is possible to plan.

[Brief explanation of drawings]

FIG. 1 is a top view showing one embodiment of the present invention, FIG. 2 is a top view showing a folded wiring board of the present invention, FIGS. 3 and 4 are top views showing a conventional example, and FIG. 7 to 7 are top views showing other embodiments of the present invention. Explanation of symbols 1 Printed wiring board 3 Through hole 5 Convex marking 2 Conductor 4 Printed marking

Claims (1)

[Claims] 1. In a printed wiring board that has a flexible insulating base material, a conductive circuit, and a flexible insulating coating, a through hole is provided in a place that requires bending and does not have a conductive circuit. A printed wiring board characterized by: