JPS5839088A - Flexible electric circuit substrate - 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] The present invention relates to a 7-lexiple circuit board No. ζ in which a circuit is formed by laminating a metal foil such as copper foil on the surface of a flexible synthetic resin sheet such as polyimide resin, and its object is to However, the purpose is to ensure ease of bending and to prevent components such as transistors soldered to the circuit surface from falling off when they are exposed to heat during bending.

This type of flexible electric circuit board has been prized in the field of electronic equipment (SC) because it can be used in a folded manner. However, the metal foil that forms the circuit has a certain degree of rigidity, and there is a risk of breakage or damage if it is sharply bent.Also, the stress from bending is not confined to the vicinity of the bend, but is transmitted over a long distance, so soldering There was a drawback that attached mounted components were likely to fall off. Therefore, it is necessary to mount the mounted components away from the bent portion, which has the disadvantage of increasing the size of the flexible electric circuit board used in Function C.

In order to eliminate this drawback, conventionally, as shown in Figs. 2 and 8,
Perforations (8) and notches (4) are provided in parallel at the bent portion (2) of the flexible electric circuit board (1), and the bent portion (2)
) is made easier to bend by taking advantage of stress concentration. Although this conventional product has high practicality, it has a drawback in that it requires a step of providing perforations (8) and notches (4) in the manufacturing process.

The present invention aims to eliminate the above-mentioned drawbacks, and its gist relates to a flexible electric circuit board characterized in that the width of a circuit made of metal foil is narrowed at the bent portion.

The present invention will be explained below based on illustrated examples.

Figures 1 and 2 show an embodiment of a flexible electric circuit board (1) according to the present invention.

(5) is a flexible synthetic resin sheet made of polyimide resin, usually 0.0025 to 0.7011 thick. (6) is a circuit made of copper foil, usually 0.085 m thick.
It is about the same thickness.

(7) is circuit number ζ soldered mounted components such as transistors and diodes.

(2) is a bent part, and the circuit (6) is placed in this bent part to form a narrow part (8) whose width is narrowed. Since this narrow portion (8) is formed at the same time as the circuit is formed by etching the copper foil, no additional manufacturing steps are required.

Flexible electric circuit board formed like a ridge (1)
Since stress is concentrated at the bent portion, the circuit is bent at an acute angle by utilizing this portion, and there is little possibility that the mounted components will fall off during bending. In addition, the small parts in the circuit can be formed at the same time as the metal foil circuit is formed on the flexible synthetic resin by etching and press punching, so there is no difference in manufacturing from the conventional process. There are advantages.

[Brief explanation of the drawing]

1 and 2 are perspective views showing one embodiment of the present invention, and FIGS. 8 and 4 are perspective views showing a conventional example. Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others) *IJ! 1 ”'1138 l2IIj !I 4 @ Procedural Amendment 1 1982 Patent Application No. 137464 2 Name of invention Flexible electric circuit board 3 Relationship to the person making the amendment Patent applicant address Oaza, Kadoma City, Osaka Prefecture 1048 Kadoma Name (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent Address 1048 Kadoma Oaza, Kadoma City, Osaka Prefecture (1) rO,0025J is on page 3, line 4 of the specification. Correct it as rO, 025J. (2) Correct the word "circuit" on page 3, line 17 of the specification to [possible J]. (3) In the specification, from page 3, line 20 to page 4, line 1, the phrase "by machining/notching or punching the circuit" is corrected to "by machining/notching the circuit."

Claims (1)

[Claims] (1) Surface number ζ of a flexible synthetic resin sheet such as polyimide resin A 7-lexiple circuit board in which a circuit is formed by laminating metal foil such as copper foil, and the width of the circuit is narrowed at the bent part. A flexible electric circuit board characterized by: