Coil-shaped flexible printed circuit board

Details Coil-shaped flexible printed circuit board Coil-shaped flexible printed circuit board

1995-02-02

1998-05-05

Ledynh, Bot L.

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

H05K 100

Patent

active

057477434

ABSTRACT:
A coil-shaped flexible printed circuit board retains its original outer diameter unchanged without any guide or retainer. For this purpose, either the conductive pattern of copper or synthetic base material is processed to have a permanent stretch before or when the board is wound into a coil shape. A squeezing step may be employed to generate the permanent stretch on the conductive pattern. Alternatively, a heat treatment of the base material may be used to form an additional bridged ingredient after the board has been wound. The additional bridged ingredient may retain the coil shape unchanged for a long time without guiding pieces.

REFERENCES:
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patent: 4381420 (1983-04-01), Elliott et al.
patent: 4509109 (1985-04-01), Hansen
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patent: 4798918 (1989-01-01), Kabadi et al.
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patent: 5211128 (1993-05-01), Katoh et al.
patent: 5220488 (1993-06-01), Denes
patent: 5372087 (1994-12-01), Kato et al.
Patent Abstract of Japan, vol. 13, No. 99 (3447) Mar. 1989 re JP-A 63 273390.

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