Coil-shaped flexible printed circuit board
US5747743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1995 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Feb 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/1105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.