Processes for manufacturing flexible wiring boards and the resulting flexible wiring boards
US6729022B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Oct 18, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49155
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention aims to connect metal films without forming any opening in a resin film.Against a first resin film 16 formed on a first metal film 12 are pressed bumps 21 on a second metal film 11 so that the bumps 21 are embedded into the first resin film 16. Either one of the first metal film 12 or the second metal film 11 or both is (are) patterned while the bumps 21 are in contact with the first metal film 12, and the first resin film 16 is heat-treated while the top of the first resin film is partially exposed to discharge the solvent or moisture from the exposed zone and cure the first resin film 16. After curing, the bumps 21 and the first metal film 12 may be ultrasonically bonded to each other. A second resin film and a third metal film may be further layered to form a multilayer structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.