Key structure
US7541554B2 · kind B2 · utility
50Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2007 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Sep 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2225/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A key structure comprises a membrane circuit, a substrate, a cover and a press element. The membrane circuit comprises at least one first signal generator and a second signal generator. The substrate is disposed below the membrane circuit to support the membrane circuit. The cover comprises a body and at least one protrusion, wherein the protrusion is disposed on the body corresponding to the first signal generator. The press element is disposed on the second signal generator, wherein when force is applied on the cover, the protrusion presses the first signal generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.