Keyboard switch
US4508942A · kind A · utility
39Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1983 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Nov 28, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2215/008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A membrane keyboard with a circuit means having a plurality of snap action domes formed therein has a cover sheet thereon. A plurality of cavities formed between the cover sheet and the domed circuit layer has air passages connecting each cavity with the ambient environment. The structure of the present invention permits lower tensile force during actuation and results in improved snap action and tactile feel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.