Mechanical key switch for a membrane keyboard
US5324902A · kind A · utility
12Cited by
3References
1Claims
0Family size
Inventor
Key dates
| Filing date | Jun 21, 1993 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Jun 21, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2235/002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A mechanical key switch for a membrane keyboard including a key cap supported on an actuating spring member by a compression spring and made to slide on a key body vertically, the actuating spring member having a unitary, arched bridge plate in the middle, which curves inwards to trigger an electrical signal and simultaneously to produce a click sound upon pressing of the key cap against the compression spring, and curves outwards to return the key cap and simultaneously to produce a click sound upon releasing of the key cap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.