Magnifying key switch
US5635927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Nov 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2221/002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A key switch includes a rubber key body mounted within a key switch hole on a key pad device above a circuit board thereof, and a key cap fastened to the rubber key body at the top and depressed to move the rubber key body downward in triggering a contact on the circuit board, wherein the key cap is made from a plastic convex lens having a convex top wall and a plain bottom wall, the plain bottom wall having a light-blocking area and a light-penetrable area, the light-penetrable area being shown in the form of a pattern; the rubber key body is molded from a vulcanized rubber sealed to the plain bottom wall of the key cap through a heat sealing process. Three layers of ink are disposed between the key body and the key cap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.