Keyboard system and module therefor
US4559427A · kind A · utility
11Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Oct 19, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2223/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A keyboard system comprises a circuit board having a matrix of contact switches. A module comprises a matrix of keys in actuating correspondence with the contact switches. The keys are of a resilient elongated form having at the terminus an upwardly projecting contact button and a pair of downwardly projecting pegs. One peg contacts a contact switch for actuation thereof. The other peg is receivable in a recess in the circuit board for maintaining alignment of the key. The module also forms a support for an overlying membrane wherein manual depressing of selective locations of the membrane actuates a corresponding contact switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.