Structure of the keypad for keyboard
US5406277A · kind A · utility
15Cited by
5References
2Claims
0Family size
Inventor
Key dates
| Filing date | Apr 12, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Apr 12, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2233/086
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved keypad includes a plurality of apertured bases in the keyboard, a pressing rod and a keypad for each of the apertured bases. The pressing rod has opposing projected tracks and the apertured base has slots on its interior wall. This structure allows the pressing rod to be housed inside the apertured base so as to reduce the friction during the keypad operation. The reduction of friction provides a smooth keyboard operation. Moreover, the gap between the exterior wall of the pressing rod and the interior wall of the aperture base is wider, therefore, the keypad resonance is lessened during operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.