Membrane keyboard/keypad with arrangement for uniformly lighting keys from background
US7608792B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 2008 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | Nov 17, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2221/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Membrane keyboard for notebook computer and membrane keypad for cellular phone are provided. For the former, the membrane keyboard includes a frame board comprising units having an aperture; transparent keys comprising a bottom peg; resilient bridge structures on the frame board secured to the bottom of the corresponding key and comprising a central opening; insulative elastic members comprising a downward stem and a top cup; a film circuit board comprising LEDs; a transparent light guide film plate on the film circuit board and comprising bottom light diffusing areas under keys and each having a conductive member raised from center of one of different cavities; and a base board with the film circuit board fastened thereon. The elastic member is secured onto the corresponding light diffusing area and is inserted through the aperture and the opening with the cup securely put on the peg so that the keys may light uniformly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.