Hard base key unit
US7250937B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Feb 9, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2229/048
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A first object is to provide a key unit capable of preventing a problem that a key top gets under a key window frame of a casing of a movable telephone or the like during key pushing down, and capable of preventing floating of the key top and interferences with movements between keys in a narrow-pitch key board which cannot employ a key window frame. A second object is to provide a key unit of a novel thin structure, capable of eliminating a dual structure where an light guiding plate is superposed as a separate component. A hard base key unit comprises a hard base made of a hard resin plate and having a through hole on a plane thereof, a key pad made of a rubber-like elastic body film to cover the through hole 1 of the hard base, a switch thrusting projection formed integrally with the key pad on a plane of the key pad facing the inside of the through hole, and a key top made of a hard resin and provided at a position corresponding to the switch thrusting projection on the other plane of the key pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.