Thin key sheet
US7705256B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2006 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Jul 15, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2227/004
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Mobile phones are in a trend of having thinner configuration due to emphasis on the design. Thus, in order to meet this demand, the present invention aims to thin the key sheet portion as much as possible. The present invention provides a thin key sheet 1 comprising a key top 2 made of a metal or a resin having on the front surface or the back surface indications such as letters, symbols, graphics or the like indicating the functions of keys, a key pad 3 made of a material having rubber elasticity such as a silicone rubber or various elastomers for supporting/fixing the key top, an EL element 8 formed on the back surface of the key top by means of printing, and a printed circuit board 5 on which a switch element is provided at its surface for turning ON/OFF of an electric circuit by the pressing of the key top 2 and on which a circuit pattern involved therewith is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.