Backlighting inductive touch buttons
US8408723B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2010 |
| Grant date | Apr 2, 2013 |
| Priority date | — |
| Expiry date | Apr 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/9655
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Backing lighting of induction touch keys is accomplished with a spacer layer surrounding an inductive touch sensor coil and a light source on a substrate, and light transmissive layer having a suspended metal disk proximate to the inductive touch sensor coil. A protective fascia may be placed over the light transmissive layer and spacer layer. When the light transmissive layer is displaced toward the inductive touch sensor coil the impedance value of the inductive touch sensor coil changes and the change is detected. Materials used that are translucent (light transmissive) may be continuous and solid, and opaque materials may have openings therein for transmission of light therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.