Light guide for a display or keyboard
US5746493A · kind A · utility
46Cited by
10References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Mar 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2219/062
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide for illuminating a display and/or keyboard device is formed from translucent material as a planar element having a peripheral edge. A plurality of arcuately shaped light coupling recesses are formed on one side to transmit light from light sources substantially uniformly into the light guide. A plurality of light reflecting recesses are formed in the peripheral edge to reflect light at the edge back into the light guide in a manner useful for illuminating the keys of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.