Light guide for a communication unit
US6550927B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 2000 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Oct 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72502
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication unit including a light guide for illuminating a display including a substantially transparent plate-formed element with reception means for receiving light from light sources and for guiding the light into the transparent plate-formed element of the light guide. The reception means includes light in-coupling surfaces each facing towards a light source and being substantially parallel with a main surface of the light guide. The reception means includes a lens and a diffuser, for dispersing the light substantially parallel with the main surface of the light guide to illuminate the display. The light guide also has means for illuminating a keyboard. The means to illuminate the keyboard includes keyholes through the light guide, the keyholes having chamfered surfaces for reflecting the light in the light guide perpendicular to the surface of the light guide onto the keyboard. The light guide also incorporates a dome sheet having a reflector sheet attached to one side of the light guide and a keyboard flexibly attached to another side of the light guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.