Lighting device with central symmetry for a dial
US7038976B2 · kind B2 · utility
8Cited by
12References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2005 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | Sep 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G9/0041
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light source (15) is housed in a housing (6) of a case, underneath the dial (10) opposite a guide (17) directing the light onto a reflector (20), formed in a hollow in the internal or external face of a crystal (1) the thickness of which decreases regularly from the center to the periphery thereof for reorienting the light by total internal reflection into the crystal (1) until it emerges towards the dial (10) when the maximum refractive index is exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.