Compound curved concentrator based illuminator
US7593143B2 · kind B2 · utility
9Cited by
21References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2005 |
| Grant date | Sep 22, 2009 |
| Priority date | — |
| Expiry date | Apr 23, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A document illuminator comprising a light-transmissive element having nonlinear walls. The walls are shaped in the form of a compound parabolic concentrator with an optically inverted configuration. A diffusive optical source receives light from a side emitting LED embedded therein and redirects it to an aperture along with other light rays that go through total internal reflection from the nonlinear walls. The reflected light rays that are collected at the aperture are in turn transmitted at high power and uniform luminescence to illuminate a document for scanning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.