High efficiency linear light source
US5335158A · kind A · utility
38Cited by
9References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1992 |
| Grant date | Aug 2, 1994 |
| Priority date | — |
| Expiry date | May 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/02493
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A linear light source for a film scanner is disclosed which includes an elongated light integrating cavity, formed within a solid illumination body, having diffusely reflective walls. Light is introduced into the cavity through an input port, and an output beam of diffuse light is produced through a slot which is generally parallel to the longitudinal axis of the integrating cavity. In order to increase the efficiency of the light source, light is introduced into the cavity through a high collection non-imaging optical device formed as a hollow bore within the illumination body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.