Illumination control system utilizing an integrating feedback detector
US4555621A · kind A · utility
6Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1983 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Jun 24, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/043
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination detector is positioned adjacent one surface of a wedge-shaped light pipe which is optically coupled to a mirror in a scanning system. The light coupled into the light pipe is representative of the illumination reflected from a document scanning plane, yet is totally internally reflected from the angled surface of the light pipe to produce a uniform, integrated illumination level at the photosensor. This photosensor output represents an exposure level used to adjust the output of a document illumination power supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.