Method and apparatus for synchronizing the polarization control signal of an AC-polarized arc-discharge lamp with the exposure timing signals of a CCD line sensor
US5495361A · kind A · utility
4Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1995 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | May 8, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/193
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for synchronizing the line time and color channel exposure timing signals of a CCD line sensor with the polarization control signal of an AC-polarized arc-discharge lamp in a scanning system. The scanning system comprises a scanner illumination system, including an AC-polarized arc-discharge lamp, for illuminating a document to be scanned, and a scanner imaging system for scanning the illuminated document in a line-wise manner. The scanning system of the present invention is designed to minimize brightness fluctuations on the document being scanned, improving the quality of the scanned image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.