Apparatus for compensation for spectral fluctuation of a light source and a scanner incorporating said apparatus
US6219140A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1998 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Dec 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/603
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention discloses an apparatus for compensation for spectral fluctuation of a light source. Additionally the invention discloses a scanner incorporating the apparatus for compensation. A lamp generates light, which is sent into a light directing device. From the light directing device a sensor means and a spectral monitor means for determining the spectral content of the light from said lamp receive the light. A signal processing means receives the output from said spectral monitor means and said sensor means for producing a signal compensated for spectral fluctuations. A scanner, incorporating the inventive apparatus, additionally comprises a medium for scanning which is positioned between said sensor means and said light directing device and a lens is positioned between said medium for scanning and said sensor means, for imaging said medium onto said sensor means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.