Reflective color filter for color correction of photodetector filters
US5665963A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1996 |
| Grant date | Sep 9, 1997 |
| Priority date | — |
| Expiry date | Jan 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/513
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A color filter system for an optical system, applicable to optical systems in color image scanners, copiers, video cameras and digital cameras. The optical system includes a photosensor army, transmissive color filters on the photosensor array and a corrective reflective filter adjacent to the photosensor array. The transmissive color filters on the photosensor array are imperfect, transmitting too much visible red as well as infrared. The adjacent reflective filter compensates by suppressing longer visible red wavelengths and infrared wavelengths. The combination provides color precision with cost and manufacturing advantages relative to attempting to provide precise transmissive filters on the photosensor array or relative to providing compensation filters elsewhere in the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.