Composite optical interference filter for use in film scanner system
US5099359A · kind A · utility
15Cited by
7References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1990 |
| Grant date | Mar 24, 1992 |
| Priority date | — |
| Expiry date | Sep 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/285
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A composite optical interference filter is used in a film scanning system having a high speed CCD imager. Multiple, alternating, variable thickness layers of higher and lower index thin film oxides deposited on an optically transmissive substrate constitute the filter and enable the filter to provide color balance, notch rejection, and IR rejection all in the same device. Three such filters in a lamphouse of the film scanning system can be selected to match the system spectral response of the CCD imager and the film thereby providing equal density and color balance of the images on the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.