Composite optical interference filter for use in film scanner sy

Details Composite optical interference filter for use in film scanner sy Composite optical interference filter for use in film scanner sy

1990-09-11

1992-03-24

Arnold, Bruce Y.

Optical: systems and elements

Light interference

Produced by coating or lamina

359589, 2502081, 250226, 2502272, 358474, 358 80, G02B 110

Patent

active

050993593

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.

REFERENCES:
patent: 3085468 (1963-04-01), Henin
patent: 4709144 (1987-11-01), Vincent
patent: 4826286 (1989-05-01), Thornton, Jr.
patent: 4884868 (1989-12-01), Bohm
patent: 4899040 (1990-02-01), Davis et al.
patent: 5012346 (1991-04-01), DeJager et al.
patent: 5032004 (1991-07-01), Steinle
Department of Defense; Military Standarization Handbook--Optical Design, Section 20, pp. 20-1-20-94, 1962.

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