Interference film filter for copying machine

Details Interference film filter for copying machine Interference film filter for copying machine

1989-10-13

1992-08-18

Arnold, Bruce Y.

Optical: systems and elements

Light interference

Produced by coating or lamina

359589, 359587, 355 71, G02B 528, G03B 2772

Patent

active

051404648

ABSTRACT:
An interference film filter for use in a copying machine as mounted on an optical path of light traveling through an image-forming lens for preventing transmission of the light in a predetermined wavelength range. The filter comprises a transparent glass substrate, and interference films each consisting of a plurality of layers formed by vapor deposition on the substrate. The interference films include a film disposed centrally of the substrate, and an opposed pair or pairs side films. Each of the side films has a greater optical film thickness than the center film or a film disposed immediately inwardly.

REFERENCES:
patent: 1878857 (1932-09-01), Kitroser
patent: 2742819 (1956-04-01), Koch et al.
patent: 3410626 (1968-11-01), Magrath
patent: 3892490 (1975-07-01), Uetsuki et al.
Jenkins, Francis A., and White, Harvey E., Fundamentals of Optics, N.Y., McGraw-Hill, 1957, pp. 6-7.

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