Optical system of a copying machine

Details Optical system of a copying machine Optical system of a copying machine

1979-11-08

1982-04-20

Corbin, John K.

350166, G02B 110, G02B 528

Patent

active

043256082

ABSTRACT:
In a copying machine including a halogen lamp, a CdS photosensitive medium and a transmitting type projection lens system, a 5-layer or 7-layer multi-layered interference film comprising a dielectric material is applied to a surface of the transmitting type projection lens system so that a spectral distribution comprising the spectral wavelength characteristic of the original light, the spectral transmission characteristic of the multi-layered interference film and the spectral sensitivity characteristic of the photosensitive medium superposed one upon another becomes a uniform distribution.

REFERENCES:
patent: 3143921 (1964-08-01), Russell
patent: 3594160 (1971-07-01), Gunto et al.
patent: 4218134 (1980-08-01), Kamiya et al.
I.B.M. Technical Disclosure Bulletin, vol. 15, No. 2, Jul. 1972, p. 522.

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