Optical system for copier

Details Optical system for copier Optical system for copier

1978-11-30

1980-08-19

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 11, G03B 2776, G03B 1500

Patent

active

042181348

ABSTRACT:
In a copier utilizing a halogen lamp as a light source and a CdS element as a photosensitive member and comprising a reflective lens system, a mirror contained in the reflective projection lens system is provided with a multi-layered coating of 5 to 9 layers of a dielectric substance to reduce exposure in the red wavelength range without reducing exposure in the blue and green wavelength ranges thereby matching the spectral characteristics of the light from an original with the spectral sensitivity of the photosensitive member.

REFERENCES:
patent: 3143921 (1964-08-01), Russell
patent: 3594160 (1971-07-01), Gunto et al.
patent: 3785812 (1974-01-01), Matsumoto
patent: 3841752 (1974-10-01), Terajima et al.
patent: 3869205 (1975-03-01), Gallo
patent: 4132477 (1979-01-01), Watabe et al.
I.B.M. Technical Disclosure Bulletin, vol. 15, No. 2, Jul. 1972, p. 522.

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