Two slit illumination aperture

Details Two slit illumination aperture Two slit illumination aperture

1979-09-17

1981-04-07

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 57, G03B 2754, G03B 2770

Patent

active

042602491

ABSTRACT:
A three piece aperture comprising a centerpiece positioned much as an "island" between two outer pieces so as to form two light transmissive slits. The two outer pieces may contain symmetrical light transmission edges. The aperture is of particular use in electrophotographic copier machines where substantially continuously variable reduction is practiced.

REFERENCES:
patent: 3609037 (1971-09-01), Suzuki
patent: 3709602 (1973-01-01), Satomi
patent: 3830591 (1974-08-01), Albrecht
patent: 3961847 (1976-06-01), Turner et al.
patent: 3967894 (1976-07-01), Tsilibes
patent: 4057342 (1977-11-01), Allis
patent: 4090788 (1978-05-01), Massengeil

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