Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
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
Armitage, Jr. John D.
Routt, Jr. Wilson M.
Griffin Donald A.
International Business Machines
Rohrer Charles E.
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