Unique copyboard having unique light attenuator

Details Unique copyboard having unique light attenuator Unique copyboard having unique light attenuator

1981-10-05

1983-06-14

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

350314, 355 77, 356235, G03B 2772

Patent

active

043879853

ABSTRACT:
A unique light attenuator is positioned between a bank of lamps and the underside of a light diffuser which supports a subject to be photographed in a process camera, such light attenuator comprising a first circular pattern of constant width, constant density lines and a second superimposed pattern of straight lines which compensate for nonuniformity of illumination of the subject.

REFERENCES:
patent: 2384578 (1945-09-01), Turner
patent: 3279311 (1966-10-01), Lichtner
patent: 3375752 (1968-04-01), Fairbanks et al.
patent: 3519346 (1970-07-01), Robbins
patent: 4059357 (1977-11-01), Klein
patent: 4260256 (1981-04-01), Smart

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