Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1984-05-25
1985-12-17
Hix, L. T.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 83, G03B 2778
Patent
active
045589453
ABSTRACT:
A reproduction camera for the production of contact screen prints from an original is provided with sensing means, such as a photoelectric cell, for obtaining a measure of the light reflected by the original under conditions of an imagewise main exposure through the contact screen and a signal representing the obtained measure is inputted to a computerized control system through which, by taking into account the effect of stray light caused by reflection from the original during the main exposure, a non-imagewise additional exposure through the contact screen is effected so as to reproduce the minimum and maximum optical densities of the original with the correct dot sizes.
REFERENCES:
patent: 3611159 (1971-10-01), Florsheim, Jr. et al.
patent: 3619055 (1971-11-01), Archer
patent: 3712730 (1973-01-01), Florsheim, Jr. et al.
patent: 3796491 (1974-03-01), McIntosh et al.
patent: 4408873 (1983-12-01), Labrum
patent: 4419008 (1983-12-01), Nishimoto
Search Report issued Feb. 29, 1984, in the Netherlands Appln.
Basic Photography, by Michael J. Langford, p. 243, The Focal Press Limited, London and New York, 1965.
Helioprint AS
Hix L. T,.
Johnston Albert C.
Rutledge Della
Speranza William J.
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