Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1983-05-18
1984-12-18
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 71, G03B 2772
Patent
active
044888058
ABSTRACT:
A reproduction camera employed for the production of contact screen prints from an original is provided with a control system including a computer means which, after feeding in data representing the minimum and maximum optical densities of the original, the optical data of the screen used and the required data of the camera and the light sensitive material such as film, determines and applies a dosage for the main exposure and one or more additional exposures to yield a screened print of which the highlight dots and the shadow dots have specific sizes correspondingly substantially completely to the minimum and maximum optical densities of the original. The computer means includes an adjustable basic screen range regulator for varying the main exposure at the time of the adaption of at least one of the additional exposures in order to continue to reproduce substantially completely the minimum and maximum optical densities of the original with the specific dot sizes.
REFERENCES:
patent: 3611159 (1971-10-01), Florsheim, Jr. et al.
patent: 3619055 (1971-11-01), Archer et al.
patent: 3712730 (1973-01-01), Florsheim, Jr. et al.
patent: 3796491 (1974-03-01), McIntosh et al.
patent: 4021115 (1977-05-01), Jeppesen
Johnston Albert C.
Oce-Helioprint AS
Wintercorn Richard A.
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