Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...
Patent
1980-08-19
1982-11-23
Wintercorn, Richard A.
Photocopying
Contact printing
Fluid pressure retention of carrier and receiver in exposure...
355132, G03B 2720, G03B 2702
Patent
active
043602665
ABSTRACT:
For contact-printing an original such as a photographic negative on a light-sensitive material a vacuum printing frame is provided which comprises a first vacuum chamber between a light-transmitting plate and an elastic diaphragm, and a second vacuum chamber opposed to the first vacuum chamber across the diaphragm. The two vacuum chambers are evacuated simultaneously, with the original and sensitive material mounted in superposition in the first vacuum chamber. Upon subsequent introduction of atmospheric pressure into the second vacuum chamber the original and the sensitive material make close, uniform contact with each other, thereby making themselves ready for exposure. Another embodiment employs a third vacuum chamber disposed opposite to the first vacuum chamber across the light-transmitting plate. Evacuated simultaneously with the first and second vacuum chambers, the third vacuum chamber makes possible the use of a thinner light-transmitting plate, which normally is of glass. The invention is also disclosed as adapted for continuous printing operation.
REFERENCES:
patent: 3995955 (1976-12-01), Topfer
patent: 4007987 (1977-02-01), Sheets
patent: 4054383 (1977-10-01), Lin et al.
patent: 4089603 (1978-05-01), Jacobs
Dai Nippon Insatsu Kabushiki Kaisha
Wintercorn Richard A.
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