Process and apparatus for automatic exposure time control in cop

Details Process and apparatus for automatic exposure time control in cop Process and apparatus for automatic exposure time control in cop

1976-01-07

1976-10-12

Peters, Jr., Joseph F.

Photocopying

Projection printing and copying cameras

Illumination systems or details

354 33, 354 51, 355 69, G03B 2772, G03B 2778

Patent

active

039854400

ABSTRACT:
This invention relates to a process for automatic exposure time control in the exposure of light-sensitive copying material; comprising, photoelectrically measuring the illumination in the plane of the copying material, comparing the voltage produced by the photoelectric measuring means with a reference voltage, which is inversely proportional to time, during exposure, and terminating exposure when a predetermined difference between the two voltages is reached. The invention also includes an apparatus for performing the process.

REFERENCES:
patent: 3344704 (1967-10-01), Simpson et al.
patent: 3397611 (1968-08-01), Davies
patent: 3426357 (1969-02-01), Panlus
patent: 3588247 (1971-06-01), Noda et al.
patent: 3672767 (1972-06-01), Pomlengi
patent: 3677151 (1972-07-01), Werner et al.
patent: 3683767 (1972-08-01), Sahara
patent: 3703130 (1972-11-01), Watanake
patent: 3736851 (1973-06-01), Ono et al.
patent: 3783759 (1974-01-01), Wagner et al.

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