Photocopying – Contact printing – Light boxes
Patent
1984-08-21
1986-03-11
Wintercorn, Richard A.
Photocopying
Contact printing
Light boxes
355120, G03B 2772, G03B 2704
Patent
active
045752362
ABSTRACT:
A latent contact photographic copy of an original image is formed by apparatus comprising a translucent platen for supporting on one side thereof an assembly including an original image to be copied and an unexposed photographic film overlying the original image. Parallel connected lamps mounted on the opposite side of the platen are provided for irradiating the photographic film through the platen and original image. A cover is movable between an open position in which it uncovers the platen for receiving the assembly and a closed position in which it covers the platen and assembly. A circuit connected to the lamps includes a switch for selectively enabling the circuit to activate the lamps. The switch is mounted for contact with the cover when the cover is in the closed position. The switch is thus closed to effect exposure of the photographic film in response to pressure exerted on the cover when the cover is in the closed position. An LED flashes once per second during the exposure to facilitate timing the exposure.
REFERENCES:
patent: 1824622 (1931-09-01), Reedy
patent: 4502781 (1985-03-01), Nguyen
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