Radiation-sensitive control circuit for driving lamp at various

Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device

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315158, 355 69, G03B 2778, H05B 4138

Patent

active

RE0305715

ABSTRACT:
An exposure system is described employing a lamp and means for controlling the exposure time period during which light from the lamp at a preselected level is passed through a light path to an exposure plane. Light is detected in the light path and the brightness of the lamp is adjusted according to the sensed light to provide the preselected level of light output from the lamp during the exposure period. Also described is a method for operating such a system.

REFERENCES:
patent: 2298344 (1942-10-01), Burnham
patent: 3366835 (1968-01-01), Morris
patent: 3431427 (1969-03-01), Pahl
patent: 3456155 (1969-07-01), Buchanan
patent: 3483428 (1969-12-01), Plante
patent: 3681654 (1972-08-01), Quinn
patent: 3726197 (1973-04-01), Hasegawa et al.
patent: 4117375 (1978-09-01), Bachur et al.

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