Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1975-09-30
1978-07-18
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
250205, 315158, 315307, 323 21, H05B 3904
Patent
active
041018087
ABSTRACT:
The disclosure relates to a lamp control circuit for maintaining the light output intensity of an incandescent lamp or banks of lamps constant. The lamp control circuit comprises a pair of input terminals adapted for connection to an illumination power source having one of the input terminals coupled to one side of the incandescent lamp to be controlled, and switching means coupled to the other side of the controlled lamp and to the other input terminal so that when the switching means is closed the illuminating power from the power source is applied to the controlled lamp and when the switch is open the illuminating power to the controlled lamp is terminated. The lamp control circuit additionally includes an illumination power sampling means which includes a second incandescent lamp which is coupled between the one input terminal and the switching means for sampling the illumination power and converting the sampled illumination power to light energy having an intensity related to the amount of the illuminating power received by the controlled lamp. A light sensitive detector is associated with the second incandescent lamp and is coupled to the switching means for controlling the switching means closed and open time durations responsive to the second incandescent lamp light intensity to render the light output intensity of the controlled lamp substantially constant.
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Phototransistor Regulates Illumination Intensity, Electronics, Oct. 4, 1965, p. 101.
Control and Regulation System for Photocell Sensing Device, IBM Technical Disclosure Bulletin, vol. 7, No. 9, Feb. 1965.
Bell & Howell Company
LaRoche Eugene R.
Samlan Alan B.
Thibault Harry G.
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