Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1989-04-03
1991-01-01
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315158, 315311, H05B 3702, H05B 3904
Patent
active
049821393
ABSTRACT:
The present invention is directed to an illumination source (10) for illuminating an object (11) with light (16) of substantially constant intensity. The illumination source includes an electric light bulb (12) which is supplied with voltage from an adjustable- voltage power supply (14). The voltage supplied by the power supply (14) varies in accordance with the intensity of the light (16) radiated from the bulb (12), as sensed by a photodiode (24). The photodiode (24) is separated from the bulb by a length of lightguide fiber (26) into which light from the bulb is coupled by a glass rod (28). The fiber (26) and the rod (28) allow the photodiode (24) to be supplied with light from the bulb (12), yet to be thermally insulated therefrom, so as to avoid thermal run-away of the diode.
REFERENCES:
patent: 3996494 (1976-12-01), Suga
patent: 4008390 (1977-02-01), Runge
patent: 4155005 (1979-05-01), Knowlton et al.
patent: 4254364 (1981-03-01), Flint et al.
Fostec, Inc., Preliminary Product Bulletins, Nos. 501, The Light Sources, and 509, The Lightsource Mounting Brackets and Replacement Lamps (02/15/89).
Amir Israel
Armington Richard S.
Weissman Barry
AT&T Bell Laboratories
LaRoche Eugene R.
Levy Robert B.
Neyzari Ali
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