Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1981-03-13
1983-09-13
La Roche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315159, 315241P, 354 62, 354145, H05B 4132
Patent
active
044044968
ABSTRACT:
A light source apparatus which comprises a flash discharge tube for illuminating a foreground subject, a switching element connected in series with the flash discharge tube, a light receiving circuit for photoelectrically converting light reflected by a foreground subject to produce a signal corresponding to the amount of light reflected from the received foreground subject and a decision circuit for producing an interruption signal for rendering the switching element non-conductive with partially as a function of the output signal of the light receiving circuit. A correction circuit for producing a correction signal in accordance with a preset film sensitivity is further provided. The decision circuit produces the interruption signal when the difference between the output signals of the correction circuit and light receiving circuit is reduced to zero.
REFERENCES:
patent: 3519879 (1970-07-01), Ogawa
patent: 3591829 (1971-07-01), Murata et al.
patent: 3875471 (1975-04-01), Buck
La Roche Eugene R.
Olympus Optical Co,. Ltd.
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