Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1980-03-27
1982-05-11
La Roche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315241P, H05B 4132
Patent
active
043296238
ABSTRACT:
An electronic flash apparatus comprises a flash lamp and a semiconductor switching element which are connected in series across a main capacitor, and a flash control circuit which measures light reflected from an object to be photographed illuminated by flash light produced by the flash lamp, and produces a control signal to render the semiconductor switching element nonconductive. The flash control circuit includes a photoelectric converting circuit for converting the reflected light into a voltage signal, an integrator for integrating the voltage signal, and a comparator for comparing the output voltage from the integrator with a reference voltage. To obtain a proper flash exposure a compensation signal generating circuit is provided which is responsive to the initiation of flashing of the flash lamp to produce a compensation signal having a desired waveshape. The compensation signal acts on the flash control circuit to control the generation timing of the control signal. The flash light produced by the flash lamp after the switching element has been rendered nonconductive is positively used for a proper exposure.
REFERENCES:
patent: 3200723 (1965-08-01), Topaz
patent: 3875471 (1975-04-01), Buck
patent: 3896337 (1975-07-01), Decker
patent: 4047187 (1977-09-01), Mashimo et al.
La Roche Eugene R.
Olympus Optical Co,. Ltd.
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