Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1982-08-30
1984-04-10
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
250214L, 354416, 354428, 356223, H05B 4132
Patent
active
044423810
ABSTRACT:
An auto strobe control circuit comprising a flash stopping signal generating circuit for measuring the luminance of an object exposed to light emitted from a flash tube by a photometric circuit, sending the obtained photometric value, film sensitivity information and aperture information to an operational amplifier to subject them to an arithmetic operation, and generating a flash stopping signal when the value calculated by the arithmetic operation, reaches a predetermined light amount. The photometric circuit essentially consists of a photoelectromotive force type light receiving element and a log-conversion diode connected in series with a constant-voltage circuit, and a temperature compensation circuit connected with the log-conversion diode. The photometric value is sent from a connection point between the light receiving element and the log-conversion diode to the operational amplifier. A voltage follower is positioned between the temperature compensation circuit and the log-conversion diode.
REFERENCES:
patent: 3879740 (1975-04-01), Mori et al.
patent: 4100407 (1978-07-01), Takahashi
Fuji Photo Optical Co., Ltd.
LaRoche Eugene R.
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