Zone responsive, light-sensing circuit for controlling flash pho

Details Zone responsive, light-sensing circuit for controlling flash pho Zone responsive, light-sensing circuit for controlling flash pho

1977-12-21

1979-07-24

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

250214P, 315155, 315241P, 354 31, 354 33, H05B 4132

Patent

active

041624262

ABSTRACT:
The present invention relates to a light-sensing circuit used in a so-called light regulating type flash device to automatically control the amount of flash emitted. In the present invention, a flash photographing with an appropriate exposure is done, securing such flash amount as providing appropriate exposure always regardless of the position of an object in a photographing frame. This is done by making light-sensing for each of different zones independently using a plural number of light-sensing circuits for stopping the flashing by the output of the one light-sensing circuit reaching a prescribed level of output from the different light-sensing circuits.

REFERENCES:
patent: 3545350 (1970-12-01), Gross
patent: 3563143 (1971-02-01), Peterson
patent: 3568582 (1971-03-01), Uchida et al.
patent: 3714442 (1973-01-01), Frank
patent: 3749921 (1973-07-01), Vital et al.
patent: 3836920 (1974-09-01), Uchiyama et al.

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