Photography – With object illumination for exposure – Having preexposure illumination
Patent
1999-03-29
2000-06-13
Perkey, W. B.
Photography
With object illumination for exposure
Having preexposure illumination
396159, 396182, G03B 1505
Patent
active
06075947&
ABSTRACT:
A camera system includes a plurality of flash devices for performing flash light emission toward an object during an exposure, a preliminary light emission control circuit for causing the plurality of flash devices to sequentially make preliminary light emission toward the object prior to the flash light emission to be performed by the plurality of flash devices during the exposure, a compression-type light measuring sensor for compressing a photoelectric current obtained by converting light from the object and for outputting the compressed photoelectric current as a voltage, and a light emission amount control circuit for controlling amounts of light emission of the plurality of flash devices during the exposure on the basis of light measurement outputs during the preliminary light emission obtained by the compression-type light measuring sensor by measuring reflected light from the object caused by the preliminary light emission control circuit.
REFERENCES:
patent: Re35877 (1998-08-01), Takagi
patent: 4457602 (1984-07-01), Mizokami
Canon Kabushiki Kaisha
Perkey W. B.
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