Photography – With object illumination for exposure – Having artificial illumination termination control
Patent
1999-03-25
2000-05-09
Perkey, W. B.
Photography
With object illumination for exposure
Having artificial illumination termination control
396205, G03B 1505
Patent
active
060615273
ABSTRACT:
A D/A converter performs a D/A conversion on digital light quantity indication data outputted from a CPU to generate an analog light quantity indication signal. The analog light quantity indication signal thus generated is supplied to both a power supply circuit and a light quantity control circuit comprising a photometric sensor, an integration circuit, and a comparison circuit. The light quantity control circuit outputs to a flash light emission circuit a light emission stop signal at the time point when the integrated quantity of light reaches a threshold according to the light quantity indication signal.
REFERENCES:
patent: 5956535 (1999-09-01), Tohyama
Akiba Makoto
Arai Hiroyuki
Saito Tatsuo
Takahashi Minoru
Costellia Jeffrey L.
Fuji Photo Optical Co., Ltd.
Perkey W. B.
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