TTL automatic flash control device

Details TTL automatic flash control device TTL automatic flash control device

1991-11-25

1992-12-01

Perkey, W. B.

354416, G03B 1505

Patent

active

051683008

ABSTRACT:
A TTL automatic flash control device for a flash light source for a camera is disclosed. The device has a flash control unit for controlling flashing of the flash light source. In sequential flashing photographic operation mode in which a plurality of flashing photographic operations are conducted sequentially, the flash control unit preliminarily flashes the flash light source at least once before the series of flashing photographic operations are initiated. Thereafter, the flash control unit performs main flashing of the flash light source for each shot. The device further includes a weighting value operating unit for detecting distribution of reflected light regarding a plurality of photometric areas obtained by dividing a field during the preliminary flashing and for calculating a weighting value for each of the photometric areas on the basis of the distribution of the reflected light, and a quantity of light control unit for metering each of the photometric areas on the basis of the weighting value thereof during the main flashing and for controlling a quantity of light emitted from the flash light source.

REFERENCES:
patent: 5006879 (1991-04-01), Takagi
patent: 5130737 (1992-07-01), Azuma et al.

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