Auto-flash photographing system

Details Auto-flash photographing system Auto-flash photographing system

1988-08-19

1990-01-30

Perkey, W. B.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

354132, 315241P, G03B 1505, H05B 4114

Patent

active

048976849

ABSTRACT:
An auto-flash photographing system includes a flash lamp unit, a photometry unit for detecting light reflecting from a subject of interest, a reference setting unit, a comparator, and a trigger unit. The flash lamp is once triggered to emit a flash, and the light detected by the photometry unit is compared with a reference value defined by the reference setting unit by the comparator. If the detected light is lower than the reference value, it indicates underexposure so that the trigger unit once again triggers the flash lamp. In this manner, the flash lamp is fired more than once while a shutter is set in a fully open condition until an optimal exposure condition is attained. In another structure, a plurality of flash lamps are provided they may be fired at the same time and extinguished separately or they may be fired one after another in sequence until a desired exposure condition for phototaking is obtained.

REFERENCES:
patent: 4174896 (1979-11-01), Mizokami et al.
patent: 4242616 (1980-12-01), Takematsu
patent: 4375322 (1983-03-01), Coppa et al.
patent: 4398127 (1983-08-01), Bahn et al.
patent: 4415247 (1983-11-01), Takematsu
patent: 4457602 (1984-07-01), Mizokami
patent: 4561751 (1985-12-01), Hagyuda
patent: 4643551 (1987-02-01), Ohmori
patent: 4673845 (1987-06-01), Yamada et al.

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