Electronic flash apparatus controlled by a digital memory system

Details Electronic flash apparatus controlled by a digital memory system Electronic flash apparatus controlled by a digital memory system

1975-08-28

1977-07-12

Adams, Russell E.

354 23D, 354 27, 354 60A, 354 60F, 354128, 354139, 354149, G03B 716

Patent

active

040358143

ABSTRACT:
An electronic flash apparatus to be used for photographing purposes and controlled by a digital memory system. A flash structure provides flash illumination while an oscillator circuit produces pulses the frequency of which is determined according to a factor such as the light intensity or the distance of the object from the flash apparatus, and these pulses are counted by a memory device which is set to terminate the counting of the pulses according to one or more parameters such as the film speed, the diaphragm aperture, or the like. The flash illumination is terminated by a flash control structure actuated either according to the number of pulses counted or according to the time interval required to count a given number of pulses.

REFERENCES:
patent: 3348462 (1967-10-01), Fahlenberg
patent: 3709123 (1973-01-01), Tokutomi
patent: 3748979 (1973-07-01), Wada
patent: 3832723 (1974-08-01), Nickel
patent: 3875471 (1975-04-01), Buck

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