Strobo control circuit

Details Strobo control circuit Strobo control circuit

1986-07-21

1987-08-04

Perkey, W. B.

354137, G03B 1505, G03B 716

Patent

active

046842349

ABSTRACT:
A strobo control circuit includes shutter blades having the function of the diaphragm and which are opened so that an opening area thereof is substantially proportional to the square of exposure time. A distance to a subject to be photographed is detected by, for exmaple, a distance measuring circuit or a focus adjusting mechanism and a basic pulse having a period which is substantially proportional to the distance is generated. The basic pulse is supplied to a counter in interlocked relationship with the opening operation of the shutter blades so that the counter is operated. A coded film speed is inputted and when a count of the counter reaches a value determined in accordance with the coded film speed, a strobo unit is lighted so that an F number upon the flashlight illumination of the strobo unit corresponds to the film speed and the distance.

REFERENCES:
patent: 3832723 (1974-08-01), Nickel
patent: 4065776 (1977-12-01), Iwata et al.
patent: 4192587 (1980-03-01), LaRocque et al.
patent: 4603954 (1986-08-01), Egawa et al.

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