Dual-function variable resistor in automatic/manual camera shutt

Details Dual-function variable resistor in automatic/manual camera shutt Dual-function variable resistor in automatic/manual camera shutt

1976-11-09

1978-06-27

Hix, L. T.

354 51, 354 60L, G03B 708, G03B 700

Patent

active

040978770

ABSTRACT:
A shutter control circuit for a single lens reflex camera includes a capacitor 8 for storing a voltage proportional to the measured object brightness value through a first switch 7, a second switch 14 for selecting the automatic or manual mode, and a variable resistor 12 having two sliding contact terminals A and B coupled to a third switch 11 controlled by the position of the reflex mirror 26. In the automatic mode one of the sliding contact terminals B is set to the difference between the f-stop and film sensitivity values, which influences the capacitor charge, which in turn controls the exposure time through a first position of the selecting switch. In the manual mode the other sliding contact terminal A directly controls the exposure time through a second position of the selecting switch.

REFERENCES:
patent: 3968502 (1976-07-01), Shiozawa

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