Time determination circuit for camera

Details Time determination circuit for camera Time determination circuit for camera

1981-03-04

1982-09-21

Hix, L. T.

354 51, G03B 726

Patent

active

043504264

ABSTRACT:
A time determination circuit for an automatic or manual exposure camera in which a single capacitor is utilized for both a power maintaining time determination circuit and a shutter controlling time determination circuit to thereby significantly reduce the space required for the electronics in the camera and thereby reducing the cost. The single capacitor is charged either through a constant current source controlled by an electromagnet switch which is in turn operated in response to raising of the camera mirror or through a transistor operated in response to a shutter time calculation circuit. A terminal voltage of the capacitor is compared with a fixed voltage and the comparison output is amplified to control an electromagnet.

REFERENCES:
patent: 3810228 (1974-05-01), Taguchi et al.

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