Shutter time temperature compensating device in a camera

Details Shutter time temperature compensating device in a camera Shutter time temperature compensating device in a camera

1978-09-14

1980-07-01

Gellner, Michael L.

354 23D, 354 6DR, G03B 962

Patent

active

042103940

ABSTRACT:
An electrical circuit for compensating for variations in the shutter time of the shutter mechanism in a camera which are caused by temperature variations comprises a temperature detecting circuit which generates an output voltage corresponding to the ambient temperature variation, and a control circuit which generates a compensating voltage based upon the temperature measured by the temperature detecting circuit and the known shutter time temperature characteristic of the shutter mechanism in the camera. The compensating voltage is combined with a shutter time voltage corresponding to a desired shutter time, in such a manner that the resulting voltage, which is used to control the shutter, substantially eliminates shutter time variations caused by temperature variations, thereby rendering shutter time independent of temperature.

REFERENCES:
patent: 3863263 (1975-01-01), Itagaki
patent: 4000498 (1976-12-01), Tunekawa et al.

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