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Shutter control apparatus for a camera

Image Number 3 for United States Patent #4769667.

A camera shutter control apparatus comprises a detector for detecting the actual amount of opening of a camera shutter, comprised by a light emitter, a light detector, and a light controller for varying the amount of light passing therethrough from the light emitter to the light detector according to the detected amount of opening of the shutter. A controller controls the light emitter to emit a predetermined constant amount of light based on an output from the light detector. An operating device actuates the shutter in such a way to make the output of the light detector coincide with a signal representative of a predetermined shutter opening characteristic. The shutter is controlled to open and close following the predetermined characteristic defined by a shutter opening-closing program which is changeable according to the focal length of the camera lens.

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