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Video camera with automatically variable diaphragm and shutter speed control

  • US 4,695,888 A
  • Filed: 11/13/1986
  • Issued: 09/22/1987
  • Est. Priority Date: 11/13/1986
  • Status: Expired due to Term
First Claim
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1. A video camera with automatically variable diaphragm and shutter speed control, comprising:

  • image sensor means for converting the image of a scene into a video signal having a predetermined image repetition rate;

    variable diaphragm means for controlling the light intensity of said image on said sensor;

    variable shutter means for controlling the interval within an image repetition interval during which said sensor is exposed to said image; and

    control means for controlling the peak to peak level of said video signal at a constant level in response to changing light intensity of said image by first, setting said variable shutter means to the shortest exposure interval while controlling said variable diaphragm means in response to varying light intensity and, second, when said variable diaphragm means is opened to its maximum opening, by controlling said variable shutter means to increase the exposure interval while maintaining said diaphragm means at said maximum opening.

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