Video camera with automatically variable diaphragm and shutter speed control
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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Abstract
A compact video camera which is operable at variable shutter speeds to capture high speed events which may be recorded and played back in slow motion for scene analysis. The video camera includes an image sensor, a variable diaphragm and a variable speed shutter. The variable diaphragm and variable speed shutter are controlled automatically to maintain constant the peak to peak signal level of the video signal produced by the image sensor so that the highest shutter speed is always maintained as scene brightness changes.
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Citations
2 Claims
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1. A video camera with automatically variable diaphragm and shutter speed control, comprising:
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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. - View Dependent Claims (2)
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Specification