Pulse modulated automatic light control utilizing gated image intensifier
First Claim
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1. Light control apparatus for a television camera comprising:
- image intensifier means for amplifying light from a scene incident to said camera;
means for providing a brightness signal in accordance with brightness levels of said light from said scene;
pulse modulator means responsive to said brightness signal for generating pulses having durations in accordance with said brightness signal;
gating means responsive to said pulses for providing first and second gating pulses, said first gating pulses having pulse durations in accordance with said durations of said pulses, said second gating pulses provided at expirations of said durations of said first gating pulses; and
control means responsive to said first and second gating pulses for providing on and off voltages to respectively turn said image intensifier means on and off.
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Abstract
Automatic light control apparatus for a television camera system utilizing a gated image intensifier wherein a pair of laser diodes illuminate, respectively, a pair of avalanche photodiodes to apply switching voltages to the image intensifier. Low-level gating signals are utilized to activate the laser diodes. The laser diodes are gated on and off in complementary fashion whereby the image intensifier is turned on for pulse intervals inversely proportional to the brightness of the scene being televised.
15 Citations
3 Claims
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1. Light control apparatus for a television camera comprising:
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image intensifier means for amplifying light from a scene incident to said camera; means for providing a brightness signal in accordance with brightness levels of said light from said scene; pulse modulator means responsive to said brightness signal for generating pulses having durations in accordance with said brightness signal; gating means responsive to said pulses for providing first and second gating pulses, said first gating pulses having pulse durations in accordance with said durations of said pulses, said second gating pulses provided at expirations of said durations of said first gating pulses; and control means responsive to said first and second gating pulses for providing on and off voltages to respectively turn said image intensifier means on and off. - View Dependent Claims (2, 3)
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Specification