Power control of electronic apparatus in response to surrounding brightness
First Claim
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1. Power control means in an electrophotographic copying machine, said power control means comprising:
- photodetector means, responsive to the intensity of ambient light impingent thereon, for supplying a control voltage to said power control means;
means for supplying power to said copying machine;
copy enabling means, responsive to said means for supplying power, for placing said copying machine in a ready mode;
means for providing a reference voltage representative of a specific intensity of ambient light impinging on said photodetector means;
comparator means for comparing said control voltage and said reference voltage and for providing an output signal representative thereof;
means for delaying said output signal of said comparator means;
first gate means, responsive to the output signal of said comparator means and said copy enabling means, for providing a first output signal;
second gate means, responsive to the first output signal of said first gate means and said means for supplying power to said copying machine, for providing a second output signal; and
relay means, responsive to said second output signal representative of said intensity of ambient light impinging on said photodetector, for automatically turning said copying machine ON or OFF.
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Abstract
A power controller for an electronic apparatus including an electrophotographic copying machine is provided for automatically prohibiting power supply to parts of the apparatus in response to the reduction of a light-shining amount, e.g., a decrease in the light surrounding the apparatus. The power controller includes a photosensitive element, a comparator, a delay circuit, a gate, and a relay. The photosensitive element serves to provide a voltage in accordance with the surrounding brightness.
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Citations
5 Claims
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1. Power control means in an electrophotographic copying machine, said power control means comprising:
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photodetector means, responsive to the intensity of ambient light impingent thereon, for supplying a control voltage to said power control means; means for supplying power to said copying machine; copy enabling means, responsive to said means for supplying power, for placing said copying machine in a ready mode; means for providing a reference voltage representative of a specific intensity of ambient light impinging on said photodetector means; comparator means for comparing said control voltage and said reference voltage and for providing an output signal representative thereof; means for delaying said output signal of said comparator means; first gate means, responsive to the output signal of said comparator means and said copy enabling means, for providing a first output signal; second gate means, responsive to the first output signal of said first gate means and said means for supplying power to said copying machine, for providing a second output signal; and relay means, responsive to said second output signal representative of said intensity of ambient light impinging on said photodetector, for automatically turning said copying machine ON or OFF. - View Dependent Claims (2, 3, 4, 5)
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Specification