Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-08-30
1993-04-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, G01V 904
Patent
active
052006085
ABSTRACT:
An LED and a photo-diode are arranged such that they are optically coupled with each other. The first terminal to which a power supply voltage is applied is connected to the anode of the LED. Between the cathode of the LED and the second terminal for outputting an output signal, there is provided a constant current circuit for allowing a constant current to flow into the LED. To the cathode of the LED, connected is the collector of an NPN transistor, to the emitted of which the second terminal is connected. Light emitted from the LED is detected and converted into an current signal by the photo-diode. The current signal generated by the photo-diode is amplified by an amplifying circuit. A signal output from this amplifying circuit is supplied to the base of the NPN transistor, thereby controlling ON/OFF operation of the transistor. Between the second terminal and the ground point located outside the device, connected is a load resistor.
REFERENCES:
patent: 4270046 (1981-05-01), Werking
patent: 4730108 (1988-03-01), Rodal et al.
patent: 4761603 (1988-08-01), Nodera
patent: 5077467 (1991-12-01), Barron, Jr. et al.
Kabushiki Kaisha Toshiba
Le Que T.
Nelms David C.
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