Light-responsive electric switch

Details Light-responsive electric switch Light-responsive electric switch

1975-02-03

1976-06-01

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214AL, 250239, 307117, 315159, 317130R, H01J 3912, H05B 3702, H01H 4724

Patent

active

039611833

ABSTRACT:
A light-responsive electric switch is composed on the one hand by an electronic circuit constituted, in the case of direct-current supply, by a voltage divider comprising a fixed resistor and a variable resistor forming the photo-conductive cell, by four transistors which are blocked or rendered conductive according to the illumination of the photo-conductive cell, by a change-over switch transmitting the voltage to another transistor into the collector circuit of which a motor is connected, and on the other hand by an electro-mechanical device constituted by a bistable trigger circuit controlling the motor, by a step-down gearing meshing with a pinion fixed on the shaft of this motor, by cams fast with the shaft of the final pinion of the step-down gearing and by one or more contacts which close or interrupt one or more lighting circuits.

REFERENCES:
patent: 3207932 (1965-09-01), Tongret
patent: 3496422 (1970-02-01), Horowitz
patent: 3629649 (1971-12-01), Del Zotto

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