Abstract: The disclosure is of a light-responsive electric switch which is characterized in that it is constituted mainly by a photoresistive cell inserted in a voltage-divider bridge of which the voltage variations, as functions of the illumination, control a standard integrated circuit comprising four NAND gates which, through the intermediary of a transistor, actuate a triac controlling the illumination circuit.

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.