CONTACT POINT INPUT DEVICE

PROBLEM TO BE SOLVED: To provide a contact point input device of extremely little power consumption by substantially shortening energizing time to the light emitting diode of a photocoupler. SOLUTION: This device is provided with a photocoupler 3 composed of a light emitting diode 4 and a phototransistor 5, the input circuit of the light emitting diode 4 composed of the serial circuit of a power source 11 and a contact point 14, a control circuit 6 for detecting the output of the phototransistor 5 at each fixed sapling cycle and controlling the equipment and a switching transistor 18 for energizing control whose collector and emitter are serially connected to the input circuit and base receives the signals of the control circuit 6. The control circuit 6 applies the signals to the base of the switching transistor 18 only in the required period of the output detection of the phototransistor 5.