ELECTRIC HEATING DEVICE

PURPOSE:To automatically change a spot to be irradiated by a reflector disc in cope with the presence of a human body by controlling a revolving reflector disc, on the basis of a signal being output from a human-body sensor which is designed to be revolved and the reciprocated. CONSTITUTION:A pyroelectric sensor 5, which detects thermal rays emitted from a human body and which sends a signal, is connected to the input terminal of an amplifier circuit 25. The output terminal of an amplifier circuit 25 is connected to the terminals P15 and P16 of a microcomputer 20 via an inverter circuit 24. When a power source switch 17 is turned ON, an electric heater 3 is energized, a signal is output from the terminal P11 of a microcomputer 20, and a photo-thyristor 23A is turned ON to complete a closed circuit between electric source lines L1 and L2, and then a synchronized motor 7 is turned to the clockwise direction. When the motor 7 is rotated, a rotary reflector disc 4, the pyroelectric sensor 5 and a disc 10 are revolved all together to the clockwise direction, since they are connected to each other by the intermediary of a synchronized motor 7 and a revolving shaft 6.