Patent ID: 8934792
Filing Date: 2015-01-13
Classification: G03G

Abstract:
1. A status detection device comprising: a heater for heating a toner image transferred onto a paper sheet; a first power line for connecting the heater to an AC power supply so that power is supplied to one end of the heater; a second power line for connecting the heater to the AC power supply so that power is supplied to the other end of the heater; a switch portion disposed in the first power line between the heater and the AC power supply so as to turn on and off power supply; an overheat protection portion disposed in the second power line between the heater and the AC power supply so as to disconnect the second power line when temperature exceeds a predetermined temperature; and a zero cross signal generation portion which outputs a zero cross signal on the basis of a voltage of the first power line between the switch portion and the heater and a voltage of the second power line between the overheat protection portion and the heater in accordance with a waveform of the AC power supply, and outputs zero cross signals having different output values in a case where the voltage of the first power line is higher than the voltage of the second power line and in a case where the voltage of the second power line is higher than the voltage of the first power line.