FUSER PROTECTION DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME

摘要

A fuser protection device realizing a protection circuit to protect a fuser by forcibly turning off a heater lamp when the heater lamp is overheated using a sensing signal from a non-contact thermistor to sense surface temperature of a heating roller and an image forming apparatus having the same. The fuser protection device includes a temperature sensing unit to sense a temperature of the heating roller in a non-contact fashion using two sensors provided at different positions, a differential amplifier to amplify a voltage difference between two sensor outputs from the temperature sensing unit, and a comparator to compare an output voltage from the differential amplifier with a reference voltage, wherein power supply to the heater lamp is blocked according to an output signal from the comparator.