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IMAGE FORMING APPARATUS

  • US 20140126922A1
  • Filed: 05/15/2013
  • Published: 05/08/2014
  • Est. Priority Date: 11/02/2012
  • Status: Active Grant
First Claim
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1. An image forming apparatus comprising:

  • a heating element that generates heat when a current is applied thereto;

    a temperature detector that is disposed in the vicinity of the heating element and detects a temperature of the heating element;

    a resistor that divides a detection result of the temperature detector and a predetermined reference voltage;

    a disconnection detector that is connected in parallel to the resistor, and detects a disconnection of the temperature detector;

    a converter that converts the divided voltage value into a digital signal and outputs the digital signal to a controller;

    a comparing unit that inverts an output thereof on the basis of a predetermined threshold;

    a delay circuit that delays an increase in an output voltage of the comparing unit;

    a discharge circuit that quickly discharges the output voltage of the comparing unit;

    a latch circuit that includes a flip-flop connected to an output of the discharge circuit; and

    a power supply path connecting and disconnecting unit that is connected to the latch circuit, and connects and disconnects a power supply path to the heating element.

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