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Heater controlling apparatus and a fixing apparatus of an electrophotographic apparatus in use therewith

  • US 5,669,038 A
  • Filed: 04/19/1996
  • Issued: 09/16/1997
  • Est. Priority Date: 04/27/1995
  • Status: Expired due to Fees
First Claim
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1. A fixing apparatus for an image forming apparatus, said fixing apparatus comprising:

  • a heater, adapted in said fixing apparatus, for heating a fixing member;

    a zero-cross detector for detecting zero-cross timings of electric power when a voltage of said electric power is at zero volts;

    a switching device for turning on and turning off supply of said electric power to said heater;

    a controller for controlling said switching device so as to provide a first state in which said electric power is continuously supplied to said heater for a multiple of half-cycles from one of said zero-cross timings, and a second state in which said electric power is prevented to be supplied to said heater for a multiple of half-cycles from another of said zero-cross timings;

    wherein said electric power is supplied to said heater with an intermittent pattern, including said second state, for a predetermined period after at least one of a turn-on operation of said heater and a turn-off operation of said heater.

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