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Fixing device, image forming apparatus having the same and image forming method

  • US 20070201913A1
  • Filed: 02/13/2007
  • Published: 08/30/2007
  • Est. Priority Date: 02/27/2006
  • Status: Active Grant
First Claim
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1. A fixing device, comprising:

  • a fixing member having an outer peripheral face with which a sheet to be transported is brought into pressure contact;

    an exciting coil placed along the outer peripheral face of the fixing member to form an elongated shape with respect to a width direction of the sheet to be transported for induction heating of a heat generating layer of the fixing member;

    an RF power supply circuit for applying a voltage of a certain drive frequency to the exciting coil so as to make the heat generating layer of the fixing member generate heat through the exciting coil;

    a degaussing coil placed in a small size sheet non-passing region corresponding to a part of the outer peripheral face of the fixing member with respect to the width direction of the sheet along the exciting coil;

    a changeover switch for opening or closing the degaussing coil in accordance with a size of the sheet to be transported; and

    a control section for changing and setting a drive frequency of the RF power supply circuit along with opening or closing of the degaussing coil.

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