Patent ID: 7991316
Filing Date: 2011-08-02
Classification: G03G

Abstract:
1. An fixing device, comprising: a heating body which has a heating heat generation section subjected to induction heating upon application of alternating magnetic fields generated by an exciting coil and which comes into contact with a printing surface side of recording paper with a toner image transferred thereto; a pressing body which has a pressing heat generation section and which comes into contact with a back surface of the recording paper, the pressing heat generation section being higher in magnetic permeability than the heating heat generation section and being subjected to induction heating by a part of magnetic flux in the alternating magnetic fields leaking from the heating heat generation section; and a drive circuit for applying drive voltage to the exciting coil, wherein a rate of the alternating magnetic fields leaking from the heating heat generation section is changed by frequencies of the drive voltage; and wherein the drive circuit inputs a high-frequency voltage with a specified frequency, which lowers a leakage rate of generated alternating magnetic fields from the heating heat generation section, and a low-frequency voltage a specified frequency, which increases a leakage rate of the generated alternating magnetic fields from the heating heat generation section, into the exciting coil.