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Induction-heating-apparatus-for-heating-image-on-recording-material

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Induction heating apparatus for heating image on recording material

Details

Inventors: Ohta, Tomoichiro;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Leung; Philip H.
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

The present invention relates to an induction heating apparatus for heating an image on a recording material which has an electric conductor, a first coil, for inducing an eddy current in the electric conductor disposed over a longitudinal direction of the electric conductor, a second coil disposed so as to overlap an end portion of the first coil, a first power supply for supplying an alternating current to the first coil, a second power supply for supplying an alternating current to the second coil, a phase shifting circuit for controlling a phase of the alternating current supplied to the second coil, and control means for controlling the phase shifting circuit in conformity with a temperature of the electric conductor.

DETAILED DESCRIPTION The present invention has been made in view of the above-noted problem, and an object thereof is to provide an induction heating apparatus which can uniformize the temperature of the whole of a heat generating portion.
Another object of the present invention is to provide an induction heating apparatus which can suppress the excessive temperature rise of the opposite portions of a heat generating portion.
Still another object of the present invention is to provide an induction heating apparatus comprising: an electric conductor; a first coil for inducing an eddy current in the electric conductor, the first coil being disposed over the longitudinal direction of the electric conductor; a second coil disposed so as to overlap the end portion of the first coil; a first power supply for supplying an alternating current to the first coil; a second power supply for supplying an alternating current to the second coil; a phase shifting circuit for controlling the phase of the alternating current supplied to the second coil; and control means for controlling the phase shifting circuit in conformity with the temperature of the electric conductor.
Further objects of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

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