Image heating apparatus using induction heating method
AssigneeCanon Kabushiki Kaisha
InventorsAtsuyoshi Abe, Toshiaki Miyashiro
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Abstract
An image heating apparatus for heating an image formed on a recording material, including a rotation member; an excitation coil for generating a magnetic field to induce an eddy current in the rotation member; a temperature detecting element for detecting a temperature of the rotation member; and a controller for controlling an electrical supply to the excitation coil so that the temperature detected by the temperature detecting element is maintained at a set temperature, wherein while the set temperature is set a stand-by temperature, the controller controls the electrical supply to the excitation coil and the rotation member is maintained in a stoppage of rotation.
Claims20
An image heating apparatus for heating an image formed on a recording material, comprising:
- a heating member;
- magnetic field generating means for generating a magnetic field to induce an eddy current in said heating member;
- a temperature detecting element for detecting a temperature of said heating member;
- and
- control means for controlling an electrical supply to said magnetic field generating means so that the temperature detected by said temperature detecting element is maintained at a set temperature,
- wherein said control means sets the set temperature in accordance with a temperature of said magnetic field generating means.
An image heating apparatus for heating an image formed on a recording material, comprising:
- a heating member:
- magnetic field generating means for generating a magnetic field to induce an eddy current in said heating member;
- a temperature detecting element for detecting a temperature of said heating member;
- and
- control means for controlling an electrical supply to said magnetic field generating means so that the temperature detected by said temperature detecting element is maintained at a set temperature,
- wherein said control means sets the set temperature to a first set temperature when a temperature of said magnetic field generating means is a first temperature, and sets the set temperature to a second set temperature lower than the first set temperature when the temperature of said magnetic field generating means is a second temperature higher than the first temperature.
An image heating apparatus for heating an image formed on a recording material, comprising:
- a heating member;
- magnetic field generating means for generating a magnetic field to induce an eddy current in said heating member;
- a temperature detecting element for detecting a temperature of said heating member;
- and
- control means for controlling an electrical supply to said magnetic field generating means so that the temperature detected by said temperature detecting element is maintained at a target temperature,
- wherein said control means variably sets the target temperature lest a temperature of said magnetic field generating means excessively increases when said apparatus is at least in a predetermined state.
An image forming apparatus comprising:
- an image forming unit which is configured to form an image on a recording material;
- a fixing unit which is configured to heat and fix the formed image on the recording material;
- and
- a control unit which is configured to control said image forming unit and said fixing unit,
- wherein said fixing unit comprises a heating member, a magnetic field generating unit for generating a magnetic field to induce an eddy current in said heating member, and a temperature detecting element for detecting a temperature of said heating member,
- wherein said control unit controls an electrical supply to said magnetic field generating unit so that the temperature detected by said temperature detecting element is maintained at a target temperature, and said control unit variably sets the target temperature lest a temperature of said magnetic field generating unit excessively increases when said apparatus is at least in a predetermined state.
Dependencies are inferred from the claim text.