Image fixing apparatus with overshoot prevention means
AssigneeCanon Kabushiki Kaisha
InventorsShokyo Koh, Yoshihiko Suzuki
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Abstract
An image fixing apparatus includes a heater; a film movable together with a recording material having a visualized image which is heated by the heater through the film; a temperature detecting element for detecting a temperature of the heater; control system for controlling power supply to the heater so as to provide a constant output of the temperature detecting element during fixing operation; wherein the control system controls the power supply to the heater in accordance with an output of the temperature detecting element from start of power supply to the heater to the temperature of the heater reaching a predetermined temperature.
Claims11
An image fixing apparatus, comprising:
- a heater,
- a film movable together with a recording material having a visualized image to transfer heat from said heater to the visualized image,
- a temperature detecting element for detecting a temperature of said heater, and
- control means for controlling electric power supply to said heater in accordance with a temperature detected by said temperature detecting element to maintain a fixing temperature of said heater during a fixing operation;
- wherein after a start of power supply to said heater, said control means reduces the electric power with an increase of the temperature detected by said temperature detecting element, and after the detected temperature reaches the fixing temperature, said control means further reduces electric power to said heater to decrease the temperature of said heater.
Dependencies are inferred from the claim text.