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US 5,627,634 AGranted
Image fixing apparatus having a heater energized and controlled by electric energy
AssigneeCanon Kabushiki Kaisha
InventorShokyo Koh
Life of this patent
Estimating the term…
Abstract
An image fixing apparatus includes a heater having heat generating resistors producing heat by being supplied with electrical energy; a film movable together with a recording material, wherein a toner image on the recording material is heated by heat generated by the heat generating resistors through the film; an energizing device for energizing the heat generating resistor with an AC voltage; a temperature detecting element for detecting a temperature of the heater; and a control device, responsive to an output of the temperature detecting element, to control a phase of the AC voltage.
Claims7
An image fixing apparatus, comprising:
- a heater for generating heat upon electric power supply thereto;
- a film movable with an unfixed image on a recording material while being in contact with said heater;
- a temperature detecting element for detecting the temperature of said heater;
- power supply means for supplying electrical power to said heater;
- and
- control means for controlling the electrical power supplied to said heater from said power supply means so that a temperature detected by said temperature detecting element is maintained substantially at a predetermined fixing temperature,
- wherein said control means has at least one power level for raising the temperature of said heater and a plurality of power levels for decreasing the temperature of said heater, and selects the power level in accordance with an output of said temperature detecting element after the temperature of said heater initially reaches the fixing temperature.
4 more elements
Dependencies are inferred from the claim text.