Heater and heat fixing apparatus having a resistance adjustment portion
AssigneeCanon Kabushiki Kaisha
InventorAtsuyoshi Abe
Life of this patent
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Abstract
A heater includes a substrate; a heat generating resistor on the substrate to generate heat when supplied with electric energy; a pair of electrodes for supplying the energy to the heat generating resistor; and a resistance adjustment portion for adjusting the resistance between the electrodes. The resistance adjustment portion adjusts the resistance while maintaining uniform electrical conductivity between the electrodes and the heat generating resistor.
Claims28
A heater comprising:
- a substrate;
- a heat generating resistor on said substrate to generate heat when supplied with electric energy;
- a pair of electrodes for supplying the energy to said heat generating resistor;
- and
- a resistance adjustment portion for adjusting the resistance between said electrodes,
- wherein said resistance adjustment portion adjusts the resistance while maintaining uniform electrical conductivity between said electrodes and said heat generating resistor.
A heat fixing apparatus for heat-fixing a toner image on a recording material, comprising:
- a heater;
- and
- a film movable with the recording material, one surface of said film being in contact with said heater, and the other surface being contactable with the recording material,
- wherein heat from said heater is transferred to the recording material through said film, and
- wherein the heater comprises:
- a substrate;
- a heat generating resistor on said substrate to generate heat when supplied with electric energy;
- a pair of electrodes for supplying the energy to said heat generating resistor;
- and
- a resistance adjustment portion provided between said heat generating resistor and one of said pair of electrodes, for adjusting the resistance between said electrodes,
- wherein said resistance adjustment portion adjusts the resistance while maintaining uniform electrical conductivity between said electrodes and said heat generating resistor.
A heater comprising:
- a substrate;
- a heat generating resistor on said substrate to generate heat when supplied with electric energy;
- an electrode for supplying energy to said heat generating resistor;
- and
- a high resistance portion provided between said heat generating resistor and said electrode,
- wherein said high resistance portion is wider than said heat generating resistor, in a direction perpendicular to the energy supply direction, and has a higher resistance than that of said electrode,
- wherein said high resistance portion adjusts the resistance between said heat generating resistor and said electrode while maintaining uniform electrical conductivity between said electrode and said heat generating resistor.
A heat fixing apparatus for heat-fixing a toner image on a recording material, comprising:
- a heater;
- and
- a film movable with the recording material, one of the surfaces of said film being in contact with said heater, and the other being contactable with the recording material,
- wherein heat from said heater is transferred to the recording material through said film,
- said heater comprising:
- a substrate;
- a heat generating resistor on said substrate for generating heat when supplied with electric energy;
- an electrode for supplying energy to said heat generating resistor;
- and
- a high resistance portion provided between said heat generating resistor and said electrode,
- wherein said high resistance portion is wider than said heat generating resistor, in a direction perpendicular to the energy supply direction, and has a higher resistance than that of said electrode,
- wherein said high resistance portion adjusts the resistance between said heat generating resistor and said electrode while maintaining uniform electrical conductivity between said electrode and said heat generating resistor.
Dependencies are inferred from the claim text.