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US 5,204,723 AGranted
Heating apparatus having heater with branch
AssigneeCanon Kabushiki Kaisha
InventorsShinji Hanada, Hisaaki Senba, Koji Masuda
Life of this patent
Estimating the term…
Abstract
A heating apparatus includes a heater, the heater including a main resistance layer and a subordinate resistance layer branched from said main resistance layer, which extend in a direction crossing with a movement direction of a recording material and which are supplied with electric power; a selector for selecting a resistance layer for supplying electric power; and a controller for controlling an effective voltage applied to said heater in accordance with selected resistance layer.
Claims21
A heating apparatus, comprising:
- a heater, said heater including a main resistance layer and a subordinate resistance layer branched from said main resistance layer which extend in a direction crossing with a movement direction of a recording material and which are supplied with electric power;
- selecting means for selecting a resistance layer to be supplied with electric power in accordance with a size of the recording material, said selecting means selecting the resistance layers so that a number of resistance layers selected is larger in an area where the recording material does not pass than in an area where the recording material passes;
- and
- control means for controlling an effective voltage applied to said heater in accordance with selected resistance layer.
1 more element
A heating apparatus, comprising:
- a heater including a main resistance layer and a subordinate resistance layer branched therefrom which extend in a direction perpendicular to a movement direction of a recording material and which are supplied with electric power;
- selecting means for selecting a resistance layer to be supplied with electric power in accordance with a width of the recording material, said selecting means selecting the resistance layers so that a number of resistance layers selected is larger in an area where the recording material does not pass than in an area where the recording material passes;
- and
- control means for controlling the power supply in accordance with selection by said selecting means, wherein said control means decreases the power with decrease of the width of the recording material.
1 more element
A heating apparatus, comprising:
- a heater including a main resistance layer and a subordinate resistance layer branched from said main resistance layer which extend in a direction perpendicular to a movement direction of a recording material and which are supplied with electric power;
- selecting means for selecting a resistance layer to be supplied with the electric power in accordance with a size of the recording material, said selecting means selecting the resistance layers so that a number of resistance layers selected is larger in an area where the recording material does not pass than in an area where the recording material passes;
- and
- control means for controlling power supply period per unit time in accordance with the resistance layer selected.
1 more element
Dependencies are inferred from the claim text.