Fixing device and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorYoshiharu KANEMATSU
Life of this patent
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Abstract
A fixing device includes a rotatable cylindrical heating roller, a heat source and a pressing roller. The heat source is arranged in a hollow inner space of the heating roller. The pressing roller is pressed against the heating roller to form a fixing nip through which a sheet is passed in a sheet passing direction. The heating roller has a substrate layer and a heat conductive layer. The substrate layer is formed such that both end portions in a width direction perpendicular to the sheet passing direction are made thinner than a center portion in the width direction, within a sheet passing area through which the sheet is passed. The heat conductive layer is provided around an outer circumferential face of the substrate layer and has a heat conductivity higher than the substrate layer.
Claims11
A fixing device comprising:
- a rotatable cylindrical heating roller,
- a heat source arranged in a hollow inner space of the heating roller, and
- a pressing roller pressed against the heating roller to form a fixing nip through which a sheet is passed in a sheet passing direction,
- wherein the heating roller has
- a substrate layer formed such that both end portions in a width direction perpendicular to the sheet pas sing direction are made thinner than a center portion in the width direction, within a sheet passing area through which the sheet is passed, and
- a heat conductive layer provided around an outer circumferential face of the substrate layer and having a heat conductivity higher than the substrate layer.
Dependencies are inferred from the claim text.