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US 10,649,376 B2Granted
Image heating apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYusuke Jota, Atsushi Iwasaki
Life of this patent
Estimating the term…
Abstract
When a nip portion has a region through which a recording material passes, and a part of the region is an image heating region where an image region on the recording material passes through, and the rest of the region is a non-image heating region where a non-image region on the recording material passes through, a control portion controls heating elements corresponding to the non-image heating region, out of the plurality of heating elements, so as to maintain a control target temperature, which is set based on the amount of the image heating apparatus used.
Claims10
An image heating apparatus comprising:
- a heating unit which includes a heater having a plurality of heating elements arranged in a direction perpendicular to a transporting direction of a recording material, and heats an image formed on the recording material using the heat of the heater;
- a pressure member which forms a nip portion by press-contacting the heating unit, and rotates, the pressure member having a circumference increasing from the center portion toward the ends in the arrangement direction of the plurality of heating elements;
- and
- a control portion which controls power supplied to each of the plurality of heating elements individually,
- wherein when the nip portion has a region through which the recording material passes, and a part of the region is an image heating region where an image region on the recording material passes through, and the rest of the region is a non-image heating region where a non-image region on the recording material passes through, the control portion controls power supplied to the heating elements corresponding to the non-image heating region, out of the plurality of heating elements, so as to maintain a control target temperature, which is set based on a used amount of the image heating apparatus, and
- wherein the control target temperature is a temperature at which an inverted crown amount, which is a difference between an outer diameter at the ends of the pressure member and an outer diameter at the center portion of the pressure member, is maintained at a predetermined amount.
3 more elements
An image forming apparatus comprising:
- an image forming portion which forms an image on a recording material;
- and
- a fixing portion which fixes the image formed on the recording material to the recording material,
- wherein the fixing portion includes
- a heating unit which includes a heater having a plurality of heating elements arranged in a direction perpendicular to a transporting direction of the recording material, and heats an image formed on the recording material using the heat of the heater;
- a pressure member which forms a nip portion by press-contacting the heating unit, and rotates, the pressure member having a circumference increasing from the center portion toward the ends in the arrangement direction of the plurality of heating elements;
- and
- a control portion which controls power supplied to each of the plurality of heating elements individually,
- wherein when the nip portion has a region through which the recording material passes, and a part of the region is an image heating region where an image region on the recording material passes through, and the rest of the region is a non-image heating region where a non-image region on the recording material passes through, the control portion controls power supplied to the heating elements corresponding to the non-image heating region, out of the plurality of heating elements, so as to maintain a control target temperature, which is set based on a used amount of the image heating apparatus, and
- wherein the control target temperature is a temperature at which an inverted crown amount, which is a difference between an outer diameter at the ends of the pressure member and an outer diameter at the center portion of the pressure member, is maintained at a predetermined amount.
7 more elements
Dependencies are inferred from the claim text.