Image heating apparatus and image forming apparatus
First Claim
Patent Images
1. 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, andwherein 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.
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Accused Products
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.
16 Citations
10 Claims
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1. An image heating apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image forming apparatus comprising:
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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.
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Specification
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Current AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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Original AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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InventorsJota, Yusuke, Iwasaki, Atsushi
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Primary Examiner(s)Aydin, Sevan A
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Application NumberUS16/388,414Publication NumberTime in Patent Office390 DaysField of SearchUS Class CurrentCPC Class CodesG03G 15/2039 with means for controlling ...G03G 15/2042 specially for the axial hea...G03G 15/2053 Structural details of heat ...G03G 15/2064 combined with pressureG03G 15/5004 Power supply control, e.g. ...G03G 2215/2035 the fixing nip having a sta...
