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US 11,493,865 B2Granted
Image heating device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorHiroyuki Kadowaki
Life of this patent
Estimating the term…
Abstract
An image heating device includes a heater having a plurality of heating elements that heat a plurality of heating regions and a control portion that controls the supply of electric power to the plurality of heating elements. The power supply is controlled so that a first average temperature, which is an average value of control target temperatures of heating regions included in a first region located closer to one end side than a central heating region in a direction orthogonal to a conveying direction of a recording material, and a second average temperature, which is an average value of control target temperatures of heating regions included in a second region located closer to the other end side than the central heating region, are within a predetermined temperature range.
Claims12
An image heating device comprising:
- a heater having a plurality of heating elements arranged in a longitudinal direction of the heater orthogonal to a conveying direction of a recording material;
- an acquisition portion that acquires information of an image to be formed on the recording material, and
- a control portion that independently controls electric power supplied to each of the plurality of heating elements so that each of a plurality of heating regions heated by the plurality of heating elements is maintained at a control target temperature,
- wherein
- the image formed on the recording material is heated by the heat of the heater,
- the control portion sets respective control target temperatures of image heating regions through which the image passes in accordance with the acquired information,
- the control portion sets respective preset temperatures of non-image heating regions through which the image does not pass, that are located closer to one end side than a central heating region in the longitudinal direction, and sets respective preset temperatures of non-image heating regions through which the image does not pass, that are located closer to the other end side than the central heating region in the longitudinal direction, and
- the control portion corrects the respective preset temperatures to the control target temperatures such that a difference between a first average temperature, which is an average value of the respective preset temperatures in a predetermined number of heating regions located closer to the one end side, and a second average temperature, which is an average value of the respective preset temperatures in a predetermined number of heating regions located closer to the other end side, is within a predetermined temperature range.
5 more elements
An image heating device comprising:
- a heater having a plurality of heating elements arranged in a direction orthogonal to a conveying direction of a recording material;
- a control portion that controls temperatures of a plurality of heating regions heated by the plurality of heating elements individually by controlling electric power to be supplied to the plurality of heating elements individually;
- and
- an acquisition portion that acquires information on an image to be formed on the recording material, wherein
- the image formed on the recording material is heated by the heat of the heater, and
- the control portion controls the supply of electric power to the plurality of heating elements such that:
- when an average value of control target temperatures of heating regions included in a first region located closer to one end side than a central heating region in a direction orthogonal to the conveying direction among the plurality of heating regions is a first average temperature,
- an average value of control target temperatures of heating regions included in a second region located closer to the other end side than the central heating region is a second average temperature, and
- an average value of control target temperatures of heating regions included in a third region between the first region and the second region, including at least the central heating region is a third average temperature,
- relationships that the third average temperature is equal to or higher than the first average temperature and the third average temperature is equal to or higher than the second average temperature are satisfied, and
- a sum of a difference between the first average temperature and the third average temperature and a difference between the second average temperature and the third average temperature is smaller than a predetermined threshold value.
8 more elements
An image forming apparatus comprising:
- an image forming portion that forms an image on a recording material;
- a fixing portion that fixes the image formed on the recording material to the recording material, the fixing portion includes a heater for heating the image in which a plurality of heating elements are arranged in a longitudinal direction of the heater orthogonal to a conveying direction of a recording material;
- and
- a control portion that independently controls electric power supplied to each of the plurality of heating elements so that each of a plurality of heating regions heated by the plurality of heating elements is maintained at a control target temperature,
- wherein the control portion sets respective control target temperatures of image heating regions through which the image passes higher than respective control target temperatures of non-image heating regions through which the image does not pass, and
- in a case where a number of the non-image heating regions located closer to one end side in the longitudinal direction is larger than a number of the non-image heating regions located closer to the other end side in the longitudinal direction, the control portion sets the respective control target temperatures of the non-image heating regions located closer to the one end side higher than the respective control target temperatures of the non-image heating regions located closer to the other end side.
3 more elements
Dependencies are inferred from the claim text.