Abstract: An image heating device has a paper-passing heating region in which a recording material passes through at least a part of a heating region and a non-paper-passing heating region in which the recording material does not pass through the heating region, and changes a heating amount applied to a fixing member in the non-paper-passing heating region in accordance with a longitudinal distance between a boundary position between the paper-passing heating region and the non-paper-passing heating region in the longitudinal direction and the boundary position side end portion of the recording material in the paper-passing heating region.

Abstract: An image heating apparatus includes first and second heat generating elements arranged adjacent to each other, and a control portion that controls power supplied to the first and second heat generating elements, and that is capable of individually controlling the first and second heat generating elements, the first and second heat generating elements being respectively controlled so as to maintain a control temperature. When an image exists in a second region on the recording material heated by the second heat generating element, and an image does not exist in a first region on the recording material heated by the first heat generating element, the control portion sets the control temperature of the second heat generating element, when heating the second region, in accordance with a distance between an end section of the image in the second region and a boundary of the first region and the second region.

Abstract: An image heating apparatus includes a heater including a first heat generating block and a second heat generating block, and a power control portion that controls electrical power to be supplied to the respective heat generating blocks. When a recording material passes the position of the heater, and, in a longitudinal direction of the heater, when an entire range in which the second heat generating block is provided is a range in which the recording material passes and only a portion of a range in which the first heat generating block is provided is a range in which the recording material passes, the power control portion controls the electrical power to be supplied to the respective heat generating blocks so that electrical power Wd supplied to the first heat generating block is less than electrical power Wc supplied to the second heat generating block.

Abstract: An image heating apparatus includes a first and second heat generating elements, a thyristor that controls electrical power supplied to the heat generating elements, and a relay that switches a supply destination of the electrical power supply between the heat generating elements. A controller switches the thyristor from on to off, and then actuates the relay to switch the supply destination from the first heat generating element to the second heat generating element, and, thereafter switches the thyristor from off to on. The controller sets a timing of switching of the thyristor from on to off to be in a period in which an image on a current recording material is in a nip, and sets timing of switching of the thyristor from off to on to be in a period in which an image on a current recording material or a subsequent recording material is not in the nip.

Abstract: A heater wherein an elongated substrate, a first electroconductive member, a second electroconductive member, a plurality of heat generating resistors, and a temperature detecting element. The following relationships are satisfied: W?L and W?S, where W represents a dimension of the temperature detecting element measured in a longitudinal direction of the substrate, L represents a dimension, measured in the longitudinal direction, of one of the heat generating resistors at least partially overlapping with the temperature detecting element with respect to the longitudinal direction, and S represents a dimension between adjacent heat generating elements of the heat generating elements.

Abstract: An image heating apparatus includes a heater including a first heat generating block and a second heat generating block, and a power control portion that controls electrical power to be supplied to the respective heat generating blocks. When a recording material passes the position of the heater, and, in a longitudinal direction of the heater, when an entire range in which the second heat generating block is provided is a range in which the recording material passes and only a portion of a range in which the first heat generating block is provided is a range in which the recording material passes, the power control portion controls the electrical power to be supplied to the respective heat generating blocks so that electrical power Wd supplied to the first heat generating block is less than electrical power Wc supplied to the second heat generating block.

Abstract: An image heating apparatus includes first and second heat generating elements arranged adjacent to each other, and a control portion that controls power supplied to the first and second heat generating elements, and that is capable of individually controlling the first and second heat generating elements, the first and second heat generating elements being respectively controlled so as to maintain a control temperature. When an image exists in a second region on the recording material heated by the second heat generating element, and an image does not exist in a first region on the recording material heated by the first heat generating element, the control portion sets the control temperature of the second heat generating element, when heating the second region, in accordance with a distance between an end section of the image in the second region and a boundary of the first region and the second region.

Abstract: An image heating apparatus includes a nip forming unit; a first and second heat generating elements for heating said nip; a thyristor for controlling electric power to the heat generating elements; a relay for switching an electric power supply destination between the first and second heat generating elements; and a controller. When the controller switches the destination from the first heat generating element to the second heat generating element during heating the images on continuously supplied sheets, the controller switches the thyristor from on-state to off-state, and then actuates the relay to switch the supply destination from the first heat generating element to the second heat generating element, and thereafter switches the thyristor from the off-state to the on-state. The controller sets timing of a period for switching the supply destination such that the image on the sheet is not influenced by a temperature drop in the period.

Abstract: An image heating apparatus includes first and second heat generating elements arranged adjacent to each other, and a control portion that controls power supplied to the first and second heat generating elements, and that is capable of individually controlling the first and second heat generating elements, the first and second heat generating elements being respectively controlled so as to maintain a control temperature. When an image exists in a second region on the recording material heated by the second heat generating element, and an image does not exist in a first region on the recording material heated by the first heat generating element, the control portion sets the control temperature of the second heat generating element, when heating the second region, in accordance with a distance between an end section of the image in the second region and a boundary of the first region and the second region.

Abstract: An image heating apparatus includes a heater including a first heat generating block and a second heat generating block, and a power control portion that controls electrical power to be supplied to the respective heat generating blocks. When a recording material passes the position of the heater, and, in a longitudinal direction of the heater, when an entire range in which the second heat generating block is provided is a range in which the recording material passes and only a portion of a range in which the first heat generating block is provided is a range in which the recording material passes, the power control portion controls the electrical power to be supplied to the respective heat generating blocks so that electrical power Wd supplied to the first heat generating block is less than electrical power We supplied to the second heat generating block.

Abstract: An image heating apparatus includes a first heat generating element; a second heat generating element which is arranged adjacent to the first heat generating element in a longitudinal direction; and a control portion which controls power supplied to the first and second heat generating elements. When an image exists in a second region on the recording material heated by the second heat generating element but an image does not exist in a first region on the recording material heated by the first heat generating element, the control portion sets a control temperature of the second heat generating element when heating the second region, in accordance with a distance between an end section of the image in the second region and a boundary of the first region and the second region.

Abstract: An image heating apparatus heats an image formed on a recording material and includes a heater having a first heat generating block and a second heat generating block adjacent to the first. A power control portion controls electrical power supplied to the first and second blocks, independently. When an entire range in which the second block is provided is a range in which the recording material passes and only a portion of a range in which the first block is provided, electrical power supplied to the first is less than that supplied to the second. The power control portion controls the power so that a ratio of the power supplied to the first block to the power supplied to the second block decreases as a recording material passing range, in the range in which the first block is provided, decreases.

Abstract: An apparatus includes a heater including a first and second heat generating blocks; and a power control portion that controls electric power to be supplied to respective heat generating blocks. When a recording material passes the position of the heater, and in a longitudinal direction of the heater, when an entire range in which the second heat generating block is provided is a range in which the recording material passes and only a portion of a range in which the first heat generating block is provided is a range in which the recording material passes, the power control portion controls the electric power to be supplied to respective heat generating blocks so that an electric power Wd supplied to the first heat generating block is smaller than an electric power Wc supplied to the second heat generating block.

Abstract: An image heating apparatus includes a first heat generating element; a second heat generating element which is arranged adjacent to the first heat generating element in a longitudinal direction; and a control portion which controls power supplied to the first and second heat generating elements. When an image exists in a second region on the recording material heated by the second heat generating element but an image does not exist in a first region on the recording material heated by the first heat generating element, the control portion sets a control temperature of the second heat generating element when heating the second region, in accordance with a distance between an end section of the image in the second region and a boundary of the first region and the second region.

Abstract: The heater to be used for an image heating apparatus includes a substrate, and first and second heat generation lines that are provided on the substrate along a longitudinal direction of the substrate, and are each divided into a plurality of heat generation blocks that can be mutually independently controlled, in the longitudinal direction, wherein in the plurality of heat generation blocks in the second heat generation line, a heat generation block is provided that overlaps one heat generation block in the first heat generation line in the longitudinal direction, and has a different heat generation distribution in the longitudinal direction, and can be independently controlled. Accordingly, the heater can form a heat generation distribution that is suitable for various paper sizes.

Abstract: A heater including a substrate, a first heat generating line provided on the substrate and in a longitudinal direction of the substrate, the first heat generating line being divided into a plurality of heat generating blocks in the longitudinal direction, the plurality of heat generating blocks being controllable independently, and a second heat generating line provided on the substrate and in the longitudinal direction of the substrate, the second heat generating line being divided into a plurality of heat generating blocks in the longitudinal direction, the plurality of heat generating blocks being controllable independently. In the heater, divided positions of the first heat generating line and divided positions of the second heat generating line are different.

Abstract: The heater to be used for an image heating apparatus includes a substrate, and first and second heat generation lines that are provided on the substrate along a longitudinal direction of the substrate, and are each divided into a plurality of heat generation blocks that can be mutually independently controlled, in the longitudinal direction, wherein in the plurality of heat generation blocks in the second heat generation line, a heat generation block is provided that overlaps one heat generation block in the first heat generation line in the longitudinal direction, and has a different heat generation distribution in the longitudinal direction, and can be independently controlled. Accordingly, the heater can form a heat generation distribution that is suitable for various paper sizes.

Abstract: A heater including a substrate, a first heat generating line provided on the substrate and in a longitudinal direction of the substrate, the first heat generating line being divided into a plurality of heat generating blocks in the longitudinal direction, the plurality of heat generating blocks being controllable independently, and a second heat generating line provided on the substrate and in the longitudinal direction of the substrate, the second heat generating line being divided into a plurality of heat generating blocks in the longitudinal direction, the plurality of heat generating blocks being controllable independently. In the heater, divided positions of the first heat generating line and divided positions of the second heat generating line are different.

Abstract: The fixing apparatus includes a sleeve, a nip portion forming member that contacts an inner surface of the sleeve, a pressure member, and a regulation member for regulating movement of the sleeve. The regulation member includes a first surface and a second surface. The first surface on an upstream side of the nip portion in a conveyance direction of the recording material includes a region in which the distance between the inner surface of the sleeve and the first surface in a radial direction of the sleeve increases toward a center portion of the sleeve in the generatrix direction, and in which the end surface of the sleeve contacts the region when the sleeve moves in the generatrix direction.

Abstract: A fixing apparatus includes a cylindrical film, a heater including a substrate, a first heat generation resistor formed on a first surface of the substrate which is a surface facing an inner surface of the film, and a second heat generation resistor formed on a second surface opposite to the first surface, and a control portion, wherein during a time period from the start of warm-up of the fixing apparatus to a predetermined time, the control portion is configured either to supply power to the first heat generation resistor while supplying no power to the second heat generation resistor or to supply power to the first heat generation resistor and the second heat generation resistor such that the power supplied to the first heat generation resistor is higher than the power supplied to the second heat generation resistor.