Abstract: A fuser is described including a heater, a belt, a rotating member, and a pad. A nip portion is formed between the belt and the rotating member as the pad presses the belt toward the rotating member. The pad is biased toward a restricting member. The biasing may be performed by one or more springs. The spring may be a compression spring, a tension spring, and/or a plate spring among other types of springs.

Abstract: A heating device configured to heat a medium on which a liquid for printing is impinged includes a heating element configured to face a processing surface, the processing surface being a surface on which the liquid is impinged, a blower configured to blow gas to a heating region between the heating element and the processing surface from the heating element side of the medium, and a control unit configured to control an output of the heating element and a driving amount of the blower. The control unit changes the driving amount of the blower in accordance with a type of the medium while maintaining the output of the heating element constant regardless of the type of the medium. The decrease in the drying efficiency of the medium is suppressed.

Abstract: A heater fixing holder is configured to be detachably attached on a heating roller and a heater inside the heating roller. The heating roller constitutes part of a fixing device configured to fix an image onto a recording medium. The heater fixing holder includes a fitting portion configured to be penetrated with and fit with an end portion of the heater and a gripping portion configured to hold an outer peripheral surface of the heating roller. The heater fixing holder is configured to hold and fix the heater at a position at which the heater does not contact an inner wall of the heating roller.

Abstract: A fixing apparatus includes a thermal conductive member that is in contact with a heater and has a thermal conductivity higher than the thermal conductivity of a base material of the heater, and a thermal-resistant member that is disposed between the thermal conductive member and a support member configured to support the heater, a thermal resistance in a thickness direction of the thermal-resistant member being higher than the thermal resistance in the thickness direction of the thermal conductive member.

Abstract: A heating device includes a surface heater unit including a heater portion that generates heat in a region extending in a longitudinal direction, the surface heater unit heating a heating object; a support unit that supports the surface heater unit; and a heat conducting unit disposed in contact with a surface of the surface heater unit at a side opposite to a side adjacent to the heating object in a region between a center of the heater portion in a direction crossing the longitudinal direction and the support unit.

Abstract: A fixing device according to an embodiment includes a fixing belt, a pressurizing roller, a supporting member and a heating member. The fixing belt is supported to be capable of circularly moving and is formed endless. The pressurizing roller comes into contact with an outer circumferential surface of the fixing belt and forms a nip for holding a sheet. The supporting member is disposed on an inner side of the fixing belt and extends in an axial direction of the fixing belt. The heating member is disposed on the inner side of the fixing belt and supported by the supporting member and extends in the axial direction of the fixing belt. If the pressurizing roller does not pressurize the fixing belt, end portions of a second principal plane opposite to a first principal plane on the pressurizing roller side of the heating member are separated from the supporting member.

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: A belt heating device includes an endless belt and a heater that heats the endless belt and includes a heat generator. A driving roller contacts the endless belt. A driving force transmitter is disposed at a lateral end of the driving roller in an axial direction thereof. The driving force transmitter transmits a driving force that drives and rotates the driving roller. The driving force transmitter is disposed in a driving side defined by a center of the heat generator in a longitudinal direction of the heater. A counterpart is disposed opposite the heater. A positioner positions the heater with respect to the counterpart in the longitudinal direction of the heater. The positioner is disposed in a positioning side defined by the center of the heat generator in the longitudinal direction of the heater. The positioning side is opposite the driving side in the longitudinal direction of the heater.

Abstract: A fixing device includes a belt, a roller, a heater, a reflector, and a fixed support against which the roller presses the belt. The belt is rotatable in a rotational direction. The roller is positioned to be in contact with an outer peripheral surface of the belt so as to form a nip between the roller and the belt. The heater is disposed within an inner circumference of the belt. The reflector includes a first portion. The first portion is in contact with the belt at a first region downstream with respect to the nip in the rotational direction. The reflector covers the fixed support. A plurality of gaps are formed between the reflector and the fixed support so as to suppress heat conduction from the reflector to the fixed support.

Abstract: In an image heating device having a plurality of heating blocks which are controllable independently in a longitudinal direction of a heater, an increase of the size of the heater can be suppressed, and temperatures of a plurality of heating block can be detected. A heater has a first temperature sensor corresponding to a first heating block, a second temperature sensor corresponding to a second heating block, a first electric conductor electrically coupled to the first temperature sensor, a second electric conductor electrically coupled to the second temperature sensor, and a common electric conductor electrically coupled to the first and second temperature sensors.

Abstract: An image heating apparatus includes a rotatable belt, a driving source, a heating portion, a heat shielding member, a shielding member moving mechanism, and a controller. The controller is configured to control the moving mechanism so that the shielding member is in a shielding position and rotation of the belt is at rest in a stand-by state in which the image heating apparatus waits for input of an image forming signal for forming the image.

Abstract: A fixing device includes a heat source, a support portion, at least one adhesive layer, and a heat transfer member. The support portion supports the heat source. The at least one adhesive layer fixes the heat source and the support portion to each other. The heat transfer member is disposed at a portion other than a portion between the adhesive layer and the heat source to conduct heat of a portion of the heat source to another portion of the heat source.

Abstract: A fixing device includes a roller, an endless belt, and a heat generating member disposed in a space inside the endless belt, extending in a width direction of the endless belt, and pressing the endless belt against the roller. A sheet is passed through a nip formed between the roller and a portion of the endless belt pressed by the heat generating member, such that an image on the sheet is fixed thereto. The heat generating member includes first and second heat generating portions that are adjacent to each other along the width direction, and the first portion heat generating is independently operable from the second heat generating portion.

Abstract: A fixing device includes: a heater including a substrate, and a heating pattern; an endless belt configured to rotate around the heater; and a pressure roller. The endless belt is nipped between the pressure roller and the heater. The endless belt is nipped by the substrate and the pressure roller to form a nip portion including a first portion and a second portion. The length of the first portion in a moving direction of the endless belt at the nip portion is less than that of the second portion in the moving direction. The substrate includes: a third portion located corresponding to the first portion in a longitudinal direction of the substrate; and a fourth portion located corresponding to the second portion in the longitudinal direction. The length of the third portion in the moving direction is less than that of the fourth portion in the moving direction.

Abstract: A fixing device includes: a substrate; an endless belt rotatable around the substrate; a heating pattern including a heating resistor provided on the substrate; a terminal electrically continuous to the heating pattern and provided at an end portion of the substrate in a longitudinal direction of the substrate; a connector including an electrode connected to the terminal, the connector being mounted to the end portion of the substrate from one side of the substrate in a widthwise direction of the substrate and engaged with the substrate in the longitudinal direction to restrict movement of the connector with respect to the longitudinal direction; and an engaging member mounted to the connector from the other side of the substrate in the widthwise direction and engaged with the substrate in the longitudinal direction to restrict movement of the engaging member with respect to the longitudinal direction.

Abstract: A fixing device includes a hollow rotating body, a sheet-shaped heater that is disposed inside the rotating body in such a manner as to extend in a width direction perpendicular to a transport direction of a recording medium, which is transported along with rotation of the rotating body, and that heats the rotating body, and multiple thermal-conductive members that are arranged in such a manner as to be in contact with a surface of the sheet-shaped heater, the surface being opposite to a contact surface of the sheet-shaped heater that is in contact with the rotating body, with a gap formed between the multiple thermal-conductive members in at least one of the width direction and the transport direction and that conduct heat of the sheet-shaped heater in the width direction, the multiple thermal-conductive members being arranged such that a first thermal-conductive member and a second thermal-conductive member that are included in the multiple thermal-conductive members and that are adjacent to each other part

Abstract: According to one embodiment, a heating device includes a cylindrical body, a heater unit, a support member, a first heat transfer unit, and a second heat transfer unit. The cylindrical body has a film shape. The heater unit is disposed inside the cylindrical body. In the heater unit, the axial direction of the cylindrical body is taken as a longitudinal direction. The support member supports the heater unit. The first heat transfer unit is disposed between the inner surface of the cylindrical body and the heater unit. The first heat transfer unit abuts on a first surface of the heater unit. The second heat transfer unit is disposed between the heater unit and the support member. The second heat transfer unit abuts on a second surface of the heater unit opposite to the first surface.

Abstract: An image forming apparatus includes a fixing unit including a fixing belt having a surface to which a lubricant is applied, a heater contacting the surface and including heating elements arranged along a width direction of the belt and including first end second end heating elements and a central heating element, and a pressing roller capable of pressing and rotating the belt, a power supply configured to supply power to the heating elements, and a controller configured to determine a first amount of power to be supplied to the central heating element and a second amount of power to be supplied to each end heating element such that the first amount is greater than the second amount, and control the power supply to supply the first and second amounts to the central heating element and each end heating element before controlling the pressing roller to rotate.

Abstract: A fixing device includes a belt unit and an opposite member. The belt unit and opposite member are configured to, when a recording medium with a developer image transferred thereon passes through a nip region formed by the belt unit and opposite member, fix the developer image to the recording medium. The belt unit includes an endless belt, a heater group including a plurality of stacked heaters, and a holder that holds the heater group inside the belt.

Abstract: An image forming apparatus includes an image holding member, a charging unit that charges a surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes an electrostatic charge image developing toner and that develops the electrostatic charge image on the surface of the image holding member with the electrostatic chare image developing toner to form a toner image, an intermediate transfer body having a circumferential surface of which micro rubber hardness is in a range of 45 to 65, a first transfer unit that first transfers the toner image formed on the surface of the image holding member to a surface of the intermediate transfer body, and a second transfer unit that second transfers the toner image transferred to the surface of the intermediate transfer body to a recording medium, wherein the electrostatic charge image developing toner satisfies the following formul

Abstract: In a case where fixing processing is performed continuously on sheets having a width that is shorter than a length of a heat generation member in a longitudinal direction and longer than a length of another heat generation member in the longitudinal directions, the CPU determines a timing to switch between the heat generation member and the another heat generation member by a heat generation member switching device based on information relating to a size of the sheet.

Abstract: A fixing device includes a fixing rotator, a hollow pressure rotator, a heater, a holder, and a bearing. The pressure rotator is configured to contact the fixing rotator. The heater is disposed inside the pressure rotator. The holder is configured to hold the pressure rotator and the heater. The bearing is configured to rotatably support the pressure rotator. The holder includes a curved face contact portion having a curved face conforming to an outer circumferential surface of the bearing to contact the bearing. The bearing includes a flange. The flange is configured to divide the bearing into an inboard area and an outboard area in an axial direction of the pressure rotator. The inboard area and the outboard area are asymmetrical.

Abstract: The invention relates to an oven for the thermal treatment of filaments, which comprises: an oven body (1) having a height greater than its width, with a first end (1.1) and a second end (1.2); conduction means (2) for conducting the filaments, comprising first rotary supports (2.1) and second rotary supports (2.2) between which the filaments are threaded; a platform (3) on which the conduction means (2) for conducting the filaments are arranged and which is pivotably arranged at the first end (1.1) of the oven body (1); and attachment means (4) attaching the platform (3) to the second end (1.2) of the oven body (1), transferring the movements of the second end (1.2) of the oven body (1) to the platform (3), such that it assures that the filaments remain parallel to one another, preventing them from becoming deformed or from coming into contact with one another.

Abstract: An irradiator that emits electromagnetic waves through a lattice-like or net-like protective member, and a controller that causes the irradiator to irradiate an irradiation target with the electromagnetic waves while causing relative movement between the irradiation target and the irradiator in a first direction. The protective member is configured or disposed such that no more than one lattice of a plurality of lattices and no more than one node of a plurality of nodes that are formed in the protection member exist in a row along the first direction.

Abstract: A heater assembly for an aerosol-generating system includes a glass substrate including perforations and a heater element. The heater element may be located in the glass substrate, on the glass substrate, or both in and on the glass substrate. The heater element may include a plurality of parallel strips and a plurality of transversal strips. The plurality of parallel strips and the plurality of transversal strips form a grid.

Abstract: An image heating apparatus includes a heater that includes a substrate having a longitudinal direction arranged in a direction orthogonal to a direction in which a recording material is transported, a heat-generating element provided in the substrate, and an electrode configured to feed electric power to the heat-generating element, and a terminal to be electrically connected to the electrode, wherein an image formed on the recording material is heated by heat from the heater. A conductive intermediate member including at least one layer is provided between the terminal and the electrode, and a first fixing region in which the electrode and the intermediate member are fixed and a second fixing region in which the terminal and the intermediate member are fixed are shifted from each other in the longitudinal direction.

Abstract: A fixing device including a fixing belt having a maximum curvature in a rotational direction of the fixing belt. The number of times the fixing belt is bent when a temperature of the fixing belt is equal to or lower than a glass transition temperature of the fixing belt surface material is controlled to operate within a specified range.

Abstract: An image forming apparatus includes an image forming unit, a fixing device, and a control circuit. The control circuit acquires a selection signal indicating which mode is selected from among options. The options include at least two modes, including a first mode in which an image is formed using a non-decolorable first toner, a second mode in which the image is formed using a decolorable second toner, and a third mode in which the image is erased by heating a sheet on which the image is formed by the second toner using the fixing device at a decolorizing temperature. The control circuit sets a different standby temperature in accordance with the mode indicated by the selection signal, and controls a temperature of the fixing device to be the standby temperature, in a standby state before an operation start reception.

Abstract: An image heating apparatus includes an image heating portion including a heater having a substrate and a heat generating element disposed on the substrate. The image heating portion heats and fixes an image onto a recording material by using the heat of the heater. The heater includes a conductor disposed in a position closer to the edge of the substrate than to the heat generating element on a surface on an opposite side to the surface on which the heat generating element is disposed, an electrification control portion to control electrification to the heat generating element, a power interrupting portion to execute an interrupt operation that interrupts the supply of power to the heat generating element, and a damage detecting portion to detect breakage of the conductor. The damage detecting portion causes the power interrupting portion to execute the interrupting operation when the conductor is broken.

Abstract: A fixing device includes a first rotator, a second rotator disposed opposite the first rotator to form a nip with the first rotator, a heater including a base and a heat generator, and a non-contact temperature detector to detect a temperature of the heater. The heater contacts an inner circumferential surface of the first rotator. The non-contact temperature detector is disposed opposite the inner circumferential surface of the first rotator via the base and disposed at a predetermined distance from the heater.

Abstract: An image forming apparatus includes a resistive heat generator, a temperature detector, and a power controller that detects a temperature-resistance property of the resistive heat generator before the resistive heat generator is used when the resistive heat generator is removably installed. The power controller obtains power supplied to the resistive heat generator and a change in a temperature of the resistive heat generator, that is detected by the temperature detector, while the power controller supplies the power at a predetermined power duty cycle for adjustment to the resistive heat generator. The power controller calculates the temperature-resistance property of the resistive heat generator based on the power and the change in the temperature that are obtained. The power controller adjusts a power duty cycle at which the power is supplied to the resistive heat generator in use of the resistive heat generator, based on the temperature-resistance property.

Abstract: An image forming apparatus includes a power supply board, a driver board, and an engine control board. The driver board includes a plurality of switching elements each configured to supply and shut off a power supply for each of a plurality of distributed power supply voltages supplied from the power supply board. The plurality of switching elements includes a first switching element, to which the power supply voltage is to be applied from the power supply board, and a second switching element, to which the power supply voltage output from the first switching element is to be applied in a distributed manner. The engine control board is configured to performs failure diagnosis of the first switching element when the image forming apparatus is activated, and performs failure diagnosis of the second switching element in a case where an abnormality has occurred in any one of a plurality of loads.

Abstract: A fixation apparatus includes an endless fixation belt, a pad portion, an opposing rotating body, a heat source, a tensioned support portion, a support portion, and an opposing portion. The tensioned support portion supports the fixation belt under tension. The support portion is arranged downstream from a fixation nip portion in a direction of rotation of the fixation belt, and supports the fixation belt from an inner circumferential side of the fixation belt. The opposing portion is arranged as being opposed to an outer circumferential surface of the fixation belt with a space being interposed. The support portion includes a contact area where the support portion and an inner circumferential surface of the fixation belt are in contact with each other. The opposing portion is arranged as being opposed to the contact area.

Abstract: Various methods for sensing and/or heating that utilize nanostructures or carbon structures, such as nanotubes, nanotube meshes, or graphene sheets, are disclosed. In some methods, at least a pair of contacts are electrically coupled with a given nanostructure or carbon structure to sense a change or to pass a current for heating.

Abstract: A heating device includes a heater including a heat generator that generates heat as the heat generator is supplied with power. A feeding member contacts the heater and feeds the power to the heat generator. An endless belt rotates and is heated by the heater. A driving roller contacts an outer circumferential surface of the endless belt. A driving force transmitter is disposed at one lateral end of the driving roller in an axial direction of the driving roller. The driving force transmitter transmits a driving force that drives and rotates the driving roller. The feeding member is made of a corson copper alloy and is disposed in a non-driving side defined by a center of the heat generator in a longitudinal direction of the heater. The non-driving side is opposite a driving side in the longitudinal direction of the heater, where the driving force transmitter is disposed.

Abstract: A heating device according to an embodiment generally includes heat generating parts and temperature sensors. The heat generating parts are divided into a plurality of blocks, so that the plurality of heat generating parts are arranged with a gap therebetween on a substrate in each block. With a temperature detection region provided in each block, the temperature sensors are provided corresponding to the heat generating parts with the gaps being avoided. The temperatures of the heat generating parts are detected by the temperature sensors that are less in number than the plurality of heat generating parts.

Abstract: An image forming apparatus includes a transfer portion to transfer a toner image to a sheet, a fixing portion to fix the toner image, a reverse conveyance portion to perform a reverse conveyance operation in which the sheet is conveyed to a first direction and thereafter conveyed to a second direction that is opposite to the first direction, and a reverse guide configured to guide the sheet in the reverse conveyance operation. A conveyance guide pair forms a conveyance path through which the sheet subjected to the reverse conveyance operation passes, and guides the sheet toward the transfer portion, and an air blowing portion blows air toward the conveyance path. In addition, a ventilation portion is provided through which air blowing from the air blowing portion toward the reverse guide passes, the air having passed through the ventilation portion flowing along the reverse guide.

Abstract: A heater including a rectangular substrate; a resistance heat-generating element that is provided on one surface of the substrate along a longitudinal direction of the substrate; a thermistor that is provided on the other surface, which is a rear side of the one surface of the substrate, and measures temperature of the substrate; and a conductor that is provided on the other surface of the substrate, is extended up to an end portion of the substrate from the thermistor along the longitudinal direction of the substrate, and supplies power to the thermistor. A first connecting portion and a second connecting portion, which are connected to the conductor, are provided at both ends of the thermistor. A connection direction, in which the first connecting portion and the second connecting portion are arranged on the other surface of the substrate, is different from a lateral direction of the substrate.

Abstract: The present subject matter describes a heating unit. The heating unit comprises a heating element and a controlling unit coupled to the heating element to determine a desired value of a direct current (DC) voltage based on heating element parameters. The desired value is a value of DC voltage desired for operation of the heating element. The controlling unit computes a value of a duty cycle parameter based on device input parameters and the desired value of the DC voltage. The heating unit further comprises a power factor correction (PFC) unit coupled to the controlling unit and the heating element to convert an input alternating current (AC) voltage, received by the PFC unit from an AC supply, to a direct current (DC) voltage of the desired value based on the duty cycle parameter. The PFC unit provides the DC voltage to the heating element.

Abstract: A fixing apparatus includes: a heating rotor having one or more rotational axis and including a heater; a fixing pad that is a non-rotor; a belt stretched around at least the heating rotor and the fixing pad; a pressure roller capable of sandwiching the belt in cooperation with the fixing pad; and a driving source that supplies rotational driving force to the heating rotor, in which the pressure roller is allowed to have a first mode and a second mode, the pressure roller being pressed against the fixing pad in the first mode, the pressure roller being separated from the fixing pad in the second mode, and the heating rotor is given rotational driving force from the driving source at both ends sandwiching the belt.

Abstract: A fixing device includes a fixing belt that is endless and rotates in a rotation direction. A pressure rotator presses against the fixing belt to form a nip between the fixing belt and the pressure rotator. A heater is disposed opposite an inner circumferential surface of the fixing belt and heats the fixing belt. A contact member contacts the fixing belt partially in a longitudinal direction of the fixing belt. A holder holds the heater. The heater contacts the holder with a first contact amount in a first span in a longitudinal direction of the heater, where the contact member contacts the fixing belt. The heater contacts the holder with a second contact amount, that is greater than the first contact amount, in a second span in the longitudinal direction of the heater, where the contact member does not contact the fixing belt.

Abstract: A drying apparatus includes a heating mechanism arranged so as to heat a medium supported by a support surface, an air sending path that includes an air intake port through which outside air is introduced and an air outlet port that opens to the support surface, and an air blower arranged so as to flow gas in the air sending path toward the air outlet port. The air sending path may include an inside layer that can suppress ventilation and a heat insulating layer that is arranged superimposed on an outside of the inside layer.

Abstract: A fixing member including a base, an elastic layer and a bonding layer is provided. The base contains a polyimide resin. The elastic layer is disposed on the base and contains silicone rubber. The bonding layer is disposed between the base and the elastic layer and is a cured product of a composition containing a siloxane polymer having a glycidyl group.

Abstract: A fixing device includes a belt, a roller, a heater, and a reflector. The belt is rotatable in a rotational direction. The roller is positioned to be in contact with an outer peripheral surface of the belt so as to form a nip between the roller and the belt. The heater is disposed within an inner circumference of the belt. The reflector is disposed within the inner circumference of the belt. The reflector includes a first portion and a second portion. The first portion is in contact with and protrudes outwardly the belt at a first region downstream with respect to the nip in the rotational direction. The second portion is configured to reflect heat generated by the heater toward an inner surface of the belt at a second region upstream with respect to the nip in the rotational direction.

Abstract: A sheet manufacturing apparatus has a heating/compressing unit configured to form a sheet by heating and compressing material including fiber and resin, and the heating/compressing unit includes a first rotating body that rotates, and a second rotating body that rotates in contact with the first rotating body. The sheet manufacturing apparatus holds, heats, and compresses material by the first rotating body and the second rotating body. The sheet manufacturing apparatus includes a heating unit that heats the outside surface of at least one of the first rotating body and second rotating body.

Abstract: A heating system includes a heater, a switch providing alternating current to the heater, and a current sensor electrically connected between the switch and the heater. The heating system also includes a controller that controls operation of the switch. The controller activates the switch during a portion of a half cycle of the alternating current having increasing amplitude under a threshold. The controller determines, based on a signal received from the current sensor during the activation of the switch, a time period from the start of the half cycle to a threshold timing at which the alternating current reaches the threshold. The controller reactivates the switch at a timing on or after a timing obtained by subtraction of the determined time period from an end of the half cycle. The heating system is useable within an image forming apparatus.

Abstract: In accordance with an embodiment, a fixing device comprises a fixing belt configured to heat a toner image on a sheet to which the toner image is attached to fix the toner image to the sheet using heat; a heating roller, arranged to internally contact the fixing belt to carry the fixing belt, configured to heat the fixing belt; and a plurality of support rollers each configured to abut against a portion that does not abut against the fixing belt at an end in a longitudinal direction of the heating roller to support the heating roller, and have an outer diameter smaller than that of the portion that does not abut against the fixing belt.

Abstract: Thermal methods and systems are described for the batch and/or continuous monitoring of films and/or membranes and/or electrodes produced in large-scale manufacturing lines. Some of the methods described include providing an energy input into a film, measuring a thermal response of the film, and correlating these to one or more physical properties and/or characteristics of the film.

Abstract: An image forming apparatus includes a device for forming a trace of an image fixing nip, primary transfer nip, secondary transfer nip or developing nip is formed, a detecting device for detecting a width of the nip from the trace of the nip, and a controller for controlling fixing, transferring, developing or image forming parameter in accordance with the nip width detected by the detecting device. Proper image forming conditions are provided against the change of the nip width.

Abstract: A heating device includes a belt that rotates in a rotation direction and has a temperature decrease span in an axial direction of the belt, where the belt is susceptible to temperature decrease. A resistive heat generator is disposed opposite the belt. The resistive heat generator heats the belt and extends in the axial direction of the belt. The resistive heat generator includes a primary heat generating portion that generates heat in a first heat generation amount and a secondary heat generating portion that is disposed outside the primary heat generating portion and disposed opposite the temperature decrease span of the belt. The secondary heat generating portion generates heat in a second heat generation amount that is greater than the first heat generation amount of the primary heat generating portion.