Abstract: A fusing device of which a lifespan may be increased by stably supplying a lubricant to a fusing belt, and an image forming apparatus including the same are provided.

Abstract: A fixing device includes a fixing belt, a flat heater, a holder and a pressing roller. The fixing belt is rotatable and cylindrical. The flat heater has a holding body and a heating resistor. The holder is configured to hold the flat heater such that a surface in which the heating resistor is embedded comes into contact with an inner circumferential face of the fixing belt via a lubricant. Of a contact area of the flat heater with the inner circumferential face of the fixing belt, in an area outside longitudinal end portion of the holding body, a groove is formed such that the lubricant flows to a center side of the holding body toward a downstream side in a rotational direction of the fixing belt.

Abstract: A fuser device for fusing a developer image on a medium by applying heat includes an endless fuser belt, a belt supporting part that has a contact face shaped in an arc centering on a first central axis and contacts with the inner circumferential face of the fuser belt on the contact face, a driven ring that is disposed on at least one side of the fuser belt in the width direction of the fuser belt, and a ring supporting part that has a contact face shaped in an arc centering on a second central axis and contacts with an inner circumferential face of the driven ring on the contact face, wherein the first central axis is shifted from the second central axis.

Abstract: Provided is a fixing belt that is used in a fixing device, the fixing device nipping, between a heated fixing belt and a roller, a recording material in which an unfixed toner image is formed on a surface, and fixing the toner image onto the recording material, and the fixing belt has a fixing temperature that causes a tipping point in a characteristic of a change in glossiness of the toner image that has been fixed with respect to a change in the fixing temperature.

Abstract: A belt-type transport device includes a belt, a pressure unit, a nip forming unit, a belt stretching roller, an inclination controller, a contact unit, and a support unit. The belt is an endless belt, has an outer circumferential surface and an inner circumferential surface, and is to be rotated. The pressure unit is in contact with the outer circumferential surface of the belt. The nip forming unit presses the belt against the pressure unit so as to form a nip through which a recording medium is to be transported. The belt stretching roller is disposed inside the belt and stretches the belt. The inclination controller controls inclination of the belt stretching roller. The contact unit is provided along a width direction of the belt and is in contact with the inner circumferential surface of the belt. The support unit supports the contact unit such that the contact unit is able to follow inclination of the belt which is changed due to the inclination of the belt stretching roller.

Abstract: A replacement endless belt for an image heating device for heating an image on a recording material includes an endless base layer; a parting layer provided on an outer peripheral surface of the base layer; and a lubricant applied on at least a circumferentially partial area of an inner surface, except for predetermined regions from opposite ends of the endless belt.

Abstract: A fixing apparatus includes a holding member including a groove-like holding portion, a heater supported by the holding portion, a film rotatable around the heater, the film being configured to be heated by sliding on the heater and to heat a toner image on a printing material, and a gap filling member including, on an upstream side with respect to the heater in a direction in which the circumferential surface of the film moves, a first portion disposed between the heater and the holding member and a first contact portion connecting to the first portion and being in contact with the film. A second distance between the first portion and the holding member disposed upstream from the first portion and facing the first portion is smaller than a first distance between the heater and the first portion disposed upstream from the heater and facing the holding member.

Abstract: A fixing device includes a rotatable endless fixing belt, a heat source, a heat radiation plate, and a power supply. The fixing belt is operable between a non-expanded state and a thermally expanded state. The heat source is disposed adjacent the fixing belt, to heat the fixing belt. The heat radiation plate is adjacent the fixing belt to contact the fixing belt when the fixing belt is in the thermally expanded state as a result of being heated by the heat source. The power supply shutoff member adjacent the fixing belt to shut off the supply of power to the heat source based on a state of the fixing belt.

Abstract: A fixing device includes an endless belt. A heat supply part is disposed inside the belt, contacts an inner circumferential surface thereof, and supplies heat thereto. A pressure member contacts an outer circumferential surface of the belt to form a nip portion, and conveys a recording medium while nipping the recording medium together with the belt. The heat supply part includes a heater having a plurality of heating sections arranged in a widthwise direction of the belt, and a thermal diffusion member extending in the widthwise direction between the heater and the belt. One surface of the thermal diffusion member contacts the inner circumferential surface of the belt, and the other surface contacts the heating sections. A plate thickness t (mm) between the surfaces of the thermal diffusion member, and a thermal diffusivity D (mm2/s) of the thermal diffusion member satisfy the relationship: t×D?6.7.

Abstract: While a stepping motor for conveying a paper is being driven, a first clocking section enables a counting control section to add a first predetermined value to a count value each time a first predetermined period of time elapses. When the count value reaches a first threshold value, a motor stop determination section stops the motor. A second clocking section enables the counting control section to subtract a second predetermined value from the count value each time a second predetermined period of time elapses when the motor is stopped. When the count value falls below a second threshold value smaller than the first threshold value, a motor drive resuming section resumes the operation of the motor. A third clocking section enables the counting control section to subtract a third predetermined value from the count value each time a third predetermined period of time elapses when the stepping motor is stopped in a state in which the count value is smaller than the first threshold value.

Abstract: An image fixing device including a cylindrical film, a heater, and a heat conduction member. The cylindrical film is contactable with toner unfixed on a sheet. The heater includes a substrate and a heat generating resistor provided on the substrate. The heat conduction member has a thermal conductivity higher than that of the substrate and is on a side of the substrate opposite from the heat generating resistor. The substrate is provided with non-insulating wiring patterns on a side opposite from the side provided with the heat generating resistor with respect to a direction perpendicular to a recording material feeding direction. The heat conduction member is in contact with one of the wiring patterns and is in contact with the substrate from a position of the substrate outside of an end of the heat generating resistor toward a central portion.

Abstract: A pressure-applying device includes a pressure-applying portion that applies pressure to a pressure-receiving object and a pressing portion that presses the pressure-applying portion toward the pressure-receiving object, the pressing portion having a hardness higher than a hardness of the pressure-applying portion. The pressure-applying portion includes plural projections that project from a back surface of the pressure-applying portion that faces the pressing portion toward a pressing surface of the pressing portion that faces the pressure-applying portion.

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 fixing member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer has transverse microhardness values within the range of 85 to 89, inclusive, and a transverse filtered maximum waviness (Wcm) of 0.1 ?m or more and 4 ?m or less.

Abstract: A fixing device including a heated endless belt, a first member, a second member, a pressure roller, a guide member, a sliding member, and a lubricant application member. The first member is a non-rotating body inside of the belt and together with the second member tensions the belt. The pressure roller is outside the belt and presses against the first member via the belt, thereby forming the fixing nip. The guide member is inside of the belt and has a guide surface that guides the belt in circulation and a recess opening into the guide surface. The sliding member is between the belt and the first member. The lubricant application member is fitted in the recess and applies lubricant to the belt. The guide surface has an arc shape that is interrupted by the recess in a cross section perpendicular to an axis of rotation of the pressure roller.

Abstract: According to one embodiment, an image forming apparatus includes a fixing member, a pressurizing member, a movable member, and a controller. The fixing member heats a sheet. The pressurizing member has first heat capacity and faces the fixing member. The movable member is provided to be movable between a contact position to contact with the pressurizing member and a separation position to be separated from the pressurizing member, and has second heat capacity smaller than the first heat capacity. The controller is configured to move the movable member to one of the contact position and the separation position based on a change of a control temperature of the fixing member or the pressurizing member.

Abstract: According to one embodiment, a fixing device fixes a toner image formed on a medium to the medium. The fixing device includes a heating rotator which is rotatably supported, an auxiliary heating member which is disposed along an inner circumferential surface of the heating rotator, and swings as the heating rotator rotates, a lubricant supply member which is disposed at a position on which the swing auxiliary heating member abuts, and is impregnated with a lubricant, and a pressing rotator which abuts on the heating rotator, and forms a nip portion through which the medium passes.

Abstract: A fixing device comprising a fixing belt, a rotating member to be in engagement with an outer circumferential surface of the fixing belt, to form a fixing nip between the fixing belt and the rotating member, and sliding members on both ends of the fixing belt.

Abstract: A fixing device includes a fixing belt, a pressing member, a pressing roller and a cap. The fixing belt is cylindrical and rotatable. The pressing member has a longitudinal length shorter than a longitudinal length of the fixing belt. The pressing member is configured to face an inner circumferential face of the fixing belt via a lubricant. The cap is configured to rotate together with the fixing belt. In a first end area between the longitudinal end portion of the fixing belt and the pressing member, a first step is formed on the inner circumferential face of the fixing belt in a circumferential direction of the fixing belt such that an inner diameter of the fixing belt is larger at a side of the longitudinal end than at a side of the pressing member.

Abstract: A fixing device for fixing a toner image on a paper sheet by conveying the paper sheet on which the toner image has been formed while holding the paper sheet at a fixing nip, the fixing device includes an endless belt that rotates, a pressing member that presses the belt from the inner side, a pressure member that forms the fixing nip between the pressure member and the belt by pressing, from the outer side of the belt, a portion of the belt pressed by the pressing member, and a hardware processor that controls glossiness of the toner image formed on the paper sheet by changing a shear force to be applied to the toner image formed on the paper sheet within a predetermined range from a nip inlet that is an end of the fixing nip, located upstream in a direction in which the paper sheet is conveyed.

Abstract: An image heating apparatus includes a fixing member, a pressing member, a fan, and a controller. When a mixed job including a first image forming step for continuously forming images on recording materials having a first basis weight and including a second image forming step, subsequent to the first image forming step, for continuously forming the images on recording materials having a second basis weight is executed, the controller switches, before a final recording material in the first image forming step completely passes through the nip, the operation of the fan to an operation of the fan for making a temperature of the pressing member higher than the temperature of the pressing member when the images are formed on the recording materials having the first basis weight.

Abstract: There is provided a fuser including: an endless belt; a contacting member contacting an outer peripheral surface of the endless belt; a pressure roller contacting an inner peripheral surface of the endless belt and sandwiching the endless belt together with the contacting member; and a sliding contact member making sliding contact with the inner peripheral surface of the endless belt. The pressure roller includes a first porous layer impregnated with a lubricating agent, in a place contacting the inner peripheral surface of the endless belt.

Abstract: According to one embodiment, a fixing device includes a heating rotating body having an first arched portion so that a first circular arc is formed in a cross section configured to rotate to be pressed against a medium so as to heat toner on the medium and an auxiliary heat-generating member having a second arched portion so that a second circular arc is formed in the cross section, the second arched portion being smaller than the first arched portion, configured to be supported at one end by a support member so as to be movable inside the heating rotating body and configured to contact with the first arced portion of the heating rotating body, the contact portion between the first arched portion and the second arched portion being closer to the support member than a middle point of the second circular arc in the cross section.

Abstract: There is provided a heater according to an embodiment including a heat generating unit configured to generate heat by electric conduction; and a plurality of electrodes configured to be respectively disposed at facing side edges of the heat generating unit so as to be electrically connected to the heat generating unit and at least one side of the side edges is formed by cutting out a part thereof.

Abstract: A fixing device includes an endless belt; a pressing unit that is in contact with an outer peripheral surface of the belt and that rotates the belt; a first unit that is provided on an inner peripheral surface of the belt and that retains the belt in contact with the pressing unit; a second unit provided on the inner peripheral surface of the belt and located downstream of the first unit in a rotation direction of the belt, the second unit applying tension to the belt and including a portion that is in contact with a central portion of the belt in a width direction of the belt and that is farther in a direction toward the outer peripheral surface of the belt than both ends of the belt in the width direction of the belt; and a third unit provided on the inner peripheral surface of the belt and located downstream of the second unit in the rotation direction of the belt, the third unit applying tension to the belt and including a portion that is in contact with the central portion of the belt in the width direct

Abstract: In a fixing device, a pressure roller is in contact with a fixing belt to form a fixing nip part with the fixing belt, a heating member heats the fixing belt when electrodes are energized, and a holding member holds the heating member. A connector in the fixing device includes a contact terminal that is in contact with the electrode, and by being mounted at a predetermined position of the holding member, the electrode and the contact terminal are in contact with each other. The holding member includes: a guide part having an inclined surface which is inclined with respect to a predetermined direction; and a positioning part that sets the position of the connector, inserted while being in contact with the inclined surface, in a rotatable state toward the predetermined position. The contact terminal is in contact with the electrode over a period before and after rotation of the connector.

Abstract: A fixing device includes a flexible rotating fixing belt, a pressing member, a heating part, a guide member and a contact force changing part. The pressing member forms a pressing area with the fixing belt. The heating part heats the fixing belt from an outside of the fixing belt. The guide member comes into contact with an inner circumferential face of the fixing belt to support the fixing belt so as to face the heating part. The contact force changing part moves the guide member in directions close to or away from the fixing belt to change a contact force between the guide member and the fixing belt depending on a pressure of the pressing area.

Abstract: An image heating apparatus includes an endless belt, a rotary member configured to form a nip portion with the endless belt, regulating members for regulating the endless belt from moving in a longitudinal direction by being in contact with longitudinal ends of the endless belt, and a sheet-like heating member. The heating member includes a heat transfer member in contact with the inner surface of the endless belt, and a heating portion located on an opposite side from a side, of the heating member, in contact with the inner surface of the endless belt across the heat transfer member. Both end portions of the heat transfer member are disposed at the same location or outside of both end portions of the heating portion in the longitudinal direction and are disposed inside of both end portions of the rotary member in the longitudinal direction.

Abstract: A fixing apparatus includes a first pressing roller, a belt wound around the first pressing roller, a second pressing roller, and a roller position changer that changes a position of the second pressing roller. The second pressing roller faces the first pressing roller across the belt and forms a fixing nip portion between itself and the belt. At least one of the first pressing roller and the second pressing roller includes a core metal and a foam body covering the core metal. The roller position changer changes a position of the second pressing roller based on a kind of print medium to change a peak surface pressure of the fixing nip portion, such that a range where maximum shearing strain occurs from an interface between the core metal and the foam body in the foam body is a predetermined range.

Abstract: A fixing device includes a circulating endless belt, a fixing unit that is in contact with the belt to form a fixing nip, a heat source provided on an inner side of the belt or on an inner side of the fixing unit, a pressurizing unit arranged on the inner side of the belt to pressurize the belt against the fixing unit, a sheet interposed between the belt and the pressurizing unit to reduce a sliding resistance, and a restricting unit that restricts movement of the sheet in a direction opposite to a moving direction of the belt at a position near a downstream side of the pressurizing unit in the moving direction of the belt.

Abstract: A heater includes a substrate, a heating resistor layer, and an electrode layer. The substrate has a substrate obverse surface and a substrate reverse surface. The heating resistor layer is formed on the substrate obverse surface. The electrode layer is formed on the substrate obverse surface and in contact with the heating resistor layer. The electrode layer includes a pair of strip portions extending in a longitudinal direction of the substrate and spaced apart from each other in the width direction of the substrate. The heating resistor layer includes a main heating member and a sub heating member each extending in the longitudinal direction of the substrate and located between the strip portions in the width direction. The sub heating member has a higher temperature coefficient of resistance than that of the main heating member.

Abstract: The fixing device includes an endless fixing belt, a pressing member, a pressing rotator, and a heating unit. The pressing member includes a counter face that faces the inner peripheral surface of the fixing belt. The counter face includes a curved portion that is concavely curved and an extended portion. The shape of the curved portion in a cross section orthogonal to the width direction of the fixing belt is configured to approach the center of the pressing rotator as it extends toward the downstream in the conveying direction. The extended portion is continuous with the curved portion and is provided at the downstream of the curved portion in the conveying direction of the recording medium. The shape of the extended portion in the cross section is configured to leave away from the center of the pressing rotator as it extends toward the downstream in the conveying direction.

Abstract: A fixing device fixes a toner image to a paper sheet, and the fixing device includes: a pressure roller; and a heating member, wherein the heating member includes: a pressure pad; a heating roller including a heater; and a fixing belt, the fixing device further includes a drive mechanism that controls rotation of the pressure roller and the heating roller, the fixing belt is driven while sliding on a surface of the pressure pad, when the heating roller rotates, and the drive mechanism applies pressure to the paper sheet, fixes the toner image to the paper sheet, switches between a contact state in which the pressure roller and the fixing belt are in contact with each other, and a separated state in which the pressure roller and the fixing belt are separated from each other, and switches to the contact state when a predetermined condition is satisfied.

Abstract: There is provided a fuser including: a cylindrical member; an endless belt; a pressing member; a pressing roller; and a lateral guide contacting a lateral end of the endless belt. A part of an outer circumferential surface of the pressing roller is located on a downstream of the second nip area in a first direction. A guide surface of the lateral guide has: a first guide surface located on an opposite side to the pressing roller with respect to a virtual plane including the center of a first nip area and the center of rotation of the cylindrical member, and a second guide surface located on a side of the pressing roller with respect to the virtual plane, located on the downstream side of the rotation axis of the pressing roller in the first direction, and arranged on a same plane as the first guide surface.

Abstract: An image forming apparatus includes an image forming portion configured to form a toner image on a recording material, a fixing portion configured to heat and to fix the toner image formed on the recording material, and a controller configured to control the apparatus, which is operable to form an image on a recording material having a first size and a recording material having a second size smaller than the first size in a direction perpendicular to a recording material feeding direction. If a printing instruction for printing on the recording material of the first size is received while continuously printing on the recording material of the second size at a first throughput, the controller controls the apparatus so as to print on the recording material of the second size at a second throughput, lower than the first throughput, before printing on the recording material of the first size.

Abstract: A fixing device includes a belt, a heater, and a pressing member for forming a nip through the belt in cooperation with the heater. The nip includes a region at which a width of the nip with respect to a feeding direction of a recording material gradually increases from a longitudinal central portion toward a longitudinal end portion, and a pressure of the nip gradually increases from the longitudinal central portion toward the longitudinal end portion. A heat-conductive member includes a regulating portion for regulating movement thereof relative to a supporting member in a longitudinal direction of the heater. The regulating portion is provided in a region of the heat-conductive member corresponding to a position of the nip closer to the longitudinal end portion than to the longitudinal central portion, and a bias member is provided outside of the region of the heat-conductive member corresponding to the position of the nip.

Abstract: A fixing apparatus includes a fixing belt and an induced current generation section. The fixing belt includes a conductive layer. The induced current generation section faces the fixing belt. The induced current generation section includes a coil and a magnetic body. The coil generates a magnetic flux. The magnetic body faces the fixing belt across the coil. In the magnetic body, a part facing an end in a width direction of the fixing belt is set as a movable magnetic body capable of moving in a width direction.

Abstract: According to one embodiment, a fixing device includes a circulating member for fixing, a pressure member, a heater, a reflector, a heat storage section, and a driving device. The circulating member for fixing includes an annular peripheral wall circularly movable. The pressure member is arranged to face an outer peripheral surface of the circulating member for fixing and forms a nip with the circulating member for fixing. The heater is arranged inside the circulating member for fixing and heats the circulating member for fixing. The reflector is arranged inside the circulating member for fixing and reflects radiant heat of the heater to the circulating member for fixing. The heat storage section is provided integrally with the reflector or connected to the reflector. The driving device causes the heat storage section to abut on or separate from an inner peripheral surface of the circulating member for fixing.

Abstract: A fusing device includes a driving roller and a fusing unit including a heat insulating component, a heat generating component, a heat conducting component connected to the heat insulating component, a heat reflecting component, a metal reinforcing component and a fusing component. The heat generating component and the heat reflecting component are located inside the heat insulating component. The metal reinforcing component is located outside the heat insulating component and separated from the heat conducting component. The fusing component movably surrounds the heat conducting component, the heat insulating component and the metal reinforcing component. The heat reflecting component reflects heat generated from the heat generating component to the heat conducting component. The heat conducting component conducts the heat to the fusing component. The fusing component contacts with a printing media to fuse toners onto the printing media by heating when the driving roller drives the printing media to move.

Abstract: A fixing device fixes a toner image onto a piece of paper by conveying the piece of paper formed with the toner image while nipping the piece of paper at a fixing nip, and includes: an endless belt that is rotated; a pressing member that presses the belt; a support member that supports the pressing member; a sheet wound around the pressing member along the conveyance direction; and a pressurizing member that forms the fixing nip with the belt, wherein a part of an upstream region of the sheet existing more on an upstream side in a winding direction than a contact region contacting the belt and the pressing member and a part of a downstream region of the sheet existing more on a downstream side in the winding direction than the contact region are interposed between the pressing member and the support member, and are fixed by pressing force.

Abstract: In a fixing device of the present invention, first and second movable members are each urged toward a flexible member so that the contact between contact surfaces of the first and second movable members and end faces of the flexible member are each maintained.

Abstract: A fixing device according an embodiment includes a belt unit and a pressure member. The belt unit includes a supporter, an endless belt movably supported by the supporter, a heater provided inside the endless belt, and a thermal diffusion member including: a first surface in contact with the heater; a second surface in contact with an inner surface of the endless belt; a first wall provided upstream of the heater in a transport direction of a medium; and a second wall provided downstream of the heater in the transport direction. The supporter includes first and second grooves in which the first and second walls are provided respectively. Upon applying a pressing force toward the supporter to the outer surface of the endless belt by the pressure member, the thermal diffusion member and the heater are in contact with each other while being pressed toward a contact surface of the supporter.

Abstract: A fixing device includes a first pressing member that is heated and that presses a recording medium moving along a recording medium transport path; a second pressing member that is disposed opposite the first pressing member across the recording medium transport path and presses the recording medium, the second pressing member including an opposing portion opposing the first pressing member, the opposing portion having, at a part, a pressed portion pressed against the first pressing member; and a heat receiver that is disposed to oppose an upstream portion of the opposing portion, the upstream portion of the opposing portion being located upstream of the pressed portion in a direction in which the recording medium moves, the heat receiver being disposed upstream of the recording medium transport path and receiving heat from the first pressing member.

Abstract: A fixing device includes a belt having a cylindrical shape, a roller, a heater, and a reflector. 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 the belt. The reflector is disposed within the inner circumference the belt and in contact with the belt and configured to reflect heat generated by the heater toward an inner surface of the belt.

Abstract: A fixing apparatus that fixes an image onto a recording material includes: a belt, a nip plate contacting an inner surface of the belt, a roller configured to form a nip portion with the nip plate, a supporting member supporting the nip plate, the supporting member having a cross section in a shape of U, and supporting, with two legs, a surface of the nip plate opposite to a surface contacting the belt, and a guide member disposed on an upstream side of the nip plate and including a guide portion, wherein the recording material on which the image is formed is heated while being conveyed through the nip portion, and the image is fixed onto the recording material, and the guide member is supported by a first surface and a second surface of an upstream side leg among the two legs of the supporting member.

Abstract: A fixing apparatus includes a tubular film, an elongate heater, a roller, and a lubricant interposed between the heater and the film. A temperature detecting member detects a temperature of the heater, a controller controls electrical power supplied to the heater so that a temperature detected by the temperature detecting member reaches a target temperature, and a guide member guides the film. The guide member has a plurality of protrusions protruding toward the inner surface of the film. In a longitudinal direction of the guide member, a first region of the guide member corresponds to the temperature detecting member, and a second region of the guide member does not correspond to the temperature detecting member. In addition, a width of one protrusion located at the first region is greater than a width of some of the plurality protrusions located at the second region.

Abstract: A fixing device includes an endless belt member that rotates, and includes a first end on one side in an axial direction and a second end on the other side in the axial direction; a belt support that comes into contact with part of an inner circumferential surface of the belt member to support an inner side of the belt member; a guide portion disposed on the inner side of the belt member at at least one of the first and second ends of the belt member to guide the belt member moving in a circumferential direction; and a protruding portion disposed at a position in the circumferential direction of the belt member different from a position in the circumferential direction at which the belt support is disposed, the protruding portion protruding from the guide portion toward the other one of the first and second ends of the belt member.

Abstract: A fixing device includes a heating member, a pressing member and a separating member. The heating member heats a toner transferred on a sheet. The pressing member forms a pressing area with the heating member. The toner is pressed at the pressing area. The separating member comes into contact with an outer circumferential face of the heating member and separates the sheet passed through the pressing area from the heating member. The heating member has a contact area with which the separating member comes into contact and a non-contact area with which the separating member does not come into contact. The heating member has a larger outer diameter at the contact area than an outer diameter at the non-contact area.

Abstract: This heat fixing belt is provided with a tubular belt base that is formed from an insulating heat-resistant resin, an elastic resistive heat generation layer that is formed from an elastic base material containing an elastic material and contains conductive material, a toner release layer, and a pair of electrode layers for feeding a power to the elastic resistive heat generation layer. The elastic resistive heat generation layer is provided on the outer circumferential surface of the belt base. The toner release layer is provided as the outermost layer. The pair of electrode layers are provided on both end portions of the outer circumferential surface of the elastic resistive heat generation layer, and have a volume resistivity that is lower than the volume resistivity of the elastic resistive heat generation layer.

Abstract: A fixing device includes a frame, a film, a component portion engaging with the frame, and a roller that forms a nip with the film. The component portion includes a supporting portion provided inside the film, and including a first opposing surface opposing an inner surface of the film, and a second opposing surface opposing the inner surface of the film. Each of the first opposing surface and the second opposing surface is a surface forming a substantially right angle with an engaging surface, which is a surface on which the component portion engages with the frame and on which the component portion opposes a flat surface portion of the frame. When the component portion is seen in the longitudinal direction of the film, a contour of the first opposing surface is greater than a contour of the second opposing surface.