Abstract: A fixing device includes a cylindrical rotatable fixing belt, a flat heater, a heater holding part, a pressuring member, and a connector. In the flat heater, an electrode part, a feeder and a heat generating part are formed in the same face state. The heater holding part holds the flat heater so that the heat generating part faces to an inner circumference face of the fixing belt. The pressuring member sandwiches the fixing belt with the flat heater. The connector has a contacting portion coming into contact with the electrode part. The feeder has a portion arranged at a near side from the electrode part in an attaching direction of the connector. The heater holding part includes a protecting portion covering the portion of the feeder arranged at the near side from the electrode part.

Abstract: A fixing device includes a cylindrical rotatable fixing belt, a flat heater, a safety device, a heater holding part and a pressuring member. The flat heater has a plurality of heat generating parts. The safety device is arranged across two adjacent heat generating parts to interrupt power supply to the heat generating parts in a case where temperature reaches a threshold value. The heater holding part holds the flat heater so that the flat heater comes into contact with an inner circumference face of the fixing belt. The pressuring member sandwiches the fixing belt with the flat heater to form a pressuring area for sandwiching and conveying a sheet between the fixing belt and the pressuring roller.

Abstract: A fixing device includes a cylindrical rotatable fixing belt, a flat heater, a heater holding part, a pressuring member, and a connector. In the flat heater, an electrode part, a feeder and a heat generating part are formed in the same face state. The heater holding part holds the flat heater so that the heat generating part faces to an inner circumference face of the fixing belt. The pressuring member sandwiches the fixing belt with the flat heater. The connector has a contacting portion coming into contact with the electrode part. The feeder has a portion arranged at a near side from the electrode part in an attaching direction of the connector. The heater holding part includes a protecting portion covering the portion of the feeder arranged at the near side from the electrode part.

Abstract: A heating unit includes a circuit board, a plurality of heating parts, and a plurality of wiring parts. The heating parts are arranged in a first direction on a surface of the circuit board. The wiring parts are provided on the surface of the circuit board and electrically connect the heating parts and a power source to feed the heating parts. The wiring parts respectively include electrode terminal parts electrically connected to the power source outside the heating parts in the first direction. Sizes in a second direction orthogonal to the first direction of the heating parts are set to decrease gradually or stepwisely with separating in the first direction from the electrode terminal parts.

Abstract: A heating unit includes a circuit board, heating parts, and electrode parts. The heating parts are arranged in a first direction on a surface of the circuit board. The electrode parts are disposed on the surface of the circuit board, and electrically connected to both sides of the heating parts in a second direction that is orthogonal to the first direction. Each of the heating parts includes a plurality of heating resistors that is arranged in the first direction. Each of the heating resistors has a size ratio of a first length in the second direction to a second length in the first direction is 1 or more and 100 or less.

Abstract: A heating unit includes a circuit board, a plurality of heating parts, and a plurality of wiring parts. The heating parts are arranged in a first direction on a surface of the circuit board. The wiring parts are provided on the surface of the circuit board and electrically connect the heating parts and a power source to feed the heating parts. The wiring parts respectively include electrode terminal parts electrically connected to the power source outside the heating parts in the first direction. Sizes in a second direction orthogonal to the first direction of the heating parts are set to decrease gradually or stepwisely with separating in the first direction from the electrode terminal parts.

Abstract: A heating unit includes a circuit board, heating parts, and electrode parts. The heating parts are arranged in a first direction on a surface of the circuit board. The electrode parts are disposed on the surface of the circuit board, and electrically connected to both sides of the heating parts in a second direction that is orthogonal to the first direction. Each of the heating parts includes a plurality of heating resistors that is arranged in the first direction. Each of the heating resistors has a size ratio of a first length in the second direction to a second length in the first direction is 1 or more and 100 or less.

Abstract: The fixing device includes a fixing member, a pressing member, and a heat source. The fixing member heats toner on a medium. The pressing member forms a pressing area with the fixing member and presses the toner. The heat source is provided corresponding to the pressing area across the fixing member and heats the fixing member. The heat source includes a heat insulation layer and a heating and contacting part. The heat insulation layer is laminated on a base material and has a convex part that protrudes toward the fixing member. The heating and contacting part is laminated on the heat insulation layer that has the convex part and contacts to an inner surface of the fixing member so as to heat the fixing member. The convex part protrudes the heating and contacting part laminated thereon toward the fixing member so as to maximize pressure in the pressing area.

Abstract: A fixing device includes a fixing belt, a pressuring roller pressured to the fixing belt, a heat source heating the fixing belt, a pressing member pressing the fixing belt toward the pressuring roller's side, and a sliding contact sheet interposed between the fixing belt and the pressing member to hold lubricant. The sliding contact sheet includes a sliding contact portion arranged at the center in a sheet conveying direction to come into contact with the fixing belt, a first fixed portion arranged at an upstream side in the conveying direction and wound around the pressing member at the heat source's side, and a second fixed portion arranged at a downstream side in the conveying direction and wound around the pressing member at the heat source's side from the first fixed portion. The sliding contact sheet is configured so that the second fixed portion becomes smaller than the first fixed portion.

Abstract: A fixing device includes a heating belt, a heat source, a pressuring body, a pressing member and a sheet member. The heating belt is endless and heats a medium while being circulated. The heat source supplies heat to the heating belt. The pressuring body forms a nip with the heating belt, rotates so as to circulate the heating belt and presses the medium with the heating belt. The pressing member is disposed inside the heating belt and presses the heating belt against the pressuring body at the nip. The sheet member is held between the heating belt and the pressing member, attached to the pressing member at a center side portion and both end side portions in a longitudinal direction of the sheet member and has a heat shrinkable property. The both end side portions are shiftable in the longitudinal direction greater than the center side portion.

Abstract: A fixing device includes a heating belt, a heat source, a pressuring body, a pressing member and a sheet member. The heating belt is endless and heats a medium while being circulated. The heat source supplies heat to the heating belt. The pressuring body forms a nip with the heating belt, rotates so as to circulate the heating belt and presses the medium with the heating belt. The pressing member is disposed inside the heating belt and presses the heating belt against the pressuring body at the nip. The sheet member is held between the heating belt and the pressing member, attached to the pressing member at a center side portion and both end side portions in a longitudinal direction of the sheet member and has a heat shrinkable property. The both end side portions are shiftable in the longitudinal direction greater than the center side portion.

Abstract: A fixing device includes a fixing belt, a pressuring roller pressured to the fixing belt, a heat source heating the fixing belt, a pressing member pressing the fixing belt toward the pressuring roller's side, and a sliding contact sheet interposed between the fixing belt and the pressing member to hold lubricant. The sliding contact sheet includes a sliding contact portion arranged at the center in a sheet conveying direction to come into contact with the fixing belt, a first fixed portion arranged at an upstream side in the conveying direction and wound around the pressing member at the heat source's side, and a second fixed portion arranged at a downstream side in the conveying direction and wound around the pressing member at the heat source's side from the first fixed portion. The sliding contact sheet is configured so that the second fixed portion becomes smaller than the first fixed portion.

Abstract: A fixing device includes a heating body, a pressuring body, a temperature detecting part, a first frame supporting the heating body, a second frame supporting the pressuring body and a moving mechanism. The temperature detecting part has a detecting element detecting an infrared ray radiated from the heating body and detects temperature of the heating body by the detecting element. The first frame includes a heat interrupting member covering the heating body between the heating body and the temperature detecting part. The moving mechanism moves the first frame in an approaching direction or a separating direction from the second frame to establish the heating body and the pressuring body in a pressurization state or a depressurization state. The heat interrupting member includes an aperture elongated in a movement direction of the first frame to pass the infrared ray radiated from the heating body to the detecting element through the aperture.

Abstract: A fixing device includes a fixing belt rotatably located around a rotation axis, a pressure member rotatably located, and a pressing member. The pressure member is brought into pressure contact with the fixing belt to form a fixing nip. The pressing member includes a pressing surface that presses the fixing belt toward a side of the pressure member. The pressing surface includes a plane surface portion extending along a conveyance direction of a recording medium, and a curved surface portion located at a downstream side of the plane surface portion in the conveyance direction of the recording medium. The curved surface portion is curved along an outer peripheral surface of the pressure member. The curved surface portion has a curvature radius larger than a curvature radius of the outer peripheral surface of the pressure member before a deformation in association with a formation of the fixing nip.

Abstract: Provided is a fixing device including a pair of end deformation restraint members. A restraint body 35 of the end deformation restraint member has an insertion part 38 which is inserted into both end portions of a fixing belt, and restrains deformation of belt end portions by holding both end portions of the fixing belt, which slides on an outer peripheral surface of the insertion part 38, from inside in the insertion part 38. The insertion part 38 is continued in a belt rotation direction with no gap.

Abstract: A fixing device includes a fixing belt, a pressuring member, a pressing member, a shape restricting member and an elastic body. The fixing belt is configured to be rotatable. The pressuring member is configured to be rotatable and to come into pressure contact with the fixing belt so as to form a fixing nip. The pressing member is configured to press the fixing belt to a side of the pressuring member. The shape restricting member is configured to restrict a shape of the fixing belt and having an arc-shaped insertion part to be inserted into an end part of the fixing belt. The elastic body is attached to an end part in a circumferential direction of the insertion part.

Abstract: A fixing device includes a fixing belt rotatably located around a rotation axis, a pressure member rotatably located, and a pressing member. The pressure member is brought into pressure contact with the fixing belt to form a fixing nip. The pressing member includes a pressing surface that presses the fixing belt toward a side of the pressure member. The pressing surface includes a plane surface portion extending along a conveyance direction of a recording medium, and a curved surface portion located at a downstream side of the plane surface portion in the conveyance direction of the recording medium. The curved surface portion is curved along an outer peripheral surface of the pressure member. The curved surface portion has a curvature radius larger than a curvature radius of the outer peripheral surface of the pressure member before a deformation in association with a formation of the fixing nip.

Abstract: A fixing device includes a heating body, a pressuring body, a temperature detecting part, a first frame supporting the heating body, a second frame supporting the pressuring body and a movement mechanism. The temperature detecting part has a detecting element detecting an infrared ray radiated from the heating body and detects temperature of the heating body by the detecting element. The first frame includes a heat interrupting member covering the heating body between the heating body and the temperature detecting part. The movement mechanism moves the first frame in an approaching direction or a separating direction from the second frame to establish the heating body and the pressuring body in a pressurization state or a depressurization state. The heat interrupting member includes an aperture elongated in a movement direction of the first frame to pass the infrared ray radiated from the heating body to the detecting element through the aperture.

Abstract: A fixing device includes a heating body heated by a heat source, a pressuring body, a conversion temperature detecting part, a substrate temperature detecting part, a lens temperature detecting part, a conversion temperature correcting part and a controller. The conversion temperature detecting part has an infrared ray detecting element mounted to a substrate detecting an infrared ray from the heating body and a lens optically focusing the infrared ray onto the infrared ray detecting element. The conversion temperature detecting part detects conversion temperature of surface temperature of the heating body with detection result of the infrared ray detecting element. The substrate temperature detecting part detects substrate temperature. The lens temperature detecting part detects lens temperature. The conversion temperature correcting part corrects the conversion temperature with the substrate temperature and the lens temperature.

Abstract: Provided is a fixing device including a pair of end deformation restraint members. A restraint body 35 of the end deformation restraint member has an insertion part 38 which is inserted into both end portions of a fixing belt, and restrains deformation of belt end portions by holding both end portions of the fixing belt, which slides on an outer peripheral surface of the insertion part 38, from inside in the insertion part 38. The insertion part 38 is continued in a belt rotation direction with no gap.