Abstract: A fixing device is provided with a rotatable fixing member, a pressure roller for holding and conveying a sheet between the pressure roller and the fixing member, a driving unit for driving the pressure roller or the fixing member, a heating unit for heating the fixing member, and a control unit for receiving an instruction for designating any of a first mode in which a temperature of the fixing member is raised at a first temperature raising speed and a second mode in which a temperature of the fixing member is raised at a second temperature raising speed slower than the first temperature raising speed to reduce a generation amount of ultrafine particles compared with the first mode, and controlling the driving unit or the heating unit so as to raise the temperature of the fixing member to a first temperature at a temperature raising speed corresponding to the instruction.

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.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source and a reflecting member. The fixing belt is arranged rotatably around a rotation axis. The reflecting member reflects the radiant heat radiated from the heat source. The fixing belt has a passing region and a non-passing region. Through the passing region, a recording medium passes. The non-passing region is arranged outside the passing region in a direction of the rotation axis. The reflecting member has a first reflecting part and a second reflecting part. The first reflecting part is arranged at an inner circumferential side of the passing region. The second reflecting part is arranged at an inner circumferential side of the non-passing region. Roughness of a face at the heat source side of the second reflecting part is larger than roughness of a face at the heat source side of the first reflecting part.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source, a pressing member, a temperature sensor and a controller. A detected region whose temperature is detected by the temperature sensor is formed in the fixing belt, and an elastic layer of the detected region is provided with a hole in a part thereof in a circumferential direction. The controller judges that the fixing belt is rotating in a case where the temperature detected by the temperature sensor alternately increases and decreases in a state that the heat source is heating the fixing belt, and judges that the fixing belt is not rotating in a case where the temperature detected by the temperature sensor does not alternately increase and decrease in the state that the heat source is heating the fixing belt.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source, a pressing member, a heating stop device and a deformation preventing member. The deformation preventing member is configured to face an inner circumferential face of the fixing belt. In a state where the fixing belt is not broken in a circumferential direction, the fixing belt and the deformation preventing member are arranged at an interval, and when the fixing belt is broken in the circumferential direction, the fixing belt is deformed and comes into contact with the deformation preventing member so that the fixing belt is prevented from being deformed to a side far from the heating stop device.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source, a pressing member and a first heating stop device. The fixing belt is provided to be rotatable around a rotation axis. 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 heat source is arranged at an inner diameter side of the fixing belt, provided at a position displaced from the rotation axis and configured to heat the fixing belt. The pressing member is configured to press the fixing belt to a side of the pressuring member. The first heating stop device is configured to face an outer circumferential face of a closest part to the heat source of the fixing belt and to operate at a first operating temperature so as to stop the heat source from heating the fixing belt.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source, a pressing member, a temperature sensor and a controller. A detected region whose temperature is detected by the temperature sensor is formed in the fixing belt, and an elastic layer of the detected region is provided with a hole in a part thereof in a circumferential direction. The controller judges that the fixing belt is rotating in a case where the temperature detected by the temperature sensor alternately increases and decreases in a state that the heat source is heating the fixing belt, and judges that the fixing belt is not rotating in a case where the temperature detected by the temperature sensor does not alternately increase and decrease in the state that the heat source is heating the fixing belt.

Abstract: A fixing device fixing an image on a recording medium includes a fixing belt rotatable around a first rotation axis, a pressuring member, a heat source body and a cover member. The pressuring member forms a nip part pressuring and making the recording medium pass through with the fixing belt. The heat source body is arranged inside the fixing belt and heats the fixing belt by emitting radiant heat. The cover member is arranged between the fixing belt and the heat source body and covers the heat source body. The nip part has a passing area where the recording medium passes through and a non-passing area outside the passing area in an axial direction. The cover member covers a part of the heat source body corresponding to the non-passing area and includes through holes formed so as to adjust surface temperature of the heat source body.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source, a pressing member, a heating stop device, shape restricting members and biasing members. The fixing belt is provided to be rotatable around a rotation axis. The pressing member is provided to be rotatable and to come into pressure contact with the fixing belt so as to form a fixing nip. The heat source heats the fixing belt. The pressing member presses the fixing belt to a side of the pressuring member. The heating stop device faces an outer circumferential face of the fixing belt and to operate at an operating temperature so as to stop the heat source from heating the fixing belt. The shape restricting members are attached to both end parts of the fixing belt and restricts a shape of the fixing belt.

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, a pressuring member, a heat source, a pressing member, a heating stop device, shape restricting members and biasing members. The fixing belt is provided to be rotatable around a rotation axis. The pressing member is provided to be rotatable and to come into pressure contact with the fixing belt so as to form a fixing nip. The heat source heats the fixing belt. The pressing member presses the fixing belt to a side of the pressuring member. The heating stop device faces an outer circumferential face of the fixing belt and to operate at an operating temperature so as to stop the heat source from heating the fixing belt. The shape restricting members are attached to both end parts of the fixing belt and restricts a shape of the fixing belt.

Abstract: A fixing device fixing an image on a recording medium includes a fixing belt rotatable around a first rotation axis, a pressuring member, a heat source body and a cover member. The pressuring member forms a nip part pressuring and making the recording medium pass through with the fixing belt. The heat source body is arranged inside the fixing belt and heats the fixing belt by emitting radiant heat. The cover member is arranged between the fixing belt and the heat source body and covers the heat source body. The nip part has a passing area where the recording medium passes through and a non-passing area outside the passing area in an axial direction. The cover member covers a part of the heat source body corresponding to the non-passing area and includes through holes formed so as to adjust surface temperature of the heat source body.

Abstract: A fixing device includes a fixing belt, a pressuring member, a heat source, a pressing member and a first heating stop device. The fixing belt is provided to be rotatable around a rotation axis. 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 heat source is arranged at an inner diameter side of the fixing belt, provided at a position displaced from the rotation axis and configured to heat the fixing belt. The pressing member is configured to press the fixing belt to a side of the pressuring member. The first heating stop device is configured to face an outer circumferential face of a closest part to the heat source of the fixing belt and to operate at a first operating temperature so as to stop the heat source from heating the fixing belt.