JP5019779B2 - Temperature detection device and fixing device equipped with the same - Google Patents

Description

  The present invention relates to a temperature detection device including a non-contact temperature detection sensor that obtains a surface temperature of an object to be detected using a temperature detection element and a temperature compensation element. The present invention also relates to a fixing device equipped with this temperature detection device for temperature control of the fixing member and / or the pressure member.

  In an electrophotographic image forming apparatus typified by a copying machine or a printer, a thermal fixing method is widely used as a method for fixing an unfixed toner image transferred onto a sheet by a transfer unit. In this thermal fixing method, two rotating members composed of a roller and a belt are brought into pressure contact with each other to form a fixing nip, which is rotated by a heating means arranged in one or both of these rotating members. By heating the member and inserting a paper carrying an unfixed toner image into the fixing nip, the toner is fixed on the paper.

  As a fixing device of such a heat fixing system, a heat roller (fixing member) is a roller that directly contacts an unfixed toner image on a sheet, out of two rollers constituting a pair of rollers that are in pressure contact with each other. In general, a heating roller is incorporated with a heating means such as a halogen lamp. In order to obtain a stable fixing property, the surface temperature of the heat roller is monitored by a temperature detection device equipped with a temperature sensor such as a thermistor, and the amount of heat generated by a heating means such as a halogen lamp is controlled, so Is maintained at an appropriate temperature.

  Conventionally, the surface temperature of the heat roller has been detected by a contact-type temperature detecting device that contacts the surface. That is, a temperature sensor such as a thermistor is brought into contact with the non-sheet passing area of the surface of the heat roller, and the temperature control of the heat roller by the heating means is performed based on the surface temperature of the non-sheet passing area. However, when the temperature sensor is brought into contact with the surface of the heat roller, the surface of the heat roller is damaged, or toner or paper dust remaining around the temperature detection device adheres to the temperature detection part of the sensor, so that an appropriate temperature detection is possible. There was a problem that could not be done. Therefore, in order to solve such a problem, a temperature detection device provided with a non-contact type temperature detection sensor that is provided at a position slightly away from the surface of the heat roller and detects the surface temperature is proposed. Reference 1 can be seen.

  The non-contact type temperature detection device includes a temperature detection element (detection thermistor) that detects heat radiated from an object to be detected through an infrared film, and a temperature compensation element (compensation thermistor) that detects the ambient temperature. And a non-contact temperature detection sensor that calculates the output value to obtain the surface temperature of the object to be detected. Since the non-contact temperature detection sensor performs arithmetic processing using two thermistors to obtain the temperature of the detected object while correcting the ambient temperature, it can be said that the detection accuracy is stable.

  However, in such a non-contact temperature detection sensor, when the ambient temperature changes rapidly, the compensation thermistor cannot cope with this change, and temperature compensation may not be performed accurately. Thereby, the detection accuracy of a sensor falls and it is difficult to grasp | ascertain the temperature of a to-be-detected object. In particular, in an image forming apparatus, this tendency is remarkable in a fixing device having a short warm-up time. There is a problem that the temperature distribution is greatly different even in the same sensor such that the temperature of the non-contact temperature detection sensor on the heat roller side rapidly rises, but the temperature on the opposite side hardly increases.

Thus, a temperature detection device using a non-contact temperature detection sensor that can cope with a sudden change in ambient temperature has been proposed, and an example thereof can be seen in Patent Document 2. In the heating device described in Patent Document 2, a member having low thermal conductivity is inserted between the non-contact temperature detection sensor and the frame (holding member) of the fixing device that holds the sensor.
JP-A-60-51872 (page 2-3, FIG. 3-4) JP 2003-257591 A (page 4, FIG. 8)

  In the heating device described in Patent Literature 2, a member having a low thermal conductivity is inserted between the non-contact temperature detection sensor and the frame (holding member) of the fixing device, so that the sensor and the frame of the fixing device are Heat is not transferred between the two. However, even if the member has a low heat transfer rate and low heat capacity, there is no heat transfer between the sensor and the holding member. Especially when the contact area is large, temperature compensation by a compensating thermistor is possible. May adversely affect Therefore, even with such a non-contact temperature detection sensor, it may be difficult to grasp the temperature of the object to be detected when the ambient temperature changes abruptly.

  The present invention has been made in view of the above points, and is provided with a temperature detecting element for detecting heat radiated from the object to be detected and a temperature compensating element for detecting the ambient temperature, and these output values are obtained. In a temperature detection device equipped with a non-contact temperature detection sensor that calculates the surface temperature of the object to be detected, when the ambient temperature of the sensor changes abruptly by modifying the method of holding the non-contact temperature detection sensor Even so, an object of the present invention is to provide a temperature detection device capable of accurately detecting the temperature of an object to be detected. Another object of the present invention is to provide a high-performance fixing device in which the heating efficiency is improved by mounting such a temperature detection device.

  In order to solve the above problems, the present invention is provided with a temperature detecting element for detecting heat radiated from an object to be detected and a temperature compensating element for detecting an ambient temperature, and calculating the output values thereof. In the temperature detection apparatus including the non-contact temperature detection sensor for obtaining the surface temperature of the detection object and the holding member for holding the non-contact temperature detection sensor, the holding member projects the non-contact temperature detection sensor. It was decided to provide an opening that allows air to flow in and around the location.

  Further, in the temperature detection device having the above configuration, the holding member is formed of a flat plate-like member and includes a bent portion, and the non-contact temperature detection sensor is held on the top end surface of the bent portion.

  Further, in the temperature detection device having the above configuration, a heat insulating member is provided between the non-contact temperature detection sensor and the holding member.

  In the present invention, the temperature detection device is mounted on the fixing device in order to detect the surface temperature of the fixing member and / or the pressure member.

  According to the configuration of the present invention, the temperature detecting element for detecting the heat radiated from the detected object and the temperature compensating element for detecting the ambient temperature are provided, and the output value is calculated to detect the detected object. In the temperature detection apparatus including the non-contact temperature detection sensor for obtaining the surface temperature of the non-contact temperature and the holding member for holding the non-contact temperature detection sensor, the holding member The non-contact temperature detection sensor can reduce the number of contact points with the holding member as much as possible, and can transfer heat between the sensor and the holding member. While suppressing, it is possible to directly detect the heat radiated from the object to be detected in a wide area on the sensor surface. Thereby, temperature compensation by the temperature compensation element can be suitably performed. Therefore, even when the ambient temperature of the sensor changes abruptly, it is possible to obtain a temperature detection device that can accurately detect the temperature of the object to be detected.

  In addition, since the holding member is formed of a flat plate-like member and includes a bent portion, and the non-contact temperature detection sensor is held by the top end face of the bent portion, the holding member of the non-contact temperature detection sensor and The number of contact points can be further reduced. Thereby, the effect | action which suppresses transmission of the heat between a sensor and a holding member is heightened. Therefore, the accuracy of temperature compensation by the temperature compensation element can be improved, and the temperature of the object to be detected can be detected more accurately.

  In addition, since the heat insulating member is provided between the non-contact temperature detection sensor and the holding member, it is possible to further enhance the action of suppressing heat transfer between the sensor and the holding member. Therefore, the accuracy of temperature compensation by the temperature compensating element can be further improved, and the temperature detection accuracy of the object to be detected is also improved.

  In the present invention, since the temperature detection device is mounted on the fixing device in order to detect the surface temperature of the fixing member and / or the pressure member, the ambient temperature of the non-contact temperature detection sensor changes rapidly. Even in this case, it is possible to accurately detect the temperature of the object to be detected, and it is possible to obtain a high-performance fixing device in which the heating efficiency is improved.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  First, the outline of the configuration of the fixing device equipped with the temperature detection device according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic vertical sectional front view of a fixing device equipped with a temperature detection device.

  As shown in FIG. 1, the fixing device 1 includes a heat roller 2 that is a fixing member and a pressure roller 3 that is a pressure member. The heat roller 2 and the pressure roller 3 are pressed against each other with a predetermined pressure to form a fixing nip having a predetermined width in the sheet conveyance direction. A sheet carrying an unfixed toner image passes through the fixing nip. The heat roller 2 is in direct contact with the unfixed toner image on the paper.

  The heat roller 2 is driven to rotate by driving means (not shown). The pressure roller 3 rotates according to the rotation of the heat roller 2 by being in contact with the heat roller 2. In a normal fixing operation, the heat roller 2 is clockwise and the pressure roller 3 is counterclockwise so as to fix the unfixed toner on the surface of the sheet while conveying the sheet from right to left in FIG. Rotate.

  The heat roller 2 has an outer diameter of 31 mm and is provided with a release layer in close contact with the surface of an iron core bar having a thickness of 0.35 mm to improve smoothness and toner release properties. For the release layer, a fluorine-based resin such as PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) is used, and the layer is provided by applying a paint or covering the tube. A PFA tube has a thickness of 60 μm, and a fluororesin paint has a thickness of 25 μm.

  The pressure roller 3 includes silicon rubber that constitutes an elastic member layer on the outside of a cored bar made of stainless steel.

  Inside the heat roller 2, a halogen lamp 4 as a heating means is arranged. The halogen lamp 4 has an output of 1150 W and heats the heat roller 2 from the inside. The halogen lamp 4 has a rod shape extending in the axial direction of the heat roller 2, and one halogen lamp 4 is provided. The heat generated from the halogen lamp 4 is transmitted through the core metal and the elastic member layer of the heat roller 2 and reaches the surface, and the heat of the surface of the heat roller 2 melts the unfixed toner carried on the paper.

  Above the heat roller 2, a temperature detection device 10 is provided. The temperature detection device 10 is a non-contact type temperature detection device that detects the surface temperature of the heat roller 2, and is disposed at a substantially central portion in the axial direction of the heat roller 2. The temperature detection device 10 includes a non-contact temperature detection sensor 20 and a holding member 30 thereof.

  The non-contact temperature detection sensor 20 is disposed above the heat roller 2 with a predetermined gap. This non-contact temperature detection sensor 20 detects the temperature by obtaining infrared rays emitted from the heat roller 2 as a detection object as heat energy. The holding member 30 holds the non-contact temperature detection sensor 20 so as not to move from a predetermined position, and is supported by a housing (not shown) of the fixing device 1.

  Next, a detailed configuration of the temperature detection device 10 will be described with reference to FIGS. 2 to 5 in addition to FIG. 2 is a schematic perspective view of a non-contact temperature detection sensor, FIG. 3 is a vertical sectional side view of the non-contact temperature detection sensor, FIG. 4 is a vertical sectional front view of the temperature detection device, and FIG. 5 is a bottom view of the temperature detection device. is there.

  As shown in FIGS. 2 and 3, the non-contact temperature detection sensor 20 provided in the temperature detection device 10 includes a housing 21 as an exterior. The main part of the housing 21 has a rectangular parallelepiped shape and includes a detection window 22 on the lower surface. The housing 21 is configured not to be affected by the infrared rays emitted from the heat roller 2, and the infrared rays emitted from the heat roller 2 enter the inside of the housing 21 only through the detection window 22 (arrow in FIG. 3).

  The non-contact temperature detection sensor 20 is provided with two thermistors 23 and 24 inside the housing 21.

  The thermistor 23 is a temperature detection element (detection thermistor) that detects heat radiated from the heat roller 2 that is a detection object. The detection thermistor 23 is provided at a location inside the housing 21 corresponding to the detection window 22. An infrared absorption film 25 is disposed between the detection thermistor 23 and the detection window 22. The infrared rays emitted from the heat roller 2 pass through the inside of the detection window portion 22 and are converted into heat by the infrared absorption film 25, and this heat is detected by the detection thermistor 23 as heat radiated from the heat roller 2.

  On the other hand, the thermistor 24 is a temperature compensating element (compensating thermistor) that detects the ambient temperature. The compensation thermistor 24 is provided inside the housing 21 that is not affected by the infrared rays emitted from the heat roller 2. Thereby, the compensation thermistor 24 detects only the temperature of the housing 21 as the ambient temperature.

  The temperature information of the detection thermistor 23 and the compensation thermistor 24 is sent to a control unit (not shown) via the cable 26. In the control unit, the differential amplifier circuit amplifies the difference between the output value of the detection thermistor 23 and the output value of the compensation thermistor 24, and AD converts the differential amplification output value and the output value of the compensation thermistor 24. Then, it is transferred to a microcomputer (not shown). The microcomputer has a temperature conversion table for these two output values. In this way, the non-contact temperature detection sensor 20 calculates the output values of the detection thermistor 23 and the compensation thermistor 24 to obtain the surface temperature of the heat roller 2.

  The non-contact temperature detection sensor 20 is held by the holding member 30 shown in FIGS. 4 and 5. The holding member 30 is configured by a flat plate-like member, and includes an opening 31 and a fastener 32.

  The opening 31 is provided so as to penetrate the holding member 30 in a portion of the holding member 30 where the non-contact temperature detection sensor 20 is projected and a region extending in the vicinity thereof. The opening 31 has a main shape similar to the shape of the non-contact temperature detection sensor 20 projected, and has a rectangular shape larger than the projection region.

  A support portion 33 having a shape in which the flat holding member 30 is locally protruded from the edge of the opening 31 toward the inside is provided. The support portion 33 is provided at four locations, and holds the lower surface of the non-contact temperature detection sensor 20 so that the non-contact temperature detection sensor 20 does not fall downward through the opening 31. Of the four support portions 33, one support portion 33 a extends to a position on the detection window portion 22.

  Further, similarly to the support portion 33, the edge portion of the opening portion 31 is provided with a positioning portion 34 having a shape in which a flat holding member 30 is locally projected from the edge portion toward the inside. As shown in FIG. 4, the positioning portion 34 is bent substantially vertically upward at a location where it comes into contact with the non-contact temperature detection sensor 20. The positioning portion 34 is a plane that faces the side surface of the non-contact temperature detection sensor 20 by being bent, and holds the sensor so that it cannot move in the lateral direction. The longitudinal direction of the non-contact temperature detection sensor 20 is held by a positioning part 34a located on the left side in FIG. 5 and a support part 33a hooked on the detection window part 22, and the direction perpendicular to this is four positioning parts 34b. Is holding in.

  A fastener 32 shown in FIG. 4 is provided for the non-contact temperature detection sensor 20 arranged in the opening 31 in this way. The fastener 32 is formed by bending a linear member having elasticity, and is provided in such a manner that the non-contact temperature detection sensor 20 is pressed against the holding member 30 from above. As a result, the non-contact temperature detection sensor 20 is held immovable upward.

  With the configuration of the holding member 30 as described above, air can be circulated at and around the location where the non-contact temperature detection sensor 20 is projected, as shown by the arrows in FIG. Therefore, the heat generated from the heat roller 2 easily reaches the entire surface of the housing 21 including the upper surface of the non-contact temperature detection sensor 20.

  Next, the heating operation of the fixing device 1 will be described with reference to FIGS. 6 and 7. FIG. 6 is a temperature transition diagram of the heat roller detected by the thermocouple and the non-contact temperature detection sensor of the temperature detection device of the present invention, and FIG. 7 is the heat detected by the non-contact temperature detection sensor of the thermocouple and the temperature detection device of the comparative example. It is a temperature transition diagram of a roller.

  FIGS. 6 and 7 depict the temperature transition from the start of heating to 60 seconds after the heat roller sufficiently left at room temperature. The set temperature on the surface of the heat roller is 200 ° C. The actual surface temperature of the heat roller was measured by bringing a thermocouple into contact with the surface of the heat roller. In addition, in FIG. 6 and FIG. 7, in addition to the transition of the actual heat roller surface temperature by the thermocouple (left scale) and the transition of the heat roller surface temperature by the non-contact temperature detection sensor (left scale), These temperature differences (right scale) are also drawn.

  Moreover, the structure of the temperature detection apparatus which is a comparative example which obtained the temperature transition diagram of FIG. 7 is shown as a bottom view in FIG. Similar to the temperature detection device 10 of the present invention (see FIG. 5), the temperature detection device 100 of this comparative example includes a non-contact temperature detection sensor 120 and a holding member 130 thereof. However, the opening 131 provided in the holding member 130 passes through the holding member 130 only at the location of the detection window 122 of the non-contact temperature detection sensor 120. Most of the housing 121 of the non-contact temperature detection sensor 120 is disposed so as to be isolated upward from the heat roller 2 (see FIG. 1) with the holding member 130 therebetween. That is, the heat radiated from the heat roller 2 does not wrap around the non-contact temperature detection sensor 120.

  As shown in FIG. 7, the heating operation in the case of the comparative example to which the temperature detecting device 100 is applied, the surface of the heat roller 2 reaches about 180 ° C. at about 10 seconds after the start of heating. The temperature difference between the non-contact temperature detection sensor 120 and the thermocouple is about 23 ° C. Then, it takes about 55 seconds to stabilize the temperature detecting means so that there is almost no temperature difference.

  On the other hand, the heating operation when the temperature detection device 10 of the present invention is applied, as shown in FIG. 6, the surface of the heat roller 2 reaches about 180 ° C. at a stroke in about 10 seconds after the start of heating. The temperature difference between the non-contact temperature detection sensor 20 and the thermocouple is about 18 ° C. Therefore, it can be seen that the temperature difference between these temperature detection means is smaller and the temperature detection accuracy is higher than in the comparative example of FIG. Further, it takes about 40 seconds until the temperature difference between these temperature detection means is stabilized. Thereby, it turns out that the temperature detection apparatus 10 of this invention is superior to a comparative example also about adaptability.

  As described above, the detection thermistor 23 that is a temperature detection element that detects heat radiated from the heat roller 2 that is a detection object, and the compensation thermistor 24 that is a temperature compensation element that detects the ambient temperature. In the temperature detection device 10 provided with a non-contact temperature detection sensor 20 that calculates the output value to obtain the surface temperature of the heat roller 2 and a holding member 30 that holds the non-contact temperature detection sensor 20. Since the holding member 30 includes an opening 31 through which air can be circulated at and around the location where the non-contact temperature detection sensor 20 is projected, the non-contact temperature detection sensor 20 is connected to the holding member 31. The number of contact points can be reduced as much as possible, the heat transfer between the sensor 20 and the holding member 31 is suppressed, and the heat roller 2 is formed over a wide area on the surface of the sensor 20. It is possible to detect the heat et radiated directly. Thereby, temperature compensation by the compensation thermistor 24 can be suitably performed. Therefore, even when the ambient temperature of the sensor 20 changes abruptly, it is possible to obtain the temperature detection device 10 that can accurately detect the temperature of the heat roller 2.

  In the present invention, since the temperature detecting device 10 is mounted on the fixing device 1 in order to detect the surface temperature of the heat roller 2 as a fixing member, the ambient temperature of the non-contact temperature detecting sensor 20 changes rapidly. Even so, it is possible to accurately detect the temperature of the heat roller 2 and to obtain a high-performance fixing device 1 in which the heating efficiency is improved.

  Next, a detailed configuration of the temperature detection device according to the second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a vertical sectional front view of the temperature detecting device. The basic configuration of this embodiment is the same as that of the first embodiment described with reference to FIGS. 1 to 5, and therefore, the configuration common to the first embodiment is described in the drawings, and The description will be omitted. In this regard, in FIG. 9, the drawing of the fastener 32 that is a component of the temperature detection device 10 is omitted.

  In the temperature detection apparatus 10 according to the second embodiment, the holding member 30 includes a support portion 35 at the edge of the opening 31 as shown in FIG. Similar to the positioning portion 34, the support portion 35 projects the flat plate-like holding member 30 locally from the edge of the opening portion 31 and bends it to a location below the non-contact temperature detection sensor 20. A portion 35a is provided, and its end surface is directed substantially vertically upward. The holding member 30 holds the lower surface of the non-contact temperature detection sensor 20 at the top end surface of the support portion 35.

  According to such a structure, the contact location with the holding member 30 of the non-contact temperature detection sensor 20 can further be reduced. Therefore, the effect | action which suppresses transmission of the heat between the non-contact temperature detection sensor 20 and the holding member 30 is heightened. As a result, the accuracy of temperature compensation by the compensation thermistor 24 can be improved, and the temperature of the heat roller 2 can be detected more accurately.

  Next, a detailed configuration of the temperature detection device according to the third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a vertical sectional front view of the temperature detection device. The basic configuration of this embodiment is the same as that of the first embodiment described with reference to FIGS. 1 to 5, and therefore, the configuration common to the first embodiment is described in the drawings, and The description will be omitted. In this regard, in FIG. 10, the drawing of the fastener 32 that is a component of the temperature detection device 10 is omitted.

  In the temperature detection apparatus 10 according to the third embodiment, the holding member 30 includes a support portion 33 and a positioning portion 34 at the edge of the opening 31 as shown in FIG. A heat insulating member 36 is provided between the support portion 33 and the positioning portion 34 and the non-contact temperature detection sensor 20. That is, the non-contact temperature detection sensor 20 is held by the holding member 30 via the heat insulating member 36. The heat insulating member 36 is made of a material such as ceramic or rubber in addition to a synthetic resin.

  Thus, since the heat insulation member 36 is provided between the non-contact temperature detection sensor 20 and the holding member 30, the action of suppressing heat transfer between the non-contact temperature detection sensor 20 and the holding member 30 is achieved. It becomes possible to further increase. Accordingly, the accuracy of temperature compensation by the compensation thermistor 24 can be further improved, and the temperature detection accuracy of the heat roller 2 is also improved.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  For example, the non-contact temperature detection sensor is not limited to the configuration shown in FIGS. 2 and 3, and a temperature detection element that detects heat radiated from the detection object and a temperature that detects the ambient temperature. Any other configuration may be used as long as a compensation element is provided and the output temperature is obtained to obtain the surface temperature of the object to be detected.

  Further, as shown in FIGS. 1 and 4, the non-contact temperature detection sensor 20 is held on the upper surface of the holding member 30, and is disposed at a location separating the holding member 30 from the heat roller 2. The heat roller 2 may be held close to the holding member 30 so as to be positioned below the holding member 30. The configuration of the opening 31 of the holding member 30 such as shape and size is not limited to the configuration of the present embodiment.

  In the embodiment of the present invention, the temperature detection device 10 is mounted on the fixing device 1 in order to detect the surface temperature of the heat roller 2 that is a fixing member. The present invention may be applied to detect the temperature of the pressure roller 3 and other components other than the fixing device.

  The present invention can be used in a temperature detection apparatus including a non-contact temperature detection sensor that obtains a surface temperature of an object to be detected using a temperature detection element and a temperature compensation element.

1 is a schematic vertical sectional front view of a fixing device equipped with a temperature detecting device according to a first embodiment of the present invention. It is a model perspective view of the non-contact temperature detection sensor of the temperature detection apparatus shown in FIG. FIG. 3 is a vertical sectional side view of the non-contact temperature detection sensor shown in FIG. 2. It is a vertical cross-sectional front view of the temperature detection apparatus shown in FIG. It is a bottom view of the temperature detection apparatus shown in FIG. It is the temperature transition figure of the heat roller detected with the non-contact temperature detection sensor of the thermocouple and the temperature detection apparatus shown in FIG. It is the temperature transition figure of the heat roller detected with the non-contact temperature detection sensor of the temperature detection apparatus of a thermocouple and a comparative example. It is a bottom view of the temperature detection apparatus of a comparative example. It is a vertical cross section front view of the temperature detection apparatus which concerns on the 2nd Embodiment of this invention. It is a vertical cross section front view of the temperature detection apparatus which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

1 Fixing device 2 Heat roller (fixing member, detected object)
3 Pressure roller (Pressure member)
4 Halogen lamp 10 Temperature detection device 20 Non-contact temperature detection sensor 21 Housing 22 Detection window 23 Detection thermistor (temperature detection element)
24 Compensation Thermistor (Temperature Compensation Element)
25 Infrared absorbing film 30 Holding member 31 Opening portion 32 Fastener 33 Supporting portion 34 Positioning portion 35 Supporting portion 35a Bending portion 36 Thermal insulation member

Claims (3)

Non-contact temperature that provides a temperature detection element that detects the heat radiated from the object to be detected and a temperature compensation element that detects the ambient temperature, and calculates the output value to obtain the surface temperature of the object to be detected. In a temperature detection device including a detection sensor and a holding member that holds the non-contact temperature detection sensor,
The holding member is composed of a flat plate-like member , and includes an opening through which air can flow in and around the location where the non-contact temperature detection sensor is projected, and a local edge of the opening. A temperature detecting device that contacts the non-contact temperature detecting sensor only at a certain point, includes a bent portion, and holds the non-contact temperature detecting sensor on a top end surface of the bent portion . The temperature detecting device according to claim 1, further comprising a heat insulating member between the non-contact temperature detecting sensor and the holding member . A fixing device comprising the temperature detecting device according to claim 1 or 2 for detecting a surface temperature of a fixing member and / or a pressure member.

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