JP2002343549A - Induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent steadily wrong detection of the temperature sensor by shielding the effect of the leak magnetic flux of the excitation core on the temperature sensor, without making large size the device or involving detection failure of the temperature. SOLUTION: A nearly L-shape bent magnetic field shielding member 6 is provided between the induction coil 3 and the temperature sensor 4 at the gap section 3e of the induction coil 3 having arranged a temperature sensor 4. The magnetic field shield member 6 is formed by clipping a bending part by a first opposing face 6a opposed to the induction coil 3 and a second opposing face 6b opposed to the circumference of the heating roller 1 on a plate body of the length comparable to all region of the gap section 3e in the axis direction of the heating roller 1. The magnetic field shielding member 6 is positioned between a space D and the temperature sensor 4, and the leak magnetic flux generated in the space D is absorbed by the magnetic field shielding member 6 without affecting the temperature sensor 4. Even if the temperature sensor 4 is arranged in the gap section 3e of the induction coil 3, noise due to leak magnetic flux is not generated in the output signal, thereby, the temperature of the heating roller 1 can be detected precisely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device in a dry electrophotographic apparatus, a drying apparatus in a wet electrophotographic apparatus, a drying apparatus in an ink jet printer, and
The present invention relates to a heating device applied to an erasing device or the like for rewritable media, and more particularly to an induction heating device in which a heating member itself is heated by Joule heat.

[0002]

2. Description of the Related Art As a heating device, for example, in a dry electrophotographic image forming apparatus such as a copying machine, a fixing device constituted by a pair of a heating roller and a pressure roller for fusing and fixing a toner image transferred to a sheet. Conventionally, a halogen lamp is arranged in a heating roller in the apparatus, and the temperature of the heating roller is raised to a predetermined temperature at which the toner is melted by the halogen lamp.

However, in the method of increasing the temperature of the heating roller by using a halogen lamp, the thermal efficiency is low because the electric energy is temporarily converted into light energy, the rise of the temperature of the heating roller is delayed, and the heating roller is heated to a predetermined temperature. There is a problem that it takes a long time to raise. In addition, there is a problem that power consumption is large and running cost rises.

Therefore, in recent years, a conductive layer is formed on a heating roller, and an alternating magnetic field from a magnetic field generating means is applied to the heating roller, so that the heating roller itself generates heat using Joule heat generated by the eddy current generated in the heating roller. An induction heating type fixing device as described above has been proposed.

For example, Japanese Patent Application Laid-Open No. 9-305045 discloses a configuration in which a temperature sensor is arranged in a non-magnetic field space formed by an excitation core in an induction heating type fixing device. According to this configuration, it is said that a heating device having a quick start property, an energy saving type, and excellent temperature controllability and uniform heating property can be obtained.

[0006]

However, in the configuration disclosed in Japanese Patent Application Laid-Open No. 9-305045, there is a space between the exciting core and the heating member, and there is no leakage magnetic flux generated in this space. There is a problem that the temperature sensor disposed in the magnetic field space is greatly affected, and an error due to noise occurs in the detected temperature. That is, the induction heating device uses an eddy current generated in the conductive layer due to the alternating magnetic field generated by the magnetic field generating means interlinking the conductive layer of the heating member, and generates a temperature by Joule heat according to the electric resistance value of the conductive layer itself. The magnetic field generating means is arranged without contacting the heating member, and a leakage magnetic flux is easily generated in a space between the magnetic field generating means and the heating member. The detection element erroneously detects. On the other hand, if you try to place the temperature sensor in a position that is not affected by the leakage magnetic flux, sufficient space for placing the temperature sensor will be required, resulting in an increase in the size of the device and accurate detection of the temperature of the heating member. You can't do that.

In the configuration disclosed in Japanese Patent Application Laid-Open No. 9-305045, the excitation core and the temperature sensor are arranged inside the heating member. However, even in the configuration in which the excitation core and the temperature sensor are arranged outside the heating member, The same problem arises.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the temperature sensor from being erroneously detected without blocking the effect of the leakage magnetic flux of the exciting core on the temperature sensor, thereby increasing the size of the apparatus and causing a failure in temperature detection. It is an object of the present invention to provide an induction heating device capable of performing the above-described steps.

[0009]

The present invention has the following arrangement as means for solving the above-mentioned problems.

(1) A heating member having a magnetic field generating means for generating an alternating magnetic field, and a conductive layer formed at least partially in the alternating magnetic field generated by the magnetic field generating means with a space provided between the magnetic field generating means. And a temperature detecting element disposed opposite to the peripheral surface of the heating member, and exciting means for exciting the magnetic field generating means based on an output signal of the temperature detecting element, wherein the heating member heats the object to be heated. In the induction heating device, a magnetic field shielding member is provided around the temperature detecting element.

In this configuration, the magnetic field shielding member is arranged around the temperature detecting element arranged opposite to the peripheral surface of the heating member whose temperature rises due to the alternating magnetic field generated by the magnetic field generating means. Therefore, the temperature detecting element is shielded from the magnetic flux leakage generated in the space between the magnetic field generating means and the heating member by the magnetic field shielding member, and erroneous detection due to the influence of the magnetic flux leakage does not occur.

(2) The magnetic field shielding member is disposed between the temperature detecting element and the peripheral surface of the heating member, and the area of the magnetic field shielding member facing the peripheral surface of the heating member is larger than the area of the temperature detecting element. It is characterized by.

In this configuration, a magnetic field shielding member having a larger area facing the peripheral surface of the heating member than the temperature detecting element is disposed between the temperature detecting element and the peripheral surface of the heating member.
Therefore, the temperature detecting element does not directly face the peripheral surface of the heating member, and is not affected by the leakage magnetic flux generated in the space between the magnetic field generating means and the heating member.

(3) The magnetic field shielding member is disposed between the temperature detecting element and the magnetic field generating means in the peripheral direction of the heating member, and bends the peripheral surface of the heating member and the surface facing each of the magnetic field generating means. It is characterized in that it is a plate-like body formed by sandwiching the portion.

In this configuration, a magnetic field shielding member having a surface facing the peripheral surface of the heating member and a surface facing the magnetic field generating means is located between the temperature detecting element and the magnetic field generating means in the circumferential direction of the heating member. . Therefore, even when the temperature detecting element is arranged at a position close to the magnetic field generating means at which the amount of heat generated by the heating member is maximum, leakage from the space between the peripheral surface of the heating member and the magnetic field generating means toward the temperature detecting element is prevented. The magnetic flux is reliably absorbed by the magnetic field shielding member,
It does not affect the temperature sensing element.

(4) The magnetic field generating means is an induction coil wound around an air gap provided in the center, and the temperature detecting element is arranged in the air gap of the induction coil.

In this configuration, the temperature detecting element is disposed in the gap of the induction coil serving as the magnetic field generating means. Therefore, the temperature detecting element is arranged in a position close to the magnetic field generating means at which the heating value of the heating member is maximized and in a space shared with the magnetic field generating means. Never do.

(5) A heating member having a magnetic field generating means for generating an alternating magnetic field, and a conductive layer formed at least partially in the alternating magnetic field generated by the magnetic field generating means with a gap between the magnetic field generating means. And a temperature detecting element disposed opposite to the peripheral surface of the heating member, and exciting means for exciting the magnetic field generating means based on an output signal of the temperature detecting element, wherein the heating member heats the object to be heated. In the induction heating apparatus, the exciting means is characterized in that an LC filter is arranged at least between the temperature detecting element and the voltage detecting section in a circuit from the power supply section to the voltage detecting section via the temperature detecting element. .

In this configuration, an LC filter is arranged at least between the temperature detecting element and the voltage detecting section in a circuit from the power supply section to the voltage detecting section via the temperature detecting element. Therefore, the noise component generated in the output signal of the temperature detecting element due to the leakage magnetic flux generated in the space between the magnetic field generating means and the peripheral surface of the heating member is converted from the output signal by the LC filter before being input to the voltage detecting unit. Even when the temperature detection element is removed and the temperature detection element is arranged close to the magnetic field generating means, the voltage detection section accurately detects the temperature of the heating member based on the output signal of the temperature detection element.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an induction heating device according to an embodiment of the present invention will be described by taking a fixing device used in an image forming apparatus as an example. FIG. 1 is a schematic diagram illustrating a configuration of a process unit of an image forming apparatus to which a fixing device as an induction heating device according to an embodiment of the present invention is applied. The process unit 10 moves the four image forming stations 10Y, 10M, 10C, and 10B on the upper surface of the endless transfer / transport belt 33 stretched over the driving roller 31 and the driven roller 32 to move the upper surface of the transfer / transport belt 33. Are arranged in this order in the direction. The transfer conveyance belt 33 conveys the sheet P fed from the sheet tray 20 to the fixing device 40 while sequentially facing the image forming stations 10Y, 10M, 10C, and 10B with the sheet P placed on the upper surface.

Image forming stations 10Y, 10M, 1
0C and 10B perform image formation by dry electrophotography based on image data of each color of yellow (Y), magenta (M), cyan (C) and black (B). For this reason, the image forming stations 10Y, 10M,
10C and 10B have the same configuration except that toners of yellow (Y), magenta (M), cyan (C), and black (B) are stored, respectively. As an example, the image forming station 10 </ b> Y arranges a charger 12, an exposure unit 13, a developing unit 14, a transfer unit 15, and a cleaner 16 around the photosensitive drum 11 in this order in the rotation direction of the photosensitive drum 11. It is configured.

In the image forming station 10Y, the peripheral surface of the photosensitive drum 11 rotating in the
After the uniform charge is uniformly applied by 2, the exposure unit 13 receives image light irradiation based on yellow (Y) image data. As a result, an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 11, and the electrostatic latent image is visualized as a toner image by yellow (Y) toner supplied from the developing unit 14. This toner image is
The image is transferred onto the upper surface of the sheet P by the transfer unit 15 facing the peripheral surface of the photoconductor drum 11 with the transfer conveyance belt 33 interposed therebetween.

Image forming stations 10M, 10C, 1
0B, each of the colors magenta (M), cyan (C), and black (B) at a timing corresponding to the moving speed of the paper P that is moved by the rotation of the transfer and transport belt 33, similarly to the image forming station 10Y. Is formed. As a result, while the paper P is conveyed sequentially to the image forming stations 10Y, 10M, 10C, and 10B, yellow (Y), magenta (M), cyan (C), and black The toner images of each color (B) are sequentially transferred. The paper P to which the four color toner images have been transferred is heated and pressed in the fixing device 40, and the toner images are melted and fixed on the upper surface of the paper P. Thus, a full-color image is formed on the upper surface of the sheet P by subtractive color mixing of the toner images of the respective colors.

Incidentally, yellow (Y), magenta (M),
When forming an image of only some of the colors of cyan (C) and black (B), the image forming station 10
Among the Y, 10M, 10C, and 10B, the image forming process is executed only in the image forming station that stores the corresponding toner. For example, when forming a monochrome image, the image forming process is executed only in the image forming station 10B containing the black toner, and the other image forming stations 10Y, 10M, 1
At 0C, the image forming process is not performed.

FIG. 2 is a diagram showing a configuration of a fixing device in a process section of the image forming apparatus. Fixing device 40
Is constituted by a pair of upper and lower rollers composed of a heating roller 1 and a pressure roller 2. The heating roller 1 has a hollow cylindrical shape having a two-layer structure of an inner conductive layer 1a and an outer release layer 1b, which are heating members of the present invention. The pressure roller 2 is an elastic roller provided with an elastic layer 2b of rubber or the like on the outer periphery of a cored bar 2a, and is in pressure contact with the peripheral surface of the heating roller with a predetermined pressing force.

An induction coil 3, which is a magnetic field generating means of the present invention, faces a part of the peripheral surface of the heating roller 1. The induction coil 3 is provided with an excitation circuit 5 serving as the excitation means of the present invention.
Is supplied with power. The exciting circuit 5 is configured to control the induction coil 3 based on the temperature detected by the temperature sensor 4 including the temperature detecting element of the present invention disposed close to the peripheral surface of the heating roller 1.
To excite. When excited, the induction coil 3 generates an alternating magnetic field, and an eddy current is generated in the conductive layer 1a of the heating roller 1 by the alternating magnetic field. When an eddy current flows in the conductive layer 1a, the conductive layer 1a is heated by Joule heat according to the resistance value.

In the fixing device 40 configured as described above, the sheet P having the toner image T transferred to the surface thereof after the transfer step is completed, passes between the heating roller 1 and the pressure roller 2, and is heated and Receive pressure. At this time, the toner image T is
While being melted by the heating from the heating roller 1, it is pressed against the surface of the sheet P by the pressing force of the pressing roller 2,
It is firmly fixed on the surface of the paper P.

FIGS. 3A to 3C are a plan view, a side view and a front view of the fixing device. FIG. 4 is an external view of the induction coil. In a fixing device 40 in which a heating roller 1 and a pressure roller 2 are vertically arranged, an induction coil 3 is arranged so as to face an upper portion of a peripheral surface of the heating roller 1. As shown in FIG. 4, the induction coil 3 is configured such that one conductive wire is formed by linear portions 3 a and 3 b parallel to the axial direction of the heating roller 1 and arc portions 3 c and 3 along the circumferential direction of the heating roller 1.
A space 3e is formed and wound around d. A predetermined space D (see FIG. 2) is arranged in a state in which a part of the upper surface of the peripheral surface of the heating roller 1 is exposed in the space 3e and a predetermined space D (see FIG. 3 are arranged.

FIG. 5 is a diagram showing the arrangement of the temperature sensors in the fixing device. The temperature sensor 4 for detecting the temperature of the heating roller 1 is disposed on a part of the upper surface of the peripheral surface of the heating roller 1 so as to face a portion of the induction coil 3 exposed to the gap 3e. As described above, the heating roller 1 generates heat by Joule heat due to the eddy current in the conductive layer 1a due to the alternating magnetic field generated in the dielectric coil 3.

Therefore, in each part of the heating roller 1 in the circumferential direction (appearing in the side view of FIG. 3B), the part closest to the dielectric coil 3 is the most part according to the excitation state of the dielectric coil 3. The temperature changes quickly. For this reason, by arranging the temperature sensor 4 close to the position closest to the dielectric coil 3 in the heating roller 1, a temperature change of the heating roller 1 can be quickly detected. Further, by disposing the temperature sensor 4 in a range facing the induction coil 3 on the peripheral surface of the heating roller 1, compared with a case where the temperature sensor 4 is disposed facing another portion of the peripheral surface of the heating roller 1. Thus, the space can be effectively used, and the fixing device 40 can be downsized.

FIG. 6 is a diagram showing the structure of the temperature sensor. The temperature sensor 4 includes a holder 4a, a support plate 4b, a heat insulating elastic member 4c, a temperature detecting element 4d, a magnetic field shielding member 4e, and a sheet 4f. The holder 4a is fixed to a frame of an image forming apparatus (not shown), and a support plate 4b
Hold one end of The support plate 4b has, for example, a thickness of 0.1
A heat insulating elastic member 4c is attached to the lower surface of the other end. A temperature detecting element 4d is fixed to the lower surface of the heat insulating elastic member 4c.

The temperature detecting element 4d is connected to the exciting circuit 5 via a lead wire (not shown). Magnetic field shielding member 4
e and the sheet 4f are the temperature detecting element 4d and the heating roller 1
And the peripheral surface of the The magnetic field shielding member 4e is, for example, a plate having a thickness of about 40 μm. The area of the magnetic field shielding member 4e facing the peripheral surface of the heating roller 1 is sufficiently larger than the area of the temperature sensing element 4d. The sheet 4f covers the heat insulating elastic member 4c, the temperature detecting element 4d, and the magnetic field shielding member 4e on the lower surface on the other end side of the support plate 4b, and at least the outer surface is formed of a material having an extremely small friction coefficient.

With the above arrangement, in the temperature sensor 4, the lower surface of the other end of the support plate 4b is in contact with the peripheral surface of the heating roller 1 with a predetermined pressing force by the elastic force of the support plate 4b. At this time, between the peripheral surface of the heating roller 1 and the temperature detecting element 4d, a magnetic field shielding member 4e whose area facing the peripheral surface of the heating roller 1 is sufficiently wider than the temperature detecting element 4d is located. ing. Therefore, the temperature detecting element 4d does not directly face the peripheral surface of the heating roller 1,
Leakage magnetic flux generated in the space D between the induction coil 3 and the peripheral surface of the heating roller 1 is reliably absorbed by the magnetic field shielding member 4e, and noise is generated in the output signal of the temperature detection element 4d due to the influence of the magnetic flux leakage. Therefore, the temperature of the heating roller 1 can be accurately detected by the excitation circuit 5.

As a result of the experiment, when copper was used as the material of the magnetic field shielding member 4e, the effect of the leakage magnetic flux on the output signal of the temperature sensor 4 could not be effectively eliminated. When used, it could be effectively eliminated.

FIG. 7 is a diagram showing a configuration of a main part of a fixing device which is an induction heating device according to another embodiment of the present invention. In the fixing device 40 according to this embodiment, the magnetic field shielding member 6 bent in a substantially L-shape between the induction coil 3 and the temperature sensor 4 in the gap 3e of the induction coil 3 in which the temperature sensor 4 is disposed. Has been installed. The magnetic field shielding member 6
A plate-like body having a length equivalent to substantially the entire area of the gap 3 e in the axial direction of the heating roller 1 is formed by a first facing surface 6 a facing the induction coil 3 and a second facing surface facing the peripheral surface of the heating roller 1. The surface 6b is formed in a substantially L-shaped cross-sectional shape sandwiching the bent portion.

With this configuration, the magnetic field shielding member 6 is located between the temperature sensor 4 and the space D between the induction coil 3 that generates the leakage magnetic flux and the peripheral surface of the heating roller 1, and the leakage magnetic flux generated in the space D Is absorbed by the magnetic field shielding member 6 without affecting the temperature sensor 4. Thereby, the temperature sensor 4
Is disposed in the gap 3e of the induction coil 3, the output signal of the temperature sensor 4 does not generate noise due to the influence of the leakage magnetic flux, and the temperature of the heating roller 1 can be accurately detected.

FIG. 8 is a diagram showing a configuration of a fixing device which is an induction heating device according to still another embodiment of the present invention.
In the fixing device according to this embodiment, in the temperature sensor 4 and the excitation circuit 5, an LC is provided between the power supply VCC and the temperature detection element 4d in the circuit from the power supply VCC to the voltage detection unit 51 via the temperature detection element 4d. Arrange the filter 52a,
An LC filter 52b is arranged between the temperature detecting element 4d and the voltage detecting unit 51.

With this configuration, when the temperature sensor 4 is arranged close to the dielectric coil 3, the output signal of the temperature sensor 4 has noise due to the leakage magnetic flux generated in the space D between the dielectric coil 3 and the heating roller 1. Also occurs,
This noise is applied to the LC filters 52a and 52
b. Thus, the temperature of the heating roller 1 can be accurately detected.

By arranging at least the LC filter 52b in the excitation circuit 5, a relatively good noise removing effect can be obtained. Therefore,
The LC filter 52a is not essential. Where L
A sufficient noise removal effect cannot be obtained with only the C filter 52a.

The noise level in the output signal of the temperature sensor 4 in the fixing device 40 according to the above embodiment is set to "1" when no measure is taken, and as shown in FIG. The value is “0.8” when the magnetic field shielding member 4 e is provided between the magnetic field shielding member 4 e and the peripheral surface of the LC filter 52 in the excitation circuit 5 as shown in FIG.
a, 52b, it is “0.72”, and FIG.
As shown in FIG. 7, the value was "0.6" in the case where the magnetic field shielding member 6 was disposed between the induction coil 3 and the temperature sensor 4. Therefore, the fixing device 4 according to any one of the above-described embodiments.
Even at 0, the temperature of the heating roller 1 can be accurately detected by the temperature sensor 4 disposed close to the induction coil 3.

When the noise level when no countermeasure is taken is set to “1”, the magnetic field shielding member 6 is connected to the temperature detecting element 4.
d when the noise level is set only on the upper surface of “d.
2 ", and the noise level when the magnetic field shielding member 6 was disposed on the upper and lower surfaces of the temperature detecting element 4d was" 1.08 ". It can be seen that a sufficient noise removing effect can be obtained.

[0042]

According to the present invention, the following effects can be obtained.

(1) By arranging a magnetic field shielding member around a temperature detecting element arranged opposite to a peripheral surface of a heating member whose temperature rises due to an alternating magnetic field generated by a magnetic field generating means, The temperature detecting element can be shielded from the leakage magnetic flux generated in the space between the magnetic field generating means and the heating member, and the occurrence of noise due to the leakage magnetic flux can be prevented, and the temperature of the heating member can be accurately detected. .

(2) By disposing a magnetic field shielding member having a larger area facing the peripheral surface of the heating member than the temperature detecting element, between the temperature detecting element and the peripheral surface of the heating member, The temperature of the output signal of the temperature sensing element does not cause noise due to the influence of leakage magnetic flux generated in the space between the magnetic field generating means and the heating member. The temperature of the member can be accurately detected.

(3) By disposing a magnetic field shielding member having a surface facing each of the peripheral surface of the heating member and the magnetic field generating means between the temperature detecting element and the magnetic field generating means in the peripheral direction of the heating member. Even when the temperature sensing element is arranged at a position close to the magnetic field generating means at which the heating value of the heating member is maximized, the leakage flux from the space between the peripheral surface of the heating member and the magnetic field generating means toward the temperature sensing element can be reduced. To
Absorption can be ensured by the magnetic field shielding member, and the temperature of the heating member can be accurately detected.

(4) By disposing the temperature detecting element in the gap of the induction coil which is the magnetic field generating means, the temperature detecting element is located at a position close to the magnetic field generating means at which the heating value of the heating member is maximized. The temperature sensing element can be arranged in the shared space, and the device can be prevented from being enlarged due to the space in which the temperature sensing element is arranged.

(5) By providing an LC filter between at least the temperature detecting element and the voltage detecting section in a circuit from the power supply section to the voltage detecting section via the temperature detecting element, the magnetic field generating means and the heating member are provided. A noise component generated in the output signal of the temperature detecting element due to a leakage magnetic flux in a space between the temperature detecting element and the peripheral surface of the temperature detecting element can be removed from the output signal by the LC filter before being input to the voltage detecting unit. Even when the heating member is disposed close to the magnetic field generating means, the temperature of the heating member can be accurately detected by the voltage detection unit based on the output signal of the temperature detection element.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a process unit of an image forming apparatus to which a fixing device as an induction heating device according to an embodiment of the present invention is applied.

FIG. 2 is a diagram illustrating a configuration of a fixing device in a process unit of the image forming apparatus.

FIG. 3 is a plan view, a side view, and a front view of the fixing device.

FIG. 4 is an external view of an induction coil provided in the fixing device.

FIG. 5 is a diagram showing an arrangement state of a temperature sensor in the fixing device.

FIG. 6 is a diagram showing a configuration of the temperature sensor.

FIG. 7 is a diagram illustrating a configuration of a main part of a fixing device that is an induction heating device according to another embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a fixing device which is an induction heating device according to still another embodiment of the present invention.

[Explanation of symbols]

 1-Heating roller 1a-Conductive layer 2-Pressure roller 3-Induction coil 3e-Void portion 4-Temperature sensor 4d-Temperature detecting element 4e, 6-Magnetic field shielding member 5-Excitation circuit (excitation means) 52a, 52b-LC Filter D-space P-paper (object to be heated)

Claims (5)

[Claims] 1. A magnetic field generating means for generating an alternating magnetic field, and a heating member having a conductive layer formed at least partially in the alternating magnetic field generated by the magnetic field generating means with a space provided between the magnetic field generating means and An induction unit that heats an object to be heated by the heating member, comprising: a temperature detection element disposed opposite to a peripheral surface of the heating member; and an excitation unit that excites a magnetic field generation unit based on a temperature detected by the temperature detection element. An induction heating apparatus, wherein a magnetic field shielding member is provided around a temperature detecting element. 2. The method according to claim 1, wherein the magnetic field shielding member is disposed between the temperature detecting element and a peripheral surface of the heating member, and an area of the magnetic field shielding member facing the peripheral surface of the heating member is larger than an area of the temperature detecting element. The induction heating device according to claim 1, wherein: 3. The magnetic field shielding member is disposed between the temperature detecting element and the magnetic field generating means in a circumferential direction of the heating member, and a bent surface is formed on the peripheral surface of the heating member and a surface facing each of the magnetic field generating means. The induction heating device according to claim 1, wherein the induction heating device is a plate-shaped body formed by sandwiching the plate. 4. The magnetic field generating means is an induction coil wound around an air gap provided in the center, and the temperature detecting element is disposed in the air gap of the induction coil. The induction heating device according to any one of the above. 5. A heating member having a magnetic field generating means for generating an alternating magnetic field, and a conductive layer formed at least partially in the alternating magnetic field generated by the magnetic field generating means with a space provided between the magnetic field generating means. A temperature detecting element disposed opposite to the peripheral surface of the heating member, and exciting means for exciting the magnetic field generating means based on an output signal of the temperature detecting element, wherein the heating member heats the object to be heated. In the heating apparatus, the exciting means is characterized in that an LC filter is arranged at least between the temperature detecting element and the voltage detecting section in a circuit from the power supply section to the voltage detecting section via the temperature detecting element. Heating equipment.