JPH09237675A - Heating device and image forming apparatus - Google Patents

Abstract

(57) Abstract: In a heating device and an image forming apparatus, an exciting coil guides movement of a moving body to simplify the apparatus, and an exciting coil moves a moving body including a heat generating portion. To improve the efficiency of heat generation with respect to the input voltage by providing a structure in which the heat-generating portion is guided or fixedly supported in contact with the exciting coil. SOLUTION: The exciting coil 2 is attached to a conductive heating portion 10-1.
In the heating device 100 of the electromagnetic induction heating system, in which a magnetic field of 0 is applied to generate an induction current, the heating portion is caused to generate heat by the induction current, and the material P to be heated which is moved together with the moving body 10 is heated, A heating device in which a body moves while being guided by the exciting coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for generating and heating an eddy current by utilizing electromagnetic induction, and an electrophotographic apparatus provided with the heating device as an image heating device for fixing an unfixed image, The present invention relates to an image forming apparatus such as an electrostatic recording device.

[0002]

2. Description of the Related Art As a heating device represented by a heat fixing device, a contact heating system such as a heat roller system or a film heating system has been widely used. The heat roller system is
For example, a metal fixing roller with a heater inside,
A pressure roller having elasticity that comes into pressure contact with the basic structure is used, and a recording material is introduced and passed through a fixing nip portion formed by the pair of rollers to heat and fix the toner image.

However, in such a heat roller system, since the heat capacity of the fixing roller is large, it takes a lot of time to raise the surface of the fixing roller to the fixing temperature. Also,
Therefore, in order to quickly execute the image output operation, it is necessary to control the temperature of the roller surface to a certain temperature even when the image formation is not performed.

That is, it takes a long time to warm up, and in order to speed up the first print, it is necessary to provide a standby state and keep the fixing roller in a heated state at all times. Further, the one using a halogen heater as the heat source is inefficient because energy is once converted into light.

Further, in a color image recording apparatus, a maximum of four toner layers may be stacked, and if the interface between the recording material and the toner layer is not sufficiently heated, fixing failure may occur. Therefore, in the roller fixing in color, the heat source is also provided in the pressure roller, and there is the same problem as described above. For example, if a halogen heater is used as a heat source, quick start cannot be realized. Further, there is a drawback that the heat capacity is large and the power consumption is large.

Therefore, Japanese Patent Publication No. 5-9027 proposes a device in which the metal roller itself is heated by an electromagnetic induction heating method to improve the thermal efficiency so that the metal roller does not become a thermal resistance.

This is to generate an alternating magnetic field by magnetic field generating means, for example, a core material which is a magnetic material, an exciting coil wound around the core material, and an exciting circuit which drives the exciting coil. That is, a magnetic field is repeatedly generated and extinguished (including one that does not change direction) on a metal roller as a conductive member (inductive magnetic material, magnetic field absorbing conductive material) that moves in the generated magnetic field by applying high frequency to the coil. The eddy current is generated in the metal roller, and heat is generated (Joule heat) by the eddy current and the electric resistance of the roller itself, and as a result, only the metal roller in close contact with the material to be heated is heated.

By utilizing the generation of the eddy current as described above, the heat generation position can be brought closer to the material to be heated, and the efficiency of energy consumption can be improved as compared with the heat roller type device using the halogen lamp.

However, in the above fixing method, the fixing roller having a large heat capacity has to be heated. Therefore, as shown in FIG. 14, an electromagnetic heating type / film heating type device is also known.

In the figure, 10 is a cylindrical fixing film, and an elastic layer 10-2 such as rubber is provided on the outer peripheral surface of the nickel electroformed layer 10-1, and Teflon (polytetrafluoroethylene) or the like is provided on the outer peripheral surface thereof. Of the release layer 10-3.
Reference numeral 20 is an exciting coil disposed in the fixing film 10, and has a core 20-3 and a winding 20-1 suspended around the core 20-3. Reference numeral 20-4 is a film guide, which supports the exciting coil 20 and fixes the fixing film 1.
It guides the inner circumference of 0. Reference numeral 30 denotes a pressure member, which is provided in contact with the core metal 30-2 such as iron, the elastic layer 30-1 of silicon rubber which is packaged on the core metal 30-2, and the outer peripheral surface of the elastic layer 30-1. It has a thermistor 30-3.

A pressure roller 30 is pressed against the lower surface of the film guide 20-4 having the exciting coil 20 with the fixing film 10 sandwiched therebetween to form a nip portion N. The magnetic field generated by the exciting coil 20 is applied to the fixing film 10. To generate an eddy current and heat the fixing film 10.

Then, the film 10 is rotated by the rotation of the pressing member 30, the recording material (heating material) P is introduced into the nipping portion N, and the recording material P is conveyed together with the film 10 and heated by electromagnetic induction. The heat of the film 10 is applied to the recording material P to heat and fix the unfixed toner T image carried on the recording material P.

[0013]

The electromagnetic heating type heating device requires a film guide 20-4 made of a liquid crystal polymer or the like to hold the fixing film 10, the coil 20-1, and the core core 20-3. is there.

However, the film guide 20-4 is the coil 2
The distance between 0-1 and the electroformed film 10-1 is increased, and the magnetic field generated by the coil is applied to the electroformed film 10-1.
Was preventing me from reaching. As a result, there has been a problem in improving the efficiency of the heat generation amount with respect to the input power.

Therefore, the present invention has a structure in which the exciting coil guides the movement of the moving body to simplify the apparatus, and the exciting coil guides the movement of the moving body including the heat generating portion or the heat generating portion is used as the exciting coil. It is intended to improve the efficiency of heat generation with respect to the input voltage by adopting a structure in which they are fixedly supported in contact with each other.

[0016]

According to the present invention, there is provided a heating apparatus and an image forming apparatus having the following constitutions.

(1) An electromagnetic field that causes a magnetic field generated by an exciting coil to act on a conductive heat generating portion to generate an induced current, heat the heat generating portion by the induced current, and heat a material to be heated that is moved together with a moving body. In induction heating type heating device,
A heating device, wherein the moving body moves while being guided by the exciting coil.

(2) An exciting coil for generating an induced current by causing a magnetic field to act on a conductive heat generating portion to heat the heat generating portion by the induced current, a moving body, and an exciting coil sandwiching the moving body. A heating member that is pressed against each other, and introduces a material to be heated between the moving member and the pressing member in the pressure contact portion and moves the member together with the moving member while applying heat to the heat generating portion to perform heat treatment. An electromagnetic induction heating type heating device, wherein the moving body is guided and moved by the exciting coil.

(3) The pressurizing member has a hollow roller having a heat generating portion, and an exciting coil supported in contact with the inner peripheral surface of the hollow roller, and the exciting coil is provided in the heat generating portion. The heating device according to (2), wherein a magnetic field is applied to generate an induced current, and the induced current causes the heating portion to generate heat to heat the member to be heated.

(4) The heating device as set forth in any one of (1) to (3), characterized in that a wire wheel forming an exciting coil guides the moving body.

(5) The heating device according to any one of (1) to (4), characterized in that the coil forming the exciting coil is covered with an insulating layer.

(6) The moving body is a laminated member including the heat generating portion as a heat generating layer, or the moving body itself is a heat generating portion. (1) to (5) Heating device.

(7) The moving body is a laminated member including a heat generating layer which is the heat generating portion and an insulating layer on the side of the exciting coil of the heat generating layer, and the insulating layer and the bare wire forming the exciting coil are The heating device according to any one of (1) to (4), wherein the heating device has a configuration in which the movement of the moving body is guided by sliding.

(8) The heating device according to any one of (1) to (5), wherein the heating portion is fixedly supported in a state of being in contact with the exciting coil.

(9) The moving body is a sleeve-like rotating body or an end member that travels and moves (1)
The image heating apparatus according to any one of (8) to (8).

(10) The heating device according to any one of (1) to (9), characterized in that the image carried on the recording material is heat-treated.

(11) An image forming means for carrying a developer image on a recording material, and heat treatment of the developer image carried on the recording material (1) to (9) An image forming apparatus, comprising: the heating device described in 1).

[0028]

That is, without providing a special member as a moving conductive member or a guide member for the fixing film, the exciting coil is made as close as possible to the guide member and the exciting coil and the conductive member, and the magnetic flux generated by the exciting coil is generated. By making it possible to efficiently insert into the conductive member, the efficiency of heat generation with respect to the input voltage is improved or the device is simplified.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment (1) Overall Configuration of Image Forming Apparatus FIG. 13 is a sectional view of an electrophotographic color printer using the present invention. Reference numeral 101 denotes a photoconductor drum made of an organic photoconductor or an amorphous silicon photoconductor, 102 denotes a charging roller for uniformly charging the photoconductor drum 101, 11
Reference numeral 0 denotes a laser optical box that converts a signal from an image signal generator (not shown) into ON / OFF of laser light and forms an electrostatic latent image on the photosensitive drum 101. Reference numeral 103 denotes a laser beam from the laser optical box 110, which is deflected by an optical deflector (not shown) to optically scan the surface of the photosensitive drum. A mirror 109 bends the optical path of the laser beam 103. The electrostatic latent image on the photosensitive drum 101 is visualized by selectively attaching toner by the developing device 104. Developing device 1
Reference numeral 04 includes a color developing device for yellow Y, magenta M, and cyan C and a developing device Bk for black, which develops the latent image on the photosensitive drum 101 one by one, and transfers the toner image onto the intermediate transfer drum 105. To obtain a color image. The intermediate transfer body drum 105 has an elastic layer having a medium resistance and a surface layer having a high resistance on a metal drum, and applies a bias potential to the metal drum to transfer a toner image by a potential difference from the photosensitive drum 101. . On the other hand, the recording material P sent from the paper feed cassette by the paper feed roller is transferred to the transfer roller 10 so as to be synchronized with the electrostatic latent image on the photoconductor drum 101.
6 and the intermediate transfer drum 105. The transfer roller 106 transfers a toner image on the intermediate transfer body drum 105 onto the recording material by supplying an electric charge having a polarity opposite to that of the toner from the back surface of the recording material P. In this way, the recording material P on which the unfixed toner image is placed is subjected to heat and pressure by the heat fixing device 100 to be permanently fixed on the recording material,
The paper is discharged to a paper discharge tray (not shown). Photoconductor drum 1
The toner and paper dust remaining on 01 are removed by the cleaner 107, the toner and paper dust remaining on the intermediate transfer drum 105 are removed by the cleaner 108, and the photosensitive drum 101 repeats the steps after charging (2 ) Overall Configuration of Image Heating Device (Heating Device) (FIG. 1) The image heating device in the present embodiment will be described below.

FIG. 1 is a sectional view of a fixing device as an image heating device according to the present invention. Reference numeral 20 denotes an exciting coil (coil unit), which has a heat-resistant winding (coil) 20-1, a high magnetic permeability core 40, a holding member 20-2 made of a liquid crystal polymer for holding the coil 20-1, and the like. doing.

The high-permeability core 40 of the exciting coil 20 is preferably made of a material such as ferrite or permalloy that is used for the core of a transformer, and more preferably ferrite with a low loss even at 100 kHz or higher. Further, an exciting circuit is connected to the coil 20-1, and this circuit 21 can generate a high frequency of 20 kHz to 500 kHz by a switching power supply.

Reference numeral 10 denotes a fixing film, which has a cylindrical shape elongated in the direction perpendicular to the plane of the drawing in FIG. The fixing film 10 includes a heat generating layer 10-1, which is a conductive heat generating portion, an elastic layer 10-2, and a release layer 10-3.
It is a laminated member having.

Reference numeral 30 denotes a pressure roller (pressure member), which is a cored bar 30-2 made of iron or the like, and a silicon rubber layer 30-1 formed on the outer peripheral surface of the cored bar 30-2 with a thickness of 3 mm. , A thermistor 30-3 for measuring the surface temperature of the pressure roller, and the like. The pressure roller 30 sandwiches the fixing film 10 and is pressed against the coil unit 20 to form a nip portion N. The pressure roller 30 is rotationally driven counterclockwise as indicated by an arrow to introduce the fixing film 10 into the nip portion N. It is driven together with the recording material P or directly. At this time, the lower surface of the exciting coil 20 (the lower surfaces of the coil 20-1 and the core 40) directly presses the fixing film 10 as a film guide to guide the stable conveyance.

A reference numeral 50-1 is long in the width direction of the recording material, and a longitudinal end portion is fixed to a side plate of the apparatus casing or the like to exert a pressure contact force with the end portion of the shaft (core metal 30-2) of the pressure roller 30. The fixed frame 50-2 receives the holding member 20-2 from the frame 50-
1, 50-3 is a high magnetic permeability core 4
0 is a pressure spring for pressing 0 toward the pressure roller 30, and each of these elements 50-1, 50-2, 50-3
The support mechanism 50 for supporting the exciting coil 20 is configured so that the nip portion N is uniformly formed in the longitudinal direction.

The surface of the high-permeability core 40 on the pressure roller side may be thick at the central portion in the axial direction so as to form a uniform nip, or may be upstream or downstream in the rotational direction of the film. It is also possible to form a radius so that the film can rotate smoothly. Furthermore, in order to improve the slidability with the film, polyimide or the like may be coated.

Further, although the holding member 20-2 is fixed in the present embodiment, the holding member 20-2 is not limited to this, and the holding member 20 is fixed to the arm 50-2.
A fine adjustment mechanism at the -2 position may be provided so that the nip width can be adjusted.

Further, FIG. 5 shows the positional relationship of the pressure spring 50-3. The arrow in the figure indicates the direction of the force applied to the high magnetic permeability core 40. Although the high magnetic permeability core 40 is pressed at three locations in the axial direction in the figure, the point of holding may be only one point in the center, or the number of holding points may be increased when a uniform nip is not formed. .

Then, the coil 20 is excited by the exciting circuit 21.
The magnetic flux generated by the current applied to the high permeability core 40
To generate an eddy current in the heat generating layer 10-1 of the fixing film 10. Heat is generated by this eddy current and the specific resistance of the heat generating layer 10-1. Then, in a state in which the rotational peripheral speed of the film 10 is stabilized by the rotation of the pressure roller 30, a recording material P to be image-fixed as a material to be heated between the film 10 in the pressure nip portion N and the pressure roller 30. Is introduced and is nipped and conveyed together with the film 10 in the pressure contact nip portion N, the heat of the heat generating layer 10-1 of the film 10 is transferred to the recording material P via the elastic layer 10-2 and the release layer 10-3.
And the unfixed toner image T on the recording material P is heated and fixed on the surface of the recording material P. Pressure contact nip N
The recording material P that has passed through is separated from the surface of the film 10 and conveyed.

(3) Exciting Coil and Core Shape FIG. 5 is an exploded perspective view schematically showing the structure of the exciting coil 20 of this embodiment.

In order to efficiently absorb the magnetic field generated by the exciting coil 20 in the heat generating layer 10-1 of the fixing film 10, the winding 20-1 and the core 40 of the exciting coil 20 and the heat generating layer 10-of the fixing film 10 are used. The distance from 1 should be as close as possible.

Therefore, in order to increase the region where the core 40 and the winding 20-1 are close to each other, the winding 20-1 and the core 40 also serve as guides for the fixing film 10 as shown in FIGS. did.

As a result, the distance between the core 40 and the winding 20-1 and the heat generating layer 10-1 is reduced, and the magnetic flux absorption efficiency can be increased.

FIG. 2 shows a cross section of the heat resistant electric wire which constitutes the coil 20. Heat resistant wire is super heat resistant wire: PIMK-U / Showa Densen Co., Ltd. 20-1-1 is polyimide, 20-1-2
Is a ceramic, and 20-1-3 is a nickel-plated conductor. 265 degrees (° C) due to this structure
It can withstand high temperatures up to a certain degree and can sufficiently endure rubbing against the heat generating layer 10-1.

(4) Concerning the constitution of the fixing film (FIG. 3) The conductive heat generating layer 10-1 of the fixing film 10 may be made of a non-magnetic metal, but more preferably nickel, iron or magnetic stainless steel having a good magnetic flux absorption. A metal such as cobalt-nickel alloy is preferable. The thickness thereof is preferably thicker than the skin depth expressed by the following formula and 200 μm or less. The skin depth σ [m] is the frequency f [Hz] of the alternating magnetic field (current applied to the coil 20-1), the magnetic permeability μ, and the specific resistance ρ.
[Ωm] is expressed as σ = 503 × (ρ / fμ) ^1/2 .

This shows the depth of absorption of electromagnetic waves used in electromagnetic induction. At deeper points, the intensity of electromagnetic waves is 1 / e or less, and conversely, most of the energy reaches this depth. Is absorbed by (Fig. 4).

If the thickness of the heat generating layer 10-1 is smaller than 1 μm, most of the electromagnetic energy cannot be absorbed, resulting in poor efficiency. Further, if the heat generating layer 10-1 exceeds 100 μm, the rigidity becomes high. Further, if it exceeds 200 μm, the rigidity becomes too high and the flexibility deteriorates, so that it is not practical to use it as a film-shaped member. Therefore,
The heating layer 10-1 preferably has a thickness of 1 to 100 μm.

Numeral 10-2 is a material such as elastic layer silicone rubber, fluororubber, fluorosilicone rubber, etc. having good heat resistance and good thermal conductivity.

The elastic layer 10-2 has a thickness of 10 to 1000 μm.
m is preferred. The thickness of the elastic layer 10-2 is necessary to guarantee the fixed image quality.

When a color image is printed, a solid image is formed over a large area on the recording material P, especially for a photographic image. In this case, if the heating surface (release layer 10-3) cannot follow the unevenness of the recording material P or the unevenness of the toner layer, heating unevenness occurs, and uneven glossiness occurs in the image in a portion where the heat transfer amount is large and a portion where the heat transfer amount is small. (The part with high heat transfer has high gloss, and the part with low heat transfer has low gloss). Therefore, if the thickness of the elastic layer 10-2 is 10 μm or less, the unevenness of the image gloss may occur because the unevenness of the recording material or the toner layer cannot be followed. Further, the elastic layer 10-2 is 100
If it is 0 μm or more, the thermal resistance of the elastic layer becomes large, and it becomes difficult to realize quick start. More preferably, the elastic layer 10-2 has a thickness of 50 to 500 μm.

If the hardness of the elastic layer 10-2 is too high, the unevenness of the recording material or the toner layer cannot be fully followed and uneven image gloss occurs. Therefore, the hardness of the elastic layer 10-2 is 60 ° (JIS-A) or less, more preferably 45 ° (JIS-A) or less.

The thermal conductivity λ of the elastic layer 10-2 is 6 × 10 ^-4.
２2 × 10 ⁻³ [cal / cm · sec · deg. ] Is good. Thermal conductivity λ is 6 × 10 ⁻⁴ [cal / cm · sec ·
deg. ], The thermal resistance is large, and the temperature rise in the surface layer of the fixing film becomes slow. The thermal conductivity λ is 2 × 10 ⁻³ [cal / cm · sec · deg. ]
If it is larger than the above range, the hardness becomes too high or the compression set deteriorates. Therefore, the thermal conductivity λ is 6 × 10 ^-4 ~
2 × 10 ⁻³ [cal / cm · sec · deg. ] Is good. More preferably, 8 × 10 ^{−4 to} 5 × 10 ⁻³ [cal /
cm · sec · deg. ] Is good.

Numeral 10-3 is a release layer, and a material having a good releasability and heat resistance such as fluororesin, silicone resin, fluororesin silicone rubber, fluororubber, silicone rubber, PFA, PTFE, FEP, etc. is selected.

The thickness of the release layer 10-3 is preferably 1 × 100 μm. When the thickness of the release layer 10-3 is less than 1 μm, there arises a problem that a part having poor releasability is formed due to coating unevenness of the coating film or durability is insufficient. In addition, the release layer is 1
If it exceeds 00 μm, there is a problem that heat conduction deteriorates, and especially in the case of a resin-based release layer, the hardness becomes too high,
The effect of the elastic layer 10-2 is lost.

(5) Pressure Roller 30 is a pressure roller which is formed by coating the core metal 30-2 with the silicone rubber 30-1 as an elastic layer, fluororubber and the like. The pressure roller is driven by a drive mechanism (not shown).

As described above, in the present embodiment, the winding 20-1 and the core 4 are
Since 0 itself also serves as a guide for the fixing film 10, the magnetic field generated by the exciting coil 20 can be put into the fixing film most efficiently. As a result, a high heat generation amount can be obtained with a small input power, and the fixing property is improved. Furthermore, it was possible to provide an image heating device capable of quick start while maintaining high image quality without causing uneven image gloss.

<Second Embodiment> FIG. 6 shows another embodiment. In this embodiment, the fixing film 10 has a layer structure in which an insulating and heat insulating layer 10-4 is provided as shown in FIG. As the insulating and heat insulating layer 10-4, fluororesin polyimide resin, polyamide resin, polyamideimide resin, PE
EK resin, PES resin, PPS resin, PFA resin, PT
A heat-resistant resin such as FE resin or FEP resin is preferable. The thickness of the insulating and heat insulating layer 10-4 is preferably 10 to 1000 μm. When the thickness of the insulating and heat insulating layer 10-4 is smaller than 10 μm, the heat insulating effect and durability are insufficient. On the other hand, when the thickness exceeds 1000 μm, the distance from the high-permeability core 40 to the heat generating layer 10-1 increases, and the magnetic flux is sufficiently generated.
It is no longer absorbed by 0-1.

When the insulating heat insulating layer 10-4 is provided, the heat generated in the heat generating layer 10-1 can be insulated so as not to go to the inside of the fixing film. The efficiency of heat supply to the recording material P side is improved.
Therefore, power consumption can be suppressed. Further, if the electric wire holding member 20-2 is made of insulating heat resistant resin, the electric wire 20-1 may be a bare copper wire as shown in FIG. 7, and in this case, the cost of the electric wire can be significantly reduced.

<Embodiment 3> FIG. 9 shows a fixed heat generating portion 20.
-3, the winding 20-1 also serves as a guide for the fixing film 10. In this case, the fixing film 1
Since 0 does not need to have a heat generating layer, the release layer 10-3 may be provided on the base layer 10-5 made of polyimide or the like. Further, in the winding 20-1, the holding guide 20-2 has insulation heat resistance, and the surface of the heat generating portion 20-3 is subjected to insulation treatment.
If it is sufficiently separated from the heat generating portion 20-3, it is possible to use a bare copper wire as shown in FIG. 10, and it is possible to significantly reduce the cost of the wire member.

<Embodiment 4> In this embodiment, as shown in FIG. 11, the exciting coil 20 is arranged in the pressure roller 30. This is a pressure roller core metal 3 made of iron, etc.
0-2 is for heating the pressure roller 30 directly by the eddy current induced in the core metal 30-2 of the pressure roller by the magnetic field generated by the exciting coil 20.

The magnetic field generated by the exciting coil 20 is applied to the core metal 30.
In order to efficiently absorb −2 in −2, the distance between the exciting coil 20 and the core metal 30-2 should be as short as possible. Therefore, the heat resistant winding as shown in FIG. 12 is arranged so as to directly contact the core metal 30-2 of the pressure roller 30.

As a result, the temperature drop of the pressure roller during continuous printing can be prevented.

Although the exciting coil 20 is provided with a core in FIG. 11, the core may be omitted if sufficient heat generation is possible. By not providing the core, the cost can be reduced by the amount of the core.

Furthermore, the film 10 and the pressure roller 30 can be heated in a short time, and the printing speed can be increased. Further, the fixing film 10 and the pressure roller 3
By separately controlling the heat generation amount of 0, the fixing temperature can be controlled according to the type of medium.

<Others>. In the above-described embodiment, as shown in FIG.
Although the -1 windings are arranged in two rows, the windings may be wound in one row or in two or more rows. . Although the film 10 is driven by the pressure roller 30 in the above embodiment, the film 10 may be driven by a driving roller by applying tension to the film 10 by a tension roller. However, it can be implemented. . Instead of the film 10, a metal roller may be used. . In the above-described embodiment, since the toner containing the low-softening substance is used as the toner T, the heating fixing device is not provided with the oil application mechanism for preventing the offset, but the toner containing no low-softening substance is used. In some cases, an oil application mechanism may be provided. Further, a cooling unit may be provided after the fixing nip to perform cooling separation. Also, when a toner containing a low softening substance is used, oil application or cooling separation may be performed. . Although the four-color image forming apparatus has been described in the above embodiment, it may be applied to a monochrome or one-pass multi-color image forming apparatus. In this case, the elastic layer 10-2 may be omitted in the fixing film 10. . The heating device of the present invention is not limited to an image heating and fixing device, and for example, a device that heats a recording material carrying an image to modify the surface property of gloss, a hypothetical wearing device, etc. It can be used as a means / apparatus for heating the heating material.

[0065]

As described above, according to the present invention,
Since the exciting coil guides the movement of the moving body, the device can be simplified, and the exciting coil guides the movement of the moving body including the heat generating portion or the heat generating portion is brought into contact with the exciting coil. With the fixed support, the efficiency of heat generation with respect to the input voltage can be improved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a heating device used in an image forming apparatus of the present invention.

FIG. 2 is a schematic cross-sectional view of a winding used in the first embodiment.

FIG. 3 is a schematic cross-sectional view of a fixing film used in Embodiment 1.

FIG. 4 is a graph showing the relationship between the heat generation layer depth and the electromagnetic wave intensity.

FIG. 5 is an exploded perspective view of an exciting coil used in the first embodiment.

FIG. 6 is a schematic sectional view of a heating device according to a second embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of a winding used in the second embodiment.

FIG. 8 is a schematic sectional view of a fixing film used in Embodiment 2.

FIG. 9 is a schematic cross-sectional view of a heating device according to a third embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view of a winding used in the third embodiment.

FIG. 11 is a schematic sectional view of a heating device according to a fourth embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view of a winding used in the fourth embodiment.

FIG. 13 is a schematic configuration diagram of an example of an image forming apparatus according to the present invention.

FIG. 14 is a schematic cross-sectional view of a conventional film-type electromagnetic heating type heating device.

[Explanation of symbols]

 10-1 Heat-generating layer 10-2 Elastic layer 10-3 Release layer 10-4 Insulating layer 10 Fixing film 40 High permeability core 20 Excitation coil 30 Pressure roller

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tetsuya Sano 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Koichi Tanigawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Within the corporation

Claims (11)

[Claims] 1. An electromagnetic induction for heating a material to be heated which is moved together with a moving body by causing a magnetic field generated by an exciting coil to act on a conductive heat generating portion to generate an induced current and causing the heat generating portion to generate heat by the induced current. In a heating type heating device, the moving body is guided by the exciting coil to move. 2. An exciting coil that causes a magnetic field to act on a conductive heat generating portion to generate an induced current, and heats the heat generating portion by the induced current, a moving body, and an exciting coil that sandwiches the moving body. An electromagnetic wave having a heating body that is pressed into contact with the moving body and introducing a material to be heated between the moving body and the pressing member in the pressure contact portion to move the material along with the moving body while applying heat to the heat generating portion. An induction heating type heating device, wherein the moving body is guided and moved by the exciting coil. 3. The pressing member has a hollow roller having a heat generating portion and an exciting coil supported in contact with the inner peripheral surface of the hollow roller, and the magnetic field generated by the exciting coil is provided in the heat generating portion. The heating device according to claim 2, wherein the heating member is heated by the induction current to generate an induction current, and the induction current causes the heating portion to generate heat. 4. The heating device according to claim 1, wherein a coil forming an exciting coil guides the moving body. 5. The heating device according to claim 1, wherein the coil forming the exciting coil is covered with an insulating layer. 6. The heating device according to claim 1, wherein the moving body is a laminated member including the heat generating portion as a heat generating layer, or the moving body itself is a heat generating portion. 7. A heat-generating layer, which is the heat-generating portion, of the moving body,
A laminated member including an insulating layer on the side of the excitation coil of the heating layer, wherein the insulating layer and a bare wire forming the excitation coil slide to guide movement of the moving body. The heating device according to any one of claims 1 to 4. 8. The heating device according to claim 1, wherein the heat generating portion is fixedly supported in a state of being in contact with the exciting coil. 9. The heating device according to claim 1, wherein the moving body is a sleeve-like rotating body or an end member that travels and moves. 10. The heating device according to claim 1, wherein the image carried on the recording material is heat-treated. 11. The image forming means for carrying a developer image on a recording material, and the developer image carried on the recording material, which is heat-treated. An image forming apparatus comprising: a heating device.