JP2001118670A - Electromagnetic induction heater and picture recorder using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electromagnetic induction heater with a simple structure which enables effective cooling of a magnetic core and an exciting coil and realizes a small size of the apparatus. SOLUTION: The electromagnetic induction heater 2 to heat the heated object 1 with an electromagnetic induction heating layer 1b is installed with a magnetic core 3 composed of a magnetic material and arranged opposite to the heating layer 1b of the heated object 1, the exciting coil 4 winding the magnetic core 3 to generate a variable magnetic field H penetrating the heating layer 1b, and a stand 5 provided with a radiating channel 6 to support the magnetic core 3 and the exciting coil 4. The heater 2 is installed with an air blast mechanism 7 and a radiation material 8 if necessary. The invention also provides a picture recorder which comprises the heater 2 with the heated object 1 as a picture carrier and a fixation tool 12 to transfer and fix an unfixed picture heated and molten by the heater 2 to a recording material 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction heating device utilizing electromagnetic induction and an improvement of an image recording apparatus using the same.

[0002]

2. Description of the Related Art Conventionally, this type of electromagnetic induction heating device is used, for example, in a fixing device of an image recording apparatus.
As this type of fixing device, a fluctuating magnetic field generating unit is incorporated in a fusing roll (a body to be heated), which is an electromagnetic induction heating member, and an alternating magnetic field of the fluctuating magnetic field generating unit is caused to act on the fixing roll. Heating an unfixed toner image on a recording material is known. Here, as the fluctuating magnetic field generating unit, a magnetic core such as a ferrite core arranged along the axial direction of the fixing roll,
An exciting coil wound around the magnetic core and generating a fluctuating magnetic field that penetrates the fixing roll in the radial direction, and a fluctuating magnetic field generated by feeding power to the exciting coil is used. .

[Problems to be solved by the invention]

However, in this type of electromagnetic induction heating apparatus, when power is supplied to the exciting coil, the exciting coil inevitably generates heat. For example, the ferrite core, which is a magnetic core, exceeds the Curie point due to heat generation. There are concerns. In such a situation, the magnetic permeability of the ferrite core is reduced, and the magnetic flux density is correspondingly reduced, so that there is a technical problem that the temperature distribution of the object to be heated is affected accordingly.

In order to solve such a technical problem, for example, a fluctuating magnetic field generating unit (magnetic core and exciting coil)
There is a technology in which the heat generating coil is disposed so as to protrude outside from both ends of the fixing roll by extending the fixing coil in the axial direction, and to release the heat of the exciting coil from both ends of the fluctuating magnetic field generating unit (for example, 9-197850). However, in this type of electromagnetic induction heating device, the axial length of the fluctuating magnetic field generation unit must be set longer with respect to the object to be heated, and the electromagnetic induction heating device becomes larger accordingly. Is not preferred.

On the other hand, a hollow bobbin, which is a magnetic core, is fixedly arranged in a fixing roll, an exciting coil is wound around the bobbin, and a blower fan is provided in the bobbin to prevent the temperature of the exciting coil from rising. There is a technique (for example, see Japanese Patent Application Laid-Open No. 10-282826). However, in this type of electromagnetic induction heating device, a configuration in which a blower fan is provided in a bobbin provided in a fixing roll and the bobbin is used as a wind guide tube not only complicates the configuration. However, there is a restriction that the roll diameter of the fixing roll must be increased, which is not preferable in that the degree of freedom in design is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and has a simple structure, which can efficiently cool a magnetic core and an exciting coil and can reduce the size of an apparatus. Provided are an electromagnetic induction heating device and an image recording device using the same.

[0007]

That is, according to the present invention, as shown in FIG. 1A, at least the electromagnetic induction heating layer 1b is provided.
Induction heating device 2 for heating an object to be heated 1 provided with
, A magnetic core 3 made of a magnetic material facing the electromagnetic induction heating layer 1b of the heated body 1 and a fluctuating magnetic field H wound around the magnetic core 3 and penetrating the electromagnetic induction heating layer 1b are generated. An electromagnetic induction heating apparatus comprising: an excitation coil 4; and a heat-resistant pedestal 5 supporting the magnetic core 3 and the excitation coil 4 and having a heat radiation passage 6.

In such technical means, the electromagnetic induction heating apparatus 2 of the present invention can heat all the objects to be heated 1 having the electromagnetic induction heating layer 1b. Here, the electromagnetic induction heating layer 1b generates an eddy current Ic by a fluctuating magnetic field H generated from the exciting coil 4, and generates the eddy current Ic.
As long as it generates heat (Joule heat) due to c, the conductive metal and the like may be selected as appropriate. The shape of the heated object 1 is also arbitrary such as a belt shape and a drum shape, and the application of the heated object 1 is mainly used in an image recording apparatus for melting a toner image or the like. Other devices may be appropriately selected.

Further, the magnetic core 3 may be appropriately selected from ferrite as long as it has magnetism. However, in consideration of heat generated by the fluctuating magnetic field H and the frequency of the exciting coil 4, it is preferable to use ferrite. . Furthermore, the magnetic core 3 may have a single block configuration. However, when the electromagnetic induction heating device 2 is of a long form, the magnetic core 3 is formed of a plurality of cores in consideration of ease of manufacture. It is preferable that the block is formed in a divided form and the blocks are arranged in parallel to form a long form. Although the shape of the magnetic core 3 may be appropriately selected, the generated fluctuating magnetic field H is concentrated and led to the electromagnetic induction heating layer 1b side of the object 1 to be heated, and the fluctuating magnetic field H H is prevented from being released as much as possible, for example, a magnetic path forming member is provided on the back side of the pedestal 5 supporting the magnetic core 3 and the exciting coil 4, or the shape of the magnetic core 3 is changed to the electromagnetic induction heating layer 1b.
It is preferable to adopt a configuration in which an E-shaped cross section is formed so as to face the opening, the excitation coil 4 is wound around the central core, and the peripheral core functions as a shield wall.

The winding method of the exciting coil 4 may be appropriately selected. For example, in a mode in which the magnetic core 3 is constituted by a plurality of core blocks, the exciting coil 4 may be wound for each block. No, but exciting coil 4
From the viewpoint of further simplifying the configuration of the excitation circuit for controlling energization of the core block, it is preferable that the winding is performed over at least two or more core blocks.

The shape of the pedestal 5 is not particularly limited, such as a plate shape or a block shape, but is preferably a plate shape in consideration of the thinness of the electromagnetic induction heating device 2 itself. The heat radiation path 6 provided in the pedestal 5 may be any path configuration for dissipating heat from the magnetic core 3 and the exciting coil 4.
An appropriate number of heat-dissipating holes that penetrate the pedestal 5 may be used, a mesh-shaped heat-dissipating opening may be used, or a heat-dissipating groove formed on the surface of the pedestal 5 may be used.

Further, in the present invention, as a mode for further promoting the heat radiation, as shown by a phantom line in FIG. 1A, an air blowing mechanism 7 for further promoting the heat radiation from the heat radiation passage 6 is provided. An embodiment is mentioned. Here, as the blowing mechanism 7, not only a mode in which a dedicated cooling fan is provided, but also a mode in which an existing ventilation blower is used, a duct is provided between the electromagnetic induction heating device 2 and the ventilation blower, and ventilation is performed. This includes a mode in which ventilation is performed by a blower. Further, as another mode for further promoting heat radiation, a mode in which a heat dissipating member 8 for promoting heat radiation is provided. Here, as the heat dissipating member 8, any structure and arrangement may be appropriately selected as long as it is a functional member for dissipating heat from the heat dissipating passage 6, but for example, a heat dissipating fin structure is preferable. Note that both of these functional elements 7,
Of course, 8 may be provided at the same time.

An image recording apparatus according to the present invention using the electromagnetic induction heating device 2 has an electromagnetic induction heating layer 1b and carries an unfixed image T as shown in FIG. Carrier 10 as an object to be heated 1, image forming means 11 for forming an unfixed image T carried on image carrier 10, and a direction orthogonal to the moving direction of image carrier 10 And the image carrier 10 is electromagnetically heated by heating the image carrier 10 so as to face the image carrier 10.
An electromagnetic induction heating device 2 that melts the unfixed image on the image carrier 0 and an unfixed image that is disposed downstream of a portion of the image carrier 10 that faces the electromagnetic induction heating device 2 and that is fused on the image carrier 10. Fixing means 12 for transferring and fixing image T on recording material 13
And characterized in that:

In such an image recording apparatus, as the image carrier 10, an unfixed image T heated by the electromagnetic induction heating device 2 and heated and melted is used as the recording material 13.
From the viewpoint of easily transferring to the side, the one provided with a base layer, an electromagnetic induction heating layer 1b laminated on the base layer, and an elastic release layer laminated on the electromagnetic induction heating layer 1b preferable. In this case, the elastic release layer may have a mode in which a release layer is laminated on the surface of the elastic layer, or a mode in which the release layer itself has elasticity.

The image carrier 10 may be constituted as an intermediate transfer member, or may be an image carrier (ionography, xerography) on which a latent image is formed and developed on the outer surface. You can also.

As the fixing means 12, any means may be used as long as it presses the unfixed image T fused by the electromagnetic induction heating device 2 against the recording material 13 and transfers and fixes the unfixed image T to the recording material 13. You can choose it. Therefore, the fixing unit 12 used in the image recording apparatus of the present invention may be a so-called pressurizing device, but from the viewpoint of correcting the heating pattern by the electromagnetic induction heating device 2, for example, the recording material 1
A configuration may be adopted in which a heating source for heating in a range substantially corresponding to the size of 3 is built in.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. Embodiment 1 FIG. 2 shows Embodiment 1 of an image recording apparatus to which the present invention is applied.
FIG. In the figure, reference numeral 21 denotes a photosensitive drum (latent image carrier) rotating in the direction of an arrow, for example.
Is a charger such as a corotron for charging the photosensitive drum 21 in advance, and 23 is a photosensitive drum 2 based on each color component image information.
An exposure device such as a laser scanning device (ROS) for writing an electrostatic latent image corresponding to each color component on 1; 24 corresponds to each color of yellow (Y), magenta (M), cyan (C) and black (K) Developing units 24Y, 24M, 24
C and 24K are rotary (rotary) developing devices mounted on a rotary holder, and develop the electrostatic latent image formed on the photosensitive drum 21 by any of the developing units 24Y to 24K to form a toner image of each color component. Is formed. Also,
Reference numeral 25 denotes a drum cleaner that removes residual toner on the photosensitive drum 21 as waste toner.

Reference numeral 30 denotes an intermediate transfer belt disposed so as to be in contact with the surface of the photosensitive drum 21;
A plurality (for example, four in this embodiment) of rolls 31 to 3
4 so as to rotate in the direction of the arrow.
Further, at a portion (primary transfer position) of the intermediate transfer belt 30 facing the photosensitive drum 21, the intermediate transfer belt 30
A primary transfer device (primary transfer roll in the present embodiment) 26 is disposed on the back side of the primary transfer roll 2.
6 is applied with a voltage having a polarity opposite to the charging polarity of the toner, the toner image on the photosensitive drum 21 is transferred to the intermediate transfer belt 3.
It is designed to be electrostatically attracted to zero.

Here, the stretching rolls 31 to 34 of the intermediate transfer belt 30 used in the present embodiment will be described. Reference numeral 31 denotes a driving roll provided near the upstream side of the primary transfer portion by the primary transfer roll 26; Is a driven roll provided on the downstream side of the primary transfer portion, 33 is a tension roll provided on the downstream side of the driven roll 32 to apply a predetermined tension to the intermediate transfer belt 30, and 34 is a fixing as a secondary transfer portion described later. The counter roll (backup roll) is one element of the device 40. Reference numeral 35 denotes a belt cleaner that is disposed opposite to the portion where the drive roll 31 is provided and cleans the surface of the intermediate transfer belt 30.

In the present embodiment, the fixing device 4
Numeral 0 indicates that the fused toner image T on the intermediate transfer belt 30 is transferred and fixed to a sheet P as a recording material as shown in FIG. And an opposing roll 34 disposed opposite to the pressure roll 41 from the back side of the intermediate transfer belt 30.
Reference numeral 42 denotes an entrance-side guide chute for guiding the paper P to the secondary transfer unit, and 43 denotes a paper P on which the toner image T is transferred and fixed.
4 is an exit-side guide chute for guiding (shown by a virtual line in FIG. 3).

Further, in the present embodiment, an electromagnetic induction heating device 50 is provided upstream of the fixing device 40 of the intermediate transfer belt 30. This electromagnetic induction heating device 50
As shown in FIG. 3, the intermediate transfer belt 30 is used as a member to be heated, and the back side or the front side (see FIG.
In this example, the fluctuating magnetic field generating unit 51 is disposed. Here, as shown in FIG. 3, for example, the intermediate transfer belt 30 includes a base layer 30a formed of a sheet member having high heat resistance, a conductive layer (electromagnetic induction heating layer) 30b laminated thereon, and an uppermost layer. Surface release layer 30c
And three layers. The base layer 30a is preferably a semiconductive member. For example, a material in which a conductive material such as carbon black is dispersed in a resin having high heat resistance represented by polyester, polyethylene terephthalate, polyimide, or the like is suitably used. . The conductive layer 3
0b is a metal layer formed of, for example, copper, nickel, chromium, or the like with a predetermined thickness by, for example, an etching process. Furthermore, the surface release layer 30c is preferably a sheet or a coat layer having a high release property, for example, a tetrafluoroethylene-perfluoroalkylvinyl ether polymer, a polytetrafluoroethylene-silicone copolymer, or a fluorine resin, Silicone resin, fluorosilicone rubber, fluorine rubber, silicone rubber, PFA, PTF
E, FEP, etc. are used. Here, the surface release layer 30
When the material of c is made of an elastic material, it adheres in a state of enclosing the toner, and is therefore preferable in that the image is less deteriorated and the image gloss is uniform.

On the other hand, the fluctuating magnetic field generation unit 51
As shown in FIGS. 5A to 5C and FIG. 5, a non-magnetic long plate-shaped pedestal 52 arranged in a width direction orthogonal to the conveyance direction of the intermediate transfer belt 30 and this pedestal 52 A magnetic core 53 such as ferrite disposed thereon, and an exciting coil 54 wound around the magnetic core 53 to generate a fluctuating magnetic field penetrating in the thickness direction of the intermediate transfer belt 30.
A fluctuating magnetic field is generated by supplying a high-frequency current to the exciting coil 54 by an exciting circuit (not shown). Here, as the pedestal 52, a heat-resistant resin such as heat-resistant glass or polycarbonate is used. In this pedestal 52, as shown in FIG. There are several establishments. As a specific example, for example, the plate thickness is 5 mm and the length and width are 370
In a base made of polycarbonate having a size of 40 mm, heat radiation holes having a diameter of 5 mm are provided in four rows and 19 rows. Also,
The magnetic core 53 may be formed of a single block body, but a plurality (five in this example) of core blocks 53a to 53e are arranged in a line in consideration of manufacturability such as sintering. Has been adopted. The exciting coil 54 is a magnetic core 53 (five core blocks 53a to 53a in this example).
3e) (whole set).

Further, in the present embodiment, a cooling fan 71 is provided on one side in the longitudinal direction of the rear surface of the pedestal 52, and the cooling fan 71 blows air along the rear surface of the pedestal 52, and The released heat is blown off from the back of the pedestal 52. Furthermore, in the present embodiment,
A plurality of ferrite magnetic bars 72 are arranged on the back surface of the pedestal 52 along the width direction of the pedestal 52. As shown in FIG. It is formed integrally.

Further, in the present embodiment, the paper transport system
The paper P is conveyed from the paper tray 60 toward a predetermined conveyance path 65 by a feed roll 61, and once stopped by a registration roll (registration roll) 62 to a fixing position at a predetermined timing. The sheet P is transported, and the sheet P after fixing is transported and discharged to a discharge tray 63 or 64 via a predetermined transport path. Reference numeral 66 denotes a transport roll provided in the transport path.

Next, the operation of the image recording apparatus according to this embodiment will be described. The photoconductor drum 21 rotates in the direction indicated by the arrow in FIG. 2, is uniformly charged by the charger 22, and is irradiated with a beam corresponding to a predetermined color component (for example, yellow) from the exposure device 23, An electrostatic latent image corresponding to a yellow image is formed on the body drum 21. The yellow electrostatic latent image is developed by the yellow developing device 24Y of the rotary developing device 24, and a yellow toner image is formed on the photosensitive drum 21. This yellow toner image is electrostatically transferred onto the intermediate transfer belt 30 by the action of the primary transfer roll 26 at a primary transfer portion that is a contact portion between the photosensitive drum 21 and the intermediate transfer belt 30. The intermediate transfer belt 30 moves around in synchronization with the photosensitive drum 21 and continues to move around while keeping the yellow toner image on its surface, in preparation for the transfer of a magenta image of the next color.

On the other hand, after the surface of the photosensitive drum 21 is cleaned by the drum cleaner 25, the photosensitive drum 21 is charged substantially uniformly again by the charger 22 and irradiated with the beam from the exposure device 23 in accordance with the next magenta image signal. You. The rotary developing device 24 rotates while the magenta electrostatic latent image is formed on the photosensitive drum 21, and the magenta developing device 24M is fixed at the developing position to perform development with magenta toner.
The magenta toner image thus formed is electrostatically transferred on the intermediate transfer belt 30 at the primary transfer section. Subsequently, the above-described processes are performed for cyan and black, respectively, and when the transfer of four colors onto the intermediate transfer belt 30 is completed, or when the transfer of the final color black is completed, the paper is stored in the paper tray 60. The paper P to be fed is fed by the feed roll 61 and the registration roll 62
And is conveyed to the secondary transfer portion of the intermediate transfer belt 30 via the

On the other hand, the four color toner images transferred onto the intermediate transfer belt 30 pass through the heating area of the electromagnetic induction heating device 50 on the upstream side of the secondary transfer portion. In this heating region, the fluctuating magnetic field from the fluctuating magnetic field generation unit 51 penetrates the conductive layer 30b of the intermediate transfer belt 30, and the conductive layer 30b of the intermediate transfer belt 30 generates heat by electromagnetic induction heating. As a result, the conductive layer 30b is rapidly heated, and this heat is transmitted to the surface layer with the passage of time. When the heat reaches the secondary transfer portion, the toner on the intermediate transfer belt 30 is in a molten state. At this time, there is a concern that the magnetic core (the ferrite core in this example) 53 generates heat due to the self-heating of the exciting coil 54, etc. Heat is dissipated to the side. Therefore, the magnetic core 53 does not needlessly generate heat, and there is no concern that the magnetic core 53 generates heat and exceeds the Curie point. Therefore, a situation where the magnetic permeability of the magnetic core is reduced and the magnetic flux density is reduced is effectively avoided, and the temperature distribution of the intermediate transfer belt 30 is kept substantially uniform. Therefore, the toner image on the intermediate transfer belt 30 that has passed through the heating area of the electromagnetic induction heating device 50 is melted with a substantially uniform temperature distribution, and the transferability of the toner image in the secondary transfer portion is improved. It is kept substantially uniform over the width direction of 30.

In the present embodiment, the magnetic bar 7
2 is provided on the back surface of the pedestal 52,
Even if the fluctuating magnetic field from 3 is diverged to a part other than the intermediate transfer belt 30 side, it is captured by the magnetic bar 72 on the back side of the pedestal 52. That is, since the magnetic bar 72 functions as a functional member that forms a magnetic path so that the fluctuating magnetic field does not diverge, the situation where the fluctuating magnetic field generated from the fluctuating magnetic field generation unit 51 is wastefully diverted is effectively avoided.

In particular, in the present embodiment, the heat released from the heat radiating holes 70 of the pedestal 52 is blown off from the back surface of the pedestal 52 by blowing air from the cooling fan 71. Further, the pedestal 52
A part of the heat released from the heat radiating holes 70 is transmitted to the magnetic bar 72 provided on the back surface of the pedestal 52, and the air from the cooling fan 71 blows on the radiating fins 73 of the magnetic bar 72. Accordingly, the magnetic bar 72 functions as a heat radiating member, and the heat transmitted to the magnetic bar 72 is released into the air through the heat radiating fin portion 73. As described above, in the present embodiment, in addition to the heat radiation holes 70, the cooling fans 71
Further, since the magnetic bar 72 is provided as a heat radiating member, the heat radiating effect from the magnetic core 53 and the exciting coil 54 is more excellent.

In the present embodiment, the cooling fan 7
By using an existing ventilation blower instead of 1 and providing a duct between the vicinity of the rear surface of the pedestal 52 and the ventilation blower, air from the ventilation blower may be applied to the vicinity of the rear surface of the pedestal 52. Further, depending on the required heat radiation effect, a mode in which only a heat radiation path such as a heat radiation hole 70 is provided, a mode in which an air blowing mechanism such as a cooling fan 71 is added to the heat radiation path, and a heat radiation member such as a magnetic bar 72 is added to the heat radiation path. The mode and the like can be appropriately selected.

Then, the toner image melted on the intermediate transfer belt 30 is brought into close contact with the paper P by the pressure of the pressure roll 41 of the fixing device 40 which is pressed in contact with the transport of the paper P in the secondary transfer section. . In the heating area of the electromagnetic induction heating device 50, only the vicinity of the surface of the intermediate transfer belt 30 is locally heated, and the molten toner comes into contact with the sheet P at room temperature and is rapidly cooled. That is, when the melted toner passes through the nip of the secondary transfer portion, it instantaneously penetrates the paper P by the thermal energy and the pressing force of the toner and is transferred and fixed. The intermediate transfer belt 30 is conveyed toward the nip exit while removing heat from the heated intermediate transfer belt 30. At this time, since the nip width and the moving speed of the sheet P are appropriately set, the temperature of the toner at the nip outlet becomes lower than the softening point temperature. Therefore, the cohesive force of the toner increases, and the toner image is almost completely transferred and fixed onto the sheet P without causing offset. Thereafter, the paper P on which the toner image has been transferred and fixed is discharged onto the discharge tray 63 or 64 through a predetermined transport path, and the full-color image formation is completed.

[0032]

As described above, according to the present invention, a heat radiating passage is provided in a pedestal on which a magnetic core and an exciting coil are supported, and heat generated from the magnetic core and the exciting coil is effectively reduced via the heat radiating passage. The electromagnetic induction heating device for the object to be heated is not unnecessarily large and complicated, and it is possible to effectively suppress the change in the generation amount of the fluctuating magnetic field due to the heat generated by the magnetic core. Accordingly, the heat generation distribution with respect to the object to be heated can be stabilized substantially uniformly.
Further, the image recording apparatus according to the present invention has high reliability and compactness by using an electromagnetic induction heating apparatus having a small and simple configuration and capable of uniformly heating an object to be heated. It is possible to provide an image recording apparatus having a simple simultaneous transfer and fixing mode.

[Brief description of the drawings]

FIG. 1A is an explanatory diagram showing an outline of an electromagnetic induction heating device according to the present invention, and FIG. 1B is an explanatory diagram showing an outline of an image recording apparatus using the electromagnetic induction heating device according to FIG. .

FIG. 2 is an explanatory diagram illustrating an overall configuration of an embodiment of an image recording apparatus to which the present invention has been applied.

FIG. 3 is an explanatory diagram showing an electromagnetic induction heating device used in the present embodiment.

FIG. 4A is a view as seen from an IV direction in FIG. 3,
(B) is an arrow view as seen from the middle B direction, and (c) is an arrow view as seen from the middle C direction.

FIG. 5 is an exploded view of the electromagnetic induction heating device according to the present embodiment.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heated object, 1b ... Electromagnetic induction heating layer, 2 ... Electromagnetic induction heating device, 3 ... Magnetic core, 4 ... Exciting coil, 5 ... Pedestal, 6
... heat dissipation passage, 7 ... blower mechanism, 8 ... heat dissipation member, T ... unfixed image

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H032 AA05 AA14 AA15 BA09 BA15 BA21 BA23 2H033 BA02 BA07 BA29 BB23 BE06 BE09 2H078 AA29 BB03 CC06 DD03 DD42 DD53 DD57 3K059 AA10 AB00 AB19 AB27 AB28 AC10 AC73 AD03 AD05 AD37 AD28 CD48 CD52 CD73 CD75 CD77 CD79

Claims (5)

[Claims] 1. An electromagnetic induction heating apparatus for heating a body to be heated provided with at least an electromagnetic induction heating layer, comprising: a magnetic core made of a magnetic material disposed to face the electromagnetic induction heating layer of the body to be heated; An exciting coil wound around a magnetic core to generate a fluctuating magnetic field penetrating the electromagnetic induction heating layer, and a heat-resistant pedestal supporting the magnetic core and the exciting coil and provided with a heat dissipation path are provided. Electromagnetic induction heating device. 2. The electromagnetic induction heating device according to claim 1, wherein the magnetic core is a ferrite core. 3. The electromagnetic induction heating device according to claim 1, further comprising a blowing mechanism for promoting heat radiation from the heat radiation passage. 4. The electromagnetic induction heating apparatus according to claim 1, further comprising a heat radiating member for facilitating heat radiation from the heat radiating passage. 5. An image carrier having an electromagnetic induction heating layer and carrying an unfixed image, an image forming means for forming an unfixed image carried on the image carrier, and an image carrier. 2. An unfixed image on the image carrier, which is disposed opposite to the image carrier along a direction perpendicular to the moving direction of the carrier, and which heats the image carrier by electromagnetic induction.
An electromagnetic induction heating device according to claim 1, further comprising: a fixing unit that is disposed at a downstream position of a portion of the image carrier that is opposed to the electromagnetic induction heating device, and that transfers an unfixed image melted on the image carrier to the recording material and fixes the unfixed image onto a recording material. And an image recording apparatus.