JP3737054B2 - Magnetic flux irradiation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic flux irradiating apparatus for generating magnetic flux using a solenoid coil and irradiating an irradiated body with the magnetic flux.
[0002]
[Prior art]
Conventionally, as this kind of magnetic flux irradiation device, there is one used for a living body internal heating device used for local thermotherapy (hyperthermia method), for example. In one method of this hyperthermia method, as disclosed in JP-A-11-57031, a magneto-sensitive heating element mainly composed of fine particles of iron-based oxide is introduced into an affected area of a living body, and is applied by a magnetic flux irradiation device. Magnetic flux is irradiated to the magnetosensitive heating element. The magnetosensitive heating element generates a magnetic hysteresis loss due to the irradiated magnetic flux, and the affected part is locally heated by the magnetic hysteresis loss. This heating is performed at a temperature at which normal cells are not invaded, and only the cancer cells in the affected area are selectively heated and necrotic.
[0003]
FIG. 1 shows a schematic configuration of the action unit 1 of such a magnetic flux irradiation apparatus. The action unit 1 includes a solenoid coil 1a and a magnetic core 1b that are transversely coordinated with a living body that is a subject. When a current is supplied to the solenoid coil 1a from a drive unit (not shown), the living body is irradiated with the magnetic flux 2 from the working end 1z, and the magnetosensitive heating element 3 introduced into the living body is heated. The action end 1z functions with one end of the action part 1 being filled with a transverse configuration in which this end is opposed to a living body.
[0004]
[Problems to be solved by the invention]
Here, it is desirable that the magnetic flux irradiated to the living body reaches the deep portion with a high magnetic flux density even if the portion requiring heating is in the deep portion inside the living body.
[0005]
As a measure for satisfying this requirement, first, in order to increase the density of the magnetic flux 2 output from the working end 1z, (1) the current flowing through the solenoid coil 1a is increased, or (2) the length of the working section 1 is increased. It is conceivable to increase the number of turns of the solenoid coil 1a. Further, in order to increase the output magnetic flux 2, it is conceivable to increase the effective sectional area of the action part 1 (solenoid coil 1a and magnetic core 1b). This measure of (3) is useful for increasing the depth of the magnetic flux 2 reaching the inside of the living body by extending the convective magnetic line pattern drawn by the magnetic flux 2 to a position far from the action end 1z. is there.
[0006]
However, all of the above three measures require an increase in the voltage applied to the solenoid coil 1a. Since this increase in voltage ranges from several kV to several tens of kV, the risk of electric shock is increased, and an undesirable dielectric side effect is caused by a strong electric field, which is not preferable.
[0007]
Furthermore, if it adds to each theory, about the measure of (1) and (2), there exists a limit that the increase in magnetic flux density reaches the peak with the saturation magnetic flux density of the magnetic core 1b. Incidentally, since the magnetic core 1b is often used in a form that does not allow a large margin up to the saturation magnetic flux density, an increase in the magnetic flux density cannot be expected.
[0008]
Further, the measure (2) for increasing the length of the action part 1 has a small contribution effect itself for improving the output magnetic flux density. This is because the portion where the number of turns of the solenoid coil 1a is added is at the end opposite to the working end 1z, and the magnetic field of this portion is the magnetic field strength due to the large magnetoresistance with the working end 1z. This is because it can contribute to the increase in the output of the working end 1z only in a form that is significantly weakened through the lowering.
[0009]
In addition, the measures (2) and (3) involve an increase in circuit impedance that does not contribute to heating, so that the power loss rate increases, and the heating efficiency cannot be improved for the required amount of power. . The measure (3) is the most useful among the above three measures because the amount of saturation magnetic flux increases as the cross-sectional area increases. However, local concentration of magnetic flux seems to be particularly desired. The increase in the magnetic flux thickness may be inconvenient for various applications and purposes.
[0010]
In addition, the increase in the above-described coil application voltage and power loss rate leads to an increase in the scale of the drive unit and the like for causing current to flow through the action unit 1, thereby reducing the portability, operability, and economy of the entire magnetic flux irradiation device. It becomes a negative factor.
[0011]
The present invention has been made in view of the above circumstances, and relates to a magnetic flux irradiating device for generating magnetic flux using a solenoid coil and irradiating the subject with the magnetic flux, and increasing the applied voltage to the coil. The present invention meets the demand for reaching a magnetic flux having a high magnetic flux density to the deep part of the subject without increasing the power loss rate.
[0012]
[Means for Solving the Problems]
In order to meet this requirement, the present invention includes a solenoid coil and an action part having a magnetic core inserted in the solenoid coil, and a drive part that causes a high-frequency alternating current to flow through the solenoid coil to generate a high-frequency alternating current magnetic flux. In a magnetic flux irradiating apparatus in which magnetic flux is irradiated to a magneto-sensitive heating element provided inside the living body from an action end that fills and functions the end, a magnetic flux generating winding that generates a magnetic flux that is applied to the magneto-sensitive heating element. A magnetic flux control winding portion that is formed to project around the action end, and the magnetic flux generation winding portion is composed of a plurality of unit action portions having the same polarity, and each unit action portion Is arranged so that its axis is centripetally gathered on the magneto-sensitive heating element side and the magnetic flux density is added and strengthened, and the magnetic flux control winding part is an envelope of a group of action ends belonging to multiple unit action parts Formed around the periphery It was to Configurations.
[0015]
According to this configuration, the magnetic flux is generated around the working end by the magnetic flux control winding, and the magnetic flux generated at the central axis of the solenoid by the magnetic flux generation winding is affected by the magnetic flux generated by the extension. Forms magnetic field lines that draw an arc at a point farther from the edge. That is, the magnetic flux generated in the axial center portion of the solenoid by the magnetic flux generating winding portion reaches a point farther from the working end and is distributed due to the magnetic flux control effect of the magnetic flux control winding portion.
[0017]
Further , the magnetic flux generated by adding the magnetic fluxes generated in each unit action portion of the plurality of units is irradiated to the magnetosensitive heating element, and the density or thickness is increased as compared with the case where the magnetic flux generated in one unit action portion is irradiated. Magnetic flux is irradiated to the magnetosensitive heating element.
[0019]
Further, the flux control winding unit, occur flux flared periphery wrapping the working end of the unit acting portion of the multiple number groups, flux of each solenoid constructive by adding the effects of the magnetic flux generated overhangs The magnetic field lines that draw an arc at a point farther away from each working end are formed. That is, the magnetic fluxes of the solenoids that are strengthened by addition reach and reach points farther from the action ends.
[0020]
Further, the present invention is characterized in that the magnetic flux control winding portion has a structure in which the shape of the magnetic flux generated by the magnetic flux generation winding portion can be set to a desired distribution .
[0021]
According to this configuration, by setting the shape of the magnetic flux control winding portion in accordance with the shape of the living body , the distribution of magnetic flux generated in the magnetic flux control winding portion can be appropriately changed so that the control effect is further enhanced. .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment in which the magnetic flux irradiation device according to the present invention is applied to a living body internal heating device will be described.
[0023]
The magnetic flux irradiation apparatus according to the present embodiment includes an action unit 11 shown in FIG. 2A and a drive unit 21 shown in FIG.
[0024]
The action part 11 shown to the figure (a) has the magnetic core 11b which consists of a solenoid coil 11a and the ferrite inserted in this. The solenoid coil 11a includes a basic winding portion 11aa wound on the inner peripheral side and substantially the entire length of the action portion 11, and a reinforcing winding wound on the outer side and a short section on the action end 11z side. It has a line part and 11ab. The action end 11z is filled with one end of the action part 11 so as to be transversely coordinated with the subject to function. The magnetic flux 12 generated at the working end 11z of the solenoid coil 11a is irradiated to a living body that is a subject to be irradiated and reaches a magnetosensitive heating element 13 introduced into the living body. The magnetosensitive heating element 13 is mainly composed of iron oxide fine particles having a relative magnetic permeability of 100 to 2000, and the fine particles have an average particle size of 10 to 100 [nm].
[0025]
The drive unit 21 shown in FIG. 6B receives power from an AC power source 22 that generates AC 200 [V], and converts the AC 200 [V] into a pulsating flow 200 [V] by the rectifier 23. The converted pulsating flow 200 [V] is smoothed by the capacitor 24 and converted to a rectangular wave AC 250 [V] by the oscillation device 25. A capacitor 26 is provided on the output side of the oscillation device 25. When the solenoid coil 11a described above is connected to the output terminals 21a and 21b of the drive unit 21, a resonance circuit is formed by the capacitor 26 and the solenoid coil 11a. The Due to the resonance of the resonance circuit, a high-frequency current having a frequency of 50 to 400 [kHz] flows through the solenoid coil 11a, and a magnetic flux 12 is generated at the working end 11z.
[0026]
In this configuration, when the action end 11z of the action part 11 is arranged to face the chest or abdomen of the living body, the magnetic flux 12 generated at the action end 11z is irradiated to the magnetosensitive heating element 13 in the living body. The magnetosensitive heating element 13 causes a magnetic hysteresis loss due to the irradiated magnetic flux 12, and the affected part is heated by this magnetic hysteresis loss. On the other hand, since the living body has good conductivity, an eddy current is generated in the surrounding living body where the magnetosensitive heating element 13 is disposed, and Joule heat is generated. However, since the formation of the alternating magnetic flux 12 having the above-mentioned frequency is concentrated in the arrangement region of the magnetosensitive heating element 13, the heat generation due to the hysteresis loss of the magnetosensitive heating element 13 itself increases and is affected by it and is generated in the surrounding living body. Heat generation due to Joule loss can be suppressed. As a result, a sharp temperature distribution centering on the arrangement area of the magnetosensitive heating element 13 is formed, and only the cancer cells in the affected area are selectively heated and necrotic without causing normal cells to be invaded by heating.
[0027]
From the action end 11z of the action part 11 of the magnetic flux irradiation apparatus according to the first embodiment, the density of the output magnetic flux, which is the sum of the magnetic fluxes derived from each part of the solenoid coil 11a in the graph of FIG. The magnetic flux represented by the line z is output. The horizontal axis of the graph shows the distance L from the working end 11z of the unit winding (one winding) of the solenoid coil 11a, and the vertical axis of the graph shows the magnetic flux density B of the magnetic flux output from the working end 11z. Yes. The characteristic line z is obtained by synthesizing the characteristic line x representing the output magnetic flux derived from the basic winding part 11aa and the characteristic line y representing the output magnetic flux derived from the reinforcing winding part 11ab. According to the action part 11 exhibiting such characteristics, the action end 11z of the action part 11 is added with the magnetic flux generated by the reinforcing winding part 11ab to the magnetic flux generated by the basic winding part 11aa, thereby generating a strong magnetic field. The magnetic flux 12 is efficiently generated.
[0028]
Therefore, the magnetic flux addition action by the magnetic field of the reinforcing winding part 11ab, which is arranged near the action end 11z and has a small attenuation of the magnetic field strength in the magnetic circuit, cannot be achieved by increasing the length of the action part 11. The living body is irradiated with the magnetic flux 12 having a high density.
[0029]
For this reason, according to the magnetic flux irradiation device according to the first embodiment, the magnetic flux 12 having high density is efficiently generated in the living body without generating a high voltage in the resonance circuit of the drive unit 21 and efficiently. Further, the effective depth of the magnetic flux 12 irradiated to the living body (the depth at which the magnetic flux having an effective magnetic flux density acts) can be increased. Moreover, since the action part 11 does not need to enlarge the effective length or enlarge the cross-sectional area, it suppresses the increase in the circuit impedance which does not contribute to heating, and prevents the increase in the power loss rate. I can do it. Furthermore, since the portability of the action part 11 is not impaired, the action end 11z can be easily arranged on a living body part such as a chest or abdomen that requires heating.
[0030]
Next, a second embodiment in which the magnetic flux irradiation device according to the present invention is applied to a living body internal heating device will be described.
[0031]
The magnetic flux irradiation apparatus according to the second embodiment includes an action unit 31 shown in FIG. 3A and a drive unit 21 shown in FIG. 2B. The magnetic flux irradiation according to the first embodiment described above. Only the structure of the action part 31 is different from the apparatus. 3 that are the same as or correspond to those in FIG. 2A are assigned the same reference numerals, and descriptions thereof are omitted.
[0032]
The action part 31 according to the second embodiment is formed by projecting a magnetic flux control winding part 31b hatched in the figure around the solenoid coil 31a of the action end 31z. The magnetic flux control winding portion 31b is formed by winding the winding of the solenoid coil 31a around the working end 31z, and the solenoid coil 31a including the magnetic flux control winding portion 31b is formed from one conductor. Is formed. Note that the magnetic flux control winding portion 31b may be formed by a winding different from the solenoid coil 31a, and an in-phase current may flow through the magnetic flux control winding portion 31b and the solenoid coil 31a.
[0033]
In the magnetic flux irradiating device according to the second embodiment composed of the action part 31 as described above, the magnetic flux 33 is generated around the action end 31z by the magnetic flux control winding part 31b as shown by the dotted line in FIG. The magnetic flux 32 generated in the central portion of the shaft is affected by the magnetic flux 33 generated by overhanging, and forms magnetic field lines that draw an arc at a point farther from the working end 31z. That is, the magnetic flux 32 generated in the axial center portion of the solenoid coil 31a reaches a point farther from the working end 31z and is distributed due to the magnetic flux control effect of the magnetic flux control winding portion 31b.
[0034]
For this reason, even with the magnetic flux irradiation device according to the second embodiment, it is not necessary to increase the voltage of the resonance circuit, and the magnetic flux 32 having a high density can be efficiently concentrated on the in-vivo magneto-sensitive heating element 13. In addition, the effective depth of the magnetic flux 32 applied to the living body can be further increased. Also in this second embodiment, since it is not necessary to increase the size of the action part 31, an increase in circuit impedance that does not contribute to heating is suppressed, and an increase in power loss rate can be prevented. Furthermore, since the portability of the action part 31 is not impaired, the action end 31z can be easily disposed in each part of the living body that requires heating.
[0035]
Next, a third embodiment in which the magnetic flux irradiation device according to the present invention is applied to a living body internal heating device will be described.
[0036]
The magnetic flux irradiation apparatus according to the third embodiment includes an action unit 41 shown in FIG. 3B and a drive unit 21 shown in FIG. 2B. The magnetic flux irradiation according to the second embodiment described above. Only the structure of the action part 41 is different from the apparatus.
[0037]
The action part 41 according to the third embodiment is that the magnetic flux control winding part 41b hatched in the drawing is formed around the solenoid coil 41a of the action end 41z so as to protrude. However, the point that the magnetic flux control winding 41b is formed of a flexible conductive wire is different from the action portion 31 of the second embodiment. In the third embodiment, the winding of the solenoid coil 41a is also formed of a flexible conducting wire, and the magnetic flux control winding portion 41b is wound with the flexible conducting wire protruding around the working end 41z. It is formed. Note that only the magnetic flux control winding portion 41b may be formed from a flexible conductive wire and connected in series with the conductive wire of the solenoid coil 41a. Further, the magnetic flux control winding portion 41b may be formed of a flexible conductive wire different from the solenoid coil 41a, and a current in the same phase may flow through the magnetic flux control winding portion 41b and the solenoid coil 41a.
[0038]
In the magnetic flux irradiating device according to the third embodiment configured as described above, the magnetic flux control winding is performed by bending the shape of the magnetic flux control winding portion 41b in accordance with the shape of the living body 14 as shown in the figure. The distribution of the magnetic flux generated in the line portion 41b can be appropriately changed so that the magnetic flux control effect by the magnetic flux control winding portion 41b is further enhanced. Accordingly, the distribution of the magnetic flux 42 that is affected by the distribution of the magnetic flux and is generated at the axial center portion of the solenoid coil 41a and applied to the living body 14 is changed from the action end 41z by changing the shape of the magnetic flux control winding portion 41b. It is possible to reach a farther point, and to be distributed in an optimal desired state according to the state of the living body 14. Therefore, according to the magnetic flux irradiation apparatus according to the third embodiment, not only the operational effects of the second embodiment described above can be achieved, but also an optimal magnetic flux can be appropriately irradiated according to the condition of the affected area. become.
[0039]
Next, a fourth embodiment in which the magnetic flux irradiation device according to the present invention is applied to a living body internal heating device will be described.
[0040]
The magnetic flux irradiating device according to the fourth embodiment is composed of an action part composed of two unit action parts 51 and 52 shown in FIG. 3C and a drive part 21 shown in FIG. Only the configuration of the drive unit 21 is common to the magnetic flux irradiation apparatus according to the first embodiment described above. In the present embodiment, for convenience of illustration, the action part is composed of two unit action parts 51 and 52, but in practice, if the action part is composed of about three or four unit action parts, The action end of the unit action part is preferably arranged along the outer surface of the three-dimensional subject.
[0041]
In the magnetic flux irradiation apparatus according to the fourth embodiment, the two unit action portions 51 and 52 are arranged with their action ends close to each other as shown in FIG. The solenoid coils are arranged so that the axes of the solenoid coils are concentrated on the subject side in a centripetal manner and the magnetic flux density is added and strengthened. Furthermore, in the fourth embodiment, the magnetic flux control winding portion 53 is formed so as to protrude from the outer periphery that encloses the working ends that are close to each other. In the fourth embodiment, the solenoid coils and the magnetic flux control winding portions 53 of the unit operation portions 51 and 52 are connected in series so that the phases of the magnetic fields generated by them are aligned, and are connected to the drive portion 21 and energized. To do. Accordingly, magnetic fluxes having the same phase are output together at the action ends of the unit action parts 51 and 52, and these are joined and strengthened by the magnetosensitive heating element 13 in the living body. That is, according to the fourth embodiment, heating with a focus on a specific part in the living body can be performed.
[0042]
As described above, even in the present embodiment, it is not necessary to increase the voltage of the circuit, and the high-density magnetic fluxes 54 and 55 can be efficiently concentrated on the in-vivo magneto-sensitive heating element 13. Furthermore, the concentration of the magnetic fluxes 54 and 55 applied to the living body can be improved in the depth direction.
[0043]
Further, in the present embodiment, the magnetic flux control winding portion 53 causes the magnetic flux 56 indicated by the dotted line in the figure to protrude from the outer periphery that wraps the respective action ends of the unit action portions 51 and 52, and adds and strengthens each unit action portion. The magnetic fluxes 54 and 55 of 51 and 52 form magnetic lines of force that draw an arc at points farther from the action ends of the unit action portions 51 and 52 due to the influence of the magnetic flux 56 generated by overhanging. That is, the magnetic fluxes 54 and 55 of the unit action portions 51 and 52 that are strengthened by addition reach and reach points farther from the action ends.
[0044]
For this reason, according to the magnetic flux irradiation apparatus according to the fourth embodiment provided with the magnetic flux control winding part 53, the effective depth of the magnetic fluxes 54 and 55 applied to the living body can be further increased. Further, in the fourth embodiment, when the magnetic flux control winding portion 53 is formed from a flexible conductive wire, the same effects as those of the third embodiment described above are achieved. In addition, although it has the said multiple unit action parts 51 and 52, the structure which is not equipped with the magnetic flux control coil | winding part 53 is useful according to a use and the objective.
[0045]
Moreover, the magnetic flux irradiation apparatus can be configured by appropriately combining the above-described embodiments.
[0046]
For example, in the magnetic flux irradiation apparatus according to the first embodiment whose action part is shown in FIG. 2 (a), the solenoid coil 11a having the basic winding part 11aa and the reinforcing winding part 11ab is further changed to FIG. 3 (a). It can comprise so that the magnetic flux control winding part 31b in 2nd Embodiment in which the action part 31 is shown may be provided. Further, in this case, as in the third embodiment in which the action part 41 is shown in FIG. 3B, the magnetic flux control winding part 31b can be a flexible magnetic flux control winding part 41b. In addition, in the magnetic flux irradiation apparatus according to the fourth embodiment whose action part is shown in FIG. 3C, each of the plurality of unit action parts 51 and 52 is basically the same as the action part 11 of the first embodiment. It can be comprised from the solenoid coil 11a provided with the coil | winding part 11aa and the reinforcement | strengthening coil | winding part 11ab.
[0047]
According to each of these configurations, the action and effect of the combined components are generated in a synergistic manner, and the magnetic flux irradiating device has a higher magnetic flux generation effect than the effect exhibited in each of the above-described embodiments alone Is realized.
[0048]
In each of the above-described embodiments, the case where the magnetic flux irradiation apparatus according to the present invention is applied to the living body internal heating apparatus to irradiate the living body with the magnetic flux has been described, but the present invention is not limited to this. For example, the present invention can be similarly applied to the case of irradiating an object to be irradiated such as metal with magnetic flux and heating the metal or the like. In this case, the same effects as those of the above-described embodiments can be obtained.
[0051]
【The invention's effect】
As described above, according to the present invention, since the action portion includes the magnetic flux control winding portion formed to protrude around the action end, the magnetic flux extends around the action end by the magnetic flux control winding portion. The magnetic flux generated at the center of the solenoid shaft by the magnetic flux generating winding portion reaches a point farther from the working end and is distributed. In addition, the magnetic flux generating winding part is composed of a plurality of unit action parts with the same polarity, and each unit action part is concentrated in a centripetal manner on the magnetosensitive heating element side, and the magnetic flux density is added and strengthened. Therefore, the magnetic flux generated in each unit action part of a plurality of units is irradiated to the magnetosensitive heating element, and the density or thickness is larger than the case where the magnetic flux generated in one unit action part is irradiated. The enhanced magnetic flux is applied to the magnetosensitive heating element. In addition, since the magnetic flux control winding portion is formed so as to protrude around the envelope peripheral edge of the working end group belonging to the plurality of unit action portions, the magnetic flux control winding portion allows the plurality of unit action portions to be The magnetic flux generated by the magnetic flux projecting around the outer periphery surrounding each working end and added and strengthened reaches and distributes to a point farther from each working end. Therefore, without having to high voltage circuits, moreover, efficiently, it is possible to concentrate the dense flux sensitive磁発heat body, further, it Yasu increase the effective depth of the magnetic flux is irradiated to the living body I can do it. Moreover, an increase in the power loss rate can be prevented, and the working end can be easily arranged at a desired position of the living body.
[0054]
Further, when the magnetic flux control winding portion has a structure in which the shape of the magnetic flux generated by the magnetic flux generation winding portion can be set to a desired distribution , the magnetic flux control winding portion is adapted to the shape of the living body . By setting the shape of the line portion, the distribution of magnetic flux generated in the magnetic flux control winding portion can be appropriately changed so that the magnetic flux control effect is further enhanced. For this reason, the magnetic flux irradiated to the magnetosensitive heating element is distributed in an optimal desired state according to the state of the living body .
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of an action part of a conventional magnetic flux irradiation device.
2A is a schematic configuration of an action unit used in the magnetic flux irradiation apparatus according to the first embodiment of the present invention, and FIG. 2B is used in the magnetic flux irradiation apparatus according to each embodiment of the present invention. It is a figure which shows schematic structure of a drive part, (c) is a graph which shows typically the relationship between the winding position of the transverse type solenoid coil shown to (a), and the magnetic flux density which acts on an action end.
3A is a schematic configuration of an action part of a magnetic flux irradiation apparatus according to a second embodiment of the present invention, and FIG. 3B is a schematic configuration of an action part of a magnetic flux irradiation apparatus according to a third embodiment of the present invention. (C) is a figure which shows schematic structure of the two unit action parts which comprise the action part of the magnetic flux irradiation apparatus by the 4th Embodiment of this invention.
[Explanation of symbols]
11, 31, 41 ... action parts 51, 52 ... unit action parts 11 a, 31 a, 41 a ... transverse solenoid coil 11 aa ... basic winding part 11 ab ... reinforcing winding part 11 b ... magnetic cores 11 z, 31 z, 41 z ... action part 11 , 31, 41 working ends 12, 32, 33, 42, 54, 55, 56 ... magnetic flux 13 ... magnetosensitive heating element 14 ... biological body 21 ... drive parts 31b, 41b, 53 ... magnetic flux control winding part

Claims (2)

A solenoid coil and an action part having a magnetic core inserted in the solenoid coil, and a drive part for generating a high-frequency alternating current magnetic flux by causing a high-frequency alternating current to flow through the solenoid coil, and filling and functioning one end of the action part In the magnetic flux irradiation device in which magnetic flux is irradiated from the working end to the magnetosensitive heating element provided inside the living body,
The action portion includes a magnetic flux generation winding portion that generates a magnetic flux to be irradiated to the magnetosensitive heating element, and a magnetic flux control winding portion that is formed to protrude around the action end ,
The magnetic flux generating winding part is composed of a plurality of unit action parts having the same polarity, and the axis of each unit action part is concentrated in a centripetal manner on the magnetosensitive heating element side, and the magnetic flux density is added and strengthened. Coordinated as
The magnetic flux control device according to claim 1, wherein the magnetic flux control winding portion is formed to project around an envelope peripheral edge of the group of working ends belonging to the plurality of unit action portions . 2. The magnetic flux irradiation according to claim 1 , wherein the magnetic flux control winding portion has a structure in which a shape of the magnetic flux generated by the magnetic flux generation winding portion can be set to a desired distribution. apparatus.

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