WO2022050398A1 - Coil and heating device - Google Patents

Coil and heating device Download PDF

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Publication number
WO2022050398A1
WO2022050398A1 PCT/JP2021/032540 JP2021032540W WO2022050398A1 WO 2022050398 A1 WO2022050398 A1 WO 2022050398A1 JP 2021032540 W JP2021032540 W JP 2021032540W WO 2022050398 A1 WO2022050398 A1 WO 2022050398A1
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Prior art keywords
coil
winding
thin film
heating
copper thin
Prior art date
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PCT/JP2021/032540
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French (fr)
Japanese (ja)
Inventor
将人 岡部
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大日本印刷株式会社
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Publication of WO2022050398A1 publication Critical patent/WO2022050398A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/44—Coil arrangements having more than one coil or coil segment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present invention belongs to the technical field of coils and heating devices. More specifically, it belongs to the technical field of a heating device for inducing heating a heated body such as a metal pot to heat, for example, foodstuffs and the like contained in the heated body, and a coil for the heating device.
  • IH Induction Heating
  • IH Induction Heating
  • a cooker such as the IH cooking heater typically has the coil (that is, a cooking heating port) configured by winding a so-called litz wire or the like in which a plurality of coated conductors are twisted in a plane, and simultaneously having a plurality of coils. In many cases, it has a plurality of the above coils so that the ingredients of the above can be cooked.
  • Such IH cooking heaters are roughly classified into so-called built-in type and stationary type from the viewpoint of installation method in the kitchen.
  • the built-in type IH cooking heater is a top plate in which a cooker body (housing) including an IH cooking heater is inserted into a storage portion (mounting hole) provided in a system kitchen, and the top plate protrudes from the upper surface of the cooker body. It is installed by placing the peripheral edge on the edge (worktop) around the storage section.
  • Examples of the prior art document showing the prior art relating to such an IH cooking heater include the following Patent Document 1.
  • the present invention has been made in view of the above requirements, and examples of the problems are further weight reduction and thinning, improvement of transmission efficiency as an IH cooking heater, and prevention of an increase in operating temperature. It is an object of the present invention to provide a coil that can be compatible with each other and a heating device using the coil.
  • the invention according to claim 1 is a coil used for heating an object to be heated by induction heating, which is wound from the outer peripheral side to the inner peripheral side of the coil and is a thin film conductor. It is provided with an outer / inner winding line made of, and an inner / outer winding line which is wound from the inner peripheral side toward the outer peripheral side and is made of a thin film conductor and is laminated on the outer / inner winding line with an insulating layer interposed therebetween.
  • the position seen from the center of the coil of each winding of the outer and inner winding lines and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view.
  • the invention according to claim 5 has the coil according to any one of claims 1 to 4, and the heated body on which the heated body is mounted.
  • a mounting plate arranged between the coils and a power supply means for supplying electric power for heating to the coils are provided.
  • an outer / inner winding line made of a thin film conductor and an inner / outer winding line made of a thin film conductor and laminated on the outer / inner winding line with an insulating layer interposed therebetween are provided.
  • the position seen from the center of each winding of the outer and inner winding lines and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view. Therefore, it is possible to reduce the AC resistance as a coil due to the so-called skin effect or proximity effect caused by forming the winding line of the coil with a thin film conductor for the purpose of weight reduction and thinning, and the weight reduction and thinning can be achieved. It is possible to achieve both improvement of the transmission efficiency of the coil itself and prevention of an increase in the operating temperature.
  • the skin effect is generally that when a high-frequency current is passed through a thin film conductor, the current density is high on the surface of the thin film conductor, becomes lower toward the center from the surface, and the frequency of the current becomes higher. Indeed, the current is concentrated on the surface, and as a result, the AC resistance of the thin film conductor increases. Further, the proximity effect is an electrical phenomenon that reduces the efficiency of the coil as in the skin effect due to the thin film conductors being close to each other in the winding as a coil.
  • the invention according to claim 2 describes the transition portion of each winding of the outer and inner winding lines in the radial direction of the coil and the inner and outer windings of the coil according to claim 1.
  • the transition portion in the winding of the winding line is formed at a position along one radius in the coil.
  • the transition portion in the winding of the outer / inner winding line and the transition part in the winding of the inner / outer winding line are coiled. It is formed at a position along one radius in. Therefore, by increasing the winding part of the inner / outer winding line and the winding part of the outer / inner winding line whose positions seen from the center of the coil match in a plan view, the transmission efficiency is further improved and the operating temperature rises. Can be further prevented.
  • the invention according to claim 3 is the coil according to claim 1 or 2, wherein the coil includes the outer inner winding line and the inner / outer winding line. Is circular.
  • the overall shape of the coil including the outer inner winding line and the inner / outer winding line is circular in a plan view. Therefore, it is possible to efficiently heat the heated object by adapting it to the general plan view shape of the heated object such as a pot.
  • the invention according to claim 4 is the coil according to any one of claims 1 to 3, in which a part of the winding in the outer inner winding line and the inner and outer windings are performed.
  • a part of the winding in the winding line is formed on the peripheral side of the coil when viewed from the center, and the other part of the winding in the outer inner winding line and the other winding in the inner / outer winding line.
  • a part of the coil is formed on the center side of the coil when viewed from the center.
  • a part of the winding in the outer and inner winding lines and the winding in the inner and outer winding lines is formed on the peripheral side of the coil when viewed from the center of the coil, and the other part of the winding in the outer / inner winding line and the other part of the winding in the inner / outer winding line are seen from the center. It is formed on the center side of the coil. Therefore, the wound body can be efficiently heated by the winding lines on the peripheral side and the central side.
  • an outer / inner winding line made of a thin film conductor and an inner / outer winding line made of a thin film conductor and laminated on the outer / inner winding line with an insulating layer interposed therebetween are provided, and each winding of the outer / inner winding line is provided.
  • the position seen from the center of the coil and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view.
  • FIG. 1 It is a top view (iii) which shows the structure of the heating coil of a conventional example. It is a figure which shows the relationship between the frequency and the inductance as an effect by the structure of the heating coil of an embodiment. It is a figure which shows the relationship between a frequency and a Q value as an effect by the structure of the heating coil of an embodiment.
  • FIG. 1 is a perspective view or the like schematically showing the whole of the induction heating type cooker of the embodiment.
  • the cooker 1 of the embodiment includes a so-called built-in type IH cooking heater installed in a storage portion provided on a worktop of the kitchen.
  • the cooker 1 of the embodiment is roughly a heat-resistant top plate (hereinafter, "top") made of heat-resistant glass or the like, which covers almost the entire main body portion 2 mainly made of sheet metal or the like and the upper surface thereof. It is provided with 3) 3, a heating unit 10, a heating unit 20a and a heating unit 20b, and a cooking grill 4.
  • This top plate 3 corresponds to an example of the "mounting plate” of the present invention.
  • the cooker 1 of the embodiment includes an intake window 5 provided on the back side of the top plate 3, a pair of exhaust windows 6a, and an exhaust window 6b.
  • the present invention will be exemplified by using a cooker 1 having a so-called center grill structure in which a cooking grill 4 is arranged substantially in the center of the main body 2, but the present invention includes this.
  • the present invention is not limited, and can be similarly applied to a cooking grill 4 that is biased to either side (a cooker having a so-called side grill structure) or a cooker that does not have the cooking grill 4. Is.
  • the cooker 1 of the embodiment has an operation panel 7 used for the user to operate the heating unit 10, the heating unit 20a and the heating unit 20b, and the cooking grill 4, and the heating power adjustment for adjusting the heating power (output power).
  • a dial 8a and a thermal power adjustment dial 8b are provided.
  • the configuration and arrangement position of the operation panel 7, the thermal power adjustment dial 8a, and the thermal power adjustment dial 8b are not limited to those shown in the drawings.
  • the adjustment dial 8b and the cooking grill 4 may be arranged together on the opposite side.
  • the heating unit 10, the heating unit 20a, and the heating unit 20b which play a central role in the heating function of the cooker 1 of the embodiment, will be specifically described with reference to FIGS. 1 (b) to 4 (FIG. 4).
  • the heating unit 10, the heating unit 20a, and the heating unit 20b of the embodiment basically have the same configuration. Therefore, in the following description, the configuration of the heating unit 10 will be described on behalf of these.
  • the heating unit 10 of the embodiment includes a heating coil C which is an induction heating body arranged in the main body portion 2 below the top plate 3 and the heating. It is configured to include a power supply unit 9 that supplies a high-frequency current to the coil C, and a ferrite F that is arranged in a main body 2 below the heating coil C.
  • a high-frequency current having a size corresponding to the thermal power adjustment operation in the operation panel 7, the thermal power adjustment dial 8a, and the thermal power adjustment dial 8b is generated from the power supply unit 9 by the heating coil. It is supplied to C.
  • the frequency of the high frequency current supplied at this time is, for example, 20 kHz to 100 kHz.
  • the material of the pot or the like placed on the top plate 3 is determined by detecting, for example, the generation state of the induced magnetic field when the pot or the like is placed in the power supply unit 9. To. Then, it is preferable to switch the frequency of the high frequency current based on the determination result.
  • the power supply unit 9 corresponds to an example of the "power supply means" of the present invention.
  • the heating coil C of the embodiment is configured by laminating coils, each of which is formed by winding a copper thin film wire, in multiple layers with an insulating layer interposed therebetween.
  • laminating coils each of which is formed by winding a copper thin film wire, in multiple layers with an insulating layer interposed therebetween.
  • the ferrite F arranged below the heating coil C is formed of, for example, a material having a high magnetic permeability, and is formed on the heating coil C and the heating portions 20a and the heating portions 20b arranged adjacent to each other, respectively. It has a function of increasing the eddy current formed in the pot or the like placed on the top plate 3 by magnetically coupling with a corresponding heating coil (not shown).
  • FIGS. 2 to 4 are plan views showing the structure of the heating coil of the embodiment, and is a case where the heating coil C is viewed from the top plate 3 side in the cooker 1 (see FIG. 1 (b)). It is a plan view.
  • the heating coil C of the embodiment includes a coil C1 configured by winding one, for example, a copper thin film wire L1 and a coil C2 (not shown in FIG. 2). It is configured by being laminated in a direction perpendicular to the paper surface of FIG. 2 via a heat-resistant insulating layer BF. At this time, a well-known heat-resistant insulating material can be used as the material of the insulating layer BF. Further, the winding center of the copper thin film wire L1 constituting the coil C1 and the winding center of the copper thin film wire constituting the coil C2, which will be described later, are the same or substantially the same as each other. In the above configuration, the copper thin film wire L1 corresponds to an example of the "outer inner winding line" of the present invention.
  • the coil C1 of the embodiment is composed of a copper thin film wire L1 wound in the same layer of the heating coil C (the surface of the insulating layer BF exemplified in FIG. 2).
  • An external connection terminal O1 for connecting the copper thin film wire L1 (in other words, the coil C1) to the power supply unit 9 is provided in a part of the outermost peripheral portion (the uppermost portion in the case of the coil C1 shown in FIG. 2). is doing.
  • the coil C1 is configured such that the copper thin film wire L1 is wound around the center of the heating portion 10 in a circular spiral shape eight and a half turns (8.5 turns) counterclockwise from the outermost peripheral portion thereof in FIG.
  • the outer peripheral end portion (the uppermost portion in the case of FIG.
  • the overall shape of the coil C1 is circular.
  • the inner peripheral end portion of the copper thin film wire L1 (the central end portion of the coil C1 in the case of FIG. 2) is formed on the back surface of the insulating layer BF by the via V penetrating the insulating layer BF. It is connected to the copper thin film wire that constitutes.
  • the peripheral coil C1out which is a part of the coil C1 is wound around the peripheral portion in the plan view of the heating portion 10
  • the central coil C1in which is another part of the coil C1 is wound. Is wound around the central portion of the heating portion 10 in a plan view.
  • the copper thin film wire L1 has the same width and the same thickness over the entire circumference of the coil C1. Further, the switching from the outer peripheral side to the inner peripheral side of the winding of the copper thin film wire L1 as the coil C1 (that is, the transition of the winding) is provided at the "12 o'clock" position when the entire coil C1 is regarded as a clock. Each winding is performed once in the winding transition region CR1.
  • FIG. 3 is a plan view showing only the coil C2 taken out.
  • the coil C2 laminated on the coil C1 with the insulating layer BF sandwiched between them is configured by winding one, for example, a copper thin film wire L2.
  • the copper thin film wire L2 corresponds to an example of the "inner / outer winding line" of the present invention.
  • the center of winding of the copper thin film wire L2 constituting the coil C2 and the center of winding of the copper thin film wire L1 constituting the coil C1 are mutually identical or substantially the same.
  • the overall shape of the coil C2 is the same circular shape as the overall shape of the coil C1.
  • the coil C2 of the embodiment is composed of the copper thin film wire L2 wound in the same layer of the heating coil C (the back surface of the insulating layer BF exemplified in FIG. 2).
  • An external connection terminal O2 for connecting the copper thin film wire L2 (in other words, the coil C2) to the power supply unit 9 is provided on a part of the outermost peripheral portion (the uppermost portion in the case of the coil C2 shown in FIG. 3).
  • the copper thin film wire L2 is wound around the center of the heating portion 10 in a circular spiral shape in a counterclockwise direction eight and a half turns (8.5 turns) from the innermost peripheral portion thereof in FIG.
  • the outer peripheral end portion (the uppermost portion in the case of FIG.
  • the overall shape of the coil C2 is also circular.
  • the inner peripheral end portion of the copper thin film wire L2 (in the case shown in FIG. 3, the central end portion of the coil C2) is connected to the copper thin film wire L1 of the coil C1 by the via V.
  • the peripheral coil C2out which is a part of the coil C2 is wound around the peripheral portion in the plan view of the heating portion 10
  • the central coil C2in which is another part of the coil C2, is wound. Is wound around the central portion of the heating portion 10 in a plan view.
  • the copper thin film wire L2 has the same width and the same thickness over the entire circumference of the coil C2. Further, the transition of the winding of the copper thin film wire L2 as the coil C2 from the inner peripheral side to the outer peripheral side is the winding provided at the "12 o'clock" position when the entire coil C2 is regarded as a clock. Each winding is performed once in the transition region CR2.
  • FIG. 4 is a plan view showing the overlapping state of the coil C1 and the coil C2.
  • the coil C1 is a solid line and is laminated immediately below the coil C1 via an insulating layer BF (not shown in FIG. 4).
  • the existing coils C2 are shown by broken lines.
  • a solid line in FIG. 4 it is composed of a copper thin film wire L1 wound from the outer circumference to the inner circumference, and at the innermost peripheral portion thereof, a copper thin film wire L2 and a copper thin film wire L1 constituting the coil C2 are formed.
  • the coil C1 connected by the via V one pitch in the winding of the copper thin film wire L1 (that is, for heating of the adjacent copper thin film wires L1 in each winding only in the winding transition region CR1).
  • the radial distance of the coil C the same shall apply hereinafter), so that the winding position shifts toward the inner circumference side (that is, the winding shifts to the inner circumference side), and the copper thin film wire L1 counterclockwise. It is wound around.
  • FIG. 4 shows.
  • the winding position of the copper thin film wire L2 in the winding is shifted to the outer peripheral side by one pitch (that is, the winding shifts to the outer peripheral side).
  • the copper thin film wire L2 is wound counterclockwise (that is, in the same direction as the copper thin film wire L1 in the coil C1).
  • the uppermost portion of the coil C1 in FIG. 4 was connected to the external connection terminal O1 having a shape protruding outward
  • the uppermost portion of the coil C2 in FIG. 4 was connected to the external connection terminal O2 having a shape protruding outward. It is said to be in shape.
  • the coil C1 and the coil C2 having the above shapes are laminated as shown in FIG. 4, the position of the copper thin film wire L1 and the position of the copper thin film wire L2 as seen from the center of the heating coil C are , Except for the winding transition region CR1 and the winding transition region CR2 in which each winding transitions, they are the same. Therefore, in the heating coil C, the coil C1 and the coil C2 are in an insulating layer in a state where the portion of the coil C1 excluding the winding transition region CR1 and the portion of the coil C2 excluding the winding transition region CR2 overlap. They are laminated with the BF in between.
  • the coil C2 is connected at the innermost peripheral portion of the coil C1 so as to have the same winding direction with respect to the counterclockwise winding from the outermost peripheral portion (external connection terminal O1) to the innermost peripheral portion.
  • the coil C2 is wound from the innermost peripheral portion to the outermost peripheral portion while maintaining the winding direction.
  • FIGS. 5 to 9 are plan views showing the structure of the heating coil of the conventional example
  • FIG. 8 is a diagram showing the relationship between the frequency and the inductance as an effect of the structure of the heating coil C of the embodiment
  • FIG. 9 is a diagram showing the relationship between the frequency and the Q value as the effect.
  • FIGS. 5 to 7 are plan views showing the structure of the heating coil of the conventional example when viewed from the same viewpoint as the heating coil C of the embodiment (see FIG. 1).
  • the same members as those of the heating coil C of the embodiment are designated by the same member numbers, and detailed description thereof will be omitted.
  • the heating coil X of the conventional example includes a coil X1 configured by winding a single copper thin film wire XL1 and a coil X2 (not shown in FIG. 5). It is configured by being laminated in a direction perpendicular to the paper surface of FIG. 5 via an insulating layer BF similar to the heating coil C of the embodiment.
  • the winding center of the copper thin film wire XL1 constituting the coil X1 and the winding center of the copper thin film wire constituting the coil X2, which will be described later, are the same or substantially the same as each other.
  • the coil X1 is composed of a copper thin film wire XL1 wound in the same layer of the heating coil X (the surface of the insulating layer BF exemplified in FIG. 5).
  • An external connection terminal O1 for connecting the copper thin film wire XL1 (in other words, the coil X1) to a conventional power supply unit (not shown) is provided on a part of the outer peripheral portion (the uppermost portion in the case of the coil X1 shown in FIG. 5).
  • the copper thin film wire XL1 makes eight and a half rotations (8.5 turns) in parallel in the counterclockwise direction from the outermost peripheral portion in FIG.
  • the heating portion (not shown) provided with the heating coil X as the center. ) It is configured to be wound in a circular spiral shape, and the outer peripheral end portion (the uppermost portion in the case of FIG. 5) of the copper thin film wire XL1 is connected to the external connection terminal O1. As a result, the overall shape of the coil X1 is circular. Further, the inner peripheral end portion of the copper thin film wire XL1 (the central end portion of the coil X1 in the case of FIG. 5) is formed on the back surface of the insulating layer BF by the via V penetrating the insulating layer BF. It is connected to the copper thin film wire that constitutes.
  • the peripheral coil X1out which is a part of the coil X1
  • the central coil X1in which is another part of the coil X1
  • It is wound around the center of the coil X1 in a plan view.
  • the copper thin film wire XL1 has the same width and the same thickness over the entire circumference of the coil X1 and the same width and the same thickness as the copper thin film wire L1 of the coil C1. Further, the transition of the winding of the copper thin film wire XL1 as the coil X1 from the outer peripheral side to the inner peripheral side is configured to gradually transition to the inner peripheral side over the entire winding of the coil X1. There is.
  • FIG. 6 is a plan view showing only the coil X2 taken out.
  • the coil X2 laminated on the coil X1 with the insulating layer BF sandwiched between them is configured by winding one copper thin film wire XL2.
  • the center of winding of the copper thin film wire XL2 constituting the coil X2 and the center of winding of the copper thin film wire XL1 constituting the coil X1 are the same or substantially the same as described above.
  • the overall shape of the coil X2 is the same circular shape as the overall shape of the coil X1.
  • the coil X2 is composed of the copper thin film wire XL2 wound in the same layer of the heating coil X (the back surface of the insulating layer BF exemplified in FIG. 5).
  • An external connection terminal O2 for connecting the copper thin film wire XL2 (in other words, the coil X2) to the power supply unit (not shown above) is provided in a part of the outermost peripheral portion (the uppermost portion in the case of the coil X2 shown in FIG. 6). is doing.
  • the copper thin film wire XL2 has a circular spiral shape of eight and a half rotations (8.5 turns) in parallel in the counterclockwise direction from the innermost peripheral portion in FIG.
  • the outer peripheral end portion (the uppermost portion in the case of FIG. 6) of the copper thin film wire XL2 is connected to the external connection terminal O2.
  • the overall shape of the coil X2 is circular.
  • the inner peripheral end portion of the copper thin film wire XL2 (in the case shown in FIG. 6, the central end portion of the coil X2) is connected to the copper thin film wire XL1 of the coil X1 by the via V.
  • the peripheral coil X2out which is a part of the coil X2
  • the central coil X2in which is another part of the coil X2 is wound. It is wound around the center of the coil X2 in a plan view.
  • the copper thin film wire XL2 has the same width and the same thickness over the entire circumference of the coil X2 and the same width and the same thickness as the copper thin film wire L2 of the coil C2. Further, the winding transition of the copper thin film wire XL2 as the coil X2 from the inner peripheral side to the outer peripheral side is configured to gradually transition to the outer peripheral side over the entire winding of the coil X2. ..
  • FIG. 7 is a plan view showing the overlapping state of the coil X1 and the coil X2, in which the coil X1 is a solid line and is laminated immediately below the coil X1 via an insulating layer BF (not shown in FIG. 7).
  • the existing coils X2 are shown by broken lines.
  • FIG. 7 it is composed of a copper thin film wire XL1 wound from the outer circumference to the inner circumference, and at the innermost peripheral portion thereof, a copper thin film wire XL2 and a copper thin film wire XL1 constituting the coil X2.
  • the winding gradually shifts to the inner circumference side by one pitch over the entire circumference of the winding (that is, the winding shifts to the inner circumference side).
  • the copper thin film wire XL1 is wound counterclockwise.
  • FIG. 7 As shown by the broken line, the copper thin film wire gradually shifts by one pitch over the entire circumference of the winding so that the winding shifts to the outer peripheral side (that is, the winding shifts to the outer peripheral side).
  • XL2 is wound counterclockwise (that is, in the same direction as the copper thin film wire XL1 in the coil X1). Then, the uppermost portion of the coil X1 in FIG.
  • the coil X1 and the coil X2 having the above shapes are laminated as shown in FIG. 7, the position of the copper thin film wire XL1 and the position of the copper thin film wire XL2 as seen from the center of the heating coil X are , As shown in FIG. That is, unlike the coil C of the embodiment, most of the copper thin film wire XL1 and most of the copper thin film wire XL2 do not overlap when viewed from the center of the heating coil X (see FIGS. 4 and 7). Therefore, as the heating coil X, the coil X1 and the coil X2 are laminated so as to sandwich the insulating layer BF in a state where the coil X1 and the coil X2 do not overlap.
  • the coil X2 is connected at the innermost peripheral portion of the coil X1 so as to have the same winding direction with respect to the counterclockwise winding from the outermost peripheral portion (external connection terminal O1) to the innermost peripheral portion.
  • the coil X2 is wound from the innermost peripheral portion to the outermost peripheral portion while maintaining the winding direction. Due to this structure, as the heating coil X of the conventional example, a current flows counterclockwise from the outermost peripheral portion to the innermost peripheral portion in the coil X1, and the current flows from the innermost peripheral portion to the outermost peripheral portion in the coil X2. It flows in the same counterclockwise direction toward the part.
  • the other specifications of the heating coil C of the embodiment and the heating coil X of the conventional example used in the experiment of the embodiment are as follows.
  • the coil C1 is composed of the winding of the copper thin film wire L1 and the copper thin film wire L2 is wound. Further, the coil C2 laminated on the coil C1 with the insulating layer BF interposed therebetween is provided, and the position seen from the center of the heating coil C of each winding of the copper thin film wire L1 and the center of each winding of the copper thin film wire L2. The position seen from the above is the same in the plan view of the heating coil C except for the winding transition region CR1 and the winding transition region CR2 (see FIG. 4).
  • the winding transition region CR1 and the winding transition region CR2 are formed at positions along one radius in the heating coil C (see FIGS. 2 to 4). Therefore, by increasing the winding portion of the copper thin film wire L1 and the winding portion of the copper thin film wire L2 whose positions seen from the center of the heating coil C match in a plan view, the transmission efficiency is further improved. It is possible to further prevent the operating temperature from rising.
  • the overall shape of the coil C1 including the copper thin film wire L1 and the copper thin film wire L2 in a plan view is circular, it can be efficiently covered by being adapted to the general plan view shape of a heated body such as a pot.
  • the heated body can be heated.
  • peripheral coil C1out and the peripheral coil C2out are wound around the peripheral portion in the plan view of the heating portion 10
  • the central coil C1in and the central coil C2in are wound around the central portion in the plan view of the heating portion 10. Therefore, the heated body can be efficiently heated by the copper thin film wire L1 and the copper thin film wire L2 on the peripheral side and the center side.
  • the present invention can be used in the field of induction heating type cookers, and is particularly applicable to the field of induction heating type cookers for home use, for example, where weight reduction and thinning are required. A remarkable effect can be obtained.
  • Cooker 2 Main body 3 Top plate (top plate) 4 Cooking grill 5 Intake window 6a, 6b Exhaust window 7 Operation panel 8a, 8b Thermal power adjustment dial 9 Power supply unit 10, 20a, 20b Heating unit C, X Heating coil F Ferrite V Via L1, L2, XL1, XL2 Copper Thin film wire C1, C2, X1, X2 coil BF Insulation layer O1, O2 External connection terminal C1out, C2out, X1out, X2out Peripheral coil C1in, C2in, X1in, X2in Central coil CR1, CR2 Winding transition region

Abstract

Provided is a coil that can achieve further lightness of weight and thinness, improve transmission efficiency as an IH cooking heater, and prevent operating temperature rise. The present invention is a heating coil C, used for heating by induction heating, wherein the heating coil comprises: a coil C1 formed by winding a copper thin-film wire L1 from the outer peripheral side toward the inner peripheral side of the heating coil C; and a coil formed by winding a copper thin-film wire from the inner peripheral side toward the outer peripheral side and layered onto the coil C1 so as to sandwich an insulating layer BF. The position of the windings of the copper thin-film wire L1 as viewed from the center of the heating coil C and the position of the windings of the coil layered onto the coil C1 with the insulating layer BF interposed therebetween as viewed from that center match in plan view.

Description

コイル及び加熱装置Coil and heating device
　本発明は、コイル及び加熱装置の技術分野に属する。より詳細には、金属製の鍋等の被加熱体を誘導加熱して当該被加熱体内に収容された例えば食材等を加熱する加熱装置及び当該加熱装置用のコイルの技術分野に属する。 The present invention belongs to the technical field of coils and heating devices. More specifically, it belongs to the technical field of a heating device for inducing heating a heated body such as a metal pot to heat, for example, foodstuffs and the like contained in the heated body, and a coil for the heating device.
　いわゆるＩＨ（Induction Heating）クッキングヒータ等の誘導加熱型の調理器は、平面状に巻回された誘導加熱用のコイルに略２０キロヘルツ乃至１００キロヘルツの高周波電流を供給し、当該コイルに生じる高周波磁界により上記被加熱体に渦電流を形成し、その渦電流によりジュール熱を発生させて当該被加熱体自体を加熱するものである。上記ＩＨクッキングヒータ等の調理器は、典型的には、被覆導線を複数本撚り合わせたいわゆるリッツ線等を平面状に巻回して構成された上記コイル（即ち調理加熱口）を有し、同時に複数の食材を調理できるように複数の上記コイルを有する場合が多い。 Induction heating type cookers such as so-called IH (Induction Heating) cooking heaters supply a high-frequency current of approximately 20 kilohertz to 100 kilohertz to a coil for induction heating wound in a plane, and the high-frequency magnetic field generated in the coil supplies the high-frequency current to the coil. An eddy current is formed in the heated body, and Joule heat is generated by the eddy current to heat the heated body itself. A cooker such as the IH cooking heater typically has the coil (that is, a cooking heating port) configured by winding a so-called litz wire or the like in which a plurality of coated conductors are twisted in a plane, and simultaneously having a plurality of coils. In many cases, it has a plurality of the above coils so that the ingredients of the above can be cooked.
　このようなＩＨクッキングヒータは、キッチンへの設置方法の観点から、いわゆるビルトインタイプと据置タイプに大別される。このうちビルトインタイプのＩＨクッキングヒータは、例えばシステムキッチンに設けられた収納部（取り付け穴）にＩＨクッキングヒータを含む調理器本体（筐体）を挿入し、その調理器本体の上面から張り出したトッププレートの周縁部を収納部周囲の端部（ワークトップ）の上に載せることにより設置される。このようなＩＨクッキングヒータに関する従来技術を示す先行技術文献としては、例えば下記特許文献１が挙げられる。 Such IH cooking heaters are roughly classified into so-called built-in type and stationary type from the viewpoint of installation method in the kitchen. Of these, the built-in type IH cooking heater is a top plate in which a cooker body (housing) including an IH cooking heater is inserted into a storage portion (mounting hole) provided in a system kitchen, and the top plate protrudes from the upper surface of the cooker body. It is installed by placing the peripheral edge on the edge (worktop) around the storage section. Examples of the prior art document showing the prior art relating to such an IH cooking heater include the following Patent Document 1.
　このとき、特許文献１に開示されている従来技術では、本体部と、被加熱体が載置されるトッププレートと、本体部に固定され、トッププレートの周縁部を支持する支持部材と、被加熱体を誘導加熱する複数の加熱部と、各加熱部に高周波電流を供給する複数の給電部と、給電部を制御する制御部とを備え、少なくとも一つの加熱部が、トッププレートと支持部材との間で少なくとも部分的に水平方向に本体部を超えて延び、垂直方向の厚みが表皮深さの４倍以下であるように構成される。 At this time, in the prior art disclosed in Patent Document 1, the main body portion, the top plate on which the heated body is placed, the support member fixed to the main body portion and supporting the peripheral portion of the top plate, and the cover. It is provided with a plurality of heating units that induce and heat the heating body, a plurality of feeding units that supply high-frequency current to each heating unit, and a control unit that controls the feeding unit. At least one heating unit is a top plate and a support member. It is configured so that it extends at least partially horizontally beyond the main body and has a vertical thickness of 4 times or less the skin depth.
特許第６３８３１８０号公報Japanese Patent No. 6383180
　しかしながら、近年におけるＩＨクッキングヒータの普及に伴い、軽量化及び薄型化への要請が高まっている。 However, with the spread of IH cooking heaters in recent years, there is an increasing demand for weight reduction and thinning.
　そこで本発明は、上記の要請に鑑みて為されたもので、その課題の一例は、更なる軽量化及び薄型化と、ＩＨクッキングヒータとしての伝送効率の向上及び動作温度の上昇の防止と、を両立させることが可能なコイル及び当該コイルを用いた加熱装置を提供することにある。 Therefore, the present invention has been made in view of the above requirements, and examples of the problems are further weight reduction and thinning, improvement of transmission efficiency as an IH cooking heater, and prevention of an increase in operating temperature. It is an object of the present invention to provide a coil that can be compatible with each other and a heating device using the coil.
　上記の課題を解決するために、請求項１に記載の発明は、誘導加熱による被加熱体の加熱に用いられるコイルにおいて、当該コイルの外周側から内周側に向けて巻回され且つ薄膜導体からなる外内巻回線と、前記内周側から前記外周側に向けて巻回され且つ薄膜導体からなり、絶縁層を挟んで前記外内巻回線に積層された内外巻回線と、を備え、前記外内巻回線の各巻回の前記コイルの中心から見た位置と、前記内外巻回線の各巻回の当該中心から見た位置と、が、平面視において一致している。 In order to solve the above problems, the invention according to claim 1 is a coil used for heating an object to be heated by induction heating, which is wound from the outer peripheral side to the inner peripheral side of the coil and is a thin film conductor. It is provided with an outer / inner winding line made of, and an inner / outer winding line which is wound from the inner peripheral side toward the outer peripheral side and is made of a thin film conductor and is laminated on the outer / inner winding line with an insulating layer interposed therebetween. The position seen from the center of the coil of each winding of the outer and inner winding lines and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view.
　上記の課題を解決するために、請求項５に記載の発明は、請求項１から請求項４のいずれか一項に記載のコイルと、前記被加熱体が載置され且つ当該被加熱体と前記コイルとの間に配置された載置板と、前記加熱用の電力を前記コイルに供給する電力供給手段と、を備える。 In order to solve the above problems, the invention according to claim 5 has the coil according to any one of claims 1 to 4, and the heated body on which the heated body is mounted. A mounting plate arranged between the coils and a power supply means for supplying electric power for heating to the coils are provided.
　請求項１又は請求項５に記載の発明によれば、薄膜導体からなる外内巻回線と、薄膜導体からなり且つ絶縁層を挟んで外内巻回線に積層された内外巻回線と、を備え、外内巻回線の各巻回のコイルの中心から見た位置と、内外巻回線の各巻回の当該中心から見た位置と、が、平面視において一致している。よって、軽量化及び薄型化を目的としてコイルの巻回線を薄膜導体により形成することに起因する、いわゆる表皮効果又は近接効果によるコイルとしての交流抵抗を低減することができ、当該軽量化及び薄型化と、コイル自体としての伝送効率の向上及び動作温度の上昇の防止と、を両立させることができる。 According to the first or fifth aspect of the present invention, an outer / inner winding line made of a thin film conductor and an inner / outer winding line made of a thin film conductor and laminated on the outer / inner winding line with an insulating layer interposed therebetween are provided. , The position seen from the center of each winding of the outer and inner winding lines and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view. Therefore, it is possible to reduce the AC resistance as a coil due to the so-called skin effect or proximity effect caused by forming the winding line of the coil with a thin film conductor for the purpose of weight reduction and thinning, and the weight reduction and thinning can be achieved. It is possible to achieve both improvement of the transmission efficiency of the coil itself and prevention of an increase in the operating temperature.
　ここで、上記表皮効果とは、一般に、高周波の電流を薄膜導体に流すと、その電流密度が、薄膜導体の表面で高く、表面からその中心に向かうほど低くなり、更に、電流の周波数が高くなるほど電流が表面へ集中することとなり、これらの結果として、その薄膜導体の交流抵抗が高くなる現象を言う。また上記近接効果とは、コイルとしての巻回において薄膜導体同士が近接することに起因して、上記表皮効果と同様にコイルとしての効率を低下させてしまう電気的な現象である。 Here, the skin effect is generally that when a high-frequency current is passed through a thin film conductor, the current density is high on the surface of the thin film conductor, becomes lower toward the center from the surface, and the frequency of the current becomes higher. Indeed, the current is concentrated on the surface, and as a result, the AC resistance of the thin film conductor increases. Further, the proximity effect is an electrical phenomenon that reduces the efficiency of the coil as in the skin effect due to the thin film conductors being close to each other in the winding as a coil.
　上記の課題を解決するために、請求項２に記載の発明は、請求項１に記載のコイルにおいて、前記コイルの半径方向における前記外内巻回線の各前記巻回の遷移部分と、前記内外巻回線の巻回における当該遷移部分と、が、前記コイルにおける一の半径に沿った位置に形成されている。 In order to solve the above-mentioned problems, the invention according to claim 2 describes the transition portion of each winding of the outer and inner winding lines in the radial direction of the coil and the inner and outer windings of the coil according to claim 1. The transition portion in the winding of the winding line is formed at a position along one radius in the coil.
　請求項２に記載の発明によれば、請求項１に記載の発明の作用に加えて、外内巻回線の巻回における遷移部分と、内外巻回線の巻回における遷移部分と、が、コイルにおける一の半径に沿った位置に形成されている。よって、コイルの中心から見た位置が平面視において一致する内外巻回線の巻回の部分と外内巻回線の巻回の部分とを増やすことで、伝送効率をより向上させると共に動作温度の上昇をより防止することができる。 According to the invention of claim 2, in addition to the action of the invention of claim 1, the transition portion in the winding of the outer / inner winding line and the transition part in the winding of the inner / outer winding line are coiled. It is formed at a position along one radius in. Therefore, by increasing the winding part of the inner / outer winding line and the winding part of the outer / inner winding line whose positions seen from the center of the coil match in a plan view, the transmission efficiency is further improved and the operating temperature rises. Can be further prevented.
　上記の課題を解決するために、請求項３に記載の発明は、請求項１又は請求項２に記載のコイルにおいて、前記外内巻回線及び前記内外巻回線を備える当該コイルの平面視全体形状が円形とされている。 In order to solve the above problems, the invention according to claim 3 is the coil according to claim 1 or 2, wherein the coil includes the outer inner winding line and the inner / outer winding line. Is circular.
　請求項３に記載の発明によれば、請求項１又は請求項２に記載の発明の作用に加えて、外内巻回線及び内外巻回線を備えるコイルの平面視全体形状が円形とされているので、鍋等の被加熱体の一般的な平面視形状に適合させて、効率的に被加熱体を加熱することができる。 According to the invention of claim 3, in addition to the action of the invention of claim 1 or 2, the overall shape of the coil including the outer inner winding line and the inner / outer winding line is circular in a plan view. Therefore, it is possible to efficiently heat the heated object by adapting it to the general plan view shape of the heated object such as a pot.
　上記の課題を解決するために、請求項４に記載の発明は、請求項１から請求項３のいずれか一項に記載のコイルにおいて、前記外内巻回線における巻回の一部及び前記内外巻回線における巻回の一部が、前記中心から見て前記コイルの周縁側に形成されており、前記外内巻回線における巻回の他の一部及び前記内外巻回線における巻回の他の一部が、前記中心から見て前記コイルの当該中心側に形成されている。 In order to solve the above problems, the invention according to claim 4 is the coil according to any one of claims 1 to 3, in which a part of the winding in the outer inner winding line and the inner and outer windings are performed. A part of the winding in the winding line is formed on the peripheral side of the coil when viewed from the center, and the other part of the winding in the outer inner winding line and the other winding in the inner / outer winding line. A part of the coil is formed on the center side of the coil when viewed from the center.
　請求項４に記載の発明によれば、請求項１から請求項３のいずれか一項に記載の発明の作用に加えて、外内巻回線における巻回の一部及び内外巻回線における巻回の一部がコイルの中心から見てコイルの周縁側に形成されており、外内巻回線における巻回の他の一部及び内外巻回線における巻回の他の一部が当該中心から見てコイルの中心側に形成されている。よって、周縁側と中心側の巻回線により、被加熱体を効率的に加熱することができる。 According to the invention of claim 4, in addition to the operation of the invention according to any one of claims 1 to 3, a part of the winding in the outer and inner winding lines and the winding in the inner and outer winding lines. A part of the coil is formed on the peripheral side of the coil when viewed from the center of the coil, and the other part of the winding in the outer / inner winding line and the other part of the winding in the inner / outer winding line are seen from the center. It is formed on the center side of the coil. Therefore, the wound body can be efficiently heated by the winding lines on the peripheral side and the central side.
　本発明によれば、薄膜導体からなる外内巻回線と、薄膜導体からなり且つ絶縁層を挟んで外内巻回線に積層された内外巻回線と、を備え、外内巻回線の各巻回のコイルの中心から見た位置と、内外巻回線の各巻回の当該中心から見た位置と、が、平面視において一致している。 According to the present invention, an outer / inner winding line made of a thin film conductor and an inner / outer winding line made of a thin film conductor and laminated on the outer / inner winding line with an insulating layer interposed therebetween are provided, and each winding of the outer / inner winding line is provided. The position seen from the center of the coil and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view.
　従って、軽量化及び薄型化を目的としてコイルの巻回線を薄膜導体により形成することに起因する表皮効果又は近接効果によるコイルとしての交流抵抗を低減することができ、当該軽量化及び薄型化と、コイル自体としての伝送効率の向上及び動作温度の上昇の防止と、を両立させることができる。 Therefore, it is possible to reduce the AC resistance as a coil due to the skin effect or proximity effect caused by forming the winding line of the coil with a thin film conductor for the purpose of weight reduction and thinning. It is possible to improve the transmission efficiency of the coil itself and prevent the operating temperature from rising at the same time.
実施形態の誘導加熱型の調理器の全体を概略的に示す斜視図等であり、（ａ）は当該斜視図であり、（ｂ）は当該調理器を構成する加熱部の構成を示す側視概念図である。It is a perspective view schematically showing the whole of the induction heating type cooker of the embodiment, (a) is the perspective view, and (b) is a side view showing the structure of the heating part constituting the cooker. It is a conceptual diagram. 実施形態の加熱用コイルの構造を示す平面図（ｉ）である。It is a top view (i) which shows the structure of the heating coil of an embodiment. 実施形態の加熱用コイルの構造を示す平面図（ii）である。It is a top view (ii) which shows the structure of the heating coil of an embodiment. 実施形態の加熱用コイルの構造を示す平面図（iii）である。It is a top view (iii) which shows the structure of the heating coil of an embodiment. 従来例の加熱用コイルの構造を示す平面図（ｉ）である。It is a top view (i) which shows the structure of the heating coil of the conventional example. 従来例の加熱用コイルの構造を示す平面図（ii）である。It is a top view (ii) which shows the structure of the heating coil of a conventional example. 従来例の加熱用コイルの構造を示す平面図（iii）である。It is a top view (iii) which shows the structure of the heating coil of a conventional example. 実施形態の加熱用コイルの構造による効果としての周波数とインダクタンスとの関係を示す図である。It is a figure which shows the relationship between the frequency and the inductance as an effect by the structure of the heating coil of an embodiment. 実施形態の加熱用コイルの構造による効果としての周波数とＱ値との関係を示す図である。It is a figure which shows the relationship between a frequency and a Q value as an effect by the structure of the heating coil of an embodiment.
　次に、本発明を実施するための形態について、図面に基づいて説明する。なお、以下に説明する実施形態は、誘導加熱型のＩＨクッキングヒータを含む調理器に対して本発明を適用した場合の実施形態である。なお、以下の説明において、理解を容易にするために方向を表す用語（例えば、「上」、「右」及び「左」等）を適宜用いるが、これは説明のためのものであって、これらの用語は本発明を限定するものでない。 Next, a mode for carrying out the present invention will be described with reference to the drawings. The embodiment described below is an embodiment when the present invention is applied to a cooker including an induction heating type IH cooking heater. In the following description, terms indicating directions (for example, "top", "right", "left", etc.) are appropriately used for ease of understanding, but these are for the purpose of explanation. These terms do not limit the invention.
（Ｉ）実施形態の調理器の全体構成及び動作について
　始めに、実施形態の調理器の全体構成及び動作について、図１を用いて説明する。なお、図１は実施形態の誘導加熱型の調理器の全体を概略的に示す斜視図等である。 (I) Overall configuration and operation of the cooker of the embodiment First, the overall configuration and operation of the cooker of the embodiment will be described with reference to FIG. It should be noted that FIG. 1 is a perspective view or the like schematically showing the whole of the induction heating type cooker of the embodiment.
　図１（ａ）にその全体外観の斜視図を示すように、実施形態の調理器１は、台所のワークトップに設けられた収納部に据え付けられる、いわゆるビルトインタイプのＩＨクッキングヒータを備えている。そして実施形態の調理器１は、概略、主に板金などで構成された本体部２と、その上側表面のほぼ全体を覆う、耐熱ガラス等により形成された耐熱性の天板（以下、「トッププレート」という。）３と、加熱部１０並びに加熱部２０ａ及び加熱部２０ｂと、調理用グリル４と、を備える。このトッププレート３が本発明の「載置板」の一例に相当する。また実施形態の調理器１は、トッププレート３の奥手側に設けられた吸気窓５並びに一対の排気窓６ａ及び排気窓６ｂを備える。 As shown in FIG. 1 (a) as a perspective view of the overall appearance, the cooker 1 of the embodiment includes a so-called built-in type IH cooking heater installed in a storage portion provided on a worktop of the kitchen. The cooker 1 of the embodiment is roughly a heat-resistant top plate (hereinafter, "top") made of heat-resistant glass or the like, which covers almost the entire main body portion 2 mainly made of sheet metal or the like and the upper surface thereof. It is provided with 3) 3, a heating unit 10, a heating unit 20a and a heating unit 20b, and a cooking grill 4. This top plate 3 corresponds to an example of the "mounting plate" of the present invention. Further, the cooker 1 of the embodiment includes an intake window 5 provided on the back side of the top plate 3, a pair of exhaust windows 6a, and an exhaust window 6b.
　なお以下の実施形態では、本体部２のほぼ中央に調理用グリル４が配置された、いわゆるセンターグリル構造を有する調理器１を用いて例示的に本発明を説明するが、本発明はこれに限定されるものではなく、調理用グリル４がいずれか一方の側面に偏ったもの（いわゆるサイドグリル構造を有する調理器）又は調理用グリル４を具備しない調理器にも同様に適用することが可能である。 In the following embodiment, the present invention will be exemplified by using a cooker 1 having a so-called center grill structure in which a cooking grill 4 is arranged substantially in the center of the main body 2, but the present invention includes this. The present invention is not limited, and can be similarly applied to a cooking grill 4 that is biased to either side (a cooker having a so-called side grill structure) or a cooker that does not have the cooking grill 4. Is.
　また、実施形態の調理器１は、ユーザが加熱部１０、加熱部２０ａ及び加熱部２０ｂ並びに調理用グリル４を操作するために用いられる操作パネル７と、火力（出力電力）を調整する火力調節ダイヤル８ａ及び火力調節ダイヤル８ｂと、を備える。なお、操作パネル７並びに火力調節ダイヤル８ａ及び火力調節ダイヤル８ｂの構成及び配置位置等は、図示したものに限定されるものではなく、例えばサイドグリル構造を有する調理器では、火力調節ダイヤル８ａ及び火力調節ダイヤル８ｂと調理用グリル４とは反対側にまとめて配置してもよい。 Further, the cooker 1 of the embodiment has an operation panel 7 used for the user to operate the heating unit 10, the heating unit 20a and the heating unit 20b, and the cooking grill 4, and the heating power adjustment for adjusting the heating power (output power). A dial 8a and a thermal power adjustment dial 8b are provided. The configuration and arrangement position of the operation panel 7, the thermal power adjustment dial 8a, and the thermal power adjustment dial 8b are not limited to those shown in the drawings. The adjustment dial 8b and the cooking grill 4 may be arranged together on the opposite side.
　次に、実施形態の調理器１における加熱機能の中核を担う加熱部１０、加熱部２０ａ及び加熱部２０ｂの構成について、具体的に図１（ｂ）乃至図４を用いて説明する。なお、実施形態の加熱部１０、加熱部２０ａ及び加熱部２０ｂは基本的に同一の構成を備える。よって以下の説明では、これらを代表して加熱部１０の構成について説明する。 Next, the configurations of the heating unit 10, the heating unit 20a, and the heating unit 20b, which play a central role in the heating function of the cooker 1 of the embodiment, will be specifically described with reference to FIGS. 1 (b) to 4 (FIG. 4). The heating unit 10, the heating unit 20a, and the heating unit 20b of the embodiment basically have the same configuration. Therefore, in the following description, the configuration of the heating unit 10 will be described on behalf of these.
　図１（ｂ）にその側視概念図を示すように、実施形態の加熱部１０は、トッププレート３の下方の本体部２内に配置された誘導加熱体たる加熱用コイルＣと、当該加熱用コイルＣに高周波電流を供給する電力供給部９と、加熱用コイルＣ下方の本体部２内に配置されたフェライトＦと、を備えて構成されている。以上の構成において、加熱部１０を用いた加熱時には、操作パネル７並びに火力調節ダイヤル８ａ及び火力調節ダイヤル８ｂにおける火力の調整操作に対応した大きさの高周波電流が、電力供給部９から加熱用コイルＣに供給される。このときに供給される高周波電流の周波数は、例えば２０キロヘルツ乃至１００キロヘルツとされる。この場合に、トッププレート３上に載置されている上記鍋等の材質が、例えば当該鍋等が載置された際の誘導磁界の発生状況等を電力供給部９において検出することにより判定される。そして、当該判定結果に基づいて上記高周波電流の周波数を切り換えるように構成するのが好適である。ここで、上記電力供給部９が本発明の「電力供給手段」の一例に相当する。 As shown in the side view conceptual diagram in FIG. 1 (b), the heating unit 10 of the embodiment includes a heating coil C which is an induction heating body arranged in the main body portion 2 below the top plate 3 and the heating. It is configured to include a power supply unit 9 that supplies a high-frequency current to the coil C, and a ferrite F that is arranged in a main body 2 below the heating coil C. In the above configuration, when heating using the heating unit 10, a high-frequency current having a size corresponding to the thermal power adjustment operation in the operation panel 7, the thermal power adjustment dial 8a, and the thermal power adjustment dial 8b is generated from the power supply unit 9 by the heating coil. It is supplied to C. The frequency of the high frequency current supplied at this time is, for example, 20 kHz to 100 kHz. In this case, the material of the pot or the like placed on the top plate 3 is determined by detecting, for example, the generation state of the induced magnetic field when the pot or the like is placed in the power supply unit 9. To. Then, it is preferable to switch the frequency of the high frequency current based on the determination result. Here, the power supply unit 9 corresponds to an example of the "power supply means" of the present invention.
　一方、詳細を後述するように、実施形態の加熱用コイルＣは、それぞれが銅薄膜線の巻回により構成されているコイルが、絶縁層を挟んで多層に積層されて構成されている。なお以下の説明では、当該コイルが二層積層されて加熱用コイルＣが形成されている場合について説明するが、積層されるコイルの数は、偶数であれば四層以上のコイルが積層されて加熱用コイルＣが形成されてもよい。 On the other hand, as will be described in detail later, the heating coil C of the embodiment is configured by laminating coils, each of which is formed by winding a copper thin film wire, in multiple layers with an insulating layer interposed therebetween. In the following description, a case where the coils are laminated in two layers to form the heating coil C will be described. However, if the number of stacked coils is an even number, four or more layers of coils are laminated. The heating coil C may be formed.
　他方、加熱用コイルＣの下方に配置されたフェライトＦは、例えば透磁率が高い材料により形成されており、加熱用コイルＣと、隣接して配置されている加熱部２０ａ及び加熱部２０ｂにそれぞれ対応した図示しない加熱用コイルと磁気的に結合することにより、トッププレート３上に載置される上記鍋等に形成される渦電流を増大させる機能を有する。 On the other hand, the ferrite F arranged below the heating coil C is formed of, for example, a material having a high magnetic permeability, and is formed on the heating coil C and the heating portions 20a and the heating portions 20b arranged adjacent to each other, respectively. It has a function of increasing the eddy current formed in the pot or the like placed on the top plate 3 by magnetically coupling with a corresponding heating coil (not shown).
（II）加熱用コイルＣの構成について
　次に、実施形態の加熱用コイルＣの構成について、図２乃至図４を用いて説明する。なお、図２乃至図４は実施形態の加熱用コイルの構造を示す平面図であり、調理器１において、トッププレート３側から加熱用コイルＣを見た場合（図１（ｂ）参照）の平面図である。 (II) Configuration of Heating Coil C Next, the configuration of the heating coil C of the embodiment will be described with reference to FIGS. 2 to 4. 2 to 4 are plan views showing the structure of the heating coil of the embodiment, and is a case where the heating coil C is viewed from the top plate 3 side in the cooker 1 (see FIG. 1 (b)). It is a plan view.
　図２にその平面図を示すように、実施形態の加熱用コイルＣは、一本の例えば銅薄膜線Ｌ１の巻回により構成されているコイルＣ１と、図２において図示されないコイルＣ２と、が、耐熱性の絶縁層ＢＦを介して図２の紙面に垂直な方向に積層されて構成される。このとき、絶縁層ＢＦの材料等は周知の耐熱絶縁材料を用いることができる。また、コイルＣ１を構成する銅薄膜線Ｌ１の巻回の中心と、コイルＣ２を構成する後述の銅薄膜線の巻回の中心とは、相互に同一又は略同一とされている。以上の構成において、銅薄膜線Ｌ１が、本発明の「外内巻回線」の一例に相当する。 As shown in the plan view in FIG. 2, the heating coil C of the embodiment includes a coil C1 configured by winding one, for example, a copper thin film wire L1 and a coil C2 (not shown in FIG. 2). It is configured by being laminated in a direction perpendicular to the paper surface of FIG. 2 via a heat-resistant insulating layer BF. At this time, a well-known heat-resistant insulating material can be used as the material of the insulating layer BF. Further, the winding center of the copper thin film wire L1 constituting the coil C1 and the winding center of the copper thin film wire constituting the coil C2, which will be described later, are the same or substantially the same as each other. In the above configuration, the copper thin film wire L1 corresponds to an example of the "outer inner winding line" of the present invention.
　そして図２に示すように、実施形態のコイルＣ１は、加熱用コイルＣの同じ層内（図２に例示する絶縁層ＢＦの表面）を巻回されている銅薄膜線Ｌ１により構成されており、その最外周部の一部（図２に示すコイルＣ１の場合は最上部）に、銅薄膜線Ｌ１（換言すればコイルＣ１）を電力供給部９に接続するための外部接続端子Ｏ１を有している。そしてコイルＣ１は、銅薄膜線Ｌ１が、加熱部１０の中心を中心として、図２におけるその最外周部から反時計方向に八回転半（８．５ターン）円形渦巻き状に巻回されて構成されており、銅薄膜線Ｌ１の外周端部（図２に示す場合は最上部）が上記外部接続端子Ｏ１に接続されている。これにより、コイルＣ１の全体形状としては円形となっている。また、銅薄膜線Ｌ１の内周端部（図２に示す場合はコイルＣ１の中心側端部）は、絶縁層ＢＦを貫通するビアＶにより、絶縁層ＢＦの裏面に形成されているコイルＣ２を構成する銅薄膜線に接続されている。更に、銅薄膜線Ｌ１の巻回は、コイルＣ１の一部である周縁部コイルＣ１outが加熱部１０の平面視における周縁部で巻回され、コイルＣ１の他の一部である中心部コイルＣ１inが加熱部１０の平面視における中心部で巻回されている。 As shown in FIG. 2, the coil C1 of the embodiment is composed of a copper thin film wire L1 wound in the same layer of the heating coil C (the surface of the insulating layer BF exemplified in FIG. 2). , An external connection terminal O1 for connecting the copper thin film wire L1 (in other words, the coil C1) to the power supply unit 9 is provided in a part of the outermost peripheral portion (the uppermost portion in the case of the coil C1 shown in FIG. 2). is doing. The coil C1 is configured such that the copper thin film wire L1 is wound around the center of the heating portion 10 in a circular spiral shape eight and a half turns (8.5 turns) counterclockwise from the outermost peripheral portion thereof in FIG. The outer peripheral end portion (the uppermost portion in the case of FIG. 2) of the copper thin film wire L1 is connected to the external connection terminal O1. As a result, the overall shape of the coil C1 is circular. Further, the inner peripheral end portion of the copper thin film wire L1 (the central end portion of the coil C1 in the case of FIG. 2) is formed on the back surface of the insulating layer BF by the via V penetrating the insulating layer BF. It is connected to the copper thin film wire that constitutes. Further, in the winding of the copper thin film wire L1, the peripheral coil C1out, which is a part of the coil C1, is wound around the peripheral portion in the plan view of the heating portion 10, and the central coil C1in which is another part of the coil C1 is wound. Is wound around the central portion of the heating portion 10 in a plan view.
　以上のコイルＣ１の構成において、銅薄膜線Ｌ１は、コイルＣ１の全周に渡って同一幅及び同一厚さとされている。また、コイルＣ１としての銅薄膜線Ｌ１の巻回の外周側から内周側への切り換え（即ち巻回の遷移）は、コイルＣ１全体を時計に見立てた場合の「１２時」の位置に設けられた巻回遷移領域ＣＲ１内においてそれぞれ一巻回ずつ行われている。 In the above configuration of the coil C1, the copper thin film wire L1 has the same width and the same thickness over the entire circumference of the coil C1. Further, the switching from the outer peripheral side to the inner peripheral side of the winding of the copper thin film wire L1 as the coil C1 (that is, the transition of the winding) is provided at the "12 o'clock" position when the entire coil C1 is regarded as a clock. Each winding is performed once in the winding transition region CR1.
　次に、上記絶縁層ＢＦを介して上記コイルＣ１の直下に積層されているコイルＣ２の構成について、図３を用いて説明する。なお図３は、当該コイルＣ２のみを取り出して示す平面図である。 Next, the configuration of the coil C2 laminated directly under the coil C1 via the insulating layer BF will be described with reference to FIG. Note that FIG. 3 is a plan view showing only the coil C2 taken out.
　図３にその平面図を示すように、絶縁層ＢＦを間に挟んで上記コイルＣ１に積層されるコイルＣ２は、一本の例えば銅薄膜線Ｌ２の巻回により構成されている。この構成において、銅薄膜線Ｌ２が本発明の「内外巻回線」の一例に相当する。このとき上述したように、コイルＣ２を構成する銅薄膜線Ｌ２の巻回の中心と、上記コイルＣ１を構成する銅薄膜線Ｌ１の巻回の中心とは、相互に同一又は略同一とされている。更に、コイルＣ２の全体形状は、コイルＣ１の全体形状と同一の円形とされている。 As shown in the plan view in FIG. 3, the coil C2 laminated on the coil C1 with the insulating layer BF sandwiched between them is configured by winding one, for example, a copper thin film wire L2. In this configuration, the copper thin film wire L2 corresponds to an example of the "inner / outer winding line" of the present invention. At this time, as described above, the center of winding of the copper thin film wire L2 constituting the coil C2 and the center of winding of the copper thin film wire L1 constituting the coil C1 are mutually identical or substantially the same. There is. Further, the overall shape of the coil C2 is the same circular shape as the overall shape of the coil C1.
　そして図３に示すように、実施形態のコイルＣ２は、加熱用コイルＣの同じ層内（図２に例示する絶縁層ＢＦの裏面）を巻回されている上記銅薄膜線Ｌ２により構成されており、その最外周部の一部（図３に示すコイルＣ２の場合は最上部）に、銅薄膜線Ｌ２（換言すればコイルＣ２）を電力供給部９に接続するための外部接続端子Ｏ２を有している。そしてコイルＣ２は、銅薄膜線Ｌ２が、加熱部１０の中心を中心として、図３におけるその最内周部から反時計方向に八回転半（８．５ターン）円形渦巻き状に巻回されて構成されており、銅薄膜線Ｌ２の外周端部（図３に示す場合は最上部）が上記外部接続端子Ｏ２に接続されている。これにより、コイルＣ２の全体形状も円形となっている。また、銅薄膜線Ｌ２の内周端部（図３に示す場合はコイルＣ２の中心側端部）は、上記ビアＶによりコイルＣ１の銅薄膜線Ｌ１に接続されている。更に、銅薄膜線Ｌ２の巻回は、コイルＣ２の一部である周縁部コイルＣ２outが加熱部１０の平面視における周縁部で巻回され、コイルＣ２の他の一部である中心部コイルＣ２inが加熱部１０の平面視における中心部で巻回されている。 As shown in FIG. 3, the coil C2 of the embodiment is composed of the copper thin film wire L2 wound in the same layer of the heating coil C (the back surface of the insulating layer BF exemplified in FIG. 2). An external connection terminal O2 for connecting the copper thin film wire L2 (in other words, the coil C2) to the power supply unit 9 is provided on a part of the outermost peripheral portion (the uppermost portion in the case of the coil C2 shown in FIG. 3). Have. Then, in the coil C2, the copper thin film wire L2 is wound around the center of the heating portion 10 in a circular spiral shape in a counterclockwise direction eight and a half turns (8.5 turns) from the innermost peripheral portion thereof in FIG. The outer peripheral end portion (the uppermost portion in the case of FIG. 3) of the copper thin film wire L2 is connected to the external connection terminal O2. As a result, the overall shape of the coil C2 is also circular. Further, the inner peripheral end portion of the copper thin film wire L2 (in the case shown in FIG. 3, the central end portion of the coil C2) is connected to the copper thin film wire L1 of the coil C1 by the via V. Further, in the winding of the copper thin film wire L2, the peripheral coil C2out, which is a part of the coil C2, is wound around the peripheral portion in the plan view of the heating portion 10, and the central coil C2in, which is another part of the coil C2, is wound. Is wound around the central portion of the heating portion 10 in a plan view.
　以上のコイルＣ２の構成において、銅薄膜線Ｌ２は、コイルＣ２の全周に渡って同一幅及び同一厚さとされている。また、コイルＣ２としての銅薄膜線Ｌ２の巻回の内周側から外周側への巻回の遷移は、コイルＣ２全体を時計に見立てた場合の「１２時」の位置に設けられた巻回遷移領域ＣＲ２内においてそれぞれ一巻回ずつ行われている。 In the above configuration of the coil C2, the copper thin film wire L2 has the same width and the same thickness over the entire circumference of the coil C2. Further, the transition of the winding of the copper thin film wire L2 as the coil C2 from the inner peripheral side to the outer peripheral side is the winding provided at the "12 o'clock" position when the entire coil C2 is regarded as a clock. Each winding is performed once in the transition region CR2.
　次に、上記銅薄膜線Ｌ１からなる上記コイルＣ１と、上記銅薄膜線Ｌ２からなる上記コイルＣ２と、の位置関係について、図４を用いて説明する。なお図４は、コイルＣ１とコイルＣ２との重なり状況を示す平面図であり、コイルＣ１を実線で、その直下に絶縁層ＢＦ（図４において図示を省略している）を介して積層されているコイルＣ２を破線で、それぞれ示している。 Next, the positional relationship between the coil C1 made of the copper thin film wire L1 and the coil C2 made of the copper thin film wire L2 will be described with reference to FIG. Note that FIG. 4 is a plan view showing the overlapping state of the coil C1 and the coil C2. The coil C1 is a solid line and is laminated immediately below the coil C1 via an insulating layer BF (not shown in FIG. 4). The existing coils C2 are shown by broken lines.
　図４に実線で示すように、外周から内周に向けて巻回された銅薄膜線Ｌ１からなり、且つその最内周部で、コイルＣ２を構成する銅薄膜線Ｌ２と銅薄膜線Ｌ１とがビアＶにより接続されるコイルＣ１では、上記巻回遷移領域ＣＲ１のみにおいて、銅薄膜線Ｌ１の巻回における一のピッチ（即ち、各巻回において隣り合う銅薄膜線Ｌ１の、各巻回における加熱用コイルＣの径方向の距離。以下、同様。）ずつその巻回の位置が内周側にずれるように（即ち巻回が内周側に遷移するように）、銅薄膜線Ｌ１が反時計回りに巻回されている。 As shown by a solid line in FIG. 4, it is composed of a copper thin film wire L1 wound from the outer circumference to the inner circumference, and at the innermost peripheral portion thereof, a copper thin film wire L2 and a copper thin film wire L1 constituting the coil C2 are formed. In the coil C1 connected by the via V, one pitch in the winding of the copper thin film wire L1 (that is, for heating of the adjacent copper thin film wires L1 in each winding only in the winding transition region CR1). The radial distance of the coil C; the same shall apply hereinafter), so that the winding position shifts toward the inner circumference side (that is, the winding shifts to the inner circumference side), and the copper thin film wire L1 counterclockwise. It is wound around.
　これに対し、コイルＣ１を構成する銅薄膜線Ｌ１とビアＶによりその最内周部で接続される銅薄膜線Ｌ２が内周から外周に向けて巻回されてなるコイルＣ２では、図４に破線で示すように、上記巻回遷移領域ＣＲ２のみにおいて、銅薄膜線Ｌ２の巻回における一ピッチずつその巻回の位置が外周側にずれるように（即ち巻回が外周側に遷移するように）、銅薄膜線Ｌ２が反時計回り（即ちコイルＣ１における銅薄膜線Ｌ１と同方向）に巻回されている。そして、コイルＣ１の図４中最上部が、外側に突出した形状の外部接続端子Ｏ１に接続され、コイルＣ２の図４中最上部が、外側に突出した形状の外部接続端子Ｏ２に接続された形状とされている。 On the other hand, in the coil C2 in which the copper thin film wire L1 constituting the coil C1 and the copper thin film wire L2 connected at the innermost peripheral portion thereof by the via V are wound from the inner circumference toward the outer circumference, FIG. 4 shows. As shown by the broken line, only in the winding transition region CR2, the winding position of the copper thin film wire L2 in the winding is shifted to the outer peripheral side by one pitch (that is, the winding shifts to the outer peripheral side). ), The copper thin film wire L2 is wound counterclockwise (that is, in the same direction as the copper thin film wire L1 in the coil C1). Then, the uppermost portion of the coil C1 in FIG. 4 was connected to the external connection terminal O1 having a shape protruding outward, and the uppermost portion of the coil C2 in FIG. 4 was connected to the external connection terminal O2 having a shape protruding outward. It is said to be in shape.
　以上のような形状をそれぞれ備えるコイルＣ１とコイルＣ２が図４に示すように積層されていることで、加熱用コイルＣの中心から見た銅薄膜線Ｌ１の位置と銅薄膜線Ｌ２の位置は、それぞれの巻回が遷移する巻回遷移領域ＣＲ１及び巻回遷移領域ＣＲ２を除いて同一となっている。よって、加熱用コイルＣとしては、コイルＣ１の巻回遷移領域ＣＲ１を除く部分と、コイルＣ２の巻回遷移領域ＣＲ２を除く部分と、が重なった状態で、コイルＣ１とコイルＣ２とが絶縁層ＢＦを挟んで積層されている。これにより、コイルＣ１の最外周部（外部接続端子Ｏ１）から最内周部への反時計方向の巻回に対して、同じ巻回方向となるように当該最内周部でコイルＣ２が接続され、その巻回方向を維持したまま、コイルＣ２が最内周部から最外周部へ巻回されている。この構造により、実施形態の加熱用コイルＣとしては、コイルＣ１において最外周部から最内周部に向けて反時計方向に電流が流れ、その電流が、コイルＣ２において最内周部から最外周部に向けて同じ反時計方向に流れる。 Since the coil C1 and the coil C2 having the above shapes are laminated as shown in FIG. 4, the position of the copper thin film wire L1 and the position of the copper thin film wire L2 as seen from the center of the heating coil C are , Except for the winding transition region CR1 and the winding transition region CR2 in which each winding transitions, they are the same. Therefore, in the heating coil C, the coil C1 and the coil C2 are in an insulating layer in a state where the portion of the coil C1 excluding the winding transition region CR1 and the portion of the coil C2 excluding the winding transition region CR2 overlap. They are laminated with the BF in between. As a result, the coil C2 is connected at the innermost peripheral portion of the coil C1 so as to have the same winding direction with respect to the counterclockwise winding from the outermost peripheral portion (external connection terminal O1) to the innermost peripheral portion. The coil C2 is wound from the innermost peripheral portion to the outermost peripheral portion while maintaining the winding direction. With this structure, as the heating coil C of the embodiment, a current flows counterclockwise from the outermost peripheral portion to the innermost peripheral portion in the coil C1, and the current flows from the innermost peripheral portion to the outermost peripheral portion in the coil C2. It flows in the same counterclockwise direction toward the part.
　次に、図２乃至図４に示す構成を有する実施形態の加熱用コイルＣに対して電力供給部９から供給される高周波電力の周波数を変更して加熱用コイルＣのインダクタンス及びＱ値を計測した結果（シミュレーション結果）について、従来例の加熱用コイルとの比較において、実施例として図５乃至図９を用いて説明する。なお、図５乃至図７は従来例の加熱用コイルの構造を示す平面図であり、図８は実施形態の加熱用コイルＣの構造による効果としての周波数とインダクタンスとの関係を示す図であり、図９は当該効果としての周波数とＱ値との関係を示す図である。 Next, the frequency of the high-frequency power supplied from the power supply unit 9 is changed with respect to the heating coil C of the embodiment having the configurations shown in FIGS. 2 to 4, and the inductance and the Q value of the heating coil C are measured. The results (simulation results) will be described with reference to FIGS. 5 to 9 as examples in comparison with the heating coil of the conventional example. 5 to 7 are plan views showing the structure of the heating coil of the conventional example, and FIG. 8 is a diagram showing the relationship between the frequency and the inductance as an effect of the structure of the heating coil C of the embodiment. , FIG. 9 is a diagram showing the relationship between the frequency and the Q value as the effect.
　ここで、上記実施例を説明する前に、その比較対象たる従来例の加熱用コイルの構成について、図５乃至図７を用いて、その概要を説明する。なお、図５乃至図７は、実施形態の加熱用コイルＣと同じ視点から見た場合（図１参照）の、従来例の加熱用コイルの構造を示す平面図である。このとき、図５乃至図７において、実施形態の加熱用コイルＣと同一の部材については、同一の部材番号を付して、細部の説明を省略する。 Here, before explaining the above embodiment, the outline of the configuration of the heating coil of the conventional example to be compared will be described with reference to FIGS. 5 to 7. 5 to 7 are plan views showing the structure of the heating coil of the conventional example when viewed from the same viewpoint as the heating coil C of the embodiment (see FIG. 1). At this time, in FIGS. 5 to 7, the same members as those of the heating coil C of the embodiment are designated by the same member numbers, and detailed description thereof will be omitted.
　図５にその平面図を示すように、従来例の加熱用コイルＸは、一本の銅薄膜線ＸＬ１の巻回により構成されているコイルＸ１と、図５において図示されないコイルＸ２と、が、実施形態の加熱用コイルＣと同様の絶縁層ＢＦを介して図５の紙面に垂直な方向に積層されて構成されている。このとき、コイルＸ１を構成する銅薄膜線ＸＬ１の巻回の中心と、コイルＸ２を構成する後述の銅薄膜線の巻回の中心とは、相互に同一又は略同一とされている。 As shown in the plan view in FIG. 5, the heating coil X of the conventional example includes a coil X1 configured by winding a single copper thin film wire XL1 and a coil X2 (not shown in FIG. 5). It is configured by being laminated in a direction perpendicular to the paper surface of FIG. 5 via an insulating layer BF similar to the heating coil C of the embodiment. At this time, the winding center of the copper thin film wire XL1 constituting the coil X1 and the winding center of the copper thin film wire constituting the coil X2, which will be described later, are the same or substantially the same as each other.
　そして図５に示すように、コイルＸ１は、加熱用コイルＸの同じ層内（図５に例示する絶縁層ＢＦの表面）を巻回されている銅薄膜線ＸＬ１により構成されており、その最外周部の一部（図５に示すコイルＸ１の場合は最上部）に、銅薄膜線ＸＬ１（換言すればコイルＸ１）を図示しない従来例の電力供給部に接続するための外部接続端子Ｏ１を有している。そしてコイルＸ１は、銅薄膜線ＸＬ１が、加熱用コイルＸを備える図示しない加熱部の中心を中心として、図５におけるその最外周部から反時計方向に並行して八回転半（８．５ターン）円形渦巻き状に巻回されて構成されており、銅薄膜線ＸＬ１の外周端部（図５に示す場合は最上部）が上記外部接続端子Ｏ１に接続されている。これにより、コイルＸ１の全体形状としては円形となっている。また、銅薄膜線ＸＬ１の内周端部（図５に示す場合はコイルＸ１の中心側端部）は、絶縁層ＢＦを貫通するビアＶにより、絶縁層ＢＦの裏面に形成されているコイルＸ２を構成する銅薄膜線に接続されている。更に、銅薄膜線ＸＬ１の巻回は、コイルＸ１の一部である周縁部コイルＸ１outがコイルＸ１の平面視における周縁部で巻回され、コイルＸ１の他の一部である中心部コイルＸ１inがコイルＸ１の平面視における中心部で巻回されている。 As shown in FIG. 5, the coil X1 is composed of a copper thin film wire XL1 wound in the same layer of the heating coil X (the surface of the insulating layer BF exemplified in FIG. 5). An external connection terminal O1 for connecting the copper thin film wire XL1 (in other words, the coil X1) to a conventional power supply unit (not shown) is provided on a part of the outer peripheral portion (the uppermost portion in the case of the coil X1 shown in FIG. 5). Have. Then, in the coil X1, the copper thin film wire XL1 makes eight and a half rotations (8.5 turns) in parallel in the counterclockwise direction from the outermost peripheral portion in FIG. 5 with the center of the heating portion (not shown) provided with the heating coil X as the center. ) It is configured to be wound in a circular spiral shape, and the outer peripheral end portion (the uppermost portion in the case of FIG. 5) of the copper thin film wire XL1 is connected to the external connection terminal O1. As a result, the overall shape of the coil X1 is circular. Further, the inner peripheral end portion of the copper thin film wire XL1 (the central end portion of the coil X1 in the case of FIG. 5) is formed on the back surface of the insulating layer BF by the via V penetrating the insulating layer BF. It is connected to the copper thin film wire that constitutes. Further, in the winding of the copper thin film wire XL1, the peripheral coil X1out, which is a part of the coil X1, is wound around the peripheral portion in the plan view of the coil X1, and the central coil X1in, which is another part of the coil X1, is wound. It is wound around the center of the coil X1 in a plan view.
　以上のコイルＸ１の構成において、銅薄膜線ＸＬ１は、コイルＸ１の全周に渡って同一幅及び同一厚さ且つコイルＣ１の銅薄膜線Ｌ１と同一幅及び同一厚さとされている。また、コイルＸ１としての銅薄膜線ＸＬ１の巻回の外周側から内周側への巻回の遷移は、コイルＸ１の一巻回全体に渡って徐々に内周側へ遷移する構成とされている。 In the above configuration of the coil X1, the copper thin film wire XL1 has the same width and the same thickness over the entire circumference of the coil X1 and the same width and the same thickness as the copper thin film wire L1 of the coil C1. Further, the transition of the winding of the copper thin film wire XL1 as the coil X1 from the outer peripheral side to the inner peripheral side is configured to gradually transition to the inner peripheral side over the entire winding of the coil X1. There is.
　次に、上記絶縁層ＢＦを介してコイルＸ１の直下に積層されているコイルＸ２の構成について、図６を用いて説明する。なお図６は、当該コイルＸ２のみを取り出して示す平面図である。 Next, the configuration of the coil X2 laminated directly under the coil X1 via the insulating layer BF will be described with reference to FIG. Note that FIG. 6 is a plan view showing only the coil X2 taken out.
　図６にその平面図を示すように、絶縁層ＢＦを間に挟んで上記コイルＸ１に積層されるコイルＸ２は、一本の銅薄膜線ＸＬ２の巻回により構成されている。このとき、コイルＸ２を構成する銅薄膜線ＸＬ２の巻回の中心と、上記コイルＸ１を構成する銅薄膜線ＸＬ１の巻回の中心とは、上述したように相互に同一又は略同一とされている。更に、コイルＸ２の全体形状は、コイルＸ１の全体形状と同一の円形とされている。 As shown in the plan view in FIG. 6, the coil X2 laminated on the coil X1 with the insulating layer BF sandwiched between them is configured by winding one copper thin film wire XL2. At this time, the center of winding of the copper thin film wire XL2 constituting the coil X2 and the center of winding of the copper thin film wire XL1 constituting the coil X1 are the same or substantially the same as described above. There is. Further, the overall shape of the coil X2 is the same circular shape as the overall shape of the coil X1.
　そして図６に示すように、コイルＸ２は、加熱用コイルＸの同じ層内（図５に例示する絶縁層ＢＦの裏面）を巻回されている上記銅薄膜線ＸＬ２により構成されており、その最外周部の一部（図６に示すコイルＸ２の場合は最上部）に、銅薄膜線ＸＬ２（換言すればコイルＸ２）を上記図示しない電力供給部に接続するための外部接続端子Ｏ２を有している。そしてコイルＸ２は、銅薄膜線ＸＬ２が、上記図示しない加熱部の中心を中心として、図６におけるその最内周部から反時計方向に並行して八回転半（８．５ターン）円形渦巻き状に巻回されて構成されており、銅薄膜線ＸＬ２の外周端部（図６に示す場合は最上部）が上記外部接続端子Ｏ２に接続されている。これにより、コイルＸ２の全体形状としては円形となっている。また、銅薄膜線ＸＬ２の内周端部（図６に示す場合はコイルＸ２の中心側端部）は、上記ビアＶによりコイルＸ１の銅薄膜線ＸＬ１に接続されている。更に、銅薄膜線ＸＬ２の巻回は、コイルＸ２の一部である周縁部コイルＸ２outがコイルＸ２の平面視における周縁部で巻回され、コイルＸ２の他の一部である中心部コイルＸ２inがコイルＸ２の平面視における中心部で巻回されている。 As shown in FIG. 6, the coil X2 is composed of the copper thin film wire XL2 wound in the same layer of the heating coil X (the back surface of the insulating layer BF exemplified in FIG. 5). An external connection terminal O2 for connecting the copper thin film wire XL2 (in other words, the coil X2) to the power supply unit (not shown above) is provided in a part of the outermost peripheral portion (the uppermost portion in the case of the coil X2 shown in FIG. 6). is doing. Then, in the coil X2, the copper thin film wire XL2 has a circular spiral shape of eight and a half rotations (8.5 turns) in parallel in the counterclockwise direction from the innermost peripheral portion in FIG. 6 with the center of the heating portion (not shown) as the center. The outer peripheral end portion (the uppermost portion in the case of FIG. 6) of the copper thin film wire XL2 is connected to the external connection terminal O2. As a result, the overall shape of the coil X2 is circular. Further, the inner peripheral end portion of the copper thin film wire XL2 (in the case shown in FIG. 6, the central end portion of the coil X2) is connected to the copper thin film wire XL1 of the coil X1 by the via V. Further, in the winding of the copper thin film wire XL2, the peripheral coil X2out, which is a part of the coil X2, is wound around the peripheral portion in the plan view of the coil X2, and the central coil X2in, which is another part of the coil X2, is wound. It is wound around the center of the coil X2 in a plan view.
　以上のコイルＸ２の構成において、銅薄膜線ＸＬ２は、コイルＸ２の全周に渡って同一幅及び同一厚さ且つコイルＣ２の銅薄膜線Ｌ２と同一幅及び同一厚さとされている。また、コイルＸ２としての銅薄膜線ＸＬ２の巻回の内周側から外周側への巻回の遷移は、コイルＸ２の一巻回全体に渡って徐々に外周側へ遷移する構成とされている。 In the above configuration of the coil X2, the copper thin film wire XL2 has the same width and the same thickness over the entire circumference of the coil X2 and the same width and the same thickness as the copper thin film wire L2 of the coil C2. Further, the winding transition of the copper thin film wire XL2 as the coil X2 from the inner peripheral side to the outer peripheral side is configured to gradually transition to the outer peripheral side over the entire winding of the coil X2. ..
　次に、上記銅薄膜線ＸＬ１からなる上記コイルＸ１と、上記銅薄膜線ＸＬ２からなる上記コイルＸ２と、の位置関係について、図７を用いて説明する。なお図７は、コイルＸ１とコイルＸ２との重なり状況を示す平面図であり、コイルＸ１を実線で、その直下に絶縁層ＢＦ（図７において図示を省略している）を介して積層されているコイルＸ２を破線で、それぞれ示している。 Next, the positional relationship between the coil X1 made of the copper thin film wire XL1 and the coil X2 made of the copper thin film wire XL2 will be described with reference to FIG. 7. Note that FIG. 7 is a plan view showing the overlapping state of the coil X1 and the coil X2, in which the coil X1 is a solid line and is laminated immediately below the coil X1 via an insulating layer BF (not shown in FIG. 7). The existing coils X2 are shown by broken lines.
　図７に実線で示すように、外周から内周に向けて巻回された銅薄膜線ＸＬ１からなり、且つその最内周部で、コイルＸ２を構成する銅薄膜線ＸＬ２と銅薄膜線ＸＬ１とがビアＶにより接続されるコイルＸ１では、その巻回における一周全体に渡って徐々に、一ピッチ分ずつその巻回が内周側にずれるように（即ち巻回が内周側に遷移するように）、銅薄膜線ＸＬ１が反時計回りに巻回されている。 As shown by a solid line in FIG. 7, it is composed of a copper thin film wire XL1 wound from the outer circumference to the inner circumference, and at the innermost peripheral portion thereof, a copper thin film wire XL2 and a copper thin film wire XL1 constituting the coil X2. In the coil X1 connected by the via V, the winding gradually shifts to the inner circumference side by one pitch over the entire circumference of the winding (that is, the winding shifts to the inner circumference side). The copper thin film wire XL1 is wound counterclockwise.
　これに対し、コイルＸ１を構成する銅薄膜線ＸＬ１とビアＶによりその最内周部でそれぞれ接続される銅薄膜線ＸＬ２が内周から外周に向けて巻回されてなるコイルＸ２では、図７に破線で示すように、その巻回における一周全体に渡って徐々に、一ピッチ分ずつその巻回が外周側にずれるように（即ち巻回が外周側に遷移するように）、銅薄膜線ＸＬ２が反時計回り（即ちコイルＸ１における銅薄膜線ＸＬ１と同方向）に巻回されている。そして、コイルＸ１の図７中最上部が、外側に突出した形状の外部接続端子Ｏ１に接続され、コイルＸ２の図７中最上部が、外側に突出した形状の外部接続端子Ｏ２に接続された形状とされている。 On the other hand, in the coil X2 in which the copper thin film wire XL1 constituting the coil X1 and the copper thin film wire XL2 connected at the innermost peripheral portion thereof by the via V are wound from the inner circumference toward the outer circumference, FIG. 7 As shown by the broken line, the copper thin film wire gradually shifts by one pitch over the entire circumference of the winding so that the winding shifts to the outer peripheral side (that is, the winding shifts to the outer peripheral side). XL2 is wound counterclockwise (that is, in the same direction as the copper thin film wire XL1 in the coil X1). Then, the uppermost portion of the coil X1 in FIG. 7 was connected to the external connection terminal O1 having a shape protruding outward, and the uppermost portion of the coil X2 in FIG. 7 was connected to the external connection terminal O2 having a shape protruding outward. It is said to be in shape.
　以上のような形状をそれぞれ備えるコイルＸ１とコイルＸ２が図７に示すように積層されていることで、加熱用コイルＸの中心から見た銅薄膜線ＸＬ１の位置と銅薄膜線ＸＬ２の位置は、図７に示すように異なっている。即ち、実施形態のコイルＣのように、銅薄膜線ＸＬ１の大部分と銅薄膜線ＸＬ２の大部分とが加熱用コイルＸの中心から見て重なることはない（図４及び図７参照）。よって、加熱用コイルＸとしては、コイルＸ１とコイルＸ２とが重ならない状態で、コイルＸ１とコイルＸ２とが絶縁層ＢＦを挟んで積層されている。これにより、コイルＸ１の最外周部（外部接続端子Ｏ１）から最内周部への反時計方向の巻回に対して、同じ巻回方向となるように当該最内周部でコイルＸ２が接続され、その巻回方向を維持したまま、コイルＸ２が最内周部から最外周部へ巻回されている。この構造により、従来例の加熱用コイルＸとしては、コイルＸ１において最外周部から最内周部に向けて反時計方向に電流が流れ、その電流が、コイルＸ２において最内周部から最外周部に向けて同じ反時計方向に流れる。 Since the coil X1 and the coil X2 having the above shapes are laminated as shown in FIG. 7, the position of the copper thin film wire XL1 and the position of the copper thin film wire XL2 as seen from the center of the heating coil X are , As shown in FIG. That is, unlike the coil C of the embodiment, most of the copper thin film wire XL1 and most of the copper thin film wire XL2 do not overlap when viewed from the center of the heating coil X (see FIGS. 4 and 7). Therefore, as the heating coil X, the coil X1 and the coil X2 are laminated so as to sandwich the insulating layer BF in a state where the coil X1 and the coil X2 do not overlap. As a result, the coil X2 is connected at the innermost peripheral portion of the coil X1 so as to have the same winding direction with respect to the counterclockwise winding from the outermost peripheral portion (external connection terminal O1) to the innermost peripheral portion. The coil X2 is wound from the innermost peripheral portion to the outermost peripheral portion while maintaining the winding direction. Due to this structure, as the heating coil X of the conventional example, a current flows counterclockwise from the outermost peripheral portion to the innermost peripheral portion in the coil X1, and the current flows from the innermost peripheral portion to the outermost peripheral portion in the coil X2. It flows in the same counterclockwise direction toward the part.
　そして、実施例の実験に供される実施形態の加熱用コイルＣ及び従来例の加熱用コイルＸそれぞれのその他の諸元は、以下の通りである。 The other specifications of the heating coil C of the embodiment and the heating coil X of the conventional example used in the experiment of the embodiment are as follows.
・加熱用コイルＣ及び加熱用コイルＸの大きさ：外径（直径）１７０ミリメートルの円形
・加熱用コイルＣの銅薄膜線Ｌ１及び銅薄膜線Ｌ２並びに加熱用コイルＸの銅薄膜線ＸＬ１及び銅薄膜線ＸＬ２の幅：３．０ミリメートル
・加熱用コイルＣ及び加熱用コイルＸそれぞれにおけるピッチ：６．０ミリメートル
・銅薄膜線Ｌ１及び銅薄膜線Ｌ２並びに銅薄膜線ＸＬ１及び銅薄膜線ＸＬ２それぞれの厚さ：０．４ミリメートル -Size of heating coil C and heating coil X: Circular with an outer diameter (diameter) of 170 mm-Copper thin film wire L1 and copper thin film wire L2 of heating coil C and copper thin film wire XL1 and copper of heating coil X Width of thin film wire XL2: 3.0 mm ・ Pitch in each of heating coil C and heating coil X: 6.0 mm ・ Copper thin film wire L1 and copper thin film wire L2 and copper thin film wire XL1 and copper thin film wire XL2 respectively Thickness: 0.4 mm
　そして図８に示すように、実施形態の電力供給部９及び従来例における上記図示しない電力供給部からそれぞれ供給される高周波電力の周波数の帯域（１０キロヘルツ乃至１００キロヘルツ）では、実施形態の加熱用コイルＣを用いた方が、従来例の加熱用コイルＸを用いる場合よりもインダクタンスが高いことが判る。また、図９に示すように、上記周波数の帯域では、実施形態の加熱用コイルＣを用いた方が、従来例の加熱用コイルＸを用いる場合よりもＱ値が高い（即ち損失が少ない）ことが判る。以上のように、本発明の発明者による実験により、実施形態の加熱用コイルＣの構成の有用性及び優位性が確認された。 Then, as shown in FIG. 8, in the frequency band (10 kilohertz to 100 kilohertz) of the high frequency power supplied from the power supply unit 9 of the embodiment and the power supply unit (not shown) of the conventional example, respectively, for heating of the embodiment. It can be seen that the case where the coil C is used has a higher inductance than the case where the heating coil X of the conventional example is used. Further, as shown in FIG. 9, in the band of the above frequency, the Q value is higher (that is, the loss is smaller) when the heating coil C of the embodiment is used than when the heating coil X of the conventional example is used. It turns out. As described above, the usefulness and superiority of the configuration of the heating coil C of the embodiment have been confirmed by the experiment by the inventor of the present invention.
　以上それぞれ説明したように、実施形態の加熱用コイルＣを含む実施形態の調理器１の構成によれば、銅薄膜線Ｌ１の巻回からなるコイルＣ１と、銅薄膜線Ｌ２の巻回からなり且つ絶縁層ＢＦを挟んでコイルＣ１に積層されたコイルＣ２と、を備え、銅薄膜線Ｌ１の各巻回の加熱用コイルＣの中心から見た位置と、銅薄膜線Ｌ２の各巻回の当該中心から見た位置と、が、巻回遷移領域ＣＲ１及び巻回遷移領域ＣＲ２を除き、加熱用コイルＣの平面視において一致している（図４参照）。よって、軽量化及び薄型化を目的として加熱用コイルＣの巻回線を銅薄膜線Ｌ１により形成することに起因する表皮効果又は近接効果による加熱用コイルＣとしての交流抵抗を低減することができ、当該軽量化及び薄型化と、加熱用コイルＣ自体としての伝送効率の向上及び動作温度の上昇の防止と、を両立させることができる。 As described above, according to the configuration of the cooker 1 of the embodiment including the heating coil C of the embodiment, the coil C1 is composed of the winding of the copper thin film wire L1 and the copper thin film wire L2 is wound. Further, the coil C2 laminated on the coil C1 with the insulating layer BF interposed therebetween is provided, and the position seen from the center of the heating coil C of each winding of the copper thin film wire L1 and the center of each winding of the copper thin film wire L2. The position seen from the above is the same in the plan view of the heating coil C except for the winding transition region CR1 and the winding transition region CR2 (see FIG. 4). Therefore, it is possible to reduce the AC resistance of the heating coil C due to the skin effect or proximity effect caused by forming the winding line of the heating coil C with the copper thin film wire L1 for the purpose of weight reduction and thinning. It is possible to achieve both the weight reduction and the thinning, the improvement of the transmission efficiency of the heating coil C itself, and the prevention of an increase in the operating temperature.
　また、巻回遷移領域ＣＲ１と巻回遷移領域ＣＲ２とが、加熱用コイルＣにおける一の半径に沿った位置に形成されている（図２乃至図４参照）。よって、加熱用コイルＣの中心から見た位置が平面視において一致する銅薄膜線Ｌ１の巻回の部分と銅薄膜線Ｌ２の巻回の部分とを増やすことで、伝送効率をより向上させると共に動作温度の上昇をより防止することができる。 Further, the winding transition region CR1 and the winding transition region CR2 are formed at positions along one radius in the heating coil C (see FIGS. 2 to 4). Therefore, by increasing the winding portion of the copper thin film wire L1 and the winding portion of the copper thin film wire L2 whose positions seen from the center of the heating coil C match in a plan view, the transmission efficiency is further improved. It is possible to further prevent the operating temperature from rising.
　更に、銅薄膜線Ｌ１及び銅薄膜線Ｌ２を備えるコイルＣ１の平面視全体形状が円形とされているので、鍋等の被加熱体の一般的な平面視形状に適合させて、効率的に被加熱体を加熱することができる。 Further, since the overall shape of the coil C1 including the copper thin film wire L1 and the copper thin film wire L2 in a plan view is circular, it can be efficiently covered by being adapted to the general plan view shape of a heated body such as a pot. The heated body can be heated.
　更にまた、周縁部コイルＣ１out及び周縁部コイルＣ２outが加熱部１０の平面視における周縁部で巻回され、中心部コイルＣ１in及び中心部コイルＣ２inが加熱部１０の平面視における中心部で巻回されているので、周縁側と中心側の銅薄膜線Ｌ１及び銅薄膜線Ｌ２により、被加熱体を効率的に加熱することができる。 Furthermore, the peripheral coil C1out and the peripheral coil C2out are wound around the peripheral portion in the plan view of the heating portion 10, and the central coil C1in and the central coil C2in are wound around the central portion in the plan view of the heating portion 10. Therefore, the heated body can be efficiently heated by the copper thin film wire L1 and the copper thin film wire L2 on the peripheral side and the center side.
　以上説明したように、本発明は誘導加熱型調理器の分野に利用することが可能であり、特に軽量化及び薄型化が求められる例えば家庭用の誘導加熱型調理器の分野に適用すれば特に顕著な効果が得られる。 As described above, the present invention can be used in the field of induction heating type cookers, and is particularly applicable to the field of induction heating type cookers for home use, for example, where weight reduction and thinning are required. A remarkable effect can be obtained.
　１　　調理器
　２　　本体部
　３　　天板（トッププレート）
　４　　調理用グリル
　５　　吸気窓
　６ａ、６ｂ　　排気窓
　７　　操作パネル
　８ａ、８ｂ　　火力調節ダイヤル
　９　　電力供給部
　１０、２０ａ、２０ｂ　　加熱部
　Ｃ、Ｘ　　加熱用コイル
　Ｆ　　フェライト
　Ｖ　　ビア
　Ｌ１、Ｌ２、ＸＬ１、ＸＬ２　　銅薄膜線
　Ｃ１、Ｃ２、Ｘ１、Ｘ２　　コイル
　ＢＦ　　絶縁層
　Ｏ１、Ｏ２　　外部接続端子
　Ｃ１out、Ｃ２out、Ｘ１out、Ｘ２out　　周縁部コイル
　Ｃ１in、Ｃ２in、Ｘ１in、Ｘ２in　　中心部コイル
　ＣＲ１、ＣＲ２　　巻回遷移領域
  1 Cooker 2 Main body 3 Top plate (top plate)
4 Cooking grill 5 Intake window 6a, 6b Exhaust window 7 Operation panel 8a, 8b Thermal power adjustment dial 9 Power supply unit 10, 20a, 20b Heating unit C, X Heating coil F Ferrite V Via L1, L2, XL1, XL2 Copper Thin film wire C1, C2, X1, X2 coil BF Insulation layer O1, O2 External connection terminal C1out, C2out, X1out, X2out Peripheral coil C1in, C2in, X1in, X2in Central coil CR1, CR2 Winding transition region

Claims (5)

  1. 　誘導加熱による被加熱体の加熱に用いられるコイルにおいて、
    　当該コイルの外周側から内周側に向けて巻回され且つ薄膜導体からなる外内巻回線と、
    　前記内周側から前記外周側に向けて巻回され且つ薄膜導体からなり、絶縁層を挟んで前記外内巻回線に積層された内外巻回線と、
    　を備え、
    　前記外内巻回線の各巻回の前記コイルの中心から見た位置と、前記内外巻回線の各巻回の当該中心から見た位置と、が、平面視において一致していることを特徴とするコイル。     In the coil used for heating the object to be heated by induction heating
    An outer / inner winding line that is wound from the outer peripheral side to the inner peripheral side of the coil and is made of a thin film conductor.
    An inner / outer winding line wound from the inner peripheral side toward the outer peripheral side and made of a thin film conductor and laminated on the outer inner winding line with an insulating layer interposed therebetween.
    Equipped with
    A coil characterized in that the position seen from the center of each winding of the outer and inner winding lines and the position seen from the center of each winding of the inner and outer winding lines coincide with each other in a plan view. ..
  2. 　請求項１に記載のコイルにおいて、
    　前記コイルの半径方向における前記外内巻回線の各前記巻回の遷移部分と、前記内外巻回線の巻回における当該遷移部分と、が、前記コイルにおける一の半径に沿った位置に形成されていることを特徴とするコイル。     In the coil according to claim 1,
    The transition portion of each winding of the outer and inner winding lines in the radial direction of the coil and the transition portion of the winding of the inner and outer winding lines are formed at positions along one radius in the coil. A coil characterized by being present.
  3. 　請求項１又は請求項２に記載のコイルにおいて、
    　前記外内巻回線及び前記内外巻回線を備える当該コイルの平面視全体形状が円形とされていることを特徴とするコイル。     In the coil according to claim 1 or 2.
    A coil comprising the outer-inner winding line and the inner-outer winding line, wherein the entire shape of the coil in a plan view is circular.
  4. 　請求項１から請求項３のいずれか一項に記載のコイルにおいて、
    　前記外内巻回線における巻回の一部及び前記内外巻回線における巻回の一部が、前記中心から見て前記コイルの周縁側に形成されており、
    　前記外内巻回線における巻回の他の一部及び前記内外巻回線における巻回の他の一部が、前記中心から見て前記コイルの当該中心側に形成されていることを特徴とするコイル。     In the coil according to any one of claims 1 to 3.
    A part of the winding in the outer inner winding line and a part of the winding in the inner / outer winding line are formed on the peripheral side of the coil when viewed from the center.
    A coil characterized in that the other part of the winding in the outer inner winding line and the other part of the winding in the inner / outer winding line are formed on the center side of the coil when viewed from the center. ..
  5. 　請求項１から請求項４のいずれか一項に記載のコイルと、
    　前記被加熱体が載置され且つ当該被加熱体と前記コイルとの間に配置された載置板と、
    　前記加熱用の電力を前記コイルに供給する電力供給手段と、
    　を備えることを特徴とする加熱装置。
          The coil according to any one of claims 1 to 4.
    A mounting plate on which the heated body is placed and arranged between the heated body and the coil,
    A power supply means for supplying the heating power to the coil,
    A heating device characterized by being provided with.
PCT/JP2021/032540 2020-09-04 2021-09-03 Coil and heating device WO2022050398A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001297869A (en) * 2000-04-13 2001-10-26 Matsushita Electric Ind Co Ltd Heating coil for induction heating device
CN206018744U (en) * 2016-08-30 2017-03-15 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven
JP2020512657A (en) * 2017-03-31 2020-04-23 ブリティッシュ アメリカン タバコ （インヴェストメンツ） リミテッドＢｒｉｔｉｓｈ Ａｍｅｒｉｃａｎ Ｔｏｂａｃｃｏ （Ｉｎｖｅｓｔｍｅｎｔｓ） Ｌｉｍｉｔｅｄ Induction coil structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001297869A (en) * 2000-04-13 2001-10-26 Matsushita Electric Ind Co Ltd Heating coil for induction heating device
CN206018744U (en) * 2016-08-30 2017-03-15 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven
JP2020512657A (en) * 2017-03-31 2020-04-23 ブリティッシュ アメリカン タバコ （インヴェストメンツ） リミテッドＢｒｉｔｉｓｈ Ａｍｅｒｉｃａｎ Ｔｏｂａｃｃｏ （Ｉｎｖｅｓｔｍｅｎｔｓ） Ｌｉｍｉｔｅｄ Induction coil structure

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