Coil unit

Abstract

Provided is a coil unit capable of reducing the number of temperature sensors. This coil unit is provided with: a plurality of coils disposed in a plurality of heating regions in which an object to be heated is heated in plan view; and one or more temperature sensors disposed in the plurality of heating regions, the plurality of heating regions having a first heating region and a second heating region partially overlapping the first heating region in a plan view, and a non-heating region in which no coil is disposed around the plurality of heating regions in a plan view. The one or more temperature sensors include a first temperature sensor disposed in an overlapping region where the first heating region and the second heating region overlap in plan view.

Description

Technical Field

[0001] The present disclosure relates to a coil unit. Background Art

[0002] For example, Patent Document 1 discloses an induction heating cooker. The induction heating cooker described in Patent Document 1 has a top plate, a plurality of heating coils, and a plurality of temperature detection units. In the induction heating cooker described in Patent Document 1, a plurality of temperature detection units are dispersedly arranged below the top plate in such a manner that when a heated object is arranged above two heating coils adjacent to each other, at least one temperature detection unit is located below the heated object. Alternatively, in the induction heating cooker described in Patent Document 1, a plurality of temperature detection units are dispersedly arranged below the top plate in such a manner that at least one temperature detection unit is associated with two heating coils adjacent to each other.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2014 / 064922 Summary of the invention

[0006] In recent years, there has been a demand for reducing the number of temperature sensors in a coil unit that performs induction heating in a plurality of heating regions in which a plurality of coils are arranged.

[0007] An object of the present disclosure is to provide a coil unit in which a plurality of heating regions including a plurality of coils are provided to perform induction heating, and in which the number of temperature sensors is reduced.

[0008] The coil unit disclosed in the present invention comprises: a plurality of coils, which are arranged in a plurality of heating areas for heating a heating object when viewed from above; and one or more temperature sensors, which are arranged in the plurality of heating areas, the plurality of heating areas having a first heating area and a second heating area partially overlapping with the first heating area when viewed from above, and a non-heating area without coils arranged around the plurality of heating areas when viewed from above, the one or more temperature sensors including a first temperature sensor, which is arranged in an overlapping area where the first heating area overlaps with the second heating area when viewed from above.

[0009] According to the present disclosure, it is possible to provide a coil unit in which a plurality of heating regions including a plurality of coils are arranged to perform induction heating and in which the number of temperature sensors is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic perspective view of an example of the induction heating cooker according to the first embodiment of the present disclosure.

[0011] Figure 2 It is a schematic plan view of an example of the induction heating cooker according to the first embodiment of the present disclosure.

[0012] Figure 3 It is a top view of an example of the coil unit according to the first embodiment of the present disclosure.

[0013] Figure 4 This is a schematic diagram showing an example of the arrangement relationship between a plurality of coils and a plurality of temperature sensors according to the first embodiment of the present disclosure.

[0014] Figure 5 It is composed Figure 4 A schematic enlarged view of the coil of the coil unit.

[0015] Figure 6 FIG. 1 is a schematic diagram showing the arrangement of temperature sensors arranged in the overlapping region.

[0016] Figure 7 This is a schematic diagram showing an example of the arrangement relationship of a plurality of temperature sensors according to the first embodiment of the present disclosure.

[0017] Figure 8 It means cutting with AA line Figure 3 A schematic cross-sectional view of a cross section obtained through a coil unit.

[0018] Fig. 9 1 is a schematic diagram showing the structure of a coil unit according to Modification 1.

[0019] Fig.10 It is a schematic diagram showing the structure of the coil unit according to Modification Example 2.

[0020] Description of Reference Numerals

[0021] 1: induction heating cooker; 2: top plate; 3: shell; 4: coil unit; 5: coil unit; 6: indication; 7: transmission window; 10A~10J: coil; 21: first temperature sensor; 22: second temperature sensor; 23: third temperature sensor; 30: shell; 31: casing. DETAILED DESCRIPTION

[0022] (The process of completing this disclosure)

[0023] The induction heating cooker described in Patent Document 1 has a structure that can freely determine the placement location of a heating object such as a pot relative to a top plate. Therefore, in order to detect the temperature of the heating object when the heating object is placed at any position on the top plate, a plurality of temperature sensors are evenly distributed relative to the top plate. Therefore, in the induction heating cooker described in Patent Document 1, there is still room for improvement in reducing the number of temperature sensors.

[0024] Therefore, the present inventors have found a structure of a coil unit in which a temperature sensor is arranged in an overlapping region where a plurality of heating regions in which a plurality of coils are arranged overlap when viewed from above, and have completed the present disclosure.

[0025] The following describes the embodiments in detail with reference to the accompanying drawings as appropriate. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to make it easy for those skilled in the art to understand.

[0026] In addition, the inventor (etc.) provides the drawings and the following descriptions in order to enable those skilled in the art to fully understand the present disclosure, but does not intend to limit the subject matter described in the claims by these.

[0027] (Implementation Method 1)

[0028] [Induction heating cooker]

[0029] Figure 1 It is a schematic perspective view of an example of the induction heating cooker 1 according to the first embodiment of the present disclosure. Figure 2 1 is a schematic top view of an example of an induction heating cooker 1 according to Embodiment 1 of the present disclosure. In addition, the XYZ coordinate system shown in the figure is used to help understand the invention and does not limit the invention. The X-axis direction represents the left-right direction, the Y-axis direction represents the depth direction, and the Z-axis direction represents the vertical direction.

[0030] like Figure 1 and Figure 2 As shown, the induction heating cooker 1 is a cooker that performs induction heating on a cooking container C that accommodates a heating object T. In this specification, the cooking container C is a pot, which is described as an example of a heating object. The heating object is not limited to the cooking container C, and any object that can be induction heated can be used.

[0031] The induction heating cooker 1 includes: a top plate 2, on which a cooking container C is placed, and which is made of, for example, heat-resistant glass; and a shell 3, which is mounted on the lower surface of the top plate 2. A plurality of coil units 4 and 5 are mounted in the shell 3. The plurality of coil units 4 and 5 are respectively arranged below the top plate 2 to perform induction heating on the cooking container C placed on the opposite parts of the top plate 2. That is, the plurality of coil units 4 and 5 function as induction heating coil units, respectively. In the present embodiment, the coil unit 5 is arranged between the two coil units 4 when viewed from above. In addition, the coil unit 5 has a different structure from the coil unit 4. In this specification, "viewed from above" means observing from the vertical direction, that is, the Z-axis direction.

[0032] A plurality of indications 6 are displayed on the top plate 2. The plurality of indications 6 demarcate an area on the top plate 2 for placing the cooking container C. The plurality of indications 6 have a straight line shape. When viewed from above, the plurality of indications 6 are located on both sides of the plurality of coil units 4. In the present embodiment, three indications 6 are shown on both sides of the plurality of coil units 4. The three indications 6 extend in the depth direction (Y direction) of the induction heating cooker 1, with gaps between them.

[0033] The plurality of indications 6 can be realized, for example, by light emitted by a plurality of light emitting units arranged below the top plate 2. A transmission window for transmitting light emitted from the light emitting unit can be provided on the top plate 2. The light emitting unit can also be provided on the coil unit 4. Alternatively, the plurality of indications 6 can be lines physically drawn on the top plate 2.

[0034] In a plan view, a plurality of heating regions S1 and S2 inductively heated by the plurality of coil units 4 and a non-heating region NS1 not inductively heated by the plurality of coil units 4 are arranged in an area defined by the plurality of indicators 6. In a plan view, the plurality of heating regions S1 and S2 form an overlapping region DS1 overlapping each other. In a plan view, the non-heating region NS1 is arranged around the plurality of heating regions S1 and S2. The non-heating region NS1 is an area where no coil is configured.

[0035] A plurality of transmission windows 7 are provided on the top plate 2. In the present embodiment, a plurality of non-contact temperature sensors are arranged below the top plate 2, so that the plurality of non-contact temperature sensors detect the temperature of the cooking container C through the plurality of transmission windows 7. The transmission windows 7 are arranged on the center line of the width of each coil unit 4 in the X-axis direction when viewed from above.

[0036] The induction heating cooker 1 includes a control unit for controlling the coil units 4 and 5. The control unit includes, for example, a memory storing a program and a processing circuit corresponding to a processor such as a CPU (Central Processing Unit). In the control unit, the processor executes the program stored in the memory.

[0037] [Coil unit]

[0038] Next, use Figure 3 to Figure 7 , the coil unit 4 is described.

[0039] Figure 3 It is a plan view of an example of the coil unit 4 according to the first embodiment of the present disclosure. Figure 4 This is a schematic diagram showing an example of the arrangement relationship between the plurality of coils 10A to 10J and the plurality of temperature sensors 21 to 23 according to the first embodiment of the present disclosure. Figure 5 It is composed Figure 4 Schematic enlarged view of coil 10A of coil unit 4. Figure 61 is a schematic diagram showing the arrangement of the temperature sensor 21 arranged in the overlapping area DS1. Figure 7 It is a schematic diagram showing an example of the arrangement relationship of the plurality of temperature sensors 21 to 23 according to the first embodiment of the present disclosure. Figure 8 It means that the AA line will Figure 3 Schematic cross-sectional view of a cross section obtained by cutting the coil unit 4.

[0040] like Figure 3 As shown, the coil unit 4 includes a plurality of coils 10A to 10J, a plurality of temperature sensors 21 to 23 , and a housing 30 .

[0041] like Figure 4 As shown, the plurality of coils 10A to 10J are arranged in a plurality of heating regions S1 and S2 for heating a heating target in a plan view.

[0042] The plurality of heating regions S1 and S2 include a first heating region S1 and a second heating region S2. In the present embodiment, in the depth direction (Y direction), the first heating region S1 is located on the front side relative to the second heating region S2.

[0043] In addition, when viewed from above, a part of the first heating area S1 overlaps a part of the second heating area S2. The area where the first heating area S1 overlaps with the second heating area S2 when viewed from above is defined as an overlapping area DS1. In the present embodiment, one coil unit 4 is configured to be able to operate as a whole through an inverter circuit. "Able to operate as a whole" means that in order to heat a common heating object, the control unit can operate the first heating area S1 and the second heating area S2 in combination. "Able to operate as a whole" may also mean that the magnetic field generated by the high-frequency current flowing in each coil 10A~10J is generated while being affected by the high-frequency current of the adjacent coils 10A~10J, and can act in a manner that heats the common heating object. In the present embodiment, among the heating areas composed of a plurality of heating coils that can be operated by an inverter circuit, the only heating area of ​​the same size as the first heating area S1 is the second heating area S2. Thus, it is possible to provide the convenience of cooking while moving the pot from the first heating area S1 to the second heating area S2 or from the second heating area S2 to the first heating area S1. On the other hand, by determining the heating area to a certain extent, the coil unit 4 can be controlled in consideration of the user's usage, and the heating efficiency can be improved. In addition, by determining the heating area to a certain extent, it is possible to avoid the user's operation becoming complicated.

[0044] In addition, a non-heating region NS1 where no coil is arranged is provided around the plurality of heating regions S1 and S2 in a plan view. In a plan view, the non-heating region NS1 is provided in a region defined by the plurality of indicators 6 located around the plurality of heating regions S1 and S2.

[0045] The first heating area S1 is an area where induction heating is performed by a plurality of coils 10A to 10F. In other words, the first heating area S1 is an area having a center C1 when viewed from above, and is an area where a plurality of coils 10A to 10F are arranged. In the first heating area S1, a plurality of coils 10A to 10F are arranged adjacent to each other. Specifically, when viewed from above, a plurality of coils 10A to 10F are radially arranged in the first heating area S1. In the present embodiment, the first heating area S1 has a circular shape when viewed from above. In addition, the first heating area S1 is not limited to a circular shape when viewed from above, and may also have a polygonal shape.

[0046] The first heating area S1 has a plurality of coil configuration areas S11 to S16. The plurality of coil configuration areas S11 to S16 are radially and adjacently configured with the center C1 of the first heating area S1 as the center when viewed from above. Specifically, the plurality of coil configuration areas S11 to S16 are defined by a plurality of boundary lines L11 to L16 extending radially from the center C1 of the first heating area S1 toward the periphery when viewed from above and an outer peripheral line L1 defining the outer periphery of the first heating area S1.

[0047] The plurality of boundary lines L11 to L16 are arranged at equal intervals in a radial pattern with the center C1 of the first heating area S1 as the center when viewed from above. The plurality of boundary lines L11 to L16 are straight lines extending from the center C1 of the first heating area S1 toward the periphery when viewed from above. The angles formed by two adjacent boundary lines among the plurality of boundary lines L11 to L16 are approximately the same. Thus, the plurality of coil configuration areas S11 to S16 have approximately the same shape and approximately the same size when viewed from above. In this specification, "approximately" means within a 10% error, preferably within a 5% error.

[0048] Each of the plurality of coil arrangement regions S11 to S16 has a fan shape in plan view. In this specification, a “fan shape” refers to a shape defined by two straight lines (radii) extending from the center of a circle toward the outer circumference in plan view and an arc connecting the two straight lines.

[0049] In this embodiment, the plurality of boundary lines include six boundary lines L11 to L16, and the angle between two adjacent boundary lines is 60 degrees. Thus, the first heating region S1 is divided into six coil arrangement regions S11 to S16 having substantially the same shape and size in a plan view.

[0050] The plurality of coils 10A to 10F are respectively arranged in the plurality of coil arrangement regions S11 to S16 in a plan view. Thus, the plurality of coils 10A to 10F are arranged radially and adjacently in the first heating region S1 in a plan view.

[0051] In the present embodiment, the plurality of coils 10A to 10F include a first coil 10A, a second coil 10B, a third coil 10C, a fourth coil 10D, a fifth coil 10E, and a sixth coil 10F. The first coil 10A to the sixth coil 10F are arranged in the plurality of coil arrangement regions S11 to S16, respectively.

[0052] The second heating area S2 is an area where induction heating is performed by a plurality of coils 10A, 10F, 10G to 10J. In other words, the second heating area S2 is an area having a center C2 when viewed from above, and is an area where a plurality of coils 10A, 10F, 10G to 10J are arranged. In the second heating area S2, a plurality of coils 10A, 10F, 10G to 10J are arranged adjacent to each other. Specifically, in a top view, a plurality of coils 10A, 10F, 10G to 10J are radially arranged in the second heating area S2. In the present embodiment, the second heating area S2 has a circular shape when viewed from above. In addition, the second heating area S2 is not limited to a circular shape when viewed from above, and may also have a polygonal shape.

[0053] The second heating area S2 has a plurality of coil configuration areas S21 to S26. When viewed from above, the plurality of coil configuration areas S21 to S26 are radially and adjacently configured with the center C2 of the second heating area S2 as the center. Specifically, the plurality of coil configuration areas S21 to S26 are defined by a plurality of boundary lines L21 to L26 extending radially from the center C2 of the second heating area S2 toward the periphery when viewed from above, and an outer peripheral line L2 defining the outer periphery of the second heating area S2.

[0054] The plurality of boundary lines L21 to L26 are arranged at equal intervals in a radial pattern with the center C2 of the second heating area S2 as the center when viewed from above. The plurality of boundary lines L21 to L26 are straight lines extending from the center C2 of the second heating area S2 toward the periphery when viewed from above. The angles formed by two adjacent boundary lines among the plurality of boundary lines L21 to L26 are substantially the same. Thus, the plurality of coil configuration areas S21 to S26 have substantially the same shape and substantially the same size when viewed from above.

[0055] Each of the plurality of coil arrangement regions S21 to S26 has a fan-shaped shape in a plan view.

[0056] In this embodiment, the plurality of boundary lines in the second heating region S2 includes six boundary lines L21 to L26, and the angle between two adjacent boundary lines is 60 degrees. Thus, the second heating region S2 is divided into six coil configuration regions S21 to S26 of substantially the same shape and size in a plan view.

[0057] In the present embodiment, the two coil arrangement areas S21 and S22 in the second heating area S2 overlap with the two coil arrangement areas S11 and S16 in the first heating area S1. The area where the coil arrangement areas S11, S16, S25, and S26 overlap is an overlapping area DS1.

[0058] The plurality of coils 10A, 10F, 10G to 10J are respectively arranged in the plurality of coil arrangement regions S21 to S26 in a plan view. Thus, the plurality of coils 10A, 10F, 10G to 10J are arranged radially and adjacently in the second heating region S2 in a plan view.

[0059] In the present embodiment, the plurality of coils 10G to 10J include a seventh coil 10G, an eighth coil 10H, a ninth coil 10I, and a tenth coil 10J.

[0060] The seventh coil 10G to the tenth coil 10J are arranged in the plurality of coil arrangement areas S21 to S24. The first coil 10A and the sixth coil 10F are arranged in the two coil arrangement areas S25 and S26. That is, the first coil 10A and the sixth coil 10F are shared by the first heating area S1 and the second heating area S2.

[0061] In the present embodiment, the first coil 10A and the sixth coil 10F are arranged in the overlapping area DS1. The first coil 10A and the sixth coil 10F may be referred to as "overlapping coils 10A, 10F", respectively.

[0062] use Figure 5 , the detailed structure of the first coil 10A is described.

[0063] like Figure 5 As shown, the first coil 10A includes a coil body 11 , outer lead wires 12 , and inner lead wires 13 .

[0064] The coil body 11 is a part formed by winding the coil wire. The coil body 11 has a frame shape when viewed from above. In the present embodiment, the coil body 11 has a fan shape when viewed from above. In addition, the shape of the coil body 11 is not limited to the fan shape, and may also have an arbitrary shape. For example, the coil body 11 may also have a triangular or polygonal shape when viewed from above.

[0065] In a plan view, a space SP1 is provided inside the coil body portion 11. The space SP1 is a space defined inside by winding the coil wire.

[0066] The outer lead wire 12 is a lead wire led out from the outside of the coil body portion 11 .

[0067] The inner lead wire 13 is a lead wire led out from the inner side of the coil body portion 11 .

[0068] Terminals are provided at the ends of the outer lead wires 12 and the inner lead wires 13. The terminals are, for example, round terminals.

[0069] In the present embodiment, the first coil 10A is formed of a single coil wire. The coil wire is formed of, for example, a conductive material.

[0070] In the present embodiment, the second coil 10B to the tenth coil 10J have the same structure as the first coil 10A. Therefore, in the first coil 10A to the tenth coil 10J, the lengths of the plurality of outer lead wires 12 are equal. In addition, in the first coil 10A to the tenth coil 10J, the lengths of the plurality of inner lead wires 13 are equal. In this way, the plurality of coils 10A to 10F are all composed of substantially the same coils, thereby reducing manufacturing costs.

[0071] Furthermore, the length of the outer lead wire 12 and the length of the inner lead wire 13 may be different or equal.

[0072] The outer lead wires 12 and the inner lead wires 13 of the plurality of coils 10A to 10J are connected to each other, for example, through a connection portion disposed in the housing 30. The connection portion is, for example, a bus bar. The bus bar is, for example, a plate formed of a conductive material. In addition, the connection portion may also be a substrate. For example, the outer lead wires 12 or the inner lead wires 13 may be connected to an electrode or a wiring pattern disposed on the substrate.

[0073] The heating of the plurality of coils 10A to 10J is controlled by the control unit of the induction heating cooker 1. In the present embodiment, the control unit controls the heating of the plurality of coils 10A to 10F based on the first heating area S1, the heating of the plurality of coils 10A, 10F, 10G to 10J based on the second heating area S2, and the heating of the plurality of coils 10A to 10J based on the first heating area S1 and the second heating area S2.

[0074] return Figure 4 The plurality of temperature sensors 21 to 23 are arranged in the plurality of heating regions S1 and S2 in a plan view, and detect the temperature of the cooking container C placed on the top plate 2 .

[0075] The plurality of temperature sensors 21 to 23 include a first temperature sensor 21, a second temperature sensor 22, and a third temperature sensor 23. In the present embodiment, the first temperature sensor 21 is a contact temperature sensor, such as a thermistor or a thermocouple. The second temperature sensor 22 and the third temperature sensor 23 are non-contact temperature sensors, such as infrared sensors.

[0076] The first temperature sensor 21 is disposed in the overlapping region DS1 in a plan view. The first temperature sensor 21 contacts the lower surface of the top plate 2 on which the cooking container C is placed in the overlapping region DS1 to detect the temperature.

[0077] like Figure 6 As shown, the first temperature sensor 21 is arranged in a space SP1 provided on the inner side of the sixth coil 10F. When viewed from above, when an inscribed circle CL1 tangential to the inner side of the sixth coil 10F is drawn in the space SP1 of the sixth coil 10F, the first temperature sensor 21 is arranged at the center C10 of the inscribed circle CL1. Specifically, when viewed from above, the center of the first temperature sensor 21 is arranged so as to overlap with the center C10 of the inscribed circle CL1. In addition, the "inscribed circle CL1" in this specification refers to the circle with the largest diameter among the circles drawn in the space SP1 of the sixth coil 10F when viewed from above. The diameter of the sensing surface of the first temperature sensor 21 is smaller than the diameter of the inscribed circle. The sensing surface is, for example, a temperature measuring surface or a light receiving surface. The first temperature sensor 21 is assembled from the lower side of the sixth coil 10F toward the top plate 2 through the space SP1 of the sixth coil 10F.

[0078] The diameter D10 of the inscribed circle CL1 satisfies the following formula (1).

[0079] [Mathematical formula 1]

[0080]

[0081] D10: Diameter of the inscribed circle (mm)

[0082] Vc: coil voltage (V)

[0083] Ac: Coil current (A)

[0084] Fc: frequency (Hz)

[0085] In addition, the first temperature sensor 21 may be disposed in the overlapping area DS1. For example, the first temperature sensor 21 may be disposed in the space SP1 inside the first coil 10A. Alternatively, the first temperature sensor 21 may be disposed in a portion of the overlapping area DS1 where the first coil 10A and the sixth coil 10F are not disposed when viewed from above.

[0086] return Figure 4, the second temperature sensor 22 is arranged in the first heating area S1 when viewed from above. The second temperature sensor 22 is arranged outside the overlapping area DS1 when viewed from above and is not arranged in the overlapping area DS1. In addition, the second temperature sensor 22 is arranged in a portion of the first heating area S1 where the multiple coils 10A to 10F are not arranged when viewed from above. Specifically, the second temperature sensor 22 is arranged near the center C1 of the first heating area S1 when viewed from above. In the present embodiment, the second temperature sensor 22 is arranged on the near front side in the depth direction (Y direction) compared to the center C1 of the first heating area S1. In addition, the second temperature sensor 22 is arranged on the center line of the width of the coil unit 4 in the X-axis direction when viewed from above.

[0087] The second temperature sensor 22 detects the temperature of the cooking container C placed on the top plate 2 in the first heating area S1 in a non-contact manner. In addition, a transmission window 7 is provided on the top plate 2 above the second temperature sensor 22. When the second temperature sensor 22 is an infrared sensor, infrared light passes through the transmission window 7, thereby detecting the temperature of the cooking container C.

[0088] In addition, the vicinity of the center C1 in the first heating area S1 is an area where the plurality of coils 10A to 10F are not arranged, and the second temperature sensor 22 is easily arranged. In addition, the vicinity of the center C1 in the first heating area S1 is located on the center line of the width of the coil unit 4 in the X-axis direction when viewed from above, and even if the transmission window 7 is provided on the top plate 2, it is difficult to hinder the regular design of the top plate 2. However, for the purpose of realizing the temperature measurement function of the second temperature sensor 22, the second temperature sensor 22 can be arranged in the first heating area S1. For example, the second temperature sensor 22 can be arranged in the gap between the plurality of coils 10B to 10E. In the case of a method in which the heating operation can be performed only by the heating area after the overlapping area DS1 is removed from the first heating area S1, it is preferred that the second temperature sensor 22 is entirely arranged in the first heating area S1 and arranged outside the overlapping area DS1. In the case of a method in which the first heating area S1 and the overlapping area DS1 perform a heating operation together, the second temperature sensor 22 may be partially arranged in the overlapping area DS1, or the second temperature sensor 22 may be entirely arranged in the first heating area S1 and outside the overlapping area DS1. In this embodiment, the sensing surface of the second temperature sensor 22 is disposed in the first heating area S1 and outside the overlapping area DS1.

[0089] The third temperature sensor 23 is arranged in the second heating area S2 when viewed from above. The third temperature sensor 23 is partially arranged in the overlapping area DS1. The third temperature sensor 23 is arranged in a portion of the second heating area S2 where the plurality of coils 10A, 10F, 10G to 10J are not arranged when viewed from above. Specifically, the third temperature sensor 23 is arranged near the center C2 of the second heating area S2 when viewed from above. In the present embodiment, the third temperature sensor 23 is arranged on the near front side in the depth direction (Y direction) compared to the center C2 of the second heating area S2. In addition, the third temperature sensor 23 is arranged on the center line of the width of the coil unit 4 in the X-axis direction when viewed from above.

[0090] The third temperature sensor 23 detects the temperature of the cooking container C placed on the top plate 2 in the second heating area S2 in a non-contact manner. In addition, a transmission window 7 is provided on the top plate 2 above the third temperature sensor 23. When the third temperature sensor 23 is an infrared sensor, infrared light passes through the transmission window 7, thereby detecting the temperature of the cooking container C.

[0091] In addition, the vicinity of the center C2 in the second heating area S2 is an area where a plurality of coils 10G to 10J are not arranged, and the third temperature sensor 23 is easily arranged. In addition, the vicinity of the center C2 in the second heating area S2 is located on the center line of the width of the coil unit 4 in the X-axis direction when viewed from above, and even if the transmission window 7 is provided on the top plate 2, it is difficult to hinder the regular design of the top plate 2. However, for the purpose of realizing the temperature measurement function of the third temperature sensor 23, the third temperature sensor 23 can be arranged in the second heating area S2. The third temperature sensor 23 may not be arranged in the overlapping area DS1. For example, the third temperature sensor 23 may also be arranged in the gap between the plurality of coils 10G to 10J.

[0092] Next, use Figure 7 The arrangement relationship of the plurality of temperature sensors 21 to 23 will be described.

[0093] like Figure 7 As shown, in a plan view, the first distance D11 between the first temperature sensor 21 and the second temperature sensor 22 is greater than 1 / 4 times and less than 3 / 4 times the diameter D1 of the first heating area S1. In addition, in a plan view, the second distance D12 between the first temperature sensor 21 and the third temperature sensor 23 is greater than 1 / 4 times and less than 3 / 4 times the diameter D2 of the second heating area S2. Thus, it is easy to detect the displacement of the cooking container C, etc.

[0094] The first distance D11 is a distance connecting the center of the first temperature sensor 21 and the center of the second temperature sensor 22 by a straight line in a plan view. The second distance D12 is a distance connecting the center of the first temperature sensor 21 and the center of the third temperature sensor 23 by a straight line in a plan view.

[0095] In this embodiment, the first distance D11 is greater than the second distance D12.

[0096] In addition, in the present embodiment, different temperature sensors are used for the second temperature sensor 22 and the third temperature sensor 23. For example, the temperature detection range of the second temperature sensor 22 is different from the temperature detection range of the third temperature sensor 23. Specifically, the detection range of the second temperature sensor 22 is larger than the detection range of the third temperature sensor 23. Thus, by using a temperature sensor having sufficient performance required for temperature detection, the manufacturing cost can be reduced.

[0097] return Figure 3 The housing 30 accommodates the plurality of coils 10A to 10J and the plurality of temperature sensors 21 to 23. The housing 30 has a substantially rectangular shape in a plan view. The housing 30 is formed of, for example, an insulating material. For example, the housing 30 is formed of resin.

[0098] like Figure 8 As shown, the housing 30 includes a casing 31 surrounding the second temperature sensor 22 and the third temperature sensor 23 .

[0099] The housing 31 surrounds the second temperature sensor 22 and the third temperature sensor 23 in a plan view. The housing 31 is formed of a material having insulating properties.

[0100] In the present embodiment, the second temperature sensor 22 and the third temperature sensor 23 are non-contact temperature sensors. By surrounding the second temperature sensor 22 and the third temperature sensor 23 with the casing 31, noise from the plurality of coils 10A to 10J can be suppressed.

[0101] Furthermore, since the second temperature sensor 22 and the third temperature sensor 23 are surrounded by the housing 31, noise can be suppressed, and the outer lead wires 12, the inner lead wires 13, the connection parts, etc. of the plurality of coils 10A to 10J can be arranged close to the second temperature sensor 22 and the third temperature sensor 23. Thus, the coil unit 4 can be miniaturized.

[0102] [Effect]

[0103] According to the coil unit 4 of the first embodiment, the following effects can be achieved.

[0104] The coil unit 4 includes a plurality of coils 10A to 10J and a plurality of temperature sensors 21 to 23. The plurality of coils 10A to 10J are arranged in a plurality of heating regions S1 and S2 for heating a heating object when viewed from above. The plurality of temperature sensors 21 to 23 are arranged in the plurality of heating regions S1 and S2. The plurality of heating regions S1 and S2 include a first heating region S1 and a second heating region S2 partially overlapping with the first heating region S1. When viewed from above, a non-heating region NS1 in which no coils are arranged is provided around the plurality of heating regions S1 and S2. The plurality of temperature sensors 21 to 23 include a first temperature sensor 21, which is arranged in an overlapping region DS1 in which the first heating region S1 overlaps with the second heating region S2 when viewed from above.

[0105] With such a structure, the number of temperature sensors can be reduced in the coil unit 4 that performs induction heating in multiple heating areas S1 and S2. In the coil unit 4, the first temperature sensor 21 is arranged in the overlapping area DS1 where the first heating area S1 and the second heating area S2 overlap each other when viewed from above and are surrounded by the non-heating area NS1. Thus, the first temperature sensor 21 can detect the temperature of the heated object in both the heating in the first heating area S1 and the heating in the second heating area S2. As a result, the first temperature sensor 21 can cover the detection of the temperature in the multiple heating areas S1 and S2, so the number of temperature sensors can be reduced.

[0106] In addition, in the coil unit 4 , the first temperature sensor 21 can detect the temperatures in the plurality of heating regions S1 and S2 , thereby reducing the number of components and manufacturing costs. In addition, the number of man-hours required to assemble the coil unit 4 can be reduced.

[0107] Furthermore, by reducing the number of temperature sensors in the coil unit 4, the cooling air passage can be enlarged, thereby improving the cooling efficiency.

[0108] The first heating area S1 and the second heating area S2 have a circular or polygonal shape in a plan view. In the first heating area S1 and the second heating area S2, a plurality of coils 10A to 10J are radially arranged. With such a structure, the heating efficiency can be improved and the number of temperature sensors can be further reduced.

[0109] The plurality of coils 10A to 10J each have a fan-shaped, triangular or polygonal shape when viewed from above. With such a structure, the plurality of coils 10A to 10J can be arranged closer together. Thus, the size of the plurality of heating areas S1 and S2 can be reduced, so that the first temperature sensor 21 can easily cover the detection of the temperature in the plurality of heating areas S1 and S2.

[0110] The plurality of coils 10A to 10J include an overlapping coil 10F disposed in an overlapping area DS1. The overlapping coil 10F has a space SP1 inside when viewed from above. The first temperature sensor 21 is disposed in the space SP1 of the overlapping coil 10F when viewed from above. With such a structure, the first temperature sensor 21 can be disposed by effectively utilizing the space SP1 inside the overlapping coil 10F. Thus, the first temperature sensor 21 can be disposed without changing the arrangement or shape of the overlapping coil 10F.

[0111] The plurality of coils 10A to 10J have the same outer diameter shape. With such a structure, it is possible to improve assemblability and reduce manufacturing costs.

[0112] The plurality of temperature sensors 21 to 23 include a second temperature sensor 22 disposed in the first heating region S1 when viewed from above. The second temperature sensor 22 is disposed outside the overlapping region DS1 when viewed from above. With such a structure, the temperature in the first heating region S1 can be detected using the first temperature sensor 21 and the second temperature sensor 22. Thus, the displacement of the heated object can be detected.

[0113] The first temperature sensor 21 is a contact type temperature sensor. With such a configuration, the temperature of the heating object can be accurately detected in the overlap region DS1.

[0114] The second temperature sensor 22 is a non-contact temperature sensor. With such a configuration, the temperature of the heating object can be easily detected in the first heating region S1.

[0115] The plurality of temperature sensors 21 to 23 include a third temperature sensor 23 disposed in the second heating region S2 in a plan view. The detection range of the second temperature sensor 22 is different from the detection range of the third temperature sensor 23. With such a structure, temperature sensors with detection ranges corresponding to the plurality of heating regions S1 and S2 can be used. Thus, the manufacturing cost can be reduced.

[0116] The second temperature sensor 22 and the third temperature sensor 23 are surrounded by an insulating housing 31 in a plan view. With such a structure, it is possible to reduce noise entering the second temperature sensor 22 and the third temperature sensor 23, which are non-contact temperature sensors.

[0117] The second temperature sensor 22 is arranged in a portion of the first heating region S1 where the plurality of coils 10A to 10F are not arranged when viewed from above. With such a structure, the space where the plurality of coils 10A to 10F are not arranged can be effectively utilized to arrange the second temperature sensor 22. Thus, the second temperature sensor 22 can be arranged without changing the arrangement and shape of the plurality of coils 10A to 10F.

[0118] When viewed from above, in the space SP1 of the overlapping coil 10F, an inscribed circle CL1 tangent to the inner side of the overlapping coil 10F is drawn, and the first temperature sensor 21 is arranged at the center C10 of the inscribed circle CL1. In addition, the diameter D10 of the inscribed circle CL1 satisfies the formula (1). With such a structure, it is possible to suppress the heat transfer of the overlapping coil 10F to the first temperature sensor 21 which is a contact type sensor. In addition, it is possible to suppress the first temperature sensor 21 from being inductively heated by the overlapping coil 10F. As a result, the detection accuracy of the temperature by the first temperature sensor 21 is improved.

[0119] The first heating area S1 has a circular shape when viewed from above. When viewed from above, the distance D11 between the first temperature sensor 21 and the second temperature sensor 22 is greater than 1 / 4 times and less than 3 / 4 times the diameter D1 of the first heating area S1. With such a structure, the offset of the heating object can be detected with high accuracy in the first heating area S1. Similarly, the second heating area S2 has a circular shape when viewed from above. When viewed from above, the distance between the third temperature sensor 23 and the second temperature sensor 22 can be greater than 1 / 4 times and less than 3 / 4 times the diameter of the second heating area S2. With such a structure, the offset of the heating object can be detected with high accuracy in the second heating area S2.

[0120] In a plan view, the non-heating area NS1 is provided in an area defined by the plurality of indicators 6 located around the plurality of heating areas S1 and S2. With such a configuration, the number of temperature sensors can be further reduced.

[0121] In addition, in this embodiment, although the example in which the coil unit 4 includes ten coils 10A to 10J is described, the present invention is not limited to this. The coil unit 4 only needs to include three or more coils.

[0122] In the present embodiment, the example in which the plurality of coils 10A to 10J are arranged in the two heating regions S1 and S2 is described, but the present invention is not limited thereto. For example, the plurality of coils 10A to 10J may be arranged in two or more heating regions forming the overlapping region DS1.

[0123] In the present embodiment, an example in which there is one overlapping area DS1 is described, but the present invention is not limited thereto. For example, one or more overlapping areas DS1 may be provided.

[0124] In the present embodiment, an example in which two overlapping coils 10A and 10F are arranged in the overlapping region DS1 is described, but the present invention is not limited thereto. For example, one or more overlapping coils shared by a plurality of heating regions may be arranged in the overlapping region DS1.

[0125] In this embodiment, an example in which the number of the plurality of coil configuration areas S11 to S16 in the first heating area S1 is six is ​​described, but the present invention is not limited thereto. In addition, an example in which the number of the plurality of coil configuration areas S21 to S26 in the second heating area S2 is six is ​​described, but the present invention is not limited thereto. The number of the plurality of coil configuration areas may be more than two and less than eight.

[0126] In the present embodiment, the coil arrangement regions S11 to S16 and S21 to S26 are described as having substantially the same shape and the same size, but the present invention is not limited thereto. For example, the coil arrangement regions S11 to S16 and S21 to S26 may have different shapes and / or different sizes.

[0127] In the present embodiment, the example in which the plurality of coils 10A to 10J have substantially the same shape and substantially the same size is described, but the present invention is not limited thereto. For example, the plurality of coils 10A to 10J may have different shapes and / or different sizes.

[0128] In the present embodiment, an example in which the plurality of boundary lines L11 to L16 are straight lines extending from the center C1 of the first heating area S1 toward the periphery when viewed from above is described, but the present invention is not limited to this. In addition, an example in which the plurality of boundary lines L21 to L26 are straight lines extending from the center C2 of the second heating area S2 toward the periphery when viewed from above is described, but the present invention is not limited to this. For example, the plurality of boundary lines L11 to L16 may also be curved lines extending from the center C1 of the first heating area S1 toward the periphery when viewed from above. The plurality of boundary lines L21 to L26 may also be curved lines extending from the center C2 of the second heating area S2 toward the periphery when viewed from above.

[0129] In the present embodiment, the coil unit 4 is provided with the first temperature sensor 21, the second temperature sensor 22 and the third temperature sensor 23, but the present invention is not limited thereto. For example, the coil unit 4 may also include at least the first temperature sensor 21. The coil unit 4 may also not include the second temperature sensor 22 and / or the third temperature sensor 23.

[0130] In the present embodiment, an example in which one first temperature sensor 21 is arranged in the overlapping region DS1 is described, but the present invention is not limited thereto. For example, one or more first temperature sensors 21 may be arranged in the overlapping region DS1.

[0131] In the present embodiment, an example in which the first temperature sensor 21 is a contact-type temperature sensor is described, but the present invention is not limited thereto. For example, the first temperature sensor 21 may be a non-contact-type temperature sensor.

[0132] In this embodiment, the first temperature sensor 21 is arranged in the space SP1 inside the overlapping coil 10F, but the present invention is not limited thereto. The first temperature sensor 21 may be arranged in the overlapping region DS1. For example, the first temperature sensor 21 may be arranged outside the overlapping coil 10F in the overlapping region DS1.

[0133] In the present embodiment, the second temperature sensor 22 and the third temperature sensor 23 are described as non-contact temperature sensors, but the present invention is not limited thereto. For example, at least one of the second temperature sensor 22 and the third temperature sensor 23 may be a non-contact temperature sensor.

[0134] In the present embodiment, an example in which the second temperature sensor 22 is arranged in a portion of the first heating region S1 where the plurality of coils 10A to 10F are not arranged is described, but the present invention is not limited thereto. The second temperature sensor 22 only needs to be arranged in the first heating region S1. For example, the second temperature sensor 22 may also be arranged in a space SP1 inside any one of the plurality of coils 10B to 10D arranged in the first heating region S1.

[0135] In the present embodiment, an example in which the third temperature sensor 23 is arranged in a portion of the second heating region S2 where the plurality of coils 10A, 10F, 10G to 10J are not arranged is described, but the present invention is not limited thereto. The third temperature sensor 23 only needs to be arranged in the second heating region S2. For example, the third temperature sensor 23 may also be arranged in a space SP1 inside any one of the plurality of coils 10G to 10J arranged in the second heating region S2.

[0136] When the second temperature sensor 22 or the third temperature sensor 23 is a contact-type temperature sensor and is disposed in the space SP1 inside the coil, the coil in which the second temperature sensor 22 or the third temperature sensor 23 is disposed satisfies the formula (1).

[0137] In the present embodiment, an example in which the non-heating area NS1 is set in an area delimited by a plurality of indications 6 is described, but the present invention is not limited thereto. For example, the non-heating area NS1 may also be set in an area delimited by one or more indications located around the plurality of heating areas S1 and S2 when viewed from above. For example, the non-heating area NS1 may also be set in an area delimited by a frame-shaped indication when viewed from above.

[0138] (Variant 1)

[0139] Fig. 9 1 is a schematic diagram showing the structure of the coil unit 4 according to the first modification.

[0140] like Fig. 9As shown, the plurality of coils 10A to 10J may have the same outer diameter shape except for the two overlapping coils 10A and 10F arranged in the overlapping area DS1. For example, the two overlapping coils 10A and 10F may have an outer shape different from that of the other coils 10B to 10E and 10G to 10J in a plan view.

[0141] In addition, the two overlapping coils 10A and 10F may have a size different from that of the other coils 10B to 10E and 10G to 10J.

[0142] The two overlapping coils 10A and 10F may have the same outer shape and size, or may have different outer shapes and sizes, when viewed from above.

[0143] In Modification 1, two overlapping coils 10A and 10F are arranged in the overlapping region DS1, but the present invention is not limited thereto. One or more overlapping coils having an outer shape different from other coils not arranged in the overlapping region DS1 may be arranged in the overlapping region DS1.

[0144] (Variant 2)

[0145] Fig.10 1 is a schematic diagram showing the structure of the coil unit 4 according to the second modification.

[0146] like Fig.10 As shown, the first temperature sensor 21 can be arranged outside the two overlapping coils 10A and 10F in the overlapping area DS1. For example, when viewed from above, two overlapping coils 10A and 10F are arranged in the overlapping area DS1. The two overlapping coils 10A and 10F are arranged adjacent to each other with a gap SP2. The first temperature sensor 21 can be arranged in the gap SP2 between the two overlapping coils 10A and 10F.

[0147] In a plan view, a distance B1 between the first temperature sensor 21 and the coil 10F, which is the coil closest to the first temperature sensor 21 among the overlapping coils 10A and 10F, satisfies the following formula (2).

[0148] [Mathematical formula 2]

[0149]

[0150] B1: Distance between coil and first temperature sensor (mm)

[0151] Vc: coil voltage (V)

[0152] Ac: Coil current (A)

[0153] Fc: frequency (Hz)

[0154] With such a configuration, it is possible to suppress the heat from the overlapping coil 10F from being transferred to the first temperature sensor 21 which is a contact-type temperature sensor. Thus, the temperature detection by the first temperature sensor 21 can be performed more accurately.

[0155] In Modification 2, the first temperature sensor 21 is arranged in the gap SP2 between the two overlapping coils 10A and 10F, but the present invention is not limited thereto. The first temperature sensor 21 may be arranged in a portion of the overlapping region DS1 where the overlapping coils 10A and 10F are not arranged.

[0156] In addition, the example in which the above formula (2) is applied to the relationship between the first temperature sensor 21 and the overlapping coil 10F is described, but it is not limited to this. For example, when the second temperature sensor 22 or the third temperature sensor 23 is a contact sensor, the above formula (2) can also be applied to the relationship between the second temperature sensor 22 or the third temperature sensor 23 and the closest coil.

[0157] As described above, the above-mentioned embodiments are described as an illustration of the technology in the present disclosure. For this purpose, drawings and detailed descriptions are provided. Therefore, the components recorded in the drawings and detailed descriptions include not only components necessary for solving the problem, but also components necessary for illustrating the above-mentioned technology but not for solving the problem. Therefore, it should not be considered that these non-essential components are essential based on the fact that these non-essential components are recorded in the drawings and detailed descriptions.

[0158] In addition, the above-mentioned embodiments are for illustrating the technology in the present disclosure, and therefore various changes, substitutions, additions, omissions, etc. can be made within the scope of the claims or the scope of their equivalents.

[0159] In addition, the above-mentioned embodiments may also be implemented by a device, a system, a method, a computer program, a computer-readable storage medium, and a combination thereof.

[0160] In addition, in this specification, the terms "first", "second", etc. are used for illustrative purposes only and should not be understood as indicating or implying the relative importance or order of technical features. Features defined as "first" and "second" indicate or imply that one or more of the features are included.

[0161] (Overview of Embodiments)

[0162] (1) The coil unit disclosed in the present invention comprises: a plurality of coils, which are arranged in a plurality of heating areas for heating a heating object when viewed from above; and one or more temperature sensors, which are arranged in the plurality of heating areas, the plurality of heating areas having a first heating area and a second heating area partially overlapping with the first heating area when viewed from above, and a non-heating area where no coils are arranged is provided around the plurality of heating areas when viewed from above, and the one or more temperature sensors include a first temperature sensor arranged in an overlapping area where the first heating area overlaps with the second heating area when viewed from above.

[0163] (2) In the coil unit described in (1), the first heating region and the second heating region may have a circular or polygonal shape in a plan view, and the plurality of coils may be radially arranged in the first heating region and the second heating region.

[0164] (3) In the coil unit described in (1) or (2), each of the plurality of coils has a fan-shaped, triangular, or polygonal outer shape in a plan view.

[0165] (4) In the coil unit described in any one of (1) to (3), the plurality of coils may include one or more overlapping coils arranged in the overlapping area, and the one or more overlapping coils may have a space on the inner side when viewed from above, and the first temperature sensor may be arranged in the space of the one or more overlapping coils when viewed from above.

[0166] (5) In the coil unit described in any one of (1) to (3), the plurality of coils include one or more overlapping coils disposed in the overlapping region, and the coils other than the one or more overlapping coils among the plurality of coils have the same outer diameter shape.

[0167] (6) In the coil unit according to any one of (1) to (4), the plurality of coils have the same outer diameter shape.

[0168] (7) In the coil unit described in any one of (1) to (6), the one or more temperature sensors may include a second temperature sensor arranged in the first heating area when viewed from above, and at least a portion of the second temperature sensor is arranged outside the overlapping area when viewed from above.

[0169] (8) In the coil unit described in any one of (1) to (3), the first temperature sensor may be a contact-type temperature sensor.

[0170] (9) In the coil unit described in (7), the second temperature sensor may be a non-contact temperature sensor.

[0171] (10) In the coil unit described in (7) or (9), the one or more temperature sensors include a third temperature sensor arranged in the second heating area when viewed from above, and the detection range of the second temperature sensor is different from the detection range of the third temperature sensor.

[0172] (11) In the coil unit described in any one of (1) to (3) and (5), the plurality of coils may include a plurality of overlapping coils arranged in the overlapping area, the plurality of overlapping coils may be arranged adjacent to each other with a gap therebetween, and the first temperature sensor may be arranged in the gap when viewed from above.

[0173] (12) In the coil unit described in (4), the first temperature sensor may be a contact-type temperature sensor.

[0174] (13) In the coil unit described in (7) or (10), the second temperature sensor may be a non-contact temperature sensor and may be arranged in a portion of the first heating region where the plurality of coils are not arranged when viewed from above.

[0175] (14) In the coil unit described in any one of (1) to (13), the one or more temperature sensors may include a non-contact temperature sensor, and may be surrounded by an insulating casing when viewed from above.

[0176] (15) In the coil unit described in any one of (1) to (14), the one or more temperature sensors may include a contact-type temperature sensor, and the plurality of coils may include a coil having a space inside when viewed from above, and when viewed from above, when an inscribed circle tangent to the inside of the coil is drawn in the space of the coil, the contact-type temperature sensor may be arranged at the center of the inscribed circle, and the diameter of the inscribed circle may satisfy the following formula:

[0177]

[0178] D10: Diameter of the inscribed circle (mm)

[0179] Vc: coil voltage (V)

[0180] Ac: Coil current (A)

[0181] Fc: frequency (Hz).

[0182] (16) In the coil unit described in any one of (1) to (7) and (9) to (13), the first temperature sensor may be a non-contact temperature sensor.

[0183] (17) In the coil unit described in any one of (1) to (16), the one or more temperature sensors may include a contact temperature sensor, and the contact temperature sensor may be arranged outside the plurality of coils when viewed from above. When viewed from above, the distance between the contact temperature sensor and the coil closest to the contact temperature sensor among the plurality of coils may satisfy the following equation:

[0184]

[0185] B1: Distance between coil and contact temperature sensor (mm)

[0186] Vc: coil voltage (V)

[0187] Ac: Coil current (A)

[0188] Fc: frequency (Hz).

[0189] (18) In the coil unit described in any one of (7), (9) to (10), and (13), the first heating area can have a circular shape when viewed from above, and the second temperature sensor can be arranged in the first heating area. When viewed from above, the distance between the first temperature sensor and the second temperature sensor can be greater than 1 / 4 times and less than 3 / 4 times the diameter of the first heating area.

[0190] (19) In the coil unit described in any one of (1) to (18), the non-heating region may be provided within a region defined by one or more indicators located around the plurality of heating regions in a plan view.

[0191] Possibility of industrial application

[0192] According to the present disclosure, it can be applied to an induction heating cooker that performs heating using a plurality of coils.

Claims

1. A coil unit, wherein: The coil unit comprises: a plurality of coils arranged in a plurality of heating regions for heating a heating object in a plan view; and one or more temperature sensors disposed at the plurality of heating zones, The plurality of heating regions include a first heating region and a second heating region partially overlapping the first heating region in a plan view. In a plan view, a non-heating area where no coils are arranged is provided around the plurality of heating areas. The one or more temperature sensors include a first temperature sensor disposed in an overlapping region where the first heating region overlaps the second heating region in a plan view.

2. The coil unit according to claim 1, wherein: The first heating area and the second heating area have a circular or polygonal shape when viewed from above. In the first heating area and the second heating area, the plurality of coils are radially arranged.

3. The coil unit according to claim 1, wherein: The plurality of coils each have a fan-shaped, triangular or polygonal shape in a plan view.

4. The coil unit according to claim 1, wherein: The plurality of coils include one or more overlapping coils arranged in the overlapping area, The one or more overlapping coils have a space inside when viewed from above, The first temperature sensor is disposed in the space between the one or more overlapping coils in a plan view.

5. The coil unit according to claim 1, wherein: The plurality of coils have one or more overlapping coils arranged in the overlapping area, The coils of the plurality of coils other than the one or more overlapping coils have the same outer diameter shape.

6. The coil unit according to claim 1, wherein: The plurality of coils have the same outer diameter shape.

7. The coil unit according to claim 1, wherein: The one or more temperature sensors include a second temperature sensor, the second temperature sensor being disposed in the first heating area when viewed from above, At least a portion of the second temperature sensor is disposed outside the overlapping region in a plan view.

8. The coil unit according to claim 1, wherein: The first temperature sensor is a contact temperature sensor.

9. The coil unit according to claim 7, wherein: The second temperature sensor is a non-contact temperature sensor.

10. The coil unit according to claim 7, wherein: The one or more temperature sensors include a third temperature sensor, the third temperature sensor being disposed in the second heating area when viewed from above, A detection range of the second temperature sensor is different from a detection range of the third temperature sensor.

11. The coil unit according to claim 1, wherein: The plurality of coils include a plurality of overlapping coils arranged in the overlapping area, The plurality of overlapping coils are arranged adjacent to each other with gaps therebetween. The first temperature sensor is disposed in the gap in a plan view.

12. The coil unit according to claim 4, wherein: The first temperature sensor is a contact temperature sensor.

13. The coil unit according to claim 7, wherein: The second temperature sensor is a non-contact temperature sensor, and is disposed in a portion of the first heating region where the plurality of coils are not disposed, in a plan view.

14. The coil unit according to claim 1, wherein: The one or more temperature sensors include a non-contact temperature sensor and are surrounded by an insulating housing when viewed from above.

15. The coil unit according to claim 1, wherein The one or more temperature sensors include contact temperature sensors, The plurality of coils include a coil having a space inside when viewed from above, When viewed from above, when the space of the coil describes an inscribed circle that is tangential to the inner side of the coil, the contact-type temperature sensor is arranged at the center of the inscribed circle. The diameter of the inscribed circle satisfies the following formula: D10: Diameter of the inscribed circle (mm) Vc: coil voltage (V) Ac: Coil current (A) Fc: frequency (Hz).

16. The coil unit according to claim 4, wherein: The first temperature sensor is a non-contact temperature sensor.

17. The coil unit according to claim 1, wherein: The one or more temperature sensors include contact temperature sensors, The contact-type temperature sensor is arranged outside the plurality of coils in a plan view. In a plan view, a distance between a coil of the plurality of coils closest to the contact-type temperature sensor and the contact-type temperature sensor satisfies the following formula: B1: Distance between coil and contact temperature sensor (mm) Vc: coil voltage (V) Ac: Coil current (A) Fc: frequency (Hz).

18. The coil unit according to claim 7, wherein: The first heating area has a circular shape when viewed from above, The second temperature sensor is disposed in the first heating area. In a plan view, a distance between the first temperature sensor and the second temperature sensor is not less than 1 / 4 times and not more than 3 / 4 times the diameter of the first heating region.

19. The coil unit according to claim 1, wherein: When viewed from above, the non-heating area is arranged within an area defined by one or more indications located around the plurality of heating areas.

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