Coil unit and induction heating cooker

Abstract

To efficiently heat an object to be heated.SOLUTION: A coil unit according to the present disclosure includes a plurality of coils arranged in a first heating area and a second heating area where an object to be heated is heated. The second heating area is provided around the first heating area, has a fan shape, and has a plurality of coil arrangement areas defined by a plurality of boundary lines extending radially from the center toward the outer periphery of the second heating area and an outer peripheral line defining the outer periphery of a circular arc portion of the second heating area. A coil arranged in the second heating area has a plurality of coil pieces arranged in the plurality of respective coil arrangement areas, and each of the plurality of coil pieces in the second heating area has a coil wire arranged along adjacent two boundary lines of the plurality of boundary liens defining the plurality of coil arrangement areas. The coil wires each have a first coil wire part arranged along the adjacent two boundary lines and the outer peripheral line and a second coil wire part arranged inside the first coil wire part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a coil unit and an induction heating cooker. [Background technology]

[0002] Patent Document 1 discloses an induction heating cooker equipped with a plurality of heating coils.

[0003] The induction heating cooker described in Patent Document 1 includes multiple heating coils, multiple power supply circuit units, a control circuit unit, and a direction switching means. The multiple heating coils are wound on a plane. The multiple power supply circuit units supply high-frequency currents to each heating coil. The control circuit unit controls the high-frequency currents that each power supply circuit unit supplies to each heating coil. The direction switching means switches between a heating mode in which high-frequency currents flow in the same direction and a heating mode in which high-frequency currents flow in opposite directions in adjacent regions of each heating coil. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-282782 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been a demand for induction heating cookers that can heat an object to be heated more efficiently.

[0006] Therefore, an object of the present disclosure is to solve the above-mentioned problems and to provide a coil unit and an induction heating cooker that can efficiently heat an object to be heated. [Means for solving the problem]

[0007] A coil unit according to an embodiment of the present disclosure includes: A plurality of coils are provided in a first heating region and a second heating region that heat an object to be heated in a plan view; The second heating region is In a plan view, the heating element is provided around the first heating region and has a sector shape; In a plan view, the second heating region has a plurality of coil arrangement regions defined by a plurality of boundary lines extending radially from a center of the second heating region toward an outer periphery and an outer periphery line defining an outer periphery of an arc portion of the second heating region; the coil arranged in the second heating region has a plurality of coil pieces arranged in the plurality of coil arrangement regions, respectively, in a plan view; Each of the coil pieces in the second heating region has a coil wire that is arranged along two adjacent boundary lines among the boundary lines that define the coil arrangement regions in a plan view, The coil wire is a first coil wire portion disposed along the two adjacent boundary lines and the outer circumferential line in a plan view; a second coil wire portion disposed inside the first coil wire portion in a plan view; has.

[0008] An induction heating cooker according to one aspect of the present disclosure includes one or more coil units according to the above aspect. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a coil unit and an induction heating cooker that can efficiently heat an object to be heated. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic perspective view of an example of an induction heating cooker according to a first embodiment of the present disclosure. [Diagram 2] 1 is a plan view of an example of a coil unit according to a first embodiment of the present disclosure. [Diagram 3] 3 is a schematic enlarged view of a coil piece constituting the coil unit of FIG. 2. [Figure 4] FIG. 13 is a plan view of a coil unit according to a first modified example. [Diagram 5] FIG. 11 is a plan view of a coil unit according to a second modified example. [Figure 6] FIG. 13 is a plan view of a coil unit according to a third modified example. [Figure 7] 11 is a plan view of an example of a coil unit according to a second embodiment of the present disclosure. FIG. [Figure 8] FIG. 13 is a plan view of a coil unit according to a fourth modified example. [Figure 9] FIG. 11 is a schematic diagram of an example of an induction heating cooker according to a third embodiment of the present disclosure. [Figure 10] 10 is a schematic enlarged view of a coil unit arranged in a third region of FIG. 9. FIG. [Figure 11] FIG. 13 is a schematic diagram of an induction heating cooker according to a fifth modified example. [Figure 12] 12 is a schematic enlarged view of the coil units arranged in the third and fourth regions of FIG. 11. FIG. [Figure 13] FIG. 13 is a schematic enlarged view of a coil piece according to a sixth modified example. [Figure 14] FIG. 23 is a schematic enlarged view of a coil piece according to a seventh modified example. [Figure 15] FIG. 13 is a schematic enlarged view of a coil piece according to an eighth modified example. [Figure 16] FIG. 13 is a schematic enlarged view of a coil piece according to a ninth modified example. [Figure 17] FIG. 23 is a plan view of a first coil of a tenth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A coil unit of a first aspect of the present disclosure comprises, in a planar view, a plurality of coils arranged in a first heating area and a second heating area that heat an object to be heated, the second heating area being arranged around the first heating area in a planar view, having a fan shape, and having a plurality of coil arrangement areas defined in a planar view by a plurality of boundary lines extending radially from the center of the second heating area toward the outer periphery and an outer periphery line that defines the outer periphery of an arc portion of the second heating area, the coil arranged in the second heating area having a plurality of coil pieces respectively arranged in the plurality of coil arrangement areas in a planar view, and each of the plurality of coil pieces in the second heating area has a coil wire arranged along two adjacent boundary lines among the plurality of boundary lines that define the plurality of coil arrangement areas in a planar view.

[0012] In the coil unit of the second aspect of the present disclosure, the multiple boundary lines of the second heating area may be straight lines, and the coil wire of the second heating area may be arranged, in a planar view, along two adjacent boundary lines and the outer circumferential line connecting the two boundary lines.

[0013] In the coil unit of the third aspect of the present disclosure, the multiple coil arrangement areas of the second heating area may have approximately the same shape in a planar view, and the multiple coil pieces of the second heating area may have approximately the same shape in a planar view.

[0014] In a coil unit of a fourth aspect of the present disclosure, the first heating area has a plurality of coil arrangement areas defined by a plurality of boundary lines extending radially from the center of the first heating area toward the outer periphery in a planar view and an outer periphery line defining the outer periphery of the first heating area, and the coil arranged in the first heating area has a plurality of coil pieces respectively arranged in the plurality of coil arrangement areas, and each of the plurality of coil pieces of the first heating area may have a coil wire arranged along two adjacent boundary lines among the plurality of boundary lines defining the plurality of coil arrangement areas in a planar view.

[0015] In the coil unit of the fifth aspect of the present disclosure, the multiple boundary lines of the first heating area may be straight lines, and the coil wire of the first heating area may be arranged, in a planar view, along two adjacent boundary lines and the outer circumferential line connecting the two boundary lines.

[0016] In the coil unit of a sixth aspect of the present disclosure, the multiple coil arrangement areas of the first heating area may have approximately the same shape in a planar view, and the multiple coil pieces of the first heating area may have approximately the same shape in a planar view.

[0017] In the coil unit according to the seventh aspect of the present disclosure, the coil pieces in the first heating region may have substantially the same shape as the coil pieces in the second heating region.

[0018] In the coil unit according to the eighth aspect of the present disclosure, the first heating region may have a circular shape in a plan view.

[0019] In the coil unit of the 9th aspect of the present disclosure, in a planar view, the multiple coil pieces arranged in the first heating area and the multiple coil pieces arranged in the second heating area may be arranged symmetrically with respect to a line passing through the center of the first heating area and the center of the second heating area.

[0020] In the coil unit of a tenth aspect of the present disclosure, a third heating area having a sector shape is provided around the second heating area in the direction in which the first heating area and the second heating area are aligned, and the third heating area has a plurality of coil arrangement areas defined in a planar view by a plurality of boundary lines extending radially from the center of the third heating area toward the outer periphery and an outer periphery line defining the outer periphery of an arc portion of the third heating area, and the coil arranged in the third heating area has a plurality of coil pieces respectively arranged in the plurality of coil arrangement areas in a planar view, and each of the plurality of coil pieces of the third heating area may have a coil wire arranged along two adjacent boundary lines among the plurality of boundary lines defining the plurality of coil arrangement areas in a planar view.

[0021] In the coil unit of the eleventh aspect of the present disclosure, the multiple coil arrangement areas of the third heating area may have approximately the same shape in a planar view, and the multiple coil pieces of the third heating area may have approximately the same shape in a planar view.

[0022] In the coil unit of the twelfth aspect of the present disclosure, the multiple coil arrangement areas of the third heating area may have approximately the same shape in a planar view, and the multiple coil pieces of the third heating area may have approximately the same shape in a planar view.

[0023] In the coil unit of the thirteenth aspect of the present disclosure, the coil pieces in the third heating region may have substantially the same shape as the coil pieces in the second heating region.

[0024] In the coil unit of the fourteenth aspect of the present disclosure, in a planar view, the multiple coil pieces arranged in the second heating area and the multiple coil pieces arranged in the third heating area may be arranged symmetrically with respect to a line passing through the center of the second heating area and the center of the third heating area.

[0025] An induction heating cooker according to a fifteenth aspect of the present disclosure includes one or more coil units according to any one of the first to fourteenth aspects.

[0026] In a sixteenth aspect of the induction heating cooker of the present disclosure, the multiple coil units are arranged at intervals in a planar view and include multiple first coil units arranged in a first area and a second area that heat an object to be heated, and the induction heating cooker further includes a second coil unit arranged in a third area provided between the first area and the second area in a planar view, and the second coil unit includes one or more coil pieces, and the one or more coil pieces may have approximately the same shape as the multiple coil pieces in the second heating area.

[0027] In the induction heating cooker of the seventeenth aspect of the present disclosure, the third region may have a triangular shape in a planar view, and each of the plurality of coil pieces in the third region may have a coil wire arranged along two adjacent lines out of three lines that define the third region in a planar view.

[0028] In the induction heating cooker of the eighteenth aspect of the present disclosure, in a plan view, an apex of a triangle of the third region may be located between the first region and the second region.

[0029] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. Note that the following description is merely illustrative in nature and is not intended to limit the present disclosure, its application, or its uses. Furthermore, the drawings are schematic, and the ratios of dimensions, etc. do not necessarily correspond to the real ones.

[0030] (Embodiment 1) [Overall configuration] 1 is a schematic perspective view of an example of an induction heating cooker 100 according to a first embodiment of the present disclosure. Note that the XYZ coordinate system shown in the figure is for aiding understanding of the invention and does not limit the invention. The X-axis direction indicates the left-right direction, the Y-axis direction indicates the depth direction, and the Z-axis direction indicates the vertical direction.

[0031] As shown in Fig. 1, the induction heating cooker 100 is a cooker that induction heats a cooking container C that contains an object to be cooked T. In this specification, the cooking container C is described as an example of an object to be heated. The object to be heated is not limited to the cooking container C, and may be any object that can be induction heated.

[0032] The induction heating cooker 100 has a top plate 3 made of, for example, heat-resistant glass on which a cooking container C is placed, and a housing 4 attached to the lower surface of the top plate 3. A plurality of coil units 1, 2 are mounted inside the housing 4. Each of the plurality of coil units 1, 2 is disposed below the top plate 3, and induction heats the cooking container C placed on the opposing portion of the top plate 3. That is, each of the plurality of coil units 1, 2 functions as an induction heating coil unit.

[0033] The coil unit 1 will be described later. The coil unit 2 is a coil unit different from the coil unit 1, and may be composed of one coil or may be composed of multiple coils.

[0034] The induction heating cooker 100 includes a control unit that controls the coil units 1 and 2. The control unit includes, for example, a memory that stores a program, and a processing circuit that corresponds to a processor such as a CPU (Central Processing Unit). In the control unit, the processor executes the program stored in the memory.

[0035] [Coil unit] The coil unit 1 will be described below with reference to FIGS.

[0036] Fig. 2 is a plan view of an example of the coil unit 1 of the first embodiment according to the present disclosure. As shown in Fig. 2, the coil unit 1 includes a plurality of coils 5A and 5B. In a plan view, the plurality of coils 5A and 5B are arranged in a first heating region S10 and a second heating region S20 that heat an object to be heated. In this specification, the coil 5A arranged in the first heating region S10 is referred to as the first coil 5A, and the coil 5B arranged in the second heating region S20 is referred to as the second coil 5B. In addition, in this specification, "plan view" means a view from the vertical direction, i.e., the Z-axis direction.

[0037] The first heating area S10 is an area having a center C1 in a plan view, and is an area where the first coil 5A is arranged. In the present embodiment, the first heating area S10 has a circular shape in a plan view. The first heating area S10 may be an area in which a cooking container C shown on the upper surface of the top plate 3 is arranged in a plan view. Alternatively, the first heating area S10 may be an area smaller than an area in which a cooking container C shown on the upper surface of the top plate 3 can be arranged in a plan view.

[0038] The first heating region S10 has a plurality of first coil arrangement regions S11-S16. The plurality of first coil arrangement regions S11-S16 are arranged radially and adjacently around the center C1 of the first heating region S10 in a plan view. Specifically, the plurality of first coil arrangement regions S11-S16 are defined by a plurality of first boundary lines L11-L16 extending radially from the center C1 of the first heating region S10 toward the outer periphery in a plan view, and a first outer periphery line L10 that defines the outer periphery of the first heating region S10.

[0039] The first boundary lines L11-L16 are arranged at equal intervals radially from the center C1 of the first heating region S10 in a plan view. The first boundary lines L11-L16 are straight lines extending from the center C1 of the first heating region S10 toward the outer periphery in a plan view. The angles between two adjacent first boundary lines L11-L16 are substantially the same. As a result, the first coil arrangement regions S11-S16 have substantially the same shape and substantially the same dimensions in a plan view. In this specification, "substantially" means within an error of 10%, and preferably within an error of 5%.

[0040] Each of the first coil arrangement regions S11 to S16 has a sector shape in plan view. In this specification, the term "sector shape" refers to a shape defined by two straight lines (radii) extending from the center of a circle to the outer periphery in plan view and an arc connecting the two straight lines.

[0041] In this embodiment, the multiple first boundary lines include six first boundary lines L11 to L16, and the angle between two adjacent first boundary lines is 60 degrees. This divides the first heating region S10 into six first coil arrangement regions S11 to S16 that have approximately the same shape and approximately the same dimensions in a plan view.

[0042] The second heating region S20 is a region provided around the first heating region S10 in a plan view, and is a region where the second coil 5B is arranged. The second heating region S20 is provided on the back side of the first heating region S10 in the depth direction (Y-axis direction). The second heating region S20 has a fan shape having a center C2 in a plan view. In the second heating region S20, the central angle formed by two straight lines extending from the center C2 of the circle toward the outer periphery is, for example, 180° or more and 300° or less. In this embodiment, the central angle is 240°. In the second heating region S20, the two straight lines extending from the center C2 of the circle toward the outer periphery correspond to the second boundary lines L21 and L25. In a plan view, the second outer periphery line L20 of the arc is not provided between the second boundary lines L21 and L25. Therefore, in a plan view, the second heating region S20 is not provided between the second boundary lines L21 and L25.

[0043] The second heating region S20 is provided so as to surround a part of the first heating region S10 in a plan view. Specifically, the second heating region S20 is arranged around the first heating region S10 so that the two second boundary lines L21, L25 defining the second heating region S20 are arranged around the first outer perimeter line L10 of the first heating region S10 in a plan view. In other words, the first heating region S10 is arranged in a portion between the second boundary lines L21, L25 defining the outer perimeter of the second heating region S20 and where the second heating region S20 is not provided in a plan view.

[0044] The second heating region S20 has a plurality of second coil arrangement regions S21-S24. The plurality of second coil arrangement regions S21-S24 are arranged radially and adjacently around the center C2 of the second heating region S20 in a plan view. Specifically, the plurality of second coil arrangement regions S21-S24 are defined by a plurality of second boundary lines L21-L25 extending radially from the center C2 of the second heating region S20 toward the outer periphery in a plan view, and a second outer periphery line L20 that defines the outer periphery of the arc portion of the second heating region S20.

[0045] The second boundary lines L21 to L25 are arranged radially at equal intervals around the center C2 of the second heating region S20 in a plan view. The second boundary lines L21 to L25 are straight lines extending from the center C2 of the second heating region S20 toward the outer periphery in a plan view. The angles formed by two adjacent second boundary lines among the second boundary lines L21 to L25 are substantially the same. As a result, the second coil arrangement regions S21 to S24 have substantially the same shape and dimensions in a plan view.

[0046] In this embodiment, the multiple second boundary lines include five second boundary lines L21 to L25, and the angle between two adjacent second boundary lines is 60 degrees. This divides the second heating region S20 into four second coil arrangement regions S21 to S24 that have approximately the same shape and approximately the same dimensions in a plan view.

[0047] The first coil 5A arranged in the first heating region S10 includes a plurality of first coil pieces 10A. The plurality of first coil pieces 10A are arranged in a plurality of first coil arrangement regions S11 to S16, respectively, in a plan view. Specifically, in the first heating region S10, one first coil piece 10A is arranged in one first coil arrangement region. As a result, the plurality of first coil pieces 10A are arranged radially and adjacently in the first heating region S10 in a plan view. In this embodiment, the first coil 5A has six first coil pieces 10A.

[0048] Next, the detailed configuration of the first coil piece 10A will be described with reference to FIG.

[0049] Fig. 3 is a schematic enlarged view of the first coil piece 10A. Fig. 3 shows the first coil piece 10A arranged in the first coil arrangement region S11. Note that the first coil pieces 10A arranged in the first coil arrangement regions S12 to S16 have the same configuration as the first coil piece 10A arranged in the first coil arrangement region S11, so a description thereof will be omitted.

[0050] As shown in FIG. 3, the first coil piece 10A has a first coil wire 11A that is wound and arranged in the first coil arrangement region S11.

[0051] The first coil wire 11A is arranged, in a plan view, along two adjacent first boundary lines L11, L12 among the multiple first boundary lines L11 to L16. Specifically, in a plan view, the first coil wire 11A is arranged, in the first coil arrangement region S11, along the two adjacent first boundary lines L11, L12 and a first outer circumferential line L10 connecting the two adjacent first boundary lines L11, L12, and is arranged by being wound inward.

[0052] The first coil wire 11A is arranged in a frame shape in a plan view. In this embodiment, since the first coil arrangement region S11 is formed in a sector shape in a plan view, the outer shape of the first coil wire 11A is also formed in a sector shape in a plan view.

[0053] The first coil wire 11A is made of, for example, a conductive material.

[0054] The first coil wire 11A has a first coil wire section 20, a second coil wire section 30, and a third coil wire section 40. The first coil wire section 20, the second coil wire section 30, and the third coil wire section 40 are integrally configured. The first coil wire section 20, the second coil wire section 30, and the third coil wire section 40 have approximately the same wire diameter. Each of the first coil wire section 20, the second coil wire section 30, and the third coil wire section 40 is configured by winding a bundle of multiple metal wires that are twisted and bundled together for multiple turns. For example, the first coil wire section 20, the second coil wire section 30, and the third coil wire section 40 is configured by winding about 10 turns of about 20 copper wires with a diameter of 0.2 mm that are twisted and bundled together. The diameter of the metal wire is not limited to 0.2 mm and may be set as appropriate. For example, the diameter of the metal wire may be appropriately selected within a range of 0.01 mm to 0.5 mm. Furthermore, the material of the metal wire is not limited to copper, and may be, for example, aluminum or a copper-aluminum clad material. Furthermore, the number of metal wires bundled together (i.e., the so-called number of cores) is not limited to 20, and may be selected as appropriate. For example, the number of cores may be selected as appropriate within a range of 5 to 50. Furthermore, the number of windings is not limited to 10 turns, and may be set as appropriate. For example, the number of windings may be selected as appropriate within a range of 5 to 20 turns.

[0055] The first coil wire portion 20 is disposed along two adjacent first boundary lines L11, L12 and the first outer circumferential line L10 in a plan view. The first coil wire portion 20 is a portion of the first coil wire 11A that is disposed on the outermost side of the first coil piece 10A in a plan view. The first coil wire portion 20 is formed in a frame shape in a plan view. The outer shape of the first coil wire portion 20 is formed in a sector shape in a plan view.

[0056] Specifically, the first coil wire portion 20 has straight portions 21 and 22, a curved portion 23, and connection portions 24, 25, and 26. The straight portion 21 is a straight coil portion arranged along the first boundary line L11. The straight portion 22 is a straight coil portion arranged along the first boundary line L12. The curved portion 23 is a curved coil portion arranged along the first outer circumferential line L10. The connection portion 24 is a coil portion that connects one end of the straight portion 21 and one end of the straight portion 22 near the center C1 of the first heating region S10 in a plan view. The connection portion 24 is arranged at a corner portion where two adjacent first boundary lines L11 and L12 intersect in a plan view. The connection portion 25 is a coil portion that connects the other end of the straight portion 21 and one end of the curved portion 23 near the first outer circumferential line L10 of the first heating region S10 in a plan view. The connection portion 25 is disposed at a corner portion where two adjacent first boundary lines L11 and the first outer circumferential line L10 intersect in a plan view. The connection portion 26 is a coil portion that connects the other end of the straight portion 22 and the other end of the curved portion 23 on the first outer circumferential line L10 side of the first heating region S10 in a plan view. The connection portion 26 is disposed at a corner portion where two adjacent first boundary lines L12 and the first outer circumferential line L10 intersect in a plan view. The connection portions 24, 25, and 26 have, for example, a U-shaped curved shape.

[0057] In this specification, unless otherwise specified, "disposed along the first boundary line L11 or L12" means that there is no other component arranged to block the space between the first boundary line L11 or L12 and the first coil wire 11A, and the first coil wire 11A is arranged to extend in substantially the same direction as the first boundary line L11 or L12. The same applies to "disposed along the first circumferential line L10".

[0058] The second coil wire portion 30 is disposed along the inside of the first coil wire portion 20 in a plan view. The second coil wire portion 30 is formed in a frame shape along the inside of the first coil wire portion 20 in a plan view. The outer shape of the second coil wire portion 30 is formed in a sector shape in a plan view.

[0059] Specifically, the second coil wire portion 30 has straight portions 31 and 32, a curved portion 33, and connection portions 34, 35, and 36. The straight portion 31 is a straight coil portion arranged along the straight portion 21 of the first coil wire portion 20. The straight portion 32 is a straight coil portion arranged along the straight portion 22 of the first coil wire portion 20. The curved portion 33 is a curved coil portion arranged along the curved portion 23 of the first coil wire portion 20. The connection portion 34 is a coil portion that connects one end of the straight portion 31 and one end of the straight portion 32 near the center C1 of the first heating region S10 in a plan view. The connection portion 35 is a coil portion that connects the other end of the straight portion 31 and one end of the curved portion 33 near the first circumferential line L10 of the first heating region S10 in a plan view. The connecting portion 36 is a coil portion that connects the other end of the straight portion 32 and the other end of the curved portion 33 near the first circumferential line L10 of the first heating region S10 in a plan view. The connecting portions 34, 35, and 36 each have a curved shape, for example, in a U-shape.

[0060] The third coil wire portion 40 is disposed along the inside of the second coil wire portion 30 in a plan view. The third coil wire portion 40 is formed in a frame shape along the inside of the second coil wire portion 30 in a plan view. The outer shape of the third coil wire portion 40 is formed in a sector shape in a plan view.

[0061] Specifically, the third coil wire portion 40 has straight portions 41, 42, a curved portion 43, and connection portions 44, 45, 46. The straight portion 41 is a straight coil portion arranged along the straight portion 31 of the second coil wire portion 30. The straight portion 42 is a straight coil portion arranged along the straight portion 32 of the second coil wire portion 30. The curved portion 43 is a curved coil portion arranged along the curved portion 33 of the second coil wire portion 30. The connection portion 44 is a coil portion that connects one end of the straight portion 41 and one end of the straight portion 42 near the center C1 of the first heating region S10 in a plan view. The connection portion 45 is a coil portion that connects the other end of the straight portion 41 and one end of the curved portion 43 near the first circumferential line L10 of the first heating region S10 in a plan view. The connecting portion 46 is a coil portion that connects the other end of the straight portion 42 and the other end of the curved portion 43 near the first circumferential line L10 of the first heating region S10 in a plan view. The connecting portions 44, 45, and 46 each have a curved shape, for example, in a U-shape.

[0062] In this embodiment, the straight portions 21, 31, and 41 are disposed substantially parallel to one another. The straight portions 22, 32, and 42 are disposed substantially parallel to one another. The curved portions 23, 33, and 43 are disposed opposite to one another.

[0063] Thus, the first coil 5A disposed in the first heating region S10 has a plurality of first coil pieces 10A disposed in the plurality of first coil arrangement regions S11-S16, respectively. Each of the plurality of first coil pieces 10A has a first coil wire 11A disposed along a plurality of first boundary lines L11-L16 and a first outer circumferential line L10 that define the plurality of first coil arrangement regions S11-S16 in a plan view.

[0064] The second coil 5B arranged in the second heating region S20 has a plurality of second coil pieces 10B. The plurality of second coil pieces 10B are arranged in a plurality of second coil arrangement regions S21 to S24, respectively, in a plan view. Specifically, in the second heating region S20, one second coil piece 10B is arranged in one second coil arrangement region. As a result, the plurality of second coil pieces 10B are arranged radially and adjacently in the second heating region S20 in a plan view. In this embodiment, the second coil 5B has four second coil pieces 10B.

[0065] The second coil piece 10B is substantially the same as the above-described first coil piece 10A.

[0066] Each of the multiple second coil pieces 10B has a second coil wire 11B that is wound and arranged in each of the multiple second coil arrangement regions S21 to S24.

[0067] The second coil wire 11B is arranged along two adjacent second boundary lines among the multiple second boundary lines L21 to L25 in a plan view. Specifically, the second coil wire 11B is arranged along the two adjacent second boundary lines and the second outer circumferential line L20 that connects the two adjacent second boundary lines in a plan view, and is arranged by being wound inward.

[0068] In this embodiment, the second coil pieces 10B have substantially the same shape and dimensions in a plan view. The second coil pieces 10B also have substantially the same shape and dimensions as the first coil pieces 10A. That is, each of the second coil pieces 10B has a sector shape in a plan view.

[0069] 2, the multiple first coil pieces 10A arranged in the first heating region S10 and the multiple second coil pieces 10B arranged in the second heating region S20 are arranged symmetrically in a plan view. Specifically, the multiple first coil pieces 10A and the multiple second coil pieces 10B are arranged symmetrically with respect to a line CL1 passing through a center C1 of the first heating region S10 and a center C2 of the second heating region 20.

[0070] Also, in plan view, some of the first coil pieces 10A arranged in the first heating region S10 are arranged so as to straddle the line CL1. On the other hand, in plan view, the second coil pieces 10B arranged in the second heating region S20 are arranged so as not to straddle the line CL1. In the example shown in FIG. 2, two first coil pieces 10A arranged in the first coil arrangement regions S11, S14 of the first heating region S10 are arranged so as to straddle the line CL1. On the other hand, in plan view, the line CL1 is located between two second coil pieces 10B arranged in the two second coil arrangement regions S22, S23 of the second heating region S20. The line CL1 extends along the second boundary line L23, while extending in a direction intersecting the first boundary lines L11 to L16.

[0071] [effect] The coil unit 1 according to the first embodiment can provide the following effects.

[0072] The coil unit 1 according to the first embodiment of the present disclosure includes, in a plan view, a plurality of coils 5A, 5B arranged in a first heating region S10 and a second heating region S20 for heating an object to be heated. In a plan view, the second heating region S20 is provided around the first heating region S10 and has a sector shape. In addition, in a plan view, the second heating region S20 has a plurality of second coil arrangement regions S21-S24 defined by a plurality of second boundary lines L21-L25 extending radially from a center C2 of the second heating region S20 toward the outer periphery and a second outer periphery line L20 that defines the outer periphery of the arc portion of the second heating region S20. The coil 5B arranged in the second heating region S20 has a plurality of second coil pieces 10B arranged in each of the plurality of second coil arrangement regions S21-S24 in a plan view. Each of the multiple second coil pieces 10B has a second coil wire 11B that is arranged along two adjacent second boundary lines among the multiple second boundary lines L21-L25 that define the multiple second coil arrangement regions S21-S24 in a plan view.

[0073] With this configuration, the object to be heated can be heated efficiently. According to the coil unit 1, the object to be heated can be heated not only in the first heating region S10 but also in the second heating region S20. For example, the object to be heated that is disposed across the first heating region S10 and the second heating region S20 can be heated, so that the region that is difficult to heat can be reduced. This can reduce uneven heating and efficiently heat the object to be heated.

[0074] Moreover, the second heating region S20 is divided into a plurality of second coil arrangement regions S21-S24 by a plurality of second boundary lines L21-L25 and the second outer circumferential line L20 in a plan view. In each of the plurality of second coil arrangement regions S21-S24, the second coil wire 11B constituting the second coil piece 10B is arranged along two adjacent second boundary lines. This makes it possible to reduce the gap between the plurality of second coil pieces 10B and to reduce the variation in the gap. As a result, it is possible to reduce the region between the plurality of second coil pieces 10B that is difficult to heat. In addition, since the gap between the plurality of second coil pieces 10B can be reduced, it is possible to improve the heating efficiency of the coil unit 1 and realize a compact size.

[0075] Moreover, the heating of the multiple second coil pieces 10B can be individually controlled by the control unit. For example, in a plan view, two second coil pieces 10B arranged in the center of the second heating region S20 or two second coil pieces 10B arranged outside the center of the second heating region S20 can be used for heating to concentrate heating of any location of the heating object. Alternatively, all the second coil pieces 10B arranged in the second heating region S20 can be used for heating to heat the heating object evenly.

[0076] The second boundary lines L21-L25 are straight lines. The second coil wire 11B is arranged along two adjacent second boundary lines and a second outer circumferential line L20 that connects the two second boundary lines in a plan view. This configuration can increase the area of ​​the second coil pieces 10B arranged in each of the second coil arrangement areas S21-S24 of the second heating area S20 in a plan view. This can increase the area heated by the second coil pieces 10B in the second heating area S20.

[0077] The second coil arrangement regions S21-S24 have substantially the same shape in a plan view, and the second coil pieces 10B have substantially the same shape in a plan view. With this configuration, the second coil pieces 10B can be evenly arranged in the second heating region S20 in a plan view. Also, the intervals between the second coil pieces 10B can be made smaller, further reducing uneven heating and enabling more efficient heating. Also, the coil unit 1 can be manufactured more easily and at a reduced manufacturing cost.

[0078] The first heating region S10 has a plurality of first coil arrangement regions S11-S16 defined by a plurality of first boundary lines L11-L16 extending radially from the center C1 of the first heating region S10 toward the outer periphery in a plan view and a first outer periphery line L10 that defines the outer periphery of the first heating region. The coil 5A disposed in the first heating region S10 has a plurality of first coil pieces 10A that are disposed in the plurality of first coil arrangement regions S11-S16, respectively. Each of the plurality of first coil pieces 10A has a first coil wire 11A that is disposed along two adjacent first boundary lines among the plurality of first boundary lines L11-L16 that define the plurality of first coil arrangement regions S11-S16 in a plan view. With this configuration, the object to be heated can be heated more efficiently. Specifically, uneven heating can be reduced even in the first heating region S10.

[0079] Also, similar to the multiple second coil pieces 10B, the gaps between the multiple first coil pieces 10A can be made small and the variation in the gaps can be reduced. As a result, the areas between the multiple first coil pieces 10A that are difficult to heat can be reduced. Also, because the gaps between the multiple first coil pieces 10A can be made small, the heating efficiency of the coil unit 1 can be improved.

[0080] Similarly to the second coil pieces 10B, the heating of the first coil pieces 10A can be individually controlled by the control unit. For example, in the first heating region S10, any location of the object to be heated can be concentratedly heated, or the entire object to be heated can be heated evenly.

[0081] The first boundary lines L11-L16 are straight lines, and the first coil wire 11A is arranged along two adjacent first boundary lines and a first outer circumferential line L10 that connects the two first boundary lines in a plan view. This configuration makes it possible to increase the area of ​​the first coil pieces 10A arranged in each of the first coil arrangement areas S11-S16 of the first heating area S10 in a plan view. This makes it possible to increase the area heated by the first coil pieces 10A in the first heating area S10.

[0082] The first coil arrangement regions S11-S16 have substantially the same shape in a plan view, and the first coil pieces 10A have substantially the same shape in a plan view. With this configuration, the first coil pieces 10A can be evenly arranged in the first heating region S10 in a plan view. Also, the spacing between the first coil pieces 10A can be made smaller, further reducing uneven heating and enabling more efficient heating. Also, the coil unit 1 can be manufactured more easily and at a reduced manufacturing cost.

[0083] The multiple first coil pieces 10A have substantially the same shape as the multiple second coil pieces 10B. With this configuration, the coil unit 1 can be manufactured more easily and at a lower cost.

[0084] The first heating region S10 has a circular shape in a plan view. With this configuration, the object to be heated can be heated more efficiently.

[0085] In a plan view, the multiple first coil pieces 10A arranged in the first heating region S10 and the multiple second coil pieces 10B arranged in the second heating region S20 are arranged symmetrically with respect to a line CL1 passing through the center C1 of the first heating region S10 and the center C2 of the second heating region S20. With this configuration, the object to be heated can be heated more efficiently.

[0086] The induction heating cooker 100 according to the first embodiment of the present disclosure includes the above-described coil unit 1. With such a configuration, the induction heating cooker 100 can achieve the same effects as those of the coil unit 1 described above.

[0087] In the present embodiment, an example in which the first coil 5A arranged in the first heating region S10 is composed of a plurality of coil pieces 10A has been described, but the present invention is not limited to this. The first coil 5A may be composed of one or a plurality of coils arranged in the first heating region S10 in a plan view. For example, the first coil 5A may be composed of one annular coil arranged along the first outer circumferential line L10 of the first heating region S10 in a plan view. Alternatively, the first coil 5A may be composed of a plurality of circular or elliptical coils arranged in the first heating region S10 in a plan view.

[0088] In the present embodiment, an example in which the first heating region S10 is circular in plan view has been described, but the present invention is not limited thereto. For example, the first heating region S10 may be rectangular, elliptical, or regular polygonal in plan view. When the first heating region S10 is rectangular in plan view, the center C1 of the first heating region S10 is the intersection of the diagonals. When the first heating region S10 is elliptical in plan view, the center C1 of the first heating region S10 is the intersection of the major axis and the minor axis. When the first heating region S10 is regular polygonal in plan view, the center C1 of the first heating region S10 is the center of an inscribed circle that is in contact with all the peripheries constituting the regular polygon.

[0089] In the present embodiment, the second heating region S20 has a sector shape in plan view, but is not limited thereto. For example, the second heating region S20 may have a polygonal shape or a partially cut-out elliptical shape in plan view.

[0090] In the present embodiment, the second heating region S20 is provided on the rear side of the first heating region S10 in the depth direction (Y-axis direction), but is not limited thereto. For example, the second heating region S20 may be provided on the front side of the first heating region S10 in the depth direction (Y-axis direction). Alternatively, the second heating region S20 may be provided on the side of the first heating region S10 in the left-right direction (X-direction).

[0091] In the present embodiment, an example in which the number of the first coil arrangement regions S11 to S16 is six has been described, but the present invention is not limited to this. Also, an example in which the number of the first coil pieces 10A is six has been described, but the present invention is not limited to this. For example, the number of the first coil arrangement regions may be three or more and eight or less. The number of the first coil pieces 10A may be three or more and eight or less. With such a configuration, it is possible to improve the heating efficiency and reduce the manufacturing cost.

[0092] In the present embodiment, an example in which the number of the second coil arrangement regions S21-S24 is four has been described, but the present invention is not limited to this. Also, an example in which the number of the second coil pieces 10B is four has been described, but the present invention is not limited to this. For example, the number of the second coil arrangement regions may be two or more and six or less. The number of the second coil pieces 10B may be two or more and six or less. With such a configuration, it is possible to improve the heating efficiency and reduce the manufacturing cost.

[0093] In the present embodiment, the first coil arrangement regions S11 to S16 have substantially the same shape and the same dimensions, but the present invention is not limited to this. For example, the first coil arrangement regions S11 to S16 may have different shapes and / or different dimensions.

[0094] In the present embodiment, the second coil arrangement regions S21 to S24 have substantially the same shape and the same dimensions, but are not limited thereto. For example, the second coil arrangement regions S21 to S24 may have different shapes and / or different dimensions.

[0095] In the present embodiment, an example has been described in which the first coil piece 10A has substantially the same shape and dimensions as the second coil piece 10B, but this is not limiting. For example, the first coil piece 10A may have a different shape and / or different dimensions from the second coil piece 10B.

[0096] In this embodiment, the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 have the same thickness, but at least one of them may be different from the others. The thicker the coil wire portion, the more the number of turns can be increased, and the greater the heating energy can be. Therefore, in areas where it is necessary to increase the thermal efficiency, the overall heating efficiency of the first heating area S10 and the second heating area S20 can be increased by increasing the thickness of the coil wire portion. Note that the heating energy can be increased by increasing the width of the coil wire portion, but if the width of the coil wire portion is increased, it may be difficult to bend the coil wire portion sharply along the shape of the first coil arrangement area and the second coil arrangement area. Therefore, it is easier to manufacture the coil wire portion by increasing the thickness rather than the width.

[0097] In the present embodiment, the first boundary lines L11 to L16 are straight lines extending from the center C1 of the first heating region S10 toward the outer periphery in a plan view, but are not limited thereto. For example, the first boundary lines L11 to L16 may be curved lines extending from the center C1 of the first heating region S10 toward the outer periphery in a plan view.

[0098] In the present embodiment, the second boundary lines L21 to L25 are straight lines extending from the center C2 of the second heating region S20 toward the outer periphery in a plan view, but are not limited thereto. For example, the second boundary lines L21 to L25 may be curved lines extending from the center C2 of the second heating region S20 toward the outer periphery in a plan view.

[0099] In the present embodiment, an example has been described in which the first coil wire 11A and the second coil wire 11B have the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40, but the present invention is not limited to this. For example, the first coil wire 11A and the second coil wire 11B may be composed of the first coil wire portion 20 without including the second coil wire portion 30 and the third coil wire portion 40. Alternatively, the first coil wire 11A and the second coil wire 11B may be composed of the first coil wire portion 20 and the second coil wire portion 30 without including the third coil wire portion 40.

[0100] In the present embodiment, an example has been described in which the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 are integrally formed, but the present invention is not limited to this. For example, the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 may be formed of separate members.

[0101] In the present embodiment, an example has been described in which the first coil pieces 10A and the second coil pieces 10B are arranged symmetrically with respect to a line CL1 passing through the center C1 of the first heating region S10 and the center C2 of the second heating region S20 in a plan view, but the present invention is not limited to this. For example, the first coil pieces 10A and the second coil pieces 10B do not have to be arranged symmetrically with respect to CL1 in a plan view.

[0102] In the present embodiment, an example has been described in which the multiple first coil pieces 10A arranged in the first heating region S10 are arranged to straddle the line CL1 in a plan view, but the present invention is not limited to this.

[0103] In the present embodiment, an example in which the coil unit 1 is applied to the induction heating cooker 100 has been described, but the present invention is not limited to this. The coil unit 1 may be applied to devices other than the induction heating cooker 100.

[0104] A modification of the first embodiment will now be described.

[0105] (Variation 1) Fig. 4 is a plan view of a coil unit 1A of Modification 1. As shown in Fig. 4, in the coil unit 1A, in a plan view, the multiple first coil pieces 10A of the first coil 5AA arranged in the first heating region S10 are arranged so as not to straddle the line CL1. In a plan view, the multiple first coil pieces 10A are arranged at positions sandwiching the line CL1.

[0106] In plan view, the line CL1 is located between the two first coil pieces 10A arranged in the two first coil arrangement regions S11, S12, and between the two first coil pieces 10A arranged in the two first coil arrangement regions S14, S15. The line CL1 extends along the first boundary lines L12, L15 and the second boundary line L23. Specifically, in plan view, the first coil pieces 10A of the coil unit 1A are arranged at an angle of 30 degrees from the first coil pieces 10A of the first embodiment. As a result, the first coil pieces 10A and the second coil pieces 10B are equally separated in the left-right direction (X-axis direction) by the line CL1 and arranged symmetrically with respect to the line CL1.

[0107] In this manner, the position of the first coil piece 10A arranged in the first heating region S10 may be changed, thereby changing the combination of the multiple first coil pieces 10A arranged in the first heating region S10 and the multiple second coil pieces 10B arranged in the second heating region S20, and changing the positions where uniform heating and concentrated heating are performed.

[0108] In the example shown in Figure 4, when the object to be heated is positioned across the first heating region S10 and the second heating region S20, the two first coil pieces 10A positioned in the first coil arrangement regions S11, S12 of the first heating region S10 and the four second coil pieces 10B in the second heating region S20 can be driven to evenly heat the object to be heated.

[0109] (Variation 2) Fig. 5 is a plan view of a coil unit 1B of Modification 2. As shown in Fig. 5, the coil unit 1B is provided with a third heating region S30 having a sector shape, which is provided around the second heating region S20 in the direction in which the first heating region S10 and the second heating region S20 are aligned (Y-axis direction). In Modification 2, the third heating region S30 has the same shape and dimensions as the second heating region S20.

[0110] The third heating region S30 is provided on the rear side of the second heating region S20 in the depth direction (Y-axis direction).

[0111] In a planar view, the third heating region S30 has multiple third coil arrangement regions S31-S34 defined by multiple third boundary lines L31-L35 extending radially from the center C3 of the third heating region S30 toward the outer periphery, and a third outer periphery line L30 that defines the outer periphery of the arc portion of the third heating region S30.

[0112] The third coil 5C arranged in the third heating region S30 has a plurality of third coil pieces 10C arranged in the plurality of third coil arrangement regions S31 to S34, respectively, in a plan view.

[0113] Each of the multiple third coil pieces 10C has a third coil wire 11C that is arranged along two adjacent third boundary lines among multiple third boundary lines L31-L35 that define multiple third coil arrangement regions S31-S34 in a plan view.

[0114] The third coil arrangement regions S31-S34 have substantially the same shape and dimensions in a plan view, and the third coil pieces 10C have substantially the same shape and dimensions in a plan view. The third coil pieces 10C also have substantially the same shape and dimensions as the second coil pieces 10B.

[0115] In a planar view, the multiple second coil pieces 10B arranged in the second heating region S20 and the multiple third coil pieces 10C arranged in the third heating region S30 are arranged symmetrically with respect to a line CL1 passing through the center C2 of the second heating region S20 and the center C3 of the third heating region S30.

[0116] With this configuration, the heating region can be further expanded, and the object to be heated can be heated more efficiently. Also, by individually controlling the first to third coil pieces 10A-10C arranged in the first to third heating regions S10-S30, the object to be heated arranged across the multiple heating regions can be heated more efficiently.

[0117] The third heating region S30 may have a different shape and / or dimensions from the second heating region S20. The third coil piece 10C may have a different shape and / or dimensions from the second coil piece 10B.

[0118] Furthermore, the multiple third coil arrangement regions S31 to S34 may have different shapes and / or sizes in a plan view, and the multiple third coil pieces 10C may have different shapes and / or sizes in a plan view.

[0119] (Variation 3) Fig. 6 is a plan view of a coil unit 1C of Modification 3. As shown in Fig. 6, in the coil unit 1C, a plurality of first coil pieces 10A, a plurality of second coil pieces 10B, and a plurality of third coil pieces 10C are arranged so as not to straddle a line CL1. In a plan view, the line CL1 is a line passing through a center C1 of the first heating region S10, a center C2 of the second heating region S20, and a center C3 of the third heating region S30.

[0120] The first coil pieces 10A, the second coil pieces 10B, and the third coil pieces 10C are equally partitioned in the left-right direction (X-axis direction) by a line CL1. That is, the first coil pieces 10A are arranged symmetrically with respect to the line CL1 in a plan view. The second coil pieces 10B are arranged symmetrically with respect to the line CL1 in a plan view. The third coil pieces 10C are arranged symmetrically with respect to the line CL1 in a plan view.

[0121] This allows the heating object to be heated more efficiently. For example, the heating object arranged across the first heating region S10 and the second heating region S20 can be heated evenly and efficiently using the two first coil pieces 10A in the first heating region S10 and the four second coil pieces 10B in the second heating region S20. Alternatively, the heating object arranged across the second heating region S20 and the third heating region S30 can be heated evenly and efficiently using the two second coil pieces 10B in the second heating region S20 and the four third coil pieces 10C in the third heating region S30.

[0122] (Embodiment 2) Second Embodiment A coil unit according to a second embodiment of the present invention will be described.

[0123] In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the second embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0124] FIG. 7 is a plan view of an example of a coil unit 1D according to the second embodiment of the present disclosure.

[0125] The second embodiment differs from the first embodiment in that the first heating region S10 and the second heating region S20A are spaced apart from each other in plan view, and that the third heating region S30A and the fourth heating region S40 are provided between the first heating region S10 and the second heating region S20A in plan view. The second embodiment also differs from the first embodiment in that the second heating region S20A has a circular shape in plan view.

[0126] As shown in FIG. 7, the coil unit 1D includes a plurality of coils 5A to 5D arranged in a first heating region S10, a second heating region S20A, a third heating region S30A and a fourth heating region S40 for heating an object to be heated in a plan view.

[0127] In a plan view, the first heating region S10 and the second heating region S20A are provided with a gap between them.

[0128] The second heating region S20A has a circular shape with a center C2 in a plan view, and is a region in which the second coil 5B is arranged. The second heating region S20A has a plurality of second coil arrangement regions S21-S26. The plurality of second coil arrangement regions S21-S26 are arranged radially and adjacently around the center C2 of the second heating region S20A in a plan view. Specifically, the plurality of second coil arrangement regions S21-S26 are defined by a plurality of second boundary lines L21-L26 extending radially from the center C2 of the second heating region S20A toward the outer periphery in a plan view, and a second outer periphery line L20A that defines the outer periphery of the second heating region S20A.

[0129] In this embodiment, the second heating region S20A has substantially the same shape and dimensions as the first heating region S10 in a plan view. In addition, the distance between the first heating region S10 and the second heating region S20A in a plan view is smaller than the diameter of the first heating region S10 and / or the diameter of the second heating region S20A.

[0130] The second coil pieces 10B are arranged in each of the plurality of second coil arrangement regions S21 to S26.

[0131] The third heating region S30A is provided between the first heating region S10 and the second heating region S20A in a plan view. The third heating region S30A is defined by a first line L31A, a second line L32A intersecting the first line L31A, and a third line L33A connecting the first line L31A and the second line L32A in a plan view.

[0132] In this embodiment, the first line L31A and the second line L32A are straight lines. The third line L33A is an arc-shaped line in a plan view. The third heating region S30A has a sector shape in a plan view.

[0133] The third heating region S30A is smaller than the first heating region S10 and the second heating region S20A in a plan view. Specifically, the third heating region S30A has substantially the same shape and dimensions as one of the first coil arrangement regions S11 or one of the second coil arrangement regions S21.

[0134] In plan view, the intersection P1 where the first line L31A and the second line L32A intersect is located between the first heating region S10 and the second heating region S20A. As a result, in the third heating region S30A, at least the region including the intersection P1 is located between the first heating region S10 and the second heating region S20A in plan view.

[0135] A third coil 5C is disposed in the third heating region S30A. The third coil 5C is composed of one third coil piece 10C. The third coil piece 10C has a third coil wire 11C that is disposed along the first line L31A, the second line L32A, and the third line L33A in a plan view.

[0136] The fourth heating region S40 is provided between the first heating region S10 and the second heating region S20A in a position facing the third heating region S30A in a plan view. Specifically, the fourth heating region S40 is provided facing each other in a direction (X-axis direction) intersecting with the direction in which the first heating region S10 and the second heating region S20A are arranged (Y-axis direction) in a plan view.

[0137] A fourth coil 5D is disposed in the fourth heating region S40. The fourth coil 5D is composed of one fourth coil piece 10D. The fourth coil piece 10D has a fourth coil wire 11D that is disposed along a fourth line L41, a fifth line L42, and a sixth line L43 in a plan view.

[0138] In this embodiment, the fourth line L41 and the fifth line L42 are straight lines. The sixth line L43 is an arc-shaped line in a plan view. The fourth heating region S40 has a sector shape in a plan view.

[0139] In a plan view, an intersection P2 where the fourth line L41 and the fifth line L42 intersect is located between the first heating region S10 and the second heating region S20A. As a result, a region in the fourth heating region S40 that includes at least the intersection P2 is located between the first heating region S10 and the second heating region S20A in a plan view.

[0140] In this embodiment, the fourth heating region S40 and the fourth coil piece 10D have substantially the same shape and dimensions as the third heating region S30A and the third coil piece 10C. The intersections P1 and P2 coincide in a plan view and are located on a line CL1 passing through the center C1 of the first heating region S10 and the center C2 of the second heating region S20A. The third heating region S30A and the fourth heating region S40 are disposed symmetrically with respect to the line CL1 in a plan view.

[0141] [effect] According to the coil unit 1D of the second embodiment, the following effects can be achieved.

[0142] The coil unit 1D according to the second embodiment of the present disclosure includes, in a plan view, a plurality of coils 5A-5C arranged in a first heating region S10, a second heating region S20A, and a third heating region S30A that heat an object to be heated. In a plan view, the first heating region S10 and the second heating region S20A are provided with a gap between them. In a plan view, the third heating region S30A is provided between the first heating region S10 and the second heating region S20A. In a plan view, the third heating region S30A is defined by a first line L31A, a second line L32A intersecting the first line L31A, and a third line L33A connecting the first line L31A and the second line L32A.

[0143] With this configuration, the object to be heated can be heated efficiently. According to the coil unit 1D, the third heating area S30A defined by the first line L31A, the second line L32A, and the third line L33A is provided in the space between the first heating area S10 and the second heating area S20A. This allows the third heating area S30A to be provided in an area that is difficult to heat, thereby widening the heating range. As a result, uneven heating is reduced, and the object to be heated can be heated efficiently.

[0144] The third coil 5C arranged in the third heating region S30A includes a coil piece 10C having a coil wire 11C arranged along the first line L31A, the second line L32A, and the third line L33A in a plan view. With this configuration, the object to be heated can be heated more efficiently.

[0145] The first line L31A and the second line L32A are straight lines. In a plan view, the intersection point P1 where the first line L31A and the second line L32A intersect is located between the first heating region S10 and the second heating region S20A. With this configuration, in a plan view, it is easy to provide the third heating region S30A between the first heating region S10 and the second heating region S20A. For example, when the first heating region S10 and the second heating region S20A have a circular shape in a plan view, the third heating region S30A can be provided so that the intersection point P1 is inserted between the first heating region S10 and the second heating region S20A. This makes it possible to reduce the space between the first heating region S10 and the third heating region S30A and between the second heating region S20A and the third heating region S30A. As a result, the region that is difficult to heat is reduced, and the heating object can be heated more efficiently.

[0146] In plan view, a fourth heating region S40 is provided between the first heating region S10 and the second heating region S20A at a position facing the third heating region S30A. The coils include a fourth coil 5D disposed in the fourth heating region S40. In plan view, the fourth heating region S40 is defined by a fourth line L41, a fifth line L42 intersecting the fourth line L41, and a sixth line L43 connecting the fourth line L41 and the fifth line L42. With this configuration, the heating region can be further expanded, and the heating object can be heated more efficiently.

[0147] The fourth coil 5D arranged in the fourth heating region S40 includes a fourth coil piece 10D having a fourth coil wire 11D arranged along a fourth line L41, a fifth line L42, and a sixth line L43 in a plan view. With this configuration, the object to be heated can be heated more efficiently.

[0148] The fourth line L41 and the fifth line L42 are straight lines. In a plan view, an intersection point P2 where the fourth line L41 and the fifth line L42 intersect is located between the first heating region S10 and the second heating region S20A. With this configuration, in a plan view, it is easy to provide the fourth heating region S40 between the first heating region S10 and the second heating region S20A. In addition, the space between the first heating region S10 and the third heating region S30A and between the second heating region S20A and the third heating region S30A can be reduced. As a result, the region that is difficult to heat is reduced, and the heating object can be heated more efficiently.

[0149] The first heating region S10 has a circular shape with a center C1 in a plan view, and the second heating region S20A has a circular shape with a center C2 in a plan view. In a plan view, an intersection P1 where the first line L31A and the second line L32A intersect and an intersection P2 where the fourth line L41 and the fifth line L42 intersect are located on a line CL1 passing through the center C1 of the first heating region S10 and the center C2 of the second heating region S20A. With this configuration, it is possible to further reduce uneven heating and to more efficiently heat the object to be heated.

[0150] In the present embodiment, the first heating region S10 and the second heating region S20A are circular in plan view, but are not limited thereto. For example, the first heating region S10 and the second heating region S20A may be elliptical or polygonal in plan view.

[0151] In the present embodiment, the second heating region S20A has substantially the same shape and dimensions as the first heating region S10, but is not limited thereto. The second heating region S20A may have a different shape and / or dimensions from the first heating region S10.

[0152] In the present embodiment, the third heating region S30A has a sector shape in plan view, but is not limited thereto. For example, the third heating region S30A may have a triangular shape in plan view.

[0153] In the present embodiment, an example in which the fourth heating region S40 is provided between the first heating region S10 and the second heating region S20A has been described, but the present invention is not limited to this. For example, the fourth heating region S40 does not have to be provided.

[0154] In the present embodiment, the third heating region S30A and the fourth heating region S40 are arranged symmetrically with respect to the line CL1 in a plan view, but the present invention is not limited to this. For example, the third heating region S30A and the fourth heating region S40 do not have to be arranged symmetrically with respect to the line CL1 in a plan view.

[0155] In the present embodiment, an example has been described in which the fourth heating region S40 and the fourth coil piece 10D have substantially the same shape and dimensions as the third heating region S30A and the third coil piece 10C, but this is not limiting. For example, the fourth heating region S40 and the fourth coil piece 10D may have a different shape and / or dimensions from the third heating region S30A and the third coil piece 10C.

[0156] In the present embodiment, an example has been described in which one third coil piece 10C and one fourth coil piece 10D are arranged in the third heating region S30A and the fourth heating region S40, respectively, but the present invention is not limited to this. For example, one or more third coil pieces 10C and one or more fourth coil pieces 10D may be arranged in the third heating region S30A and the fourth heating region S40, respectively.

[0157] In the present embodiment, the first line L31A, the second line L32A, the fourth line L41, and the fifth line L42 are linear lines, but the present invention is not limited to this. For example, the first line L31A, the second line L32A, the fourth line L41, and / or the fifth line L42 may be curved lines.

[0158] In the present embodiment, an example in which the third line L33A and the sixth line L43 are arc-shaped lines has been described, but the present invention is not limited thereto. For example, the third line L33A and / or the sixth line L43 may be straight lines.

[0159] A modification of the second embodiment will now be described.

[0160] Fig. 8 is a plan view of a coil unit 1E of Modification 4. As shown in Fig. 8, in the coil unit 1E, a plurality of first coil pieces 10A, a plurality of second coil pieces 10B, a third coil piece 10C, and a fourth coil piece 10D are arranged so as not to straddle a line CL1. In a plan view, the line CL1 is a line that passes through a center C1 of the first heating region S10, a center C2 of the second heating region S20A, an intersection P1 of the third heating region S30A, and an intersection P2 of the fourth heating region S40.

[0161] The first coil pieces 10A and the second coil pieces 10B are equally divided by a line CL1. That is, the first coil pieces 10A are arranged symmetrically with respect to the line CL1 in a plan view. The second coil pieces 10B are arranged symmetrically with respect to the line CL1 in a plan view.

[0162] The third coil piece 10C and the fourth coil piece 10D are disposed symmetrically with respect to a line CL1 in a plan view.

[0163] This makes it possible to heat the object to be heated more efficiently. For example, a heating object that is disposed across the first heating region S10, the second heating region S20A, the third heating region S30A, and the fourth heating region S40 can be heated evenly and efficiently using two first coil pieces 10A in the first heating region S10, two second coil pieces 10B in the second heating region S20, one third coil piece 10C, and one fourth coil piece 10D.

[0164] (Embodiment 3) An induction heating cooker according to a third embodiment of the present invention will be described.

[0165] In the third embodiment, differences from the first embodiment will be mainly described. In the third embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the third embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0166] Fig. 9 is a schematic diagram of an example of an induction heating cooker 100A according to a third embodiment of the present disclosure. Fig. 10 is a schematic enlarged view of the coil unit 2 arranged in the third area S103 in Fig. 9.

[0167] In the third embodiment, an induction heating cooker 100A including the coil unit 1 of the first embodiment will be described.

[0168] 9, the induction heating cooker 100A includes a top plate 3 and a plurality of coil units 1, 2 disposed below the top plate 3. In this specification, the coil unit 1 is referred to as a first coil unit 1, and the coil unit 2 is referred to as a second coil unit 2.

[0169] The top plate 3 has a rectangular shape in a plan view. In the plan view, a first exhaust port 6A and a second exhaust port 6B are provided on the rear side of the top plate 3 in the depth direction (Y-axis direction).

[0170] In a plan view, the first exhaust port 6A and the second exhaust port 6B are provided at corner portions on the far side in the depth direction (Y-axis direction) of the top plate 3. The first exhaust port 6A and the second exhaust port 6B are arranged at an interval from each other in the left-right direction (X-axis direction).

[0171] A first region S101, a second region S102, and a third region S103 are provided on the top plate 3. The first region S101, the second region S102, and the third region S103 are regions where an object to be heated is placed and where the object to be heated is heated. In other words, the first region S101, the second region S102, and the third region S103 are regions where a plurality of coil units 1 and 2 that inductively heat the object to be heated are arranged in a plan view.

[0172] In plan view, the first region S101 and the second region S102 are provided with a gap between them. In this embodiment, in plan view, the first region S101 and the second region S102 are arranged with a gap between them in the left-right direction (X-axis direction).

[0173] In plan view, the first region S101 and the second region S102 have a substantially rectangular shape with a long side in the depth direction (Y-axis direction) and a short side in the left-right direction (X-axis direction). For example, in plan view, the distance between the first region S101 and the second region S102 in the left-right direction (X-axis direction) is smaller than the dimension of the first region S101 and the second region S102 in the short side direction (X-axis direction).

[0174] In this embodiment, the first region S101 and the second region S102 have substantially the same shape and substantially the same dimensions in a plan view.

[0175] The first region S101 and the second region S102 each include a first coil unit 1. The third region S103 is provided between the first region S101 and the second region S102 in a plan view.

[0176] As shown in FIG. 10, the third region S103 is defined in a plan view by a first line L101, a second line L102 intersecting the first line L101, and a third line L103 connecting the first line L101 and the second line L102.

[0177] In this embodiment, the first line L101, the second line L102, and the third line L103 are straight lines. The third region S103 has a triangular shape in a plan view.

[0178] In plan view, an intersection P10 where the first line L101 and the second line L102 intersect is located between the first region S101 and the second region S102. The intersection P10 is the apex of a triangle in the third region S103 in plan view. The intersection P10 is disposed facing a direction (Y-axis direction) perpendicular to the direction in which the first region S101 and the second region S102 are aligned (X-axis direction). As a result, in plan view, a region of the third region S103 including at least the intersection P10 is located between the first region S101 and the second region S102.

[0179] In plan view, the third region S103 is provided on the rear side in the depth direction (Y-axis direction) of the top plate 3. Specifically, in plan view, a part of the third region S103 is provided between the first exhaust port 6A and the second exhaust port 6B.

[0180] The second coil unit 2 is disposed in the third region S103. The coil unit 2 includes a plurality of coil pieces 10E having coil wires 11E disposed along two adjacent lines among the first line L101, the second line L102, and the third line L103 in a plan view. The plurality of coil pieces 10E have substantially the same shape and substantially the same dimensions.

[0181] The multiple coil pieces 10E can be individually controlled by a control unit.

[0182] In this embodiment, three coil pieces 10E are arranged in the third region S103. Furthermore, the coil pieces 10E have substantially the same shape as the first coil piece 10A and / or the second coil piece 10B.

[0183] [effect] According to the induction heating cooker 100A according to the third embodiment, the following effects can be achieved.

[0184] The induction heating cooker 100A according to the third embodiment of the present disclosure includes a top plate 3 on which an object to be heated is placed, and a plurality of coil units 1 and 2. The plurality of coil units 1 and 2 are arranged in a first region S101, a second region S102, and a third region S103 in a plan view, which heat the object to be heated placed on the top plate 3. In a plan view, the first region S101 and the second region S102 are provided with a gap between them. In a plan view, the third region S103 is provided between the first region S101 and the second region S102. In a plan view, the third region S103 is defined by a first line L101, a second line L102 intersecting the first line L101, and a third line L103 connecting the first line L101 and the second line L102.

[0185] With this configuration, the object to be heated can be heated efficiently. According to the induction heating cooker 100A, the third area S103 defined by the first line L101, the second line L102, and the third line L103 is provided in the space between the first area S101 and the second area S102. This allows the third area S103 to be provided in an area that is difficult to heat, thereby widening the heating range. As a result, uneven heating is reduced, and the object to be heated can be heated efficiently.

[0186] The second coil unit 2 arranged in the third region S103 includes a plurality of coil pieces 10E having coil wires 11E arranged along two adjacent lines among the first line L101, the second line L102, and the third line L103. With this configuration, the gaps between the plurality of coil pieces 10E arranged in the third region S103 can be reduced, so that the object to be heated can be heated more efficiently.

[0187] The first line L101 and the second line L102 are straight lines. In a plan view, an intersection P10 where the first line L101 and the second line L102 intersect is located between the first region S101 and the second region S102. With this configuration, in a plan view, it is easy to provide the third region S103 between the first region S101 and the second region S102. For example, in a plan view, the third region S103 can be provided so as to insert the intersection P10 between the first region S101 and the second region S102. As a result, the region that is difficult to heat can be reduced, and the heating object can be heated more efficiently.

[0188] The third region S103 has a triangular shape in plan view. In addition, in plan view, the apex P10 of the triangle of the third region S103 is arranged facing a direction (Y-axis direction) perpendicular to the direction (X-axis direction) in which the first region S101 and the second region S102 are arranged. With this configuration, in plan view, it becomes easier to provide the third region S103 between the first region S101 and the second region S102. In addition, the space between the first region S101 and the second region S102 can be effectively used to expand the heating region.

[0189] The top plate 3 has a left-right direction (X-axis direction) and a depth direction (Y-axis direction) perpendicular to the left-right direction in a plan view. The first region S101 and the second region S102 are provided at an interval in the left-right direction (X-axis direction) of the top plate 3 in a plan view. The third region S103 is provided on the back side of the top plate 3 in the depth direction (Y-axis direction) in a plan view. With this configuration, the third region S103 can be provided in a region at the back of the top plate 3 in the depth direction, and the heating region can be expanded while effectively utilizing the space.

[0190] In plan view, a first exhaust port 6A and a second exhaust port 6B are provided on the rear side of the top plate 3 in the depth direction (Y-axis direction). The first exhaust port 6A and the second exhaust port 6B are provided with a gap in the left-right direction (X-axis direction) of the top plate 3. In plan view, a part of the third region S103 is provided between the first exhaust port 6A and the second exhaust port 6B. With this configuration, by providing a part of the third region S103 between the first exhaust port 6A and the second exhaust port 6B, it is possible to effectively use the space and expand the heating region.

[0191] In the present embodiment, the coil unit 1 according to the first embodiment is arranged in the first region S101 and the second region S102, but the present invention is not limited to this. For example, any coil unit may be arranged in the first region S101 and the second region S102.

[0192] In the present embodiment, the first region S101 and the second region S102 are provided with a gap in the left-right direction (X-axis direction) but are not limited thereto. For example, the first region S101 and the second region S102 may be arranged with a gap in the depth direction (Y-axis direction).

[0193] In the present embodiment, an example in which the first region S101 and the second region S102 have a substantially rectangular shape in a plan view has been described, but the present invention is not limited thereto. The shapes and dimensions of the first region S101 and the second region S102 in a plan view may be changed according to the shape and dimensions of the coil unit. The second region S102 may have a shape and / or dimensions different from those of the first region S101. For example, the first region S101 and the second region S102 may have a circular, elliptical, or polygonal shape in a plan view.

[0194] In the present embodiment, an example has been described in which the third region S103 is provided on the far side in the depth direction (Y-axis direction) of the top plate 3 in a plan view, but the present invention is not limited thereto. For example, the third region S103 may be provided on the near side in the depth direction (Y-axis direction) of the top plate 3 in a plan view. Alternatively, when the first region S101 and the second region S102 are disposed with an interval in the depth direction (Y-axis direction), the third region S103 may be provided on the left or right side in the left-right direction (X-axis direction) of the top plate 3 in a plan view.

[0195] In the present embodiment, an example in which the third region S103 has a triangular shape in a plan view has been described, but the present invention is not limited thereto. The third region S103 may have a shape defined by three lines, the first line L101, the second line L102, and the third line L103. For example, the third region S103 may have a sector shape in a plan view.

[0196] In the present embodiment, an example in which multiple coil pieces 10E are arranged in the third region S103 in a plan view has been described, but the present invention is not limited to this. For example, one or more coil pieces 10E may be arranged in the third region S103.

[0197] In the present embodiment, an example has been described in which the coil piece 10E constituting the second coil unit 2 arranged in the third region S103 has substantially the same shape and dimensions as the first coil piece 10A and / or the second coil piece 10, but is not limited to this. For example, the coil piece 10E may have a different shape and / or dimensions from the first coil piece 10A and the second coil piece 10.

[0198] A modification of the third embodiment will now be described.

[0199] (Variation 5) Fig. 11 is a schematic diagram of an induction heating cooker 100B of modified example 5. Fig. 12 is a schematic enlarged diagram of coil units 2A, 2B arranged in the third area S103A and the fourth area S104 in Fig. 11.

[0200] As shown in FIG. 11, in the induction heating cooker 100B, a third region S103A and a fourth region S104 are provided between a first region S101 and a second region S102 in a plan view.

[0201] The third region S103A and the fourth region S104 are provided to face each other in a plan view. Specifically, the third region S103A and the fourth region S104 are provided to face each other in a direction (Y-axis direction) perpendicular to the direction (X-axis direction) in which the first region S101 and the second region S102 are arranged.

[0202] The fourth region S104 is provided on the rear side in the depth direction of the top plate 3 (Y-axis direction) relative to the third region S103A.

[0203] As shown in FIG. 12, the third region S103A is defined in a plan view by a first line L101A, a second line L102A intersecting the first line L101A, and a third line L103A connecting the first line L101A and the second line L102A.

[0204] The coil unit 2A arranged in the third region S103A includes one coil piece 10E. The coil piece 10E has a coil wire 11E that is arranged along a first line L101A, a second line L102A, and a third line L103A in a plan view.

[0205] The first line L101A and the second line L102A are straight lines. The third line L103A is an arc-shaped line in a plan view. The third region S103A has a sector shape in a plan view. Therefore, the coil piece 10E also has a sector shape in a plan view.

[0206] An intersection P11 where the first line L101A and the second line L102A intersect is located between the first region S101 and the second region S102. The intersection P10 is located on a line CL2 drawn along a direction (Y-axis direction) perpendicular to the direction (X-axis direction) in which the first region S101 and the second region S102 are aligned.

[0207] The fourth region S104 is defined, in a plan view, by a fourth line L104, a fifth line L105 intersecting the fourth line L104, and a sixth line L106 connecting the fourth line L104 and the fifth line L105.

[0208] The coil unit 2B arranged in the fourth region S104 includes one coil piece 10F. The coil piece 10F has a coil wire 11F that is arranged along a fourth line L104, a fifth line L105, and a sixth line L106 in a plan view. Therefore, the coil piece 10F has a sector shape in a plan view.

[0209] The fourth line L104 and the fifth line L105 are straight lines. The sixth line L106 is an arc-shaped line in a plan view. The fourth region S104 has a sector shape in a plan view. Therefore, the coil piece 10F also has a sector shape in a plan view.

[0210] An intersection point P12 where the fourth line L104 and the fifth line L105 intersect is located on a line CL2 drawn along a direction (Y-axis direction) perpendicular to the direction (X-axis direction) in which the first region S101 and the second region S102 are aligned.

[0211] In plan view, the third line L103A of the third region S103A and the sixth line L106 of the fourth region S104 face each other. Specifically, in plan view, the third region S103A and the fourth region S104 are provided symmetrically in the depth direction (Y-axis direction) of the top plate 3.

[0212] The third region S103A and the fourth region S104 have substantially the same shape and dimensions in a plan view. The third region S103A and the fourth region S104 have substantially the same shape and dimensions as the first coil arrangement regions S11-S16 and / or the second coil arrangement regions S21-S24 in a plan view. Furthermore, the coil pieces 10E, 10F have substantially the same shape and dimensions as the first coil piece 10A and / or the second coil piece 10B.

[0213] The coil pieces 10E arranged in the third region S103A and the coil pieces 10F arranged in the fourth region S104 can be individually controlled by a controller.

[0214] Even with such a configuration, the object to be heated can be efficiently heated. Also, the heating range can be expanded, heating unevenness can be reduced, and the object to be heated can be efficiently heated.

[0215] The third region S103A and the fourth region S104 are not limited to a sector shape in a plan view, and may have, for example, a triangular shape. The third region S103A and the fourth region S104 may have different shapes and / or dimensions.

[0216] As described above, the above embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate.

[0217] For example, the coil pieces of the modified examples described below can be used for the coil units and induction heating cookers described in embodiments 1 to 3. The following description will mainly focus on the differences from the first coil piece 10A described in embodiment 1.

[0218] (Variation 6) Fig. 13 is a schematic enlarged view of a coil piece 10AA of modification 6. As shown in Fig. 13, in the coil piece 10AA, the coil wire 11AA is composed of a first coil wire portion 20 and a second coil wire portion 30A. In a plan view, the line width W2 of the second coil wire portion 30A is larger than the line width W1 of the first coil wire portion 20.

[0219] The second coil wire portion 30A has straight portions 31A, 32A, a curved portion 33A, and connection portions 34A, 35A, and 36A. Straight portions 31A, 32A, curved portion 33A, and connection portions 34A, 35A, and 36A are similar to straight portions 31, 32, curved portion 33, and connection portions 34, 35, and 36 of the first embodiment, except that they have different line widths in a plan view.

[0220] In plan view, a gap SP1 is formed between the first coil wire portion 20 and the second coil wire portion 30A on the center C1 side of the first heating region S10. Specifically, in plan view, the line width W2 of the second coil wire portion 30A is larger than the line width W1 of the first coil wire portion 20, and therefore the radius of the roundness of the connection portion 34A is larger than the radius of the roundness of the connection portion 24. For this reason, in plan view, a gap SP1 is formed between the connection portion 24 arranged on the center C1 side of the first heating region S10 and the connection portion 34A. In plan view, the gap SP1 is large enough to accommodate electronic components such as ferrite and a temperature sensor.

[0221] With this configuration, coil piece 10AA can be manufactured more easily than in the first embodiment, and manufacturing costs can be reduced.

[0222] (Variation 7) Fig. 14 is a schematic enlarged view of a coil piece 10AB of modification example 7. As shown in Fig. 14, in the coil piece 10AB, the third coil wire portion 40B is disposed on the central side of the inner region surrounded by the second coil wire portion 30 in a plan view.

[0223] In plan view, the third coil wire portion 40B is not disposed along the inside of the second coil wire portion 30, but is disposed on the central side of the inner region surrounded by the second coil wire portion 30. Specifically, the third coil wire portion 40B is formed in a substantially triangular frame shape in plan view.

[0224] The third coil wire portion 40B has straight portions 41B, 42B, 43B and connection portions 44B, 45B, 46B. The third coil wire portion 40B is similar to the third coil wire portion 40 of the first embodiment except for the straight portion 43B and its arrangement position.

[0225] In a plan view, the straight portions 41B, 42B, 43B of the third coil wire portion 40B are not disposed along the straight portions 31, 32 and the curved portion 33 of the second coil wire portion 30. Specifically, in a plan view, the connection portions 44B, 45B, 46B of the third coil wire portion 40B are disposed close to the centers of the straight portions 31, 32 and the curved portion 33 of the second coil wire portion 30, respectively. As a result, in a plan view, the straight portions 41B, 42B, 43B of the third coil wire portion 40B are disposed at positions farther away from the connection portions 44B, 45B, 46B and the straight portions 31, 32 and the curved portion 33 of the second coil wire portion 30, respectively.

[0226] In a plan view, straight portions 41B, 42B, and 43B of the third coil wire portion 40B extend in a direction intersecting with straight portions 31 and 32 and curved portion 33 of the second coil wire portion 30, respectively. Specifically, straight portion 41B extends in a direction away from straight portion 31 toward the outer periphery of the first heating region S10 in a plan view. Straight portion 42B extends in a direction away from straight portion 32 toward the outer periphery of the first heating region S10 in a plan view. Straight portion 43B is disposed on the center C1 side of the first heating region S10 in a plan view, and extends in a direction intersecting with straight portions 31 and 32.

[0227] In plan view, the third coil wire portion 40B is not disposed along the inside of the second coil wire portion 30, so a gap SP2 is formed between the second coil wire portion 30 and the third coil wire portion 40B on the center C1 side of the first heating region S10. In plan view, the gap SP2 is large enough to accommodate electronic components such as ferrite and a temperature sensor.

[0228] With this configuration, the area in the first heating region S10 where the coil wire 11AB is not disposed can be made smaller in plan view, thereby reducing uneven heating and enabling efficient heating.

[0229] (Variation 8) Fig. 15 is a schematic enlarged view of a coil piece 10AC of modification 8. As shown in Fig. 14, in the coil piece 10AC, the second coil wire portion 30C is disposed so as to become increasingly farther away from the first coil wire portion 20 as it moves from the center C1 of the first heating region S10 toward the outer periphery in a plan view. Moreover, the third coil wire portion 40C is disposed on the outer periphery side of the center C1 of the first heating region S10 in a plan view.

[0230] The second coil wire portion 30C has straight portions 31C, 32C, and 33C and connection portions 34C, 35C, and 36C. The second coil wire portion 30C is similar to the second coil wire portion 30 of the first embodiment, except for the straight portions 31C, 32C, and 33C.

[0231] In a plan view, straight portions 31C, 32C of second coil wire portion 30C are disposed farther away from straight portions 21, 22 of first coil wire portion 20 as they move from center C1 of first heating region S10 toward the outer periphery. That is, in a plan view, the distance between straight portion 21 and straight portion 31C and the distance between straight portion 22 and straight portion 32C increase as they move from center C1 of first heating region S10 toward the outer periphery.

[0232] The third coil wire portion 40C has straight portions 41C, 42C, 43C and connection portions 44C, 45C, 46C. In plan view, the line width W13 of the third coil wire portion 40C is greater than the line width W11 of the first coil wire portion 20 and the line width W12 of the second coil wire portion 30C. In plan view, the third coil wire portion 40C is formed in a substantially egg-shaped frame shape.

[0233] The third coil wire portion 40C is disposed on the outer periphery side of the center C1 of the first heating region S10 in a plan view. As a result, a gap SP3 is formed between the second coil wire portion 30C and the third coil wire portion 40C on the center C1 side of the first heating region S10 in a plan view. In a plan view, the gap SP3 is large enough to accommodate electronic components such as ferrite or a temperature sensor.

[0234] With this configuration, in a plan view, the coil wire 11AC can be densely packed near the center of the first heating region S10, and can be dispersed from the center C1 of the first heating region S10 toward the outer periphery. This allows magnetic flux to be concentrated near the center of the first heating region S10, and magnetic flux to be generated evenly from the center C1 of the first heating region S10 toward the outer periphery.

[0235] (Variation 9) Fig. 16 is a schematic enlarged view of a coil piece 10AD of modification 9. As shown in Fig. 16, in the coil piece 10AD, the first coil arrangement region S11 is divided into a first arrangement region S111 and a second arrangement region S112. The coil piece 10AD also has a first coil wire 11DA arranged in the first arrangement region S111 and a second coil wire 11DB arranged in the second arrangement region.

[0236] The first arrangement region S111 is an area formed on the center C1 side of the first heating region S10 in a plan view. The second arrangement region S112 is an area disposed outside the first arrangement region S111 in a plan view. The first arrangement region S111 and the second arrangement region S112 are separated by an intermediate line L17 that connects two adjacent first boundary lines L11, L12 between the center C1 of the first heating region S10 and the first outer circumferential line L10 in a plan view.

[0237] Specifically, the first arrangement region S111 is defined by two adjacent first boundary lines L11, L12 and an intermediate line L17 in a plan view. The second arrangement region S112 is defined by two adjacent first boundary lines L11, L12, a first outer perimeter line L10 and an intermediate line L17 in a plan view. The first arrangement region S111 has a substantially triangular shape. The second arrangement region S112 has a substantially trapezoidal shape.

[0238] The first coil wire 11DA is arranged along two adjacent first boundary lines L11, L12 and the intermediate line L17 in the first arrangement region S111 in a plan view. The first coil wire 11DA has straight portions 61, 62, 63 and connection portions 64, 65, 66. The straight portions 61, 62, 63 are arranged along the first boundary lines L11, L12 and the intermediate line L17 in a plan view, respectively. The connection portion 64 connects one end of the straight portion 61 to one end of the straight portion 62. The connection portion 65 connects the other end of the straight portion 61 to one end of the straight portion 63. The connection portion 65 connects the other end of the straight portion 62 to the other end of the straight portion 63. The connection portions 64, 65, 66 have, for example, a U-shaped curved shape. The first coil wire 11DA is formed in a substantially triangular frame shape in a plan view.

[0239] The second coil wire 11DB is arranged in the second arrangement region S112 along two adjacent first boundary lines L11, L12, the first outer circumferential line L10, and the intermediate line L17 in a plan view. The second coil wire 11DB has a first coil wire portion 20D, a second coil wire portion 30D, and a third coil wire portion 40D. The first coil wire portion 20D, the second coil wire portion 30D, and the third coil wire portion 40D are similar to the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 of the first embodiment, except that the first coil wire portion 20D is arranged along the intermediate line L17 in a plan view. The second coil wire 11DB is formed in a substantially trapezoidal frame shape in a plan view.

[0240] The first coil wire 11DA and the second coil wire 11DB are not connected. Therefore, in the coil piece 10AD, partial heating by the first coil wire 11DA, partial heating by the second coil wire 11DB, and overall heating by the first coil wire 11DA and the second coil wire 11DB can be performed.

[0241] With this configuration, the strength of heating can be adjusted between the center side and the outer periphery side of the first heating region S10 in a plan view. Specifically, in the vicinity of the center of the first heating region S10 in a plan view, partial heating can be performed by the first coil wire 11DA arranged in the first arrangement region S111. In addition, in the vicinity of the outer periphery of the first heating region S10 in a plan view, partial heating can be performed by the second coil wire 11DB arranged in the second arrangement region S112. In addition, in the entire first heating region S10 in a plan view, total heating can be performed by the first coil wire 11DA and the second coil wire 11DB.

[0242] (Variation 10) Fig. 17 is a plan view of a first coil 5G of the tenth modification. As shown in Fig. 17, the first heating region S10 has four first coil arrangement regions S11-S14 in a plan view. The four first coil arrangement regions S11-S14 are defined by four first boundary lines L11-L14 extending radially from the center C1 of the first heating region S10 toward the outer periphery in a plan view, and a first outer periphery line L10 that defines the outer periphery of the first heating region S10. In the first coil 5G, four coil pieces 10G are disposed in the four first coil arrangement regions S11-S14, respectively.

[0243] In the coil piece 10G, the line width of the coil wire 11G is larger in plan view than in the first embodiment. In the coil piece 10G, a gap SP4 is formed between the outer coil wire portion and the inner coil wire portion on the center C1 side of the first heating region S10 in plan view. For example, a temperature sensor can be disposed in the gap SP4.

[0244] Even with such a configuration, the effects of the present disclosure can be achieved.

[0245] The coil pieces of the above-described modified examples are applicable to coil pieces arranged in the second heating region S20 and / or the third heating region S30, etc.

[0246] Although the present invention has been fully described in connection with the preferred embodiment with reference to the accompanying drawings, various changes and modifications will become apparent to those skilled in the art, and such changes and modifications are to be understood as being included within the scope of the present invention as defined by the appended claims, unless they depart therefrom. [Industrial Applicability]

[0247] The coil unit of the present disclosure can be applied to devices that use electromagnetic induction, in addition to induction heating cookers. For example, the coil unit of the present disclosure can be used as a power supply coil unit for a non-contact power supply device. In this case, the coil unit can improve the power supply efficiency, rather than the heating efficiency. [Explanation of symbols]

[0248] 1,1A,1B,1C,1D,1E Coil unit 2,2A,2B Coil unit 3 Top Plate 4. Chassis 5A, 5B, 5C, 5D, 5E, 5F, 5G Coils 5AA coil 6A First exhaust port 6B Second exhaust port 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G Coil piece 10AA, 10AB, 10AC, 10AD coil pieces 11, 11A, 11B, 11C, 11D, 11E, 11F, 11G Coil wire 11AA, 11AB, 11AC, 11AD, 11DA, 11DB Coil wire 20,20D First coil wire section 21,22 Straight section 23 Curved section 24,25,26 Connections 30, 30A, 30C, 30D Second coil wire section 31,31A,31C Straight section 32,32A,32C Straight section 33,33A curved part 33C Straight section 34, 34A, 34C Connection 35, 35A, 35C Connection 36, 36A, 36C Connection 40, 40B, 40C, 40D Third coil wire section 41,41B,41C Straight section 42,42B,42C Straight section 43 Curved section 43B,43C Straight section 44, 44B, 44C Connection 45, 45B, 45C Connection 46, 46B, 46C Connection 61,62,63 Straight section 64,65,66 Connections 100,100A, 100B induction cooker C1,C2,C3 center CL1,CL2 line L10 First Circumference Line L11, L12, L13, L14, L15, L16 First boundary line L17 Intermediate Line L20, L20A Second outer perimeter line L21, L22, L23, L24, L25, L26 Second boundary line L30 3rd Circumference Line L31, L32, L33, L34, L35 Third boundary line L31A, L32A, L33A Line L41, L42, L43 lines L101, L102, L103, L104, L105, L106 lines L101A, L102A, L103A Line P1,P2,P10,P11,P12 intersection S10,S20,S20A,S30,S30A,S40 heating area S11, S12, S13, S14, S15, S16 First coil arrangement area S21, S22, S23, S24, S25, S26 Second coil arrangement area S31, S32, S33, S34 Third coil arrangement area S111,S112 Placement area S101,S102,S103,S103A,S104 area SP1, SP2, SP3, SP4 gap W1, W2, W11, W12, W13 Line width

Claims

1. A heating device according to the present invention includes a first heating region and a second heating region, the first heating region and the second heating region being arranged to heat an object to be heated in a plan view. The second heating region is In a plan view, the heating element is provided around the first heating region and has a sector shape; In a plan view, the coil arrangement region is defined by a plurality of boundary lines extending radially from a center of the second heating region toward an outer periphery and an outer periphery line defining an outer periphery of an arc portion of the second heating region, the coil arranged in the second heating region has a plurality of coil pieces arranged in the plurality of coil arrangement regions, respectively, in a plan view; Each of the coil pieces in the second heating region has a coil wire that is arranged along two adjacent boundary lines among the boundary lines that define the coil arrangement regions in a plan view, The coil wire is a first coil wire portion disposed along the two adjacent boundary lines and the outer circumferential line in a plan view; a second coil wire portion disposed inside the first coil wire portion in a plan view; having Coil unit.

2. the second coil wire portion is disposed along an inner side of the first coil wire portion in a plan view; The coil unit according to claim 1 .

3. the coil wire further includes a third coil wire portion disposed inside the second coil wire portion in a plan view, the third coil wire portion is disposed along an inner side of the second coil wire portion in a plan view; The coil unit according to claim 2 .

4. The line width of the first coil wire portion is different from the line width of the second coil wire portion. The coil unit according to claim 2 or 3.

5. The line width of the second coil wire portion is larger than the line width of the first coil wire portion. The coil unit according to any one of claims 2 to 4.

6. In a plan view, a gap is formed between the first coil wire portion and the second coil wire portion on a center side of the second heating region. The coil unit according to claim 5.

7. further comprising ferrite disposed in the gap. The coil unit according to claim 6.

8. Each of the plurality of coil arrangement regions, in a plan view, A first arrangement region formed on the center side of the second heating region; a second arrangement region disposed outside the first arrangement region; having the first arrangement region is defined, in a plan view, by the two adjacent boundary lines and an intermediate line connecting the two adjacent boundary lines between a center of the second heating region and the outer circumferential line; the second arrangement region is defined by the two adjacent boundary lines, the outer circumferential line, and the intermediate line in a plan view, Each of the plurality of coil pieces is a first coil wire that is arranged in the first arrangement region and arranged along the two adjacent boundary lines and the intermediate line in a plan view; a second coil wire that is arranged in the second arrangement region and that is arranged along the two adjacent boundary lines, the outer circumferential line, and the intermediate line in a plan view; having The second coil wire has the first coil wire portion and the second coil wire portion. The coil unit according to any one of claims 1 to 3.

9. The first arrangement region has a substantially triangular shape in a plan view, The second arrangement region has a substantially trapezoidal shape in a plan view. The coil unit according to claim 8.

10. The plurality of boundary lines of the second heating region are straight lines, The coil wire of the second heating region is arranged along the two adjacent boundary lines and the outer circumferential line connecting the two boundary lines in a plan view. The coil unit according to any one of claims 1 to 9.

11. The plurality of coil arrangement regions of the second heating region have substantially the same shape in a plan view, The coil pieces in the second heating region have substantially the same shape in a plan view. The coil unit according to any one of claims 1 to 10.

12. The first heating region has a plurality of coil arrangement regions defined by a plurality of boundary lines extending radially from a center of the first heating region toward an outer periphery in a plan view and an outer periphery line defining the outer periphery of the first heating region, the coil arranged in the first heating region has a plurality of coil pieces arranged in the plurality of coil arrangement regions, Each of the coil pieces in the first heating region has a coil wire that is arranged along two adjacent boundary lines among the boundary lines that define the coil arrangement regions in a plan view. The coil unit according to any one of claims 1 to 11.

13. The plurality of boundary lines of the first heating region are straight lines, The coil wire of the first heating region is arranged along the two adjacent boundary lines and the outer circumferential line connecting the two boundary lines in a plan view. The coil unit according to claim 12.

14. The plurality of coil arrangement regions of the first heating region have substantially the same shape in a plan view, The coil pieces in the first heating region have substantially the same shape in a plan view. The coil unit according to claim 12 or 13.

15. The coil pieces of the first heating region have substantially the same shape as the coil pieces of the second heating region. The coil unit according to any one of claims 12 to 14.

16. The first heating region has a circular shape in a plan view. A coil unit according to any one of claims 1 to 15.

17. a third heating region having a sector shape is provided around the second heating region in a direction in which the first heating region and the second heating region are arranged; The third heating region has a plurality of coil arrangement regions defined by a plurality of boundary lines extending radially from a center of the third heating region toward an outer periphery and an outer periphery line defining an outer periphery of an arc portion of the third heating region in a plan view, the coil arranged in the third heating region has a plurality of coil pieces arranged in the plurality of coil arrangement regions, respectively, in a plan view; Each of the coil pieces in the third heating region has a coil wire arranged along two adjacent boundary lines among the boundary lines that define the coil arrangement regions in a plan view. A coil unit according to any one of claims 1 to 16.

18. The plurality of coil arrangement regions of the third heating region have substantially the same shape in a plan view, The coil pieces of the third heating region have substantially the same shape in a plan view. The coil unit according to claim 17.

19. The coil pieces of the third heating region have substantially the same shape as the coil pieces of the second heating region. A coil unit according to claim 17 or 18.

20. An induction heating cooker comprising one or more coil units according to any one of claims 1 to 19.

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