Coil unit and induction heating cooker

Abstract

To efficiently heat an object to be heated.SOLUTION: A coil unit according to the present disclosure is arranged below a top plate of an induction heating cooker, and the coil unit comprises six coil pieces arranged in a heating area in plan view where an object to be heated can alone be heated. The heating area has, in plan view, six coil arrangement areas defined by six boundary lines extending radially from the center toward the outer periphery of the heating area and an outer peripheral line defining the outer periphery of the heating area. The six coil pieces are arranged in the six coil arrangement areas in plan view. Each of the six coil pieces has, in plan view, a coil wire arranged along adjacent two boundary lines of the six boundary lines and the outer peripheral line connecting the adjacent two boundary lines. Each of the six coil pieces has a fan-shape or a triangular contour.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. The multiple heating coils are divided into a first heating coil arranged close to a temperature detection unit and a second heating coil arranged farther from the temperature detection unit than the first heating coil. The control unit controls the total amount of power input to the second heating coil during the preheating operation to be greater than the total amount of power input to the first heating coil during the period from when an instruction for preheating operation to preheat an object to be heated to a preset temperature is issued from the operation unit to when preheating is completed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-69670 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 coil unit disposed under a top plate of an induction heating cooker, The heater includes six coil pieces arranged in a heating region capable of independently heating an object to be heated in a plan view; The heating region has six coil arrangement regions defined by six boundary lines extending radially from the center of the heating region toward the outer periphery in a plan view and an outer periphery line defining the outer periphery of the heating region; the six coil pieces are arranged within the six coil arrangement regions in a plan view, each of the six coil pieces has a coil wire that is arranged along two adjacent boundary lines among the six boundary lines and an outer circumferential line that connects the two adjacent boundary lines in a plan view; The outer shape of each of the six coil pieces is a sector or a triangle.

[0008] An induction heating cooker according to one aspect of the present disclosure includes: A top plate and A coil unit disposed below the top plate; Equipped with The coil unit includes: A coil unit disposed under a top plate of an induction heating cooker, The heater includes six coil pieces arranged in a heating region capable of independently heating an object to be heated in a plan view; The heating region has six coil arrangement regions defined by six boundary lines extending radially from the center of the heating region toward the outer periphery in a plan view and an outer periphery line defining the outer periphery of the heating region; the six coil pieces are arranged within the six coil arrangement regions in a plan view, each of the six coil pieces has a coil wire that is arranged along two adjacent boundary lines among the six boundary lines and an outer circumferential line that connects the two adjacent boundary lines in a plan view; The outer shape of each of the six coil pieces is a sector or a triangle. 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] 11 is a plan view of an example of a coil unit according to a second embodiment of the present disclosure. FIG. [Diagram 5] 5 is a schematic enlarged view of a coil piece constituting the coil unit of FIG. 4. [Figure 6] FIG. 11 is a plan view of another example of the coil unit according to the second embodiment. [Figure 7] FIG. 11 is a plan view of an example of a coil unit according to a third embodiment of the present disclosure. [Figure 8] 8 is a schematic enlarged view of a coil piece that constitutes the coil unit of FIG. 7. [Figure 9] FIG. 13 is a plan view of another example of the coil unit according to the third embodiment. [Figure 10] FIG. 11 is a plan view of an example of a coil unit according to a fourth embodiment of the present disclosure. [Figure 11] 11 is a schematic enlarged view of a coil piece constituting the coil unit of FIG. 10. [Figure 12] FIG. 13 is a plan view of another example of the coil unit according to the fourth embodiment of the present disclosure. [Figure 13] FIG. 13 is a plan view of an example of a coil unit according to a fifth embodiment of the present disclosure. [Figure 14] 14 is a schematic enlarged view of a coil piece constituting the coil unit of FIG. 13. [Figure 15]FIG. 13 is a plan view of a coil unit according to a first modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Background to this disclosure) The induction heating cooker described in Patent Document 1 includes a ring-shaped first heating coil arranged in the center of the heating area in a plan view, and an annular second heating coil arranged outside the first heating coil. The induction heating area described in Patent Document 1 heats the center of the heating area with the first heating coil, and heats the outer periphery of the heating area with the second heating coil. For example, the induction heating area described in Patent Document 1 heats with the first heating coil when it is desired to concentrate heating on the center of the heating area, and heats with both the first heating coil and the second heating coil when it is desired to heat the entire heating area.

[0012] However, in recent years, there is a demand for more efficient heating in induction heating cookers. For example, in the induction heating cooker described in Patent Document 1, uneven gaps are formed between adjacent heating coils at the center and outer periphery of the heating area in a plan view. Even with such a structure, it is required to suppress uneven heating.

[0013] Therefore, after careful consideration, the inventors discovered a configuration in which the heating area is divided into multiple coil arrangement areas that are arranged radially adjacent to each other when viewed in a plane, and multiple coil pieces are arranged along lines that define the multiple coil arrangement areas, resulting in the following invention.

[0014] A coil unit of a first aspect of the present disclosure comprises a plurality of coil pieces arranged in a heating area that heats an object to be heated in a planar view, the heating area having a plurality of coil arrangement areas defined by a plurality of boundary lines extending radially from the center of the heating area toward the outer periphery in a planar view and an outer periphery line that defines the outer periphery of the heating area, the plurality of coil pieces being arranged within the plurality of coil arrangement areas in a planar view, and each of the plurality of coil pieces having a coil wire arranged along, in a planar view, two adjacent boundary lines among the plurality of boundary lines and an outer periphery line connecting the two adjacent boundary lines.

[0015] In a coil unit of a second aspect of the present disclosure, the coil wire may have a first coil wire portion arranged along the two adjacent boundary lines and the outer circumferential line in a planar view, and a second coil wire portion arranged inside the first coil wire portion in a planar view.

[0016] In the coil unit according to the third aspect of the present disclosure, the second coil wire portion may be disposed along an inner side of the first coil wire portion in a plan view.

[0017] In the coil unit according to the fourth aspect of the present disclosure, a line width of the second coil wire portion may be larger than a line width of the first coil wire portion in a plan view.

[0018] In the coil unit of the fifth aspect of the present disclosure, a first gap may be formed between the first coil wire portion and the second coil wire portion on the center side of the heating region in a plan view.

[0019] The coil unit of a sixth aspect of the present disclosure may further include a ferrite disposed in the first gap, and the ferrite may be disposed across two adjacent coil pieces of the plurality of coil pieces.

[0020] In the coil unit according to a seventh aspect of the present disclosure, the coil wire may further include a third coil wire portion that is disposed inside the second coil wire portion in a plan view.

[0021] In the coil unit according to an eighth aspect of the present disclosure, the third coil wire portion may be disposed along an inner side of the second coil wire portion in a plan view.

[0022] In the coil unit of a ninth aspect of the present disclosure, the third coil wire portion may be disposed at the center of an inner region surrounded by the second coil wire portion in a plan view.

[0023] In the coil unit of the tenth aspect of the present disclosure, when viewed in a plan view, a second gap is formed between the second coil wire portion and the third coil wire portion on the central side of the heating area, and the coil unit may further include a temperature sensor arranged in the second gap.

[0024] In the coil unit of an eleventh aspect of the present disclosure, the second coil wire portion may be disposed so as to be spaced farther from the first coil wire portion from the center of the heating region toward the outer periphery in a plan view.

[0025] In a coil unit of a twelfth aspect of the present disclosure, the coil wire further has a third coil wire portion arranged inside the second coil wire portion in a planar view, the third coil wire portion being arranged outer than the center of the heating area in a planar view, and a third gap is formed between the second coil wire portion and the third coil wire portion on the center side of the heating area in a planar view, and the coil unit may further include a temperature sensor arranged in the third gap.

[0026] In a coil unit of a thirteenth aspect of the present disclosure, each of the multiple coil arrangement regions has, in a planar view, a first arrangement region formed on the center side of the heating region and a second arrangement region arranged outside the first arrangement region, the first arrangement region being defined, in a planar view, by the two adjacent boundary lines and an intermediate line connecting the two adjacent boundary lines between the center of the heating region and an outer circumferential line, the second arrangement region being defined, in a planar view, by the two adjacent boundary lines, the outer circumferential line, and the intermediate line, and each of the multiple coil pieces may have, in a planar view, a first coil wire arranged within the first arrangement region and along the two adjacent boundary lines and the intermediate line, and a second coil wire arranged in the second arrangement region and along the two adjacent boundary lines, the outer circumferential line, and the intermediate line.

[0027] In the coil unit of a fourteenth aspect of the present disclosure, the plurality of coil arrangement regions may have substantially the same shape in a planar view, and the plurality of coil pieces may have substantially the same shape in a planar view.

[0028] In the coil unit according to a fifteenth aspect of the present disclosure, the number of the plurality of coil arrangement regions may be equal to or greater than three and equal to or less than eight.

[0029] In the coil unit according to a sixteenth aspect of the present disclosure, the heating region may be circular in plan view.

[0030] An induction heating cooker of a seventeenth aspect of the present disclosure comprises a top plate and a coil unit arranged below the top plate, the coil unit comprising a plurality of coil pieces arranged in a heating area that heats an object to be heated in a planar view, the heating area having a plurality of coil arrangement areas defined by a plurality of boundary lines extending radially from the center of the heating area toward the outer periphery in a planar view and an outer periphery line that defines the outer periphery of the heating area, the plurality of coil pieces being arranged within the plurality of coil arrangement areas in a planar view, and each of the plurality of coil pieces having a coil wire arranged along two adjacent boundary lines among the plurality of boundary lines and an outer periphery line connecting the two adjacent boundary lines in a planar view.

[0031] 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.

[0032] (Embodiment 1) [Overall configuration] 1 is a schematic perspective view of an example of an induction heating cooker 1 according to a first embodiment of the present disclosure. Note that the XYZ coordinate system shown in the figure is for the purpose of aiding understanding of the invention and does not limit the invention. The X-axis direction and the Y-axis direction indicate the horizontal direction, and the Z-axis direction indicates the vertical direction.

[0033] As shown in Fig. 1, the induction heating cooker 1 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.

[0034] The induction heating cooker 1 has a top plate 2 made of, for example, heat-resistant glass on which a cooking container C is placed, and a housing 3 attached to the lower surface of the top plate 2. A plurality of coil units 4 are mounted inside the housing 3. Each of the plurality of coil units 4 is disposed below the top plate 2, and induction heats the cooking container C placed on the portion of the top plate 2 that faces it. That is, each of the plurality of coil units 4 functions as an induction heating coil unit.

[0035] Although not shown, the induction heating cooker 1 includes a control unit that controls the coil unit 4. 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.

[0036] [Coil unit] The coil unit 4 will be described below with reference to FIGS.

[0037] 2 is a plan view of an example of the coil unit 4 according to the first embodiment of the present disclosure. As shown in FIG. 2, the coil unit 4 includes a plurality of coil pieces 10.

[0038] The multiple coil pieces 10 are arranged in a heating area S0 in a plan view that heats an object to be heated. In this specification, "plan view" means viewing from the vertical direction, i.e., the Z-axis direction. The heating area S0 is a closed area having a center C1 in a plan view, and is an area in which the multiple coil pieces 10 are arranged. In the first embodiment, the heating area S0 is formed into a circular shape in a plan view. The heating area S0 may also be an area in which a cooking container C shown on the upper surface of the top plate 2 is arranged.

[0039] In addition, the heating region S0 is not limited to being circular in plan view. For example, the heating region S0 may be rectangular, elliptical, or regular polygonal in plan view. When the heating region S0 is rectangular in plan view, the center C1 of the heating region S0 is the intersection of the diagonals. When the heating region S0 is elliptical in plan view, the center C1 of the heating region S0 is the intersection of the major axis and the minor axis. When the heating region S0 is regular polygonal in plan view, the center C1 of the heating region S0 is the center of an inscribed circle that touches all the outer sides that constitute the regular polygon.

[0040] The heating region S0 has a plurality of coil arrangement regions S1 to S6. The plurality of coil arrangement regions S1 to S6 are arranged radially and adjacently around the center C1 of the heating region S0 in a plan view. Specifically, the plurality of coil arrangement regions S1 to S6 are defined by a plurality of boundary lines L1 to L6 extending radially from the center C1 of the heating region S0 toward the outer periphery in a plan view, and an outer periphery line L10 that defines the outer periphery of the heating region S0. The plurality of coil arrangement regions S1 to S6 are formed in a fan shape in a plan view.

[0041] In the first embodiment, the boundary lines L1 to L6 are arranged radially at equal intervals around the center C1 of the heating region S0 in a plan view. The boundary lines L1 to L6 are straight lines extending from the center C1 of the heating region S0 toward the outer periphery in a plan view. The angles formed by two adjacent boundary lines among the boundary lines L1 to L6 are substantially the same. As a result, the coil arrangement regions S1 to S6 have substantially the same shape and substantially the same size in a plan view. In this specification, "substantially" means within an error of 10%, and preferably within an error of 5%.

[0042] In the first embodiment, the boundary lines include six boundary lines L1 to L6, and the angle between two adjacent boundary lines is 60 degrees. This divides the heating region S0 into six coil arrangement regions S1 to S6 that have substantially the same shape and size in a plan view.

[0043] The multiple coil pieces 10 are arranged in multiple coil arrangement regions S1 to S6 in a plan view. Specifically, one coil piece 10 is arranged in one coil arrangement region. As a result, the multiple coil pieces 10 are arranged radially and adjacently in the heating region S0 in a plan view.

[0044] Each of the multiple coil pieces 10 has a coil wire 11 wound and arranged in each of the multiple coil arrangement regions S1 to S6. In a plan view, the coil wire 11 is arranged along two adjacent boundary lines among the multiple boundary lines L1 to L6 and an outer circumferential line L10 connecting the two adjacent boundary lines. In the coil arrangement regions S1 to S6, the coil wire 11 is arranged along the lines L1 to L6, L10 that define the coil arrangement regions S1 to S6, and is arranged wound inward.

[0045] In the first embodiment, the multiple coil pieces 10 have substantially the same shape and substantially the same size in a plan view.

[0046] Fig. 3 is a schematic enlarged view of a coil piece 10 constituting the coil unit 4 of Fig. 2. Fig. 3 shows the coil piece 10 arranged in coil arrangement region S1. Furthermore, coil arrangement regions S2 to S6 have the same configuration as coil arrangement region S1, so their description will be omitted.

[0047] 3, the coil piece 10 arranged in the coil arrangement region S1 has a coil wire 11 arranged along two adjacent boundary lines L1, L2 and an outer circumferential line L10 connecting the two adjacent boundary lines L1, L2 in a plan view. The coil wire 11 is made of a conductive material.

[0048] The coil wire 11 is arranged so as to wind around the boundary lines L1, L2 and the outer circumferential line L10 in the coil arrangement region S1 in a plan view. The coil wire 11 is arranged in a frame shape in a plan view. In the first embodiment, since the coil arrangement region S1 is formed in a sector shape in a plan view, the outer shape of the coil wire 11 is also formed in a sector shape in a plan view.

[0049] In the first embodiment, the coil wire 11 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 a wire section in which a plurality of metal wires are twisted and bundled, and then wound around a plurality of turns. For example, the wire section is formed by twisting and bundling about 20 copper wires having a diameter of 0.2 mm, and winding the bundled wire around 10 turns. 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 or more and 0.5 mm or less. The material of the metal wire is not limited to copper, and may be, for example, aluminum or a clad material of copper and aluminum. 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 turns of the wire portion is not limited to 10 turns and may be set as appropriate. For example, the number of turns may be selected as appropriate within a range of 5 to 20.

[0050] The first coil wire portion 20 is arranged along two adjacent boundary lines L1, L2 and an outer circumferential line L10 in a plan view. The first coil wire portion 20 is a portion of the coil wire 11 that is arranged on the outermost side of the coil piece 10 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.

[0051] 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 boundary line L1. The straight portion 22 is a straight coil portion arranged along the boundary line L2. The curved portion 23 is a curved coil portion arranged along the 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 on the center C1 side of the heating area S0 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 on the outer circumferential line L10 side of the heating area S0 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 outer circumferential line L10 side of the heating area S0 in a plan view. The connection portions 24, 25, and 26 have, for example, a U-shaped curved shape.

[0052] In this specification, "arranged along boundary lines L1, L2 or circumferential line L10" means, unless otherwise specified, that there are no other parts arranged to block the gap between the boundary lines L1, L2 or circumferential line L10, and that the parts are arranged to extend in approximately the same direction as the boundary lines L1, L2 or circumferential line L10.

[0053] The second coil wire portion 30 is disposed inside the first coil wire portion 20 in a plan view. In the first embodiment, 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.

[0054] 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 on the center C1 side of the heating area S0 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 on the outer peripheral line L10 side of the heating area S0 in a plan view. The connection 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 on the outer peripheral line L10 side of the heating area S0 in a plan view. The connection portions 34, 35, and 36 are, for example, curved in a U-shape.

[0055] The third coil wire portion 40 is disposed inside the second coil wire portion 30 in a plan view. In the first embodiment, 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 external shape of the third coil wire portion 40 is formed in a sector shape in a plan view.

[0056] 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 on the center C1 side of the heating area S0 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 on the outer peripheral line L10 side of the heating area S0 in a plan view. The connection 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 on the outer peripheral line L10 side of the heating area S0 in a plan view. The connection portions 44, 45, and 46 are, for example, curved in a U-shape.

[0057] In the first embodiment, the straight line portions 21, 31, and 41 are disposed substantially parallel to one another. The straight line portions 22, 32, and are disposed substantially parallel to one another. The curved line portions 23, 33, and 43 are disposed opposite to one another.

[0058] [effect] The coil unit 4 according to the first embodiment can provide the following effects.

[0059] The coil unit 4 according to the first embodiment of the present disclosure includes a plurality of coil pieces 10 arranged in a heating region S0 that heats an object to be heated in a plan view. The heating region S0 has a plurality of coil arrangement regions S1-S6 defined by a plurality of boundary lines L1-L6 extending radially from a center C1 of the heating region S0 toward the outer periphery in a plan view and an outer periphery line L10 that defines the outer periphery of the heating region S0. The plurality of coil pieces 10 are arranged in the plurality of coil arrangement regions S1-S6 in a plan view. Each of the plurality of coil pieces 10 has a coil wire 11 arranged along two adjacent boundary lines among the plurality of boundary lines L1-L6 and an outer periphery line L10 that connects the two adjacent boundary lines in a plan view.

[0060] With this configuration, the object to be heated can be heated efficiently. Specifically, the heating area S0 is divided into a plurality of coil arrangement areas S1 to S6 by a plurality of boundary lines L1 to L6 and an outer circumferential line L10. In each of the plurality of coil arrangement areas S1 to S6, the coil wire 11 constituting the coil piece 10 is arranged along two adjacent boundary lines and an outer circumferential line L10 connecting the two adjacent boundary lines. As a result, the coil wire 11 of the coil piece 10 is arranged from the center C1 of the heating area S0 toward the outer periphery in a plan view, so that uneven heating can be reduced. Also, the gap between the plurality of coil pieces 10 can be reduced, and the variation in the gap can be reduced.

[0061] In addition, by individually controlling the heating of the multiple coil pieces 10, it is possible to, for example, concentrate heating on a portion of the heating area S0 in the up, down, left, and right directions in a plan view. In addition, since the gaps between the multiple coil pieces 10 can be reduced, the heating efficiency of the coil unit 4 can be improved while achieving miniaturization.

[0062] The coil wire 11 has a first coil wire portion 20 arranged along two adjacent boundary lines L1, L2 and an outer circumferential line L10 in a planar view, and a second coil wire portion 30 arranged in a planar view inside the first coil wire portion 20. With this configuration, it is possible to increase the area of ​​the coil wire 11 arranged in the heating region S0 in a planar view, and to increase the area heated by the coil piece 10 in the heating region S0.

[0063] In a plan view, the second coil wire portion 30 is disposed along the inside of the first coil wire portion 20. With this configuration, the magnetic flux of the coil wire 11 can be strengthened, and heating can be performed efficiently.

[0064] The coil wire 11 further has a third coil wire portion 40 that is disposed inside the second coil wire portion 30 in a plan view. With this configuration, the area of ​​the coil wire 11 that is disposed in the heating region S0 in a plan view can be further increased, and the area that is heated by the coil piece 10 in the heating region S0 can be further increased.

[0065] The third coil wire portion 40 is disposed along the inside of the second coil wire portion 30 in a plan view. With this configuration, the magnetic flux of the coil wire 11 can be further strengthened, and heating can be performed more efficiently.

[0066] The multiple coil arrangement regions S1 to S6 have substantially the same shape, and the multiple coil pieces 10 have substantially the same shape. With this configuration, the multiple coil pieces 10 can be evenly arranged in the heating region S0 in a plan view. Also, the intervals between the multiple coil pieces 10 can be made smaller. This can further reduce uneven heating and enable more efficient heating. Also, the coil unit 4 can be manufactured more easily and at a reduced manufacturing cost.

[0067] The heating area S0 is circular in plan view. With this configuration, heating can be performed more efficiently.

[0068] The induction heating cooker 1 according to the first embodiment of the present disclosure includes a top plate 2 and a coil unit 4 disposed below the top plate 2. With such a configuration, it is possible to achieve the same effects as those of the coil unit 4 described above.

[0069] In the first embodiment, an example in which the number of the coil arrangement regions S1 to S6 is six has been described, but the present invention is not limited to this. Also, an example in which the number of the coil pieces 10 is six has been described, but the present invention is not limited to this. The number of the coil arrangement regions may be three or more and eight or less. The number of the coil pieces 10 may be three or more and eight or less. With this configuration, it is possible to improve the heating efficiency while reducing the manufacturing cost.

[0070] In the first embodiment, the coil arrangement regions S1 to S6 have substantially the same shape and size, but the present invention is not limited to this. For example, the coil arrangement regions S1 to S6 may have different shapes and / or different sizes.

[0071] In the first embodiment, the coil pieces 10 have substantially the same shape and substantially the same size, but the present invention is not limited to this. For example, the coil pieces 10 may have different shapes and / or different sizes.

[0072] In addition, in the first 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 heating efficiency of the entire heating area S0 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 becomes difficult to bend it sharply along the shape of the coil arrangement areas S1 to S6. Therefore, it is easier to manufacture by increasing the thickness rather than the width of the coil wire portion.

[0073] In the first embodiment, the boundary lines L1 to L6 are straight lines extending from the center C1 of the heating region S0 toward the periphery in a plan view, but the present invention is not limited to this. For example, the boundary lines L1 to L6 may be curved lines extending from the center C1 of the heating region S0 toward the periphery in a plan view.

[0074] In the first embodiment, an example has been described in which the coil wire 11 has the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40, but this is not limiting. For example, the coil wire 11 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. The coil wire 11 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.

[0075] In the first embodiment, an example in which the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 are integrally formed has been described, 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.

[0076] In the first embodiment, the coil unit 4 is applied to the induction heating cooker 1 by way of example, but is not limited thereto. The coil unit 4 may be applied to a device other than the induction heating cooker 1.

[0077] (Embodiment 2) Second Embodiment A coil unit according to a second embodiment of the present invention will be described.

[0078] 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.

[0079] Fig. 4 is a plan view of an example of a coil unit 4A according to a second embodiment of the present disclosure, and Fig. 5 is a schematic enlarged view of a coil piece 10A constituting the coil unit 4A of Fig. 4.

[0080] The second embodiment differs from the first embodiment in that the coil wire 11A is composed of a first coil wire portion 20 and a second coil wire portion 30A, and in that the line width of the second coil wire portion 30A is larger than the line width of the first coil wire portion 20 in a plan view.

[0081] As shown in FIGS. 4 and 5, the coil wire 11A constituting the coil piece 10A has a first coil wire portion 20 and a second coil wire portion 30A.

[0082] 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. For example, the line width W2 of the second coil wire portion 30A is 1.5 times or more and 3 times or less than the line width W1 of the first coil wire portion 20. In this specification, the "line width" means the thickness of the line of the coil wire 11A in plan view. Note that each of the first coil wire portion 20 and the second coil wire portion 30A in Figs. 4 and 5 is formed by winding a bundle of 20 or more metal wires having a diameter of 0.2 mm, which are twisted together, as in the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 in Fig. 3. By changing the number of turns, the line width W2 and the line width W1 can be made different. For example, in this embodiment, the number of turns of the first coil wire portion 20 is 12 turns, and the number of turns of the second coil wire portion 30A is 24 turns.

[0083] 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.

[0084] 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 heating region S0. 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. Therefore, in plan view, a first gap SP1 is formed between the connection portion 24 arranged on the center C1 side of the heating region S0 and the connection portion 34A. In plan view, the first gap SP1 is large enough to accommodate electronic components such as ferrite and a temperature sensor.

[0085] Fig. 6 is a plan view of another example of the coil unit 4A according to embodiment 2. As shown in Fig. 6, ferrite 50 may be disposed in the first gap SP1. Furthermore, the multiple ferrite pieces 50 may be disposed across two adjacent coil pieces 10A among the multiple coil pieces 10A.

[0086] For example, the ferrite 50 may have a plate shape. Alternatively, the ferrite 50 may be a plate-shaped member having one end and the other end, and may have a shape having protrusions protruding from the one end and the other end in the thickness direction of the plate-shaped member. For example, the ferrite 50 may be L-shaped with one end protruding toward the positive direction of the Z axis. Or the ferrite 50 may be U-shaped with both ends protruding toward the positive direction of the Z axis. This increases the heating efficiency in the area where the ferrite 50 is arranged, and the number of turns of the coil wire portion can be reduced.

[0087] [effect] According to the coil unit 4A according to the second embodiment, the following effects can be achieved.

[0088] In coil unit 4A according to embodiment 2 of the present disclosure, line width W2 of second coil wire portion 30A is larger in plan view than line width W1 of first coil wire portion 20. With this configuration, coil piece 10 can be manufactured more easily than in embodiment 1, and manufacturing costs can be reduced.

[0089] In a plan view, a first 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 heating region S0. With this configuration, electronic components such as ferrite or a temperature sensor can be disposed in the first gap SP1.

[0090] The coil unit 4A further includes ferrite 50 disposed in the first gap SP1. The ferrite 50 is disposed across two adjacent coil pieces 10A among the multiple coil pieces 10A. With this configuration, the magnetic flux can be concentrated on the center C1 side of the heating region S0 in a plan view, thereby increasing the heating output. Therefore, the heating can be concentrated near the center of the heating region S0.

[0091] In the second embodiment, in the example shown in Fig. 6, the ferrite 50 is disposed in the first gaps SP1 of all the coil pieces 10, but the present invention is not limited to this. For example, the ferrite 50 may be disposed in any of the multiple coil pieces 10.

[0092] In the second embodiment, the first coil wire portion 20 and the second coil wire portion 30A may also be made different in thickness. This improves heating efficiency and simplifies the manufacturing process. Similarly, in the following third to fifth embodiments, the thicknesses of the coil wire portions may also be made different.

[0093] (Embodiment 3) A coil unit according to a third embodiment of the present invention will be described.

[0094] 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.

[0095] Fig. 7 is a plan view of an example of a coil unit 4B according to a third embodiment of the present disclosure, and Fig. 8 is a schematic enlarged view of a coil piece 10B constituting the coil unit 4B of Fig. 7.

[0096] The third embodiment differs from the first embodiment in that the third coil wire portion 40B is disposed at the center of the inner region surrounded by the second coil wire portion 30 in a plan view.

[0097] As shown in FIGS. 7 and 8, a coil wire 11B constituting a coil piece 10B has a first coil wire portion 20, a second coil wire portion 30, and a third coil wire portion 40B.

[0098] In plan view, the third coil wire portion 40B is not arranged along the inside of the second coil wire portion 30, but is arranged at the center of the inner region surrounded by the second coil wire portion 30. In the third embodiment, the third coil wire portion 40B is formed in a substantially triangular frame shape in plan view.

[0099] 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.

[0100] 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.

[0101] In a plan view, straight portion 41B, 42B, 43B of third coil wire portion 40B extend in a direction intersecting straight portion 31, 32 and curved portion 33 of second coil wire portion 30, respectively. Specifically, straight portion 41B extends in a direction away from straight portion 31 toward the outer periphery of heated region S0 in a plan view. Straight portion 42B extends in a direction away from straight portion 32 toward the outer periphery of heated region S0 in a plan view. Straight portion 43B is located on the center C1 side of heated region S0 in a plan view, and extends in a direction intersecting straight portions 31 and 32.

[0102] In the third embodiment, the straight line portions 41B, 42B, 43B of the third coil wire portion 40B are evenly arranged in the inner region surrounded by the second coil wire portion 30 in a plan view. Here, "evenly arranged" means that the straight line portions 41B, 42B, 43B of the third coil wire portion 40B are arranged such that the inner region surrounded by the second coil wire portion 30 is divided into a plurality of equal regions in a plan view.

[0103] In plan view, the third coil wire portion 40B is not disposed along the inside of the second coil wire portion 30, and therefore a second 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 heating region S0. In plan view, the second gap SP2 is large enough to accommodate electronic components such as ferrite or a temperature sensor.

[0104] Fig. 9 is a plan view of another example of the coil unit 4B of embodiment 3. As shown in Fig. 9, a temperature sensor 51 may be arranged in the second gap SP2 of the coil piece 10B arranged in the coil arrangement region S1 in the plan view.

[0105] [effect] According to the coil unit 4B according to the third embodiment, the following effects can be achieved.

[0106] In the coil unit 4B according to the third embodiment of the present disclosure, the third coil wire portion 40B is disposed at the center of the inner region surrounded by the second coil wire portion 30 in a plan view. With this configuration, it is possible to reduce the region in the heating region S0 in a plan view where the coil wire 11B is not disposed. This reduces uneven heating and enables efficient heating.

[0107] In plan view, a second 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 heating region S0, and the coil unit 4B further includes a temperature sensor 51 disposed in the second gap SP2. By disposing the temperature sensor 51 in the second gap SP2 in this way, it is possible to detect the temperature of a heating object disposed on the center side of the heating region S0 in plan view. Furthermore, by disposing the temperature sensor 51 in the second gap SP2 between the second coil wire portion 30 and the third coil wire portion 40B, it is possible to dispose the temperature sensor 51 closer to the top plate 2. This can improve the detection accuracy of the temperature sensor 51.

[0108] In addition, in a plan view, the heating temperature tends to be high near the center of the heating region S0 because multiple coil pieces 10 are densely arranged near the center. Therefore, by disposing the temperature sensor 51 in the second gap SP2, it is possible to measure the temperature at the position where the heating temperature is highest.

[0109] 9, the temperature sensor 51 is arranged only in the second gaps SP2 of the coil pieces 10B arranged in the coil arrangement region S1, but the present invention is not limited to this. For example, the temperature sensor 51 may be arranged in the second gaps SP2 of all the coil pieces 10B.

[0110] (Embodiment 4) A coil unit according to a fourth embodiment of the present invention will be described.

[0111] In the fourth embodiment, differences from the first embodiment will be mainly described. In the fourth embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the fourth embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0112] Fig. 10 is a plan view of an example of a coil unit 4C according to a fourth embodiment of the present disclosure, and Fig. 11 is a schematic enlarged view of a coil piece 10C constituting the coil unit 4C of Fig. 10.

[0113] The fourth embodiment differs from the first embodiment in that the second coil wire portion 30C is disposed so as to become increasingly farther away from the first coil wire portion 20 from the center C1 of the heating region S0 toward the outer periphery in plan view.

[0114] As shown in FIGS. 10 and 11, a coil wire 11C constituting a coil piece 10C has a first coil wire portion 20, a second coil wire portion 30C, and a third coil wire portion 40C.

[0115] The second coil wire portion 30C is disposed so as to become more distant from the first coil wire portion 20 as it moves from the center C1 of the heating region S0 toward the outer periphery in a plan view. The second coil wire portion 30C is formed in a substantially triangular frame shape in a plan view.

[0116] 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.

[0117] 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 the center C1 of heating region S0 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 the center C1 of heating region S0 toward the outer periphery.

[0118] 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 the fourth embodiment, in plan view, the third coil wire portion 40C is formed in a substantially egg-shaped frame shape.

[0119] The third coil wire portion 40C is disposed on the outer periphery side of the center C1 of the heating region S0 in a plan view. This forms a third gap SP3 between the second coil wire portion 30C and the third coil wire portion 40C on the center C1 side of the heating region in a plan view. In a plan view, the third gap SP3 is large enough to accommodate electronic components such as ferrite or a temperature sensor.

[0120] Fig. 12 is a plan view of another example of the coil unit 4C of embodiment 4. As shown in Fig. 12, in the plan view, a temperature sensor 52 may be arranged in the third gap SP3 of the coil piece 10C arranged in each of the multiple coil arrangement regions S1 to S6. In the example shown in Fig. 12, the multiple temperature sensors 52 are arranged on concentric circles centered on the center C1 of the heating region S0.

[0121] [effect] According to the coil unit 4C according to the fourth embodiment, the following effects can be achieved.

[0122] In the coil unit 4C according to the fourth embodiment of the present disclosure, the second coil wire portion 30C is disposed so as to become farther away from the first coil wire portion 20 as it moves from the center C1 of the heating region S0 to the outer periphery in a plan view. With this configuration, the coil wire 11C is densely packed near the center of the heating region S0 in a plan view, and is also dispersedly disposed from the center C1 of the heating region S0 to the outer periphery. In this way, the magnetic flux is concentrated near the center of the heating region S0, and the magnetic flux can be generated evenly from the center C1 of the heating region S0 to the outer periphery.

[0123] In the fourth embodiment, in a plan view, a plurality of coil pieces 10C are arranged radially and adjacently around the center C1 of the heating region S0, which allows magnetic flux to be concentrated near the center of the heating region S0 and to be generated evenly from the center C1 of the heating region S0 toward the outer periphery.

[0124] The third coil wire portion 40C is disposed on the outer periphery side of the center C1 of the heating region S0 in a plan view. A third gap SP3 between the second coil wire portion 30C and the third coil wire portion 40C is formed on the center C1 side of the heating region S in a plan view, and the coil unit 4C further includes a temperature sensor 52 disposed in the third gap SP3. In this manner, by disposing the temperature sensor 52 in the third gap SP3, it is possible to detect the temperature of the heating object disposed on the central side of the heating region S0 in a plan view. In addition, by disposing the temperature sensor 52 in the third gap SP3 between the second coil wire portion 30C and the third coil wire portion 40C, it is possible to dispose the temperature sensor 52 closer to the top plate 2. This improves the detection accuracy of the temperature sensor 52.

[0125] In the fourth embodiment, multiple temperature sensors 52 are arranged on a concentric circle centered on the center C1 of the heating area S0. With this configuration, it is possible to determine the position of the object T to be heated in the cooking container C, which is the object to be heated, based on the temperature results measured by the multiple temperature sensors 52. This allows efficient heating according to the object T to be heated in the cooking container C.

[0126] In the fourth embodiment, in the example shown in Fig. 12, the temperature sensor 52 is disposed in each of the multiple coil pieces 10C, but the present invention is not limited to this. For example, the temperature sensor 52 may be disposed in any of the multiple coil pieces 10C.

[0127] (Embodiment 5) A coil unit according to a fifth embodiment of the present invention will be described.

[0128] In the fifth embodiment, differences from the first embodiment will be mainly described. In the fifth embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the fifth embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0129] Fig. 13 is a plan view of an example of a coil unit 4D according to a fifth embodiment of the present disclosure, and Fig. 14 is a schematic enlarged view of a coil piece 10D constituting the coil unit 4D of Fig. 13.

[0130] The fourth embodiment differs from the first embodiment in that each of the multiple coil arrangement regions S1 to S6 has a first arrangement region S11 to S61 and a second arrangement region S12 to S62, and each of the multiple coil pieces 10D has a first coil wire 11DA and a second coil wire 11DB.

[0131] 13, each of the multiple coil arrangement regions S1 to S6 has first arrangement regions S11 to S61 and second arrangement regions S12 to S62. Each of the multiple coil pieces 10D has a first coil wire 11DA arranged in the first arrangement region S11 to S61 and a second coil wire 11DB arranged in the second arrangement region S12 to S62 in a plan view.

[0132] 14, the following description focuses on the coil arrangement region S1 and the coil piece 10D arranged within the coil arrangement region S1. In the fifth embodiment, the coil arrangement regions S2 to S6 are similar to the coil arrangement region S1. Moreover, the coil piece 10D arranged in the coil arrangement regions S2 to S6 has a similar configuration to the coil piece 10D arranged in the coil arrangement region S1.

[0133] As shown in Fig. 14, the coil arrangement region S1 has a first arrangement region S11 and a second arrangement region S12. The first arrangement region S11 is a region formed on the center C1 side of the heating region S0 in a plan view. The second arrangement region S12 is a region disposed outside the first arrangement region S11 in a plan view. The first arrangement region S11 and the second arrangement region S12 are separated by an intermediate line L11 that connects two adjacent boundary lines L1, L2 between the center C0 of the heating region S0 and the outer circumferential line L10 in a plan view.

[0134] Specifically, the first arrangement region S11 is defined by two adjacent boundary lines L1, L2 and an intermediate line L11 in a plan view. The second arrangement region S12 is defined by two adjacent boundary lines L1, L2, a circumferential line L10 and an intermediate line L11 in a plan view. In the fifth embodiment, the first arrangement region S11 has a substantially trapezoidal shape. The second arrangement region S12 has a substantially triangular shape.

[0135] The coil piece 10D arranged in the coil arrangement region S1 has, in plan view, a first coil wire 11DA arranged in the first arrangement region S11 and a second coil wire 11DB arranged in the second arrangement region S12.

[0136] The first coil wire 11DA is arranged along two adjacent boundary lines L1, L2 and the intermediate line L11 in the first arrangement region S11 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 boundary lines L1, L2 and the intermediate line L11 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. In the fifth embodiment, the first coil wire 11DA is formed in a substantially triangular frame shape in a plan view.

[0137] The second coil wire 11DB is arranged in the second arrangement region S12 along two adjacent boundary lines L1, L2, the outer circumferential line L10, and the intermediate line L11 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 L11 in a plan view. In the fifth embodiment, the second coil wire 11DB is formed in a substantially trapezoidal frame shape in a plan view.

[0138] In the fifth embodiment, the first coil wire 11DA and the second coil wire 11DB are not connected. Therefore, in the coil piece 10D, 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.

[0139] [effect] According to the coil unit 4D according to the fifth embodiment, the following effects can be achieved.

[0140] In the coil unit 4D according to the fifth embodiment of the present disclosure, each of the coil arrangement regions S1 to S6 has a first arrangement region S11 to S61 and a second arrangement region S12 to S62 in a plan view. The first arrangement region S11 to S61 is formed on the center C1 side of the heating region S0 in a plan view. The second arrangement region S12 to S62 is arranged outside the first arrangement region S11 to S61 in a plan view. The first arrangement region S11 to S61 is defined by two adjacent boundary lines L1 to L6 and an intermediate line L11 connecting two adjacent boundary lines L1 to L6 between the center C0 of the heating region S0 and the outer circumferential line L10 in a plan view. The second arrangement region S12 to S62 is defined by two adjacent boundary lines L1 to L6, the outer circumferential line L10, and the intermediate line L11 in a plan view. Each of the multiple coil pieces 10D has a first coil wire 11DA and a second coil wire 11DB. In a plan view, the first coil wire 11DA is arranged in a first arrangement region S11-S61 and is arranged along two adjacent boundary lines L1-L6 and a middle line L11. In a plan view, the second coil wire 11DB is arranged in a second arrangement region S12-S62 and is arranged along two adjacent boundary lines L1-L6, an outer circumferential line L10, and a middle line L11.

[0141] With this configuration, the strength of heating can be adjusted between the center side and the outer periphery side of the heating region S0 in a plan view. Specifically, in the vicinity of the center of the heating region S0 in a plan view, partial heating can be performed by the first coil wire 11DA arranged in the first arrangement region S11-S61. In addition, in the vicinity of the outer periphery of the heating region S0 in a plan view, partial heating can be performed by the second coil wire 11DB arranged in the second arrangement region S12-S62. In addition, in the entire heating region S0 in a plan view, total heating can be performed by the first coil wire 11DA and the second coil wire 11DB.

[0142] In the fifth embodiment, the number of turns of the first coil wire 11DA is "20 to 30", and the number of turns of the second coil wire 11DB is "45 (15 turns x 3 turns)", but is not limited thereto. For example, the number of turns of the first coil wire 11DA may be increased, or the number of turns of the first coil wire 11DA may be increased or decreased. By changing the number of turns, the concentration of magnetic flux may be adjusted, and the strength of heating may be adjusted. In addition, the second coil wire 11DB is wound three times, but this number of turns may be increased or decreased. By changing the number of turns, the concentration of magnetic flux may be adjusted, and the strength of heating may be adjusted.

[0143] In the fifth embodiment, the first coil wire 11DA and the second coil wire 11DB are not connected to each other, but the present invention is not limited to this. For example, the first coil wire 11DA and the second coil wire 11DB may be connected to each other.

[0144] (Modification) The following describes modified examples.

[0145] <Variation 1> Fig. 15 is a plan view of a coil unit 4E of modified example 1. As shown in Fig. 15, in the coil unit 4E of modified example 1, the heating area S0 has four coil arrangement areas S1 to S4 in a plan view. The four coil arrangement areas S1 to S4 are defined by four boundary lines L1 to L4 that extend radially from the center C1 of the heating area S0 toward the outer periphery in a plan view, and an outer periphery line L10 that defines the outer periphery of the heating area S0. In the coil unit 4E, four coil pieces 10E are disposed in the four coil arrangement areas S1 to S4, respectively.

[0146] In coil piece 10E, the line width of coil wire 11E is larger in plan view than in embodiment 1. In coil piece 10E, a fourth gap SP4 is formed between the outer coil wire portion and the inner coil wire portion on the center C1 side of heating region S0 in plan view. A temperature sensor 54 is disposed in fourth gap SP4.

[0147] Even with such a configuration, the effects of the present disclosure can be achieved.

[0148] 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]

[0149] 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]

[0150] 1 induction cooker 2 Top plate 3. Chassis 4,4A,4B,4C,4D,4E Coil unit 10, 10A, 10B, 10C, 10D, 10E Coil piece 11, 11A, 11B, 11C, 11E Coil wire 11DA First coil wire 11DB Second 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 50 Ferrite 51,52,53 Temperature Sensor 61,62,63 Straight section 64,65,66 Connections C1 center L1, L2, L3, L4, L5, L6 boundary lines L10 Outer circumference line L11 Intermediate Line S0 heating area S1, S2, S3, S4, S5, S6 coil placement area S11,S21,S31,S41,S51,S61 1st placement area S12,S22,S32,S42,S52,S62 2nd placement area SP1, SP2, SP3, SP4 gap W1, W2, W11, W12, W13 Line width

Claims

1. A coil unit disposed under a top plate of an induction heating cooker, Six coil pieces are arranged in a heating region capable of independently heating an object to be heated in a plan view; Ferrite disposed near the center of the heating region in a plan view; Equipped with The heating region has six coil arrangement regions defined by six boundary lines extending radially from the center of the heating region toward the outer periphery in a plan view and an outer periphery line defining the outer periphery of the heating region; the six coil pieces are arranged within the six coil arrangement regions in a plan view, each of the six coil pieces has a coil wire that is arranged along two adjacent boundary lines among the six boundary lines and an outer circumferential line that connects the two adjacent boundary lines in a plan view; The six coil pieces each have a sector-like or triangular outer shape; 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 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 heating region, In a plan view, the ferrite is disposed in the gap and is disposed so as to surround the center of the heating region. Coil unit.

2. In a plan view, the ferrite is arranged in a ring shape including a center of the heating region on the inside. The coil unit according to claim 1 .

3. 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 or 2.

4. The ferrite is arranged across two adjacent coil pieces among the six coil pieces. The coil unit according to any one of claims 1 to 3.

5. The six coil arrangement regions have substantially the same shape in a plan view, The six coil pieces have substantially the same shape in a plan view. The coil unit according to any one of claims 1 to 4.

6. The heating region is circular in plan view. The coil unit according to any one of claims 1 to 5.

7. The angle between the two adjacent boundary lines is 60 degrees. The coil unit according to any one of claims 1 to 6.

8. A coil unit disposed below a top plate of an induction heating cooker, Six coil pieces are arranged in a heating region capable of independently heating an object to be heated in a plan view; Ferrite disposed in the heating region in a plan view; Equipped with The heating region has six coil arrangement regions defined by six boundary lines extending radially from the center of the heating region toward the outer periphery in a plan view and an outer periphery line defining the outer periphery of the heating region; the six coil pieces are arranged within the six coil arrangement regions in a plan view, each of the six coil pieces has a coil wire that is arranged along two adjacent boundary lines among the six boundary lines and an outer circumferential line that connects the two adjacent boundary lines in a plan view; The six coil pieces each have a sector-like or triangular outer shape; The ferrite concentrates magnetic flux in a central portion of the heating region in a plan view. Coil unit.

Images