Induction heating cooker

Abstract

To provide an induction heating cooker capable of efficiently making electrical connections between an induction heating coil and a power control substrate.SOLUTION: An induction heating cooker has an induction heating coil substrate with an induction heating coil with conductors wound on an insulating substrate, and a power control substrate that supplies power to the induction heating coil, and the induction heating coil substrate has a plurality of coil connections to which lead wires connecting the induction heating coil to the power control substrate are fixed on the surface opposite to the surface where the induction heating coil is provided.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present technology relates to an induction heating cooker that performs cooking by induction heating a cooking vessel or the like placed on a top plate, and in particular to a connection between an induction heating coil and a power control board. [Background technology]

[0002] An induction heating cooker, which is a type of heating device, supplies a high-frequency current to an induction heating coil wound in a flat shape. In an induction heating cooker, an eddy current is generated in a metal cooking utensil by a high-frequency magnetic field generated in the induction heating coil by electromagnetic induction, and the cooking utensil itself is heated by Joule heat generated by the eddy current, thereby heating the food to be cooked. The induction heating coil is made by winding a Litz wire in a spiral shape and bonding it to an insulating plate (see, for example, Patent Document 1). This requires many manufacturing steps, such as bonding the induction heating coil, and strict temperature control is required. Therefore, an induction heating coil formed by winding a copper thin film wire around an insulating layer has been proposed (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 029441 [Patent Document 2] JP 2022-043697 A Summary of the Invention [Problem to be solved by the invention]

[0004] An induction heating cooker is equipped with a power control board having an inverter circuit that supplies high-frequency power. The power control board supplies high-frequency current power to the induction heating coil to generate eddy currents in the induction heating coil. For this reason, it is necessary to electrically connect the induction heating coil and the power control board.

[0005] Here, the induction heating coil in Patent Document 2 has an external connection terminal and is electrically connected to a power supply unit via the external connection terminal, but there is no particular regulation on how the connection is made. For this reason, in some cases, wiring can be time-consuming, manufacturing can take a long time, and work cannot be done efficiently.

[0006] Therefore, an object of the present invention is to provide an induction heating cooker that can efficiently establish electrical connection between an induction heating coil and a power control board. [Means for solving the problem]

[0007] The disclosed induction heating cooker comprises an induction heating coil substrate having an induction heating coil in which a conductor is wound on an insulating substrate, and a power control substrate which supplies power to the induction heating coil, and the induction heating coil substrate has a plurality of coil connection portions on the side opposite to the side on which the induction heating coil is provided, to which lead wires which connect the induction heating coil and the power control substrate are fixed. Effect of the Invention

[0008] According to the induction heating cooker of the present disclosure, the lead wire connecting the induction heating coil and the power control board is fixed at the coil connection part on the surface opposite to the surface on which the induction heating coil is provided of the board. By connecting the lead wire on the opposite surface on which the induction heating coil is not attached, contact with the induction heating coil during work can be avoided. This allows work to be performed efficiently. In addition, even after work, it is possible to prevent damage to the induction heating coil of the induction heating coil board and the back surface of the top plate opposite the surface on which the induction heating coil is provided due to contact with the lead wire, etc. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of an induction heating cooker according to a first embodiment. [Diagram 2] FIG. 2 is a diagram illustrating a configuration inside a main body case 1 of the induction heating cooker according to the first embodiment. [Diagram 3] FIG. 2 is a schematic diagram showing an internal configuration of the induction heating cooker according to the first embodiment. [Figure 4] FIG. 1 is a diagram illustrating a configuration of an induction heating unit 100 in an induction heating cooker according to a first embodiment. [Diagram 5] 1 is a diagram showing an induction heating unit 100 according to embodiment 1 as viewed from the front. [Figure 6] 1 is a diagram showing the positional relationship between an induction heating unit 100 and a top plate 10 according to the first embodiment. [Figure 7] FIG. 2 is a diagram showing an induction heating coil substrate 110 according to the first embodiment as viewed from the front side. [Figure 8] FIG. 2 is a diagram showing the induction heating coil substrate 110 according to the first embodiment as viewed from the back side. [Figure 9] FIG. 2 is a diagram for explaining the wiring relationship on the front and back surfaces of the induction heating coil substrate 110 according to the first embodiment. [Figure 10] 2 is a perspective view of the back surface side of the induction heating coil substrate 110 according to the first embodiment. FIG. [Figure 11] 1 is a perspective view of an induction heating unit 100 according to embodiment 1, as viewed from the rear side. [Figure 12] FIG. 11 is a perspective view of an induction heating coil substrate 110 according to a second embodiment, as viewed from the front side. [Figure 13] FIG. 11 is a diagram showing an induction heating coil substrate 110 according to embodiment 3 as viewed from the back side. [Figure 14] FIG. 11 is a perspective view of the back surface side of an induction heating coil substrate 110 according to embodiment 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an induction heating cooker in an embodiment will be described with reference to the drawings. Here, the present disclosure is not limited to the embodiment described below. In addition, the size relationship of each component in the following drawings, including FIG. 1, may differ from the actual one. Furthermore, in the following description, terms indicating directions are used as appropriate to facilitate understanding, but these terms are for the purpose of explanation and do not limit the present disclosure. Examples of terms indicating directions include "up", "down", "right", "left", "front" and "rear". And, the induction heating cooker includes a composite heating cooker having multiple types of heating means.

[0011] Embodiment 1 Fig. 1 is a perspective view of an induction heating cooker according to the first embodiment. As shown in Fig. 1, the induction heating cooker according to the first embodiment is a cooking cooker that uses electromagnetic induction to heat a cooking container and an object to be heated (food to be cooked), which are heating targets. A main body case 1 of the induction heating cooker houses an appliance that performs cooking. Here, with regard to the installed induction heating cooker, particularly in plate-like members such as various boards described below, the surface facing upward is the front surface, and the surface opposite the front surface is the back surface.

[0012] A top plate 10 serving as a baking tray is placed on top of the main body case 1, and a metal cooking container containing an object to be heated is placed on it. The top plate 10 is made of, for example, crystallized glass that transmits infrared rays. The top plate 10 in the first embodiment corresponds to an induction heating unit 100 described below, and has two heating areas 11 that are regions where the cooking container and the object to be heated (hereinafter, these are referred to as the object to be heated) placed on the surface of the top plate 10 can be induction heated. The boundaries of the heating areas 11 that can be heated are indicated to the user by a circular pattern printed on the back surface of the top plate 10.

[0013] The induction heating cooker in the first embodiment also has an operation display panel 30 on the upper front surface for operating and displaying various cooking condition settings and warning and abnormality information. Furthermore, the induction heating cooker in the first embodiment has a grill cooker 20 on the lower left side when viewed from the front. The grill cooker 20 is installed on the left side of the front surface of the induction heating cooker, and has a grill door 21 for opening and closing a grill chamber (not shown).

[0014] FIG. 2 is a diagram for explaining the configuration inside the main body case 1 of the induction heating cooker of the first embodiment. In FIG. 2, the top plate 10 is removed. The main body case 1 of the induction heating cooker has an air intake port 40 at the rear for taking in air from the outside to be sent to the grill chamber of the grill cooker 20. The main body case 1 also has an exhaust port 41 for discharging smoke generated from the heated object in the grill chamber together with the air. When a fan (not shown) installed in the main body case 1 is driven, the air taken in from the air intake port 40 into the main body case 1 passes through the fan and is discharged from the exhaust port 41. Here, a part of the air taken in from the air intake port 40 is also used to cool the induction heating unit 100 described later.

[0015] Moreover, the induction heating cooker in the first embodiment has two induction heating units 100. The induction heating unit 100 has an induction heating coil 112 described later, and induction heats an object to be heated placed on the heating area 11 of the top plate 10. The induction heating unit 100 will be described later. Here, the number of induction heating units 100 included in the induction heating cooker is not limited to two.

[0016] Fig. 3 is a schematic diagram showing the internal configuration of the induction heating cooker according to the first embodiment. Fig. 3 shows the internal configuration when the induction heating cooker is viewed from the front. A control box 50 is installed on the right side of the grill cooker 20 described above. The control box 50 houses a filter board 51, an inverter board 52, a control device 55, and the like. These boards have components such as semiconductor integrated circuits, resistors, capacitors, and transistors fixed thereto, and have circuits formed by wiring between the components with copper foil.

[0017] The filter board 51 is an insulating board having a filter circuit. The filter circuit converts AC power supplied from a commercial power source (not shown) via a power cord 56 into DC power and rectifies it. The inverter board 52 is an insulating power control board having an inverter circuit. The inverter circuit converts the DC power converted in the filter board 51 into AC power of a predetermined frequency based on the control of the control device 55, and supplies it to the induction heating unit 100 via the lead wire 60. A switching element 53 and a heat sink 54 are installed on the upper side of the inverter board 52. The switching element 53 is a part of the inverter circuit and is a power control element that performs DC-AC conversion by switching operation. Here, the switching element 53 is, for example, an IGBT (insulated gate bipolar transistor) capable of high-speed switching operation. The aluminum heat sink 54 dissipates heat generated by the switching operation of the switching element 53, for example. The control device 55 performs heating control in the induction heating cooker. The lead wire 60 is a wire in which a stranded wire is insulated.

[0018] The induction heating unit 100 described above is supported from the back side by a spring 131, which is an elastic body, and is pressed against the back side of the top plate 10 by the elastic force of the spring 131, and is fixed in place. As will be described later, the induction heating coil substrate 110 on which the induction heating coil 112 is formed is fixed at a position with a certain distance therebetween by a spacer 160. This makes it possible to prevent damage caused by contact between the induction heating coil substrate 110 and the top plate 10.

[0019] Fig. 4 is a diagram illustrating the configuration of the induction heating unit 100 in the induction heating cooker according to embodiment 1. Fig. 4 is an exploded view of the induction heating unit 100. The induction heating unit 100 in embodiment 1 has an induction heating coil substrate 110, ferrite 120, a holding member 130, a magnetic shielding member 140, a fixing screw 150, and a spacer 160.

[0020] The induction heating coil substrate 110 has a substrate, an induction heating coil 112, a coil connection portion 113, and a cooling hole 114. The substrate made of an insulating material is a printed circuit board on which the induction heating coil 112 is formed by printing, and is a heat-resistant substrate because it receives radiant heat from an object to be heated. The induction heating coil 112 generates a magnetic field based on the power supplied from the inverter substrate 52 via the coil connection portion 113 and the lead wire 60, and forms an eddy current by electromagnetic induction. The induction heating coil 112 and the coil connection portion 113 in the first embodiment are formed by printing a thin film conductor such as copper foil on the printed circuit board. Therefore, no jig for winding copper wire is required in the manufacturing process, and the coil shape that can be manufactured has a high degree of freedom. Here, the coil connection portion 113 in the first embodiment has a plurality of coil connection portions 113 (an outer end coil connection portion 113A and an inner end coil connection portion 113B). The coil connection portion 113 serves as a pad for wiring connection. Each coil connection portion 113 is formed at the same position on the front and back surfaces of the printed circuit board. As described later, a terminal block 170 serving as a connection part for connecting the lead wire 60 is mounted on the coil connection portion 113. The cooling hole 114 is a through hole that allows air to pass through to cool the induction heating coil substrate 110. Here, for example, when a sensor (not shown) serving as a physical quantity detection means is installed on the front surface of the printed circuit board, for example, a part of the cooling hole 114 may be provided as a sensor via. By providing the sensor via, the sensor installed on the front surface of the printed circuit board and the wiring attached to the back surface of the printed circuit board can be electrically connected to each other, and an electrical signal related to the detection of the sensor can be sent. In addition, the induction heating coil 112 and the like may be protected by applying a solder resist to the induction heating coil substrate 110. The induction heating coil substrate 110 will be described in detail later.

[0021] The ferrite 120 is a magnetic material that guides the magnetic flux generated by the magnetism in the induction heating coil 112 to the object to be heated located above the induction heating unit 100 via the top plate 10, thereby suppressing magnetic flux leakage downward from the induction heating coil 112. The ferrite 120 suppresses magnetic flux leakage, thereby preventing the control device 55 in the control box 50 from malfunctioning due to magnetism. The holding member 130 is a member that holds the ferrite 120 by sandwiching it between the induction heating coil substrate 110 and the holding member 130. The holding member 130 is fixed to the induction heating coil substrate 110 by fixing screws 150, and suppresses warping of the induction heating coil substrate 110 due to heat.

[0022] 5 is a view of the induction heating unit 100 according to the first embodiment as viewed from the front. The magnetic shielding member 140 is a plate-shaped member made of a non-magnetic metal that prevents the magnetism generated in the induction heating coil 112 from leaking outside the heating area 11. For this reason, the magnetic shielding member 140 covers the outer periphery of the induction heating unit 100, leaving the induction heating coil 112 exposed. In addition, the magnetic shielding member 140 sandwiches the holding member 130 and the induction heating coil substrate 110, suppressing warping of the induction heating coil substrate 110. Here, the magnetic shielding member 140 is not a member that necessarily needs to be attached.

[0023] The fixing screw 150 fixes the induction heating coil substrate 110, the holding member 130, and the magnetic shielding member 140. By fastening the induction heating coil substrate 110, the holding member 130, and the magnetic shielding member 140 together with the fixing screw 150, no adhesive is needed to fix the induction heating coil substrate 110 when manufacturing the induction heating unit 100, and disassembly can be easily performed. Here, the fixing screw 150 is made of a non-magnetic material.

[0024] FIG. 6 is a diagram showing the arrangement relationship between the induction heating unit 100 and the top plate 10 according to the first embodiment. The spacer 160 is an elastic member such as rubber that keeps the distance between the induction heating coil substrate 110 and the top plate 10 constant. Although not particularly limited, for example, the distance between the induction heating coil substrate 110 and the top plate 10 is about 3 mm to about 4 mm. By not bringing the induction heating coil substrate 110 and the top plate 10 into close contact with each other and leaving a certain distance between them, a gap is provided between the induction heating coil substrate 110 and the top plate 10, and the influence of heat from the heated object on the induction heating coil 112 can be suppressed. In addition, the air flowing in from the air intake 40 passes over the induction heating coil 112, thereby cooling the induction heating coil 112. Furthermore, the fixing screw 150 and other protrusions protruding from the induction heating coil substrate 110 come into contact with the back surface of the top plate 10, thereby preventing damage to the printing on the back surface. For example, when a sensor (not shown) for detecting temperature or the like is installed on the surface of the printed circuit board, the space required for installation can be secured and the distance from the top plate 10 can be stabilized, improving the accuracy of temperature detection. The terminal block 170 and the like will be described later.

[0025] 7 is a view of the induction heating coil substrate 110 according to the first embodiment as seen from the front. As described above, the induction heating coil substrate 110 has a printed circuit board, an induction heating coil 112, a coil connection portion 113, and a cooling hole 114. The induction heating coil 112 is a thin-film conductor formed by winding from the inside to the outside, with the start of the coil winding being located at a position that is approximately the center of the printed circuit board. The outer end portion, which is the end of the winding of the induction heating coil 112, is electrically connected to the outer end coil connection portion 113A. In addition, a coil via 115 is provided at the start of the coil winding.

[0026] 8 is a view of the induction heating coil substrate 110 according to the first embodiment as viewed from the back side. In the induction heating coil substrate 110 in the first embodiment, a part serving as the inner end, which is the start of winding of the induction heating coil 112, is electrically connected to the inner end coil connection part 113B on the back side. Here, the inner end coil connection part 113B is disposed on the outer periphery side of the induction heating coil substrate 110. Therefore, in the first embodiment, the inner end of the induction heating coil 112 on the front side of the induction heating coil substrate 110 and the inner end coil connection part 113B on the back side are electrically connected via the coil via 115 and the coil connection pattern line 116 of a thin-film conductor formed on the back side of the induction heating coil substrate 110.

[0027] FIG. 9 is a diagram for explaining the wiring relationship on the front and back surfaces of the induction heating coil substrate 110 according to the first embodiment. In FIG. 9, the wiring pattern on the front surface is drawn with solid lines, and the wiring pattern on the back surface is drawn with dotted lines. As shown in FIG. 9, in the induction heating coil substrate 110 according to the first embodiment, the coil connection portion 113 is located on the outer periphery side of the induction heating coil 112, and the outer end coil connection portion 113A and the inner end coil connection portion 113B are arranged side by side along the same side. By positioning the coil connection portion 113 on the outer periphery side of the induction heating coil 112, it is possible to prevent damage caused by contact of the induction heating coil 112 when performing the work of connecting the lead wire 60 to the coil connection portion 113. In addition, by arranging the outer end coil connection portion 113A and the inner end coil connection portion 113B side by side, the work of connecting the lead wire 60 can be performed efficiently.

[0028] FIG. 10 is a perspective view of the back side of the induction heating coil substrate 110 according to the first embodiment. As described above, in the induction heating coil substrate 110 according to the first embodiment, the terminal block 170 is mounted on the coil connection portion 113. At this time, the induction heating coil substrate 110 according to the first embodiment is mounted with the terminal block 170, which is a screw terminal, mounted on the back side. When attempting to connect to the lead wire 60 using a connecting part such as the terminal block 170, it is necessary to ensure the height of the connecting part. For example, as shown in FIG. 6, if the height of the terminal block 170 is about 10 mm, the round terminal 62 described later is about 1 mm, and the screw 61 is about 3 mm, the height is about 14 mm. When the connecting part is installed on the surface of the induction heating coil substrate 110, the gap between the induction heating coil substrate 110 and the top plate 10 must be widened. As described above, it is necessary to provide a gap between the induction heating coil substrate 110 and the top plate 10, but if the gap is too wide, the heating efficiency will be reduced. Therefore, by placing the terminal block 170 on the back side of the induction heating coil substrate 110, the height of the terminal block 170 is not an obstacle, and the distance between the induction heating coil substrate 110 and the top plate 10 can be set to the desired distance.

[0029] Furthermore, by making the area of ​​coil connection portion 113 larger than that of terminal block 170, the contact area between coil connection portion 113 and terminal block 170 is increased. Induction heating coil substrate 110 has a through hole at a position corresponding to coil connection portion 113, into which protrusion 171 of terminal block 170 is inserted. Coil connection portion 113 and terminal block 170 are fixed with solder.

[0030] Furthermore, terminal block 170, which is a screw terminal, has a screw hole 172. As shown in Fig. 6, an end of lead wire 60 is connected to a round terminal 62. Then, a screw 61 is passed through screw hole 172 of terminal block 170 and round terminal 62 to fix it, and lead wire 60 and terminal block 170 are electrically connected.

[0031] 10, the back surface of the induction heating coil substrate 110 is printed with a mark indicating the color of the lead wire 60 to be connected. By printing, it is possible to prevent operational errors such as connecting the wrong lead wire 60 when connecting the lead wire 60 to the terminal block 170. The printing is performed by silk printing, and can be performed in the same process as the process of printing the coil connection pattern line 116 and the coil connection part 113 of the thin film conductor on the induction heating coil substrate 110. Here, the printing is not limited to a mark, and any mark indicating the color of the lead wire 60 can be used, such as printing a mark of the same color.

[0032] 11 is a perspective view of the induction heating unit 100 according to the first embodiment as viewed from the back side. The holding member 130 has a coil connection portion through hole 132 corresponding to the terminal block 170. By inserting the terminal block 170 into the coil connection portion through hole 132, the terminal block 170 can be exposed at the bottom of the induction heating unit 100, facilitating the connection work with the lead wire 60. In addition, the terminal block 170 does not interfere with the fixation of the induction heating coil board 110 to the holding member 130.

[0033] As described above, according to the induction heating cooker of the first embodiment, the induction heating unit 100 has the induction heating coil 112 and the coil connection part 113 of a thin film conductor formed by printing on an insulating substrate. At this time, the lead wire 60 from the inverter substrate 52 having the inverter circuit and the coil connection part 113 are connected on the back surface of the induction heating coil substrate 110, which is the surface opposite to the front surface of the induction heating coil substrate 110 on which the induction heating coil 112 is formed. Therefore, the lead wire 60 and the connection parts can prevent damage to the back surface of the top plate 10 facing the front surface of the induction heating coil substrate 110.

[0034] Furthermore, in the induction heating coil substrate 110, the coil connection portion 113 is disposed on the outer periphery side of the induction heating coil 112. Therefore, it is possible to prevent the induction heating coil 112 from being damaged by the lead wire 60 connected to the coil connection portion 113. Furthermore, the outer end coil connection portion 113A and the inner end coil connection portion 113B, which are the coil connection portion 113, are disposed side by side along the same side. Therefore, it is possible to improve the efficiency of the work of connecting the lead wire 60 to the coil connection portion 113.

[0035] In the induction heating cooker of the first embodiment, the terminal block 170, which is a connection part, is soldered and installed on the coil connection part 113. Although the lead wire 60 can be directly soldered to the coil connection part 113, soldering to the terminal block 170 allows the work of connecting to the lead wire 60 to be performed more efficiently. In addition, the reliability of the connection is higher than that of directly soldering the lead wire 60. The terminal block 170 is a screw terminal, and fixing the round terminal 62 of the lead wire 60 with the screw 61 can improve workability and reliability. In addition, since a mark indicating the color of the lead wire 60 is printed on the induction heating coil board 110, it is possible to prevent work errors and improve workability. In addition, printing can be performed in the same process as the thin film conductor. In addition, since the lead wire 60 is a wire with an insulating coating of a twisted wire, it is highly reliable.

[0036] In the induction heating cooker according to the first embodiment, the holding member 130 and the induction heating coil board 110 are fixed with the fixing screw 150. This makes it easier to work with than adhesive fixing. Furthermore, the fixing screw 150 is made of a non-magnetic material and is not induction heated by magnetism.

[0037] Furthermore, the induction heating cooker in the first embodiment can prevent damage to the top plate 10 due to protrusions on the surface of the induction heating coil substrate 110 by providing a gap between the induction heating coil substrate 110 and the top plate 10 using the spacer 160. Also, the induction heating coil substrate 110 can be cooled by providing cooling holes 114 in the induction heating coil substrate 110 and passing air through the gap.

[0038] Embodiment 2 Fig. 12 is a perspective view of the induction heating coil substrate 110 according to the second embodiment as viewed from the front. As shown in Fig. 12, the front surface of the induction heating coil substrate 110 in the second embodiment is printed with a marking indicating the installation direction of the induction heating unit 100. This makes it possible to prevent operational mistakes such as installation in the wrong direction, thereby improving workability. The marking is performed by silk printing, and can be performed in the same process as the process of printing the induction heating coil 112 and the coil connection part 113, which are thin-film conductors, on the induction heating coil substrate 110.

[0039] Here, the mark is not limited to printing, and may be any mark indicating the installation direction, such as an arrow mark. For example, Fig. 12 shows a printing example in which both the character "Front" indicating the front side of the induction heating cooker shown in Fig. 1 and an arrow mark are printed, but either one of them may be printed.

[0040] Embodiment 3 Fig. 13 is a view of the induction heating coil substrate 110 according to the third embodiment as viewed from the back side. In the induction heating cooker according to the first embodiment described above, the coil via 115 and the internal terminal coil connection portion 113B are electrically connected by the coil connection pattern wire 116 made of a thin-film conductor. However, this is not limited to this. For example, as shown in Fig. 13, an internal terminal connection lead wire 180 may connect the coil via 115 and the internal terminal coil connection portion 113B.

[0041] Embodiment 4 The induction heating coil substrate 110 in the above-described first to third embodiments has one induction heating coil 112 formed on the substrate. However, this is not limited to this. A plurality of induction heating coils 112 may be formed on the substrate. Even in this case, the coil connection parts 113 corresponding to the respective induction heating coils 112 are disposed on the back surface of the induction heating coil substrate 110, a terminal block 170 is installed, and each induction heating coil 112 and the coil connection part 113 are connected by a coil via 115.

[0042] 14 is a perspective view of the back side of the induction heating coil substrate 110 according to the fourth embodiment. In the first embodiment, the screw 61 is passed through the screw hole 172 of the terminal block 170, which is a screw terminal, and the round terminal 62 for fixing. However, this is not limited to this. Alternatively, the induction heating coil substrate 110 may be provided with a tab terminal 63, and connected with a plug-in terminal to which the lead wire 60 is connected. In this case, since there is no need to use screws, the workability for connection is good.

[0043] Various aspects of the present disclosure are summarized below as appendices.

[0044] (Appendix 1) an induction heating coil substrate having an induction heating coil in which a conductor is wound on an insulating substrate; a power control board that supplies power to the induction heating coil; Equipped with An induction heating cooker having a plurality of coil connection portions, to which lead wires connecting the induction heating coil and the power control board are fixed, on the side of the induction heating coil board opposite to the side on which the induction heating coil is provided. (Appendix 2) 2. The induction heating cooker according to claim 1, wherein in the induction heating coil substrate, the coil connection portions are arranged on an outer circumferential side relative to the induction heating coil. (Appendix 3) 3. The induction heating cooker according to claim 2, wherein the coil connection portions of the induction heating coil board are arranged side by side along one side. (Appendix 4) 4. The induction heating cooker according to claim 1, wherein a connection part for connecting the lead wire is mounted on the coil connection part. (Appendix 5) 5. The induction heating cooker according to claim 4, wherein the connecting part has a screw terminal. (Appendix 6) 5. The induction heating cooker according to claim 4, wherein the connecting part has a tab terminal. (Appendix 7) 4. The induction heating cooker according to claim 1, wherein the coil connection portion and the lead wire are directly connected by soldering. (Appendix 8) 8. The induction heating cooker according to any one of claims 1 to 7, further comprising a holding member that is fastened to the induction heating coil board with a fixing screw and holds the induction heating coil board. (Appendix 9) 9. The induction heating cooker according to claim 8, wherein the fixing screw is made of a non-magnetic material. (Appendix 10) A top plate on which an object to be heated is placed; a spacer that forms a gap between the upper surface of the induction heating coil substrate and the rear surface of the top plate; 10. The induction heating cooker according to any one of claims 1 to 9, comprising: (Appendix 11) 11. The induction heating cooker according to any one of claims 1 to 10, wherein a mark indicating a color of the lead wire to be connected is printed on the induction heating coil board. (Appendix 12) 12. The induction heating cooker according to any one of claims 1 to 11, wherein a mark indicating an installation direction of the induction heating coil board is printed on the induction heating coil board. (Appendix 13) 13. The induction heating cooker according to any one of claims 1 to 12, wherein the lead wire is a wire obtained by insulating a twisted wire. (Appendix 14) 14. The induction heating cooker according to any one of claims 1 to 13, wherein an inner end of the induction heating coil and the coil connection portion are connected by an inner end connection lead wire. [Explanation of symbols]

[0045] 1 main body case, 10 top plate, 11 heating area, 20 grill cooking device, 21 grill door, 30 operation display panel, 40 air intake, 41 air exhaust, 50 control box, 51 filter board, 52 inverter board, 53 switching element, 54 heat sink, 55 control device, 56 power cord, 60 lead wire, 61 screw, 62 round terminal, 63 tab terminal, 100 induction heating unit, 110 induction heating coil board, 112 induction heating coil, 113 coil connection part, 113A outer end coil connection part, 113B inner end coil connection part, 114 cooling hole, 115 coil via, 116 coil connection pattern line, 120 ferrite, 130 holding member, 131 spring, 132 coil connection part through hole, 140 magnetic shielding member, 150 fixing screw, 160 Spacer, 170 terminal block, 171 protrusion, 172 screw hole, 180 lead wire for internal termination connection.

Claims

1. an induction heating coil substrate having an induction heating coil in which a conductor is wound on an insulating substrate; a power control board that supplies power to the induction heating coil; Equipped with An induction heating cooker having a plurality of coil connection portions, to which lead wires connecting the induction heating coil and the power control board are fixed, on the side of the induction heating coil board opposite to the side on which the induction heating coil is provided.

2. The induction heating cooker according to claim 1 , wherein the induction heating coil substrate includes a plurality of the coil connection portions disposed on an outer circumferential side of the induction heating coil.

3. The induction heating cooker according to claim 2 , wherein the coil connection portions of the induction heating coil board are arranged side by side along one side.

4. The induction heating cooker according to any one of claims 1 to 3, wherein a connection part for connecting the lead wire is mounted on the coil connection part.

5. The induction heating cooker according to claim 4 , wherein the connecting parts have screw terminals.

6. The induction heating cooker according to claim 4 , wherein the connecting part has a tab terminal.

7. The induction heating cooker according to any one of claims 1 to 3, wherein the coil connection portion and the lead wire are directly connected by soldering.

8. The induction heating cooker according to any one of claims 1 to 3, further comprising a holding member that is fastened to the induction heating coil board with a fixing screw and holds the induction heating coil board.

9. 9. The induction heating cooker according to claim 8, wherein the fixing screw is made of a non-magnetic material.

10. A top plate on which an object to be heated is placed; a spacer that forms a gap between the upper surface of the induction heating coil substrate and the rear surface of the top plate; The induction heating cooker according to any one of claims 1 to 3, comprising:

11. The induction heating cooker according to any one of claims 1 to 3, wherein a mark indicating a color of the lead wire to be connected is printed on the induction heating coil board.

12. The induction heating cooker according to any one of claims 1 to 3, wherein a mark indicating an installation direction of the induction heating coil board is printed on the induction heating coil board.

13. 4. The induction heating cooker according to claim 1, wherein the lead wire is a wire in which a twisted wire is insulated.

14. The induction heating cooker according to any one of claims 1 to 3, wherein an inner end of the induction heating coil and the coil connection portion are connected by an inner end connection lead wire.

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