Home appliances

Abstract

An invention relating to home appliances is disclosed. The disclosed invention includes a heating coil formed by multiple layers of conductors stacked in the vertical direction, characterized in that the lateral outer shape of the heating coil is polygonal. This suppresses the increase in the lateral size of the heating coil and increases the pattern cross-sectional area per turn of the heating coil, thereby effectively suppressing the temperature rise of the heating coil.

Description

[Technical Field]

[0001] The present invention relates to home appliances, and more particularly to home appliances (home appliance devices; home appliances) comprising a heating coil assembly. [Background technology]

[0002] Cooking appliances are a type of electrical appliance used to prepare food and beverages. They are installed in a kitchen space and prepare food and beverages according to the user's intentions. These cooking appliances can be classified in various ways depending on the heat source or form used and the type of fuel.

[0003] Cooking appliances can be classified into two types based on the method of preparing food and beverages: open-type and enclosed-type appliances, depending on the type of space in which the food and beverages are placed. Enclosed-type appliances include ovens and microwave ovens, while open-type appliances include cooktops and hobs.

[0004] Among open-type cooking appliances, the cooktop is designed to allow heating of food and beverages in a cooking container using at least one burner. These cooktops may be provided with electric burners or with gas burners. Furthermore, the cooktop may be implemented independently, or it may be implemented in the form of an oven range with an oven located below the cooktop.

[0005] One example of a cooktop equipped with an electric burner is an induction heating appliance. An induction heating appliance is a cooking appliance that performs cooking functions using the induction heating method. In an induction heating appliance, when an electric current is applied to the heating coil, eddy currents are generated in the cooking container, which is made of magnetic material. The cooking container, which acts as a resistance to these eddy currents and generates heat, cooks the food and beverages.

[0006] These induction cookers do not require gas combustion and therefore do not generate combustion exhaust gases. Furthermore, induction cookers generate heat immediately within the container itself, minimizing the processes of heat transfer through radiation and conduction, allowing for rapid heating of food.

[0007] Typically, induction heating appliances have a top plate on the heating coil that indicates where the cooking container should be placed. The heating coil then heats the cooking container when it is placed in this indicated area.

[0008] An induction heating cooking appliance may be provided with one or more working coils and a circuit board. The working coil plays the role of transmitting electromagnetic force to the cooking container. Generally, the working coil may be formed in the form of a wire wound in a spiral. The circuit board can play the role of controlling the supply of induced current to the working coil in a circuit-like manner.

[0009] In recent years, working coils with a coil pattern formed on a circuit board are sometimes used instead of working coils made by winding wires in a spiral shape.

[0010] Of the costs and time required to manufacture induction heating cooking equipment, the costs and time invested in the production of the working coil account for a significant portion. This includes the cost of the wire itself, and the considerable cost and time required to wind the wire.

[0011] Instead of winding wire to form a working coil, forming a coil-shaped pattern on a circuit board can reduce the cost and time required to manufacture the working coil.

[0012] High-frequency power is applied to the working coil, which generates a considerable amount of heat. In particular, in induction heating cooking appliances that require high power, a large amount of heat is generated in the working coil due to the high power applied.

[0013] When forming a working coil by creating a coil-shaped pattern on a circuit board, the limited area of ​​the circuit board necessitates that the coil pattern be concentrated in a small area of ​​the circuit board. As a result, a large amount of heat is applied to the circuit board where the working coil is formed relative to its surface area, which can cause the temperature of the circuit board to rise excessively.

[0014] On the other hand, in recent years, induction heating appliances have been developed that automatically recognize the size and position of a cooking container and perform heating in a manner appropriate to it, even if the cooking container is not placed in a specific location. For heating in these types of induction heating appliances to be more effective, the number of working coils in the appliance must be increased.

[0015] Therefore, in induction heating cooking equipment of the above-described form, it is difficult to apply a coil-patterned working coil due to the problem of temperature rise caused by the concentration of coil patterns. [Overview of the project] [Problems that the invention aims to solve]

[0016] The object of this invention is to provide a home appliance with an improved structure that can suppress the temperature rise of a coil-patterned heating coil.

[0017] Another object of the present invention is to provide a home appliance in which the structure is improved so that the density of the area occupied by the heating coil within the appliance can be increased.

[0018] Another object of the present invention is to provide a home appliance with an improved structure that allows heating coils to be arranged more densely and suppresses the temperature rise of the heating coils.

[0019] Another object of the present invention is to provide a home electric appliance having an improved structure such that the loss of the original plate used for manufacturing the coil substrate portion can be reduced while the density of the region occupied by the heating coil in the device is increased.

[0020] Another object of the present invention is to provide a home electric appliance having an improved structure that can simplify the connection structure between the heating coil and the electrical component portion.

[0021] Another object of the present invention is to provide a home electric appliance having an improved structure that can suppress a decrease in the pattern cross-sectional area per turn of the heating coil due to foil loss generated during the formation process of the coil pattern.

[0022] Another object of the present invention is to provide a home electric appliance having an improved structure such that the aesthetic appearance of the home electric appliance is not degraded by the structure related to the heating coil. [MEANS FOR SOLVING THE PROBLEM]

[0023] To achieve the above object, a home electric appliance according to an embodiment of the present invention includes a heating coil formed by conductors stacked in a plurality of layers, and is characterized in that the outer shape of the heating coil is polygonal.

[0024] According to another aspect of the present invention, a heating coil formed by a plurality of pattern coils stacked in the vertical direction is included, and the lateral outer shape of the heating coil is polygonal.

[0025] According to another aspect of the present invention, pattern coils patterned on a substrate are stacked in the vertical direction to form a heating coil, and the lateral outer shape of the heating coil is polygonal.

[0026] According to another aspect of the present invention, the home electric appliance is characterized by comprising: a heating coil formed by conductors stacked in a plurality of layers; and a plurality of coil modules including at least one heating coil.

[0027] Another embodiment of the present invention includes a coil module having at least one heating coil formed by a plurality of pattern coils stacked in the vertical direction, characterized in that a plurality of coil modules are arranged along the horizontal direction.

[0028] Another embodiment of the present invention includes a rectangular coil module having a heating coil whose lateral outer shape is rectangular, characterized in that a plurality of coil modules are arranged in a row along the lateral direction.

[0029] Another embodiment of the present invention includes a coil module having at least one heating coil formed by a plurality of pattern coils stacked in the vertical direction, characterized in that the plurality of heating coils are arranged along the horizontal direction.

[0030] Another embodiment of the present invention includes a coil module having at least one heating coil, characterized in that a plurality of coil sections stacked in the vertical direction are connected in the vertical direction, each forming a single heating coil.

[0031] Another embodiment of the present invention includes a heating coil formed by stacking a plurality of first coil substrates, characterized in that the outer shape of the heating coil is polygonal.

[0032] Another embodiment of the present invention includes a coil substrate having a pair of coil portions patterned on both sides of the core in the vertical direction, and an adhesive that is stacked vertically with a plurality of coil substrate portions to bond the coil substrate portions, wherein the adhesive is placed between a pair of coil portions facing each other in the vertical direction to form an insulating layer between them.

[0033] Another embodiment of the present invention includes a coil module having at least one heating coil, wherein the coil module includes a mask covering the outermost surface in the vertical direction of the coil substrate laminate, and the mask is formed in a low-luminosity color.

[0034] Another embodiment of the present invention includes a coil substrate laminate formed by stacking coil patterns in the vertical direction, and a vertical connecting portion that connects a plurality of coil patterns stacked in the vertical direction in the vertical direction, wherein the vertical connecting portion includes vias that connect the plurality of coil patterns in the vertical direction, and a plurality of vias arranged in the horizontal direction in each vertical connecting portion are connected to each other.

[0035] Another embodiment of the present invention includes a coil module having at least one heating coil, wherein the heating coil is formed by a coil pattern patterned on a plurality of coil substrates stacked in the vertical direction, and the vertical cross-section of the coil pattern is formed in a polygonal shape where the length of the upper base is less than the length of the lower base.

[0036] A home appliance according to one aspect of the present invention includes at least one coil module containing a heating coil for induction heating of an object to be heated, wherein the heating coil may be formed by a plurality of coil patterns stacked in the vertical direction.

[0037] Furthermore, the vertical cross-section of each of the coil patterns may be formed in a polygonal shape, including a lower base and an upper base separated by the thickness of the coil pattern.

[0038] Preferably, the length of the upper base may be less than the length of the lower base.

[0039] Furthermore, it is preferable that the vertical cross-section of the coil pattern be formed in a polygonal shape, where the length of the upper base is 70% to 80% of the length of the lower base.

[0040] Furthermore, it is preferable that the vertical cross-section of the coil pattern be formed in a trapezoidal shape with the lower bases parallel to each other.

[0041] Furthermore, it is preferable that the vertical cross-section of the coil pattern is formed in a polygonal shape, including a pair of side edges that connect the lower base and the upper base in the vertical direction.

[0042] Furthermore, each of the aforementioned sides preferably includes a first side connected to the upper base and a second side connecting the first side and the lower base, and the second side preferably forms an inclined surface that moves away from the lateral center of the lower base as it approaches the lower base.

[0043] Furthermore, it is preferable that the first side is formed in a straight line in the vertical direction.

[0044] Furthermore, it is preferable that the second side is formed by an inclined surface connecting the lower end of the first side and the lower base.

[0045] Furthermore, it is preferable that the coil pattern is formed on the coil substrate as a result of the removal of portions of the foil laminated on the core that have not been hardened by exposure, due to corrosion.

[0046] Furthermore, the longitudinal cross-section of the coil pattern can satisfy the following relationship.

[0047] 0.47 ≤ W1 / t ≤ 0.57

[0048] (However, W1 is the length of the bottom of the coil pattern, and t is the thickness of the coil pattern.)

[0049] Furthermore, the lateral outer shape of the heating coil is preferably a rectangle with a length of 98 mm to 100 mm in the first direction and a length of 118 mm to 120 mm in the second direction perpendicular to the first direction.

[0050] Furthermore, it is preferable that the coil substrate portion includes a plurality of coil patterns arranged along the diametrical direction of the spiral formed by the heating coil.

[0051] Furthermore, the width of each of the aforementioned coil patterns is preferably 0.3 mm to 0.6 mm.

[0052] Furthermore, it is preferable that the coil substrate portion includes a pair of coil patterns arranged along the diametrical direction of the spiral formed by the heating coil.

[0053] Furthermore, it is preferable that the thickness of each coil pattern is 0.10 mm to 0.11 mm, and the width of each coil pattern is 0.5 mm to 0.6 mm.

[0054] Furthermore, it is preferable that one of the lower base and the upper base forms a flat surface, and the other of the lower base and the upper base forms an uneven surface.

[0055] Furthermore, the coil module may be formed by a plurality of coil substrates stacked in the vertical direction.

[0056] Furthermore, each of the coil substrate portions may include at least one of the coil patterns patterned on the core.

[0057] Furthermore, the lower base may be in contact with the core, while the upper base may be separated from the core vertically by the thickness of the coil pattern.

[0058] Furthermore, it is preferable to deposit the coil pattern onto the upper and lower surfaces of the core, respectively.

[0059] Furthermore, it is preferable that the coil pattern be deposited onto the insulating layer such that the bottom surface is in contact with the insulating layer.

[0060] Furthermore, it is preferable that the lower base forms a flat surface and the upper base forms an uneven surface.

[0061] Furthermore, the coil pattern may include a first coil pattern in which the lower base is positioned on the lower side and the upper base is positioned on the upper side, and a second coil pattern in which the lower base is positioned on the upper side and the upper base is positioned on the lower side.

[0062] Furthermore, it is preferable that the first coil pattern and the second coil pattern are arranged alternately in the vertical direction.

[0063] Furthermore, the coil pattern may include a first coil pattern positioned above the insulating layer and a second coil pattern positioned below the insulating layer.

[0064] Furthermore, it is preferable that the first coil pattern and the second coil pattern are arranged symmetrically with respect to a horizontal line.

[0065] Furthermore, the coil module may include vias connected to the coil pattern, or dummy vias not connected to the coil pattern.

[0066] Furthermore, it is preferable that the diameter of the via or the dummy via is longer than the length of the bottom base.

[0067] Furthermore, it is preferable that the inner diameter of the via is shorter than the length of the lower base. [Effects of the Invention]

[0068] This invention forms a patterned coil-shaped heating coil as a result of connecting multiple coil patterns stacked in the vertical direction, thereby increasing the length of the heating coil in the vertical direction and effectively increasing the pattern cross-sectional area per turn of the heating coil.

[0069] These inventions effectively suppress the rise in temperature of the heating coil by suppressing an increase in the lateral size of the heating coil and increasing the pattern cross-sectional area per turn of the heating coil.

[0070] Furthermore, the present invention allows for an effective improvement in the density of the area occupied by the heating coil within the cooktop by forming the outer shape of the heating coil, which is arranged in a coil module formed in a polygonal shape similar to the outer shape of the cooktop, and forming the outer shape of the heating coil in a polygonal shape similar to the outer shape of the coil module.

[0071] As a result, the present invention can improve the heating efficiency of home appliances by increasing the area of ​​the region in contact with the heating coil of the object to be heated.

[0072] Furthermore, the present invention enables the formation of a heating coil as a result of connecting multiple coil wires stacked in the vertical direction, and by forming a lateral twist structure and a vertical twist structure in these heating coils, the pattern cross-sectional area per turn of the heating coil can be increased while minimizing the increase in the lateral size of the heating coil.

[0073] These inventions reduce the size of the heating coils and decrease the density of the current flowing through them, allowing for a more dense arrangement of heating coils compared to cooktops of the same specifications, and enabling the maximum output to be maintained for a longer period of time compared to cooktops of the same specifications.

[0074] As a result, the present invention can not only provide improved heating efficiency using small and densely arranged heating coils (WC), but also provide higher output for a longer period of time.

[0075] Furthermore, by constructing the heating coil assembly from a combination of multiple coil modules, the present invention not only reduces the loss of raw materials used in the manufacture of the coil modules, but also effectively secures the space necessary for the placement of the cooktop control panel on the cooktop.

[0076] Furthermore, according to the present invention, the wiring for connecting the heating coil and sensing coil to the terminal section is formed in a patterned form on the coil module itself, and the connection between the heating coil and sensing coil and the electrical section can be made solely by connecting the terminal section and the electrical section. This makes it possible to form the connection structure between the heating coil and sensing coil and the electrical section very simply.

[0077] As a result, the present invention not only makes it easy and quick to connect the heating coil assembly and the electrical components, but also provides the effect of preventing the internal storage space of the cooktop, where the heating coil assembly and electrical components are housed, from becoming complicated by numerous wires.

[0078] Furthermore, the present invention provides the first longitudinal connection portion with a plurality of vias, thereby increasing the amount of conductor provided by the vias, and thereby effectively reducing the resistance and heat generated in the first longitudinal connection portion.

[0079] Furthermore, the heating coil of the present invention may be formed such that the length of the lower base of the coil pattern is set to a range of 1.47 to 1.57 times the thickness of the coil pattern.

[0080] These heating coils of the present invention may be formed such that, even if the length of the upper base is 20% or more shorter than the length of the lower base during the coil pattern formation process, they have a sufficient pattern cross-sectional area per turn to effectively suppress the temperature rise of the heating coil.

[0081] Furthermore, the present invention ensures that the surface of the coil module formed by the mask is the same or similar in color to the hue of the cover portion. This allows the heating coil assembly to be installed inside the cook plate so that it is not easily visible from the outside of the cook plate, thereby effectively suppressing the deterioration of the aesthetic appearance of the home appliance caused by the heating coil assembly. [Brief explanation of the drawing]

[0082] [Figure 1] This is a perspective view showing a home appliance according to one embodiment of the present invention. [Figure 2] This is a plan view showing the cook plate shown in Figure 1, separated from its original form. [Figure 3] This figure shows the illumination status of the indicator lights on the cooktop shown in Figure 2. [Figure 4] Figure 2 is an exploded perspective view showing the disassembled state of the cooktop. [Figure 5] This figure shows the state in which electrical components are installed on the bottom surface of the supporter shown in Figure 4. [Figure 6] Figure 4 is a schematic plan view showing the configuration of the heating coil assembly. [Figure 7] Figure 6 is a schematic cross-sectional view showing the stacked structure of the coil module. [Figure 8] This is a plan view showing a first example of the arrangement structure of the first coil module and the second coil module. [Figure 9] This diagram schematically shows an example of the cutting state of the raw material for forming the first coil substrate. [Figure 10] This is a plan view showing a second example of the arrangement structure of the first coil module and the second coil module. [Figure 11] Figure 8 is a plan view showing another example of the arrangement structure of the first and second coil modules. [Figure 12] Figure 10 is a plan view showing another example of the arrangement structure of the first and second coil modules. [Figure 13] This is a plan view showing a third example of the arrangement structure of the first coil module and the second coil module. [Figure 14] This is a plan view showing a fourth example of the arrangement structure of the first coil module and the second coil module. [Figure 15] This is a plan view showing a fifth example of the arrangement structure of the first coil module and the second coil module. [Figure 16] This is a plan view showing a sixth example of the arrangement structure of the first coil module and the second coil module. [Figure 17] This is a plan view showing an example of a first coil substrate according to one embodiment of the present invention. [Figure 18] This is an enlarged view showing a portion of the first coil substrate shown in Figure 17. [Figure 19] Figure 18 is a schematic cross-sectional view showing the laminated structure of the first coil section. [Figure 20] This is a plan view showing an example of the arrangement structure of a sensing coil. [Figure 21] This is an enlarged view of a portion of Figure 20, showing an example of the arrangement structure of the sensing coil relative to the heating coil. [Figure 22] This is an enlarged view of Terminal 1 shown in Figure 18. [Figure 23] This is an enlarged view of Terminal 2 shown in Figure 18. [Figure 24] This is a plan view showing the seventh example of the arrangement structure of the first coil module and the second coil module. [Figure 25] This is a schematic diagram showing a configuration relating to power supply for home appliances according to one embodiment of the present invention. [Figure 26] Figure 25 is an illustrative diagram of the drive circuit and load circuit shown. [Figure 27] This is a plan view showing an example of a heating coil. [Figure 28] This is a plan view showing another example of a heating coil. [Figure 29] This is an enlarged view showing the first coil section in detail. [Figure 30] This figure shows an example of a connection structure between a coil pattern laminate and the first longitudinal connection section. [Figure 31] Figure 30 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section. [Figure 32] This figure shows another example of a coil pattern laminate and a connecting structure for the first longitudinal connection. [Figure 33] Figure 32 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section. [Figure 34] This figure shows another example of the first longitudinal connection. [Figure 35] Figure 34 shows an example of a connection structure between a coil pattern laminate and the first longitudinal connection section. [Figure 36] Figure 35 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section. [Figure 37] Figure 34 shows another example of the coil pattern laminate and the connecting structure of the first longitudinal connection section. [Figure 38] Figure 37 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section. [Figure 39] This figure shows another example of a coil pattern laminate and a connecting structure for the first longitudinal connection. [Figure 40] Figure 39 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section. [Figure 41] This figure shows yet another example of the connection structure between the coil pattern laminate and the first longitudinal connection section. [Figure 42] Figure 41 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section. [Figure 43] This is a cross-sectional view showing an example of a laminated structure of the second outer layer and the second coil substrate. [Figure 44] This is an enlarged view showing a portion of the second outer layer. [Figure 45] This is an enlarged view showing a portion of the second coil substrate. [Figure 46] This is an enlarged view showing a portion of the first coil substrate. [Figure 47] This diagram shows the second terminal and the second terminal separated. [Figure 48] Figure 47 is a schematic cross-sectional view showing the stacked structure of the second terminal and the second connector. [Figure 49] This diagram shows the heating coil assembly covered with a mask. [Figure 50]Figure 49 is a schematic cross-sectional view showing an example of the laminated structure of the heating coil assembly shown. [Figure 51] This is a schematic cross-sectional view showing the heating coil assembly covered by the top plate. [Figure 52] Figure 49 is a schematic cross-sectional view showing another example of the laminated structure of the heating coil assembly shown. [Figure 53] This is a flowchart illustrating the manufacturing process of a coil substrate laminate according to one embodiment of the present invention. [Figure 54] Figure 53 is a flowchart that schematically shows the progression of the connection stage. [Figure 55] This figure illustrates an example of a heating coil assembly according to one embodiment of the present invention. [Figure 56] This figure shows the first coil module, as shown in Figure 55, separated from its original form. [Figure 57] This figure shows the second coil module, as shown in Figure 55, separated from the original. [Figure 58] This figure shows the heating coil shown in Figure 55 separated. [Figure 59] This is a schematic cross-sectional view showing an example of the arrangement structure per turn of the first coil section. [Figure 60] This is a schematic cross-sectional view showing another example of the arrangement structure per turn of the first coil section. [Figure 61] This is a magnified cross-sectional view showing the laminated structure of the heating coil assembly. [Figure 62] This is a cross-sectional view showing the longitudinal cross-sectional shape of the pattern coil. [Figure 63] This is an enlarged view of the pattern coil shown in Figure 62. [Figure 64] This table compares a pattern coil according to one embodiment of the present invention with a comparative example. [Figure 65] This is a magnified cross-sectional view showing the longitudinal cross-sectional shape of a pattern coil formed by etching. [Figure 66] This is a cross-sectional view showing another example of a patterned coil formed by etching. [Modes for carrying out the invention]

[0083] The aforementioned objectives, features, and advantages will be described in detail below with reference to the attached drawings, so that a person with ordinary skill in the art to which the present invention pertains can easily implement the technical concept of the present invention. In describing the present invention, if a specific description of known technology according to the present invention is deemed to obscure the gist of the present invention, then such detailed description will be omitted. Hereafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

[0084] Although terms such as "first," "second," etc., are used to indicate various components, these components are not limited by these terms. These terms are simply used to distinguish one component from another, and unless otherwise specified, the first component may also be the second component.

[0085] The present invention is not limited to the embodiments disclosed below, and can be modified in various ways and embodied in various forms that differ from one another. However, these embodiments are provided to complete the disclosure of the present invention and to fully inform those in the ordinary skill of the scope of the invention. Therefore, it should be understood that the present invention is not limited to the embodiments disclosed below, and includes any modifications, equivalents or substitutes that fall within the technical spirit and scope of the present invention, as well as the substitution or addition of configurations from one embodiment to another.

[0086] The accompanying drawings are provided to facilitate understanding of the embodiments disclosed herein and should be understood not to limit the technical concept disclosed herein, but rather to include any modifications, equivalents, or substitutions that fall within the concept and technical scope of the present invention. Components in the drawings may be exaggerated in size or thickness for ease of understanding, but this should not be interpreted as restricting the scope of protection of the present invention.

[0087] The terms used herein are used solely to describe specific examples and embodiments and are not intended to limit the invention. Furthermore, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "includes" and "contains" in the specification are intended to indicate the existence of features, figures, stages, operations, components, parts, or combinations thereof described herein. In other words, terms such as "includes" and "contains" in the specification should not be understood as preemptively excluding the existence or possibility of adding one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0088] Terms including ordinal numbers, such as "1st," "2nd," etc., are used to describe various components, but the components themselves are not limited by these terms. These terms are used solely to distinguish one component from others.

[0089] When it is mentioned that one component is “linked” or “connected” to another component, it must be understood that it may be directly linked to or connected to the other component, but that other components may exist in between. On the other hand, when it is mentioned that one component is “directly linked” or “directly connected” to another component, it must be understood that there are no other components in between.

[0090] When one component is described as being "above" or "below" another component, it must be understood that it is not only positioned directly above the other component, but that other components may exist between them.

[0091] Unless otherwise defined, technical or scientific terms are used herein, and all terms used herein have the same meaning as they would be generally understood by a person of ordinary skill in the art to which this invention pertains. Terms similar to those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as ideal or overly formal unless explicitly defined herein.

[0092] With the cooking appliance placed on the floor, the direction in which the door is installed is defined as the front, relative to the center of the appliance. Therefore, the direction in which one enters the interior of the appliance by opening the door is the rear. The horizontal direction perpendicular to the front-to-back direction of the appliance, that is, the width direction of the appliance when facing the appliance in front of the door, can be called the left-to-right direction.

[0093] For convenience, we can refer to the left-right direction as the first direction. Then, the right side can be said to be one side of the first direction, and the left side can be said to be the other side of the first direction.

[0094] Furthermore, the width direction of the cooking appliance can also be called the lateral direction. In that case, the right side can be called one side in the lateral direction, and the left side can be called the other side in the lateral direction.

[0095] Furthermore, the direction of gravity can be defined as downward, and the direction opposite to the direction of gravity can be defined as upward.

[0096] For convenience, we can refer to these forward and backward directions as the second direction. Then, forward can be said to be one of the second directions, and backward to be the other of the second directions.

[0097] Furthermore, the vertical direction mentioned above can be called the third direction. In that case, upward can be said to be one of the third directions, and downward can be said to be the other of the third directions.

[0098] Furthermore, the up-and-down direction mentioned above can be called the vertical direction. Then, the front-to-back direction and the left-to-right direction, that is, the first and second directions, can be included and called the horizontal direction.

[0099] Throughout the specification, "A and / or B" means A, B, or A and B unless otherwise specified, and "C to D" means C or greater and D or less unless otherwise specified.

[0100] [General structure of cooking appliances] Figure 1 is a perspective view showing a home appliance according to one embodiment of the present invention, Figure 2 is a plan view showing the cooktop shown in Figure 1 separated, and Figure 3 is a diagram showing the illumination state of the indicator light on the cooktop shown in Figure 2.

[0101] For example, the home appliance may include a cooking appliance with a cooktop. However, the home appliance of the present invention is not limited to cooking appliances, and various types of appliances such as washing machines, water purifiers, clothes dryers, and clothing management machines can be applied as home appliances of the present invention. Below, we will describe an embodiment of the home appliance of the present invention, using a cooking appliance as an example.

[0102] Referring to Figures 1 to 3, the cooking appliance of this embodiment may include a cooktop 100. Furthermore, the cooking appliance of this embodiment may further include an oven section 10. In this embodiment, the cooking appliance is provided in the form of a microwave oven.

[0103] The cooking appliance of this embodiment, provided in the form of a microwave oven, can provide both the function of an oven, which is a sealed cooking appliance, and the function of a cooktop, which is an open cooking appliance. These cooking appliances may include an oven section 10 and a cooktop 100.

[0104] A cooking chamber may be formed inside the oven section 10. Food and beverages may be cooked in the oven section by heating the inside of the cooking chamber.

[0105] The oven section 10 may be provided with a heating section for heating the cooking chamber. The heating section may be provided as a heating device that uses gas fuel, or as a heater that uses electricity.

[0106] The cooking appliance may be provided with a rotatable door 11 that selectively opens and closes the cooking compartment. For example, the door may be provided in a pull-down manner in which the upper end rotates up and down around the lower end to open and close the cooking compartment.

[0107] A control panel 13 (hereinafter referred to as the "main control panel") may be provided at the top of the front of the cooking appliance. The main control panel 13 can form part of the front appearance of the cooking appliance. These main control panels 13 may be equipped with various switches for adjusting the operation of the cooking appliance and a display for showing the operating status of the cooking appliance.

[0108] A cooktop 100 may be positioned above the oven section 10. The cooktop is provided to allow heating of food or beverages or containers containing food or beverages that are attached to the top of the cooktop 100.

[0109] [Overall structure of the cooktop] Figure 4 is an exploded perspective view showing the disassembled state of the cooktop shown in Figure 2, and Figure 5 shows the state in which electrical components are installed on the bottom surface of the supporter shown in Figure 4.

[0110] Referring to Figures 1 to 5, the cooktop 100 may include a case 110 and a top plate 120. According to this embodiment, the appearance of the cooktop 100 may be formed by the case 110 and the top plate 120. The case 110 is positioned below the top plate 120 and can form the front, back, sides, and bottom of the cooktop. The top plate 120 is positioned at the upper end of the cooktop 100 and can form the appearance of the top surface of the cooktop 100.

[0111] A storage space may be formed inside the case 110. The storage space formed inside the case 110 may be open towards the top. For example, the case 110 may be formed in a hexahedral shape with the top open. Various internal components that make up the cooktop 100 may be housed in the storage space enclosed by the top plate 120 and the case 110.

[0112] According to this embodiment, the case 110 may include a bottom portion 111. The bottom portion 111 forms the bottom surface of the case 110 and can define the lower boundary surface of the housing space. The bottom portion 111 is positioned below the top plate 120 and can form a plane parallel to the top plate 120.

[0113] Furthermore, the case 110 may include side wall portions 113. The side wall portions 113 can form the front, back, and both sides of the case 110, and may be formed as vertical walls extending upward from the frame of the bottom portion 111. These side wall portions 113 can define the lateral boundary surface of the storage space.

[0114] Furthermore, the cooktop 100 may be equipped with a heating section for heating food or beverages to be cooked or containers containing food or beverages (hereinafter referred to as "objects to be heated"). The heating section may be equipped with at least one burner. For example, the burner may be provided in a form that includes an electric heating coil or a heating wire coil.

[0115] In this embodiment, the cooktop 100 is provided in the form of an induction heating cooking appliance. The burner of these cooktops 100 may include a heating coil. Thus, the burner including the heating coil can be operated by a high-frequency current applied by an inverter to generate strong magnetic field lines.

[0116] Thus, the magnetic field lines generated by the torch, which includes a heating coil, may generate eddy currents in the container. Heat is generated as these eddy currents flow through the container, heating the container, and the food or beverage contained within the container may be heated as a result of the container being heated.

[0117] Furthermore, the cooktop 100 in this embodiment may be equipped with a control panel 130 (hereinafter referred to as the "cooktop control panel"). The cooktop control panel 130 may be placed on the top plate 120. These cooktop control panels 130 may be equipped with an operating section including various switches for adjusting the operation of the cooktop 100, and a display for showing the operating status of the cooktop 100.

[0118] The cooktop 100 may be provided with multiple indicator lights (L). The indicator lights (L) may be displayed on the top plate 120 of the cooktop. These indicator lights (L) can display information regarding the position of the food or beverage to be heated or the cooking container containing such food or beverage (hereinafter referred to as "heated object"), the heating status of the heated object, its temperature, etc.

[0119] The cooktop 100 in this embodiment may include a heating coil assembly 140. The heating coil assembly 140 is provided to constitute the heating section of the cooktop 100 and may be located in the internal storage space of the cooktop 100.

[0120] Furthermore, the cooktop 100 may include a supporter 150. The supporter 150 may be positioned on the underside of the top plate 120. These supporters 150 may be positioned in the space enclosed by the top plate 120 and the case 110, i.e., the storage space.

[0121] The supporter 150 can form a framework inside the cooktop 100 to support various internal components that make up the cooktop. For example, the supporter 150 may be formed in a hexahedral shape with the bottom open. For instance, the supporter 150 may be formed in a shape that is roughly the same as the case 110 but slightly smaller than the case 110.

[0122] According to this embodiment, the storage space may be formed inside the supporter 150 and may be formed as a space enclosed by the bottom 111 of the case 110 and the supporter 150. That is, the various internal components constituting the cooktop 100 may be housed inside the supporter 150.

[0123] According to this embodiment, the supporter 150 can also provide a coil base function. That is, a ferrite core 160 may be installed on the supporter 150, and the heating coil assembly 1000 may be installed on the upper side of the supporter 150 on which the ferrite core 160 is installed.

[0124] For example, the ferrite core 160 may be formed from a combination of multiple ferrite modules 161 provided separately. That is, the ferrite core 160 may be provided in a structure that can be separated into multiple ferrite modules 161.

[0125] In this embodiment, it is illustrated that each ferrite module 161 is provided so as to be able to be coupled to the support portion 150. For this reason, a structure for mating and coupling with the ferrite modules 161 may be formed on the support portion 150. Each ferrite module 161 may be coupled to the support portion 150 by mating and coupling with this structure.

[0126] Each ferrite module 161 contains ferrite capable of forming a magnetic field around the ferrite module 161. As an example, each ferrite module 161 may be provided in a form in which the ferrite is insert-extruded.

[0127] As described above, the ferrite core 160 formed by the combination of multiple ferrite modules 161 can reduce the amount of work required to install the ferrite core 160 inside the cooktop 100. Furthermore, the ferrite core 160 has the advantage that if a part of the ferrite core 160 is damaged, it can be repaired by replacing the ferrite module 161 in that part.

[0128] Each indicator light (L) may be embodied by a lighting module 180. The lighting module 180 is provided to emit light toward the light display area of ​​the top plate 120. For example, the indicator light (L) may be embodied by the light that the lighting module 180 irradiates onto the light display area of ​​the top plate 120.

[0129] In this embodiment, the light display area is defined as the area in which light emitted from the lighting module 180 can be seen from the outside via the top plate 120, that is, the area in which light emitted from the lighting module 180 is irradiated onto the top plate 120, and is a defined part of the entire area of ​​the top plate 120.

[0130] For example, the light display area may be a virtual area designated as the portion on the top plate 120 that is illuminated by light emitted from the lighting module 180. In this case, the light display area is not a portion that is conspicuously displayed on the top plate 120 by methods such as performing a separate surface treatment on the surface of the top plate 120, but simply corresponds to a virtual area.

[0131] As another example, the light display area may be an area that is conspicuously displayed on the top plate 120 by methods such as performing a separate surface treatment on the surface of the top plate 120.

[0132] The lighting module 180 may include a light source. For example, an LED may be used as the light source, but the types of light sources that can be used are not limited to LEDs.

[0133] The lighting module 180 may contain multiple light sources, and each lighting module 180 may have multiple light sources arranged at predetermined intervals in the front-to-back direction. For example, the lighting module 180 may be provided in a form in which multiple light sources are mounted on a PCB. The number of light sources in each lighting module 180 and the length of the PCB in the front-to-back direction may be appropriately set according to the size and intensity of the lighting to be realized by the lighting module 180.

[0134] Furthermore, multiple lighting modules 180 may be arranged on the cooktop, and these multiple lighting modules 180 may be spaced apart at predetermined intervals in the lateral direction. The number of lighting modules 180 and the spacing between them may be appropriately set considering the size and number of heating coils, the spacing between heating coils, etc.

[0135] At least a portion of the lighting module 180 may be placed between the supporter 150 and the bottom 111. For example, the lighting module 180 may be placed in the housing space. More specifically, the lighting module 180 may be placed in the space enclosed by the bottom 111 of the case 110 and the supporter 150.

[0136] Various electrical components may be installed inside the cooktop 100, i.e., in the storage space. For example, the main PCB 171, switching mode power supply (SMPS) 162, inverter PCB 163, resonant PCB 164, noise filter (EMI filter) 165, fan 176, etc. may be placed inside the cooktop 100.

[0137] Hereinafter, the aforementioned electrical components will be collectively referred to as the electrical unit 170. The electrical unit 170 may include at least one of a power supply processing unit and a coil control unit. The power supply processing unit is provided to supply power to the heating coil assembly 1000, and may include a switching mode power supply device (SMPS) 162, a noise filter (EMI filter) 165, etc. The coil control unit is provided to control the operation of the heating coil assembly 1000, and may include an inverter PCB 174, etc.

[0138] [General structure of the heating coil assembly] Figure 6 is a schematic diagram showing the configuration of the heating coil assembly shown in Figure 4, and Figure 7 is a schematic cross-sectional view showing the stacked structure of the coil module shown in Figure 6.

[0139] Referring to Figures 4 and 6, the heating coil assembly 1000 may include a plurality of heating coils (WC) arranged in the lateral direction. For example, in the heating coil assembly 1000, the plurality of heating coils (WC) may be arranged along a first direction, i.e., the lateral direction, and the plurality of heating coils (WC) may also be arranged in a second direction, i.e., the front-to-back direction.

[0140] The heating coil assembly 140 may include at least one coil module 1001, 1003. In this embodiment, the heating coil assembly 140 is exemplified as including a plurality of coil modules 1001, 1003.

[0141] For example, the heating coil assembly 140 may include a plurality of coil modules 1001, 1003 arranged in the lateral direction. For instance, the heating coil assembly 140 may include a plurality of coil modules 1001, 1003 arranged in the first direction.

[0142] Each coil module 1001, 1003 may have multiple heating coils (WC) arranged laterally, as shown in Figures 6 and 7. Each heating coil (WC) may be provided in the form of a spiral coil formed as a pattern on a printed circuit board. That is, the heating coil 142 may be provided in the form of a pattern formed on the coil modules 1001, 1003.

[0143] Each coil module 1001, 1003 may include a coil substrate laminate 1010. The coil substrate laminate 1010 may include a plurality of first coil substrate sections 1100 stacked in the vertical direction.

[0144] Each first coil substrate portion 1100 may include a first coil portion 1120. For example, the first coil portion 1120 may be formed as a result of patterning a metal foil laminated on the surface of the first coil substrate portion 1100 into a spiral coil shape.

[0145] In this embodiment, multiple first coil substrates 1100 are stacked vertically to form a single coil module 1001, 1003, thereby allowing multiple first coils 1120 to be stacked vertically. The multiple first coils 1120 stacked vertically can then be connected to each other vertically to form a single heating coil (WC).

[0146] Furthermore, each first coil substrate portion 1100 may have multiple first coil portions 1120 arranged laterally, so that the coil modules 1001 and 1003 may include multiple heating coils (WC) arranged laterally.

[0147] Furthermore, the heating coil assembly 1000 of this embodiment may include a sensing coil (SC) for sensing the presence of an object to be heated, as shown in Figures 6 and 7. Each coil module 1001, 1003 may include a plurality of sensing coils (SC) arranged in the lateral direction. For example, in the heating coil assembly 1000, a plurality of sensing coils (SC) may be arranged along a first direction, i.e., the lateral direction, and a plurality of sensing coils (SC) may also be arranged in a second direction, i.e., the front-to-back direction.

[0148] Each sensing coil (SC) may be provided in the form of a spiral coil formed as a pattern on a printed circuit board. That is, the sensing coils (SC) may be provided in the form of patterns formed on coil modules 1001 and 1003.

[0149] According to this embodiment, the coil substrate laminate 1010 may include at least one second coil substrate portion 1200. The second coil substrate portion 1200 may be stacked vertically together with the first coil substrate portion 1100. That is, at least one second coil substrate portion 1200 and a plurality of first coil substrate portions 1100 can be stacked vertically to form a single coil module 1001, 1003. In this way, in each coil module 1001, 1003, at least a portion of the heating coil (WC) and the sensing coil (SC) may be arranged vertically.

[0150] Each second coil substrate portion 1200 may include a second coil portion 1220. For example, the second coil portion 1220 may be formed as a result of patterning a metal foil laminated on the surface of the second coil substrate portion 1200 into a spiral coil shape.

[0151] Each sensing coil (SC) may be formed by a single second coil section 1220, and may be formed as a result of multiple second coil sections 1220 stacked in the vertical direction and connected in the vertical direction.

[0152] Furthermore, each second coil substrate portion 1200 may have multiple second coil portions 1220 arranged laterally, so that the coil modules 1001 and 1003 may include multiple sensing coils (SC) arranged laterally.

[0153] Furthermore, the heating coil assembly 1000 of this embodiment may further include a temperature sensor (TS). The temperature sensor (TS) is provided for measuring the temperature of the object to be heated and may be located on the second coil substrate portion 1200.

[0154] The temperature sensor (TS) may be positioned laterally inside the sensing coil (SC). For example, although the temperature sensor (TS) is installed on the second coil substrate 1200, it may be positioned within the area enclosed by the sensing coil (SC).

[0155] [Coil module arrangement structure] Figure 8 is a plan view showing a first example of the arrangement structure of the first and second coil modules, and Figure 9 is a schematic diagram showing an example of the cutting state of the raw material to form the first coil substrate. Figure 10 is a plan view showing a second example of the arrangement structure of the first and second coil modules, Figure 11 is a plan view showing another example of the arrangement structure of the first and second coil modules shown in Figure 8, and Figure 12 is a plan view showing another example of the arrangement structure of the first and second coil modules shown in Figure 10. Figure 13 is a plan view showing a third example of the arrangement structure of the first and second coil modules, and Figure 14 is a plan view showing a fourth example of the arrangement structure of the first and second coil modules. Figure 15 is a plan view showing a fifth example of the arrangement structure of the first and second coil modules, and Figure 16 is a plan view showing a sixth example of the arrangement structure of the first and second coil modules.

[0156] Referring to Figures 4 and 8, the heating coil assembly 1000 of this embodiment includes a plurality of coil modules 1001, 1003, and the plurality of coil modules 1001, 1003 may be arranged along the lateral direction in the heating coil assembly 1000. For example, the plurality of coil modules 1001, 1003 may be arranged along the first direction in the heating coil assembly 1000.

[0157] As described above, the cooktop 100 in this embodiment may include a cooktop control panel 130. The cooktop control panel 130 is positioned on the top plate 120, but may be positioned in a forward-biased position.

[0158] With respect to the first direction, the cooktop control panel 130 may be positioned approximately in the center of the heating coil assembly 1000. With respect to the second direction, the cooktop control panel 130 may be positioned off-center towards the front of the heating coil assembly 1000.

[0159] The heating coil assembly 1000 is positioned below the top plate 120, but not below the area of ​​the top plate 120 occupied by the cooktop control panel 130. In other words, the heating coil (WC) is positioned only below the area of ​​the top plate 120 not occupied by the cooktop control panel 130, and not below the area of ​​the top plate 120 occupied by the cooktop control panel 130.

[0160] These heating coil assemblies 1000 may include multiple types of coil modules 1001, 1003 of different sizes. In this embodiment, the coil modules 1001, 1003 are exemplified as including a first coil module 1001 and a second coil module 1003. In this case, the first coil module 1001 includes multiple heating coils (WC), and the second coil module 1003 includes fewer heating coils (WC) than the first coil module 1001.

[0161] In this embodiment, the first coil module 1001 and the second coil module 1003 in the heating coil assembly 1000 may be arranged along the lateral direction. Furthermore, the length of the second coil module 1003 may be shorter than the length of the first coil module 1001 in the second direction. That is, the second coil module 1003 may be shorter than the first coil module 1001 in the second direction and may be provided in a form containing fewer heating coils (WC).

[0162] In the heating coil assembly 1000, a pair of first coil modules 1001 and at least one second coil module 1003 may be arranged along a first direction. In this case, the pair of first coil modules 1001 may be spaced apart along the first direction. And at least one second coil module 1003 may be placed between the pair of first coil modules 1001.

[0163] For example, at least one second coil module 1003 may be positioned in the center of the heating coil assembly 1000 in a first direction, similar to the cooktop control panel 130. These at least one second coil module 1003 and the cooktop control panel 130 may be positioned collinearly in a second direction.

[0164] In the first direction, the cooktop control panel 130 may be positioned between the pair of first coil modules 1001. In the second direction, the cooktop control panel 130 may be positioned to one side of the second coil module 1003, for example, in front of the second coil module 1003. As a result, at least a portion of the cooktop control panel 130 may be positioned within the area enclosed by the pair of first coil modules 1001 and the second coil module 1003.

[0165] In other words, the cooktop control panel 130 is positioned so that the visual information provided through the cooktop control panel 130 is clearly visible to the user, and so that the user can easily operate the cooktop control panel 130. These cooktop control panels 130 occupy a predetermined area on the upper surface of the cooktop 100.

[0166] Furthermore, since the heating coil (WC) cannot be placed in the area occupied by the cooktop control panel 130 on the upper surface of the cooktop 100, the heating coil (WC) must be placed in the remaining area excluding the area occupied by the cooktop control panel 130. As a result, the heating coil assembly 1000, which includes the heating coil (WC), is placed in the area on the upper surface of the cooktop 100 that is not occupied by the cooktop control panel 130. For example, the lateral outer shape of the heating coil assembly 1000 may be formed as an inverted "concave" shape.

[0167] The heating coil assembly 1000 includes coil modules 1001 and 1003 equipped with heating coils (WC), but may also include multiple types of coil modules 1001 and 1003 having different lengths in the second direction. In this embodiment, the heating coil assembly 1000 is exemplified as including two types of coil modules 1001 and 1003, namely a first coil module 1001 and a second coil module 1003.

[0168] As an example, the lateral outer shape of coil modules 1001 and 1003 (hereinafter referred to as "coil module outer shape") may be formed as a rectangle. That is, the outer shapes of the first coil module 1001 and the second coil module 1003 may each be formed as rectangles.

[0169] For example, the shape of the second coil module 1003 may be a rectangle with a different length in the second direction compared to the first coil module 1001. The second coil module 1003 and the cooktop control panel 130 may be arranged on the same straight line in the second direction, and the second coil module 1003 may be positioned behind the cooktop control panel 130.

[0170] Considering that the second coil module 1003 is positioned collinearly with the cooktop control panel 130 in the second direction, the length of the second coil module 1003 in the second direction is set to be shorter than the length of the first coil module 1001 in the second direction.

[0171] As described above, the heating coil assembly 1000 consists of a combination of multiple coil modules 1001, 1003 arranged in the horizontal direction, and each coil module 1001, 1003 may be formed in a rectangular shape. In other words, the heating coil assembly 1000 is not formed by a single coil module formed in the shape of an inverted "concave," but may be formed by a combination of multiple rectangular coil modules 1001, 1003.

[0172] According to this embodiment, as shown in Figures 8 and 9, the first coil substrate portion 1100 forming each coil module 1001, 1003 may be formed from a copper clad laminate (CCL), and each copper clad laminate forming each first coil substrate portion 1100 may be provided as a result of cutting a raw copper clad laminate (B; hereinafter referred to as "raw plate").

[0173] When the first coil substrate portion 1100 is formed in a concave shape or an inverted concave shape, when the first coil substrate portion 1100 is manufactured by cutting the raw material (P), a loss of raw material (P) is unavoidable due to the portion cut out to secure space for the placement of the cooktop control panel 130. In other words, when the heating coil assembly 1000 is formed by a single coil module 1001, 1003, a problem arises in which the loss of raw material (P) used in the manufacture of the first coil substrate portion 1100 increases.

[0174] In contrast, if the heating coil assembly 1000 consists of a combination of multiple coil modules 1001 and 1003, each coil module 1001 and 1003 can be formed in a rectangular shape. That is, the heating coil assembly 1000 may be formed in a "concave" shape or an inverted "concave" shape by a combination of multiple types of coil modules 1001 and 1003 of different sizes, for example, a combination of a first coil module 1001 and a second coil module 1003.

[0175] As a result, when the raw material (P) is cut to manufacture the first coil substrate section 1100, the raw material (P) can be cut into a rectangular shape, thereby effectively reducing the loss of the raw material (P) used in the manufacture of the first coil substrate section 1100.

[0176] According to this embodiment, the heating coil (WC) may be formed in a shape that includes polygons. For example, the lateral outer shape of the heating coil (WC) (hereinafter referred to as the "outer shape of the heating coil") may be polygonal.

[0177] For example, the outer shape of the heating coil (WC) may be roughly rectangular, and the lateral outer shape of the cooktop 100 (hereinafter referred to as the "cooktop outer shape") is also close to a rectangle. Considering these points, it is preferable that the lateral outer shapes of the coil modules 1001 and 1003 (hereinafter referred to as the "coil module outer shapes") be rectangular.

[0178] By forming the outer shape of coil modules 1001 and 1003 into a rectangle similar to the outer shape of the heating coil (WC), the density of the area occupied by the heating coil (WC) within coil modules 1001 and 1003 is effectively increased. Furthermore, by forming the outer shape of coil modules 1001 and 1003 into a rectangle similar to the outer shape of the cooktop 100, the density of the area occupied by coil modules 1001 and 1003 within the cooktop 100 is effectively increased.

[0179] In other words, by forming the outer shapes of the coil modules 1001 and 1003 in a polygonal shape similar to the outer shapes of the heating coil (WC) and the cooktop 100, the density of the area occupied by the heating coil (WC) within the cooktop 100 is effectively increased, thereby effectively increasing the width of the area that can be heated for the food being cooked within the cooktop 100.

[0180] This allows the heating efficiency of the cooktop 100 to be effectively improved by increasing the width of the area in contact with the heating coil (WC) within the cooktop 100.

[0181] On the other hand, the difference in length between the first coil module 1001 and the second coil module 1003 along the second direction can be adjusted by the difference in the number of heating coils (WC) along the second direction. For example, the first coil module 1001 and the second coil module 1003 may both be provided with heating coils (WC) of the same size and shape, and the number of heating coils (WC) along the second direction in the second coil module 1003 may be set to be one or more fewer than the number of heating coils (WC) along the second direction in the first coil module 1001.

[0182] In this way, by adjusting the number of heating coils (WC), the lengths of the first coil module 1001 and the second coil module 1003 are set to be different. This eliminates the need to design different sizes and shapes for the heating coils (WC) to match the different sizes of the coil modules 1001 and 1003. In other words, multiple types of coil modules 1001 and 1003 with different lengths in the second direction can all be provided in a form that includes only one type of heating coil (WC).

[0183] This not only reduces the cost and time required to design the heating coil (WC), but also allows for the manufacture of multiple types of coil modules 1001, 1003 with different lengths in the second direction at an even lower cost, more easily and quickly.

[0184] In this embodiment, the cooktop control panel 130 and the second coil module 1003 are positioned in the center of the upper surface of the cooktop 100 in the first direction, and the first coil modules 1001 may be positioned on both sides of the upper surface of the cooktop 100 in the first direction.

[0185] For example, the length of the first coil module 1001 in the second direction may be set to be approximately the same as the length of the upper surface of the cooktop 100 in the second direction. Furthermore, the difference in length between the first coil module 1001 and the second coil module 1003 in the second direction may be set to be greater than or equal to the length of the heating coil (WC) in the second direction.

[0186] This ensures that heating coils (WC) fill most of the upper surface of the cooktop 100, while also ensuring that there is enough space on the upper surface of the cooktop 100 for the cooktop control panel 130.

[0187] As an example, in the heating coil assembly 1000, a pair of first coil modules 1001 and one second coil module 1003 may be arranged along a first direction. In this case, the pair of first coil modules 1001 may be spaced apart along the first direction. And the one second coil module 1003 may be placed between the pair of first coil modules 1001.

[0188] For example, one second coil module 1003 may be positioned in the center of the heating coil assembly 1000 in the first direction, similar to the cooktop control panel 130. These second coil modules 1003 and the cooktop control panel 130 may be positioned collinearly in the second direction.

[0189] In this case, the number of heating coils (WC) included in each first coil module 1001 and the number of heating coils (WC) included in each second coil module 1003 may be 8 and 6, respectively (see Figure 8), or they may be 6 and 4, respectively (see Figure 11).

[0190] As another example, in the heating coil assembly 1000a shown in Figure 10, two pairs of first coil modules 1001a and a pair of second coil modules 1003a may be arranged along a first direction. In this case, one pair of first coil modules 1001a may be placed on one side of the pair of second coil modules 1003a in the first direction, and the other pair of first coil modules 1001a may be placed on the other side of the pair of second coil modules 1003a in the first direction.

[0191] In this case, the number of heating coils (WC) included in each first coil module 1001a and the number of heating coils (WC) included in each second coil module 1003a may be 4 and 3, respectively (see Figure 10), or they may be 3 and 2, respectively (see Figure 12).

[0192] As yet another example, in the heating coil assembly 1000d shown in Figure 13, a pair of first coil modules 1001d and a pair of second coil modules 1003d may be arranged spaced apart along a first direction. The pair of second coil modules 1003d may be arranged between the pair of first coil modules 1001d.

[0193] As yet another example, in the heating coil assembly 1000e shown in Figure 14, two pairs of first coil modules 1001e and two pairs of second coil modules 1003e may be arranged along a first direction. In this case, one pair of first coil modules 1001e may be placed on one side of the two pairs of second coil modules 1003e in the first direction, and the other pair of first coil modules 1001e may be placed on the other side of the two pairs of second coil modules 1003e in the first direction.

[0194] Furthermore, as shown in Figure 15, only a pair of first coil modules 1001f may be arranged along the first direction, and as shown in Figure 16, only two pairs of first coil modules 1001g may be arranged along the first direction.

[0195] [Structure of the heating coil] Figure 17 is a plan view showing an example of a first coil substrate according to one embodiment of the present invention, Figure 18 is an enlarged view showing a part of the first coil substrate shown in Figure 17, and Figure 19 is a schematic cross-sectional view showing the laminated structure of the first coil shown in Figure 18. Furthermore, Figure 20 is a plan view showing an example of the arrangement structure of the sensing coil, and Figure 21 is an enlarged view of a part of Figure 20, showing an example of the arrangement structure of the sensing coil relative to the heating coil. Furthermore, Figure 22 is an enlarged view showing the first terminal shown in Figure 18, and Figure 23 is an enlarged view showing the second terminal shown in Figure 18.

[0196] In this embodiment, as shown in Figures 8 and 17-19, the heating coil (WC) may be formed from multiple layers of conductors, more specifically, from electrical conductors. In this embodiment, it is exemplified that the first coil portion 1120, or more specifically, the coil pattern (Cp) described later, is formed from a conductor.

[0197] A heating coil (WC) may be formed as a result of connecting a plurality of first coil substrates 1100 stacked vertically, each provided with a first coil portion 1120 in the vertical direction. Each first coil substrate 1100 may include a core 1110 and a first coil portion 1120.

[0198] The core 1110 forms the framework of the first coil substrate portion 1100 and may be made of an insulating material. For example, the core 1110 may be made of a prepreg material. In this embodiment, the core 1110 is exemplified as being made of a thermo-cured prepreg, more specifically, a prepreg that is FR4.

[0199] The first coil sections 1120 may be arranged on both the vertical and horizontal sides of the core 1110. For example, each first coil substrate section 1100 may be provided in a form in which one first coil section 1120 is formed on each of the vertical and horizontal sides of the core 1110.

[0200] For example, the first coil portion 1120 may be provided in a form patterned on both the upper and lower sides of the core 1110. For instance, the first coil substrate portion 1100 may be formed from a copper foil laminate including the core 1110 and copper foil laminated on both the upper and lower sides of the core 1110. In this case, the first coil portion 1120 may be formed as a result of the foil laminated on the core 1110 being patterned in a coil shape.

[0201] According to this embodiment, the heating coil (WC) may be formed in a shape that includes polygons. For example, the lateral outer shape of the heating coil (WC) (hereinafter referred to as the "outer shape of the heating coil") may be polygonal.

[0202] Furthermore, the heating coil (WC) may be formed by a plurality of first coil substrate portions 1100 stacked in the vertical direction, as described above. The first coil substrate portions 1100 may include a patterned area 1101 and non-patterned areas 1103, 1105.

[0203] The patterned area 1101 corresponds to the area of ​​the first coil substrate 1100 where the first coil portion 1120 is arranged. The non-patterned areas 1103 and 1105 correspond to the areas of the first coil substrate 1100 where the first coil portion 1120 is not arranged. The patterned area 1101 and the non-patterned areas 1103 and 1105 may be arranged on the same plane and aligned laterally.

[0204] The non-patterned regions 1103 and 1105 may include the first non-patterned region 1103. The first non-patterned region 1103 in each heating coil (WC) may be located in the lateral center. Alternatively, the first non-patterned region 1103 may be located in the lateral center of the first coil substrate portion 1100.

[0205] For example, the first non-patterned area 1103 may be positioned in the lateral center of each heating coil (WC) and the first coil substrate portion 1100. The patterned area 1101 may be positioned to surround the first non-patterned area 1103 on the lateral outside.

[0206] In this embodiment, the term "center" does not mean the exact center, but rather the region enclosed by the spirally wound heating coil (WC), and includes the diametrical center of the heating coil (WC) and its periphery.

[0207] At least a portion of the first coil portion 1120 can surround the non-patterned regions 1103 and 1105 from the outside in the lateral direction. For example, at least a portion of the first coil portion 1120 can surround the first non-patterned region 1103 from the outside in the lateral direction.

[0208] These first coil portions 1120 may include at least one coil pattern (Cp) located laterally outside the first non-patterned region 1103. In each first coil portion 1120, each coil pattern (Cp) may be wound multiple times around the first non-patterned region 1103. The first coil portion 1120 may be formed by at least one coil pattern (Cp) provided in these configurations.

[0209] Each first coil section 1120 may include a plurality of coil patterns (Cp). In this case, in each first coil section 1120, the plurality of coil patterns (Cp) may be arranged along the diametrical direction of the heating coil (WC) at predetermined intervals from each other.

[0210] For example, each first coil section 1120 may contain 3 to 6 coil patterns (Cp). However, the present invention is not limited thereto, and each coil section 112 may contain more than 6 coil patterns (Cp).

[0211] In this embodiment, each first coil section 1120 is exemplified as containing three to six coil patterns (Cp). In this case, in each first coil section 1120, the three to six coil patterns (Cp) may be arranged along the diametrical direction of the heating coil (WC). The coil patterns (Cp) arranged in each first coil section 1120 may be vertically connected to any of the coil patterns arranged in other vertically adjacent first coil sections 1120.

[0212] Furthermore, the first coil substrate portion 1100 may further include a second non-patterned region 1105. The second non-patterned region 1105 corresponds to a region where the first coil portion 1120 is not formed, similar to the first non-patterned region 1103.

[0213] With respect to the lateral direction, the second non-patterned region 1105 may be positioned outside the first non-patterned region 1103. In this embodiment, it is exemplified that the second non-patterned region 1105 is positioned outside the first non-patterned region 1103 in the first direction.

[0214] Furthermore, the first non-patterned region 1103 and the second non-patterned region 1105 are not connected laterally in each first coil substrate portion 1100. Laterally, at least a portion of the sensing coil (SC) may be positioned between the first non-patterned region 1103 and the second non-patterned region 1105. That is, at least a portion of the first coil portion 1120 may be positioned between the first non-patterned region 1103 and the second non-patterned region 1105.

[0215] In this embodiment, multiple second non-pattern regions 1105 may be arranged along the first direction for each heating coil (WC). For example, a pair of second non-pattern regions 1105 may be arranged for each heating coil (WC). These pairs of second non-pattern regions 1105 may be arranged outside the first non-pattern region 1103 in the first direction. That is, the first non-pattern region 1103 may be arranged between the pair of second non-pattern regions 1105 with respect to the first direction.

[0216] Furthermore, according to this embodiment, a plurality of heating coils (WC) may be arranged along the first direction. The plurality of second non-pattern regions 1105 provided on the plurality of heating coils (WC) arranged in this manner may be arranged at equal intervals along the first direction.

[0217] On the other hand, as shown in Figures 6 and 7, a second coil substrate portion 1200 may be arranged above or below the first coil substrate portion 1100, and a sensing coil (SC) may be formed by this second coil substrate portion 1200. The sensing coil (SC) is arranged above or below the first coil substrate portion 1100 and is positioned in a region that overlaps the first coil substrate portion 1100 in the vertical direction.

[0218] In each coil module 1001, 1003, the sensing coil (SC) may be positioned vertically outside the heating coil (WC), as shown in Figures 6-7 and 20-21. For example, in each coil module 1001, 1003, the sensing coil (SC) and the heating coil (WC) may be arranged vertically.

[0219] In the lateral direction, at least a portion of the sensing coil (SC) may be arranged in the second non-patterned region 1105. Therefore, by arranging multiple second non-patterned regions 1105 at equal intervals along the first direction, multiple sensing coils (SC) can be arranged at equal intervals along the first direction.

[0220] As described above, by arranging multiple second non-patterned regions 1105 at equal intervals along the first direction, multiple sensing coils (SCs) can be arranged at equal intervals along the first direction. According to this embodiment, at least a portion of each sensing coil (SC) may be arranged in the second non-patterned regions 1105. Therefore, when multiple second non-patterned regions 1105 are arranged at equal intervals along the first direction, multiple sensing coils (SCs) can be arranged at equal intervals along the first direction.

[0221] According to this embodiment, the temperature sensor (TS) may be positioned laterally inside the sensing coil (SC). Laterally, at least a portion of the temperature sensor (TS) may be positioned in the second non-patterned region 1105.

[0222] For example, the temperature sensor (TS) may be placed in the second non-patterned region 1105. That is, the temperature sensor (TS) installed on the second coil substrate portion 1200 and the second non-patterned region 1105 formed on the first coil substrate portion 1100 may be arranged to overlap in the vertical direction.

[0223] Therefore, each sensing coil (SC) may be positioned so that the entire temperature sensor (TS) can be placed in the second non-pattern region 1105, that is, in a position where the entire temperature sensor (TS) can overlap the second non-pattern region 1105 in the vertical direction.

[0224] On the other hand, each first coil section 1120 may include a first terminal 1121 and a second terminal 1122, as shown in Figures 17-18 and 22-23. The first terminal 1121 and the second terminal 1122 are provided so as to be able to connect multiple coil patterns (Cp) arranged laterally, that is, multiple coil patterns (Cp) that form one first coil section 1120.

[0225] Laterally, the first terminal 1121 is positioned outside the first non-patterned area 1103 and the second terminal 1122, and at least a portion of the second terminal 1122 may be positioned adjacent to the first non-patterned area 1103. In this case, laterally, the second non-patterned area 1105 may be positioned between the first terminal 1121 and the second terminal 1122.

[0226] Furthermore, with respect to the second non-pattern region 1105, the first terminal 1121 may be positioned in the lateral outer region of the first coil portion 1120, and the second terminal 1122 may be positioned in the lateral inner region of the first coil portion 1120.

[0227] For example, the first terminal 1121 may be located on the outermost lateral side of the first coil section 1120, and the second terminal 1122 may be located on the innermost lateral side of the first coil section 1120. For instance, the first terminal 1121 may be connected to the outermost lateral end of the coil pattern (Cp), and the second terminal 1122 may be connected to the innermost end of the coil pattern (Cp).

[0228] Referring to Figures 6 and 20, the heating coil assembly 1000 of this embodiment may further include a terminal section 1020. The terminal section 1020 is provided so as to be connectable to at least one of the first terminal 1121 and the second terminal 1122. A detailed explanation of the terminal section 1020 will be given later.

[0229] [Arrangement structure of heating coils by coil module] As shown in Figure 8, each coil module 1001, 1003 may have multiple heating coils (WC) arranged laterally. For example, each coil module 1001, 1003 may have multiple heating coils (WC) arranged along a first direction and also along a second direction. That is, each coil module 1001, 1003 may have multiple heating coils (WC) arranged in a matrix.

[0230] In this case, each heating coil (WC) may be arranged at a predetermined distance in the first direction from other heating coils (WC) adjacent in the first direction, and at a predetermined distance in the second direction from other heating coils (WC) adjacent in the second direction.

[0231] According to this embodiment, the lengths of the coil modules 1001 and 1003 along the first direction may be set to be shorter than the lengths of the coil modules 1001 and 1003 along the second direction. That is, although each coil module 1001 and 1003 is formed as a rectangle, it may be formed as a rectangle in which the length in the second direction is longer than the length in the first direction.

[0232] In contrast, the length of the heating coil (WC) along the second direction may be set shorter than the length of the heating coil (WC) along the first direction. That is, although each heating coil (WC) is formed in a rectangular shape, it may be formed in a rectangle in which the length in the first direction is longer than the length in the second direction.

[0233] In each of the coil modules 1001 and 1003 that include these heating coils (WC), the number of heating coils (WC) arranged in the same straight line in the second direction is greater than the number of heating coils (WC) arranged in the same straight line in the first direction.

[0234] In this embodiment, the first coil module 1001 may include a plurality of heating coils (WC) arranged in the form of A columns * B rows, and the second coil module 1003 may each include a plurality of heating coils (WC) arranged in the form of A columns * C rows. In this embodiment, a column is defined as a column along the first direction, and a row is defined as a row along the second direction.

[0235] As an example, the relationship between A, B, and C can be defined as follows:

[0236] A≧1, C≧2, B>C,

[0237] For example, in the first coil module 1001 and the second coil module 1003, one or more heating coils (WC) may be arranged in the first direction and two or more in the second direction. Also, in the first coil module 1001, one or more heating coils (WC) may be arranged in the first direction and three or more in the second direction.

[0238] According to this, the number of heating coils (WC) arranged on the same straight line in the first direction in the first coil module 1001 and the number of heating coils (WC) arranged on the same straight line in the first direction in the second coil module 1003 may be set to be the same. Further, the number of heating coils (WC) arranged on the same straight line in the second direction in the second coil module 1003 may be set to be smaller than the number of heating coils (WC) arranged on the same straight line in the second direction in the first coil module 1001.

[0239] As an example, when n first coil modules 1001 are arranged spaced apart along the first direction, n / 2 second coil modules 1003 may be arranged between the pair of first coil modules 1001 arranged on the innermost side in the first direction.

[0240] At this time, each of the first coil modules 1001 may respectively include 16 / n heating coils (WC) arranged in a form of 4 / n columns * 4 rows. And each of the second coil modules 1003 may respectively include 12 / n heating coils (WC) arranged in a form of 4 / n columns * 3 rows.

[0241] For example, when two first coil modules 1001 are arranged spaced apart along the first direction, one second coil module 1003 may be arranged between the pair of first coil modules 1001 arranged on the innermost side in the first direction. At this time, each of the first coil modules 1001 may respectively include 8 heating coils (WC) arranged in a form of 2 columns * 4 rows.

[0242] And each of the second coil modules 1003 may respectively include 6 heating coils (WC) arranged in a form of 2 columns * 3 rows. In this case, the heating coil assembly 1000 may include a total of 22 heating coils (WC).

[0243] As described above, the cooktop 100 (see FIG. 3) is provided with a plurality of indicator lights (L; see FIG. 3), and these indicator lights (L) may be implemented by the lighting module 180 (see FIG. 4). The lighting module 180 is disposed below the heating coil assembly 1000, and light emitted from the lighting module 180 can pass through the heating coil assembly 1000 to illuminate the light display area of the top plate 120.

[0244] To allow light emitted from the lighting module 180 to pass through to the light display area of the top plate 120, each of the coil modules 1001 and 1003 may be provided with a through hole (h). In each of the coil modules 1001 and 1003, the through hole (h) can penetrate the coil modules 1001 and 1003 in the vertical direction, and each through hole (h) may be disposed between one row of heating coils (WC) and another row of heating coils (WC).

[0245] If, as shown in FIG. 10, four first coil modules 1001a are arranged spaced apart along the first direction, two second coil modules 1003a may be disposed between the pair of first coil modules 1001a arranged at the innermost side in the first direction. At this time, each of the first coil modules 1001a may include four heating coils (WC) arranged in a form of 1 column * 4 rows.

[0246] When the heating coil assembly 1000a is provided in the form as described above, spaces can be formed between each row of the heating coil assembly 1000a. These spaces can be used as passages for allowing light emitted from the lighting module 180 to pass through to the light display area of the top plate 120.

[0247] That is, by providing each of the coil modules 1001a and 1003a in a form including only one row of heating coils (WC), there is no need to separately form through holes in the heating coil assembly 1000a.

[0248] Furthermore, considering that the size, display, or control panel may differ for each model, the heating coil assembly 1000a provided in the above configuration is more advantageous for mass production compared to the heating coil assembly shown in Figure 8.

[0249] For example, with the heating coil assembly 1000a provided in the form described above, when producing multiple products with different display or control panel sizes, only the size of the second coil module 1003a needs to be changed according to the size of the display or control panel, and the first coil module 1001a can be used in common.

[0250] Furthermore, with the heating coil assembly 1000a provided in the form described above, only one row at a time needs to be repaired or replaced for each coil module 1001a, 1003a when necessary, which simplifies maintenance and reduces maintenance costs.

[0251] Furthermore, as described above, if each coil module 1001a, 1003a is provided in a configuration that includes only one row of heating coils (WC), the surface area of ​​the coil modules 1001a, 1003a becomes relatively larger compared to a configuration in which each coil module includes two rows of heating coils (WC). In addition, air can flow in the space between each coil module 1001a, 1003a, thereby improving the heat dissipation performance of the heating coil assembly 1000a.

[0252] In contrast, as shown in Figure 8, when two or more rows of heating coils (WC) are arranged in each coil module 1001, 1003, the number of coil modules 1001, 1003 to be assembled is reduced compared to when only one row of heating coils (WC) is arranged in each coil module, thus reducing the assembly man-hours.

[0253] Furthermore, when two or more rows of heating coils (WC) are arranged in each coil module 1001, 1003, the space necessary to form wiring between two adjacent rows of heating coils (WC) can be easily secured in the coil modules 1001, 1003, which has the advantage of making wiring design easier and more efficient.

[0254] Furthermore, each second coil module 1003a may contain three heating coils (WC) arranged in a 1x3 configuration. In this case as well, the heating coil assembly 1000a may contain a total of 22 heating coils (WC).

[0255] As a second example, as shown in Figure 11, each first coil module 1001b may contain 12 / n heating coils (WC) arranged in a 4 / n column * 3 row configuration. And each second coil module 1003b may contain 8 / n heating coils (WC) arranged in a 4 / n column * 2 row configuration.

[0256] For example, if two first coil modules 1001b are arranged spaced apart along a first direction, one second coil module 1003b may be placed between a pair of first coil modules 1001b located on the innermost side in the first direction. In this case, each first coil module 1001b may contain six heating coils (WC) arranged in a 2x3 configuration.

[0257] Furthermore, each second coil module 1003b may contain four heating coils (WC) arranged in a 2x2 configuration. In this case, the heating coil assembly 1000b may contain a total of 16 heating coils (WC).

[0258] If, as shown in Figure 12, four first coil modules 1001c are arranged spaced apart along a first direction, then two second coil modules 1003c may be arranged between a pair of first coil modules 1001c located on the innermost side in the first direction.

[0259] In this case, each first coil module 1001c may contain three heating coils (WC) arranged in a 1x3 configuration. Each second coil module 1003c may contain two heating coils (WC) arranged in a 1x2 configuration. In this case as well, the heating coil assembly 1000c may contain a total of 16 heating coils (WC).

[0260] As a third example, as shown in Figure 13, when two first coil modules 1001d are arranged spaced apart along a first direction, two second coil modules 1003d may be arranged between a pair of first coil modules 1001d that are positioned furthest in the first direction. In this case, each first coil module 1001d may contain 10 heating coils (WC) arranged in a 2x5 configuration.

[0261] Furthermore, each second coil module 1003d may contain six heating coils (WC) arranged in a 2x3 configuration. In this case, the heating coil assembly 1000d may contain a total of 32 heating coils (WC).

[0262] As a fourth example, if four first coil modules 1001e are arranged spaced apart along a first direction, as shown in Figure 14, then four second coil modules 1003e may be arranged between a pair of first coil modules 1001e located on the innermost side in the first direction. In this case, each first coil module 1001e may contain five heating coils (WC) arranged in a 1x5 configuration.

[0263] Then, each of the second coil modules 1003e may include three heating coils (WC) arranged in a form of 1 column * 3 rows. Also in this case, the heating coil assembly 1000e may include a total of 32 heating coils (WC).

[0264] As a fifth example, as shown in FIG. 15, when n first coil modules 1001f are arranged spaced apart along the first direction, each of the first coil modules 1001f may include 16 / n heating coils (WC) arranged in a form of 4 / n columns * 4 rows.

[0265] For example, when two first coil modules 1001f are arranged spaced apart along the first direction, each of the first coil modules 1001f may include 8 heating coils (WC) arranged in a form of 2 columns * 4 rows. In this case, the heating coil assembly 1000f may include a total of 16 heating coils (WC).

[0266] As an example, as shown in FIG. 16, if four first coil modules 1001g are arranged spaced apart along the first direction, each of the first coil modules 1001g may include four heating coils (WC) arranged in a form of 1 column * 4 rows. Also in this case, the heating coil assembly 1000g may include a total of 16 heating coils (WC).

[0267] In the examples as described above, all of the heating coil assemblies may include heating coils (WC) of the same size and shape. Alternatively, the heating coil assembly may include a plurality of types of heating coils (WC) having different sizes and shapes from each other.

[0268] FIG. 24 is a plan view showing a seventh example of the arrangement structure of the first coil module and the second coil module.

[0269] As yet another example, the heating coil assembly 1000h shown in Figure 24 may further include at least one of the third coil module 1005 and the fourth coil module 1007. The first coil module 1001 and the third coil module 1005 may be arranged collinearly in the second direction, and the second coil module 1003 and the fourth coil module 1007 may be arranged collinearly in the second direction.

[0270] According to this, a pair of first coil modules 1001 may be arranged spaced apart along the first direction via a second coil module 1003 and a fourth coil module 1007.

[0271] Furthermore, with respect to the second direction, the first coil module 1001 may protrude further to one side than the second coil module 1003, the third coil module 1005 may be positioned even more to one side than the first coil module 1001, and the fourth coil module 1007 may be positioned even more to one side than the second coil module 1003.

[0272] In other words, the first coil module 1001, which is longer in the second direction than the second coil module 1003, may protrude further forward than the second coil module 1003, the third coil module 1005 may be positioned further forward than the first coil module 1001, and the fourth coil module 1007 may be positioned further forward than the second coil module 1003. It goes without saying that the third coil module 1005 is positioned further forward than the fourth coil module 1007.

[0273] The third coil module 1005 and the fourth coil module 1007 may be formed to be smaller in the lateral direction than the first coil module 1001 and the second coil module 1003. For this reason, the third coil module 1005 may include a heating coil that is smaller in the lateral direction than the heating coil provided in the first coil module 1001.

[0274] As described above, the cooktop control panel 130 may be positioned further forward than the second coil module 1003, and the pair of first coil modules 1001 may be spaced apart along the first direction via the cooktop control panel 130. Furthermore, the pair of third coil modules 1005, positioned in front of the pair of first coil modules 1001, may also be spaced apart along the first direction via the cooktop control panel 130.

[0275] The length of the third coil module 1005 may be set shorter than the length of the first coil module 1001 in the first direction. Similarly, the length of the third coil module 1005 may be set shorter than the length of the first coil module 1001 in the second direction. In other words, the third coil module 1005 may be formed to be shorter than the first coil module 1001 in both the first and second directions.

[0276] Furthermore, the fourth coil module 1007 may be positioned behind the cooktop control panel 130. With respect to the second direction, the fourth coil module 1007 may be positioned between the cooktop control panel 130 and the second coil module 1003, and the length of these fourth coil modules 1007 may be shorter than the length of the second coil module 1003.

[0277] By arranging the third coil module 1005 and the fourth coil module 1007 in the configuration described above, it becomes possible to secure a wider area for the cooktop control panel 130. As a result, the cooktop control panel 130 can be further separated laterally from the coil modules 1001 and 1003, and the cooktop control panel 130 will be slightly affected by the heat generated around the heating coil (WC).

[0278] [Configuration of power supply] Figure 25 is a schematic diagram showing the configuration of the power supply for a cooking appliance according to one embodiment of the present invention, and Figure 26 is a diagram illustrating the drive circuit and load circuit shown in Figure 25.

[0279] Referring to Figures 2 and 24, the cooking appliance according to this embodiment may include a cooktop control panel 130, a load circuit 350, and a drive circuit 300.

[0280] According to this embodiment, the cooktop control panel 130 may be provided with a user interface that includes various icons for adjusting the operation of the cooktop 100 by touch, as well as a display that shows the operating status of the cooktop 100. The user can input a target heating intensity via the cooktop control panel 130.

[0281] The load circuit 350 may include at least one heating coil, at least one capacitor, and at least one relay. Here, the at least one heating coil, at least one capacitor, and at least one relay may be selectively connected in series or in parallel.

[0282] The drive circuit 300 can supply drive current to the load circuit 350 by switching drive of the inverter circuit. These drive circuits 300 may also include a current converter 330 and a resonant voltage generator 340.

[0283] The current converter 330 generates a resonant current (Ir) based on the drive current, and the resonant voltage generator 340 can generate a resonant voltage (Vr) based on the AC voltage and the current converter 330. The current converter 330 and the resonant voltage generator 340 may be located inside the drive circuit 300 depending on the design.

[0284] Furthermore, the cooking appliance of this embodiment may further include a current measuring circuit 400. The current measuring circuit 400 can measure the input current applied to the load circuit 350 using the resonant current (Ir) and resonant voltage (Vr), and can measure the average input current by averaging the input currents.

[0285] Furthermore, the cooking appliance of this embodiment may further include a sensing coil (SC) and a controller 500.

[0286] The sensing coil (SC) can sense the presence of an object to be heated, and when the presence of an object to be heated is detected, it can provide a container sensing signal to the controller 500. The sensing coil (SC) can either store oscillation energy in itself or output a freely resonant oscillation signal according to the control of the controller 500. These sensing coils (SC) can filter the DC component in the oscillation signal, compare the filtered oscillation signal with a reference signal, and output a container sensing signal based on the comparison result to the controller 500.

[0287] The controller 500 can control the drive circuit 300 to drive the load circuit 350 with a target intensity received from the cooktop control panel 130. These controllers 500 can control the switching of the switching elements of the drive circuit 300.

[0288] The controller 500 measures the power of the load circuit 350 based on the average input current received from the current measurement circuit 400, and can determine the switching frequency so that the target heating intensity is maintained according to the power of the load circuit 350. These controllers 500 control the switching drive of the inverter circuit of the drive circuit 300 based on the switching frequency.

[0289] The controller 500 can determine container information, including at least one of the container's location, material, shape, and size, based on a container sensing signal received from the sensing coil (SC). These controllers 500 can control at least one relay in the load circuit 350 so that at least one heating coil corresponding to the container's location is activated, depending on the container's location.

[0290] Furthermore, the controller 500 can determine or vary the switching frequency to control the switching drive of the inverter circuit of the drive circuit 300, depending on at least one of the material, shape, and size of the container.

[0291] Referring to Figure 25, the drive circuit according to one embodiment of the present invention may include a rectifier circuit 310 and inverter circuits 320a and 320b.

[0292] The inverter circuits 320a and 320b may include a first inverter circuit 320a and a second inverter circuit 320b. The first inverter circuit 320a can supply a first drive current to the load circuit 350 by switching drive, and the second inverter circuit 320b can supply a second drive current to the load circuit 350 by switching drive with the first inverter circuit 320a.

[0293] The load circuit 350 may include at least one capacitor (CS1, CS2, CS3, CS4, CS5, CS6, CS7, CS8) connected in series or in parallel, at least one heating coil (WC1, WC2, WC3, WC4, WC5, WC6, WC7, WC8), and at least one relay (RL1, RL2, RL3, RL4, RL5, RL6).

[0294] Furthermore, capacitors (CS1, CS2, CS3, CS4, CS5, CS6, CS7, CS8) can be used to filter the DC component in the drive current. Heating coils (WC1, WC2, WC3, WC4, WC5, WC6, WC7, WC8) can be used to heat the cooking container using electromagnetic induction.

[0295] Relays (RL1, RL2, RL3, RL4, RL5, RL6) can be used to selectively connect heating coils (WC1, WC2, WC3, WC4, WC5, WC6, WC7, WC8) in series or parallel. The heating coils (WC1, WC2, WC3, WC4, WC5, WC6, WC7, WC8) and capacitors (CS1, CS2, CS3, CS4, CS5, CS6, CS7, CS8) can be used to determine the resonant frequency of the drive current.

[0296] The load circuit 350 may include a first capacitor (CS1), a first heating coil (WC1), a second heating coil (WC2), a second capacitor (CS2), and a first relay (RL1). The first capacitor (CS1) transmits a first drive current supplied from the first inverter circuit 320a, the first heating coil (WC1) may be connected in series with the first capacitor (CS1), and the second heating coil (WC2) may be connected in series with the first heating coil (WC1). The second capacitor (CS2) may be connected in series with the second heating coil (WC2), and the first relay (RL1) can switch between the second capacitor (CS2) and the ground voltage terminal.

[0297] Furthermore, the load circuit 350 may further include a third capacitor (CS3), a third heating coil (WC3), a fourth heating coil (WC4), a fourth capacitor (CS4), and a second relay (RL2).

[0298] The third capacitor (CS3) transmits the second drive current supplied from the second inverter circuit 320b, the third heating coil (WC3) is connected in series with the third capacitor (CS3), and the fourth heating coil (WC4) may also be connected in series with the third heating coil (WC3). The fourth capacitor (CS4) is connected in series with the fourth heating coil (WC4), and the second relay (RL2) can switch between the fourth capacitor (CS4) and the ground voltage terminal.

[0299] The load circuit 350 may also further include a third relay (RL3). The third relay (RL3) can switch the nodes between the first heating coil (WC1) and the second heating coil (WC2), and the nodes between the third heating coil (WC3) and the fourth heating coil (WC4).

[0300] Furthermore, the load circuit 350 may further include a fifth capacitor (CS5), a fifth heating coil (WC5), a sixth heating coil (WC6), a sixth capacitor (CS6), and a fourth relay (RL4).

[0301] The fifth capacitor (CS5) transmits the first drive current supplied from the first inverter circuit 320a, the fifth heating coil (WC5) is connected in series with the fifth capacitor (CS5), and the sixth heating coil (WC6) may also be connected in series with the fifth heating coil (WC5). The sixth capacitor (CS6) is connected in series with the sixth heating coil (WC6), and the fourth relay (RL4) can switch between the sixth capacitor (CS6) and the ground voltage terminal.

[0302] Furthermore, the load circuit 350 may further include a seventh capacitor (CS7), a seventh heating coil (WC7), an eighth heating coil (WC8), an eighth capacitor (CS8), and a fifth relay (RL5).

[0303] The seventh capacitor (CS7) transmits the second drive current supplied from the second inverter circuit 320b, and the seventh heating coil (WC7) may be connected in series with the seventh capacitor (CS7). The eighth heating coil (WC8) is connected in series with the seventh heating coil (WC7), and the eighth capacitor (CS8) is connected in series with the eighth heating coil (WC8). The fifth relay (RL5) can switch between the eighth capacitor (CS8) and the ground voltage terminal.

[0304] The load circuit 350 may also further include a sixth relay (RL6). The sixth relay (RL6) can switch the nodes between the fifth heating coil (WC5) and the sixth heating coil (WC6), and between the seventh heating coil (WC7) and the eighth heating coil (WC8).

[0305] [Laminated structure of coil substrate laminates] Referring to Figures 7 and 8, each coil module 1001, 1003 may be formed by a coil substrate laminate 1010. The coil substrate laminate 1010 may include a plurality of first coil substrate sections 1100 stacked in the vertical direction, and at least one second coil substrate section 1200.

[0306] The first coil substrate portion 1100 may be formed in a configuration in which the core 1110 and the first coil portion 1120 are stacked vertically, as shown in Figures 8 and 19. The second coil substrate portion 1200 may be formed in a configuration in which the core 1210 and the second coil portion 1220 are stacked vertically. The core 1210 forms the framework of the second coil substrate portion 1200 and may be made of the same or similar material as the core 1110 of the first coil substrate portion 1100.

[0307] For example, in the first coil substrate portion 1100, the first coil portions 1120 may be arranged on both the upper and lower sides of the core 1110. For instance, the first coil portions 1120 may be stacked on the top and bottom surfaces of the core 1110, respectively.

[0308] Furthermore, in the second coil substrate section 1200, the first coil section 1120 may be arranged on one side of the core 1210 in the vertical direction, i.e., the lower side, and the second coil section 1220 may be arranged on the other side of the core 1210 in the vertical direction, i.e., the upper side. For example, the first coil section 1110 may be laminated on the bottom surface of the core 1210, and the second coil section 1220 may be laminated on the top surface of the core 1210.

[0309] As another example, in the second coil substrate portion 1200, the second coil portions 1220 may be arranged on both sides of the core 1210 in the vertical direction.

[0310] In this embodiment, the second coil substrate portion 1200 includes a first coil portion 1120 and a second coil portion 1220, with the first coil portion 1120 being located below the core 1210 and the second coil portion 1220 being located above the core 1210.

[0311] According to this embodiment, the heating coil (WC), more specifically the coil substrate laminate 1010, may include six or more first coil sections 1120. That is, the coil substrate laminate 1010 may include six or more first coil sections 1120 that are connected vertically and integrally bonded together.

[0312] In order to ensure sufficient induced power for heating the object to be heated by the heating coil (WC), the amount of conductor contained in the heating coil (WC) must be sufficient. There are limits to increasing the height of the coil pattern (Cp) in order to increase the amount of conductor contained in the heating coil (WC).

[0313] Considering these points, increasing the number of coil patterns (Cp) in each layer that make up the heating coil (WC), and increasing the number of layers of coil patterns (Cp) that make up the heating coil (WC), can be an effective way to increase the amount of conductor contained in the heating coil (WC).

[0314] According to this embodiment, three or more coil patterns (Cp) connected in parallel in each layer are arranged along the diametrical direction of the heating coil (WC) to form a single coil wire. Then, three or more of these coil wires are stacked so as to overlap in the vertical direction to form a heating coil (WC).

[0315] When considering the winding interval of the coil pattern (Cp) and other design conditions, there are limits to increasing the number of coil patterns (Cp) in each layer. For example, increasing the number of coil patterns (Cp) in each layer may increase the size of each heating coil (WC), which could lead to a problem where the number of heating coils (WC) placed in the cooking equipment must be reduced.

[0316] Furthermore, if the width of the coil pattern (Cp) is reduced in order to increase the number of coil patterns (Cp) in each layer, the amount of conductor contained in the heating coil (WC) may actually decrease despite the increase in the number of coil patterns (Cp), due to the increased space required to maintain the spacing between the coil patterns (Cp).

[0317] In contrast, increasing the number of layers in the coil pattern (Cp) can be said to be a way to relatively reduce the occurrence of problems. That is, as the number of layers in the coil pattern (Cp) increases, the amount of conductor contained in the heating coil (WC) can also increase accordingly, and even if the number of layers in the coil pattern (Cp) increases, there is less risk of problems occurring such as a decrease in the number of heating coils (WC) or a decrease in the amount of conductor contained in the heating coils (WC).

[0318] Considering these points, in this embodiment, as long as three or more coil patterns (Cp) are arranged in each layer, three layers of coil patterns (Cp) are also arranged in the vertical direction, and three layers of coil wire can be formed. Furthermore, considering that the arrangement of these three layers of coil wire (e.g., first coil wire) necessitates the arrangement of three layers of coil wire (e.g., second coil wire) with different patterns from the aforementioned coil wire, it is preferable that the coil substrate laminate 1010 contains six or more layers of coil wire.

[0319] Furthermore, depending on the design conditions, stacking the coil wires in eight or more layers can more effectively increase the amount of conductor contained in the heating coil (WC). In this embodiment, it is exemplified that eight to twelve layers of the first coil section 1120 are stacked in the vertical direction. However, the present invention is not limited thereto, and the first coil section 1120 may be stacked in more than twelve layers.

[0320] As an example, the coil modules 1001 and 1003 may be designed such that the thickness of each layer of the first coil section 1120 decreases as the number of layers of the first coil section 1120 increases. In this way, despite the increase in the number of layers of the first coil section 1120, the increase in the overall thickness of the coil modules 1001 and 1003 may be suppressed to an appropriate level.

[0321] Furthermore, the coil substrate laminate 1010 may include at least one second coil section 1220. For example, the coil substrate laminate 1010 may include eight to twelve first coil sections 1120 and one to two second coil sections 1220 that are connected vertically and integrally bonded.

[0322] Furthermore, the coil substrate laminate 1010 may further include an insulating layer that is laminated vertically together with the first coil portion 1120. In each coil substrate laminate 1010, the coil portions 1120, 1220 and the insulating layer may be arranged alternately in the vertical direction.

[0323] In the first coil substrate portion 1100, the insulating layer may be formed by the core 1110. Similarly, in the second coil substrate portion 1200, the insulating layer may also be formed by the core 1210.

[0324] Furthermore, the insulating layer may also be placed between the coil substrate portions 1100 and 1200. For example, an insulating layer may be placed between a pair of vertically adjacent first coil substrate portions 1100, and an insulating layer may also be placed between the first coil substrate portion 1100 and the second coil substrate portion 1200. Additionally, an insulating layer may also be placed between a pair of vertically adjacent second coil substrate portions 1200.

[0325] As an example, as described above, the insulating layer placed between the coil substrate portions 1100 and 1200 may be formed by adhesive 1400. In this embodiment, a plurality of first coil substrate portions 1100 stacked in the vertical direction may be joined by adhesive 1400, and the first coil substrate portion 1100 and the second coil substrate portion 1200 may also be joined by adhesive 1400. Furthermore, a plurality of second coil substrate portions 1200 stacked in the vertical direction may also be joined by adhesive 1400.

[0326] According to this, an insulating layer may be formed by the cores 1110 and 1210 provided in the first coil substrate section and the second coil substrate section 1100 and 1200 (hereinafter referred to as "coil substrate section"), respectively, or by the adhesive 1400 placed between the coil substrate sections 1100 and 1200.

[0327] The cores 1110 and 1210 can be positioned between a pair of vertically opposing first coil sections 1120 or second coil sections 1220, or between the first coil section 1120 and the second coil section 1220, to form an insulating layer between them. In other words, the cores 1110 and 1210 can form an insulating layer inside the first coil substrate section 1100 or inside the second coil substrate section 1200.

[0328] The adhesive 1400 can be placed between a pair of first coil sections 1120 facing each other in the vertical direction, or a pair of second coil sections 1220 facing each other in the vertical direction, or between a first coil section 1120 and a second coil section 1220 facing each other in the vertical direction, to form an insulating layer between them. In other words, the adhesive 1400 can form an insulating layer on the outside of the first coil substrate section 1100 or the second coil substrate section 1200.

[0329] As a result, either the first coil section 1120, 1220 (hereinafter referred to as "coil section") and the insulating layer may be arranged alternately in the vertical direction. That is, the first coil section 1120 and the insulating layer may be arranged alternately in the vertical direction, and the second coil section 1220 and the insulating layer may be arranged alternately.

[0330] Furthermore, in a plurality of insulating layers arranged in the vertical direction, the cores 1110, 1210 and the adhesive 1400 may be arranged alternately in the vertical direction. For example, the coil sections 1120, 1220 and the insulating layers may be stacked vertically in the order of "◎First coil section 1120 - Core 1110 - First coil section 1120 - Adhesive 1400 - First coil section 1120◎".

[0331] In this embodiment, the coil substrate portions 1100 and 1200 are exemplified as being formed from a copper foil laminate containing cores 1110 and 1210 and foil, respectively. In this case, the cores 1110 and 1210 may be formed from a thermo-cured prepreg.

[0332] For example, the cores 1110 and 1210 may be formed from a prepreg of FR4, and the coil portions 1120 and 1220 may be formed as a result of foil laminated on the cores 1110 and 1210 being patterned into a coil shape. The thickness of the first coil substrate portion 1100 or the second coil substrate portion 1200 may be adjusted by changing the thickness of the core 1110, or by changing the thickness of the first coil portion 1120 or the second coil portion 1220.

[0333] Furthermore, the adhesive 1400 may be formed from a prepreg material. For example, each adhesive 1400 may contain multiple prepreg films stacked in the vertical direction. The thickness of the adhesive 1400 may be adjusted by changing the number of prepreg films stacked in the vertical direction.

[0334] The thickness of the adhesive 1400 may be set to be thicker than the thickness of the cores 1110 and 1210. In this embodiment, both the cores 1110 and 1210 and the adhesive 1400 are formed from prepreg, but the cores 1110 and 1210 are formed from heat-cured prepreg, while the adhesive 1400 is formed from unheat-cured prepreg. Taking this into consideration, in this embodiment, the adhesive 1400 is formed to be thicker than the cores 1110 and 1210, so that the strength of the adhesive 1400 is maintained at a level similar to that of the cores 1110 and 1210, thereby strengthening the coil modules 1001 and 1003.

[0335] Furthermore, the thickness of the adhesive 1400 may be set to be thicker than the thickness of the coil sections 1120 and 1220. For example, the thickness of the adhesive 1400 may be set to more than twice the thickness of the coil sections 1120 and 1220. The adhesive 1400 formed in this manner can contribute to strengthening the coil sections 1120 and 1220 which are arranged on both sides of the adhesive 1400 in the vertical direction.

[0336] On the other hand, the heating coil assembly 1000 of this embodiment may further include outer layers 1300 and 1350. The outer layers 1300 and 1350 may be arranged on the outside of the coil substrate laminate 1010 in the vertical direction. For example, the outer layers 1300 and 1350 may be arranged on the upper and lower sides of the coil substrate laminate 1010, respectively, and a pair of such outer layers 1300 and 1350 may be stacked vertically together with the coil substrate laminate 1010. In this way, a pair of outer layers 1300 and 1350 stacked vertically together with the coil substrate laminate 1010 can form the upper and lower ends of the coil modules 1001 and 1003.

[0337] The outer layers 1300 and 1350 may be divided into a first outer layer 1300 and a second outer layer 1350. The first outer layer 1300 may include a plurality of first coils 1120 arranged laterally, similar to the first coil. The second outer layer 1350 may include a plurality of second coils 1220 arranged laterally, similar to the second coil.

[0338] The first outer layer 1300 can form a heating coil (WC) together with a plurality of first coil sections 1120 stacked in the vertical direction. Similarly, the second outer layer 1350 can form a heating coil (WC) together with the second coil section 1220. That is, the first outer layer 1300 may be connected to the first coil section 1120 in the vertical direction, and the second outer layer 1350 may be connected to the second coil section 1220 in the vertical direction.

[0339] The first outer layer 1300 may be positioned adjacent to the first coil substrate 1100. For example, the first outer layer 1300 may be positioned below the first coil substrate 1100 and connected vertically to the first coil 1120. These first outer layers 1300 can form a heating coil (WC) together with the first coil 1120.

[0340] The second outer layer 1350 may be positioned adjacent to the second coil substrate 1200. For example, the second outer layer 1350 may be positioned above the second coil substrate 1200 and connected vertically to the second coil 1220. These second outer layers 1350 can form a sensing coil (SC) together with the second coil 1220.

[0341] For example, a coil substrate laminate 1010 may be formed in which a second coil portion 1220 is stacked on top of a plurality of first coil portions 1120. These coil substrate laminates 1010 may be arranged between a first outer layer portion 1300 and a second outer layer portion 1350 that are spaced apart in the vertical direction.

[0342] In this case, the first outer layer 1300, positioned below the first coil substrate 1100, forms the lower end of the coil modules 1001 and 1003, and together with the first coil portion 1120, can form a heating coil (WC). Furthermore, the second outer layer 1350, positioned above the second coil substrate 1200, forms the upper end of the coil modules 1001 and 1003, and together with the second coil portion 1220, can form a sensing coil (SC).

[0343] In this embodiment, each coil substrate portion 1100, 1200 has a pair of coil portions 1120, 1220 arranged vertically. That is, two layers of coil portions 1120, 1220 are formed for each coil substrate portion 1100, 1200. The coil substrate laminate 1010, formed by stacking multiple coil substrate portions 1100, 1200, may include multiple layers of coil portions 1120, 1220, or it may include an even number of layers of coil portions 1120, 1220.

[0344] Furthermore, outer layers 1300 and 1350 are attached to both the upper and lower sides of the coil substrate laminate 1010 formed as described above. As a result, each coil module 1001 and 1003 has multiple layers of coil sections 1120 and 1220, although an even number of coil sections 1120 and 1220 may be arranged.

[0345] The outer layers 1300 and 1350 may be bonded to the coil substrate laminate 1010 by an adhesive 1400 placed between the coil portions 1120 and 1220 and the outer layers 1300 and 1350. The adhesive 1400 forms an insulating layer between the coil portions 1120 and 1220 and the outer layers 1300 and 1350, thereby bonding the coil substrate laminate 1010 to the outer layers 1300 and 1350.

[0346] As an example, the adhesive 1400 placed between the first outer layer 1300 and the first coil substrate 1100, which are located at the bottom of the coil modules 1001 and 1003, can form an insulating layer between the first coil portion 1120 provided on the first coil substrate 1100 and the first coil portion 1120 provided on the first outer layer 1300, thereby joining the first coil substrate 1100 and the first outer layer 1300.

[0347] Furthermore, the adhesive 1400, which is placed between the second outer layer portion 1350 and the second coil substrate portion 1200 located at the upper ends of the coil modules 1001 and 1003, forms an insulating layer between the second coil portion 1220 provided on the second coil substrate portion 1200 and the second coil portion 1220 provided on the second outer layer portion 1350, thereby bonding the first coil substrate portion 1100 to the outer layers 1300 and 1350.

[0348] In this embodiment, a configuration is shown in which a coil substrate laminate 1010, a heating coil (WC), and a sensing coil (SC) are formed by stacking units such as coil substrate sections 1100, 1200 and coil sections 1120, 1220. However, the present invention is not limited thereto.

[0349] As another example, the heating coil (WC) and coil modules 1001, 1003 may be formed by sequentially stacking the conductors of each layer from the bottom layer without a separate substrate. In this case, the coil modules 1001, 1003 may be formed in which the conductors for forming the heating coil (WC) and the adhesive 1400 are alternately stacked in the vertical direction.

[0350] Furthermore, although the above description states that the coil modules 1001 and 1003 are formed by stacking the various parts that constitute them, such as the coil substrate parts 1100 and 1200, the coil parts 1120 and 1220, and the conductor, the coil modules 1001 and 1003 are actually formed in a form where the various parts that constitute them are integrated.

[0351] In other words, the coil modules 1001 and 1003 of this embodiment are formed as a single unit and are not separated into individual parts unless cut or chemically treated.

[0352] [Shape of the heating coil] Figure 27 is a plan view showing an example of a heating coil, and Figure 28 is a plan view showing another example of a heating coil.

[0353] Referring to Figures 17 and 27, the heating coil (WC) may be formed in a shape that includes polygons. For example, the lateral outer shape of the heating coil (WC) may be polygonal. In other words, the shape of the heating coil (WC) when viewed from above may be polygonal.

[0354] For example, the outer shape of the heating coil (WC) may be approximately rectangular. The outer shape of the coil modules 1001 and 1003, which include the heating coil (WC), may also be polygonal. Furthermore, the heating coil (WC) may be formed by a patterned coil patterned into an insulating layer. For instance, the heating coil (WC) may be formed by a patterned coil patterned into an insulating layer, rather than a Litz coil wound in a nearly circular shape.

[0355] Thus, by forming the heating coil (WC) in a patterned shape, the outer shape of the heating coil (WC) can be easily formed into a polygonal shape, or more specifically, a roughly rectangular shape.

[0356] Furthermore, because the outer shape of the heating coil (WC) is formed in these forms, the heating coil (WC) can occupy an area very close to the edges of the coil modules 1001 and 1003, thereby effectively increasing the density of the area occupied by the heating coil (WC) within the coil modules 1001 and 1003.

[0357] Furthermore, the lateral outer shape of each first coil substrate portion 1100 provided in each heating coil (WC) (hereinafter referred to as "outer shape of the first coil substrate portion") may be polygonal. For example, the outer shape of the first coil substrate portion 1100 may be substantially rectangular.

[0358] Furthermore, the lateral outer shape of the core 1110 that forms the skeleton of each first coil substrate portion 1100 (hereinafter referred to as the "core outer shape") may be polygonal, similar to the shapes of the coil modules 1001, 1003 and the first coil substrate portion 1100.

[0359] For example, the heating coil (WC) may be formed in a square spiral shape. For instance, the heating coil (WC) may be formed in a square spiral shape in which a first straight line (L1), which is a straight line in a first direction, and a second straight line (L2), which is a straight line in a second direction, are alternately connected to each other. Furthermore, the outer shape of the core 1110 of the first coil substrate portion 1100 that forms these heating coils (WC) may be formed in a square shape similar to the outer shape of the heating coil (WC).

[0360] As a result, at least one of the multiple outer edges of the heating coil (WC) may include a straight line parallel to the nearest adjacent of the multiple outer edges of the core 1110. For example, the first straight line (L1) located at the front of the heating coil (WC) may be formed as a straight line parallel to the front outer edge of the core 1110, and the second straight line (L2) located at the rightmost side of the heating coil (WC) may be formed as a straight line parallel to the right outer edge of the core 1110.

[0361] By forming the outer shape of the core 1110 and the outer shape of the heating coil (WC) in the manner described above, the heating coil (WC) can occupy an area very close to the edges of the coil modules 1001 and 1003, effectively increasing the density of the area occupied by the heating coil (WC) within the coil modules 1001 and 1003.

[0362] Furthermore, according to this embodiment, each coil module 1001, 1003 may include multiple heating coils (WC). That is, each coil module 1001, 1003 may include an assembly of multiple heating coils (WC) arranged in the horizontal direction. For example, each coil module 1001, 1003 may be provided with an assembly of heating coils (WC) including eight heating coils (WC) arranged in a 2x4 configuration along the horizontal direction.

[0363] According to this embodiment, the outer shape of the assembly of heating coils (WC) may be polygonal. That is, the outer shape of each coil module 1001, 1003, and the outer shape of the assembly of heating coils (WC) provided in the coil modules 1001, 1003, may both be polygonal.

[0364] For example, the outer shape of the assembly of heating coils (WC) may be arranged in a square shape. That is, the multiple heating coils (WC) provided in each coil module 1001, 1003 may be arranged in a square shape.

[0365] As another example, the outer shape of the heating coil (WCa) may be hexagonal, as shown in Figure 28. For example, the heating coil (WCa) may be formed in a hexagonal spiral shape. In this case, multiple heating coils (WCa) may be arranged in a honeycomb pattern in the coil module 1001a.

[0366] By arranging multiple heating coils (WCa), each formed in a hexagonal spiral shape, in a honeycomb pattern, the centers of all heating coils (WCa) provided in the coil module 1001a can maintain the same spacing. For example, all heating coils (WCa) provided in the coil module 1001a may be arranged such that the center distance between them and adjacent heating coils (WCa) is maintained at any specified value.

[0367] The heating coils (WCa) provided in these forms offer the advantage of simplifying the structural design of the heating coil assembly 1000, as the heating coils (WCa) perform both the function of sensing the presence of the object to be heated and the function of heating the object, by ensuring that the center distance between adjacent heating coils (WCa) is the same.

[0368] As yet another example, the outer shape of the heating coil may be circular or elliptical. For example, the heating coil may be formed in a spiral shape that is similar to a circular or elliptical shape. In this case as well, the coil module may be arranged so that the centers of all heating coils provided in the coil module can maintain the same spacing.

[0369] [Structure of the first longitudinal connection section] Figure 29 is an enlarged view showing the first coil section, Figure 30 is a diagram showing an example of a coil pattern laminate and a first longitudinal connection section, and Figure 31 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section shown in Figure 30. Furthermore, Figure 32 is a diagram showing another example of a coil pattern laminate and a first longitudinal connection section, Figure 33 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section shown in Figure 32, and Figure 34 is a diagram showing another example of the first longitudinal connection section. Furthermore, Figure 35 is a diagram showing an example of the connection structure of the coil pattern laminate and the first longitudinal connection section shown in Figure 34, and Figure 36 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section shown in Figure 35. Furthermore, Figure 37 is a diagram showing another example of the connection structure of the coil pattern laminate and the first longitudinal connection section shown in Figure 34, and Figure 38 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection section shown in Figure 37. Figure 39 is a diagram showing yet another example of the connection structure between the coil pattern laminate and the first longitudinal connection, and Figure 40 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection shown in Figure 39. Figure 41 is a diagram showing yet another example of the connection structure between the coil pattern laminate and the first longitudinal connection, and Figure 42 is a cross-sectional view showing the structure of the coil pattern laminate and the first longitudinal connection shown in Figure 41.

[0370] Referring to Figures 6, 17, and 29, the heating coil assembly 1000 of this embodiment may further include a first vertical connecting portion 1030. The first vertical connecting portion 1030 is provided in each coil substrate laminate 1010 so as to connect a plurality of first coil portions 1120 stacked in the vertical direction in the vertical direction.

[0371] Each first vertical connecting portion 1030 penetrates a plurality of first coil substrate portions 1100 in the vertical direction, and can connect a plurality of first coil portions 1120 arranged in the same straight line in the vertical direction in the vertical direction. Each heating coil (WC) may be formed as a result of a plurality of first coil portions 1120 arranged in the same straight line in the vertical direction being connected in the vertical direction by the first vertical connecting portion 1030.

[0372] Each first vertical connection section 1030 may include vias (V). Each via (V) can connect one via (V) vertically to each first coil section 1120, which are stacked vertically.

[0373] For example, each via (V) can be connected to one coil pattern (Cp) in each first coil substrate section 1100, and multiple coil patterns (Cp) stacked in the vertical direction can be connected vertically. In addition, each via (V) in each first coil section 1120 may be connected to a coil pattern (Cp) in the horizontal direction.

[0374] For example, the first coil portion 1120 may be formed in a square spiral shape. For instance, the first coil portion 1120 may be formed in a square spiral shape in which a first straight line (L1) in the first direction and a second straight line (L2) in the second direction are alternately connected to each other.

[0375] In this embodiment, the region of each first coil section 1120 in which the coil pattern (Cp) is arranged may be divided into a plurality of partitioned regions 1120a. In this case, the plurality of partitioned regions 1120a may be arranged along the diametrical direction of the helix formed by the first coil section 1120 (hereinafter referred to as the "diametrical direction").

[0376] For example, when viewing the vertical cross-section of each first coil section 1120, multiple partitioned regions 1120a may be arranged along the horizontal direction. As an example, if the first coil section 1120 contains six coil patterns (Cp), each partitioned region 1120a may contain six coil patterns (Cp) arranged along the diametrical direction.

[0377] Figure 29 illustrates a configuration in which the first coil section 1120 includes six coil patterns (Cp), but the present invention is not limited thereto. As another example, the first coil section 1120 may include four coil patterns (Cp), thereby including four coil patterns (Cp) arranged along the diametrical direction in each sectioned region 1120a (see Figure 34). As yet another example, the first coil section 1120 may include three coil patterns (Cp), thereby including three coil patterns (Cp) arranged along the diametrical direction in each sectioned region 1120a.

[0378] As described above, the first coil section 1120, which includes a plurality of partitioned regions 1120a, may further include a separation region 1120b where the coil pattern (Cp) is not arranged. According to this embodiment, the plurality of partitioned regions 1120a provided in the first coil section 1120 are arranged at predetermined intervals along the diametrical direction. The separation region 1120b may be arranged in the gaps between the plurality of partitioned regions 1120a. That is, in each first coil section 1120, the partitioned regions 1120a and the separation region 1120b may be arranged alternately in the diametrical direction.

[0379] For example, when viewing the vertical cross-section of each first coil section 1120, multiple partitioned regions 1120a and separated regions 1120b are arranged along the horizontal direction, but the partitioned regions 1120a and separated regions 1120b may be arranged alternately in the horizontal direction.

[0380] The first vertical connecting portion 1030 may be located in the separation region 1120b. That is, the first vertical connecting portion 1030 may be located in the gap between a plurality of partition regions 1120a, and may include at least one via (V) located in the separation region 1120b.

[0381] According to this embodiment, a single coil wire 1123,1124 is formed by a collection of multiple coil patterns (Cp) arranged along the diametrical direction, and this single coil wire 1123,1124 can be wound multiple times to form a single first coil section 1120. That is, each coil wire 1123,1124 may have multiple coil patterns (Cp) arranged along the diametrical direction, and each coil pattern (Cp) may extend along the circumferential direction (hereinafter referred to as "circumferential direction") of the helix formed by the first coil section 1120.

[0382] Thus, the multiple coil patterns (Cp) forming the coil wires 1123 and 1124 can form a twisted structure within the heating coil (WC). For example, each coil pattern (Cp) may extend along the circumferential direction, as shown in Figure 30, but may also extend in a direction between the circumferential and diametrical directions. That is, each coil pattern (Cp) forming the coil wires 1123 and 1124 may form a diagonal line inclined in the diametrical direction and extend along the circumferential direction.

[0383] For example, at any position along the circumferential direction of coil wires 1123 and 1124, one of the coil patterns (Cp) located on the outermost diametrically in the coil wires 1123 and 1124 may be located at the center diametrically in the coil wires 1123 and 1124 at other positions along the circumferential direction, and at yet another position along the circumferential direction, it may be located on the innermost diametrically in the coil wires 1123 and 1124.

[0384] In other words, each coil wire 1123, 1124 forming the first coil section 1120 can form a lateral twist structure within the first coil section 1120 by changing the diametrical position between the coil patterns (Cp) within the coil wires 1123, 1124.

[0385] In this embodiment, the coil wires 1123 and 1124 are exemplified as being divided into a first coil wire 1123 and a second coil wire 1124. In the first coil wire 1123, each coil pattern (Cp) may form a diagonal line inclined in the centripetal direction and extend along the circumferential direction. In the second coil wire 1124, each coil pattern (Cp) may form a diagonal line inclined in the centrifugal direction and extend along the circumferential direction.

[0386] According to this embodiment, a heating coil (WC) can be formed by connecting a first coil wire 1123 and a second coil wire 1124 stacked in the vertical direction, and the first vertical connecting portion 1030 can connect the first coil wire 1123 and the second coil wire 1124 stacked in the vertical direction in the vertical direction.

[0387] Each first vertical connecting portion 1030 is connected to one coil pattern (Cp) for each coil wire 1123, 1124, and multiple coil patterns (Cp) stacked in the vertical direction can be connected vertically. In addition, each coil pattern (Cp) may be connected to multiple first vertical connecting portions 1030 arranged along the circumferential direction. That is, each coil pattern (Cp) may be connected vertically to other coil patterns (Cp) located above or below it at multiple points along the circumferential direction.

[0388] As a result, the coil patterns (Cp) of the first coil wire 1123 and the second coil wire 1124 are connected alternately to each other. In other words, the first coil wire 1123 and the second coil wire 1124, stacked in the vertical direction, can form a vertically twisted structure within the heating coil (WC) in a manner in which the first coil wire 1123 and the second coil wire 1124 are connected alternately to each other.

[0389] According to this, each coil wire 1123, 1124 forming the first coil section 1120 forms a lateral twist structure within the first coil section 1120, and the first coil wire 1123 and second coil wire 1124 stacked in the vertical direction form a vertical twist structure, thereby enabling the multiple coil patterns (Cp) forming the heating coil (WC) to form a twisted structure.

[0390] The twisted structure of the heating coil (WC) formed in this manner not only increases the length of the connected body formed as a result of linking multiple coil patterns (Cp) to form the heating coil (WC), but also has the advantage of preventing the position of each coil pattern (Cp) from being biased only towards the innermost or outermost part within each heating coil (WC).

[0391] On the other hand, referring to Figures 29 to 31, each via (V) may include a hole (Va), an inner wall (Vb), and a land (Vc). The hole (Va) may be formed in the shape of a hole that penetrates at least a portion of the coil substrate laminate 1010 in the vertical direction. These holes (Va) can penetrate in the vertical direction of the region of the coil substrate laminate 1010 in which the first coil substrate portion 1100 is laminated.

[0392] The inner wall portion (Vb) is positioned inside the hole portion (Va) and can connect multiple coil patterns (Cp) stacked in the vertical direction. These inner wall portions (Vb) include conductors positioned in the hole portion (Va) and can electrically connect multiple coil patterns (Cp) stacked in the vertical direction. As an example, the inner wall portion (Vb) may be formed in the form of copper foil plated on the inner wall of the first coil substrate portion 1100 surrounding the hole portion (Va).

[0393] The land portion (Vc) can electrically connect the inner wall portion (Vb) and the coil pattern (Cp). These land portions (Vc) may be formed in the form of copper foil plated on the upper or bottom surface of the first coil substrate portion 1100 and electrically connected to the inner wall portion (Vb) and the coil pattern (Cp), respectively.

[0394] Each of the first vertical connection portions 1030 configured as described above may further include via connection portions (Vd). The via connection portions (Vd) are provided to electrically connect the coil pattern (Cp) and the via (V), more specifically, the coil pattern (Cp) and the land portion (Vc). These via connection portions (Vd) may be formed in the form of a pattern that protrudes laterally from the coil pattern (Cp) toward the separation region 1120b.

[0395] For example, the via connection portion (Vd) may extend from the coil pattern (Cp) but be formed to extend in a direction between the diametrical and circumferential directions of the helix formed by the first coil portion 1120. For instance, the via connection portion (Vd) may be formed in the form of a straight line connecting the coil pattern (Cp) and the via (V) in a direction between the diametrical and circumferential directions.

[0396] Each via (V) provided in the manner described above is connected to one coil pattern (Cp) per coil wire 1123, 1124, and multiple coil patterns (Cp) can be connected in the vertical direction. The first vertical connection section 1030, including these vias (V), can electrically connect multiple coil patterns (Cp) stacked in the vertical direction.

[0397] As an example, a heating coil (WC) is formed as a result of multiple coil wires 1123, 1124 stacked in the vertical direction and connected in the vertical direction. It is exemplified that the WC is formed by connecting an assembly of multiple first coil wires 1123 that are continuously connected along the vertical direction with an assembly of multiple second coil wires 1124 that are continuously connected along the vertical direction.

[0398] For example, a heating coil (WC) may be formed by continuously connecting 4 to 5 first coil wires 1123 in the vertical direction, and then continuously connecting 4 to 5 second coil wires 1124 in the vertical direction to the lower side of the assembly.

[0399] These forms of heating coils (WC) offer an advantage in cases where interlayer coil wires 1123 and 1124 unintentionally join due to various unknown reasons related to the characteristics of the micro-processing. The arrangement of coil wires 1123 and 1124 in the above-described form may be an arrangement that improves the reliability of coil formation, as it places coil wires 1123 and 1124 oriented in the same current direction adjacent to each other.

[0400] As another example, as shown in Figures 32 and 33, the first coil wire 1123 and the second coil wire 1124 may be arranged alternately along the vertical direction. That is, with the first coil wire 1123 and the second coil wire 1124 arranged alternately along the vertical direction, vertical connections may be made between the first coil wire 1123 and the second coil wire 1124, and the heating coil (WC) may be formed as a result of multiple first coil wires 1123 and second coil wires 1124 being connected vertically in this manner.

[0401] In the configuration where coil wires 1123 and 1124 are connected in a continuous manner, current concentrates at the midpoint of the via (V) in the vertical direction, that is, at the point where the first coil wire 1123 and the second coil wire 1124 meet. This increases heat generation at that point, which can make it difficult for current to flow smoothly through the via (V) (see Figures 31 and 32).

[0402] In contrast, when the coil wires 1123 and 1124 are arranged alternately, each of the first coil wires 1123 may be paired with each of the second coil wires 1124 and arranged adjacent to each other. In this case, when the coil wires 1123 and 1124 are arranged alternately, the current flows separately, and the amount of heat generated can be relatively reduced. That is, not only does the current flow through the via (V) become smoother, but the phenomenon of heat generation concentrating in a part of the via (V) can be effectively suppressed.

[0403] As described above, each first vertical connecting portion 1030 that connects the first coil wire 1123 and the second coil wire 1124 in the vertical direction may include at least one via (V). For example, each first vertical connecting portion 1030 may include one via (V).

[0404] According to this embodiment, vias (V) may be placed in the separation region 1120b. For example, vias (V) may be placed further inward than the innermost coil pattern (Cp) in the diametrical direction among the plurality of coil patterns (Cp) forming each coil wire 1123, 1124, or further outward than the outermost coil pattern (Cp).

[0405] For example, the distance between the innermost of the multiple coil patterns (Cp) and the center of the via (V), or the distance between the outermost of the multiple coil patterns (Cp) and the center of the via (V), may be set to be longer than the radius of the via (V).

[0406] This allows vias (V) placed in the separation region 1120b to be positioned so as not to come into contact with diametrically adjacent coil patterns (Cp), that is, other coil patterns (Cp) that are not directly connected to this via (V).

[0407] Furthermore, the vertical distance between the center of via (V) and the first straight line (L1), or the vertical distance between the center of via (V) and the second straight line (L2), may be set to be longer than the radius of via (V). Also, the lateral length of the separation region 1120b may be formed to be longer than the diameter of via (V). In such cases, via (V) can be positioned in the separation region 1120b so that it does not come into contact with the coil pattern (Cp).

[0408] As another example, each first longitudinal connection portion 1030 may include a plurality of vias (V), as shown in Figures 34 to 36. For example, each first longitudinal connection portion 1030 may include a plurality of vias (V) arranged along the circumferential direction (hereinafter referred to as the "circumferential direction") of the helix formed by the first coil portion 1120.

[0409] Each via (V) included in the first vertical connection section 1030 can form a passage connecting a plurality of coil patterns (Cp) stacked in the vertical direction. The width of the passage formed by each via (V) is mainly related to the area of ​​the inner wall (Vb). That is, as the area of ​​the inner wall (Vb) increases, the width of the passage formed by the via (V) can increase.

[0410] The area of ​​the inner wall portion (Vb) is mainly related to the diameter of the hole portion (Va). That is, as the diameter of the hole portion (Va) increases, the area of ​​the inner wall portion (Vb) increases, which can widen the passage formed by the via (V). If the first longitudinal connection portion 1030 contains one via (V), the diameter of the hole portion (Va) must increase in order for the area of ​​the inner wall portion (Vb) to increase.

[0411] However, since the via (V) must be placed in the separation region 1120b, that is, in the region without the coil pattern (Cp), the size of the separation region 1120b must increase in order for the diameter of the hole (Va) to increase. For this reason, not only the length of the separation region 1120b along the circumferential direction but also the length of the separation region 1120b along the diametrical direction must increase. However, if the length of the separation region 1120b along the diametrical direction increases, the width of the area in the first coil section 1120 where the coil pattern (Cp) can be placed will inevitably decrease.

[0412] Taking these points into consideration, in this embodiment, each first vertical connection portion 1030 may be formed by a plurality of vias (V) arranged along the circumferential direction. In this case, each first vertical connection portion 1030 can form a plurality of passages that connect a plurality of coil patterns (Cp) stacked in the vertical direction.

[0413] In other words, each of the multiple coil patterns (Cp) stacked in the vertical direction may be connected vertically by multiple passages formed by multiple vias (V) that form a single first vertical connection portion 1030.

[0414] In each first vertical connection section 1030, the multiple vias (V) arranged in the horizontal direction may be electrically connected to one another. That is, in each first vertical connection section 1030, the electrical connection between the multiple vias (V) may be achieved by a coil pattern (Cp) electrically connected to the multiple vias (V), and by the connection of the land portions (Vc) provided on each via (V) to one another.

[0415] As described above, by providing the first vertical connection portion 1030 with multiple vias, the area of ​​the inner wall portion (Vb) of the first vertical connection portion 1030 can be increased, thereby reducing the resistance in the first vertical connection portion 1030 and reducing the amount of heat generated in the first vertical connection portion 1030.

[0416] As described above, the multiple vias (V) constituting the first vertical connection portion 1030 may be arranged in the separation region 1120b and connected to a via connection portion (Vd) that protrudes from the coil pattern (Cp) into the separation region 1120b. In this case, the via connection portion (Vd) may form a straight line extending from the coil pattern (Cp) in a direction between the diametrical direction and the circumferential direction, and the multiple vias (V) connected to it may be arranged along the circumferential direction.

[0417] When the first coil portion 1120 is formed in a square spiral shape, the first vertical connecting portion 1030 may be connected to a first straight line (L1) and to a second straight line (L2). When the first vertical connecting portion 1030 is connected to a first straight line (L1), the first vertical connecting portion 1030 may include a plurality of vias (V) arranged along a first direction. When the first vertical connecting portion 1030 is connected to a second straight line (L2), the first vertical connecting portion 1030 may include a plurality of vias (V) arranged along a second direction.

[0418] The first longitudinal connecting portion 1030 and the multiple vias (V) contained therein are arranged in the separation region 1120b. As a result, the first longitudinal connecting portion 1030 connected to the first straight line (L1) and the first straight line (L1) may be arranged in the second direction, and the first longitudinal connecting portion 1030 connected to the second straight line (L2) and the second straight line (L2) may be arranged in the first direction. That is, the first longitudinal connecting portion 1030 connected to the first straight line (L1) and the first straight line (L1) may be arranged in the diametrical direction, and the first longitudinal connecting portion 1030 connected to the second straight line (L2) and the second straight line (L2) may also be arranged in the diametrical direction.

[0419] In each first vertical connection section 1030, multiple vias (V) form multiple passages, so the width of the passages formed by each first vertical connection section 1030 can increase compared to the case where the vertical connection section contains only one via (V). For example, the width of the passages formed by the first vertical connection section 1030 can increase in proportion to the number of vias (V).

[0420] According to this embodiment, the multiple vias (V) forming each first vertical connection portion 1030 may be arranged along the circumferential direction. That is, in each first vertical connection portion 1030, the multiple vias (V) may not be arranged in a direction parallel to the straight line formed by the via connection portion (Vd), but rather along the circumferential direction.

[0421] If, in the first longitudinal connection portion 1030, a plurality of vias (V) are arranged in a direction parallel to the straight line formed by the via connection portion (Vd), for example, in a direction between the diametrical direction and the circumferential direction, then the size of the separation region 1120b where the first longitudinal connection portion 1030 is located must increase, or the number of vias (V) must decrease, or the size of the vias (V) must decrease.

[0422] In contrast, in this embodiment, multiple vias (V) are arranged along the circumferential direction in the first longitudinal connection portion 1030. As a result, even if each first longitudinal connection portion 1030 contains multiple vias (V), the size of the separation region 1120b in which the first longitudinal connection portion 1030 is located does not need to increase, and in particular, the length of the separation region 1120b along the diametrical direction does not need to increase.

[0423] As a result, the first vertical connecting portion 1030 in this embodiment can effectively increase the width of the passage formed by the first vertical connecting portion 1030 in order to connect multiple coil patterns (Cp) in the vertical direction, while suppressing a decrease in the width of the area in which coil patterns (Cp) can be arranged in the first coil portion 1120.

[0424] In this embodiment, a plurality of vias (V) constituting the first vertical connecting portion 1030 are shown to be arranged in a direction parallel to the circumferential direction, but the present invention is not limited thereto.

[0425] As another example, vias (V) may be arranged in the diametrical direction or in a direction between the diametrical and circumferential directions, within the range where the vias (V) do not leave the separation region 1120b, and the vias (V) may be arranged in a manner that forms a curved line or curve rather than a straight line, or in the form of a polygon, circle or ellipse.

[0426] For example, the distance between the innermost of the multiple coil patterns (Cp) and the center of the via (V), or the distance between the innermost of the multiple coil patterns (Cp) and the center of the via (V), may be set to be longer than the radius of the via (V).

[0427] This allows vias (V) placed in the separation region 1120b to be positioned so as not to come into contact with diametrically adjacent coil patterns (Cp), that is, other coil patterns (Cp) that are not directly connected to this via (V).

[0428] Furthermore, the vertical distance between the center of via (V) and the first line (L1), or the vertical distance between the center of via (V) and the second line (L2), may be set to be longer than the radius of via (V). Also, the lateral length of the separation region 1120b may be formed to be longer than the diameter of via (V). In such cases, via (V) can be positioned in the separation region 1120b so that it does not come into contact with the coil pattern (Cp).

[0429] As another example, as shown in Figures 37 to 38, the first vertical connection section 1030 may be provided with a plurality of vias (V), and the first coil wire 1123 and the second coil wire 1124 may be arranged alternately along the vertical direction.

[0430] As yet another example, as shown in Figures 39 to 40, the first vertical connection portion 1030 may include more than two vias (V), for example, five vias (V), and these multiple vias (V) may be arranged along the circumferential direction.

[0431] As yet another example, as shown in Figures 41 to 42, the first vertical connection portion 1030 may have more than two vias (V), and the first coil wire 1123 and the second coil wire 1124 may be arranged alternately along the vertical direction.

[0432] As yet another example, two or more coil patterns (Cp) may be arranged in the diametrical direction. The lateral length of the separation region 1120b may be formed to be longer than twice the diameter of the via (V). For example, when two coil patterns (Cp) are arranged in the diametrical direction, the lateral length of the separation region 1120b is formed to be longer than twice the diameter of the via (V), and when three or more coil patterns (Cp) are arranged in the diametrical direction, the lateral length of the separation region 1120b may be formed to be longer than three times the diameter of the via (V).

[0433] This allows vias (V) to be positioned in the separation region 1120b in such a way that even when multiple vias (V) are arranged in the diametrical direction within the separation region 1120b, no contact occurs between the vias (V) and the coil pattern (Cp).

[0434] [Sensing coil structure] Figure 43 is a cross-sectional view showing an example of the laminated structure of the second outer layer and the second coil substrate; Figure 44 is an enlarged view showing a part of the second outer layer; and Figure 45 is an enlarged view showing a part of the second coil substrate.

[0435] In this embodiment, as shown in Figures 7 and 43-437, a sensing coil (SC) may be formed by second coil portions 1220 provided on the second coil substrate portion 1200. Each sensing coil (SC) may be formed by one second coil portion 1220, and may be formed as a result of multiple second coil portions 1220 stacked in the vertical direction and connected in the vertical direction.

[0436] For example, the sensing coil (SC) may be positioned above the heating coil (WC). Each second coil substrate portion 1200 may include a core 1210 and a second coil portion 1220. Furthermore, each second coil substrate portion 1200 may further include a first coil portion 1120.

[0437] The second coil section 1220 may be positioned on at least one of the two sides of the core 1210 in the vertical direction. For example, if the second coil substrate section 1200 includes both the first coil section 1120 and the second coil section 1220, the first coil section 1120 may be positioned on one side of the core 1210 in the vertical direction, and the second coil section 1220 may be positioned on the other side of the core 1210 in the vertical direction. For example, the first coil section 1120 may be provided in a patterned form on the lower side of the core 1210, and the second coil section 1220 may be provided in a patterned form on the upper side of the core 1210.

[0438] If the second coil substrate portion 1200 includes only the core 1210 and the second coil portion 1220, the second coil portion 1220 may be arranged on both the vertical sides of the core 1210. For example, each second coil substrate portion 1200 may be provided in a form in which the second coil portion 1220 is formed in layers on both the vertical sides of the core 1210. These second coil portions 1220 may be provided in a form that is patterned on both the vertical sides of the core 1210, similar to the first coil portion 1120.

[0439] In this embodiment, each second coil substrate portion 1200 includes a core 1210, a first coil portion 1120, and a second coil portion 1220, wherein the first coil portion 1120 is provided in a patterned form on the underside of the core 1210, and the second coil portion 1220 is provided in a patterned form on the upper side of the core 1210.

[0440] Furthermore, a second outer layer 1350 is positioned above the second coil substrate 1200, and this second outer layer 1350 may also include a second coil 1220, similar to the second coil substrate 1200. One second coil 1220 provided on the second coil substrate 1200 and one second coil 1220 provided on the second outer layer 1350 can be connected vertically to form a single sensing coil (SC).

[0441] Furthermore, multiple second coil sections 1220 may be arranged laterally in the second coil substrate section 1200 and the second outer layer section 1350, respectively, so that the coil modules 1001 and 1003 may include multiple sensing coils (SC) arranged laterally.

[0442] In each coil module 1001, 1003, the sensing coil (SC) may be positioned on the vertically outer side of the first coil substrate 1100. For example, the sensing coil (SC) may be positioned above or below the first coil substrate 1100.

[0443] As another example, the sensing coil (SC) may be located below the heating coil (WC). In this case, the second coil substrate portion 1200 may be located below the first coil substrate portion 1100, and the second coil portion 1220 may be located below the core 1210. Furthermore, outer layers 1300 and 1350, which are formed in the same or similar form as the second coil portion 1220, may be located below the second coil portion 1220 and connected to it in the vertical direction.

[0444] As yet another example, the sensing coil (SC) may be placed inside the heating coil (WC). In this case, at least one first coil substrate portion 1100 may be placed below the second coil substrate portion 1200, and at least one first coil substrate portion 1100 may also be placed above the second coil substrate portion 1200. Thus, the sensing coil (SC) may be placed inside the heating coil (WC) formed by the laminate of the first coil substrate portions 1100 by being placed between the laminates of the first coil substrate portions 1100.

[0445] On the other hand, the heating coil assembly 1000 of this embodiment may further include a second vertical connecting portion 1040. The second vertical connecting portion 1040 is provided so as to be able to connect in the vertical direction a coil substrate laminate 1010 having a second coil substrate portion 1200 and a second outer layer portion 1350 stacked in the vertical direction, or a coil substrate laminate 1010 having a plurality of second coil substrate portions 1200 stacked in the vertical direction.

[0446] Each coil module 1001, 1003 may include a plurality of second vertical connecting sections 1040. Each second vertical connecting section 1040 can connect a plurality of second coil sections 1220 arranged on the same straight line in the vertical direction in the vertical direction.

[0447] For example, if the second outer layer 1350 of the coil substrate laminate 1010 is laminated on top of the second coil substrate 1200, each second vertical connecting portion 1040 can penetrate the second outer layer 1350 and the second coil substrate 1200 in the vertical direction, and connect the second coil portion 1220 in the vertical direction. In this case, each sensing coil (SC) may be formed as a result of the second coil portion 1220 of the second outer layer 1350 and the second coil substrate 1200, which are laminated in the vertical direction, being connected in the vertical direction by the second vertical connecting portion 1040.

[0448] As another example, if multiple second coil portions 1220 in each coil substrate laminate 1010 are stacked vertically, each second vertical connecting portion 1040 can penetrate the multiple second coil substrate portions 1200 vertically and connect the second coil portions 1220 vertically. In this case, each sensing coil (SC) may be formed as a result of the second coil portions 1220 of multiple vertically stacked second coil substrate portions 1200 being connected vertically by the second vertical connecting portion 1040.

[0449] The second vertical connecting portion 1040 may be located in the area of ​​the second coil substrate portion 1200 where the first coil portion 1120 is not located, and may be connected laterally to the second coil portion 1220 or the outer layer portions 1300, 1350. Each of the second vertical connecting portions 1040 may include vias (V), similar to the first vertical connecting portion 1030.

[0450] Each via (V) can connect the outer layer portions 1300, 1350 and the second coil portion 1220 in the vertical direction, which are arranged on the same straight line in the vertical direction. Each of these vias (V) may be placed in an area of ​​the second coil substrate portion 1200 where the first coil portion 1120 is not located, and connected laterally to the second coil portion 1220 or the outer layer portions 1300, 1350.

[0451] According to this embodiment, at least one of the multiple second coil sections 1220 arranged in the horizontal direction may be positioned to overlap the non-patterned areas 1103 and 1105 of the first coil section 1120 in the vertical direction. In this case, at least a portion of the corresponding second coil section 1220 may be positioned to overlap the non-patterned areas 1103 and 1105 of the first coil section 1120 in the vertical direction.

[0452] More specifically, at least one of the multiple second coil sections 1220 arranged horizontally may be positioned to overlap the second non-patterned area 1105 in the vertical direction. In this case, at least a portion of the relevant second coil section 1220 may be positioned to overlap the second non-patterned area 1105 in the vertical direction.

[0453] Furthermore, the second vertical connecting portion 1040 connected to these second coil portions 1220 and the vias (V) included therein may be positioned to overlap the second non-pattern region 1105 in the vertical direction.

[0454] On the other hand, each heating coil (WC) may be arranged at a predetermined distance in the first direction from other heating coils (WC) adjacent in the first direction, and at a predetermined distance in the second direction from other heating coils (WC) adjacent in the second direction. That is, a separation space may be formed between two heating coils (WC) adjacent in the first direction, and a separation space may also be formed between two heating coils (WC) adjacent in the second direction.

[0455] According to this embodiment, at least one of the multiple second coil sections 1220 may be positioned so as to overlap vertically with the separation space formed between two adjacent heating coils (WC) in the second direction. In this case, at least a portion of the second coil section 1220 may be positioned so as to overlap vertically with the separation space.

[0456] Furthermore, the second vertical connecting portion 1040 connected to these second coil portions 1220 and the vias (V) included therein may be positioned to overlap the separation space in the vertical direction.

[0457] Typically, the formation of the second vertical connecting portion 1040 is carried out after the lamination of the first coil substrate portion 1100 and the second coil substrate portion 1200 has been completed in order to form the coil substrate laminate 1010. That is, with both the first coil substrate portion 1100 and the second coil substrate portion 1200 laminated, the holes (Va) are processed to form the vias (V) of the second vertical connecting portion 1040.

[0458] However, if the second vertical connecting portion 1040 is positioned to overlap the coil pattern (Cp) of the first coil portion 1120 in the vertical direction, the coil pattern (Cp) may be damaged by the drilling work required for processing the holes (Va). Therefore, if the formation of the second vertical connecting portion 1040 is carried out before the lamination work of the first coil substrate portion 1100 and the second coil substrate portion 1200, the formation work of the first vertical connecting portion 1030 and the formation work of the second vertical connecting portion 1040 must be carried out separately. In this case, the number of work hours and the manufacturing cost of the heating coil assembly 1000 will increase, which will be a problem.

[0459] Taking these points into consideration, in this embodiment, the second vertical connecting portion 1040 is positioned so as to overlap the non-patterned areas 1103 and 1105 of the first coil portion 1120 in the vertical direction. As a result, the second vertical connecting portion 1040 is positioned so as not to overlap the coil pattern (Cp) of the first coil portion 1120 in the vertical direction, and therefore the drilling work for forming the second vertical connecting portion 1040 does not affect the non-patterned areas 1103 and 1105 of the first coil portion 1120.

[0460] In other words, as illustrated in this embodiment, once the second vertical connecting portion 1040 is positioned, even if drilling is performed to form the second vertical connecting portion 1040 after the lamination of the first coil substrate portion 1100 and the second coil substrate portion 1200 has been completed to form the coil substrate laminate 1010, the possibility of damage to the coil pattern (Cp) occurring as a result becomes extremely low.

[0461] As a result, the heating coil assembly 1000 of this embodiment can effectively suppress damage to the coil pattern (Cp) caused by the process of forming vias (V), while suppressing an increase in the number of man-hours and manufacturing costs required for the production of the heating coil assembly 1000.

[0462] [Terminal structure] Figure 46 is an enlarged view showing a portion of the first coil substrate, Figure 47 is a view showing the second terminal and second terminal separated, and Figure 48 is a schematic cross-sectional view showing the laminated structure of the second terminal and second terminal shown in Figure 47.

[0463] Referring to Figures 7, 17, 20, and 44-48, the terminal section 1020 may be provided for connecting the power supply unit that supplies power and the heating coil (WC). For example, the terminal section 1020 may be electrically connected to the heating coil (WC) while also being electrically connected to the drive circuit 300 (see Figure 25) and the load circuit 350 (see Figure 25).

[0464] In the lateral direction, the terminal portion 1020 may be located on the outside of the assembly of multiple heating coils (WC). These terminal portions 1020 are provided so as to be connectable to at least one of the first terminal 1121 and the second terminal 1122.

[0465] The terminal portion 1020 may include a first terminal 1021. The first terminal 1021 is connected to a first terminal 1121. These first terminals 1021 may be connected to a heating coil (WC) via the first terminal 1121.

[0466] Furthermore, the terminal section 1020 may include a second terminal 1023. The second terminal 1023 is connected to the second terminal 1122. These second terminals 1023 may also be connected to the heating coil (WC) via the second terminal 1122.

[0467] The first terminal 1121 and the second terminal 1122 may be provided on the first coil substrate portion 1100 and the first outer layer portion 1300, respectively. That is, the first terminal 1121 and the second terminal 1122 may be formed on the same layer as the layer on which the first coil portion 1120 is formed.

[0468] In this embodiment, multiple heating coils (WC) may be arranged in a matrix in each coil module 1001, 1003. That is, multiple heating coils (WC) may be arranged in a first direction, and multiple heating coils (WC) may also be arranged in a second direction.

[0469] For example, each terminal section 1020 may include a plurality of first terminals 1021 arranged in the first direction. Also, in each coil module 1001, 1003, a plurality of adjacent heating coils (WC) in the second direction may be connected to operate simultaneously.

[0470] According to this, each first terminal 1021 may be connected to one heating coil (WC). The second terminal 1023 may be connected to a plurality of adjacent heating coils (WC) in the second direction.

[0471] For example, if multiple heating coils (WC) are arranged in a 2x4 configuration in each coil module 1001, 1003, each coil module 1001, 1003 may be provided with a pair of terminals 1020. This pair of terminals 1020 may be spaced apart in a first direction via the assembly of multiple heating coils (WC). That is, one of the terminals 1020 may be positioned on the front side of the assembly of multiple heating coils (WC), and the other terminal may be positioned on the rear side of the assembly of multiple heating coils (WC).

[0472] In each coil module 1001, 1003, multiple heating coils (WC) can be divided in half in a 2x2 configuration, and each terminal section 1020 may be connected to an adjacent 2x2 configuration of heating coils (WC). For example, one of a pair of terminal sections 1020 located on the front side may be connected to four heating coils (WC) located on the front side of the coil module 1001, 1003, and one of a pair of terminal sections 1020 located on the rear side may be connected to four heating coils (WC) located on the rear side of the coil module 1001, 1003.

[0473] As described above, the first terminal 1121 may be connected to the outermost lateral end of the heating coil (WC), and the second terminal 1122 may be connected to the innermost end of the heating coil (WC). For example, each first terminal 1121 may be positioned offset toward the terminal portion 1020 to which it is connected.

[0474] In other words, with respect to the second direction, each first terminal 1121 may be positioned closer to the end than to the center of the heating coil (WC), but may be positioned biased toward the terminal portion 1020 to which it is connected. For example, the first terminals 1121 provided on four heating coils (WC) adjacent to the front-facing terminal portion 1020 of a pair may be positioned biased toward the front on the heating coil (WC).

[0475] In this embodiment, each terminal portion 1020 may include a pair of first terminals 1021 arranged in a first direction. Each first terminal 1021 may be connected to only one heating coil (WC) by being connected to one first terminal 1121. Each of these first terminals 1021 can electrically connect one heating coil (WC) to a power supply unit, for example, a drive circuit 300 and a load circuit 350.

[0476] The second terminal 1023 can connect the heating coil (WC) to ground. These second terminals 1023 may also be connected to a pair of adjacent second terminals 1122 in the second direction. That is, the second terminal 1023 can connect a pair of adjacent heating coils (WC) in the second direction to ground.

[0477] Furthermore, each terminal portion 12020 may further include a third terminal 1025. The third terminal 1025 can connect the heating coil (SC) to the power supply unit. These third terminals 1025 may be provided on the second outer layer portion 1350 and also on the second coil substrate portion 1200.

[0478] For example, the terminal portion 1020 may be provided on the first coil substrate portion 1100, the second coil substrate portion 1200, and the outer layers 1300 and 1350, which are stacked in the vertical direction. For instance, the first terminals 1021 provided on the first coil substrate portion 1100, the second coil substrate portion 1200, the first outer layer portion 1300, and the second outer layer portion 1350, which are stacked in the vertical direction, may be electrically connected via vias (V).

[0479] Furthermore, the second terminals 1023 provided on the first coil substrate portion 1100, the second coil substrate portion 1200, the first outer layer portion 1300, and the second outer layer portion 1350, respectively, are stacked in the vertical direction, and the second terminals 1023 stacked in the vertical direction in this manner may be electrically connected via vias (V).

[0480] As another example, the terminal portion 1020 may be provided only on the second outer layer portion 1350. That is, the terminal portion 1020 may be located only at the upper end of the coil modules 1001 and 1003.

[0481] In this embodiment, each coil module 1001, 1003 includes a plurality of sensing coils (SCs), and the plurality of sensing coils (SCs) may be arranged at predetermined intervals along a first direction. Furthermore, the second outer layer 1350 and the second coil substrate 1200 may include a first terminal 1121 and a second terminal 1122, respectively, similar to the first coil substrate 1100. That is, the first terminal 1121 and the second terminal 1122 may be formed in the same layer as the layer on which the second coil portion 1220 is formed.

[0482] Furthermore, at least one of the first terminal 1121 and the second terminal 1122 may include vias (V). In this embodiment, it is exemplified that the first terminal 1121 and the second terminal 1122 each include multiple vias (V), and that the multiple vias (V) in the first terminal 1121 and the second terminal 1122 are arranged laterally.

[0483] In this embodiment, the first terminals 1121 provided on the first coil substrate portion 1100, the second coil substrate portion 1200, and the second outer layer portion 1350 are stacked in the vertical direction, and the first terminals 1121 stacked in this vertical direction may be electrically connected via vias (V). Similarly, the second terminals 1122 provided on the first coil substrate portion 1100 and the second coil substrate portion 1200 are also stacked in the vertical direction, and the second terminals 1122 stacked in this vertical direction may be electrically connected via vias (V).

[0484] For example, each via (V) can penetrate vertically through the first coil substrate section 1100 and the second coil substrate section 1200, which are stacked vertically. Vias (V) provided at the first terminal 1121 can connect multiple first terminals 1121 arranged in the same straight line vertically. Vias (V) provided at the second terminal 1122 can connect multiple second terminals 1122 arranged in the same straight line vertically.

[0485] Furthermore, at least one of the second coil substrate portion 1200 and the second outer layer portion 1350 may include a first wiring pattern (Wpa) and a second wiring pattern (Wpb). For example, the first wiring pattern (Wpa) and the second wiring pattern (Wpb) may be formed on the second coil substrate portion 1200 and the second outer layer portion 1350, respectively. As another example, the first wiring pattern (Wpa) and the second wiring pattern (Wpb) may be formed only on the second outer layer portion 1350.

[0486] In this embodiment, a first wiring pattern (Wpa) and a second wiring pattern (Wpb) are formed on the second coil substrate portion 1200 and the second outer layer portion 1350, respectively. According to this, the first wiring pattern (Wpa) is provided on the vertically outer side of the first coil substrate portion 1100 so as to be able to electrically connect the first terminal 1021 and the first terminal 1121. The second wiring pattern (Wpb) is provided on the vertically outer side of the first coil substrate portion 1100 so as to be able to electrically connect the second terminal 1023 and the second terminal 1122.

[0487] In other words, the first wiring pattern (Wpa) may be electrically connected to a first terminal 1121 provided on at least one of the second coil substrate portion 1200 and the second outer layer portion 1350, thereby electrically connecting to the heating coil (WC) formed on the first coil substrate portion 1100. The second wiring pattern (Wpb) may be electrically connected to a second terminal 1122 provided on at least one of the second coil substrate portion 1200 and the second outer layer portion 1350, thereby electrically connecting to the heating coil (WC) formed on the first coil substrate portion 1100.

[0488] In this embodiment, each sensing coil (SC) may be positioned to overlap vertically with the second non-pattern region 1105 or the separation space. Each of these sensing coils (SC) may be positioned so as not to overlap vertically with the first terminal 1121 and the second terminal 1122, and not to be collinear with the first terminal 1121 and the second terminal 1122 in the second direction.

[0489] That is, in each coil module 1001, 1003, a pair of sensing coils (SC) may be arranged spaced apart along the first direction via the second terminal 1122. For example, the second wiring pattern (Wpb) extends in the second direction at the second terminal 1023, but may extend in the second direction via a path passing between the pair of sensing coils (SC) at the second terminal 1023.

[0490] Furthermore, at least one of the second coil substrate portion 1200 and the second outer layer portion 1350 may further include a third wiring pattern (Wpc). The third wiring pattern (Wpc) may be formed on both the second coil substrate portion 1200 and the second outer layer portion 1350, or it may be formed only on the second outer layer portion 1350. These third wiring patterns (Wpc) are provided so as to be able to electrically connect the heating coil (SC) and the third terminal 1025.

[0491] As described above, the multiple heating coils (WC) and sensing coils (SC) provided in the coil modules 1001 and 1003 may be connected to the terminal section 1020 via wiring patterns (Wpa, Wpb, Wpc) within the coil modules 1001 and 1003, and may also be connected to the electrical section 170 (see Figure 4) via this terminal section 1020.

[0492] In other words, the wiring for connecting the heating coil (WC) and sensing coil (SC) to the terminal section 1020 is formed in a patterned form on the coil modules 1001 and 1003 themselves, so that the connection between the heating coil (WC) and sensing coil (SC) and the electrical section 170 is achieved solely by connecting the terminal section 1020 to the electrical section 170.

[0493] According to this, the heating coil (WC) and sensing coil (SC) can be connected to the electrical unit 170 by simply and easily connecting the terminal unit 1020 and the electrical unit 170, and the connection structure between the heating coil (WC) and sensing coil (SC) and the electrical unit 170 can be formed very simply.

[0494] Furthermore, since the heating coil (WC) and sensing coil (SC) are connected to the electrical unit 170, no separate wiring work is required. This not only makes the connection between the heating coil assembly 1000 and the electrical unit 170 easier and quicker, but also prevents the internal storage space of the cooktop 100, which houses the heating coil assembly 1000 and the electrical unit 170, from becoming complicated by numerous wires.

[0495] [Structure of masks and dummy vias] Figure 49 shows the heating coil assembly covered with a mask, and Figure 50 is a schematic cross-sectional view showing an example of the laminated structure of the heating coil assembly shown in Figure 49. Figure 51 is a schematic cross-sectional view showing the heating coil assembly covered with a top plate, and Figure 52 is a schematic cross-sectional view showing another example of the laminated structure of the heating coil assembly shown in Figure 49.

[0496] Referring to Figures 44 and 49 to 51, the heating coil assembly 1000 of this embodiment may further include a mask 1500. The mask 1500 is provided to cover the outermost surface of the coil substrate laminate 1010 in the vertical direction.

[0497] In other words, the mask 1500 is provided so as to be able to cover the upper and lower end surfaces of the coil modules 1001 and 1003. These masks 1500 can form the surface of the coil modules 1001 and 1003 and can form a heat-resistant covering that protects various patterns, such as coil patterns (Cp), wiring patterns (Wpa, Lpb), and vias (V), which are arranged on the upper and lower end surfaces of the coil modules 1001 and 1003.

[0498] As an example, the mask 1500 can cover patterns or vias (V) arranged on the outermost surface of the coil substrate laminate 1010 and form irregularities corresponding to the irregularities of the patterns or vias (V). That is, the upper and lower end surfaces of the coil modules 1001 and 1003 formed by the mask 1500 may include irregularities corresponding to the shapes of the patterns or vias (V) arranged on the outermost surface of the coil substrate laminate 1010.

[0499] The mask 1500 described above is provided to cover the upper and lower surfaces of the coil modules 1001 and 1003 so that the various patterns arranged on the upper and lower surfaces of the coil modules 1001 and 1003 are not exposed to the outside of the coil modules 1001 and 1003. This prevents solder from unnecessarily adhering to the circuit patterns formed on the coil modules 1001 and 1003, thereby protecting the surface of the coil modules 1001 and 1003.

[0500] The mask 1500 may be formed by solder resist printed on the outermost surface in the vertical direction of the coil substrate laminate 1010. For example, the mask 1500 may be formed as a result of photosolder resist ink printed on the upper and lower surfaces of the coil modules 1001 and 1003 curing with ultraviolet light.

[0501] According to this embodiment, a top plate 120 may be placed on the outer side of the coil modules 1001 and 1003 in the vertical direction. That is, the coil modules 1001 and 1003 may be covered by a top plate 120 placed on top of the coil modules 1001 and 1003. As an example, the top plate 120 may be made of a transparent or translucent material that can transmit light, such as glass or acrylic.

[0502] A cover portion 123 may be formed on one side of the top plate 120 in the vertical direction, covering the mask 1500 from the outside in the vertical direction. For example, a cover portion 123 may be formed on the bottom surface of the top plate 120, and this cover portion 123 can cover the mask 1500 from above. As an example, the cover portion 123 may be a printed layer or coating layer formed on the bottom surface of the top plate 120 facing the mask 1500.

[0503] In this embodiment, a light display area 121 is formed on the top plate 120, and the cover portion 123 may be placed in an area where the light display area 121 is not located. For example, the cover portion 123 may be formed over most of the top plate 120, and the light display area 121 may be formed only in a portion of the top plate 120 in order to illuminate the upper part of the top plate 120 with light emitted from the lighting module 180.

[0504] For this reason, the light display area 121 may be formed with higher transparency than the cover portion 123. For example, the cover portion 123 may be formed in an opaque state that almost does not transmit light. For example, the cover portion 123 may be formed in a low-luminosity color with a grayscale brightness of 0 to 3. For example, the cover portion 123 may be formed in an achromatic color, more specifically black.

[0505] The mask 1500 may be formed in a color similar to that of the cover portion 123. That is, the mask 1500 may be formed in a color that is not easily distinguishable from the color of the cover portion 123. For example, the mask 1500 may be formed in the same hue as the cover portion 123.

[0506] For example, the mask 1500 may be formed with a low-luminosity color whose lightness on the grayscale is between 0 and 3. For instance, if the cover portion 123 is formed with a low-luminosity color, the mask 1500 may also be formed with the same or a similar low-luminosity color.

[0507] In this embodiment, the mask 1500 is shown to be formed in achromatic color. In this case, the cover portion 123 may be formed in achromatic color, and the mask 1500 may also be formed in achromatic color.

[0508] For example, the mask 1500 may be formed in black. In this case, the cover portion 123 may be formed in black, and the mask 1500 may also be formed in black. As a result, the surfaces of the coil modules 1001 and 1003 may be formed in black, which is the same color as or similar to the color of the cover portion 123.

[0509] In this way, by forming the surfaces of the coil modules 1001 and 1003 with a color identical or similar to the hue of the cover portion 123, the heating coil assembly 1000 becomes less visible from the outside of the cooktop 100. Furthermore, by forming the surfaces of the coil modules 1001 and 1003 with a dark color such as black, the heating coil assembly 1000, which is placed in the dark interior space of the cooktop 100, becomes less conspicuous.

[0510] In other words, by using a mask 1500 formed in the same or similar color as the cover portion 123, the heating coil assembly 1000 can be installed inside the cooktop 100 in such a way that it is not easily visible from the outside of the cooktop 100, thereby effectively suppressing the deterioration of the aesthetic appearance of the cooking appliance caused by the heating coil assembly 1000.

[0511] For example, the mask 1500 may be formed before the vias (V) are formed. That is, the mask 1500 may be formed first on the upper and lower outer surfaces of the coil substrate laminate 1010, and then the vias (V) may be formed. In this case, at least a portion of the vias (V) may be exposed to the outside of the mask 1500. For example, the ends of the vias (V), for example, the land portion (Vc), may be exposed to the outside of the coil substrate laminate 1010 covered by the mask 1500.

[0512] As another example, as shown in Figure 52, vias (V) may be formed before mask 1500 is formed. That is, vias (V) may be formed first, and then mask 1500 may be formed. In this case, vias (V) may be provided covered by mask 1500.

[0513] On the other hand, referring to Figures 21 and 52, the coil module may further include dummy vias (DVs). The dummy vias (DVs) may be located in non-patterned areas 1103 and 1105 and may be formed in a manner that includes holes penetrating the coil substrate laminate 1010 in the vertical direction.

[0514] For example, a dummy via (DV) may be provided in a form similar to a via (V; see Figure 50). For instance, a dummy via (DV) may be formed in a form including a hole (Va; see Figure 50), an inner wall (Vb; see Figure 50), and a land (Vc; see Figure 50).

[0515] Furthermore, dummy vias (DV) may be formed electrically isolated from various circuit patterns such as coil patterns (Cp) and wiring patterns (Wpa, Wpb, Wpc) that form heating coils (WC) or sensing coils (SC). These dummy vias (DV) do not serve a role in power supply or signal transmission, but can serve a role in heat dissipation for the coil module.

[0516] Since the dummy vias (DV) are placed in non-patterned regions 1103 and 1105, they may be positioned so as not to come into contact with or overlap the coil patterns (Cp) that form the heating coils (WC) or sensing coils (SC) in the vertical direction.

[0517] For example, multiple dummy vias (DV) may be placed in the first non-patterned area 1103 and the second non-patterned area 1105, respectively, and these dummy vias (DV) may be arranged so as not to come into contact with or overlap with various circuit patterns such as coil patterns (Cp) or wiring patterns (Wpa, Wpb, Wpc) in the vertical direction.

[0518] The dummy vias (DVs) provided in this manner do not interfere with the power supply or signal transmission of the various circuit patterns provided on the coil module, and can also play a role in improving the heat dissipation performance of the coil module.

[0519] For example, the dummy via (DV) may be formed after the mask 1500 is formed. For instance, the via (V) may be formed before the mask 1500 is formed, and the dummy via (DV) may be formed after the mask 1500 is formed. In this case, the via (V) may be covered by the mask 1500, and the dummy via (DV) may be exposed to the outside of the mask 1500. In this case, the conductors forming the inner wall and land portions of the dummy via (DV) may be exposed to the outside of the mask 1500 through the upper end of the dummy via (DV).

[0520] In the configuration described above, the stability of vias (V) connected to heating coils (WC), etc., can be improved, and dummy vias (DV) can provide even better heat dissipation performance.

[0521] As another example, for convenience of the process, the formation of vias (V) and dummy vias (DV) may both be performed after the formation of mask 1500. As yet another example, the formation of mask 1500 may be performed after the formation of vias (V) and dummy vias (DV) has both been performed.

[0522] [Manufacturing method for coil substrate laminates] Figure 53 is a flowchart schematically showing the manufacturing process of a coil substrate laminate according to one embodiment of the present invention, and Figure 54 is a flowchart schematically showing the progress of the linking stage shown in Figure 53.

[0523] As described above, the heating coil assembly 1000 may be formed as a result of stacking a first coil substrate portion 1100 and a second coil substrate portion 1200, etc., along the vertical direction. These heating coil assemblies 1000 include a heating coil (WC) and a sensing coil (SC). The heating coil (WC) may be formed as a result of connecting a plurality of first coil portions 1120, each provided on the first coil substrate portion 1100, in the vertical direction, and the sensing coil (SC) may be formed by at least one second coil portion 1220 provided on the second coil substrate portion 1200.

[0524] To manufacture the heating coil assembly 1000 as described above, as shown in Figures 50 and 53, the first step may be to form coil portions 1120 and 1220 on each of the coil substrate portions 1100 and 1200 (S10; coil formation step).

[0525] In the coil formation stage (S10), multiple first coil portions 1120 may be formed on each first coil substrate portion 1100, and multiple second coil portions 1220 may be formed on each second coil substrate portion 1200. Furthermore, the first coil portions 1120 may be formed on the upper and lower surfaces of the first coil substrate portion 1100, and the second coil portions 1220 may be formed on the upper and lower surfaces of the second coil substrate portion 1200.

[0526] As an example, the coil substrate portions 1100, 1200 may be formed from a copper foil laminate including cores 1110, 1210 and copper foil laminated on both the upper and lower sides of the cores 1110, 1210. In this case, each coil pattern (Cp) forming the coil portions 1120, 1220 may be formed as a result of the foil laminated on the cores 1110, 1210 being patterned into a coil shape.

[0527] As an example, the coil pattern (Cp) can be formed through a process that involves dry film application, exposure, development, and etching.

[0528] For example, after attaching a dry film to a copper foil laminate, if the dry film is irradiated with ultraviolet light, the portion of the photoresist in the dry film that has been exposed to ultraviolet light will harden (expose). The portion of the photoresist that has not hardened is removed during the development process, and when the foil in the portion where the photoresist has been removed is removed by etching, a coil pattern (Cp) may be formed on the coil substrate portions 1100 and 1200.

[0529] As described above, once a coil pattern (Cp) and coil sections 1120 and 1220 containing the Cp are formed in each of the coil substrate sections 1100 and 1200, these multiple coil substrate sections 1100 and 1200 can be stacked vertically to form a coil substrate laminate 1010 (S20; stacking stage).

[0530] In the lamination stage (S20), the coil substrate portions 1100, 1200 and the adhesive 1400 may be laminated in the vertical direction. In this case, the lamination of the coil substrate portions 1100, 1200 and the adhesive 1400 may be carried out so that the coil substrate portions 1100, 1200 and the adhesive 1400 are alternately arranged in the vertical direction.

[0531] For example, the adhesive 1400 may include at least one prepreg film (F). For instance, the adhesive 1400 may be formed in a form in which multiple prepreg films are laminated vertically. That is, multiple prepreg films are laminated vertically to form the adhesive 1400, and this adhesive 1400 may be interposed between the vertically laminated coil substrate portions 1100 and 1200.

[0532] As described above, when the coil substrates 1100 and 1200 and the adhesive 1400 are stacked vertically, heating and pressurizing them causes the adhesive 1400 interposed between the vertically stacked coil substrates 1100 and 1200 to melt and then harden, thereby joining the coil substrates 1100 and 1200 together. As a result, multiple coil substrates 1100 and 1200 and the adhesive 1400 become one, and a single coil substrate laminate 1010 having multiple coil sections 1120 and 1220 is formed.

[0533] In the coil substrate laminate 1010 formed as described above, the coil portions 1120, 1220 and the insulating layer may be arranged alternately in the vertical direction. In this case, in each coil substrate portion 1100, 1200, an insulating layer may be formed by the core 1110, 1210 placed between the pair of coil portions 1120, 1220, and an insulating layer may also be formed by the adhesive 1400 placed between the coil substrate portions 1100, 1200.

[0534] For example, the thickness of each coil section 1120, 1220 may be set to 0.10 mm to 0.11 mm, and the thickness of each prepreg film placed between a pair of coil sections 1120, 1220 arranged vertically may be set to 0.05 mm to 0.09 mm. Furthermore, each adhesive 1400 placed between a pair of coil sections 1120, 1220 arranged vertically may be formed by three prepreg films (F) laminated vertically.

[0535] For example, the thickness of each prepreg film (F) may be set to 0.06 mm to 0.08 mm, and each adhesive 1400 may be formed from three prepreg films (F).

[0536] As another example, the thickness of each prepreg film (F) may be set to 0.07 mm to 0.09 mm. Furthermore, each adhesive 1400, which is placed between a pair of coil sections 1120, 1220 arranged in the vertical direction, may be formed by four prepreg films (F) stacked in the vertical direction.

[0537] Each adhesive material 1400 formed in the manner described above effectively fills the spaces formed in each coil substrate portion 1100, 1200 as a result of the foil being removed by etching, thereby joining the coil substrate portions 1100, 1200 together.

[0538] Furthermore, in the lamination stage (S20), not only the multiple coil substrate portions 1100, 1200 but also the pair of outer layer portions 1300, 1350 may be laminated together. That is, the multiple coil substrate portions 1100, 1200 and the pair of outer layer portions 1300, 1350 may be laminated together such that the multiple coil substrate portions 1100, 1200 are arranged between the pair of outer layer portions 1300, 1350. This allows the pair of outer layer portions 1300, 1350 to form the upper and lower ends of the coil substrate laminate 1010.

[0539] The outer layers 1300 and 1350 may be bonded to the coil substrates 1100 and 1200 by an adhesive 1400 placed between the outer layers 1300 and 1350 and the coil substrates 1100 and 1200. The adhesive 1400 can form an insulating layer between the coils 1120 and 1220 and the outer layers 1300 and 1350, thereby bonding the coil substrate laminate 1010 to the outer layers 1300 and 1350.

[0540] As described above, with the coil substrate laminate 1010 formed, outer layers 1300 and 1350 can be formed on the outer sides of the coil substrate laminate 1010 in the vertical direction (S30; outer coil formation stage). In the outer coil formation stage (S30), the outer layers 1300 and 1350 may be formed by processing foil into a coil shape.

[0541] The outer layers 1300 and 1350 can be formed in the same way as the coil sections 1120 and 1220, through a process of dry film application, exposure, development, and etching, and a detailed explanation of this process is omitted.

[0542] For example, if a coil substrate laminate 1010 is formed in which a second coil section 1220 is stacked on top of a plurality of first coil sections 1120, the outer layers 1300 and 1350 positioned above the second coil substrate section 1200 are formed in the same form as the second coil section 1220 and can form a sensing coil (SC) together with the second coil section 1220, and the outer layers 1300 and 1350 positioned below the first coil substrate section 1100 are formed in the same form as the first coil section 1120 and can form a heating coil (WC) together with the first coil section 1120.

[0543] As described above, after the coil substrate laminate 1010 is formed, the multiple coil sections 1120, 1220 stacked in the vertical direction may be connected in the vertical direction (S40; connection stage).

[0544] In the connection stage (S40), as shown in Figures 50 and 54, first, a hole (Va) is formed to connect to a plurality of coil sections 1120, 1220 stacked in the vertical direction (S41; hole processing stage). The hole (Va) is formed in the shape of a hole that penetrates the coil substrate stack 1010 in the vertical direction, and the hole (Va) may be formed by drilling the coil substrate stack 1010 in the vertical direction to process the hole.

[0545] After the hole (Va) is formed, vias (V) can be formed in the hole (Va) formed as described above, and multiple coil sections 1120, 1220 may be connected vertically by these vias (V) (S43; via formation stage).

[0546] For example, a heating coil (WC) may be formed by connecting a plurality of first coil sections 1120 vertically with a first vertical connecting section 1030 formed by the via (V). Alternatively, a sensing coil (SC) may be formed by connecting a plurality of second coil sections 1220 vertically with a second vertical connecting section 1040 formed by the via (V).

[0547] Each via (V) may be formed in a manner that includes an inner wall portion (Vb) and a land portion (Vc). For example, an inner wall portion (Vb) may be formed as a result of plating a conductive metal, such as copper foil, on the inner wall of the coil substrate portions 1100, 1200 surrounding the hole portion (Va), and a land portion (Vc) may be formed as a result of plating copper foil on the upper and bottom surfaces of the coil substrate portions 1100, 1200 so as to be connected to the inner wall portion (Vb).

[0548] As described above, after the heating coil (WC) and sensing coil (SC) have been formed, a mask 1500 can be formed on the outer side in the vertical direction of the coil substrate laminate 1010 (S50; mask formation stage).

[0549] In the mask formation stage (S50), the mask 1500 is provided so as to be able to cover the upper and lower end surfaces of the coil modules 1001 and 1003. These masks 1500 can form a heat-resistant coating that protects the various circuit patterns arranged on the upper and lower end surfaces of the coil modules 1001 and 1003.

[0550] As another example, the mask 1500 may be formed after the via (V) has been formed, as shown in Figure 52. In this case, the via (V) may be provided covered by the mask 1500.

[0551] As yet another example, via (V) may be formed before the mask 1500 is formed, and dummy via (DV; see Figure 21) may be formed after the mask 1500 is formed. In this case, via (V) may be covered by the mask 1500, and dummy via (DV) may be exposed to the outside of the mask 1500. In this case, the conductors forming the inner wall and land portions of the dummy via (DV) may be exposed to the outside of the mask 1500 through the upper end of the dummy via (DV).

[0552] As another example, the formation of vias (V) and dummy vias (DV) may both be performed after the formation of mask 1500, or the formation of mask 1500 may be performed after both the formation of vias (V) and dummy vias (DV) have been performed.

[0553] [Example of a heating coil assembly] Figure 55 is an example of a heating coil assembly according to one embodiment of the present invention, Figure 56 is a diagram showing the first coil module shown in Figure 55 separated, and Figure 57 is a diagram showing the second coil module shown in Figure 55 separated. Figure 58 is a diagram showing the heating coil shown in Figure 55 separated, and Figure 59 is a schematic cross-sectional view showing an example of the per-turn arrangement structure of the first coil section. Figure 60 is a schematic cross-sectional view showing another example of the per-turn arrangement structure of the first coil section, and Figure 61 is an enlarged cross-sectional view showing the laminated structure of the heating coil assembly.

[0554] Below, an example of a heating coil assembly is illustrated with reference to Figures 55 to 60.

[0555] Referring to Figures 55 to 57, the heating coil assembly 1000 in this embodiment may include a plurality of coil modules 1001, 1003. In this embodiment, it is illustrated that a pair of first coil modules 1001 and one second coil module 1003 are arranged in a first direction.

[0556] The first coil module 1001 and the second coil module 1003 may each contain multiple heating coils (WC). For example, each first coil module 1001 may contain eight heating coils (WC) arranged in a 2x4 configuration, and the second coil module 1003 may contain six heating coils (WC) arranged in a 2x3 configuration. In other words, the heating coil assembly 1000 may contain a total of 22 heating coils (WC).

[0557] For example, the heating coil assembly 1000 may be formed in a polygonal shape with a length (a1) of 920 mm to 940 mm in the first direction and a length (b1) of 525 mm to 545 mm in the second direction. The first coil module 1001 forming these heating coil assemblies 1000 may be formed in a rectangle with a length (a2) of 245 mm to 255 mm in the first direction and a length (b2) of 400 mm to 410 mm in the second direction. The second coil module 1003 may be formed in a rectangle with a length (a3) ​​of 245 mm to 255 mm in the first direction and a length (b3) of 300 mm to 310 mm in the second direction.

[0558] Referring to Figure 58, each heating coil (WC) provided in the coil modules 1001 and 1003 may be formed in a substantially square spiral shape. The outer shape of each of these heating coils (WC) may also be substantially rectangular.

[0559] For example, the outer shape of the heating coil (WC) may be a rectangle with rounded corners. In these forms of heating coils (WC), the direction change section of the coil pattern (Cp) may be formed in a curved shape. That is, the straight section in the left-right direction and the straight section in the front-back direction of the coil pattern (Cp) can be smoothly connected by a curve.

[0560] Furthermore, when the corners of the heating coil (WC) are rounded, the change in cross-sectional area becomes more gradual compared to when the corners of the heating coil (WC) are angular, thereby reducing the resistance of the heating coil (WC). In other words, a heating coil (WC) with rounded corners can generate less heat compared to a heating coil with angular corners.

[0561] As another example, the outer shape of the heating coil (WC) may be a rectangle with angular corners. A heating coil (WC) formed in this way can increase the length of the helix formed by the heating coil (WC), thereby increasing the pattern cross-sectional area per turn of the heating coil (WC).

[0562] In this embodiment, the outer shape of the heating coil (WC) is exemplified as a rectangle with different lengths in the first and second directions. As another example, the outer shape of the heating coil (WC) may be a square. Heating coils (WC) formed in these forms have the advantage of making the production design of the heating coil (WC) easier.

[0563] The outer shape of each heating coil (WC) may be a rectangle with a length (b4) of 60mm to 120mm and a width (a4) of 80mm to 130mm. That is, the outer shape of each heating coil (WC) may be a rectangle with a length (a4) of 80mm to 130mm in the first direction and a length (b4) of 60mm to 120mm in the second direction.

[0564] For example, the outer shape of each heating coil (WC) may be a rectangle with a length of 95 mm to 125 mm in the first direction and a length of 90 mm to 110 mm in the second direction. These heating coils (WC) may be formed as a result of winding the coil pattern (Cp) nine or more times around the first non-patterned region 1103. For example, the above-described heating coil (WC) may be formed as a result of winding the coil pattern (Cp) nine to eleven times around the first non-patterned region 1103.

[0565] In this case, the width (w) of each coil pattern (Cp) may be 0.2 mm to 0.4 mm, as shown in Figures 50, 58, and 59. The spacing (d) between multiple coil patterns (Cp) may also be 0.2 mm to 0.4 mm.

[0566] In these coil modules 1001 and 1003, the first coil portion 1120 may be arranged in a vertical direction, with multiple first coil substrate portions 1100 stacked vertically. In this embodiment, it is exemplified that the first coil portion 1120 is arranged in 10 or more layers along the vertical direction. For example, the first coil portion 1120 may be arranged in 10 to 12 layers along the vertical direction.

[0567] However, the present invention is not limited thereto, and the number of layers of the first coil section 1120 may be set to more than 12 layers depending on design conditions such as the thickness of the product, the required power, and the amount of heat generated.

[0568] According to this embodiment, 10 to 12 first coil sections 1120 arranged on the same straight line in the vertical direction can be connected in the vertical direction to form a single heating coil (WC). For this reason, multiple coil patterns (Cp) arranged on the same straight line in the vertical direction may be connected in the vertical direction.

[0569] More specifically, the outer shape of each heating coil (WC) may be a rectangle with a length of 100 mm to 125 mm in the first direction and a length of 85 mm to 95 mm in the second direction. These heating coils (WC) may be formed as a result of winding a coil pattern (Cp) nine or more times around a first non-patterned region 1103.

[0570] As an example, the coil pattern (Cp) may be wound 9 to 11 times around the first non-patterned region 1103, and the outer shape of the heating coil (WC) may be a rectangle with a length of 100 mm to 110 mm in the first direction and a length of 88 mm to 100 mm in the second direction. As another example, the outer shape of the heating coil (WC) may be a rectangle with a length of 115 mm to 125 mm in the first direction and a length of 88 mm to 100 mm in the second direction.

[0571] In this case, the width (w) of each coil pattern (Cp) may be 0.25 mm to 0.35 mm. The spacing (d) between multiple coil patterns (Cp) may also be 0.25 mm to 0.35 mm. In these coil modules 1001 and 1003, multiple first coil substrates 1100 may be stacked vertically so that the first coil sections 1120 are arranged in 10 layers along the vertical direction.

[0572] In this case, ten first coil sections 1120 arranged on the same straight line in the vertical direction can be connected vertically to form a single heating coil (WC). For this reason, multiple coil patterns (Cp) arranged on the same straight line in the vertical direction may be connected vertically.

[0573] As described above, each heating coil (WC) may be formed as a result of winding a coil pattern (Cp) 9 to 11 turns, more specifically 11 turns, around the first non-patterned region 1103. Each heating coil (WC) may have 3 to 6 coil patterns (Cp) arranged in each layer. Here, "turn" means the number of turns of the coil pattern (Cp), and may also be expressed as "winding" or "times". For example, "11 turns" may be expressed as "11 windings" or "11 times".

[0574] When each heating coil (WC) is cut in the vertical direction, the cross-section of the heating coil (WC) in the vertical direction may show that the multiple coil patterns (Cp) contained within the heating coil (WC) are divided into multiple units along the radial direction of the spiral formed by the heating coil (WC) (hereinafter referred to as the "radial direction").

[0575] In this case, each unit may be divided based on the division region 1120a. For example, if each first coil section 1120 contains four coil patterns (Cp), then each division region 1120a may contain four coil patterns (Cp) arranged along the diametrical direction, and each unit may contain four rows of coil patterns (Cp). Also, if each heating coil (WC) contains ten layers of coil patterns (Cp), each unit may contain four rows of coil patterns (Cp).

[0576] The sum of the vertical cross-sectional areas of each individual coil pattern (Cp), that is, the pattern cross-sectional area per turn of the heating coil (WC), can satisfy the following relationship.

[0577] 1 ≤ S = I / D, 15≦D≦20, 15 ≤ I ≤ 20, D = P * m * n

[0578] (However, S is the pattern cross-sectional area per turn of the heating coil (mm²) 2 ), I is the current flowing through the heating coil at maximum output, and D is the current density (A / mm²) flowing through the heating coil at maximum output. 2 ), P is the cross-sectional area (mm²) of each coil pattern. 2 (where m is the number of coil layers in each heating coil, and n is the number of coil patterns in each coil layer.)

[0579] According to this embodiment, the pattern cross-sectional area (S) per turn of the heating coil (WC) is such that the current density (D; hereinafter referred to as "current density") flowing through the heating coil (WC) at the maximum output of the Cooktop 100 is 15 A / mm². 2~20A / mm 2 is set to fall within the range of

[0580] As an example, when the maximum output of a cooktop 100 including 22 heating coils (WC) is 3.6kW, and the current (I) flowing through each heating coil (WC) is 15A to 20A at this time, the current density (D) is 15A / mm 2 ~20A / mm 2 The pattern cross-sectional area (S) per turn of the heating coil (WC) may be set so as to fall within the range of

[0581] When the pattern cross-sectional area (S) per turn of the heating coil (WC) satisfies these conditions, the frequency of the current flowing through each heating coil (WC) can be maintained at a low level. If the frequency of the current flowing through the heating coil (WC) can be maintained at a low level, the temperature rise of the heating coil (WC) can be effectively suppressed

[0582] For example, as described above, the current density (D) is 15A / mm 2 ~20A / mm 2 When the pattern cross-sectional area (S) per turn of the heating coil (WC) is set to fall within the range of, the frequency of the current flowing through the heating coil (WC) can be maintained at 90kHz or lower, whereby even when the heating coil (WC) is operated continuously for 10 minutes or more, the temperature of the heating coil (WC) can be maintained at 150°C or lower

[0583] As a result of a water boiling test, when a cooking appliance heats 6 liters of water within 11 minutes, the cooking appliance can be determined to have relatively excellent conditions in the water boiling test. That is, in order for the cooking appliance of the present embodiment to provide performance to the extent that it receives an excellent grade in the water boiling test, the heating coil (WC) must be able to operate continuously at the maximum output for about 9 to 11 minutes

[0584] Furthermore, in this embodiment, it is exemplified that the printed circuit board forming the heating coil assembly 1000 or the entire heating coil assembly 1000 is provided such that it is heat resistant at 150°C according to the North American RTI (Relative Thermal Index) standard.

[0585] Therefore, even if the heating coil (WC) operates continuously for more than 10 minutes, as long as the temperature of the heating coil (WC) can be maintained below 150°C, both the stability standards for printed circuit boards and the performance conditions for the water heating test will be met.

[0586] In other words, the cooking appliance of this embodiment can effectively satisfy the standards for the heating coil assembly 1000 and provide excellent heating performance by ensuring that the temperature of the heating coil (WC) is maintained at 150°C or below even when the heating coil (WC) is operated continuously for 10 minutes or more.

[0587] According to this embodiment, a single coil wire 1123,1124 is formed by a collection of multiple coil patterns (Cp) arranged along the diametrical direction, and this single coil wire 1123,1124 can be wound multiple times to form a single first coil section 1120, and these first coil sections 1120 can be connected in the vertical direction to form a heating coil (WC).

[0588] Furthermore, each coil wire 1123, 1124 forming the first coil section 1120 forms a lateral twist structure within the first coil section 1120, and the multiple coil wires 1123, 1124 stacked in the vertical direction form a vertical twist structure, thereby enabling the multiple coil patterns (Cp) forming the heating coil (WC) to form a twisted structure.

[0589] In other words, the heating coil (WC) may be formed as a result of multiple coil patterns (Cp) forming a lateral twisted structure and a vertical twisted structure, and being connected in the vertical direction. In this case, the total area of ​​the metal foil for each heating coil (WC) is not the sum of the areas of the metal foils forming the single coil sections 1120, 1220, but the sum of the areas of the metal foils of the multiple layers of coil sections 1120, 1220 that are connected in the vertical direction.

[0590] The current density (D) and the pattern cross-sectional area (S) per turn of the heating coil (WC) are inversely proportional. Therefore, in order to lower the current density (D), the pattern cross-sectional area (S) per turn of the heating coil (WC) must be large.

[0591] Taking these points into consideration, in this embodiment, a heating coil (WC) is formed as a result of connecting multiple coil wires 1123, 1124 stacked in the vertical direction in the vertical direction, and by forming a lateral twist structure and a vertical twist structure in these heating coils (WC), the pattern cross-sectional area (S) per turn of the heating coil (WC) can be increased.

[0592] The heating coil (WC) formed in this manner can increase the pattern cross-sectional area (S) per turn of the heating coil (WC) while minimizing the increase in the lateral size of the heating coil (WC). These heating coils (WC) effectively achieve the objective of reducing the current density (D) flowing through the heating coil (WC) while reducing its size.

[0593] By reducing the size of the heating coils (WC), the cooktop 100 of this embodiment may contain more heating coils (WC) than other cooktops of the same specifications. In other words, the cooktop 100 of this embodiment allows for a denser arrangement of smaller heating coils (WC) compared to conventional designs.

[0594] Furthermore, by reducing the current density (D) flowing through the heating coil (WC), the temperature rise of the heating coil (WC) can be suppressed more effectively. As a result, it becomes possible to maintain maximum output for a longer period of time compared to other cooktops of the same specifications.

[0595] In other words, the cooking appliance of this embodiment can not only provide improved heating efficiency by using small and densely arranged heating coils (WC), but can also provide higher output for a longer period of time.

[0596] Current density is 15 A / mm 2 ~20A / mm 2 As an example of how the pattern cross-sectional area (S) per turn of the heating coil (WC) can be set to fall within a certain range, the thickness (t) of the coil pattern (Cp) can be 0.08 mm to 0.12 mm, the width (w) of the coil pattern (Cp) can be 0.25 mm to 0.35 mm, and the spacing (d) between multiple coil patterns (Cp) can be set to 0.25 mm to 0.40 mm.

[0597] Current density is 15 A / mm 2 ~20A / mm 2 As another example of how the pattern cross-sectional area (S) per turn of the heating coil (WC) is set to fall within a certain range, the thickness (t) of the coil pattern (Cp) may be 0.085 mm to 0.110 mm, the width (w) of the coil pattern (Cp) may be 0.28 mm to 0.32 mm, and the spacing (d) between multiple coil patterns (Cp) may be set to 0.30 mm to 0.35 mm.

[0598] In this embodiment, it is illustrated that each coil pattern (Cp) is formed in a substantially rectangular shape. That is, the numerical values ​​related to the coil pattern (Cp) are values ​​set under the assumption that the coil pattern (Cp) is formed in a rectangular shape.

[0599] More specifically, the thickness (t) of the coil pattern (Cp) is 0.10 mm to 0.11 mm, the width (w) of the coil pattern (Cp) is 0.28 mm to 0.32 mm, and the spacing (d) between multiple coil patterns (Cp) may be set to 0.30 mm to 0.35 mm. Furthermore, the interlayer spacing of the coil patterns (Cp) may be set to 0.10 mm to 0.21 mm.

[0600] In this case, the heating coil assembly 1000 may include a total of 22 heating coils (WC), and the outer shape of each heating coil (WC) may be a rectangle with a length of 100 mm to 125 mm in the first direction and a length of 85 mm to 95 mm in the second direction. Each heating coil (WC) may include 10 or more layers of coil patterns (Cp), and each coil pattern (Cp) may be formed as a result of being wound 9 or more times around the first non-patterned region 1103. For example, each heating coil (WC) may include 10 layers of coil patterns (Cp), and each coil pattern (Cp) may be wound 9 to 11 times around the first non-patterned region 1103.

[0601] Furthermore, each heating coil (WC) may contain three or four coil patterns (Cp) per layer. For example, if each heating coil (WC) contains 10 layers of coil patterns (Cp), then either the top five layers or the bottom five layers of the heating coil (WC) may have four coil patterns (Cp), and the other one may have three coil patterns (Cp).

[0602] For example, the top five layers of a heating coil (WC) may have four coil patterns (Cp), and the bottom five layers of a heating coil (WC) may have three coil patterns (Cp). In this case, each heating coil (WC) may contain a total of 35 coil patterns (Cp).

[0603] In a heating coil (WC) of the form described above, the upper five layers of coil patterns (Cp) and the lower five layers of coil patterns (Cp) may be arranged so as not to overlap each other in the vertical direction. That is, the upper layer coil patterns (Cp) and the lower layer coil patterns (Cp) may be arranged alternately.

[0604] In this case, the electromagnetic generation locations in the upper layer coil pattern (Cp) and the lower layer coil pattern (Cp) can be arranged alternately along the lateral direction, thereby suppressing electromagnetic interference in the heating coil (WC).

[0605] As another example, the top five layers of a heating coil (WC) may contain three coil patterns (Cp), and the bottom five layers of the heating coil (WC) may contain four coil patterns (Cp). In this case as well, each heating coil (WC) may contain a total of 35 coil patterns (Cp).

[0606] As yet another example, as shown in Figure 60, four coil patterns (Cp) may be arranged in each layer of the heating coil (WC). In this case, each heating coil (WC) may contain a total of 40 coil patterns (Cp).

[0607] In other words, when four coil patterns (Cp) are arranged in each layer of the heating coil (WC), the total number of coil patterns (Cp) in the heating coil (WC) can be increased compared to when the number of coil patterns (Cp) differs from layer to layer. As the number of coil patterns (Cp) increases in this way, the pattern cross-sectional area per turn of the heating coil (WC) increases, which in turn helps to maintain the frequency of the current flowing through the heating coil (WC) at a low level, effectively suppressing the temperature rise of the heating coil (WC).

[0608] The coil modules 1001 and 1003 described above may be formed in a configuration in which four to six coil substrate sections 1100 and 1200 and a pair of outer layer sections 1300 and 1350 are stacked vertically. The vertical length, i.e., thickness, of these coil modules 1001 and 1003 may be set in the range of 3.2 mm to 3.8 mm.

[0609] For example, coil modules 1001 and 1003 may be formed in a configuration in which one first outer layer 1300, three first coil substrates 1100, one second coil substrate 1200, and one second outer layer 1350 are stacked vertically. That is, coil modules 1001 and 1003 may be formed in a configuration including 10 layers of coils 1120 and 1220. The thickness of these coil modules 1001 and 1003 may be set to 3.2 mm to 3.4 mm.

[0610] As described above, each coil substrate portion 1100, 1200 includes a core 1110, 1210 and a coil portion 1120, 1220, and multiple coil substrate portions 1100, 1200 may be joined together by an adhesive 1400.

[0611] In this case, the thickness of the adhesive 1400 may be set to be thicker than the thickness of the cores 1110 and 1210. Also, the thickness of the adhesive 1400 may be set to be thicker than the thickness of the coil sections 1120 and 1220. For example, the thickness of the adhesive 1400 may be set to more than twice the thickness of the coil sections 1120 and 1220.

[0612] On the other hand, while Figures 59 and 60 illustrate the vertical cross-sectional shape of the coil pattern (Cp) as a rectangle for convenience, the actual vertical cross-sectional shape of the coil pattern (Cp) may be a polygon with different lengths for the lower and upper bases, such as a trapezoid. Furthermore, it should be noted that in the vertical cross-section of the actual coil pattern (Cp), the sides may be formed as inclined straight lines or curves, rather than vertical lines.

[0613] As an example, as shown in Figures 56 and 61, the thickness of each core 1110 and 1210 may be 0.09 mm to 0.11 mm, the thickness of each coil section 1120 and 1220 may be 0.10 mm to 0.11 mm, and the thickness of each adhesive 1400 may be 0.28 mm to 0.36 mm.

[0614] At this time, the thickness of the adhesive 1400 is the thickness of the adhesive 1400 before it is interposed between the coil substrate portions 1100 and 1200. After the adhesive 1400 is interposed between the coil substrate portions 1100 and 1200 and joins them together, the thickness of the adhesive 1400 may decrease compared to before.

[0615] For example, the thickness of each core 1110, 1210 may be 0.10 mm to 0.11 mm, and the thickness of the adhesive 1400 interposed between the coil substrates 1100, 1200 may be 0.18 mm to 0.21 mm. In this case, the interlayer spacing of the core (coil pattern (Cp)) may be 0.10 mm to 0.21 mm.

[0616] As described above, the thickness of the coil modules 1001, 1003, which include 10 layers of coil sections 1120, 1220, may be set to 3.2 mm to 3.4 mm. As another example, the thickness of a coil module formed in which one first outer layer section 1300, four first coil substrate sections 1100, one second coil substrate section 1200, and one second outer layer section 1350 are stacked vertically, i.e., a coil module 1001, 1003, which includes 12 layers of coil sections 1120, 1220, may be set to a range of 3.6 mm to 3.8 mm.

[0617] In the coil modules 1001 and 1003 formed in this manner, the diameter (dm) of each via (V) connecting the coil sections 1120 and 1220 in the vertical direction may be set to 0.40 mm or more. In these vias (V), the lateral thickness (wt) of the inner wall (Vb) may be set to less than the thickness (t) of the coil pattern (Cp). That is, the inner wall (Vb) of each via (V) may be formed to be thinner than the thickness (t) of the coil pattern (Cp).

[0618] For example, each first vertical connection section 1030 may include a plurality of vias (V) arranged along the circumferential direction of the spiral formed by the heating coil (WC). The sum of the lateral thicknesses (wt) of the inner walls (Vb) of the vias (V) included in one first vertical connection section 1030 is set to be greater than half the thickness (t) of one coil pattern (Cp). For example, if each first vertical connection section 1030 is provided with two vias (V), the lateral thickness of the inner wall (Vb) of each via (V) may be set to be greater than one-quarter the thickness (t) of one coil pattern (Cp).

[0619] This allows a passage of sufficient width for current to flow to be formed in each of the first vertical connecting portions 1030. By forming a passage of sufficient width for current flow in the first vertical connecting portions 1030 in this way, the current flow in the heating coil (WC) is maintained stably, and the loss of current flowing through the heating coil (WC) can be effectively reduced.

[0620] In this embodiment, as shown in Figures 29 and 61, vias (V) are arranged in the separation region 1120b. For each via (V) arranged in this manner, the diameter of the land portion (Vc) may be set in the range of 0.75 mm to 0.85 mm. This is a result of a design that takes into account that the length of the separation region 1120b along the diametrical direction is set in the range of 1.05 mm to 1.15 mm. For example, the diameter of the land portion (Vc) may be set to a length that is shorter than the length of the separation region 1120b along the diametrical direction and that can be stably connected to the coil pattern (Cp).

[0621] In each vertical connection section 1030, the multiple vias (V) may be arranged along the circumferential direction. That is, in each vertical connection section 1030, the multiple vias (V) may not be arranged along the diametrical direction, but rather in a single line along the circumferential direction.

[0622] [Structure of the coil pattern] Figure 62 is a cross-sectional view showing the longitudinal cross-sectional shape of the pattern coil, Figure 63 is an enlarged view showing the pattern coil shown in Figure 62, and Figure 64 is a table comparing a pattern coil according to one embodiment of the present invention with a comparative example. Furthermore, Figure 65 is an enlarged cross-sectional view showing the longitudinal cross-sectional shape of the pattern coil formed by etching, and Figure 66 is a cross-sectional view showing another example of a pattern coil formed by etching.

[0623] As shown in Figures 50 and 62 to 64, the heating coil (WC) is formed by a plurality of first coil sections 1120 stacked in the vertical direction, and the first coil sections 1120 may include a plurality of coil patterns (Cp) arranged along the diametrical direction of the heating coil (WC).

[0624] For example, each coil pattern (Cp) may be formed in a coil-like pattern on the core 1110 of the first coil substrate portion 1100.

[0625] As described above, the coil pattern (Cp) may be formed through a process that proceeds in the order of dry film application - exposure - development - etching. That is, the coil pattern (Cp) may be formed as a result of the corrosion of the unhardened portion of the foil laminated on the core 1110 and removed from the coil substrate portions 1100 and 1200.

[0626] The longitudinal cross-section of each coil pattern (Cp) may be formed in a polygonal shape, including a lower base (Ca) closest to the core 1110 and an upper base (Cb) separated from the core 1110 by the thickness of the coil pattern (Cp). In the coil pattern (Cp), the length of the upper base (Cb) may be set to be less than the length of the lower base (Ca).

[0627] Typically, during the process of forming the coil pattern (Cp) as described above, a larger amount of foil is removed in the region adjacent to the upper base (Cb) compared to the lower base (Ca). In other words, as a result of the etching process, the formation of the coil pattern (Cp) results in a large amount of foil loss in the region adjacent to the upper base (Cb).

[0628] For example, in the process of removing a portion of the foil to form a coil pattern (Cp), more foil is removed around the upper base (Cb) than around the lower base (Ca). As a result, the length of the upper base (Cb) becomes shorter than the design value, and the length of the upper base (Cb) becomes shorter than the length of the lower base (Ca).

[0629] For example, the vertical cross-section of the coil pattern (Cp) may be formed as a polygon where the length of the upper base (Cb) is 70% to 80% of the length of the lower base (Ca). In this embodiment, it is exemplified that the vertical cross-section of the coil pattern (Cp) is formed as a polygon close to a trapezoid with the lower base (Ca) and upper base (Cb) being parallel.

[0630] For example, the longitudinal cross-section of each coil pattern (Cp) may be formed as a polygon including a pair of sides (Cca, Ccb) that connect the lower base (Ca) and the upper base (Cb) in the vertical direction. Each side (Cca, Ccb) may include a first side (Cca) connected to the upper base (Cb) and a second side (Ccb) connecting the first side (Cca) and the lower base (Ca). That is, the second side (Ccb) is positioned above the lower base (Ca), and the first side (Cca) is positioned above the second side (Ccb).

[0631] For example, the first side (Cca) may be formed as a straight line in the vertical direction. For instance, the first side (Cca) may be formed as a vertical line. The second side (Ccb) may be formed as an inclined surface connecting the lower end of the first side (Cca) and the lower base (Ca).

[0632] The second side (Ccb) may be formed as an inclined surface that slopes outward in the lateral direction of the coil pattern (Cp) as it approaches the lower base (Ca) in the vertical direction, i.e., as it moves downward. For example, the second side (Ccb) may be formed as a curved shape connecting the lower end of the first side (Cca) and the lower base (Ca). In this case, the second side (Ccb) may be formed as a concave curved shape toward the lateral inward and downward sides of the coil pattern (Cp).

[0633] As an example, the longitudinal cross-section of a coil pattern (Cp) can satisfy the following relationship.

[0634] 1.47 ≤ W1 / t ≤ 1.57

[0635] (However, W1 is the length of the bottom of the coil pattern, and t is the thickness of the coil pattern.)

[0636] According to this embodiment, the length (W1) of the lower base (Ca) of the coil pattern (Cp) is set to a range of 1.47 to 1.57 times the thickness of the coil pattern (Cp). By satisfying these conditions, the coil pattern (Cp) is formed in such a way that even if the length of the upper base (Cb) becomes 20% or more shorter than the length of the lower base (Ca) during the coil pattern (Cp) formation process, the cross-sectional area of ​​each coil pattern (Cp) will be 90% or more of the design value.

[0637] For example, the width (W) of the coil pattern (Cp) may be set in the range of 0.3 mm to 0.6 mm. More specifically, the width (W) of the coil pattern (Cp) may be set in the range of 0.5 mm to 0.6 mm.

[0638] Referring to Figures 62 to 55, each unit of a heating coil (WC) with a length of 104 mm in the first direction and a length of 96 mm in the second direction contains 10 layers of first coil sections 1120, and under the condition that the thickness of each coil pattern (Cp) is 0.105 mm, if the width of each coil pattern (Cp) and the spacing between coil patterns (Cp) are both 0.30 mm, then the pattern cross-sectional area (S) per turn of the heating coil (WC) is approximately 0.945 mm². 2 This is possible (comparative example). In other words, if the design values ​​in the comparative example are correct, the pattern cross-sectional area (S) per turn of the heating coil (WC) will be approximately 0.945 mm². 2 This could be the case.

[0639] In this case, each unit of the heating coil (WC) may contain a coil pattern (Cp) of 3 columns x 10 rows. That is, the number of patterns per turn of the heating coil (WC) is approximately 30.

[0640] In the comparative example designed in the manner described above, the actual heating coil (WC) may be formed in a trapezoidal shape, and the pattern cross-sectional area (S) per turn of such a trapezoidally formed heating coil (WC) is approximately 0.827 mm². 2 This is possible. In other words, the actual pattern cross-sectional area (S) per turn of a trapezoidally formed heating coil (WC) is only about 87.5% of the design value.

[0641] In contrast, under the same conditions as the heating coil (WC) in the comparative example, that is, each unit of the heating coil (WC) having a length of 104 mm in the first direction and a length of 96 mm in the second direction, contains 10 layers of first coil section 1120, and the thickness of each coil pattern (Cp) is 0.105 mm, if the width of each coil pattern (Cp) and the spacing between coil patterns (Cp) are both 0.53 mm, then each unit of the heating coil (WC) may contain 2 columns * 10 rows of coil patterns (Cp). In other words, the number of patterns per turn of the heating coil (WC) is approximately 20.

[0642] In these embodiments, the pattern cross-sectional area (S) per turn of the heating coil (WC) is approximately 1.113 mm². 2 This is possible. In other words, if the design values ​​in the embodiment are correct, the pattern cross-sectional area (S) per turn of the heating coil (WC) will be approximately 1.113 mm². 2 This could be the case.

[0643] In the embodiment designed in the manner described above, the actual heating coil (WC) may be formed in a trapezoidal shape, and the pattern cross-sectional area (S) per turn of such a trapezoidally formed heating coil (WC) is approximately 1.030 mm². 2 This can result in the actual pattern cross-sectional area (S) per turn of the trapezoidally formed heating coil (WC) reaching approximately 92.5% of the design value.

[0644] In other words, according to this embodiment, even though the number of patterns per turn of the heating coil (WC) decreases compared to the comparative example, the pattern cross-sectional area (S) per turn of the heating coil (WC) increases compared to the comparative example.

[0645] Furthermore, it is natural that the pattern cross-sectional area (S) per turn of the heating coil (WC) according to the design values ​​of this embodiment, that is, the rectangular heating coil (WC) of this embodiment, is larger than the pattern cross-sectional area (S) per turn of the heating coil (WC) according to the design values ​​of the comparative example, that is, the rectangular heating coil (WC) of the comparative example. In fact, the pattern cross-sectional area (S) per turn of the actual heating coil (WC) of this embodiment, that is, the pattern cross-sectional area (S) per turn of the trapezoidal heating coil (WC) of this embodiment, may be larger than the pattern cross-sectional area (S) per turn of the rectangular heating coil (WC) of the comparative example.

[0646] In other words, the heating coil (WC) of this embodiment is formed such that the length (W1) of the lower base (Ca) of the coil pattern (Cp) is set to a range of 1.47 to 1.57 times the thickness of the coil pattern (Cp). This allows the heating coil (WC) to be formed such that even if the length of the upper base (Cb) becomes 20% or more shorter than the length of the lower base (Ca) during the coil pattern (Cp) formation process, it has a sufficient pattern cross-sectional area (S) per turn necessary to effectively suppress the temperature rise of the heating coil (WC).

[0647] The coil pattern (Cp) formed as described above may be connected to vias (V) as shown in Figures 29 and 61-63. For example, the diameter (dm) of the via (V) connected to the coil pattern (Cp) may be set to be longer than the length of the bottom base (Ca) of the coil pattern (Cp). By setting the diameter (dm) of the via (V) to be longer than the length of the bottom base (Ca) of the coil pattern (Cp), the connection between the via (V) and the coil pattern (Cp) becomes more reliable.

[0648] For example, in the manufacturing process of a heating coil assembly, even if positional deviations occur in the coil pattern (Cp) for each layer, if the diameter (dm) of the via (V) is longer than the width of the coil pattern (Cp), the likelihood of proper connection between the via (V) and the coil pattern (Cp) increases.

[0649] Furthermore, considering that the length of the lower base (Ca) is likely to be longer than the length of the upper base (Cb) in the coil pattern (Cp), if the diameter (dm) of the via (V) is set to be longer than the length of the lower base (Ca), the connection between the via (V) and the coil pattern (Cp) will be reliably maintained even if positional deviations of the coil pattern (Cp) occur in each layer during the manufacturing process of the heating coil assembly.

[0650] As another example, the diameter of a dummy via (DV; see Figure 21), which is provided so as not to be connected to the coil pattern (Cp), may also be set to be longer than the length of the bottom base (Ca) of the coil pattern (Cp), similar to the case of a via (V).

[0651] As yet another example, the inner diameter of the via (V) may be set shorter than the length of the lower base (Ca). More preferably, the inner diameter of the via (V) may be set shorter than the length of the upper base (Cb). In this case, the lateral length of the region occupied by the hole (Va) inside the via (V) decreases, while the lateral length of the region occupied by the inner wall (Vb) may increase.

[0652] As described above, when the inner diameter of the via (V) is set to be shorter than the length of the lower base (Ca) or upper base (Cb), the connection between the via (V) and the coil pattern (Cp) is not only made more reliable, but the contact area between the via (V) and the coil pattern (Cp) is expanded, thereby reducing the resistance at the connection point between the via (V) and the coil pattern (Cp).

[0653] On the other hand, the coil pattern (Cp) may include a first coil pattern (CP1) and a second coil pattern (CP2). The first coil pattern (CP1) may be formed in a polygonal shape with the lower base (Ca) positioned on the bottom and the upper base (Cb) positioned on the top. The second coil pattern (CP2) may be formed in a polygonal shape with the lower base (Ca) positioned on the top and the upper base (Cb) positioned on the bottom.

[0654] For example, the first coil pattern (CP1) and the second coil pattern (CP2) may be arranged symmetrically with respect to a horizontal line. For instance, the first coil pattern (CP1) and the second coil pattern (CP2) may each be formed in a trapezoidal shape, but in a shape that is symmetrical with respect to the core 1110.

[0655] In this case, the first coil pattern (CP1) and the second coil pattern (CP2) may be provided in a form that does not have perfect line symmetry, but includes a portion of the line-symmetric region. That is, depending on the position of the vias (V) and the characteristics of the pattern shape, a portion of the first coil pattern (CP1) or the second coil pattern (CP2) may not have to be symmetric, and the first coil pattern (CP1) and the second coil pattern (CP2) may be provided in a form in which the remaining region is line-symmetric.

[0656] When the coil pattern (Cp) is formed in a patterned form on the core 1110 of the first coil substrate portion 1100, the first coil pattern (CP1) may be positioned on the upper side of the core 1110, and the second coil pattern (CP2) may be positioned on the lower side of the core 1110.

[0657] According to this embodiment, a heating coil (WC) can be formed by connecting a first coil pattern (CP1) and a second coil pattern (CP2) stacked in the vertical direction. In this case, the coil modules 1001 and 1003 may include regions in which the first coil pattern (CP1) and the second coil pattern (CP2) are arranged alternately in the vertical direction.

[0658] For example, multiple first coil substrates 1100 may be stacked vertically, and a first coil pattern (CP1) and a second coil pattern (CP2) may be deposited on both the vertical sides of each first coil substrate 1100, thereby arranging the first coil pattern (CP1) and the second coil pattern (CP2) alternately in the vertical direction.

[0659] When the coil pattern (Cp) is formed in a patterned form on the core 1110 of the first coil substrate portion 1100, the lower base (Ca) may be in contact with the core 1110, and the upper base (Cb) may be separated from the core 1110 in the vertical direction by the thickness of the coil pattern (Cp).

[0660] On the other hand, as mentioned above, the coil pattern (Cp) is formed by etching, in which case at least a portion of the coil pattern (Cp) can form an uneven surface. In the previously illustrated drawing, the coil pattern (Cp) was shown to consist only of smooth surfaces, but in reality, the coil pattern (Cp) formed by methods such as etching may be formed to have an uneven surface.

[0661] For example, in the coil pattern (Cp) of this embodiment, as shown in Figure 65, either the lower base (Ca) or the upper base (Cb) can form a flat surface, while the other of the lower base (Ca) or upper base (Cb) can form an uneven surface.

[0662] For example, the lower base (Ca) can form a flat surface, while the upper base (Cb) can form an uneven surface. The coil pattern (Cp) is formed as a result of the etching process, with the upper base (Cb) forming an uneven surface and the lower base (Ca) in contact with the core 1110 forming a flat surface.

[0663] When the coil pattern (Cp) is formed in a manner that is patterned on both the upper and lower sides of the core 1110 of the first coil substrate portion 1100, the upper surface of the first coil pattern (CP1) located on the upper side of the core 1110 will form an uneven surface, and the lower surface of the second coil pattern (CP2) located on the lower side of the core 1110 will form an uneven surface.

[0664] As another example, as shown in Figure 66, the coil pattern (Cp) may be formed only on the cross-section of the first coil substrate portion 1110, or the coil pattern (Cp) may be printed on the upper surface of each insulating layer. When the coil pattern (Cp) is printed on the upper surface of each insulating layer, the insulating layers and the coil patterns (Cp) printed thereon may be sequentially stacked from the bottom layer.

[0665] In this case, in each coil pattern (Cp), the upper base (Cb) may be positioned above the lower base (Ca). That is, in every coil pattern (Cp), the upper base (Cb) will point in one direction, for example, upward. In other words, in every coil pattern (Cp) shown in Figure 66, the flat lower base (Ca) may be positioned downwards, and the uneven upper base (Cb) may be positioned upwards.

[0666] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely illustrative, and a person with ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true scope of technical protection of the present invention should be defined by the following claims.

[0667] For example, this specification describes an embodiment in which a heating coil assembly is used in a cooking appliance. However, in other embodiments, the heating coil assembly may be applied to other household appliances that require induction heating.

[0668] For example, a heating coil assembly may be attached to a washing machine and used to heat the water tank, drum, or washing tub inside the washing machine, or to heat the wash water.

[0669] As another example, the heating coil assembly may be attached to a water purifier and used to heat hot water pipes or tanks.

[0670] As yet another example, the heating coil assembly may be attached to a clothes dryer or garment care machine and used to heat the air for drying clothes.

[0671] As yet another example, the heating coil assembly may be attached to an electric kettle or rice cooker and used to heat the liquid or food inside the appliance.

[0672] [Claims when filing an international application] [Claim 1] Home appliances, It comprises at least one coil module equipped with a heating coil for induction heating of an object to be heated, The heating coil is formed by a plurality of coil patterns stacked in the vertical direction. The vertical cross-section of each coil pattern is formed to have a shape comprising a lower base and an upper base separated vertically by the thickness of the coil pattern. A home appliance in which the length of the upper base is less than the length of the lower base. [Claim 2] The home appliance according to claim 1, wherein the vertical cross-section of the coil pattern is formed in a shape in which the length of the upper base is 70% to 80% of the length of the lower base. [Claim 3] The home appliance according to claim 1, wherein the vertical cross-section of the coil pattern is formed in a trapezoidal shape with the lower base and the upper base parallel. [Claim 4] The vertical cross-section of the coil pattern is formed to have a shape that includes a pair of side edges connecting the lower base and the upper base in the vertical direction. Each of the aforementioned sides comprises a first side connected to the upper base and a second side connecting the first side and the lower side. The home appliance according to claim 1, wherein the second side surface forms an inclined surface that moves away from the lateral center of the lower base as it approaches the lower base. [Claim 5] The first side is formed in a straight line in the vertical direction, The home appliance according to claim 4, wherein the second side is formed by an inclined surface connecting the lower end of the first side and the lower base. [Claim 6] The home appliance according to claim 1, wherein the coil pattern is formed on the coil module as a result of the removal of portions of the foil laminated on the core that have not been hardened by exposure, due to corrosion. [Claim 7] The home appliance according to claim 1, wherein the longitudinal cross-section of the coil pattern satisfies the following relationship. 0.47 ≤ W1 / t ≤ 0.57 [In the above relationship, W1 is the length of the bottom of the coil pattern. t is the thickness of the coil pattern. [Claim 8] The lateral outer shape of the heating coil is, The length in the first direction is 98mm to 100mm. The rectangle has a length of 118 mm to 120 mm in the second direction perpendicular to the first direction. The coil module comprises a plurality of coil patterns arranged along the diametrical direction of the helix formed by the heating coil, The home appliance according to claim 1, wherein the width of each of the aforementioned coil patterns is 0.3 mm to 0.6 mm. [Claim 9] The coil module comprises a pair of coil patterns arranged along the diametrical direction of the helix formed by the heating coil, The thickness of each of the aforementioned coil patterns is 0.10 mm to 0.11 mm. The home appliance according to claim 8, wherein the width of each of the aforementioned coil patterns is 0.5 mm to 0.6 mm. [Claim 10] Either the lower edge or the upper base forms a flat surface. The home appliance according to claim 1, wherein the other of the lower edge and the upper base forms an uneven surface. [Claim 11] The coil module is formed by a plurality of coil substrates stacked in the vertical direction, The home appliance according to claim 1, wherein each of the coil substrate portions comprises at least one of the coil patterns patterned on the core. [Claim 12] The lower base is in contact with the core, The home appliance according to claim 11, wherein the upper base is separated from the core in the vertical direction by the thickness of the coil pattern. [Claim 13] The home appliance according to claim 11, wherein the coil pattern is deposited on the upper and lower surfaces of the core, respectively. [Claim 14] The aforementioned coil pattern is The lower bottom is deposited onto the insulating layer so that it is in contact with the insulating layer. The lower base forms a flat surface, The home appliance according to claim 1, wherein the upper base forms an uneven surface. [Claim 15] The aforementioned coil pattern is A first coil pattern in which the bottom base is positioned on the lower side and the top base is positioned on the upper side, It comprises a second coil pattern in which the lower base is positioned on the upper side and the upper base is positioned on the lower side, The home appliance according to claim 1, wherein the coil module comprises a region in which the first coil pattern and the second coil pattern are arranged alternately in the vertical direction. [Claim 16] The aforementioned coil pattern is A first coil pattern is positioned above the insulating layer, The system comprises a second coil pattern disposed below the insulating layer, The home appliance according to claim 1, wherein the first coil pattern and the second coil pattern are arranged symmetrically with respect to a horizontal straight line. [Claim 17] The coil module further comprises vias connected to the coil pattern, The home appliance according to claim 1, wherein the diameter of the via is longer than the length of the bottom base. [Claim 18] The coil module further comprises vias connected to the coil pattern, or dummy vias not connected to the coil pattern. The home appliance according to claim 1, wherein the diameter of the via or the dummy via is longer than the length of the bottom base. [Claim 19] The coil module further comprises vias connected to the coil pattern, The home appliance according to claim 1, wherein the inner diameter of the via is shorter than the length of the bottom base. [Explanation of symbols]

[0673] 10 Oven section 11 doors 13 Main Control Panel 100 Cooktop 105 Control Unit 110 cases 111 Bottom 113 Side wall section 115 Support protrusion 120 Top Plate 130 Cooktop Control Panel 150 Supporters 160 ferrite core 171 Main PCB 172 Switching Mode Power Supply 173 Inverter PCB 174 Resonant PCB 175 Noise Filter 176 Fans 180 lighting modules 1000 Heating coil assembly 1001 First Coil Module 1003 Second Coil Module 1010 Coil substrate laminate 1020 Terminal section 1021 1st terminal 1023 2nd terminal 1025 3rd terminal 1030 First vertical connection section 1040 Second vertical connection section 1100 First coil substrate section 1101 Pattern Area 1103 First non-pattern region 1105 Second non-pattern region 1110 cores 1120 First coil section 1120a Segmented area 1120b Separate area 1121 Terminal 1 1122 Terminal 2 1123 First coil wire 1124 Second coil wire 1200 Second coil substrate section 1210 cores 1220 Second coil section 1300 1st outer layer 1350 2nd outer layer 1400 Adhesive

Claims

1. It is a home appliance, It comprises at least one coil module equipped with a heating coil for induction heating of an object to be heated, The heating coil is formed by a plurality of coil patterns stacked in the vertical direction. The vertical cross-section of each coil pattern is formed to have a shape comprising a lower base and an upper base separated vertically by the thickness of the coil pattern. A home appliance in which the length of the upper base is less than the length of the lower base.

2. The home appliance according to claim 1, wherein the vertical cross-section of the coil pattern is formed in a shape in which the length of the upper base is 70% to 80% of the length of the lower base.

3. The home appliance according to claim 1, wherein the vertical cross-section of the coil pattern is formed in a trapezoidal shape with the lower base and the upper base parallel.

4. The vertical cross-section of the coil pattern is formed to have a shape that includes a pair of side edges connecting the lower base and the upper base in the vertical direction. Each of the aforementioned sides comprises a first side connected to the upper base and a second side connecting the first side and the lower side. The home appliance according to claim 1, wherein the second side surface forms an inclined surface that moves away from the lateral center of the lower base as it approaches the lower base.

5. The first side is formed in a straight line in the vertical direction, The home appliance according to claim 4, wherein the second side is formed by an inclined surface connecting the lower end of the first side and the lower base.

6. The home appliance according to claim 1, wherein the coil pattern is formed on the coil module as a result of the removal of portions of the foil laminated on the core that have not been hardened by exposure, due to corrosion.

7. The home appliance according to claim 1, wherein the longitudinal cross-section of the coil pattern satisfies the following relationship. 0.47 ≤ W1 / t ≤ 0.57 [In the above relationship, W1 is the length of the bottom of the coil pattern. t is the thickness of the coil pattern.

8. The lateral outer shape of the heating coil is, The length in the first direction is 98 mm to 100 mm. The rectangle has a length of 118 mm to 120 mm in the second direction perpendicular to the first direction. The coil module comprises a plurality of coil patterns arranged along the diametrical direction of the helix formed by the heating coil, The home appliance according to claim 1, wherein the width of each of the coil patterns is 0.3 mm to 0.6 mm.

9. The coil module comprises a pair of coil patterns arranged along the diametrical direction of the helix formed by the heating coil, The thickness of each of the aforementioned coil patterns is 0.10 mm to 0.11 mm. The home appliance according to claim 8, wherein the width of each of the aforementioned coil patterns is 0.5 mm to 0.6 mm.

10. Either the lower edge or the upper base forms a flat surface. The home appliance according to claim 1, wherein the other of the lower edge and the upper base forms an uneven surface.

11. The coil module is formed by a plurality of coil substrates stacked in the vertical direction, The home appliance according to claim 1, wherein each of the coil substrate portions comprises at least one of the coil patterns patterned on the core.

12. The lower base is in contact with the core, The home appliance according to claim 11, wherein the upper base is separated from the core in the vertical direction by the thickness of the coil pattern.

13. The home appliance according to claim 11, wherein the coil pattern is deposited on the upper and lower surfaces of the core, respectively.

14. The aforementioned coil pattern is The lower bottom is deposited onto the insulating layer so that it is in contact with the insulating layer. The lower base forms a flat surface, The home appliance according to claim 1, wherein the upper base forms an uneven surface.

15. The aforementioned coil pattern is A first coil pattern in which the bottom base is positioned on the lower side and the top base is positioned on the upper side, A second coil pattern is provided, in which the lower base is positioned on the upper side and the upper base is positioned on the lower side, The home appliance according to claim 1, wherein the coil module comprises a region in which the first coil pattern and the second coil pattern are arranged alternately in the vertical direction.

16. The aforementioned coil pattern is A first coil pattern is positioned above the insulating layer, The system comprises a second coil pattern disposed below the insulating layer, The home appliance according to claim 1, wherein the first coil pattern and the second coil pattern are arranged symmetrically with respect to a horizontal straight line.

17. The coil module further comprises vias connected to the coil pattern, The home appliance according to claim 1, wherein the diameter of the via is longer than the length of the bottom base.

18. The coil module further comprises vias connected to the coil pattern, or dummy vias not connected to the coil pattern. The home appliance according to claim 1, wherein the diameter of the via or the dummy via is longer than the length of the bottom base.

19. The coil module further comprises vias connected to the coil pattern, The home appliance according to claim 1, wherein the inner diameter of the via is shorter than the length of the bottom base.

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