JP7138457B2 - induction cooker - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker equipped with a sensor for detecting the state of an object to be heated such as a cooking container.

Conventionally, an induction heating cooker is known that is equipped with a sensor that detects the presence or absence of a cooking container placed on a top plate, the temperature of the cooking container, and the like. For example, known methods for detecting the temperature of a cooking vessel include a thermistor method using a thermistor, which is a contact temperature sensor, and an infrared sensor method using an infrared sensor, which is a non-contact temperature sensor. . In the thermistor method, a thermistor is brought into contact with the top plate to detect the temperature transmitted from the cooking vessel through the top plate. In the infrared sensor method, an infrared sensor placed below the heating coil detects the infrared radiant energy emitted from the cooking vessel placed on the top plate, and the temperature of the cooking vessel is calculated from the amount of infrared energy detected. .

In addition, the induction heating cooker generates an eddy current in the cooking vessel body placed above the heating coil by magnetic flux generated by passing an electric current through a heating coil arranged in the heating cooker. The Joule heat generated by the resistance of the main body heats the cooking container. Therefore, when an infrared sensor is used to detect the state of an induction cooker, part of the magnetic flux generated by the heating coil enters the sensor, and electromagnetic noise is superimposed on the output of the sensor, resulting in stable output. no longer. In order to solve such problems, it has been proposed to provide magnetic shielding means around the sensor.

For example, in Patent Document 1, by providing a metal waveguide that guides infrared rays to an infrared sensor and magnetic shielding means arranged on the upper part of a printed wiring board on which the infrared sensor is mounted, leakage from the heating coil It has been proposed to reduce electromagnetic noise due to magnetic flux.

Further, in Patent Document 2, a magnetic shield disposed below a heating coil, a casing made of a conductive material that accommodates an infrared sensor, and a magnetic shield interposed between the lower surface of the magnetic shield and the upper end of the casing for electrical insulation. It has been proposed to reduce electromagnetic noise due to leakage magnetic flux from the heating coil by providing a spacer having flexibility.

JP-A-2005-122962 WO2015/025523

Here, in recent years, along with the diversification of kitchen types, the types of induction cookers are also diversifying. For example, there are various induction cookers such as those with a storage section instead of the grill section of the induction cooker, those that incorporate the induction cooker into the dining table, and those that allow the induction cooker to be operated from the other side. is proposed. Thus, in order to utilize the periphery of the induction heating cooker, particularly the lower portion of the induction heating cooker for various purposes, it is desirable to reduce the thickness of the main body of the induction heating cooker.

However, in the prior art described in Patent Documents 1 and 2, magnetic shielding means or a casing having a magnetic shielding effect is provided below the support base of the heating coil in order to reduce the magnetic flux leaking downward from the heating coil. Therefore, it is difficult to realize a thin induction heating cooker.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object of the present invention is to provide an induction heating cooker that can reduce the leakage magnetic flux downward from the heating coil and can achieve a reduced thickness.

An induction heating cooker according to the present invention comprises a top plate on which a cooking container is placed, a heating coil arranged below the top plate to heat the cooking container, and a heating coil arranged below the heating coil to hold the heating coil. holding means, ferrite disposed between the heating coil and the holding means, and a sensor for detecting the state of the cooking container, the holding means having an opening, and the sensor being located in the opening when viewed from above. At least part of the periphery of the opening is provided with a magnetic shielding rib that at least partially faces the side surface of the heating coil, and the top surface of the magnetic shielding rib is located above the bottom surface of the heating coil .

According to the induction heating cooker of the present invention, by providing the holding means with magnetic shielding ribs for reducing the magnetic flux that enters below the heating coil from the opening, it becomes possible to bring the sensor closer to the top plate. The distance from the lower surface to the sensor can be shortened, and the thickness of the induction heating cooker can be reduced.

1 is a schematic perspective view of an induction heating cooker according to Embodiment 1. FIG. 1 is a schematic configuration diagram of main parts of an induction heating cooker according to Embodiment 1. FIG. 4 is a top view of the heating coil unit of Embodiment 1. FIG. 2 is an exploded perspective view of the heating coil unit of Embodiment 1. FIG. FIG. 4 is an end view of a cut portion of the heating coil unit taken along line AA of FIG. 3; 4A and 4B are diagrams illustrating a method of forming ribs in the holding means of the first embodiment; FIG. 4 is a perspective view showing the direction of the magnetic field of the heating coil in Embodiment 1. FIG. FIG. 10 is a top view of a heating coil unit in modification 1-1; FIG. 11 is a perspective view of a holding means in modification 1-1; FIG. 11 is a perspective view of a heating coil unit in modification 1-2; FIG. 11 is a perspective view of a holding means in modification 1-2; FIG. 11 is a top view of a heating coil unit in modification 1-3; FIG. 11 is a perspective view of a heating coil unit in modification 1-3; FIG. 11 is an end view of a heating coil unit in modification 1-4; FIG. 11 is an end view of a heating coil unit in modification 1-5; FIG. 11 is a perspective view of a heating coil unit in modification 1-6; FIG. 8 is an exploded perspective view of a heating coil unit according to Embodiment 2; FIG. 11 is an end view of the heating coil unit according to Embodiment 2; FIG. 11 is an end view of a heating coil unit in modification 2-1; FIG. 11 is an end view of a heating coil unit according to Embodiment 3; FIG. 11 is a perspective view of an insulating means according to Embodiment 3; FIG. 11 is an end view of a heating coil unit in modification 3-1; FIG. 11 is a perspective view of a heating coil unit according to Embodiment 4; FIG. 11 is a perspective view of a holding means in Embodiment 4; FIG. 11 is a schematic configuration diagram of the main part of an induction heating cooker according to Embodiment 5; FIG. 11 is a schematic configuration diagram of a main part of an induction heating cooker in modified example 5-1;

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which an induction heating cooker according to the present invention is applied to a household IH (Induction Heating) cooker will be described below with reference to the drawings. Moreover, the induction heating cooker shown in the drawings is an example of the induction heating cooker of the present invention, and the applicable equipment of the present invention is not limited to the induction heating cooker shown in the drawings. Also, in the following description, terms representing directions (for example, "up", "down", "right", "left", "front", "back", etc.) are used as appropriate for ease of understanding. They are for illustrative purposes and are not intended to limit the invention. Also, in each figure, the same reference numerals denote the same or corresponding structures, which are common throughout the specification. In each drawing, the relative dimensional relationship, shape, etc. of each component may differ from the actual one.

Embodiment 1.
(Configuration of induction heating cooker)
FIG. 1 is a schematic perspective view of an induction heating cooker 100 according to Embodiment 1. FIG. As shown in FIG. 1 , the induction heating cooker 100 includes a main body 1 and a top plate 2 arranged on the upper surface of the main body 1 . A front operation section 3 is provided on the front surface of the main body 1 . The front operation unit 3 includes a power switch for turning ON/OFF the power of the induction heating cooker 100 and a plurality of operation dials for adjusting the heating power.

The top plate 2 is composed of, for example, a heat-resistant glass plate and a metal frame attached around the glass plate. A heating port 4, which is a heating area, is provided on the upper surface of the top plate 2. As shown in FIG. As shown in FIG. 1, three heating ports 4 are provided in this embodiment. A heating port 4 indicates an area on which a cooking container such as a pot or frying pan is placed. A heating coil 5 as a heating source is provided inside the main body 1 below the heating port 4 . The heating port 4 is formed in the same shape as the heating coil 5 as a heating source, or in a shape slightly larger than the heating coil 5 . In this embodiment, the heating port 4 is formed in a circular shape when viewed from above. A transmission window 40 is provided in the heating port 4 of the top plate 2 . The transmission window 40 is provided for detecting infrared rays of the cooking vessel 300 passing through the top plate 2 by the non-contact temperature sensor 20 (FIG. 2). The number and shape of the heating ports 4 and the heating coils 5 are not limited to the example shown in FIG.

An operation display unit 6 is provided on the front side of the top plate 2 . The operation display unit 6 of the present embodiment includes, for example, a display screen having a plurality of light emitting diodes (LEDs) and a capacitive touch sensor. The touch sensor receives, via the top plate 2, user's operation inputs such as heating power, temperature, and cooking mode of the heating coil 5 corresponding to each heating port 4. FIG. The display screen displays a heating power display indicating the magnitude of the heating power set by the front operation unit 3 or the touch sensor, information about the setting state and operating state of the induction heating cooker 100, or the like. Here, the information about the operating state of the induction heating cooker 100 includes the selected cooking mode, the progress of automatic cooking, the temperature of the cooking container placed on the heating port 4, and the display of warning information.

FIG. 2 is a schematic configuration diagram of main parts of the induction heating cooker 100 according to the present embodiment. FIG. 2 shows both a schematic end view and a functional configuration of the induction heating cooker 100 together with the cooking vessel 300 placed on the top plate 2 . Although only one heating coil 5 is illustrated in FIG. 2, the structure related to the other heating coils 5 is the same as in FIG. As shown in FIG. 2, inside the main body 1 of the induction heating cooker 100 and below the top plate 2 are a heating coil unit 50, a non-contact temperature sensor 20, a contact temperature sensor 30, and a temperature sensor. A detection unit 11, a control unit 12, and an inverter 13 are provided.

The heating coil unit 50 consists of the heating coil 5 , ferrite 51 , insulating means 52 and holding means 53 . Moreover, the heating coil 5 of this Embodiment consists of the 1st coil 5a and the 2nd coil 5b concentrically. Details of the heating coil unit 50 will be described later.

The non-contact temperature sensor 20 is an infrared temperature sensor configured by a photodiode, thermopile, or the like that detects infrared energy emitted from the bottom of the cooking vessel 300 placed on the heating coil 5 . The non-contact temperature sensor 20 is arranged below the transmissive window 40 of the top plate 2 and between the first coil 5a and the second coil 5b. The non-contact temperature sensor 20 is housed in a sensor case 21 made of resin so that the cooling air flowing near the heating coil 5 does not hit the non-contact temperature sensor 20 directly. In addition, the non-contact temperature sensor 20 is held in the sensor case 21 while maintaining a spatial distance so that the ambient temperature around the non-contact temperature sensor 20 is uniform. The sensor case 21 is fixed to the holding means 53 of the heating coil unit 50 by tapping screws or the like, and the distance between the top plate 2 and the non-contact temperature sensor 20 is kept constant.

Contact temperature sensor 30 is, for example, a thermocouple or a thermistor. The contact temperature sensor 30 is arranged in contact with the back surface of the top plate 2 , that is, the surface facing the heating coil 5 . Contact temperature sensor 30 detects the temperature of cooking vessel 300 placed on top plate 2 via top plate 2 . The contact temperature sensor 30 is arranged between the first coil 5a and the second coil 5b, and is fixed to the holding means 53 of the heating coil unit 50 with a tapping screw or the like.

The temperature detection unit 11 is composed of hardware such as a circuit device that realizes its function, or an arithmetic device such as a microcomputer and software executed thereon. Temperature detector 11 receives the output values of non-contact temperature sensor 20 and contact temperature sensor 30, and determines the temperature of cooking vessel 300 based on the received output values. The temperature obtained by the temperature detector 11 is transmitted to the controller 12 .

The control unit 12 is composed of hardware such as a circuit device that realizes its functions, or an arithmetic unit such as a microcomputer and software executed thereon. The control unit 12 controls the operation of the induction heating cooker 100 based on the settings input to the front operation unit 3 or the operation display unit 6 . Further, the control unit 12 controls the inverter 13 based on the cooking temperature set by the user and the temperature of the cooking vessel 300 calculated by the temperature detection unit 11 to perform heating control.

The inverter 13 is a drive circuit that converts AC power from the commercial power source 200 into a high-frequency current and supplies the high-frequency current to the heating coil 5 . Note that the induction heating cooker 100 may include a configuration other than that shown in FIG. 2, and may include, for example, a communication unit that communicates with an external device. Alternatively, the control unit 12 may have the function of the temperature detection unit 11 and the temperature detection unit 11 may be omitted.

(Operation of induction heating cooker)
Next, operation of induction heating cooker 100 of the present embodiment will be described. First, when the user turns on the power switch of the front operation section 3, the control section 12 is activated. When the user sets the cooking temperature using the operation display unit 6 or the like and instructs the start of heating, the control unit 12 drives the heating coil 5 . Specifically, the controller 12 controls the inverter 13 so as to drive the heating coil 5 based on the temperature set by the user, and the inverter 13 supplies power of a predetermined frequency to the heating coil 5 .

As a result, a magnetic flux is generated from the heating coil 5, and the magnetic flux generates an eddy current in the cooking vessel 300, thereby heating the cooking vessel 300. FIG. The infrared rays emitted from the cooking vessel 300 are received by the non-contact temperature sensor 20 , and an output value corresponding to the amount of received light is output to the temperature detection section 11 . In addition, the amount of heat generated by heating the cooking vessel 300 is thermally conducted to the top plate 2 , thereby heating the top plate 2 . A contact-type temperature sensor 30 arranged below the top plate 2 detects the top plate temperature and outputs a corresponding output value to the temperature detection section 11 .

The temperature detection unit 11 obtains the temperature of the cooking vessel 300 based on the output value of the non-contact temperature sensor 20 and the output value of the contact temperature sensor 30 and transmits the temperature to the control unit 12 . For example, when the non-contact temperature sensor 20 is composed of a thermopile, the temperature detection unit 11 detects the difference between the temperature corresponding to the output value of the non-contact temperature sensor 20 and the temperature corresponding to the output value of the contact temperature sensor 30. The difference is obtained as the temperature of the cooking vessel 300 .

Then, feedback control is performed by the control unit 12 so that the temperature of the cooking vessel 300 transmitted from the temperature detection unit 11 becomes the set temperature. Specifically, power is supplied to the heating coil 5 when the temperature of the cooking vessel 300 is lower than the set temperature. Then, when the temperature of the cooking container 300 approaches the set temperature, the frequency of the power supplied is increased to reduce the power supplied to the heating coil 5 . Further, when the temperature of the cooking container 300 exceeds the set temperature, the controller 12 stops the inverter 13 and stops the power supply to the heating coil 5 . By repeating the above operation until the end of cooking, the temperature of the cooking container 300 is maintained at the set temperature. When the temperature of the cooking vessel 300 obtained by the temperature detecting section 11 is equal to or higher than the preset upper limit value, the control section 12 determines that the temperature of the cooking vessel 300 has become too high, and drives the heating coil 5. may be stopped.

When the cooking is completed, the controller 12 stops the inverter 13 and cuts off the power supply to the heating coil 5 . With such control, automatic heating cooking according to the set temperature is performed in the induction heating cooker 100 .

(Configuration of heating coil unit)
Next, the heating coil unit 50 in this embodiment will be described. FIG. 3 is a top view of the heating coil unit 50 of this embodiment. FIG. 4 is an exploded perspective view of the heating coil unit 50 of this embodiment. FIG. 5 is an end view of a section of the heating coil unit 50 taken along line AA of FIG. As shown in FIGS. 3 to 5, the heating coil unit 50 includes the heating coil 5, the ferrite 51 arranged below the heating coil 5, and the insulating means 52 arranged between the heating coil 5 and the ferrite 51. and holding means 53 for holding them.

The heating coil 5 is a circular coil formed by winding a conductive wire such as a copper wire or an aluminum wire, and generates a high frequency magnetic field by being supplied with a high frequency current. In this embodiment, the heating coil 5 is a double annular coil divided into a first coil 5a and a second coil 5b. Also, the first coil 5 a and the second coil 5 b are electrically connected and driven by the same inverter 13 . The shape of the heating coil 5 and the configuration of the drive circuit are not limited to these. For example, the shape of the heating coil 5 may be oval. Also, the configuration of the coil may be three or more loops, or may be configured by combining a plurality of coils. Also, the divided coils may not be electrically connected, and may be independently driven by a plurality of inverters.

The ferrite 51 is made of a ferromagnetic material that is non-conductive and has a high magnetic permeability. By converging and deflecting the high-frequency magnetic flux generated from the heating coil 5 by the ferrite 51 and directing it toward the object to be heated above, the heating efficiency can be improved and the cooking vessel 300 can be heated uniformly. Further, by providing the ferrite 51 below the heating coil 5, magnetic flux leaking downward from the heating coil 5 can be suppressed. Ferrite 51 of the present embodiment has a plurality of legs radially extending from a central portion disposed inside first coil 5a. Moreover, in this embodiment, the eight legs are evenly spaced apart from each other. The shape and arrangement of ferrite 51 are not limited to those of this embodiment. For example, the center portion and each leg portion of the ferrite 51 may be configured separately.

The insulating means 52 is a circular plate made of an insulating material such as mica. Also, the outer diameter of the insulating means 52 is formed to be larger than the outer diameter of the second coil 5b. The insulating means 52 is arranged between the heating coil 5 and the ferrite 51 to prevent the heating coil 5 from being damaged due to direct contact between the heating coil 5 and the ferrite 51 . Further, by arranging the insulating means 52 between the heating coil 5 and the holding means 53, the heating coil 5 and the holding means 53 are insulated. As shown in FIG. 4, the insulating means 52 are provided with openings 520 . The opening 520 is provided at a position corresponding to the opening 530 of the holding means 53 and has substantially the same shape and size as the opening 530 . The size and shape of the insulating means 52 are not limited to those of this embodiment. For example, a plurality of small insulating means 52 may be arranged between the heating coil 5 and the ferrite 51 .

The holding means 53 is a coil base that holds the heating coil 5 , the ferrite 51 and the insulating means 52 below the heating port 4 . The holding means 53 is made of a non-magnetic and electrically conductive metal such as aluminum or copper, and serves also as magnetic shielding means for reducing the intrusion of the magnetic flux generated by the heating coil 5 below the holding means 53. there is Further, the holding means 53 is electrically connected to the GND of the housing of the main body 1 or the control circuit board of the control section 12 . Thereby, it is possible to suppress the holding means 53 from being affected by the magnetic flux generated from the heating coil 5 . Further, the holding means 53 is formed with screw holes (not shown) for fixing the non-contact temperature sensor 20 and the contact temperature sensor 30 .

Magnetic shielding ribs 532 are formed along the entire circumference of the holding means 53 . Magnetic shield rib 532 is formed by bending the outer periphery of holding means 53 . Alternatively, the antimagnetic rib 532 may be formed by attaching a ring-shaped member to the outer circumference of the holding means 53 . In either case, the magnetic shield ribs 532 are made of a non-magnetic and electrically conductive metal to reduce magnetic flux leakage to the outside of the heating coil unit 50 .

An opening 530 is also provided in the holding means 53 . As shown in FIG. 3, the opening 530 is the same as the space formed between the outer peripheral side surface of the first coil 5a, the inner peripheral side surface of the second coil 5b, and two adjacent legs of the ferrite 51. It has an approximately trapezoidal shape. As shown in FIG. 3, two openings 530 are provided in the holding means 53 of the present embodiment, and the non-contact temperature sensor 20 and the contact temperature sensor 30 are positioned in the openings 530 when viewed from above. are arranged as follows. The shape of the opening 530 is not limited to that of the present embodiment, and may be larger than the detection field of the non-contact temperature sensor 20 or the detection portion of the contact temperature sensor 30 .

At least part of the periphery of the opening 530 of the holding means 53 is provided with a magnetic shielding rib 531 facing the side surface of the heating coil 5 . In this embodiment, two magnetic shielding ribs 531 are formed to face the outer peripheral side surface of the first coil 5a and the inner peripheral side surface of the second coil 5b, respectively. The two magnetic shielding ribs 531 protrude toward the heating coil 5, i.e. upward, along the sides parallel to the outer peripheral side surface of the first coil 5a and the inner peripheral side surface of the second coil 5b in the peripheral edge of the opening 530. It is formed.

Moreover, as shown in FIG. 5, it is desirable that the top surface of the magnetic shield rib 531 be positioned above the top surface of the heating coil 5 . However, the height of magnetic shield rib 531 is not limited to the example of this embodiment, and the upper surface of magnetic shield rib 531 may be positioned above the lower surface of heating coil 5 . That is, at least part of the magnetic shield rib 531 should face the side surface of the heating coil 5 .

Further, the magnetic shield rib 531 of the present embodiment is constituted by a part of the holding means 53 and has non-magnetism and electrical conductivity like the holding means 53 . 6A and 6B are diagrams for explaining a method of forming the anti-magnetic rib 531 in the holding means 53 of this embodiment. First, three notches 60 indicated by solid lines in FIG. 6 are made in the holding means 53 . Then, the part where the notch 60 is made is bent upward along the dashed line shown in FIG. Thereby, the magnetic shield rib 531 can be easily formed. Note that the shape and size of the cut 60 are not limited to the example shown in FIG.

Referring back to FIGS. 2 to 5, assembly of the heating coil unit 50 will be described. As shown in FIG. 4 , the heating coil 5 , the insulating means 52 and the ferrite 51 are laminated on the holding means 53 and adhered to each other with an adhesive to form a thin heating coil unit 50 . Here, as shown in FIG. 2, the amount of infrared rays from the cooking vessel 300 is detected through the opening of the heating coil unit 50. As shown in FIG. The contact temperature sensor 30 is also connected to a control circuit or the like through the opening of the heating coil unit 50 . The opening of the heating coil unit 50 is formed by the gap between the first coil 5a and the second coil 5b, the opening 520 of the insulating means 52, the gap between the legs of the ferrite 51, and the opening 530 of the holding means 53. Therefore, each member is laminated so that the gap between the first coil 5a and the second coil 5b, the opening 520 of the insulating means 52, the gap between the legs of the ferrite 51, and the opening 530 of the holding means 53 are at the same position when viewed from above. There is a need.

For example, if the stacking position of each member deviates from the predetermined position, the member covers the field of view of the non-contact temperature sensor 20 . As a result, the temperature detection accuracy of the non-contact temperature sensor 20 is lowered, which affects cooking. Further, if the lamination positions of the ferrite 51 and the heating coil 5 are misaligned, the magnetic flux generated by the heating coil 5 cannot be directed to the object to be heated, making it impossible to improve the heating efficiency. Furthermore, if the position of the heating coil 5 is displaced from the heating port 4, uneven heating of the cooking vessel 300 may occur, and optimal heating control may not be possible.

In the present embodiment, when the heating coil 5, the insulating means 52 and the ferrite 51 are stacked on the holding means 53, the antimagnetic ribs 531 of the holding means 53 are used for positioning the heating coil 5, the insulating means 52 and the ferrite 51. can do. Specifically, the ferrite 51 is held at a predetermined position on the holding means 53 by fitting the anti-magnetic ribs 531 of the holding means 53 into the gaps between two adjacent legs among the plurality of legs of the ferrite 51 . placed. By fitting the anti-magnetic rib 531 of the holding means 53 into the opening 520 of the insulating means 52 , the insulating means 52 is arranged at a predetermined position on the holding means 53 . The heating coil 5 is arranged at a predetermined position on the holding means 53 by fitting the antimagnetic rib 531 of the holding means 53 between the first coil 5a and the second coil 5b.

Thereby, the heating coil 5, the insulating means 52 and the ferrite 51 can be arranged at appropriate positions. In addition, the positional deviation of each member is suppressed, and the opening of the heating coil unit 50 can be secured. As a result, it is possible to suppress deterioration in temperature detection accuracy, improve heating efficiency, and achieve optimal heating control. In addition, by using the anti-magnetic ribs 531 of the holding means 53, the heating coil 5, the insulating means 52 and the ferrite 51 can be easily positioned.

FIG. 7 is a perspective view showing the direction of the magnetic field of the heating coil 5 in this embodiment. In FIG. 7, the current flowing through the heating coil 5 is indicated by a dashed line, and the magnetic flux generated from the heating coil 5 is indicated by a solid line. 7, illustration of the insulating means 52 is omitted. When an electric current flows through the heating coil 5, magnetic flux is generated in a direction perpendicular to the direction of the electric current. Specifically, as shown in FIG. 7, when the direction of the current flowing through the heating coil 5 is clockwise, the direction perpendicular to the current is the direction from the outside to the inside on the upper surface of the heating coil 5. A magnetic flux is generated in the direction from the inside to the outside on the lower surface of the . Also, although not shown, when the direction of the current flowing through the heating coil 5 is counterclockwise, the direction perpendicular to the current is from inside to outside on the upper surface of the heating coil 5, and on the lower surface of the heating coil 5. A magnetic flux is generated in the direction from the outside to the inside. At this time, by disposing the holding means 53 that also serves as a magnetic shielding means below the heating coil 5, leakage of the magnetic flux to the lower side of the holding means 53 is suppressed. Furthermore, at the location where the ferrite 51 with high magnetic permeability is arranged below the heating coil 5, the generated magnetic flux passes through the inside of the ferrite 51, so that leakage of the magnetic flux further downward is suppressed.

Here, the non-contact temperature sensor 20 is arranged below the opening 530 of the holding means 53. Since it is necessary to detect the infrared rays from the cooking vessel 300, there is a metal Magnetic shielding means such as plates or ferrites cannot be placed. Therefore, when the magnetic flux generated from the heating coil 5 enters the opening 530 , electromagnetic noise is superimposed on the detection result of the non-contact temperature sensor 20 . Further, the contact temperature sensor 30 in contact with the top plate 2 is arranged above the ferrite 51 and the holding means 53, which are magnetic shielding means. Therefore, the contact temperature sensor 30 is also affected by the magnetic flux generated from the heating coil 5, and the detection accuracy is lowered.

Therefore, in the present embodiment, a magnetic shielding rib 531 is provided around the opening 530 of the holding means 53 to prevent the magnetic flux generated from the heating coil 5 from entering the opening 530 . The magnetic shielding ribs 531 of the present embodiment are arranged to face the outer peripheral side surface of the first coil 5a and the inner peripheral side surface of the second coil 5b, respectively. In other words, the magnetic shielding ribs 531 are formed along a direction parallel to the direction of current flow in the first coil 5a and the second coil 5b, that is, along a direction perpendicular to the direction of the magnetic flux. As a result, the magnetic flux generated from the heating coil 5 is blocked by the anti-magnetic ribs 531 , and entry of the magnetic flux into the opening 530 is suppressed. When the magnetic flux generated from the heating coil 5 is incident on the magnetic shield rib 531 , an eddy current flows through the magnetic shield rib 531 and magnetic flux is generated in a direction that cancels the magnetic flux incident on the magnetic shield rib 531 . As a result, the magnetic flux around the opening 530 is reduced, and entry of the magnetic flux into the opening 530 is suppressed. As a result, leakage magnetic flux from the opening 530 to the lower side of the holding means 53 can be suppressed, and deterioration in the detection accuracy of the non-contact temperature sensor 20 and the contact temperature sensor 30 arranged in the opening 530 in top view can be prevented. In this embodiment, the magnetic shielding rib 531 is provided on the periphery of the opening 530 of the holding means 53, but the "periphery" of the opening 530 means not only the periphery of the opening 530 but also the magnetic flux flowing into the opening 530. including the vicinity of the perimeter of the opening 530 in a range that can block the intrusion of

In the present embodiment, the holding means 53 for holding the heating coil 5, the insulating means 52, and the ferrite 51 also serves as magnetic shielding means, and by providing the magnetic shielding ribs 531, the non-contact temperature sensor 20 and the contact temperature sensor The influence of magnetic flux on 30 can be suppressed. Therefore, it is not necessary to provide additional magnetic shielding means below the heating coil unit 50 . As a result, the heating coil unit 50 can be compared with the case where the coil base for holding the heating coil 5, the insulating means 52 and the ferrite 51 and the magnetic shielding means for preventing magnetic flux from entering below the coil base are separately provided. can be realized. Further, since there is no need to separately provide magnetic shielding means in the sensor case 21 of the non-contact temperature sensor 20, it is possible to reduce the number of man-hours and the number of parts.

Modification 1-1.
The number and arrangement of openings 530 and magnetic shield ribs 531 in holding means 53 are not limited to those of the first embodiment. FIG. 8 is a top view of a heating coil unit 50A in Modification 1-1, and FIG. 9 is a perspective view of holding means 53A in Modification 1-1.

As shown in FIGS. 8 and 9, in the holding means 53A of this modified example, an opening 530 is provided in the entire space between the outer circumference of the first coil 5a and the inner circumference of the second coil 5b where the ferrite 51 is not arranged. is provided. In other words, the opening 530 is provided in the holding means 53A regardless of the arrangement of the non-contact temperature sensor 20 and the contact temperature sensor 30 . Magnetic shielding ribs 531 similar to those in the first embodiment are formed on the periphery of each opening 530 . Further, openings 520 corresponding to the openings 530 of the holding means 53 are provided in the insulating means 52A of this modified example.

With the configuration of this modified example, in addition to the effects of the first embodiment, the non-contact temperature sensor 20 and the contact temperature sensor 30 can be arranged in any opening 530, and the heating coil unit 50A versatility can be enhanced. This eliminates the need to individually manufacture the holding means 53A and the insulating means 52A for each product, so that manufacturing equipment, molds, or the like for the holding means 53A and the insulating means 52A can be diverted for use. As a result, costs in the manufacturing process can be reduced.

Modification 1-2.
Also, the shape of the magnetic shield rib 531 in the holding means 53 is not limited to that of the first embodiment. FIG. 10 is a perspective view of a heating coil unit 50B in Modification 1-2, and FIG. 11 is a perspective view of holding means 53B in Modification 1-2.

As shown in FIGS. 10 and 11, the holding means 53B of this modified example is provided with antimagnetic ribs 531B along the entire periphery of the opening 530. As shown in FIGS. The top surface of the magnetic shield rib 531B is preferably positioned above the top surface of the heating coil 5, as with the magnetic shield rib 531 of the first embodiment. In this way, by surrounding the opening 530 with the magnetic shielding ribs 531B, the magnetic flux generated from the heating coil 5 is blocked from entering the opening 530, and heat radiation generated from the heating coil 5 or the ferrite 51 and the heat generated from the main body 1 are blocked. It is possible to cut off the cooling air flowing inside the housing.

Further, when assembling the heating coil unit 50B, between the two adjacent legs of the ferrite 51, between the opening 520 of the insulating means 52 and between the first coil 5a and the second coil 5b, the magnetic shielding rib of the holding means 53B 531B is fitted. Thereby, the ferrite 51, the insulating means 52 and the heating coil 5 can be arranged at predetermined positions on the holding means 53B.

With a configuration like this modification, in addition to the effects of the first embodiment, it is possible to suppress the influence of disturbance on the non-contact temperature sensor 20 and the contact temperature sensor 30 arranged in the opening 530. . This improves the temperature detection accuracy of the non-contact temperature sensor 20 and the contact temperature sensor 30, and also improves robustness against variations.

Modification 1-3.
FIG. 12 is a top view of a heating coil unit 50C in Modification 1-3, and FIG. 13 is a perspective view of the heating coil unit 50C in Modification 1-3. As shown in FIGS. 12 and 13, the holding means 53C of Modification 1-3 is provided with a circular opening 530C and a cylindrical magnetic shielding rib 531C formed along the periphery of the opening 530C. Each opening 530 is formed slightly larger than the viewing range of the non-contact temperature sensor 20 and the contact range of the contact temperature sensor 30 . Moreover, it is desirable that the top surface of the magnetic shield rib 531C be located above the top surface of the heating coil 5, as with the magnetic shield rib 531 of the first embodiment.

Also, the insulating means 52C is provided with a circular opening 520C corresponding to the opening 530C of the holding means 53C. 52 C of insulation means are the same as that of the insulation means 52 of Embodiment 1 except the shape of 520 C of openings.

Further, the opening 530C and the magnetic shielding rib 531C of this modified example are provided in the space between the outer peripheral side surface of the first coil 5a, the inner peripheral side surface of the second coil 5b, and the two adjacent legs of the ferrite 51. . More specifically, the opening 530C and the magnetic shielding rib 531C are provided at the corner between one of the two adjacent legs of the ferrite 51 and the inner peripheral side surface of the second coil 5b. When assembling the heating coil unit 50C, a magnetic shielding rib 531C is fitted between two adjacent legs of the ferrite 51, between the opening 520C of the insulating means 52, and between the first coil 5a and the second coil 5b. . Thereby, the ferrite 51, the insulating means 52 and the heating coil 5 can be arranged at predetermined positions on the holding means 53C.

By configuring as in this modified example, the opening 530C of the holding means 53C can be made smaller than the opening 530 of the first embodiment. As a result, the strength of the holding means 53C is increased, and magnetic flux can be further suppressed from entering below the holding means 53C.

Modification 1-4.
FIG. 14 is an end view of a heating coil unit 50D in modification 1-4. 14 shows an end face of the heating coil unit 50D cut along line AA in FIG. As shown in FIG. 14, an inverted U-shaped magnetic shielding rib 531D folded downward is provided in the opening 530 of the holding means 53D of this modified example. Moreover, it is desirable that the top surface of the magnetic shield rib 531D be positioned above the top surface of the heating coil 5, as with the magnetic shield rib 531 of the first embodiment. The configuration of the heating coil unit 50D is the same as that of the first embodiment except for the shape of the magnetic shield rib 531D.

In this modification, the magnetic shielding rib 531D has a double structure, so that the magnetic shielding effect against the magnetic flux generated from the heating coil 5 is improved. In addition, the air layer formed on the magnetic shield rib 531D can block heat radiation from the heating coil 5 and the ferrite 51, thereby improving heat insulation. As a result, deterioration in the detection accuracy of the non-contact temperature sensor 20 and the contact temperature sensor 30 arranged in the opening 530 can be suppressed.

Modification 1-5.
FIG. 15 is an end view of a heating coil unit 50E in modification 1-5. 15 shows an end face of the heating coil unit 50E cut along line AA in FIG. As shown in FIG. 15, the holding means 53E of this modification has a painted surface 533 painted black or brown on the inner surface of the magnetic shield rib 531E. The configuration of the heating coil unit 50D other than the coating surface 533 is the same as that of the first embodiment. By providing the black or brown painted surface 533 on the inner surface of the magnetic shield rib 531E, the reflectance of light or infrared rays passing through the magnetic shield rib 531 is lowered, and the heat absorption rate is increased.

By configuring as in this modification, the outer surface of the magnetic shield rib 531E blocks magnetic flux and reflects heat, while the inner surface absorbs heat. Thereby, the influence of disturbance on the non-contact temperature sensor 20 and the contact temperature sensor 30 can be reduced. In addition, the coated surface 533 suppresses the irregular reflection of infrared rays passing through the magnetic shield ribs 531E, and increases the proportion of physical quantities such as infrared rays from the top plate 2 or the cooking vessel 300 that the non-contact temperature sensor 20 receives. This improves the detection accuracy of the non-contact temperature sensor 20 . In addition, the interior of the main body can be made more difficult to see through the transmissive window 40 of the top plate 2, thereby improving the design.

Modification 1-6.
Furthermore, the configurations described in Embodiment 1 and Modifications 1-1 to 1-5 may be combined arbitrarily. FIG. 16 is a perspective view of a heating coil unit 50F in modification 1-6. As shown in FIG. 16, in the holding means 53F of this modified example, a magnetic shield rib 531 of Embodiment 1 shown in FIG. 3 and a magnetic shield rib 531C of Modified Example 1-3 shown in FIG. Both are provided. Also, as shown in FIG. 16, magnetic shielding ribs 531C may be provided outside the second coil 5b.

As in this modification, by appropriately combining Embodiment 1 and Modifications 1-1 to 1-5, the effects described in Embodiment 1 and Modifications 1-1 to 1-5 can be obtained. can be obtained. Note that the combination of the shapes of the magnetic shield ribs 531 is not limited to Modification 1-6, and may vary according to each configuration of the heating coil unit 50, or the shape and arrangement of the non-contact temperature sensor 20 or the contact temperature sensor 30. can be combined arbitrarily.

Embodiment 2.
Next, Embodiment 2 of the present invention will be described. Embodiment 2 differs from Embodiment 1 in that heating coil unit 50G further includes protection means 54 . Other configurations and controls of induction heating cooker 100 are the same as those of the first embodiment.

FIG. 17 is an exploded perspective view of heating coil unit 50G in this embodiment, and FIG. 18 is an end view of heating coil unit 50G in this embodiment. 18 shows an end face of the heating coil unit 50G cut along line AA in FIG. As shown in FIGS. 17 and 18, a heating coil unit 50G of the present embodiment includes a heating coil 5, a ferrite 51, an insulating means 52, a holding means 53, and a protection unit arranged on the upper surface of the heating coil 5. means 54;

The protective means 54 is a circular plate-shaped member made of the same insulating material as the insulating means 52, such as mica. The outer diameter of the protection means 54 is formed larger than the outer diameter of the second coil 5b. As shown in FIG. 17, the protective means 54 are provided with openings 540 . The opening 540 is provided at a position corresponding to the opening 530 of the holding means 53 and has substantially the same shape and size as the opening 530 . Further, as shown in FIG. 18, the upper surface of the anti-magnetic rib 531 of the holding means 53 is located above the lower surface of the protective means 54 . Accordingly, by fitting the opening 540 of the protection means 54 into the antimagnetic rib 531 , the protection means 54 is positioned at a predetermined position on the holding means 53 .

By configuring as in the present embodiment, in addition to the effects of the first embodiment, damage to the heating coil 5 or overheating of the top plate 2 due to contact between the heating coil 5 and the top plate 2 can be prevented. can do. The shape of the protection means 54 is not limited to the example of the second embodiment, and can be arbitrarily selected.

Modification 2-1.
FIG. 19 is an end view of a heating coil unit 50H in modification 2-1. 19 shows an end face of the heating coil unit 50H cut along line AA in FIG. As shown in FIG. 19, the magnetic shield rib 531H of the holding means 53H of this modified example has a bent portion 534 that bends toward the protective means 54, that is, toward the outside of the opening 540, on the upper surface of the protective means 54. As shown in FIG.

Adhesiveness of the heating coil unit 50H is improved by adopting a configuration like this modified example. This improves the workability when attaching the heating coil unit 50</b>H to the main body 1 .

Embodiment 3.
Next, Embodiment 3 of the present invention will be described. A heating coil unit 50J of the third embodiment differs from that of the first embodiment in the shape of the insulating means 52J. Other configurations and controls of induction heating cooker 100 are the same as those of the first embodiment.

FIG. 20 is an end view of heating coil unit 50J in this embodiment, and FIG. 21 is a perspective view of insulating means 52J in this embodiment. 20 shows an end face of the heating coil unit 50J cut along line AA in FIG. As shown in FIGS. 20 and 21, the insulating means 52J of the present embodiment is provided with insulating ribs 521 on the periphery of the opening 520 facing the outer surfaces of the magnetic shield ribs 531 of the holding means 53. As shown in FIG. The insulating rib 521 is formed by, for example, cutting a portion of the insulating means 52J and bending it upward, similarly to the magnetic shield rib 531 . In addition, as shown in FIG. 20, it is desirable that the upper surface of the insulating rib 521 be located above the upper surfaces of the first coil 5a and the second coil 5b.

In addition to the effects of the first embodiment, the structure of the present embodiment provides the insulating ribs 521 of the insulating means 52J to hold the outer peripheral side surface of the first coil 5a and the inner peripheral side surface of the second coil 5b. It is possible to prevent the means 53 from coming into contact with the anti-magnetic ribs 531 . Thereby, the holding means 53 is insulated from the first coil 5a and the second coil 5b. In addition, by fitting the insulating rib 521 into the gap between the first coil 5a and the second coil 5b, the heating coil 5 can be easily positioned.

Modification 3-1.
When the heating coil unit 50 is provided with the protection means 54 as in the second embodiment, the protection ribs 541 may be provided on the protection means 54 . FIG. 22 is an end view of a heating coil unit 50K in Modification 3-1 in this case. 22 shows an end face of the heating coil unit 50K cut along line AA in FIG. As shown in FIG. 22, in this modified example, a protective rib 541 is provided on the periphery of the opening 540 of the protective means 54K and faces the outer surface of the anti-magnetic rib 531 of the holding means 53. As shown in FIG. The protection rib 541 is formed by, for example, cutting a portion of the protection means 54K and bending it downward. Moreover, as shown in FIG. 22, the lower surfaces of the protective ribs 541 are preferably located on the lower surfaces of the first coil 5a and the second coil 5b.

Also in the case of this modification, it is possible to insulate the first coil 5a and the second coil 5b from the holding means 53, as in the third embodiment. Also, as a further modification, insulating ribs 521 and 541 may be formed on both the insulating means 52J and the protective means 54K, respectively.

Embodiment 4.
Next, Embodiment 4 of the present invention will be described. A heating coil unit 50L of the fourth embodiment differs from that of the first embodiment in that a plurality of heating coils 5 are provided. Other configurations and controls of induction heating cooker 100 are the same as those of the first embodiment.

FIG. 23 is a perspective view of a heating coil unit 50L according to this embodiment, and FIG. 24 is a perspective view of a holding means 53L according to this embodiment. As shown in FIGS. 23 and 24, in a heating coil unit 50L of the present embodiment, a plurality of heating coils 5, ferrite 51 and insulating means 52 are arranged in rectangular holding means 53L. In the example of Figures 23 and 24, two heating coils 5, ferrites 51 and insulating means 52 are arranged.

24, the holding means 53L has two sets of openings 530 and antimagnetic ribs 531 corresponding to the two heating coils 5. As shown in FIG. The shapes of openings 530 and magnetic shield ribs 531 are the same as in the first embodiment. Then, the ferrite 51, the insulating means 52 and the heating coil 5 are positioned and laminated on the magnetic shielding rib 531 in the same manner as in the first embodiment.

By configuring as in this embodiment, the number of holding means 53L can be reduced. As a result, the number of man-hours for attaching the holding means 53L to the main body 1 can be reduced, the positioning of the plurality of heating coils 5 can be facilitated, and misalignment between the heating coils 5 can be prevented. The shape of the holding means 53L, the shape of the antimagnetic ribs 531, the number of the heating coils 5 to be arranged, etc. are not limited to the example of the fourth embodiment, and can be arbitrarily selected.

Embodiment 5.
Next, Embodiment 5 of the present invention will be described. Induction heating cooker 100A of Embodiment 5 differs from Embodiment 1 in the arrangement of non-contact temperature sensor 20 . Other configurations and controls of induction heating cooker 100A are the same as in the first embodiment.

FIG. 25 is a schematic configuration diagram of main parts of an induction heating cooker 100A according to Embodiment 5. As shown in FIG. As shown in FIG. 25, in this embodiment, the top surface of the non-contact temperature sensor 20 is arranged above the bottom surface of the holding means 53 and below the top surface of the magnetic shield rib 531 . That is, the non-contact temperature sensor 20 enters inside the magnetic shield rib 531 .

At this time, when the sensor case 21 of the non-contact temperature sensor 20 and the inner surface of the magnetic shield rib 531 come into contact with each other, the heat of the holding means 53 is transmitted to the sensor case 21 and the non-contact temperature sensor 20, and the non-contact temperature The detection accuracy of the sensor 20 is degraded. Therefore, the sensor case 21 of the non-contact temperature sensor 20 is arranged with a gap between it and the inner surface of the magnetic shield rib 531 . Thereby, it is possible to suppress the heat of the holding means 53 from being transmitted to the sensor case 21 and the non-contact temperature sensor 20 .

By adopting the configuration of this embodiment, the non-contact temperature sensor 20 , which is projected downward from the holding means 53 , can be brought closer to the top plate 2 . As a result, the induction heating cooker 100A can be further thinned. The position of the non-contact temperature sensor 20 is not limited to the position described above, and the lower surface of the non-contact temperature sensor 20 may be arranged above the lower surface of the holding means 53 .

Modification 5-1.
The arrangement of non-contact temperature sensor 20 and contact temperature sensor 30 is not limited to that of the first embodiment or the fifth embodiment. FIG. 26 is a schematic configuration diagram of the main part of an induction heating cooker 100B in modification 5-1. As shown in FIG. 26, in Modified Example 5-1, both the non-contact temperature sensor 20 and the contact temperature sensor 30 are arranged within one opening 530 of the holding means 53 .

By arranging the non-contact temperature sensor 20 and the contact temperature sensor 30 in the same opening 530 as in this modification, temperature detection can be performed in the same environment. Thereby, temperature correction can be performed using the detected value of the non-contact temperature sensor 20 or the contact temperature sensor 30, and the accuracy of the temperature of the cooking vessel 300 is improved. Note that the number of temperature sensors arranged within the same opening 530 is not limited to the above, and can be selected arbitrarily.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and can be variously modified without departing from the scope of the present invention. is. Further, the present invention includes all possible combinations of the configurations shown in the above embodiments and modifications. For example, the ferrite 51 is not an essential component and can be omitted. Also in this case, the heating coil 5 and the holding means 53 can be insulated by arranging the insulating means 52 between the heating coil 5 and the holding means 53 .

Moreover, the number and arrangement of the non-contact temperature sensors 20 and the contact temperature sensors 30 in the induction heating cooker 100 are not limited to the above. By arranging the contact-type temperature sensor 30 in the vicinity of the location where the heating coil 5 reaches the highest temperature, it is possible to control the temperature of the heating coil 5 to prevent excessive temperature rise with high accuracy. In addition, by arranging the contact temperature sensor 30 also on the outer circumference of the heating coil 5, it is possible to detect pot slippage with high accuracy. Also, a detection device other than the non-contact temperature sensor 20 and the contact temperature sensor 30 may be arranged in the opening 530 of the holding means 53 . For example, an emissivity measuring device may be placed in aperture 530 . Also, a plurality of detection devices may be mounted on the same substrate or housed in the same case.

Further, the method of forming the anti-magnetic ribs 531 of the holding means 53 is not limited to the example shown in FIG. 6, and various methods can be used. For example, a metal plate serving as the base of the holding means 53 may be pressed. Furthermore, the antimagnetic rib 531 may be provided as a separate member and attached to the holding means 53 by welding, screws, or the like. In this case, the holding means 53 and the magnetic shielding ribs 531 are electrically and thermally connected so that electromagnetic noise or heat to the magnetic shielding ribs 531 diffuses to the holding means 53 . Also, the holding means 53 and the antimagnetic ribs 531 may be formed using different materials. For example, the holding means 53 may be made of resin, and only the magnetic shielding rib 531 may have the magnetic shielding function. Furthermore, a magnetic shielding rib 531 may be provided parallel to the outer circumference of the second coil 5b.

Furthermore, in the above-described embodiment, the two magnetic shielding ribs 531 are formed so as to face the outer peripheral side surface of the first coil 5a and the inner peripheral side surface of the second coil 5b held by the holding means 53, respectively. It is not limited. For example, a magnetic shielding rib 531 facing the outer peripheral side surface of the second coil 5b held by another holding means 53 may be further provided. Thereby, the influence of the magnetic flux generated from other heating coils 5 can also be reduced.

1 main body 2 top plate 3 front operation unit 4 heating port 5 heating coil 5a first coil 5b second coil 6 operation display unit 11 temperature detection unit 12 control unit 13 inverter 20 non-contact type temperature sensor 21 sensor case 30 contact temperature sensor 40 transmission window 50, 50A, 50B, 50C, 50D, 50E, 50F, 50G, 50H, 50J, 50K, 50L heating coil unit 51 ferrite 52, 52A, 52C, 52J insulation means 53, 53A, 53B, 53C, 53D, 53E, 53F, 53H, 53L holding means 54, 54K protection means 60 notch 100, 100A, 100B induction heating cooker 200 commercial power supply , 300 cooking vessel, 520, 520C opening, 521 insulating rib, 530, 530C opening, 531, 531B, 531C, 531D, 531E, 531H, 532 magnetic shielding rib, 533 painted surface, 534 bent portion, 540 opening, 541 protective rib.

Claims (21)

a top plate on which the cooking container is placed;
a heating coil disposed below the top plate for heating the cooking vessel;
holding means arranged below the heating coil and holding the heating coil;
a ferrite disposed between the heating coil and the holding means;
and a sensor that detects the state of the cooking container,
the holding means has an opening,
The sensor is arranged in the opening in top view,
At least part of the periphery of the opening is provided with a magnetic shielding rib at least partly facing the side surface of the heating coil ,
An induction heating cooker in which the top surface of the magnetic shield rib is located above the bottom surface of the heating coil . 2. The induction heating cooker according to claim 1, further comprising insulation means disposed between said heating coil and said holding means. The insulating means has an opening,
3. The induction heating cooker according to claim 2, wherein an insulating rib facing said antimagnetic rib is provided on the periphery of said opening of said insulating means. 4. The induction heating cooker according to claim 2, wherein said ferrite is arranged between said insulating means and said holding means. The induction heating cooker according to any one of claims 1 to 4, wherein the top surface of the magnetic shield rib is located above the top surface of the heating coil. The induction heating cooker according to any one of claims 1 to 5, wherein the holding means has non-magnetism and electrical conductivity. 7. The magnetic shielding rib is formed from a part of the holding means, or is formed of a separate member from the holding means, and is electrically and thermally connected to the holding means. The induction heating cooker according to . The induction heating cooker according to any one of claims 1 to 7, wherein the magnetic shield rib is used for positioning the heating coil. The induction heating cooker according to any one of claims 1 to 8, wherein at least part of said magnetic shield rib extends in a direction parallel to the direction of current flow in said heating coil. The induction heating cooker according to any one of claims 1 to 9, wherein the anti-magnetic rib is provided around the entire circumference of the opening of the holding means. The induction heating cooker according to any one of claims 1 to 10, wherein the magnetic shield rib has a folded inverted U shape. The induction heating cooker according to any one of claims 1 to 11, wherein the magnetic shield rib has a coated surface coated with a material having low light or infrared reflectance and high heat absorption. further comprising protective means disposed above the heating coil;
The induction heating cooker according to any one of claims 1 to 12, wherein the top surface of the magnetic shield rib is located above the bottom surface of the protection means. 14. The induction heating cooker according to claim 13, wherein the magnetic shield rib has a bent portion that bends toward the protective means on the upper surface of the protective means. the protection means has an opening,
15. The induction heating cooker according to claim 13 or 14, wherein protective ribs facing said magnetic shield ribs are provided on the periphery of said opening of said protective means. comprising a plurality of the heating coils,
The induction heating cooker according to any one of claims 1 to 15, wherein the holding means holds the plurality of heating coils. The induction heating cooker according to any one of claims 1 to 16, wherein the lower surface of said sensor is arranged above the lower surface of said holding means. comprising a plurality of said sensors;
The induction heating cooker according to any one of claims 1 to 17, wherein the plurality of sensors are arranged within one opening of the holding means when viewed from above. The induction heating cooker according to any one of claims 1 to 18, wherein the sensor is a non-contact temperature sensor, a contact temperature sensor, or an emissivity measuring device. a top plate on which the cooking container is placed;
a heating coil disposed below the top plate for heating the cooking vessel;
holding means arranged below the heating coil and holding the heating coil;
insulating means disposed between the heating coil and the holding means;
a ferrite disposed between the insulating means and the holding means;
and a sensor that detects the state of the cooking container,
the holding means and the insulating means each have an opening,
The sensor is arranged in the opening in top view,
At least part of the periphery of the opening of the holding means is provided with a magnetic shielding rib at least partly facing the side surface of the heating coil,
The heating coil consists of a double annular first coil and a second coil,
The ferrite has a plurality of legs radially extending from the center,
The magnetic shield rib is fitted into the gap between the first coil and the second coil, the opening of the insulating means, and the gap between two adjacent legs among the plurality of legs. induction cooker. a top plate on which the cooking container is placed;
a heating coil disposed below the top plate for heating the cooking vessel;
holding means arranged below the heating coil and holding the heating coil;
protection means positioned above the heating coil;
and a sensor that detects the state of the cooking container,
the holding means has an opening,
The sensor is arranged in the opening in top view,
At least part of the periphery of the opening is provided with a magnetic shielding rib at least partly facing the side surface of the heating coil,
the top surface of the magnetic shield rib is located above the bottom surface of the protection means,
The induction heating cooker, wherein the magnetic shield rib has a bent portion that bends toward the protective means on the upper surface of the protective means.

Images