JP5239515B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker provided with an infrared sensor.

Conventionally, this type of induction heating cooker suppresses leakage of magnetic flux from the top plate on which the cooking container is placed, a heating coil provided below the placement unit, and a heating coil provided near the heating coil. A magnetic shielding member, an infrared sensor that receives infrared rays emitted from the cooking container on the top plate and outputs a detection signal corresponding to the amount of light, and a control circuit that controls the output of the heating coil based on the detection signals Some infrared sensors are arranged below the magnetic-shielding member (see, for example, Patent Document 1).

  The conventional induction heating cooker shown in FIG. 3 is provided with a top plate 3 on which the cooking container 2 is placed on the upper surface of the main body 1 that forms the outer shell, and the cooking container 2 is induction heated below the top plate 3. A heating coil 4 is provided. Ferrites 5 having magnetic collection are provided radially below the heating coil 4 to suppress downward magnetic flux. Moreover, the infrared sensor 6 is provided in the lower part of the top plate 3 applicable to the lower part of the cooking container 2, The infrared ray radiated | emitted from the bottom face of the cooking container 2 is detected through the top plate 3, and the signal according to temperature Is output. A control circuit 7 for controlling the output of the heating coil 4 based on a signal output from the infrared sensor 6 is provided below the infrared sensor 6. The control circuit 7 is disposed in a cooling air passage 11 formed between a partition plate 10 provided below the heating coil 4 and the bottom of the main body 1, and an IGBT, a resonance capacitor, etc. joined to a heat sink. The heat generating component 8 in the control circuit 7 is cooled to a desired temperature by the blower 9 provided in the main body 1. The heating coil 4 is attached to the upper surface of the coil base 13 containing the ferrite 5 by adhesion or the like, and the coil base 13 is interposed via a spacer 16 for forming a space between the upper surface of the heating coil 4 and the top plate 3. A spring 12 provided on the partition plate 10 is supported so as to be pressed against the lower surface of the top plate 4. The infrared sensor 6 is disposed below the ferrite 5 and above the partition plate 10. The infrared sensor 6 has a configuration in which the influence of magnetic flux is reduced by the magnetic shielding effect of the ferrite 5 but is covered with a magnetic shielding case 14 made of aluminum or the like having a magnetic shielding effect in order to eliminate the influence of magnetic flux leakage. ing. The infrared sensor 6 is heated by the influence of the heat generated in the heating coil 4 and the cooking container 2 and rises in temperature, so it is necessary to cool it to a desired temperature. Accordingly, the partition plate 10 is provided with a ventilation hole 15 in the vicinity of the infrared sensor 6, and a part of the cooling air flowing through the cooling air passage 11 passes through the ventilation hole 15 to cool the infrared sensor 6.

The induction heating cooker provided with the conventional infrared sensor can perform stable temperature detection by the infrared sensor without being affected by the leakage magnetic flux from the heating coil.
JP 2004-273303 A

  However, in the conventional configuration, since the infrared sensor 6 is surrounded by the magnetic shielding case 14 and the partition plate 10 is interposed between the infrared sensor 6 and the control circuit 7, the signal wiring for connecting the infrared sensor 6 and the control circuit 7 is used. There was a problem in assemblability, such as the complexity of routing.

  In addition, since the space of the infrared sensor 6 and the space of the control circuit 7 are configured separately with the partition plate 10 interposed therebetween, it is difficult to reduce the thickness and size of the entire product.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an induction heating cooker that has a simple configuration, good assemblability, is thin, and can save space.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention is provided on the upper surface of a main body, and a top plate on which a cooking container is placed, and heating that heats the cooking container provided on the lower portion of the top plate. A coil, an infrared sensor that is provided below the top plate and detects infrared rays emitted from the cooking container, a control circuit that controls the output of the heating coil in accordance with the output of the infrared sensor, and the heating coil And a magnetic shielding plate that supports the heating coil from below, and the infrared sensor and the control circuit are disposed below the magnetic shielding plate, and a heating zone at a position where the cooking container is placed is provided. A light emitting device to be displayed is provided below the top plate, and is configured by a portion excluding a coating portion that does not transmit light applied to the lower surface of the top plate. In the structure for the light emitting display the shape of the heating zone by transmitting light of said light emitting device to the light transmitting portion which was disposed the magnetic shield plate to site directed pairs to the light transmitting portion of the top plate.

  By arranging the infrared sensor and the control circuit in the same space as described above, inclusions between the infrared sensor and the control circuit can be reduced, so that the assembling property can be improved. In addition, a magnetic shield is used as a support member for the heating coil, and an infrared sensor and control circuit are placed underneath it, which simplifies the configuration, saves space, and enables reduction in thickness and size. Become.

In addition, the heating zone shape makes it easy for the user to understand the heating zone, and a magnetic shielding plate is placed in a position that is substantially opposite to the light transmission part of the top plate, thereby preventing disturbance light incident from the top plate. Since the influence of disturbance light on the infrared sensor below the magnetic shield plate can be reduced by blocking with the plate, stable temperature detection becomes possible.

  The induction heating cooker of the present invention has a simple configuration and good assemblability, and can make the entire product thinner and smaller.

In addition, the heating zone shape makes it easy for the user to understand the heating zone, and a magnetic shielding plate is placed in a position that is substantially opposite to the light transmission part of the top plate, thereby preventing disturbance light incident from the top plate. Since the influence of disturbance light on the infrared sensor below the magnetic shield plate can be reduced by blocking with the plate, stable temperature detection becomes possible.

1st invention is provided in the upper surface of a main body, the top plate which mounts a cooking container, the heating coil which is provided in the lower part of the top plate and heats the cooking container, and the cooking which is provided in the lower part of the top plate An infrared sensor for detecting infrared radiation emitted from the container; a control circuit for controlling the output of the heating coil in accordance with the output of the infrared sensor; and suppressing leakage of magnetic flux from the heating coil and the heating coil from below. The infrared sensor and the control circuit are disposed below the magnetic shield plate, and a light emitting device that displays a heating zone at a position where the cooking container is placed is provided below the top plate. The light from the light emitting device is applied to the light transmitting portion formed on the lower surface of the top plate except the painted portion that does not transmit the light. In the structure for the light emitting display the shape of the heating zone whereby bulk, by arranging the magnetic shield plate at a site against countercurrent to the light transmitting portion of the top plate, inclusions between the infrared sensor and the control circuit As a result, it is possible to improve the assemblability, and the magnetic shield is used as a support member for the heating coil, and the infrared sensor and the control circuit are arranged below it. Thus, the space can be saved, and the thickness can be reduced and the size can be reduced.

In addition, the heating zone shape makes it easy for the user to understand the heating zone, and a magnetic shielding plate is placed in a position that is substantially opposite to the light transmission part of the top plate, thereby preventing disturbance light incident from the top plate. Since the influence of disturbance light on the infrared sensor below the magnetic shield plate can be reduced by blocking with the plate, stable temperature detection becomes possible.

  In the second invention, in particular, the end face of the cylinder can be brought close to the vicinity of the infrared sensor by providing the cylinder penetrating the magnetic shielding plate between the infrared sensor of the first invention and the top plate. Therefore, the influence of disturbance light from the periphery of the infrared sensor can be suppressed, and the degree of freedom of arrangement of the infrared sensor in the vertical direction is increased, so that the assemblability can be easily optimized.

In the third invention, in particular, the disturbance light incident from the top plate is absorbed by the magnetic shielding plate by performing the light absorbing treatment on the surface of the magnetic shielding plate of the first invention facing the top plate. This further enhances the light blocking effect and enables more stable temperature detection.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

( Reference form 1)
FIG. 1 is a cross-sectional view illustrating a configuration of an induction heating cooker according to a first reference embodiment of the present invention.

  A top plate 23 on which the cooking container 22 is placed is provided on the upper surface of the main body 21 forming the outer shell, and a heating coil 24 for inductively heating the cooking container 22 is provided below the top plate 23. Ferrites 25 having magnetic collection are provided radially below the heating coil 24 to suppress downward magnetic flux. In addition, an infrared sensor 26 is provided at the lower portion of the top plate 23 corresponding to the lower portion of the cooking vessel 22, and infrared signals emitted from the bottom surface of the cooking vessel 22 are detected through the top plate 23 to generate a signal corresponding to the temperature. Output. A control circuit 27 that controls the output of the heating coil 24 based on a signal output from the infrared sensor 26 is provided in the vicinity of the infrared sensor 26. The infrared sensor 26 and the control circuit 27 are disposed below the ferrite 25, and the influence of magnetic flux is reduced by the magnetic-shielding effect of the ferrite 25. In order to eliminate the influence of magnetic flux leakage, aluminum having a magnetic-shielding effect is further provided. A magnetic shielding plate 28 made of, for example, is provided so as to partition the space on the heating coil 24 side and the space on the infrared sensor 26 and control circuit 27 side. The heating coil 24 is attached to the upper surface of the coil base 29 containing the ferrite 25 by adhesion or the like, and the heat from the heated cooking vessel 22 to the heating coil 24 is between the heating coil 24 and the top plate 23. A heat insulating material 30 made of ceramic fiber or the like for reducing the influence is provided. The magnetic shield plate 28 supports the heating coil 24 from below via a coil base 29 and is biased upward by a spring 31 provided at the bottom of the main body 21, thereby causing the heating coil 24 to be attached to the top plate 23. It is provided so as to be pressed through the heat insulating material 30 toward the lower surface. The space between the magnetic shield plate 28 and the bottom of the main body 21 forms a cooling air passage 33, such as an IGBT or a resonance capacitor joined to a heat sink disposed in the cooling air passage 33. The heat generating component 38 and the infrared sensor 26 in the control circuit 27 are cooled to a desired temperature by the cooling air from the blower 32 provided in the main body 21. A cylindrical body 34 made of aluminum, resin, or the like is provided between the infrared sensor 26 and the top plate 23 so as to penetrate the magnetic shield plate 29. The cylindrical body 34 is integrated with a casing 35 that covers and holds the infrared sensor 26, and the casing 35 is fixed to the lower surface of the magnetic shield plate 26.

Induction heating cooker shown in this reference embodiment, it is possible to suppress the leakage of magnetic flux from heating coil 24 has a configuration having a magnetic shield plate 28 for supporting the heating coil 24 from below, infrared radiation emitted from the cooking container 22 The control circuit 27 for controlling the output of the heating coil 24 in accordance with the output of the infrared sensor 26 and the output of the infrared sensor 26 is disposed below the magnetic shield plate 28. Since the infrared sensor 26 and the control circuit 27 are arranged in the same space in this way, there is almost no inclusion between the infrared sensor 26 and the control circuit 27, so that the space between the infrared sensor 26 and the control board 27 is eliminated. Assembling can be improved, such as easy wiring. Further, since the magnetic shield 28 is used as a support member for the heating coil 24, and the infrared sensor 26 and the control circuit 27 are disposed below it, the configuration can be simplified and space can be saved, and the entire product is thin. And miniaturization are possible. In the present embodiment, by providing the cylindrical body 34 that penetrates the magnetic shield plate 28 between the infrared sensor 26 and the top plate 23, the end face of the cylindrical body 34 can be brought close to the vicinity of the infrared sensor 26. . Therefore, the light that enters the vicinity of the infrared sensor 26 from the outside can be largely blocked, and the instability of the output of the infrared sensor 26 due to the influence of disturbance light can be suppressed. In addition, since the end face of the cylindrical body 34 can be brought close to the vicinity of the infrared sensor 26 with this configuration, the degree of freedom in arranging the infrared sensor 26 in the vertical direction is increased, and it is possible to arrange it in a place that is easier to assemble. As a result, it is easy to optimize assembly.

In this reference embodiment, although the tubular body 34 has a continuous integral construction with the upper and lower magnetic shielding plate 28, for example it may be a split configurable in the upper and lower magnetic shielding plate 28. Thus, the desired effect can be obtained if the continuous holes are formed above and below the magnetic shield 28.

(Embodiment 1 )
FIG. 2 is a plan external view of the induction heating cooker according to the first embodiment of the present invention as seen from above. Since the basic configuration is the same as that of the reference embodiment 1, the description thereof is omitted, and different points will be mainly described. Further, the same components as those in FIG. 1 of the reference embodiment 1 are denoted by the same reference numerals.

In FIG. 2, the top plate 23 is provided with four heating zones 35 for placing the cooking container and an operation / display unit 36 for heating operation and display at the front. At the bottom of each of the heating zones being supported by heating coil as described in Reference Embodiment 1 (not shown) is magnetically shielded plate 28 (indicated by broken lines in the figure). In the present embodiment, in order to make the heating zone 35 easily understandable to the user, a circular light emitting device (not shown) using LEDs or the like is mounted on the lower portion of the top plate 23, and the top plate In this configuration, light is emitted in a circular shape through 23 light transmission portions 37. In addition, the portion other than the light transmitting portion 37 on the lower surface of the top plate 23 is subjected to a treatment that does not transmit light by painting or the like. The magnetic shield plate 28 is provided so as to cover a portion substantially facing the light transmitting portion 37. As described above, in the present embodiment, the magnetic shielding plate 28 is disposed at a portion substantially opposite to the light transmitting portion of the top plate 23, so that the disturbance light incident from the top plate 23 is blocked by the magnetic shielding plate 28. Since the influence of disturbance light on the infrared sensor 26 below 28 can be reduced, stable temperature detection is possible. In addition to the above configuration, when light absorbing treatment such as black coating is applied to the surface of the magnetic shield 28 facing the top plate 23, ambient light incident from the top plate 23 is absorbed by the magnetic shield 28. Therefore, the effect of blocking ambient light is further enhanced, and more stable temperature detection is possible.

  In the present embodiment, the light transmitting portion 37 is a circular light emitting portion, but it is obvious that the shape, position and purpose of the light transmitting portion 37 are not limited to this.

  As described above, the induction cooking device according to the present invention improves the performance and assemblability of equipment using an infrared sensor, and can be applied to any device having an infrared sensor.

Sectional drawing which shows the structure of the induction heating cooking appliance in the reference form 1 of this invention Plane external view seen from the upper side of the induction heating cooking appliance in Embodiment 1 of this invention Sectional drawing which shows the structure of the conventional induction heating cooking appliance

DESCRIPTION OF SYMBOLS 21 Main body 22 Cooking container 23 Top plate 24 Heating coil 26 Infrared sensor 27 Control circuit 28 Magnetic-shield board 34 Cylindrical body 37 Light transmission part

Claims (3)

A top plate provided on the upper surface of the main body for placing the cooking vessel, a heating coil provided at the lower portion of the top plate for heating the cooking vessel, and an infrared ray provided at the lower portion of the top plate and emitted from the cooking vessel. An infrared sensor for detecting the output, a control circuit for controlling the output of the heating coil in accordance with the output of the infrared sensor, and a magnetic shield for suppressing magnetic flux leakage from the heating coil and supporting the heating coil from below. The infrared sensor and the control circuit are disposed below the magnetic shield, and a light emitting device for displaying a heating zone at a position where the cooking container is placed is provided below the top plate, and is provided on a lower surface of the top plate. By transmitting the light of the light emitting device to the light transmitting portion constituted by the portion excluding the painted portion that does not transmit the applied light. In the structure for the light emitting display the shape of the heat zone, the induction heating cooker arranging the magnetic-shield plate at a site against countercurrent to the light transmitting portion of the top plate. The induction heating cooker of Claim 1 which provided the cylinder which penetrates the said magnetic-shield board between the said infrared sensor and the said top plate. The induction heating cooker according to claim 1 , wherein a surface of the magnetic shielding plate facing the top plate is subjected to a light absorption treatment.

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