JP2008071771A - Induction heating cooking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that a conventional induction heating cooking device is inferior in thermal responsiveness, and can not be controlled correctly. <P>SOLUTION: In this induction heating cooking device, a top plate 22 for placing a cooking container 21, a heating coil 23 for generating an induction magnetic field for heating the cooking container, an infrared sensor 24 for detecting a temperature of the cooking container 21 via the top plate 22, and a heating control means 25 for driving and controlling high-frequency current of the heating coil 23 by a temperature information of the infrared ray sensor 24 are installed, and the temperature of the cooking container 21 is detected by overlapping a light reception sensitivity wavelength range of the infrared sensor 24 with an infrared transmission wavelength range of the top plate 22, thereby the temperature of the cooking container 21 is controlled with high responsiveness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an induction heating cooker used in general homes, offices, restaurants and the like.

  Conventionally, this type of induction heating cooker is provided with temperature detecting means on the lower surface of the top plate, and detects the bottom surface temperature of the cooking container to control the heating amount (see, for example, Patent Document 1). . This induction heating cooker will be described with reference to FIG. The top plate 2 on which the cooking container 1 is placed, the heating coil 3 disposed below the top plate 2, the temperature sensor 4 disposed below the top plate 2, and the heating coil 3 with high frequency An inverter circuit 5 that inducts and heats the cooking vessel 1 by passing an electric current, and a control means 6 that drives and controls the inverter circuit 5 so that the temperature detected by the temperature sensor 4 becomes a set temperature.

  When a power supply or operation switch (not shown) is pressed to start heating, the inverter circuit 5 is operated by a signal from the control means 6 to generate a high-frequency magnetic field from the heating coil 3. The cooking vessel 1 is heated by this high frequency magnetic field, and the temperature rises. When the temperature detected by the temperature sensor 4 is lower than the set temperature when a predetermined time has elapsed after the heating operation by the heating coil 3 is started, the control means 6 lowers the heating output or changes the set temperature to be lower. In this way, in this induction heating cooker, the heating amount is controlled according to the temperature detected by the temperature sensor 4 after a predetermined time has elapsed since the start of heating.

  In this induction heating cooker, a temperature sensor 4 is provided below the top plate 2 to detect the temperature of the cooking container 1 heated via the top plate made of a glass material. Due to the low thermal conductivity of the top plate 2 and the presence of heat capacity, there is a temperature difference between the temperature detected by the temperature sensor 4 and the temperature of the cooking vessel 1. Particularly in recent years, in induction heating cookers, the amount of heating power has been increased to about 2.5 kW to 3 kW, and thus the temperature difference has become larger.

And when the pan with the warp on the bottom of the cooking container is heated, the temperature difference tends to increase, and the temperature change cannot be detected properly in a timely manner due to the low responsiveness of the temperature sensor. A delay is likely to occur in the temperature control of the container.
Japanese Patent Laid-Open No. 11-87043

  In view of the problems of the above-described conventional induction overheating cooker, the problem to be solved by the present invention is an induction heating cooker capable of temperature control with good thermal responsiveness without causing a delay in temperature control for the cooking container to be heated. Is to provide.

  The present invention is provided with an infrared sensor for detecting the temperature of the cooking container via a top plate, and a heating control means for controlling the amount of heating power based on temperature information of the infrared sensor, and the infrared sensor has a wavelength range of light receiving sensitivity. This is an induction heating cooker that overlaps the infrared transmission wavelength region of the top plate.

As a result, the temperature of the bottom surface of the cooking container placed on the top plate can be detected with high sensitivity by an infrared sensor, and the temperature of the cooking container can be detected without delay even when the heating capacity increases, and temperature control is ensured. Is something that can be done.

  As mentioned above, the induction heating cooker of this invention can detect the temperature of the heated cooking container with sufficient responsiveness, and can control the temperature of a cooking container appropriately.

  1st invention is a cooking container which heats a cooking thing, the top plate which mounts the said cooking container, the induction heating means which heats a cooking container via the said top plate, and a cooking container via the said top plate An infrared sensor for detecting the temperature of the light source, and a heating control means for controlling the heating power supplied to the induction heating means according to temperature information of the infrared sensor. In an induction heating cooker that overlaps the wavelength range, the infrared sensor can detect the temperature of the cooking container with good responsiveness, and the heating control means can appropriately control the temperature of the cooking container based on this detection.

  The second invention is an induction heating cooker in which the light receiving sensitivity wavelength of the infrared sensor in the first invention is set within the infrared transmission wavelength region of the top plate, and the temperature of the cooking container is detected by reducing the temperature effect of the top plate. it can.

  The third invention is an induction heating cooker in which the top plate of the first or second invention is configured to increase the infrared transmittance to the visual field range of the infrared sensor. The sensor can accurately detect the temperature of the cooking container.

  4th invention is the induction heating cooking appliance which provided the reflectance reduction means according to the visual field range of an infrared sensor in the top plate described in either of 1st to 3rd invention, and the reflectance of a top plate By reducing the temperature and improving the infrared transmittance, the temperature influence of the top plate is reduced, and the infrared sensor can accurately detect the temperature of the cooking container.

  5th invention is the induction heating cooking which provided the character part, such as a character and a pattern, in order to raise the infrared rays transmittance | permeability to the visual field range of an infrared sensor in the top plate in any one of 1st to 4th invention By reducing the temperature effect of the top plate, the infrared sensor can accurately detect the temperature of the cooking container.

  6th invention is the induction heating cooking appliance which provided the visual field range display means which shows the visual field range of an infrared sensor in the top plate described in any one of the 1st-5th invention, and the visual field of the infrared sensor of a top plate. When the part corresponding to the range becomes dirty, the user is alerted and can be easily cleaned so that the temperature of the cooking container can be accurately detected.

  7th invention is the induction heating cooking appliance which provided the coloring part which shows the visual field range of an infrared sensor in the top plate described in any one of the 1st-6th invention, and is in the visual field range of the infrared sensor of a top plate. When the corresponding part becomes dirty, the user is alerted and can be easily cleaned so that the temperature of the cooking container can be accurately detected.

  The eighth invention is the induction heating cooker described in any one of the first to seventh inventions, wherein the boiling in the cooking container is detected from the temperature change amount based on the differential value obtained from the output of the infrared sensor. Since the boiling detection means is provided and the heating control means controls the heating power based on the output of the boiling detection means, the temperature of the cooking container can be reliably detected without being affected by the difference in the infrared transmittance of the top plate and dirt.

Since the induction heating cooker of the present invention can achieve the object of the present invention by using the above-described configurations of the first to eighth inventions as the main part of the embodiment, each of the claims corresponding to each claim will be described below. Details of the embodiment will be described with reference to the drawings to explain the embodiment. In addition, the part which attached | subjected the same code | symbol in each figure has the same structure and effect, The overlapping detailed description is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a configuration diagram illustrating an induction heating cooker according to Embodiment 1 of the present invention. A cooking container 21 for heating the cooked food, a top plate 22 made of a magnetic material on which the cooking container 21 is placed, and a heating coil 23 as induction heating means for generating an induction magnetic field to heat the cooking container 21; An infrared sensor 24 comprising a photodiode for detecting the temperature of the cooking vessel 21 via the top plate 22 and a heating control for driving and controlling the high-frequency current of the heating coil 23 via an inverter circuit according to the temperature information of the infrared sensor 24 Means 25.

  In particular, in the present embodiment, the temperature of the cooking vessel 21 is detected so that there is no response delay by overlapping the band of the light receiving sensitivity wavelength of the infrared sensor 24 with the infrared transmission wavelength band of the top plate 22.

  The top plate 22 is formed of a lithia ceramic material, and the infrared transmittance is such that a wavelength of 2.5 μm or less is well transmitted and a wavelength of 2.5 μm to 4 μm is transmitted by several tens of percent. Moreover, 4 μm or more is hardly transmitted.

  The infrared sensor 24 is composed of a photodiode, and the band of the light receiving sensitivity wavelength is about 0.7 μm to about 2.7 μm. The infrared sensor 24 uses a photodiode, but a PIN photodiode can perform the same operation. And although the infrared sensor 24 is provided in the center part of the mounting part of the cooking vessel 21 of the top plate 22, what is necessary is just to be able to detect the temperature of the cooking vessel 21, and is not restricted to the structure of a present Example. In addition, a plurality of infrared sensors 24 may be provided to detect the temperature of the cooking container 21 so that the temperature distribution of the cooking container 21 can be detected to control the temperature of the cooking container 21 with higher accuracy. .

  In the above embodiment, when a power supply (not shown) is turned on and a predetermined heating amount is set with the operation switch, the heating control means 25 supplies a high-frequency current to the heating coil 23. When a high frequency current is supplied to the heating coil 23, an induction magnetic field is generated from the heating coil 23, and the cooking vessel 21 placed on the top plate 22 is induction heated. Due to this induction heating, the temperature of the cooking vessel 21 rises and the object to be heated in the cooking vessel 21 is cooked. At this time, the heating control means 25 can grasp the progress of cooking of the object to be heated based on the temperature information from the infrared sensor 24, and adjusts the power supplied to the heating coil 23 according to the progress of cooking. . Thus, the food to be cooked in the cooking container 21 is cooked.

  In particular, the infrared sensor 24 is constituted by an infrared sensor composed of a photodiode, detects thermal energy radiated from the bottom surface of the cooking vessel 21 that is transmitted through the top plate 22, and determines the amount of light that is the thermal energy as current or voltage. The temperature of the cooking vessel 21 is calculated by changing to As described above, since the infrared sensor 24 is not in contact with the bottom surface of the cooking container 21 and detects and calculates the temperature of the cooking container 21, the responsiveness is fast and the temperature of the cooking container 21 can be accurately detected. It can be done. For this reason, the electric power control with respect to the heating coil 23 of the heating control means 24 can also be made to respond quickly to the temperature change of the cooking vessel 21.

The light receiving sensitivity wavelength band of the infrared sensor 24 overlaps with the infrared transmittance of the top plate 22, and can detect the bottom surface temperature of the cooking container 21 without delay by detecting the light energy radiated from the cooking container 21. is there. Therefore, the temperature of the bottom surface of the cooking container can be detected by the infrared sensor, and an induction heating cooker that can accurately control the temperature by detecting the bottom surface temperature of the cooking container is realized.

  As described above, according to the present embodiment, the temperature of the cooking container is detected so that the light receiving sensitivity wavelength range of the infrared sensor overlaps the transmission wavelength range of the top plate, and the temperature of the cooking container is responsive. Can be controlled.

(Embodiment 2)
FIG. 2 is a characteristic diagram of the infrared sensor employed in the induction heating cooker according to the second embodiment of the present invention. In the present embodiment, the configuration of the induction heating cooker is the same as that in FIG. 1 showing the first embodiment. The difference from the first embodiment is the light receiving sensitivity of the infrared sensor that detects the temperature of the cooking container. An infrared sensor 24 having a wavelength band within the infrared transmission wavelength range of the top plate 22 is provided to detect the temperature of the cooking vessel 21.

  The infrared sensor 24 is configured by an infrared sensor made of a photodiode, and detects thermal energy radiated from the bottom surface of the cooking vessel 21 that is transmitted through the top plate 22. The light receiving sensitivity wavelength band of the infrared sensor 24 is approximately 0.7 μm to approximately 2.4 μm, and a photodiode within the infrared transmission wavelength region of the top plate 22 is used.

  In the above embodiment, the temperature detection of the cooking vessel 21 and the heating control based thereon are the same as the operations described in the first embodiment. In particular, as shown in FIG. 2 in which the infrared sensor 24 shows the internal resistance on the vertical axis and the cut-off wavelength on the horizontal axis, when the cut-off wavelength, which is the light receiving sensitivity, of the photodiode being used becomes longer, the internal resistance It tends to be smaller.

  The resistance value of the internal resistance tends to be further reduced as the ambient temperature increases. When the ambient temperature is high, the output voltage is likely to fluctuate only when light energy is not incident. This internal resistance is proportional to the offset voltage of the operational amplifier that changes the light energy into current or voltage and the resistance value to be amplified for the operational amplifier, and the output is likely to fluctuate as the ambient temperature increases.

  The infrared sensor 24 is configured to shorten the cutoff wavelength, thereby increasing the internal resistance and reducing the influence of the offset voltage of the operational amplifier. In particular, the ambient temperature of the heating coil 23 is as high as about 100 ° C., and the temperature of the cooking vessel 21 can be detected stably by reducing the temperature effect of the internal resistance.

  As described above, according to the present embodiment, the temperature of the bottom surface of the cooking vessel 21 can be detected stably even when the ambient temperature increases by shortening the light receiving wavelength of the infrared sensor 24. An induction heating cooker capable of accurately detecting the bottom surface temperature of the cooking container 21 and controlling the temperature is realized.

(Embodiment 3)
FIG. 3 is an enlarged cross-sectional view of a main part of the induction heating cooker according to Embodiment 3 of the present invention. In the present embodiment, the configuration of the heating control circuit of the induction heating cooker is the same as in FIG. 1 showing the first embodiment, and the difference from the first embodiment is in the top plate.

  That is, the top plate 22 is configured to increase the infrared transmittance corresponding to the visual field range of the infrared sensor 24, so that the portion 22a corresponding to the visual field range of the infrared sensor 24 is not colored and printed on the outer periphery of the other portions. Colored plate upper print 26 and plate lower print 27 are printed on the upper and lower surfaces of the top plate 22.

With this configuration, the infrared transmittance of the portion 22a corresponding to the visual field range of the infrared sensor 24 of the top plate 22 is increased, the temperature effect of the top plate 22 is reduced, and the temperature of the cooking vessel 21 is accurately detected. It can be an induction heating cooker.

  The top plate 22 is made of a lithia ceramic material, is transparent or white, and in order to hide the heating coil 23 and the like in the induction heating cooker, the upper plate printing 26 and the lower plate printing are performed by black or silver colored printing. 27 is constituted. These printings are performed by screen printing or the like, and the thickness after firing is several μm to several tens of μm.

  In the above embodiment, the temperature detection of the cooking vessel 21 and the heating control based thereon are the same as the operations described in the first embodiment. The top plate 22 has a lower infrared transmittance due to the plate upper print 26 or the plate lower print 27 provided to prevent the inside of the induction heating cooker from being seen. When the transmittance of the top plate 22 decreases, the light energy incident on the infrared sensor 24 receives light energy emitted from the bottom surface temperature of the top plate 22 in addition to the light energy emitted from the bottom surface of the cooking vessel 21. Become.

  In order to accurately detect the bottom surface temperature of the cooking vessel 21, it is necessary to increase the infrared transmittance of the top plate 22. Therefore, in the present embodiment, the portion 22 a corresponding to the visual field range of the infrared sensor 24 is printed. Instead, the material of the top plate 22 is used as it is, and the infrared transmittance of the top plate 22 can be increased.

  As described above, according to the present embodiment, the top plate 22 is configured to increase the infrared transmittance of the portion corresponding to the visual field range of the infrared sensor 24, thereby reducing the temperature effect of the top plate 22. The induction heating cooker can accurately detect the temperature of the cooking vessel 21.

(Embodiment 4)
FIG. 4 is an enlarged cross-sectional view of a main part of an induction heating cooker according to Embodiment 4 of the present invention. In the present embodiment, the configuration of the heating control circuit of the induction heating cooker is the same as in FIG. 1 showing the first embodiment, and the difference from the first embodiment is in the top plate.

  That is, the top plate 22 is provided with an overcoat 28 such as a heat-resistant coating as a reflectance reducing means on the portion 22b corresponding to the visual field range of the infrared sensor 24 to reduce the reflectance of the top plate 22 and increase the infrared transmittance. It is set as the structure improved, and it is set as the induction heating cooking appliance which can detect the temperature of the cooking container 21 by reducing the temperature influence of the top plate 22 by this.

  In addition, since the plate lower printing 27 is covered with the overcoat 28, it is also applied to the portion 22b corresponding to the visual field range of the infrared sensor 24. Further, although the overcoat 28 is provided at the lower part of the top plate 22, the same effect can be obtained even if it is provided at the upper part of the top plate 22.

  In the above embodiment, the temperature detection of the cooking vessel 21 and the heating control based thereon are the same as the operations described in the first embodiment. The overcoat 28 is used to improve the heat resistance and wear resistance of the plate lower printing 27. The overcoat 28 can change the refractive index of the light transmitted through the plate lower printing 27, and the transmittance is improved by reducing the reflectance of the portion 22b corresponding to the visual field range of the infrared sensor 24 on the top plate 22. It can be done.

Further, the overcoat 28 can improve the transmittance by using a material suitable for the material of the plate lower printing 27. Further, the light energy radiated from the lower surface of the top plate 22 can be reduced, and the influence of the lower surface temperature of the top plate 22 can be reduced.

  That is, according to the present embodiment, the portion 22b corresponding to the visual field range of the infrared sensor 24 is provided with the overcoat 28 such as a heat-resistant coating, thereby reducing the reflectance of the top plate 22 and improving the infrared transmittance. The temperature effect of the top plate 22 is reduced, and the temperature of the cooking vessel 21 can be accurately detected.

(Embodiment 5)
FIG. 5 is a plan view showing an induction heating cooker according to Embodiment 5 of the present invention. In the present embodiment, the configuration of the induction heating cooker is the same as that of FIG. 1 showing the first embodiment, and the difference from the first embodiment is in the top plate.

  In other words, the top plate 22 is provided with a character portion 29 in which characters and pictures are formed in order to increase the infrared transmittance corresponding to the visual field range of the infrared sensor 24, thereby reducing the temperature effect of the top plate 22. Thus, the induction heating cooker can accurately detect the temperature of the cooking vessel 21.

  The character portion 29 is formed by printing on the upper portion of the top plate 22 and is formed by removing the print of the character portion. In addition, although the character part 29 has pulled out the printing of the character part in order to raise the infrared transmittance of the top plate 22, it is not restricted to this Embodiment, For example, it is not restricted to a design and the number of characters. . In the present embodiment, the character portion 29 is provided on the top of the top plate 22, but the same effect can be obtained even if it is provided on the bottom surface of the top plate 22.

  In the above embodiment, the temperature detection of the cooking vessel 21 and the heating control based thereon are the same as the operations described in the first embodiment. A character portion 29 to be colored and printed is formed on the top plate 22, and only the character portion is not printed, whereby the infrared transmittance can be improved. The improvement of the transmittance can be determined by the area ratio between the character portion and other portions. That is, the infrared transmittance of the top plate 22 can be increased and the design of the top plate 22 can be improved. Further, although the characters in the character part 29 are cut out by printing, the transmittance can be further improved as an inverted configuration.

  As described above, according to the present embodiment, the top plate is provided with the character portion 29 on which characters and designs are formed in order to increase the infrared transmittance to the visual field range of the infrared sensor 24, thereby reducing the temperature effect of the top plate. It can reduce, and it can be set as the induction heating cooking appliance which can detect the temperature of a cooking container correctly.

(Embodiment 6)
FIG. 6 is a plan view showing an induction heating cooker according to Embodiment 6 of the present invention. In the present embodiment, the configuration of the induction heating cooker is the same as that of FIG. 1 showing the first embodiment, and the difference from the first embodiment is in the top plate.

  That is, the top plate 22 has a configuration in which a field-of-view range printing 30 as a field-of-view range display means formed by ring-shaped printing is provided so as to indicate the field of view of the infrared sensor 24, and thereby the infrared sensor 24 on the top plate 22 When the inside of the visual field range 30 is dirty, the induction heating cooker is configured so that the user is alerted and can be easily cleaned so that the temperature of the cooking container 21 can be accurately detected.

  In the present embodiment, the field-of-view range printing 30 has a ring shape, but may be any shape that can indicate to the user that the field-of-view range of the infrared sensor, and is limited to the shape of the present embodiment. It is not something that can be done.

  In the above embodiment, the temperature detection of the cooking vessel 21 and the heating control based thereon are the same as the operations described in the first embodiment. The field-of-view range print 30 of the top plate 22 is a ring-shaped print so as to indicate the outer periphery of the field-of-view range of the infrared sensor 24, and the field-of-view range in the field-of-view range print 30 is not printed. The infrared transmittance of the top plate 22 can be kept high.

  When the inside of the visual field printing 30 becomes dirty, the transmittance of the top plate 22 decreases, which affects the temperature detection of the infrared sensor 24. Therefore, the user can recognize the cleaning position depending on whether or not the inside of the visual field range printing 30 is dirty. If it is dirty, the temperature of the infrared sensor 24 can be detected stably by performing cleaning such as wiping.

  As described above, according to the present embodiment, the top plate is provided with the field-of-view range printing 30 so as to indicate the field-of-view range of the infrared sensor 24, and when the top plate becomes dirty, the top plate is cleaned with attention. It is possible to accurately detect the temperature of the cooking container.

(Embodiment 7)
FIG. 7 is a plan view showing an induction heating cooker according to Embodiment 7 of the present invention. In the present embodiment, the configuration of the induction heating cooker is the same as that of FIG. 1 showing the first embodiment, and the difference from the first embodiment is in the top plate.

  That is, the top plate 22 has a configuration in which the colored portion 31 is provided so as to indicate the visual field range of the infrared sensor 24, and this alerts the user when the visual field range of the infrared sensor 24 on the top plate 22 becomes dirty. Thus, the induction cooking device can detect the temperature of the cooking container 21 accurately.

  The coloring part 31 is colored and printed in a silver color for the visual field range of the infrared sensor 24. In the present embodiment, the coloring portion 31 is colored in silver, but it is only necessary to indicate to the user that it is in the visual field range of the infrared sensor, and is limited to the color of the present embodiment. It is not a thing.

  In the above embodiment, the temperature detection of the cooking vessel 21 and the heating control based thereon are the same as the operations described in the first embodiment. Since the coloring portion 31 can visually determine the visual field range of the infrared sensor 24 on the top plate 22, when the coloring portion 31 becomes dirty, the user can easily perform caution ventilation for cleaning. For example, if the user can check the degree of contamination of the colored portion 31 before cooking and the cooking can be performed, the visual field range of the infrared sensor 24 can be cooked without contamination.

  As described above, in the present embodiment, the top plate is provided with the colored portion 31 so as to indicate the visual field range of the infrared sensor, so that when the colored portion 31 becomes dirty, it can be easily cleaned by alerting the user. And the induction heating cooking appliance which can detect the temperature of the cooking vessel 21 correctly is realizable.

(Embodiment 8)
FIG. 8 is a configuration diagram of an induction heating cooker according to the eighth embodiment of the present invention. In the present embodiment, the basic configuration of the induction heating cooker is the same as that in FIG. 1 showing the first embodiment, and the difference from the first embodiment is in the heating control method.

  In other words, the heating control means 25 obtains a differential value from the output of the infrared sensor 24 that detects the thermal energy that the cooking vessel 21 is heated by the heating coil 23 and radiates through the top plate 22, and the amount of temperature change based on this differential value. Is provided with a boiling detection means 32 for detecting boiling in the cooking container 21, and the heating power is controlled by the output of the boiling detection means 32, so that the cooking container is not easily affected by the difference in infrared transmittance of the top plate 22 or dirt. This is an induction heating cooker capable of detecting 21 temperatures.

  In the above embodiment, when heating of the cooking container 21 is started by the heating coil 23 by the heating control means 25, the temperature of the cooking container 21 rises and the temperature detected by the infrared sensor 24 also rises. In the case of boiling water, the temperature of the water in the cooking vessel 21 rises. When boiling, the temperature of the water in the cooking vessel 21 is saturated and the bottom temperature of the cooking vessel 21 is also saturated. That is, it is only necessary to detect a change in the bottom temperature of the cooking vessel 21 by boiling water, and boiling can be detected when the change is eliminated or reduced.

  When the top plate 22 is contaminated, the infrared transmittance of the top plate 22 is reduced, so that the light energy emitted from the cooking vessel 21 is reduced. The absolute temperature value of the cooking vessel 21 changes due to the decrease in light energy. That is, the boiling detection means 32 detects the boiling by the temperature change of the infrared sensor 24, and can detect the temperature change even if the light energy is reduced by the dirt of the top plate 22. As described above, even when the transmittance of the top plate 22 is changed or the transmittance due to dirt is changed, boiling in the cooking vessel 21 can be detected.

  As described above, in the present embodiment, the heating control means is provided with the boiling detection means 32 that detects the boiling in the cooking vessel 21 from the amount of temperature change based on the differential value obtained from the output of the infrared sensor 24, and this boiling Since the heating power is controlled based on the output of the detection means 32, it is possible to realize an induction heating cooker that can detect the temperature of the cooking vessel 21 without being affected by the difference in the transmittance of the top plate 22 and dirt.

  The induction heating cooker of the present invention can detect the temperature of the heated cooking container with good responsiveness, can appropriately control the temperature of the cooking container, and is applied to a heating cooker such as a bulb heating type, induction heating type, etc. it can.

The block diagram of the induction heating cooking appliance by Embodiment 1 of this invention Characteristic diagram of infrared sensor in induction heating cooker according to embodiment 2 The expanded sectional view of the principal part of the induction heating cooking appliance by the same Embodiment 3 The expanded sectional view of the principal part of the induction heating cooking appliance by Embodiment 4 Plan view of top plate of induction heating cooker according to embodiment 5 The top view of the top plate of the induction heating cooking appliance by Embodiment 6 Plan view of top plate of induction heating cooker according to embodiment 7 Configuration diagram of induction heating cooker according to embodiment 8 Configuration diagram of conventional induction heating cooker

Explanation of symbols

21 Cooking container 22 Top plate 23 Heating coil (induction heating means)
24 Infrared sensor 25 Heating control means 28 Overcoat (reflectance reduction means)
29 Character part 30 Field of view printing (Field of view display means)
31 Coloring section 32 Boiling detection means

Claims (8)

A cooking container for heating a cooking product, a top plate for placing the cooking container, induction heating means for heating the cooking container via the top plate, and the temperature of the cooking container heated via the top plate. An infrared sensor for detecting, and a heating control means for controlling heating power supplied to the induction heating means according to temperature information of the infrared sensor, wherein the infrared sensor has a light receiving sensitivity wavelength range as an infrared transmission wavelength range of the top plate. An induction heating cooker that overlaps. The induction heating cooker according to claim 1, wherein the infrared sensor has a light receiving sensitivity wavelength set in an infrared transmission wavelength region of the top plate. The induction heating cooker according to claim 1 or 2, wherein the top plate is configured to increase infrared transmittance to a visual field range of the infrared sensor. The induction heating cooker according to any one of claims 1 to 3, wherein the top plate is provided with reflectance reduction means corresponding to a visual field range of the infrared sensor. The induction heating cooker according to any one of claims 1 to 4, wherein the top plate is provided with a character portion such as a character or a picture in order to increase the infrared transmittance to the visual field range of the infrared sensor. The induction heating cooker according to any one of claims 1 to 5, wherein the top plate is provided with visual field range display means for indicating a visual field range of the infrared sensor. The induction heating cooker according to any one of claims 1 to 6, wherein the top plate is provided with a colored portion indicating a visual field range of the infrared sensor. 2. A boiling detection means for detecting boiling in a cooking container from a temperature change amount based on a differential value obtained from an output of an infrared sensor is provided, and the heating control means controls heating power by the output of the boiling detection means. The induction heating cooker described in any one of 1 to 7.

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