JP2009254564A - Rice cooking method for electric rice cooker and electric rice cooker used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compensate weak points on heating due to a heat insulation property by a heating element suited to automatic rice cooking and heat insulation and provided on the inner surface of a pot in an inexpensive pot having a single layer and made of non-conductive non-metal, to cook delicious rice without cooking irregularities or heat insulation irregularities and to keep the delicious rice warm. <P>SOLUTION: The electric rice cooker includes an electromagnetic induction heating source 6 including a heating element 4 provided at the pot 1 made of the non-conductive non-metal and a heating coil 5 provided on the side of a body 2 housing the pot 1, or a heater 8 wound around a heat radiation plate 7 facing the outer circumference of the prescribed area of the pot 1 in addition to it. When performing cooking and warming of rice, the heating element 4 of the electromagnetic induction heating source 6 cooks rice by performing heating from a plurality of prescribed areas including the prescribed partial area of the inner surface of the pot 1 at least. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a heating source comprising a heating element provided in a pan made of non-conductive non-metal such as a clay pot, and a heating coil provided on a main body side that accommodates the pot and inducing the heat generation of the heating element by an alternating magnetic field, Or in addition to this, it is related with the electric rice cooker which equips with the heater wound around the outer periphery of the heat sink facing the outer periphery of the predetermined area | region of a pan, and performs rice cooking or heat retention.

  A heating element provided in the central area and the peripheral area of the outer surface of the bottom of the pot made of non-conductive nonmetal such as a clay pot, and heating that is provided on the main body side that accommodates the pot and induces heat generation by an alternating magnetic field. An electric rice cooker that includes a coil, a heating source, a heater wound around the outside of the heat sink facing the outside of the body region of the pan, and that cooks rice and keeps warm is already known (for example, Patent Documents 1 and 2). reference.).

  Moreover, although it is not non-conductive, the electric rice cooker which cooks rice and heat-retains using the heat generating body which generate | occur | produces with the alternating magnetic field from a heating coil with a nonmetallic pan is already known (for example, refer patent document 3). ). The electric rice cooker disclosed in Patent Document 3 is a non-metallic pan, which is a moderately conductive material cut out from a sintered body obtained by condensing high carbon-containing powder particles such as coke at a high temperature of 1000 to 3000 ° C. And a ceramic outer layer body in which a ceramic precursor is placed on the outer layer surface and fixed by sintering. As a result, the container main body is tightened from the outside by the ceramic outer layer body and has sufficient resistance against breakage, and the heating coil provided on the main body side accommodating the pan corresponding to the bottom central region and the peripheral region of the pan The container body that forms the inner surface of the pan is heated by the alternating magnetic field from, and the rice can be cooked or kept warm by directly heating water and rice or rice.

In addition, for cooking in a non-conductive non-metallic pan, there are also known earthen pans and heating cooking containers in which a heating element is provided on the entire inner surface of the bottom so as to generate heat by an alternating magnetic field from a heating coil ( For example, see Patent Documents 4 and 5.)
JP 2007-244558 A JP 2007-260324 A JP 2007-44255 A JP 2007-135635 A JP 2007-260213 A

  By the way, non-conductive non-metallic pans such as clay pots disclosed in Patent Documents 1, 2, 4, and 5 have extremely low thermal conductivity, and clay clay pots are as small as 1/200 of aluminum and thick, so that heat storage is possible. Well, it has the characteristic that it can easily generate heat, and when it is used by heating it directly by direct fire, it is easy to cook rice deliciously and has good heat retention after cooking. On the other hand, like a pot used in an electric rice cooker as disclosed in Patent Documents 1 and 2, heat is likely to escape at the top when keeping warm, and the side portion side is made thicker than the bottom side of the pan. For those that have improved heat storage and improved heat retention at the top of the pan, just take out the pan after cooking rice and place it on a table with a non-metallic lid, and keep it warm enough not only during meals I was able to eat rice deliciously. Such a feature cannot be obtained at all with a relatively thin metal pan as described in Patent Document 1. In addition, Patent Documents 1 and 2 make use of the fact that they can be maintained when they reach a high heat storage property on the side side, which is thicker than the bottom of a non-metallic pan, and the control temperature of rice cooking or heat insulation. A technique is also disclosed in which a heater is wound around the outer peripheral surface of the heat radiating plate facing the inner periphery of the interior case of the main body, and the thick portion of the pan is radiantly heated to ensure the control temperature for rice cooking and heat retention.

  However, in the electric rice cookers disclosed in Patent Documents 1 and 2, the heating efficiency during cooking and heat retention is low due to the low thermal conductivity of the pot, and the cooking time tends to be long, and the interior case of the main body also has heat resistance Necessary. Moreover, because of the relationship of heating and heating by heating the heating elements and heaters provided in specific areas on the outer surface of the pan unique to rice cooking and conducting heat inside the pan, Uneven temperature in each part of the pan from time to time, such as the temperature rise on the side that is the thick part of the pan is more likely to be delayed compared to the target control temperature or the detected temperature of the pan that is the basis for temperature control. This is likely to cause uneven cooking.

  Since the earthenware pot disclosed in Patent Document 4 and the cooking container disclosed in Patent Document 5 are provided with a heating element on the inner surface of the bottom portion to generate heat, the heating efficiency is high and the heat retention is good, so the heat efficiency is high and energy saving can be achieved. However, although it is suitable for cooking methods such as direct-fire heating, it is a structure and form that is not suitable for an electric rice cooker that automatically cooks with energization control or shifts to heat retention after rice cooking. In addition, there is no disclosure or suggestion of a technique for taking advantage of the above-described advantages in an electric rice cooker.

  The container body disclosed in Patent Document 3 is a non-metallic conductor, but exhibits a dielectric action that generates heat due to an alternating magnetic field from a heating coil, and is practically used for an electric rice cooker, together with reinforcement from the outside. It is said that it can cook rice and keep warm by heating evenly and efficiently with heat efficiency, but as a rice cooker, from a sintered body coagulated with high carbon content powder particles such as coke at a high temperature of 1000 to 3000 ° C Because it uses a machined container body with moderate conductivity and dielectric properties, and a ceramic outer layer body that has a ceramic precursor placed on the outer layer surface and fixed by sintering, The cost is high.

  The object of the present invention is to compensate for the weak point to heat by the heat insulation by a non-conductive non-metallic pan with a single layer, compensated by a heating element provided on the inner surface of the pan suitable for automatic rice cooking and heat insulation, cooking unevenness and heat insulation An object of the present invention is to provide a method of cooking an electric rice cooker that can cook more delicious rice without unevenness and keep it more delicious, and an electric rice cooker used therefor.

  In order to achieve the above object, the rice cooking method of the electric rice cooker of the present invention includes a heating element obtained by coating a non-conducting non-metallic pan with a heating paste material paste and firing, and a main body containing the cooking pot. A heating coil provided on the side for inductively heating the heating element by an alternating magnetic field, or an electromagnetic induction heating source, or in addition to this, a heater wound around the outside of the heat sink facing the outside of the predetermined area of the pan, In the rice cooking method of an electric rice cooker that performs rice cooking and heat retention, the heating element of the electric induction heating source performs rice cooking by heating from a predetermined plurality of areas including at least a predetermined partial area of the inner surface of the pan. It is said.

  In such a configuration, heating with a non-conducting non-metallic pan and heating of a heating element provided in a plurality of areas is performed by generating heat with an alternating magnetic field from a heating coil provided on the main body side housing the pan. Depending on the number of heating elements in one or more predetermined areas set on the inner surface of the pan, direct heating to compensate for the low thermal conductivity of the pan, or promotion of convection by vigorous foaming, While achieving at a position suitable for rice cooking and heat retention, the heat generator on the inner surface of the pan tends to overheat after the water runs out. It can be done by dropping or turning it off, etc., and cooking can be completed and kept warm by cooperating with a pan outer surface heating element or a heater around the pan, or by heating alone.

  In such a method, a non-conducting non-metallic pan is coated with a heating paste material paste and baked, and a heating element provided on the main body housing the pan causes induction heating of the heating element by an alternating magnetic field. In an electric rice cooker that includes a heating coil, an electromagnetic induction heating source comprising a heating coil, or a heater wound around the outside of a heat sink facing the outside of a predetermined area of the pan, The heating element is realized by an electric rice cooker characterized by being provided in a predetermined plurality of areas including at least a predetermined partial area on the inner surface of the pan.

  In the above method, the heating element may be further heated from the central region and the peripheral region of the bottom of the inner surface of the pan, and the heater may be heated from a position facing the body of the pan.

  In such a configuration, in addition to the above, in addition to the above, direct heating that compensates for the low thermal conductivity of the pan is suitable for rice cooking for each partial area in the central area and the peripheral area of the bottom of the inner surface of the pot, and Satisfactory conditions can be obtained, and without any cooperation with the outer surface heating element, convection is promoted by active foaming, and uniform heating can be performed with high heating efficiency and heat efficiency.

  For this purpose, the heating element may be provided in the central area and the peripheral area of the bottom of the inner surface of the pan, and when the heater is provided at a position opposite to the body of the pan, this is used as a main for heat insulation as before. The problem of overheating caused by heating with the inner surface heating element can be solved by using in cooperation with the heater on the lid side.

  In the above method, the heating element is further heated from the central area and the peripheral area of the bottom part of the outer surface of the pan and the corner area between the central area and the peripheral area of the inner surface of the pot, and the heater is a body part of the pan. It heats from the position which opposes to, It can be made into the characteristic.

  In such a configuration, in addition to the above, in addition to the conventional heating from the heating element provided in the central area and the peripheral area of the bottom of the outer surface of the pan, the heat generation between the central area and the peripheral area of the inner surface of the pot The body can compensate for the lack of heating by the outer surface heating element by direct heating that compensates for the low thermal conductivity of the pan, while promoting the convection due to the generation of local bubbles to eliminate uneven heating.

  In the electric rice cooker, the heating element may be further coated with a water-repellent paint or a releasable paint.

  In such a configuration, in addition to the above, depending on the water-repellent paint, the influence of water penetration can be prevented, and it can be replaced by a glaze applied to the surface to prevent water penetration and leakage of the clay pot itself. Further, depending on the releasable paint, it is possible to prevent the rice grains and the like from sticking. However, the coating of the water repellent paint does not require a protective layer when the heating element 5 is embedded in the wall of the pan 1, and is an intermediate feature between the case where the inner surface of the pan is provided and the case where it is provided on the outer surface. Will have.

  In the electric rice cooker, the heating coil and the heating element may be provided in a range facing each other.

  In such a configuration, in addition to the above, in addition to the above, the heating element can change the area and thickness for each installation area to adjust the heat generation amount and heat generation area, but each heating coil that generates heat with an alternating magnetic field is individually provided. By facing each other, the heating conditions at each time can be controlled differently.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

  According to the electric rice cooker and the rice cooking method of the present invention, according to the number of heating elements provided in a predetermined partial area set one or more on the inner surface of a non-conductive non-metallic pan in a single layer, Direct heating that compensates for the low thermal conductivity of the pan and promotion of convection by vigorous foaming are achieved at a position suitable for rice cooking and heat insulation, heating efficiency, heat efficiency, uniform heating and even early cooking It is easy to cope with the fact that the internal heating element of the pan tends to generate excessive heat after the time when water is exhausted, and the on-time ratio is controlled with high resolution to sufficiently reduce the heat generation amount or turn it off. Steamed rice can be finished and kept warm with proper heating without burning, in cooperation with a pan outer surface heating element or a heater around the pan, or by independent use.

  Hereinafter, an embodiment of an electric rice cooker according to the present invention will be described in detail with reference to FIGS. 1 and 2 to provide an understanding of the present invention. In addition, the following description is a specific example of this invention, Comprising: The content of description of a claim is not limited.

  The electric rice cooker according to the present embodiment includes a non-conductive non-metallic pan 1 such as an earthen pan and a main body 2 that is housed so that the pan 1 can be attached and detached, as in the examples individually shown in FIGS. A lid 3 that opens and closes the main body 2 and the pan 1, a heating element 4 provided in the pan 1, and a heating source 6 that is provided on the side of the main body 2 and includes a heating coil 5 that induces heat generation by an alternating magnetic field. In addition to this, a heater 8 wound around the outside of the heat radiating plate 7 facing the outside of the predetermined region of the pan 1 is provided, for example, high-frequency energization via the IGBT element to the heating coil 5 is performed, and the temperature of the pan 1 is set. Rice cooking or rice cooking as one of the cooking modes set by inverter control based on temperature information from the temperature sensor 9 representatively shown in FIG. 1 to be detected or by applying current control to the heater 8 to this. And keep warm.

  The non-conducting non-metallic pan 1 may be mainly made by firing porcelain clay, but also includes ceramics and various known ones can be adopted. The heating element 4 of the heating source 6 is a conductive layer that generates heat by generating an eddy current by an alternating magnetic field from the heating coil 5, and is applied by printing a silver paste of about 10 to several tens μm provided on the outer surface of the pan 1. It may be a layer, a laminated layer of silver foil, a silver deposition layer, an embedded layer, or the like. However, the conductive material and the layer formation method can be freely selected.

  As already described, the non-metallic pan 1 has excellent heat retention but low thermal conductivity. In order to make use of this characteristic for both cooking and heat insulation, the present applicant increases the heat storage property by making the side 1b side thicker than the bottom 1a side of the pan 1 and improves the heat retention at the top of the pan 1. Even if you just take out the pan after cooking rice and put it on a table with a non-metallic lid, you can keep warm enough during meals and eat rice deliciously. . In addition, using the fact that the heat storage on the side 2 side, which is thicker than the bottom 1 side of the non-metallic pan 1, can also be maintained when it reaches the control temperature of rice cooking and heat retention, 1, a heater 8 is wrapped around the outer peripheral surface of the radiator plate 7 facing the inner periphery of the interior case 2 a of the main body 2, the temperature of the thick portion of the pan 1 is radiantly heated to compensate for the outer surface of the pan 1. Has previously proposed a technique for securing the control temperature for rice cooking and heat insulation in cooperation with the heating elements 4a and 4b provided in the central area and the peripheral area of the bottom of the rice.

  However, due to the low thermal conductivity of the pan 1, the heating efficiency during rice cooking and heat retention is low, the rice cooking time tends to be long, and the interior case 2a of the main body 2 also needs heat resistance. In addition, the heating elements 4a, 4b and the heater 8 provided in specific areas on the outer surface of the pan 1 unique to rice cooking generate heat and conduct heat to the inside of the pan 1 to perform rice cooking and heat retention. During the temperature operation, the temperature rise on the side part, which is the thick part of the pan 1, is more likely to be delayed than the control temperature that is the target for control or the temperature detected by the pan that is the basis for temperature control. It is easy to cause uneven cooking by experiencing uneven temperature in each part of the pan.

  To cope with this, in the present embodiment, first, as in each example shown individually in FIGS. 1 and 2, the heating element 4 of the electric induction heating source is at least a predetermined partial area on the inner surface of the pan 1. The rice is cooked by heating from a plurality of predetermined areas. According to this, it is made to heat with the alternating magnetic field from the heating coil 5 provided in the main body 2 side which accommodates the pan 1 of the heating element 4 which provided the rice cooking and heat retention in the non-conductive non-metallic pan 1 in several areas. Depending on the number of heating elements 4 provided in one or more predetermined partial areas set on the inner surface of the pan 1, direct heating to compensate for the low thermal conductivity of the pan 1 or active foaming The on / off duty ratio is controlled with high resolution for the fact that the pan inner surface heating element 4 is likely to overheat after the time when water runs out, while promoting convection by means of rice cooking and heat insulation. The heat generated is reduced or turned off, and the steamed rice is properly cooked and kept warm in cooperation with the heating element 4 on the outer surface of the pan and the heater 8 around the pan 1 or used alone. Can be performed by heating.

  Therefore, depending on the number of heating elements 4 provided in a predetermined partial area set in one or more on the inner surface of the non-conductive non-metallic pan 1 which is a single layer and inexpensive, the low thermal conductivity of the pan 1 is reduced. When direct heating to supplement and promotion of convection by vigorous bubbling are achieved at a position suitable for rice cooking and heat insulation, when cooking rice is advanced uniformly and evenly with heating efficiency, heat efficiency, and water disappears Afterwards, it is easy to overheat the inner surface heating element 4 of the pan by controlling the on-time ratio with high resolution to sufficiently reduce the amount of heat generation, or to turn it off easily. Can be achieved by proper heating without burning, in cooperation with the outer heating element 4 of the pot outer surface, the heater 8 around the pot 1 or the like, or alone.

  Here, the on / off inverter control resolution of the heating coil 5 can be on the order of 0.1 sec in high-frequency application control via an IGBT element, but in the experiment, water disappears with a resolution setting of about 1.5 sec. After cooking, the rice cooking was completed through the steaming process, or the problems such as local heating and scorching could be solved when performing fine heating to keep warm.

  In order to carry out the above rice cooking method, the electric rice cooker is a non-conducting non-metallic pan 1 coated with a heating paste material paste and fired, and the main body 2 side housing the pan 1. A heating coil 5 for induction heating of the heating element 4 by an alternating magnetic field, or an electromagnetic induction heating source 6 comprising this, or in addition to this, a heater wound around the outside of the heat radiating plate 7 facing outside the predetermined area of the pan 1 8, the heating element 4 of the electric induction heating source 6 is realized as being provided in a predetermined plurality of areas including at least a predetermined partial area of the inner surface of the pan 1. .

  Here, in the present embodiment, as in the example shown in FIG. 1, the heating element 4 includes heating elements 4 a and 4 b provided in the center area and the peripheral area of the bottom of the outer surface of the pot 1, and the inner surface of the pot 1. Heating is performed from the heating element 4 c provided in the corner area between the central area and the peripheral area, and the heater 8 is heated from a position facing the body of the pot 1. Thereby, in addition to the above, in addition to the conventional heating from the heating elements 4a, 4b provided in the central area and the peripheral area of the bottom of the outer surface of the pan 1, the space between the central area and the peripheral area of the inner surface of the pot 1 The heating by the heating element 4c of the pot 1 compensates for the lack of heating by the outer heating elements 4a, 4b by direct heating to compensate for the low thermal conductivity of the pot 1, while the convection as shown by the arrows in the figure due to the generation of local bubbles 11 Uneven heating can be eliminated by promoting the process. In order to realize this, the heating elements 4a and 4c are both arranged in a plane area at the bottom of the pan 1, and are opposed to the heating coil 5a disposed in the plane area below the bottom of the pot 1 so as to face the electromagnetic induction heating source 6a. The heating element 4b is opposed to the heating coil 5b and serves as an electromagnetic induction heating source 6b.

  In this way, duty ratio control of on / off can be individually controlled in units of the electromagnetic induction heating sources 6a and 6b. In the electromagnetic induction heating source 6a, the arrangement position, heat generation area, thickness, etc. in units of the heating elements 4a and 4c, etc. Accordingly, the heat generation position, the heat generation area, and the heat generation amount per unit area with respect to the alternating magnetic field of the same strength from the heating coil 5a can be varied. But even if it is the same heat generating body 4a-4c, content of a heat-emitting component can be changed by changing thickness partially etc., and the emitted-heat amount can also be varied partially. Further, even in the same heating coils 5a and 5b, the alternating magnetic field intensity extending to the same heating elements 4a to 4c facing each other can be partially changed by partially changing the coil density. However, the heating elements 4a and 4b can also be opposed to the individual heating coils 5 to constitute individual electromagnetic induction heating sources 6.

  In the present embodiment, separately from the above, as in the example shown in FIG. 2, the heating element 4 is heated from the heating elements 4 d and 4 e provided in the central area and the peripheral area of the bottom of the inner surface of the pan 1. The heater 8 can be heated from a position facing the body of the pan 1. Thereby, in addition to the above, the direct heating that compensates for the low thermal conductivity of the pan 1 is performed by the heating elements 4d and 4e provided in the central region and the peripheral region of the bottom of the inner surface of the pan 1 for each partial region. In addition, conditions that are suitable and sufficient for cooking rice can be obtained, and without any cooperation with the outer surface heating element, convection is promoted by active foaming, and uniform heating can be performed with high heating efficiency and heat efficiency. Thus, although the heat generating body 4 is provided in the center area | region and peripheral area of the bottom part of the inner surface of the pan 1, if the heater 8 is provided in the position facing the trunk | drum of the pan 1, this will heat-retain as usual. The inner heating element 4d is used in cooperation with the heating via the inner lid 15 from the heater 14 provided on the heat radiating plate 13 on the lid 3 side, which is representatively shown in the example of FIG. The problem of overheating due to heating at 4e can be solved.

  If the outer heating element of the pan 1 is eliminated as in this example, the PPS etc. of the inner case 2a of the main body 2 required for providing the heating elements 4a and 4b on the outer surface of the pot 1 as in the example of FIG. The heat-resistant resin or the ceramic heat-resistant plate 16 on the upper surface of the bottom portion is not necessary, and there is an advantage that the cost can be reduced accordingly.

  Also in the case of this example, the heating sources 6c and 6b where the heating elements 4d and 4e and the heating coils 5a and 5b individually face each other, individually adjusting the heating amount for each heating element 4d and 6d, the heating position and heating zone for each heating element 4d and 4e, Individual adjustment of heat generation amount, adjustment of partial heat generation amount for each of the heating elements 4d and 4e, adjustment of alternating magnetic field strength for each of the heating coils 5a and 5b, and adjustment of partial alternating magnetic field strength for each of the heating coils 5a and 5b it can.

  In any case, the electromagnetic induction heating source 6 in which the heating element 4 and the heating coil 5 are opposed to each other is individually arranged by setting the heat generation condition for each arrangement position and adjusting according to the elapsed time of heat generation. In between.

  Further, the heating element 4 is coated with a water repellent paint or a release paint. Depending on the water-repellent paint, the influence of water permeation can be prevented, and it is essential regardless of the inner and outer surfaces of the pot 1. Such a water-repellent paint can be replaced by a glaze applied to the surface in order to prevent water penetration and leakage of the clay pot itself. Further, depending on the releasable paint, it is possible to prevent the rice grains and the like from sticking, and it is effective as essential for the heating elements 4c, 4d and 4e provided on the inner surface of the pan 1.

  Here, the heat conductivity of the non-conductive non-metallic pan 1 is low and unsuitable for heating from the outer surface heating element, and the heat storage is utilized to cope with the lack of heat at the top during heat retention, and In order to ensure the strength at the time of dropping, if a suitable example is shown, in a normal earthenware pot, the mainstream is a uniform thickness of about 10 to 15 mm. For the pan 1 made and sealed with a glass-based glaze, a sufficient drop resistance was obtained with a thickness on the bottom 1a side of about 3-4 mm and a thickness on the side 1b of about 7-8 mm. In addition, cooked rice by uniform heating and uniform heat insulation could be realized. From such a dimensional relationship, the difference in thickness between the bottom 1a side and the side 1b side of the pan 1 can be approximately doubled.

  Furthermore, the opening part of the pan 1 is made thick from the side part, for example to the inner side. Thereby, although the opening part of the pan 1 is easily affected by the outside air due to the lid closing structure, the temperature tends to decrease, but the heat storage capacity increases due to the increase in thickness from the side part of the opening part, and the heat during cooking is stored. Thus, it is possible to suppress a decrease in temperature due to the outside air, and it is possible to prevent the occurrence of condensation due to a temperature difference even at the start of heat retention immediately after cooking rice with a lot of moisture. If such a thickness increase is too large, it takes too much time to raise the temperature, so it is preferably less than 6 mm. If it is too small, a heat storage effect cannot be obtained, so it is preferable to set it to about 3 mm or more.

  The present invention is practically used in an electric rice cooker employing a non-conductive non-metallic pan with a single layer, and a heating element provided on the inner surface of the pan suitable for automatic rice cooking and heat retention with a weak point to heating due to heat insulation of the pan Compensate with, cook more delicious rice without uneven cooking and warming, and keep warm more delicious.

It is sectional drawing of the half part which shows the 1st example of the electric rice cooker which concerns on embodiment of this invention. It is principal part sectional drawing of the half part which shows the 2nd example of the electric rice cooker which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pan 2 Main body 2a Interior case 3 Cover body 4, 4a, 4b, 4c, 4d, 4e Heating element 5, 5a, 5b Heating coil 6, 6a, 6b, 6c, 6d Heating source 7 Radiating plate 8, 14 Heater 9 Temperature Sensor

Claims (8)

An electromagnetic comprising: a heating element coated with a material paste of a heating element on a pan made of non-conductive non-metal and baked; and a heating coil provided on the main body side that accommodates the pot to cause the heating element to generate heat by an alternating magnetic field. In the rice cooking method of an electric rice cooker, which comprises an induction heating source, or in addition to this, a heater wound around the outside of the heat sink facing the outside of the predetermined area of the pan,
A heating method of an electric rice cooker, wherein the heating element of the electric induction heating source performs cooking by heating from a predetermined plurality of areas including at least a predetermined partial area of the inner surface of the pan.   The heating element is heated from the central area and the peripheral area of the bottom of the inner surface of the pot, and the heater is heated from a position facing the trunk of the pot. Method.   The heating element is heated from the center area and the peripheral area at the bottom of the outer surface of the pan, and the corner area between the central area and the peripheral area of the inner surface of the pot, and the heater is heated from a position facing the body of the pot. The rice cooking method of the electric rice cooker of Claim 1 characterized by performing. An electromagnetic comprising: a heating element coated with a material paste of a heating element on a pan made of non-conductive non-metal and baked; and a heating coil provided on the main body side that accommodates the pot to cause the heating element to generate heat by an alternating magnetic field. In an electric rice cooker that is equipped with an induction heating source, or in addition to this, a heater wound around the outside of the heat sink facing the outside of the predetermined area of the pan, and for cooking rice and keeping warm,
An electric rice cooker characterized in that the heating element of the electric induction heating source is provided in a predetermined plurality of areas including at least a predetermined partial area of the inner surface of the pan.   5. The electric rice cooker according to claim 4, wherein the heating element is provided in a central region and a peripheral region of a bottom portion of the inner surface of the pan, and a heater is provided at a position facing the body portion of the pan.   The heating element is provided in the central area and the peripheral area of the bottom part of the outer surface of the pan, and the corner area between the central area and the peripheral area of the inner surface of the pot, and the heater is provided at a position facing the body part of the pan. The electric rice cooker of Claim 4 characterized by the above-mentioned.   The electric rice cooker according to any one of claims 4 to 6, wherein the heating element is coated with a water-repellent paint or a releasable paint.   The electric rice cooker according to any one of claims 4 to 8, wherein the heating coil and the heating element are provided in a range facing each other.

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