JP5359010B2 - Electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of an inner pot having heating elements in the bottom and a curved part of the inner pot of an electromagnetic induction heating electric rice cooker, wherein it is difficult to set (transcribe or screen-print) a wide curved part heating element in the inner pot curved part if the angle of inclination of the outer surface is large. <P>SOLUTION: In the electromagnetic induction heating electric rice cooker, the curved part is disposed between the bottom and a side surrounding part, and the inner pot having the heating elements disposed in the bottom and in the curved part respectively is used. The range of the bottom 31 of the inner pot is approximately 1/2 of the outer diameter of the side surrounding part 33 of the inner pot. The curved part 32 of the inner pot is formed approximately in a circular shape in the range of a horizontal distance part from the outer end of the bottom 31 to the side surrounding part 33 of the inner pot and a part of approximately the same height as the horizontal distance, so that the angle of inclination of the curved part 32 can be made small (gentle), and therefore, the wide curved part heating element 36 can be easily set in the curved part 32 of the inner pot. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electric rice cooker in which an inner pot accommodated in a rice cooker body is heated by electromagnetic induction, and more particularly to an electric rice cooker using a non-metallic material (mainly a ceramic pot) as an inner pot. Is.

  This type of electromagnetic induction heating rice cooker is called a so-called IH rice cooker, in which the inner pot is put in and out freely in the inner case of the rice cooker body, while the electromagnetic induction is in the bottom of the inner case. A heating coil (work coil) is provided to heat the inner pot by electromagnetic induction.

  In this way, when using a clay pot for the inner pot of the IH rice cooker, the rate of temperature rise during cooking is relatively gentle and the heat storage property of the inner pot is good, so rice can be cooked deliciously in recent years. IH rice cookers using clay pots are attracting attention.

  In an IH rice cooker using an earthenware pot as an inner pot, in order to heat the inner pot (earthenware pot), a heating element made of a heat generating material is attached (or applied) to the bottom of the inner pot, and the heating element is used as a work coil. It is performed by electromagnetic induction heating with a magnetic field from.

  By the way, this applicant has already proposed what is shown by Unexamined-Japanese-Patent No. 2007-244648 as an example of IH rice cooker using this kind of clay pot (patent document 1).

  In this known electric rice cooker, as shown in FIG. 4, an inner pot 3 made of a clay pot is accommodated in an inner case 14 of the rice cooker body 1. The inner pot 3 uses a curved portion 32 that is a curved portion between a bottom portion 31 that is a horizontal portion and a side peripheral portion 33 that is a vertical portion. In addition, a circular annular hill 34 is formed on the outer peripheral portion of the inner pot bottom 31 (boundary portion with the inner pot curved portion 32). The curved portion 32 of the inner pot 3 is substantially formed from the outer end portion of the hill 34 toward the outer surface of the inner pan side peripheral portion 33.

  By the way, in what used the earthenware pot for the inner pot 3, since heat conductivity is bad, it is desired to heat the widest possible area part of the inner pot lower part at the time of rice cooking. That is, when only the bottom 31 of the inner pot 3 is heated at the time of rice cooking, for example, since the thermal conductivity is poor in the clay pot, the heating temperature difference between the inner pot bottom 31 and the vicinity of the inner pot curved portion 32 becomes large, and the inner pot 3 Unevenness occurs in cooking rice.

  Therefore, in the known example of the electric rice cooker of FIG. 4, the bottom heating element 35 is provided on the inner pot bottom 31, while the bending portion heating element 36 is provided on the inner pot bending portion 32. On the other hand, a bottom work coil 41 and a bending part work coil 42 are installed at positions facing the bottom heating element 35 and the bending part heating element 36, respectively.

  And the electric rice cooker of the well-known example shown in FIG. 4 electromagnetically heats each heat generating body 35 and 36 with the magnetic field from each work coil 41 and 42 at the time of rice cooking, and the bottom part 31 of the inner pot (earthen pot) 3 and Each of the curved portions 32 is heated.

  By the way, in the electric rice cooker of this well-known example, the thing shown in FIG. That is, in this inner pot 3 (FIG. 5), the area (diameter d1) of the bottom part 31 which is the main subject of heating at the time of rice cooking is considerably larger than the outer diameter d0 of the inner pot side peripheral part 33 (d1 / d0 = About 64%). Accordingly, the horizontal width d2 of the inner pan curved portion 32 (substantially the horizontal distance from the outer end portion of the hill 34 to the outer surface of the upper end portion of the inner pan side peripheral portion 33) is outside the inner pan side peripheral portion 33. It is about 14% of the diameter d0. Moreover, the height h1 of the inner pot curved portion 32 is formed in a range that is the same as or slightly higher than the minimum amount of cooked rice (height) h2 when cooked. In the example of FIG. 5, the ratio of the horizontal width d2 and the height h1 in the inner pan curved portion 32 is about 1: 1.8, and the lower end and upper end of the outer surface of the curved portion 32 at this time The inclination angle a connecting the parts is about 61 °. Further, on the outer surface of the inner pot bending portion 32, a bending portion heating element 36 is installed in a range m (FIG. 5) from the lower end portion of the bending portion to a predetermined height position. The inclination angle b of the outer surface of the curved portion in the installation range is about 56 °.

  And the bottom part heating element 35 and the bending part heating element 36 are respectively affixed (or applied) to the bottom part 31 and the bending part 32 of the inner pot 3, and as the bottom heating element 35 and the bending part heating element 36, respectively. In recent years, silver paste, which is a heat generating material, is used in a very thin state (or coated). Each of the heating elements 35 and 36 is installed, for example, by transferring from the transfer paper 5 coated with silver paste 36 'as shown in FIG. 6, or by applying silver paste through a screen sheet (stencil) by screen printing. Is done.

JP 2007-244648 A

  By the way, in order to install the heating elements 35 and 36 in the inner pot 3, since the lower surface (heating element installation surface) of the inner pot bottom 31 is flat with respect to the inner pot bottom 31, the transfer paper described above is used. The base sheet (transfer sheet or screen sheet) can be stretched relatively easily and accurately (cleanly) on the lower surface of the inner pot bottom 31 by either the silver paste transfer method 5 or the silver paste application method by screen printing. The bottom heating element (silver paste) 35 can be installed (pasted or applied) relatively easily, but when the bending part heating element 36 is installed (pasted or applied) to the bending part 32, There were such difficulties.

  That is, the inclination angle b (b = about 56 °) of the heating element installation surface in the inner pot curved portion 32 is quite steep, while the transfer paper and the screen sheet for screen printing are flexible but in a flat state. is there. For example, when the silver paste 36 ′ is transferred with the transfer paper 5 shown in FIG. 6, the transfer paper 5 is moved along the outer surface of the inner pot curved portion 32 as shown by a chain line in FIG. 6 (reference numeral 5 ′). Although it is bent and covered with a curved surface, an excess portion is formed in the circumferential direction of the portion near the outer periphery of the transfer paper 5 ′, and the excess portion tends to become wrinkles. The wrinkles that are likely to occur near the outer periphery of the sheet are more likely to occur as the inclination angle of the inner pan curved portion 32 (angle b in FIGS. 5 and 6) becomes steeper, and the heating element width m ( The larger the width of FIG. In addition, when the application | coating part of the silver paste 36 'in the transfer paper 5 becomes wrinkles, the silver paste of the wrinkled part cannot be transferred well to the curved surface, and the amount of heat generating material (silver paste) varies. Therefore, when the base sheet is stretched on the inner pot bending portion 32, it is necessary to carefully stretch the sheet of the bending portion covering portion, which is very troublesome.

  Thus, in the inner pot 3 used for the electric rice cooker of the well-known example shown in FIGS. 4-6, the outer surface length (horizontal width d2 and height) of the curved part 32 in which the curved part heating element 36 is installed. Although the length of the range of h1 is considerably large, when the width m of the bending portion heating element 36 is increased, the outer surface of the bending portion 32 is steeply inclined. Therefore, as described above, the heating material (silver paste) At present, it is performed with a width m in the limit of the range where wrinkles are difficult to occur because uniform transfer (or printing) is difficult.

  Therefore, in the known example of the electric rice cooker of FIGS. 4 to 6, the inner pot bottom 31 is provided with a relatively large area bottom heating element 35, and the inner pot bending section 32 has a relatively small width M bending section heating element 36. Because the inner pan bottom 31 has a large amount of heat generation, the inner pan curved portion 32 is considered to be insufficient in heat generation, and the pan bottom is heated uniformly from a wide area (cook delicious rice). There was room for improvement against this goal.

  Further, as shown in FIG. 5, the horizontal width d2 of the inner pot bending portion 32 is narrow, and an attempt is made to install a wide bending portion heating element 36 on the bending portion 32 (the amount of heat from the bending portion 32). The upper end side of the curved portion heating element 36 needs to be extended upward, and in this case, the upper end of the curved portion heating element 36 has a minimum cooking rice height h2 (the height of the cooked cooked rice). ), The upper end portion of the curved portion heating element 36 may be heated to a height portion that does not require heating when cooking with the minimum amount of rice cooking (wasteful power consumption).

  Then, this invention can make the curved part heating element installed in the curved part of an inner pot wider, in the electromagnetic induction heating type electric rice cooker which uses the thing (earthen pot) made from a nonmetallic material for an inner pot. The purpose of this is to make it easier to install the bending portion heating element.

  The present invention has the following configuration as means for solving the above conventional problems. The present invention is directed to an electromagnetic induction heating type electric rice cooker (so-called IH rice cooker).

[Invention of Claim 1 of the Present Application]
The invention of claim 1 is configured to accommodate the inner pot made of non-metallic material rice cooker body, a curved surface portion between the side periphery of the bottom and the vertical portion comprising a horizontal portion on the inner pot using what is provided a curved portion, respectively to the inside bottom of the pan section and the inner bowl bending portion provided bottom heating element and the curved portion heating element which generates heat by electromagnetic induction, and the bottom heating element to the cooker body and a curved portion heating element are only set a work coil for electromagnetic induction heating, the range of the inner pan bottom portion with a size of about 1/2 of the outer diameter of the inner pan side peripheral portion, said inner bowl curved portion A horizontal distance portion from the outer end of the inner pot bottom to the inner pot side peripheral portion and a substantially arc-shaped range in the range of the horizontal distance and the horizontal distance are formed, and the area of the curved heating element is defined as the bottom heat generation. While set to more than twice the area of the body, the area per area of the bottom heating element An electric rice cooker in which the amount of heat material is larger than the amount of heat generating material per area of the curved portion heating element, wherein the bottom heating element has a thin portion and a thick portion. On the other hand, the curved portion heating element is characterized by being configured to have a constant thickness throughout .

The inner pot used in the electric rice cooker of the invention of claim 1 is made of ceramic called a clay pot, but the inner pot made of ceramic has a poor thermal conductivity as compared with a metal pot. It is. Therefore, in an electric rice cooker using an earthenware pot as the inner pot, it is preferable to heat from a wide area of the lower part of the inner pot in order to uniformly heat the inner pot during rice cooking.

  On the other hand, the bottom heating element and the bending part heating element provided at the bottom and the bending part of the inner pot are, in recent years, the silver paste, which is a heat generating material, transferred by transfer paper, or the silver paste is applied by screen printing. It is often used to install.

  By the way, in order to install each heating element in the inner pot, since the lower surface (heating element installation surface) of the inner pot bottom is flat with respect to the inner pot bottom, the silver paste transfer method using the transfer paper described above However, even with the silver paste application method by screen printing, the base sheet (transfer sheet or screen sheet) can be easily and accurately (cleanly) stretched to the bottom surface of the inner pot bottom, Therefore, since the inner pot curved portion is inclined in a curved surface state, it is difficult to neatly stretch the base sheet (transfer sheet or screen sheet). That is, for the inner pot bending portion, when the base sheet is placed on the outer surface of the inner pot bending portion, an extra portion is formed in the circumferential direction of the portion near the outer periphery of the base sheet, and the extra portion becomes a bowl. It becomes easy to become, and the work of extending the work is troublesome. In particular, the larger the inclination angle of the heating element installation surface in the inner pot bending portion (inclination angle with respect to the inner pot bottom), the easier it is to make wrinkles on the outer periphery of the base sheet. If the silver paste is transferred or screen-printed in a state where wrinkles are formed on the base sheet, the installation amount of the silver paste varies.

Therefore, in the electric rice cooker according to the first aspect of the present invention , as described above, the range of the inner pot bottom is set to be approximately half the outer diameter of the inner pot side peripheral portion, and the inner pot curved portion is the inner pot bottom portion. The overall width of the curved portion of the inner pot is increased by forming a substantially arc shape in the range of the horizontal distance portion from the outer end to the peripheral portion of the inner pot and the height portion substantially the same as the horizontal distance. At the same time, the inclination angle of the inner pot curved portion is made smaller (loosened).

  As described above, when the entire width of the inner pot bending portion is increased and the inclination angle of the inner pot bending portion is decreased (sloppy), the bending portion heating element (silver paste) installed therein is transferred by a transfer paper or screen. When applying by printing, it becomes difficult to make wrinkles when the base sheet (transfer sheet or screen sheet) is stretched along the inner pot curved portion.

  In addition, if the inclination angle of the inner pot curved portion is small (gradual), it is difficult to make wrinkles when the base sheet is stretched, so the width of the base sheet stretched on the inner pan curved portion should be widened. As a result, the bending portion heating element can be installed wide. In addition, when a curved part heating element is installed in a wide manner in this way, the lower part of the inner pot can be heated in a well-balanced manner from a wide area part in cooperation with the bottom heating element.

Moreover, in the same electric rice cooker, the area of the said curved part heating element is set to 2 times or more with respect to the area of a bottom heating element in that case.

In this way, when the area of the curved portion heating element is set to be twice or more than the area of the bottom heating element, the heating element can be provided in a wide area range near the outer periphery of the inner pot lower portion (inner pot curved portion). The heating balance between the bottom heating element and the curved heating element can be appropriately allocated.

In addition, in that case, the amount of the heat generating material per area of the bottom heat generating element is set larger than the amount of the heat generating material per area of the curved heat generating element.

In the inner pot of the electric rice cooker of the present invention, the area ratio of the bottom portion of the inner pot is smaller than the conventional one as described above, and the area of the bottom heating element installed on the bottom of the inner pot is inevitably. Although it becomes small, the bottom heating element is the main for heating during cooking. The heat generation amount per unit area of the heating element is proportional to the amount of heat generating material per unit area (amount of silver).

Therefore, as described above, when the amount of the heat generating material per area of the bottom heating element is larger than the amount of the heat generating material per area of the curved heating element, the area of the bottom heating element is reduced as described above. However, the calorific value per unit area at the bottom heating element portion increases, and the calorific value at the bottom heating element portion during rice cooking can be sufficiently secured.

By the way, the heat generation amount of the bottom heat generating element is basically proportional to the amount of heat generating material in the same portion. Therefore, if the thickness of the heating element is uniform throughout, each part generates heat uniformly, but when viewed as a whole, heat dissipation is possible and there is less heat dissipation than the radially outer peripheral side with a wide heating area. As a result, the amount of heat is concentrated on the radially inner peripheral side (center side) where the heating area is narrow, and the temperature tends to increase, resulting in heating unevenness in the inner and outer directions of the inner pot bottom.

Therefore, in the electric rice cooker according to the present invention, the bottom heating element does not have a constant thickness as a whole, but is composed of a thin wall portion and a thick wall portion, so that the calorific value distribution itself in the radial direction can be obtained. In other words, the non-uniformity of the heat quantity and temperature distribution that cause the heating unevenness as described above is eliminated.

On the other hand, the amount of the heat generating material per unit area is smaller than the amount of the heat generating material of the bottom heat generating element, and the area where the area is twice or more is larger than the thickness of the heat generating element. It has a constant wall thickness. And thereby, the balance of the heating amount with the bottom heating element is improved as described above, and the convection in the inner pot at the time of cooking is prevented from being displaced to the outer peripheral side of the inner pot, and the curvature of the inner pot The curved portion heating element can be easily and satisfactorily installed on the surface.

[Invention of claim 2 of the present application]
The invention of claim 2 of the present application accommodates an inner pan made of a non-metallic material in the rice cooker body, and forms a curved surface portion between the bottom portion which becomes a horizontal portion and the side peripheral portion which becomes a vertical portion in the inner pan. A bottom heating element and a bending part heating element that generate heat by electromagnetic induction are provided on the inner pot bottom and the inner pot bending part, respectively, and the bottom heating element is provided in the rice cooker body. And a work coil that electromagnetically heats each of the bending portion heating elements, the range of the bottom portion of the inner pot is approximately half the outer diameter of the inner pot side peripheral portion, and the inner pot bending portion is A horizontal distance part from the outer end of the inner pot bottom to the inner pot side peripheral part and a substantially arc-shaped range in the range of the horizontal distance and the same part as the horizontal distance, and the area of the curved heating element is defined as the bottom heating element Is set to be at least twice as large as the area of the bottom heating element An electric rice cooker in which the amount of the heat material is made larger than the amount of the heat generating material per area of the curved heating element, and a hill is provided on the outer periphery of the bottom of the inner pot, and the bottom heating element is It is characterized in that it is provided over the entire area excluding a part of the central part from the vicinity of the inner end of the hill .

The inner pot used in the electric rice cooker according to the invention of claim 2 is made of ceramic called a clay pot, but the inner pot made of ceramic has a poor thermal conductivity compared to a metal pot. It is. Therefore, in an electric rice cooker using an earthenware pot as the inner pot, it is preferable to heat from a wide area of the lower part of the inner pot in order to uniformly heat the inner pot during rice cooking.

On the other hand, the bottom heating element and the bending part heating element provided at the bottom and the bending part of the inner pot are, in recent years, the silver paste, which is a heat generating material, transferred by transfer paper, or the silver paste is applied by screen printing. It is often used to install.

By the way, in order to install each heating element in the inner pot, since the lower surface (heating element installation surface) of the inner pot bottom is flat with respect to the inner pot bottom, the silver paste transfer method using the transfer paper described above However, even with the silver paste application method by screen printing, the base sheet (transfer sheet or screen sheet) can be easily and accurately (cleanly) stretched to the bottom surface of the inner pot bottom, Therefore, since the inner pot curved portion is inclined in a curved surface state, it is difficult to neatly stretch the base sheet (transfer sheet or screen sheet). That is, for the inner pot bending portion, when the base sheet is placed on the outer surface of the inner pot bending portion, an extra portion is formed in the circumferential direction of the portion near the outer periphery of the base sheet, and the extra portion becomes a bowl. It becomes easy to become, and the work of extending the work is troublesome. In particular, the larger the inclination angle of the heating element installation surface in the inner pot bending portion (inclination angle with respect to the inner pot bottom), the easier it is to make wrinkles on the outer periphery of the base sheet. If the silver paste is transferred or screen-printed in a state where wrinkles are formed on the base sheet, the installation amount of the silver paste varies.

Therefore, in the electric rice cooker of the present invention, the range of the inner pot bottom is set to be approximately half the outer diameter of the inner pot side periphery, and the inner pot curved portion extends from the outer end of the inner pot bottom to the inner pot side periphery. In the range of the horizontal distance portion up to and the horizontal distance portion and substantially the same height portion, the overall width of the inner pot bending portion is increased, and the inclination angle of the inner pot bending portion is increased. It is small (loose).

As described above, when the entire width of the inner pot bending portion is increased and the inclination angle of the inner pot bending portion is decreased (sloppy), the bending portion heating element (silver paste) installed therein is transferred by a transfer paper or screen. When applying by printing, it becomes difficult to make wrinkles when the base sheet (transfer sheet or screen sheet) is stretched along the inner pot curved portion.

Moreover, in the same electric rice cooker, the area of the said curved part heating element is set to 2 times or more with respect to the area of a bottom heating element in that case.

In this way, when the area of the curved portion heating element is set to be twice or more than the area of the bottom heating element, the heating element can be provided in a wide area range near the outer periphery of the inner pot lower portion (inner pot curved portion). The heating balance between the bottom heating element and the curved heating element can be appropriately allocated.

In addition, in that case, the amount of the heat generating material per area of the bottom heat generating element is set larger than the amount of the heat generating material per area of the curved heat generating element.

In the inner pot of the electric rice cooker of the present invention, the area ratio of the bottom portion of the inner pot is smaller than the conventional one as described above, and the area of the bottom heating element installed on the bottom of the inner pot is inevitably. Although it becomes small, the bottom heating element is the main for heating during cooking. The heat generation amount per unit area of the heating element is proportional to the amount of heat generating material per unit area (amount of silver).

Therefore, as described above, when the amount of the heat generating material per area of the bottom heating element is larger than the amount of the heat generating material per area of the curved heating element, the area of the bottom heating element is reduced as described above. However, the calorific value per unit area at the bottom heating element portion increases, and the calorific value at the bottom heating element portion during rice cooking can be sufficiently secured.

By the way, as mentioned above, in the electric rice cooker of this invention, while making the range of the said inner pot bottom part into about 1/2 size of the outer diameter of an inner pot side peripheral part, an inner pot curved part is made into the inner pot bottom part. A horizontal distance part from the outer end to the inner pan side peripheral part and a range of the same height part as the horizontal distance are formed in a substantially arc shape, and the area of the curved part heating element with respect to the area of the bottom heating element It is set to 2 times or more.

As a result, the area ratio of the bottom of the inner pot is also smaller than that of the conventional inner pot, and the area of the bottom heating element installed at the bottom of the inner pot is also reduced.

However, the heating of the inner pot during rice cooking is centered on the bottom heating element.

For this reason, in the electric rice cooker according to the present invention, as described above, the amount of heat generation material per area of the bottom heating element is larger than the amount of heat generation material per area of the bending portion heating element, and the necessary heat generation amount To ensure.

However, since a hill is provided on the outer periphery of the bottom of the inner pan, the bottom heating element in that case should be provided over the entire area excluding a part of the central portion from the vicinity of the inner end of the hill. ing.

And thereby, the heating area relatively secures the necessary amount of heat generation at the bottom of the inner pot, and realizes good rice cooking performance.

[Effect of the invention of claim 1 of the present application]
In the electric rice cooker according to the first aspect of the present invention, the range of the inner pot bottom is set to be approximately half the outer diameter of the inner pot side peripheral portion, and the inner pot curved portion extends from the outer end of the inner pot bottom to the inner pot side. Since it is formed in a substantially arc shape in the range of the horizontal distance portion to the peripheral portion and the height portion substantially the same as the horizontal distance, the following effects are obtained.

  First, since the entire inner pan curved portion has a large width and the inner pan curved portion has a small (loose) inclination angle, the curved portion heating element (silver paste) installed therein is transferred by transfer paper or applied by screen printing. When the base sheet (transfer sheet or screen sheet) is stretched along the inner pot curved portion, it becomes difficult to wrinkle, and it is easy to install the curved portion heating element (silver paste). There is an effect of becoming.

  In addition, if the inclination angle of the inner pot curved portion is small (loose), it is difficult to make wrinkles when the base sheet is stretched, so the width of the base sheet stretched on the inner pot curved portion can be widened. As a result, there is an effect that the bending portion heating element can be installed wide. In addition, when a curved part heating element is installed in a wide manner in this way, the lower part of the inner pot can be heated in a balanced manner in cooperation with the bottom heating element, and cooked rice can be cooked deliciously.

In the electric rice cooker, the area of the curved heating element is set to be twice or more the area of the bottom heating element.

If comprised in this way, a heat generating body can be provided in the wide area range of the outer periphery side part (inner pot curved part) of an inner pot lower part, and the heating balance by a bottom part heating element and a curved part heating element can be allocated favorably. it can.

Therefore, in addition to the above-described effects, the wide area area of the lower portion of the inner pot can be heated uniformly, and the rice can be cooked even more deliciously.

In the electric rice cooker, the amount of the heat generating material per area of the bottom heating element is set larger than the amount of the heat generating material per area of the curved heating element. The heating at the time of cooking is mainly the bottom heating element, and the heat generation amount per unit area of the heating element is proportional to the amount of heat generating material per unit area (silver amount).

Therefore, with such a configuration, even if the area of the bottom heating element portion is reduced as described above, the amount of heat generated per unit area at the bottom heating element portion increases, and the main heating during rice cooking is increased. A sufficient amount of heat can be ensured at the bottom heating element portion serving as the heating portion.

Therefore, in the electric rice cooker, in addition to the above-described effects, the lower portion of the inner pot can be heated in a more balanced manner, and thereby there is an effect that the cooked rice can be cooked more deliciously.

On the other hand, the heat generation amount of the bottom heating element is basically proportional to the amount of heat generating material in the same portion. Therefore, if the thickness of the heating element is uniform throughout, each part generates heat uniformly, but when viewed as a whole, heat dissipation is possible and there is less heat dissipation than the radially outer peripheral side with a wide heating area. As a result, the amount of heat is concentrated on the radially inner periphery side (center side) where the heating area is narrow, and the temperature tends to increase, resulting in a problem of uneven heating in the inner and outer directions of the bottom of the inner pot.

Therefore, in the electric rice cooker, the bottom heating element is composed of a thin part and a thick part without changing the whole thickness, and changes the distribution of the calorific value in the radial direction. The non-uniformity of heat quantity and temperature distribution that causes such heating unevenness is eliminated.

On the other hand, the amount of the heat generating material per unit area is smaller than the amount of the heat generating material of the bottom heat generating element, and the area where the area is twice or more is larger than the thickness of the heat generating element. It has a constant wall thickness. And thereby, the balance of the heating amount with the bottom heating element is improved as described above, and the convection in the inner pot at the time of cooking is prevented from being displaced to the outer peripheral side of the inner pot, and the curvature of the inner pot Installation of the curved heating element on the surface can be realized easily and in a good state.

[Effect of the invention of claim 2 of the present application]
In the electric rice cooker according to the first aspect of the present invention, the range of the inner pot bottom is set to be approximately half the outer diameter of the inner pot side peripheral portion, and the inner pot curved portion extends from the outer end of the inner pot bottom to the inner pot side. Since it is formed in a substantially arc shape in the range of the horizontal distance portion to the peripheral portion and the height portion substantially the same as the horizontal distance, the following effects are obtained.

First, since the entire inner pan curved portion has a large width and the inner pan curved portion has a small (loose) inclination angle, the curved portion heating element (silver paste) installed therein is transferred by transfer paper or applied by screen printing. When the base sheet (transfer sheet or screen sheet) is stretched along the inner pot curved portion, it becomes difficult to wrinkle, and it is easy to install the curved portion heating element (silver paste). There is an effect of becoming.

In addition, if the inclination angle of the inner pot curved portion is small (loose), it is difficult to make wrinkles when the base sheet is stretched, so the width of the base sheet stretched on the inner pot curved portion can be widened. As a result, there is an effect that the bending portion heating element can be installed wide. In addition, when a curved part heating element is installed in a wide manner in this way, the lower part of the inner pot can be heated in a balanced manner in cooperation with the bottom heating element, and cooked rice can be cooked deliciously.

Moreover, in the electric rice cooker, the area of the curved heating element is set to be twice or more than the area of the bottom heating element.

If comprised in this way, a heat generating body can be provided in the wide area range of the outer periphery side part (inner pot curved part) of an inner pot lower part, and the heating balance by a bottom part heating element and a curved part heating element can be allocated favorably. it can.

Therefore, in addition to the above-described effects, the wide area area of the lower portion of the inner pot can be heated uniformly, and the rice can be cooked even more deliciously.

In the electric rice cooker, the amount of the heat generating material per area of the bottom heating element is set larger than the amount of the heat generating material per area of the curved heating element. The heating at the time of cooking is mainly the bottom heating element, and the heat generation amount per unit area of the heating element is proportional to the amount of heat generating material per unit area (silver amount).

Therefore, with such a configuration, even if the area of the bottom heating element portion is reduced as described above, the amount of heat generated per unit area at the bottom heating element portion increases, A sufficient amount of heat can be ensured at the bottom heating element portion serving as the heating portion.

Therefore, in the electric rice cooker, in addition to the above-described effects, the lower portion of the inner pot can be heated in a more balanced manner, and thereby there is an effect that the cooked rice can be cooked more deliciously.

By the way, as mentioned above, in the electric rice cooker of this invention, while making the range of the said inner pot bottom part into about 1/2 size of the outer diameter of an inner pot side peripheral part, an inner pot curved part is made into the inner pot bottom part. A horizontal distance part from the outer end to the inner pan side peripheral part and a range of the same height part as the horizontal distance are formed in a substantially arc shape, and the area of the curved part heating element with respect to the area of the bottom heating element It is set to 2 times or more.

As a result, the area ratio of the inner pot bottom is also smaller than that of the conventional person, and the area of the bottom heating element installed at the inner pot bottom is also reduced.

However, the heating of the inner pot during rice cooking is centered on the bottom heating element.

For this reason, in the electric rice cooker, as described above, the amount of the heat generating material per area of the bottom heating element is made larger than the amount of the heat generating material per area of the curved heating element to ensure a necessary heat generation amount. Like to do.

However, since a hill is provided on the outer periphery of the bottom of the inner pan, the bottom heating element in that case should be provided over the entire area excluding a part of the central portion from the vicinity of the inner end of the hill. ing.

And thereby, the necessary calorific value of the inner pot bottom where the heating area is relatively small is sufficiently ensured, and good rice cooking performance can be realized.

  Hereinafter, the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view of the electric rice cooker of the present embodiment, and FIG. 2 (A) is used in the electric rice cooker of FIG. FIG. 2B shows a bottom view of the bottom heating element 35 and the curved heating element 36 provided on the lower surface of the inner pot 3 of FIG. 2A. .

  As shown in FIG. 1, the electric rice cooker of this embodiment has a lid 2 placed on the top of a rice cooker body 1, and an inner pan 3 is freely put in and out of the rice cooker body 1. ing. The rice cooker body 1 has an exterior body 10 and an inner case 14.

  The exterior body 10 is configured by assembling a synthetic resin bottom member 12 to the lower part of a metal outer case 11 and a synthetic resin shoulder member 13 to the upper part of the outer case 11. In addition, the outer case 11 and the bottom member 12, and the outer case 11 and the shoulder member 13 are respectively connected by force fitting.

  In this embodiment, the inner case 14 is made of a synthetic resin material in which a metal side wall 14B is coupled to the upper portion of a dish-like bottom material 14A. A heat-insulating side heater 16 is attached to the outer surface of the side wall 14B of the inner case 14. A hole for inserting a temperature sensor 15 for detecting the temperature of the bottom of the inner pot 3 is formed in the center of the bottom material 14A of the inner case 14. On the upper surface of the inner case bottom material 14A, seats 18 made of silicon material are embedded at three locations in the circumferential direction. The inner case 14 is fixed to the bottom member 12 with a fixing screw (not shown).

  As the inner pot 3, a ceramic pot (earthen pot) is used. The inner pot 3 has an outer diameter slightly smaller than the inner diameter of the side peripheral wall 14b of the inner case 14, and is accommodated in the inner case 14 so as to be freely put in and out.

  The inner pot 3 is configured by providing a curved portion 32 serving as a curved surface portion between a bottom portion 31 serving as a horizontal portion and a side peripheral portion 33 serving as a vertical portion.

  On the lower surface of the outer end portion of the inner pot bottom portion 31 (the outer end portion of the range D1 of the inner pot bottom portion 31 to be described later), a small height plateau (annular protrusion) 34 is formed. In a state where the inner pot 3 is housed in the inner case 14, the hill 34 of the inner pot 3 is placed on the three receiving seats 18.

  The inner pot 3 used in this embodiment is slightly larger in diameter than the inner pot used in the known example of FIG. The lower one is used.

  The lid 2 has an outer lid 21 and an inner lid 22 provided on the lower surface portion of the outer lid 21. A steam vent passage 23 with a pressure regulating valve 24 is formed in the outer lid 21. A lid heater 25 is provided in the outer lid 21.

  And this cover 2 is pivotally supported by the hinge unit which is not shown in figure at the rear upper part of the rice cooker main body 1, and the front side is made to open and close by arc rotation.

  In FIG. 1, reference numeral 9 denotes a handle. The handle 9 can be pivoted up and down around the left and right shafts.

  The electric rice cooker of this embodiment is configured so that the inner pot 3 can be heated by electromagnetic induction. That is, the inner pot 3 is provided with a bottom heating element 35 on the lower surface of the inner pot bottom 31 and a bending part heating element 36 on the outer surface of the inner pot bending part 32. On the other hand, on the lower surface side of the inner case 14, a bottom work coil 41 is provided at a position corresponding to the bottom heating element 35, and a bending portion work coil 42 is provided at a position corresponding to the bending heating element 36.

  The bottom work coil 41 is installed in a circular annular shape (doughnut shape) at a position facing the bottom heating element 35 of the inner pot 3 on the lower surface side of the bottom material 14A of the inner case 14. Further, the bending portion work coil 42 is installed in a circular annular shape (doughnut shape) at a position facing the bending portion heating element 36 of the inner pot 3 on the lower surface side of the bottom material 14A of the inner case 14. The bottom work coil 41 and the bending part work coil 42 are respectively installed at concentric positions with the center of the inner case bottom material 14A.

  A heat shield plate 19 is provided on the upper surface of the inner case bottom material 14A, and the heat shield plate 19 prevents radiant heat from the bottom heating element 35 from being transmitted to the bottom work coil 41 side.

  In the electric rice cooker of this embodiment, when the bottom work coil 41 and the bending portion work coil 42 are energized, the bottom heating element 35 and the bending portion heating element 36 are caused to generate heat by electromagnetic induction, respectively, by the magnetic force from the work coil. The inner pot 3 can be heated from the bottom 31 and the curved portion 32, respectively.

  The inner pot 3 used in this embodiment is an inner pot bottom 31 in which the inner part of the hill 34 is a horizontal part. And in this inner pot 3, as shown to FIG. 2 (A), while setting the range D1 of the inner pot bottom part 31 to the magnitude | size of about 1/2 of the outer diameter D0 of the inner pot side peripheral part 33, The inner pan curved portion 32 has a horizontal distance D2 portion from the hill 34 (substantially the outer end portion of the hill 34) to the outer surface of the inner pan side peripheral portion 33, and a range of the H portion substantially the same height as the horizontal distance D2. Are formed in a substantially arc shape. Therefore, in the shape of the inner pot 3, the curved portion 32 is considerably wide, and the inclination angle A of the entire width of the curved portion 32 is a fairly gentle angle of about 45 °.

  As shown in FIGS. 2 (A) and 2 (B), the bottom heating element 35 of the inner pot bottom 31 has a large area range (circular annular portion having a width L0) on the inner side from the position near the inner end of the hill 34. Is provided. That is, because the temperature sensor 15 (FIG. 1) is in contact with the center of the lower surface of the inner pot bottom 31, a predetermined small area (diameter N) of the center of the lower surface of the inner pot bottom 31 has a heating element. Although there is no part, the bottom heating element 35 is provided in the remaining part (circular annular part with the width L0) in the inner pot bottom part 31.

  Incidentally, the amount of heat generated by the bottom heating element 35 is proportional to the amount of heat generating material (amount of silver). If the thickness of the heat generating material is uniform, the portion near the center in the width direction is the portion near the inner and outer ends. The amount of heat generation is further increased, and heating unevenness is caused by the widthwise portion of the bottom heating element 35 (rice cooking unevenness occurs and the cooked rice may be partially burnt).

  Therefore, in this embodiment, as shown in FIGS. 2A and 2B, a portion where the amount of the heat generating material (amount of silver) is different is provided at a predetermined position in the width direction of the bottom heating element 35. The inner pot bottom 31 can be heated uniformly during heat generation. That is, in this embodiment, the range of the predetermined width L1 closer to the center in the entire width L0 of the bottom heating element 35 is the thin portion 35A, while the inner and outer peripheral portions of the thin portion 35A are the thick portions 35B and 35B, respectively. . The range and thickness of the thin portion 35A and the thick portions 35B, 35B are set so that the inner pot bottom 31 can be uniformly heated when the bottom heating element 35 generates heat. When the thin portion 35A and the thick portions 35B and 35B are provided on the bottom heating element 35, the thin portion 35A and the thick portions 35B and 35B are installed in two steps (transfer or screen printing). Good.

  By the way, the ceramic inner pot (earthen pot) 3 has poor thermal conductivity compared to metal ones. In an electric rice cooker that uses an earthen pot for the inner pot 3, the inner pot 3 is uniformly heated during cooking. In order to do so, it is preferable to heat from a wide area portion below the inner pot.

  Therefore, in the inner pot 3 used in this embodiment, as shown in FIGS. 2 (A) and 2 (B), the bending portion heating element 36 of the inner pot bending portion 32 has a considerably wide range (range of width M). It is installed in the area part so that it can be heated from a wide area part under the inner pot.

  The bottom heating element 35 and the bending part heating element 36 provided on the bottom 31 and the bending part 32 of the inner pot 3 are, in recent years, transferring silver paste, which is a heating material, with transfer paper, or using the silver paste as a screen. It is often used to install by printing.

  In order to install the heating elements 35 and 36 in the inner pot 3, the lower surface (heating element installation surface) of the inner pot bottom 31 is flat with respect to the inner pot bottom 31. The base sheet (transfer sheet or screen sheet) can be stretched relatively easily and accurately (cleanly) on the lower surface of the inner pot bottom 31 by either the silver paste transfer method by screen printing or the silver paste coating method by screen printing. Since the inner pot bending portion 32 is inclined in a curved state with respect to the outer surface of the inner pot bending portion 32, it is difficult to neatly stretch the base sheet (transfer sheet or screen sheet).

  That is, in order to transfer the silver paste 36 'to the outer surface of the curved portion 32 by the transfer paper 5 as shown in FIG. 3, for example, as shown in FIG. 3, the transfer paper 5 is curved as indicated by reference numeral 5'. The outer surface of the portion 32 is covered, but at this time, an excessive portion is formed in the circumferential direction of the portion near the outer periphery of the transfer paper 5 ′, and the excessive portion tends to become wrinkles, and the work of extending the wrinkles is troublesome. In particular, the larger the inclination angle B (inclination angle with respect to the inner pot bottom) of the heating element installation surface in the inner pot bending portion 32, the more easily wrinkles are formed on the outer periphery of the transfer paper.

  Therefore, as shown in FIG. 2 (A), the inner pot 3 used in this embodiment has a range D1 of the inner pot bottom 31 that is approximately ½ the outer diameter D0 of the inner pot side peripheral portion 33. Then, the inner pot curved portion 32 is formed in a substantially arc shape in the range of the horizontal distance portion D2 from the outer end of the inner pot bottom portion 31 to the inner pot side peripheral portion 33 and the height portion H substantially the same as the horizontal distance. As a result, the entire width of the inner pot bending portion 32 is increased, and the inclination angle of the inner pot bending portion 32 is decreased (loosened). That is, in the inner pot bending portion 32 of FIG. 2A, the inclination angle A of the entire width (range of the width D2 and the height H) of the bending portion 32 is about 45 °, and the bending portion heating element 36 among them is provided. The inclination angle B of the installation surface is about 42 °.

  And if the whole width | variety of the inner pot curved part 32 is enlarged in this way and the inclination angle of this inner pot curved part 32 is made small (inclination angle B of a heat generating body installation surface is about 42 degrees), the curved part installed there For example, when the heat generating member 36 is transferred by the transfer paper 5 as shown in FIG. 3, when the transfer paper 5 is stretched along the inner pot curved portion 32 as indicated by reference numeral 5 ', the transfer paper 5 The excess portion that can be formed in the circumferential direction of the portion near the outer periphery of ′ is reduced, and as a result, the transfer paper 5 ′ is less likely to be wrinkled. In addition, when the transfer paper 5 is stretched over the outer surface of the inner pot curved portion 32, the silver paste 36 '(FIG. 3) applied to the transfer paper 5 is made more uniform (see FIG. 3). In this embodiment, the thickness of the heat generating material (thickness of the silver paste 36 ′) in the portion that becomes the curved portion heating element 36 is made uniform.

  In addition, if the inclination angle B of the heating element installation surface in the inner pot bending portion 32 is small (gradual) as described above, wrinkles are difficult to occur when the transfer paper 5 is stretched, and therefore the inner pot bending portion 32. As a result, it is possible to widen the width of the transfer paper 5 to be stretched, and as a result, it is possible to install the curved portion heating element 36 in a wide width (width M).

  In the inner pot 3, the area of the curved heating element 36 is set to be twice or more the area of the bottom heating element 35. In the embodiment shown in FIG. 2B, the area of the curved heating element 36 is about 3.5 times the area of the bottom heating element 35. Thus, when the area of the curved heating element 36 is made larger than the area of the bottom heating element 35, the heating balance by the bottom heating element 35 and the bending heating element 36 can be favorably allocated, and the wide area area at the bottom of the inner pot can be obtained. Can be heated evenly (cooked rice can be cooked even more deliciously).

  By the way, in this embodiment, since the area ratio of the inner pot bottom 31 is smaller than the conventional one, the area of the bottom heating element 35 installed on the inner pot bottom 31 is inevitably smaller. At the time of heating, the bottom heating element 35 is the main. Therefore, in the inner pot 3 of this embodiment, the amount of the heat generating material per area of the bottom heating element 35 is set larger than the amount of the heat generating material per area of the bending portion heating element bending portion heating element 36. Therefore, even if the area of the bottom heating element 35 is reduced, the amount of heat generation per unit area at the bottom heating element 35 portion increases, and the heating value at the bottom heating element 35 portion during cooking is sufficiently high. It can be secured. In addition, although the heating to the inner pot curved part 32 part becomes better in terms of heating balance as the area is larger, when the heating temperature by the curved part heating element 36 becomes abnormally high, the convection at the time of rice cooking is within the inner pot 3. When the bending portion heating element 36 is heated to an abnormally high temperature, the rice cooking balance is likely to be deteriorated (the inner pot becomes difficult to be heated uniformly) and the surrounding member (for example, It is necessary to take measures against heat with respect to the inner case bottom material 14A and the outer curved portion work coil 42, etc. (high cost).

  In the inner pot 3 of this embodiment, the thickness of the inner pot bottom part 31 and the thickness of the inner pot curved part 32 are 4 to 4.5 mm, respectively, and the thickness of the inner pot side peripheral part 33 is 4.5 to 5.5 mm. It is said. In addition, in the inner pot 3 used by the well-known example of FIGS. 4-6, the thickness of the inner pot bottom part 31 and the thickness of the inner pot curved part 32 are 4-4.5 mm, respectively, and the inner pot side peripheral part 33 is used. The thickness is set to 7 mm. And at the time of heat retention, although the inner pot side peripheral part 33 is heated with the side heater 16 (FIG. 1), if this inner pot side peripheral part 33 is thick (7 mm), much heating energy (electric power) is equivalent. ) Is required. Therefore, as in this embodiment, when the thickness of the inner pan side peripheral portion 33 is 4.5 to 5.5 mm, energy saving is achieved during heat insulation.

  Moreover, in this embodiment, as shown in FIG. 3, the small recessed part 31a of substantially the same depth as the thickness of the bottom part heating element 35 is provided in the part in which the bottom part heating element 35 is installed in the lower surface of the inner pot bottom part 31. On the other hand, a small recess 32 a having a depth substantially equal to the thickness of the bending portion heating element 36 is provided in a portion where the bending portion heating element 36 is installed on the outer surface of the inner pot bending portion 32. When the small recesses 31a and 32a are provided in the installation portions of the heating elements 35 and 36 in this way, the small recesses 31a and 32a perform a positioning function when the heating elements 35 and 36 are installed. Become. In addition, the portion where the small recess 32a is formed in the inner pot bending portion 32 is thin by the depth of the small recess 32a, and the heat conduction to the inner surface of the bending portion 32 is improved when the bending portion heating element 36 generates heat. Since the portion without the small concave portion 32a in the inner pot curved portion 32 is thick, the heat storage property of the portion without the small concave portion 32a is improved.

  In addition, the thickness of the installation part (small recess 31a) of the bottom heating element 35 in the inner pot bottom 31 is slightly thinner than the thickness of the installation part (small recess 32a) of the bending part heating element 36 in the inner pot bending part 32. Can do.

  In the electric rice cooker of this embodiment, when the inner pot 3 in which rice and water are put at the time of rice cooking is accommodated in the inner case 14 and the rice cooking switch is turned on, the bottom work coil 41 and the curved work coil 42 are separated from each other. The bottom heating element 35 and the curved heating element 36 on the inner pot 3 side are heated by electromagnetic induction, respectively, and the lower part of the inner pot is heated (cooked rice) from a wide area by the heat generation of both the heating elements 35 and 36. become. In addition, after the end of rice cooking (after the energization of the work coils 41 and 42 is turned off), the cooked rice in the inner pot 3 is kept warm by the side heater 16 and the lid heater 25.

  By the way, in the electric rice cooker of this embodiment, while setting the range D1 (FIG. 2) of the pan bottom 31 as substantially half the outer diameter D0 of the inner pan side peripheral portion 33, as described above, Since the curved portion 32 is formed in a substantially arc shape in the range of the horizontal distance D2 portion from the outer end of the inner pan bottom portion 31 to the inner pan side peripheral portion 33 and the horizontal distance and the same height H portion, The entire width of the bending portion 32 (the range of the horizontal distance D2 and the height H) is large and the inclination angle of the inner pot bending portion 32 is small (particularly, the inclination angle B of the installation surface of the bending portion heating element 36 is about 42 °). become).

  Therefore, when the silver paste 36 'is transferred by the transfer paper 5 as shown in FIG. 3, for example, as shown in FIG. It becomes difficult to make wrinkles when it is stretched along, and the transfer work of the silver paste 36 'becomes easy. In addition, when apply | coating the curved part heat generating body (silver paste) 36 by screen printing, a screen sheet is stretched on the outer surface of the inner pot curved part 32, but also in this case, the inclination angle B of the inner pot curved part 32 Is small, the screen sheet can be stretched relatively easily and cleanly.

  In addition, if the inclination angle B of the heating element installation surface in the inner pot bending portion 32 is small (gradual) as described above, wrinkles are difficult to occur when the transfer paper 5 is stretched, and therefore the inner pot bending portion 32. As a result, it is possible to widen the width of the transfer paper 5 to be stretched, and as a result, it is possible to install the curved portion heating element 36 in a wide width (width M). As described above, when the curved heating element 36 is installed wide, the lower part of the inner pot can be heated in a balanced manner in cooperation with the bottom heating element 35, and the cooked rice can be cooked deliciously.

It is a horizontal direction center longitudinal cross-sectional view of the electric rice cooker of this-application embodiment. It is structure explanatory drawing of the inner pot in the electric rice cooker of FIG. It is explanatory drawing of the heat generating body installation method to the inner pot curved part in the electric rice cooker of FIG. It is a half sectional view of the conventional electric rice cooker. It is structure explanatory drawing of the inner pot in the electric rice cooker of FIG. It is explanatory drawing of the heat generating body installation method to the inner pot curved part in the electric rice cooker of FIG.

  DESCRIPTION OF SYMBOLS 1 is a rice cooker body, 2 is a lid, 3 is an inner pot, 10 is an exterior body, 11 is an outer case, 12 is a bottom member, 14 is an inner case, 31 is the bottom of the inner pot, 32 is a curved portion of the inner pot , 33 is a side peripheral part of the inner pot, 34 is a hill, 35 is a bottom heating element, 36 is a bending part heating element, 41 is a bottom work coil, and 42 is a bending part work coil.

Claims (2)

Use a non-metallic material inner pot in the rice cooker body and provide a curved part that becomes a curved part between the bottom part that becomes the horizontal part and the side peripheral part that becomes the vertical part in the inner pot. to, respectively, the inner pan bottom portion and the inner bowl bending portion provided bottom heating element and the curved portion heating element which generates heat by electromagnetic induction, and electromagnetic the rice cooker in the main the bottom heating element and the curved portion heating element respectively setting a work coil for inductively heating only, the range of the inner pan bottom portion with a size of about 1/2 of the outer diameter of the inner pan side peripheral portion, said inner bowl curved portion from the outer end of the inner pan bottom portion It is formed in a substantially arc shape in the range of the horizontal distance portion to the inner pan side peripheral portion and the height portion substantially the same as the horizontal distance, and the area of the curved portion heating element is double the area of the bottom heating element. While setting the above, the amount of heat generating material per area of the bottom heating element is An electric rice cooker having an amount larger than the amount of heat generating material per area of the heating element, wherein the bottom heating element is configured to have a thin part and a thick part, while the curved part heating element is An electric rice cooker having a constant thickness throughout . Use a non-metallic material inner pot in the rice cooker body and provide a curved part that becomes a curved part between the bottom part that becomes the horizontal part and the side peripheral part that becomes the vertical part in the inner pot. A bottom heating element and a bending part heating element that generate heat by electromagnetic induction are provided on the inner pot bottom part and the inner pot bending part, respectively, and the bottom heating element and the bending part heating element are electromagnetically provided in the rice cooker body, respectively. A work coil for induction heating is provided, and the range of the inner pot bottom is set to be approximately half the outer diameter of the inner pot side peripheral portion, and the inner pot curved portion is extended from the outer end of the inner pot bottom to the above. It is formed in a substantially arc shape in the range of the horizontal distance part to the inner pan side peripheral part and the substantially same height as the horizontal distance, and the area of the curved part heating element is more than twice the area of the bottom heating element While the amount of heat generating material per area of the bottom heating element is set to An electric rice cooker having an amount larger than the amount of heat generating material per area of the heating element, wherein a height is provided on the outer periphery of the bottom of the inner pan, and the bottom heating element is located near the inner end of the height An electric rice cooker provided over the entire area excluding a part of the center .

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