JP5793656B2 - Induction heating pan - Google Patents

Description

  The present invention relates to a pan for reducing noise for induction heating.

  Conventionally, this kind of induction heating pan has a substantially circular shape when viewed from above. In addition, there is also a case in which a substantially circular convex portion is formed on a substantially circular pan bottom as viewed from above (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2003-188792

  However, in the conventional configuration, the bottom of the pan is installed on a substantially concentric circle on a substantially circular heating coil as viewed from above, and an electromagnetic force perpendicular to the installation surface is generated at the bottom of the pan by the heating coil. When the natural frequency of the pan bottom coincides with 1 / n times the frequency of the current flowing through the heating coil (n = 1, 2, 3,...), And in the vibration mode of the pan bottom at that time When the stimulation coefficient in the direction perpendicular to the installation surface is not zero, a resonance phenomenon occurs at the bottom of the pan, and there is a problem that noise such as bee or dust is likely to occur.

  This invention solves the said conventional subject, and it aims at reducing a noise by devising the shape of the pan bottom part of the pan for induction heating.

In order to solve the conventional problems, the induction heating pan of the present invention is placed substantially concentrically on a substantially circular heating coil as viewed from above, and is induction-heated by flowing a high-frequency current through the heating coil. An induction heating pan provided and used in combination with a predetermined induction heating cooker, a heat generating layer made of a magnetic metal, and a metal having a thermal conductivity equal to or higher than that of aluminum formed on the heat generating layer It is made of a clad material composed of a high thermal conductive layer made of a material, and has an upper opening that is substantially circular when viewed from above, a side wall that forms the opening, and a pan bottom that is formed at the lower end of the side wall. The pan bottom has no irregularities, and the natural frequency of the pan bottom changes as an elliptical plane having only two axes of line symmetry perpendicular to each other when viewed from above. induced by One in which the noise of the enthusiasm was less likely to occur.

  As a result, the peripheral portion of the bottom of the pan is less affected by the magnetic flux generated by the heating coil, so that it is fixed regardless of whether or not there is an operation in a substantially mounted state and does not vibrate. On the other hand, in the central part, it is far from the peripheral part and the action of force due to the influence of magnetic flux is large. As a result, the noise is generated, but the configuration described above is perpendicular to the installation surface in the central portion without changing the shape of the conventional opening compared to the case of a substantially circular pan bottom having the same area. The rigidity in the direction can be increased, and the natural frequency of the pan bottom shifts to the higher frequency and matches 1 / n times the frequency of the current flowing in the heating coil (n = 1, 2, 3,...) By reducing the stimulation coefficient in the direction perpendicular to the installation surface in the pot bottom vibration mode, it is possible to suppress the occurrence of the resonance phenomenon and make it difficult to generate noise such as bee or dust.

  The induction heating pan of the present invention can realize low vibration and low noise.

Front view and sectional view of induction heating pan in embodiment 1 of the present invention Sectional view of the pan placed on the induction heating cooker Front view and sectional view of sample number 2 where the pan bottom is a circular pan The eigenvalue analysis result (a graph in which the horizontal axis is the eigenvalue and the vertical axis is the stimulation coefficient Z) is shown for sample number 1 which is the pan of Embodiment 1 of the present invention and sample number 2 whose pan bottom is a circular pan. Graph Front view and sectional view of induction heating pan in embodiment 2 of the present invention The eigenvalue analysis result (a graph in which the horizontal axis represents the eigenvalue and the vertical axis represents the stimulation coefficient Z) of sample number 3 which is the pan of Embodiment 2 of the present invention and sample number 2 whose pan bottom is a circular pan is shown. Graph Front view and sectional view of induction heating pan in Embodiment 3 of the present invention The eigenvalue analysis result (a graph in which the horizontal axis represents the eigenvalue and the vertical axis represents the stimulation coefficient Z) of sample number 4 which is the pan of Embodiment 3 of the present invention and sample number 2 whose pan bottom is a circular pan is shown. Graph Front view and sectional view of induction heating pan in embodiment 4 of the present invention The eigenvalue analysis result (a graph in which the horizontal axis represents the eigenvalue and the vertical axis represents the stimulation coefficient Z) of sample number 5 which is the pan of Embodiment 4 of the present invention and sample number 2 whose pan bottom is a circular pan is shown. Graph Front view and sectional view of induction heating pan in Embodiment 5 of the present invention The eigenvalue analysis result (a graph in which the horizontal axis is the eigenvalue and the vertical axis is the stimulation coefficient Z) is shown for sample number 6 which is the pan of Embodiment 5 of the present invention and sample number 2 whose pan bottom is a circular pan. Graph

The first invention is provided and used in combination with a predetermined induction heating cooker which is placed substantially concentrically on a substantially circular heating coil as viewed from above, and which is induction heated by flowing a high frequency current through the heating coil. An induction heating pan comprising a heat generating layer made of a magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. And a main body formed into a shape having a substantially circular upper opening as viewed from above by pressing, a side wall forming the opening, and a pan bottom formed at the lower end of the side wall, Has no irregularities and is made to be less likely to generate noise during induction heating by changing the natural frequency of the bottom of the pan as an elliptical plane having only two line symmetry axes orthogonal to each other when viewed from above. To do Therefore, compared to the case of a substantially circular pan bottom of the same area, the rigidity in the vertical direction can be increased with respect to the installation surface in the center, and the natural frequency of the pan bottom shifts to a higher frequency. Do not make it coincide with 1 / n times the frequency of the current flowing in the heating coil (n = 1, 2, 3,...), Or reduce the stimulation coefficient in the direction perpendicular to the installation surface in the vibration mode of the pan bottom. It is possible to suppress the occurrence of resonance and make it difficult to generate noise such as bee or dust.

The second invention is provided and used in combination with a predetermined induction heating cooker that is mounted substantially concentrically on a substantially circular heating coil as viewed from above, and is induction-heated by flowing a high-frequency current through the heating coil. An induction heating pan comprising a heat generating layer made of a magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. And a body formed into a shape having a substantially circular upper opening as viewed from above by pressing, a side wall forming the opening, and a pot bottom formed at the lower end of the side wall. And having a substantially circular pan bottom, and having an elliptical convex portion having first and second line symmetry axes perpendicular to each other as viewed from above, projecting downward from a portion of the pan bottom, The length of the convex part on the line symmetry axis of The first width is equal to or larger than the approximate diameter of the heating coil having a predetermined diameter, and is within the placement range of the induction heating cooker, and the convex portion on the second line-symmetric axis The second width, which is the length of the plate, is made shorter than the first width, and is made large enough to form the elliptical shape, thereby generating noise during induction heating by changing the natural frequency of the pan bottom. By making it difficult, the same effect as the first invention can be obtained without changing the shape of the entire pan bottom and the distance between the heating coil and the center of the pan bottom from the conventional one.

The third invention is provided and used in combination with a predetermined induction heating cooker that is placed substantially concentrically on a substantially circular heating coil when viewed from above, and is induction-heated by flowing a high-frequency current through the heating coil. An induction heating pan comprising a heat generating layer made of a magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. And a body formed into a shape having a substantially circular upper opening as viewed from above by pressing, a side wall forming the opening, and a pot bottom formed at the lower end of the side wall. A substantially circular pan bottom, and having an elliptical recess having first and second line symmetry axes perpendicular to each other when viewed from above as a concave portion in a portion of the pan bottom, The length of the concave portion on the axis of line symmetry The first width is set to be equal to or larger than the approximate diameter of the heating coil having a predetermined diameter, and is within the above-described range of the induction heating cooker, and the concave portion on the second line symmetry axis It is difficult to generate noise during induction heating by changing the natural frequency of the bottom of the pan by making the second width, which is the length, shorter than the first width and making the elliptical shape large. By doing so, the same effect as that of the first invention can be obtained without changing the shape of the entire pan bottom and the stability at the time of placing. Furthermore, by ensuring the distance between the center portion of the pan bottom and the installation surface, it becomes difficult to contact each other when a resonance phenomenon occurs, and noise can be reduced.

The fourth invention is provided and used in combination with a predetermined induction heating cooker which is placed substantially concentrically on a substantially circular heating coil as viewed from above, and which is induction-heated by passing a high-frequency current through the heating coil. An induction heating pan comprising a heat generating layer made of a magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. And a body formed into a shape having a substantially circular upper opening as viewed from above by pressing, a side wall forming the opening, and a pot bottom formed at the lower end of the side wall. A substantially circular pan bottom, and having an elliptical substantially annular convex portion having first and second line symmetry axes that are orthogonal to each other when viewed from above, projecting downward on a portion of the pan bottom, The convex portion on the first line symmetry axis. The first width, which is the length of the side, is equal to or larger than the approximate diameter of the heating coil having a predetermined diameter, and is within the above-described range of the induction heating cooker, and the second symmetry axis Inducing by changing the natural frequency of the bottom of the pan by making the second width, which is the outer length of the upper convex portion, shorter than the first width and making it the size that forms the elliptical shape By making it difficult for noise during heating to occur, the same effect as that of the first invention can be obtained without changing the shape of the entire bottom of the pan from the conventional one. Furthermore, by ensuring the distance between the center portion of the pan bottom and the installation surface, it becomes difficult to contact each other when a resonance phenomenon occurs, and noise can be reduced.

The fifth aspect of the present invention is provided and used in combination with a predetermined induction heating cooker that is mounted substantially concentrically on a substantially circular heating coil as viewed from above, and is induction-heated by flowing a high-frequency current through the heating coil. An induction heating pan comprising a heat generating layer made of a magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. And a body formed into a shape having a substantially circular upper opening as viewed from above by pressing, a side wall forming the opening, and a pot bottom formed at the lower end of the side wall. An approximately circular recess having an elliptical shape with first and second axis of symmetry that are orthogonal to each other when viewed from above, with a portion of the pan bottom being recessed downward. Of the recess on the first line symmetry axis The first width, which is the length of the side, is equal to or larger than the approximate diameter of the heating coil of a predetermined diameter, and is within the above-described installation range of the induction heating cooker, and the second line symmetry Inducing by changing the natural frequency of the bottom of the pan by making the second width, which is the outer length of the concave portion on the shaft, shorter than the first width and having the size that forms the elliptical shape By making it difficult for noise during heating to occur, the shape of the entire pan bottom, the stability at the time of placing, and the distance between the heating coil and the center of the pan bottom are the same as in the first invention, without changing the conventional one. An effect can be obtained.

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

(Embodiment 1)
FIG. 1 shows a front view and a sectional view of an induction heating pan according to a first embodiment of the present invention. The pan body 1 is made of a clad material composed of a heat generation layer (outside of the pan) made of SUS430 and a high heat conduction layer (inside of the pan) made of aluminum formed on the heat generation layer.

  Each of the clad materials has a thickness of SUS430 of 0.5 mm and an aluminum thickness of 1.5 mm, and the pan bottom 2 has a first width A on the first line symmetry axis aa of 227 mm. The second width B on the second line symmetry axis bb is an elliptical shape of 189 mm. That is, this elliptical shape has only two line symmetry axes.

  Such a pan of Embodiment 1 was designated as sample number 1.

  Moreover, sectional drawing of the state in which the pan was mounted in the induction heating cooking appliance is shown in FIG. The pan body 3 is placed on the top plate 4 substantially concentrically with the heating coil 5, and a high frequency current of 20 kHz to 40 kHz is passed through the heating coil 5 by the inverter 6.

  Further, eigenvalue analysis was performed using a pan having a circular shape with a diameter of 190 mm as viewed from the top as shown in FIG. 3 as sample number 2, and the results are shown in FIG.

As apparent from FIG. 4, sample number 1 which is the pan of the first embodiment in which the bottom of the pan has an oval shape has a higher eigenvalue than the sample number 2 whose pan bottom is a circular pan. While shifting by 18% (1848 Hz), the stimulation coefficient was also reduced by 88% (32), indicating that the resonance phenomenon is less likely to occur.

  As described above, in the present embodiment, the pan bottom portion 2 has no irregularities and has a shape having only two line symmetry axes aa and bb that are orthogonal to each other when viewed from above. The rigidity in the direction perpendicular to the installation surface in the center is increased as compared with the case of a substantially circular pan bottom 7 having a number of line symmetry axes that are orthogonal to each other when viewed from the same area. The natural frequency at the bottom of the pan shifts to a higher frequency so that it does not coincide with half the frequency of the current flowing through the heating coil, or perpendicular to the installation surface in the vibration mode of the pan bottom The direction stimulation coefficient can be reduced, and the occurrence of a resonance phenomenon can be suppressed to make it difficult to generate noise such as bee or dust.

  In addition, the stimulation coefficient of Sample No. 2 is the largest at 10 to 11 kHz, which is ½ times the current frequency of 20 to 22 kHz, and this range was set as the frequency band of interest.

(Embodiment 2)
FIG. 5 shows a front view and a cross-sectional view of the induction heating pan of the second embodiment of the present invention. The pan body 8 is made of a clad material composed of a heat generation layer (outside of the pan) made of SUS430 and a high heat conductive layer (inside of the pan) formed of aluminum formed on the heat generation layer.

  Each of the clad materials has a SUS430 plate thickness of 0.5 mm and an aluminum plate thickness of 1.5 mm, and the pan bottom portion 9 has a circular shape with a diameter of 190 mm. A first width on the line symmetry axis aa is 180 mm, a second width on the second line symmetry axis bb is 144 mm, and an elliptical convex part 10 having a depth of 2 mm is formed. Yes.

  An eigenvalue analysis was performed using the pan of Embodiment 2 as sample number 3, and the results are shown in FIG.

  Sample No. 2 is used for comparison.

  As apparent from FIG. 6, sample number 3 which is the pan of the second embodiment is shifted by 24% (2446 Hz) in the eigenvalue higher in frequency with respect to sample number 2 whose pan bottom is a circular pan. At the same time, the stimulation coefficient was also reduced by 66% (24), indicating that the resonance phenomenon is less likely to occur.

  As described above, in the present embodiment, the substantially circular pan bottom portion 9 is provided as viewed from above, and the first and second portions orthogonal to each other as viewed from above are formed in a part of the pan bottom portion 9 so as to protrude downward. Whether the first width a-a, which is the length of the convex portion 10 on the first line-symmetrical axis, is equal to the substantially diameter of the heating coil, having the convex portion 10 having a line-symmetrical axis. , More than that, and by making the second width bb which is the length of the convex portion 10 on the second line symmetry axis shorter than the first width aa, The same effect as in the first embodiment can be obtained without changing the shape and the distance between the heating coil and the center of the pan bottom.

(Embodiment 3)
FIG. 7 shows a front view and a cross-sectional view of the induction heating pan of the third embodiment of the present invention. The pan body 11 is made of a clad material composed of a heat generation layer (outside of the pan) made of SUS430 and a high heat conductive layer (inside of the pan) formed of aluminum formed on the heat generation layer.

Each of the clad materials has a SUS430 plate thickness of 0.5 mm and an aluminum plate thickness of 1.5 mm, and the pan bottom portion 12 has a circular shape with a diameter of 190 mm. The first width on the line symmetry axis aa is 180 mm, the second line symmetry axis b
An elliptical recess 13 having a second width of 144 mm and a depth of 2 mm on -b is formed.

  An eigenvalue analysis was performed using the pan of Embodiment 3 as sample number 4, and the results are shown in FIG.

  Sample No. 2 is used for comparison.

  As is apparent from FIG. 8, sample number 4 which is the pan of the third embodiment shifts the eigenvalue by 25% (2565 Hz) toward the higher frequency with respect to sample number 2 whose pan bottom is a circular pan. At the same time, the stimulation coefficient was also reduced by 64% (23), indicating that the resonance phenomenon is less likely to occur.

  As described above, in the present embodiment, the pan bottom portion 12 that is substantially circular when viewed from above is provided, and the first and second portions that are orthogonal to each other when viewed from above with a portion of the pan bottom portion 12 recessed downward. A recess 13 having a shape with a line symmetry axis, and a first width aa, which is the length of the recess on the first line symmetry axis, is equal to or substantially equal to the diameter of the heating coil. And by setting the second width bb, which is the length of the recess 13 on the second line symmetry axis, to be shorter than the first width aa, the shape and placement of the entire pan bottom 12 portion The same effect as in the first embodiment can be obtained without changing the stability of the time from the conventional one. Furthermore, by ensuring the distance between the center portion of the pan bottom and the installation surface, it becomes difficult to contact each other when a resonance phenomenon occurs, and noise can be reduced.

(Embodiment 4)
FIG. 9 shows a front view and a sectional view of an induction heating pan according to the fourth embodiment of the present invention. The pan body 14 is made of a clad material composed of a heat generation layer (outside of the pan) made of SUS430 and a high heat conduction layer (inside of the pan) made of aluminum formed on the heat generation layer.

  Each of the clad materials has a thickness of SUS430 of 0.5 mm and an aluminum thickness of 1.5 mm, and the pan bottom portion 15 has a circular shape with a diameter of 190 mm. An elliptical annular convex portion 16 having a first width of 180 mm on the line symmetry axis aa, a second width on the second line symmetry axis bb of 144 mm, a width of 18 mm, and a depth of 2 mm. Is forming.

  An eigenvalue analysis was performed using the pan of Embodiment 4 as sample number 5, and the results are shown in FIG.

  Sample No. 2 is used for comparison.

  As is clear from FIG. 10, sample number 5 which is the pan of the fourth embodiment shifts the eigenvalue by 10% (1011 Hz) toward the higher frequency with respect to sample number 2 whose pan bottom is a circular pan. At the same time, the stimulation coefficient was also reduced by 72% (26), indicating that the resonance phenomenon is less likely to occur.

  As described above, in the present embodiment, the substantially circular pan bottom portion 15 as viewed from above is provided, and the first and second portions perpendicular to each other as viewed from above are formed in a part of the pan bottom portion 15 so as to protrude downward. A substantially annular convex portion 16 having a line symmetry axis is provided, and a first width aa, which is the length outside the convex portion on the first line symmetry axis, is approximately the diameter of the heating coil. Or more than that, and the second width bb, which is the length of the outside of the convex portion on the second axis of symmetry, is made shorter than the first width, whereby the entire pan bottom 15 The same effect as in the first embodiment can be obtained without changing the shape of the first embodiment. Furthermore, by ensuring the distance between the center portion of the pan bottom and the installation surface, it becomes difficult to contact each other when a resonance phenomenon occurs, and noise can be reduced.

(Embodiment 5)
FIG. 11: shows the front view and sectional drawing of the pan for induction heating of the 5th Embodiment of this invention. The pan body 17 is made of a clad material composed of a heat generation layer (outside of the pan) made of SUS430 and a high heat conductive layer (inside of the pan) formed of aluminum formed on the heat generation layer.

  Each of the clad materials has a SUS430 plate thickness of 0.5 mm and an aluminum plate thickness of 1.5 mm, and the pan bottom portion 18 has a circular shape with a diameter of 190 mm. The first width on the line symmetry axis aa is 180 mm, the second width on the second line symmetry axis bb is 144 mm, width 18 mm, and depth 2 mm. Is forming.

  An eigenvalue analysis was performed using the pan of the fifth embodiment as a sample number 6, and the results are shown in FIG.

  Sample No. 2 is used for comparison.

  As is apparent from FIG. 12, sample number 6 which is the pan of the fifth embodiment shifts the eigenvalue by 6% (653 Hz) toward the higher frequency with respect to sample number 2 whose pan bottom is a circular pan. In addition, the stimulation coefficient was 69% (25) smaller, indicating that the resonance phenomenon is less likely to occur.

As described above, in the present embodiment, the pan bottom portion 18 that is substantially circular when viewed from above is provided, and the first and second portions that are orthogonal to each other when viewed from above that are recessed downward in a part of the pan bottom portion 18. A substantially annular recess 19 having a shape with a line symmetry axis is provided, and the first width aa, which is the length outside the recess on the first line symmetry axis, is equal to the diameter of the heating coil. Or more, and by making the second width b-b, which is the length of the outside of the recess on the second line symmetry axis, shorter than the first width, the shape of the entire pan bottom 18 In addition, the same effects as those of the first embodiment can be obtained without changing the stability at the time of mounting and the distance between the heating coil and the center of the pan bottom from the conventional one .

  As described above, since the induction heating pan according to the present invention can realize low vibration and low noise, a pan having a substantially circular bottom used for an induction heating cooker for home use or business use, etc. It can be applied to any use.

1, 3, 8, 11, 14, 17 Pan body 2, 7, 9, 12, 15, 18 Pan bottom part 4 Top plate 5 Heating coil 6 Inverter 10, 16 Convex part 13, 19 Concave part

Claims (5)

An induction heating pan that is mounted concentrically on a substantially circular heating coil when viewed from above and is provided in combination with a predetermined induction heating cooker that is induction heated by flowing a high-frequency current through the heating coil. The clad material is composed of a heat generating layer made of magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. An upper opening having a substantially circular shape when viewed from above, a side wall forming the opening, and a main body formed into a shape having a pot bottom formed at the lower end of the side wall, the pot bottom not having irregularities An induction heating pan that is less likely to generate noise during induction heating by changing the natural frequency of the bottom of the pan as an elliptical plane having only two line symmetry axes orthogonal to each other when viewed from above. An induction heating pan that is mounted concentrically on a substantially circular heating coil when viewed from above and is provided in combination with a predetermined induction heating cooker that is induction heated by flowing a high-frequency current through the heating coil. The clad material is composed of a heat generating layer made of magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. A substantially circular pan bottom as viewed from above, comprising a main body formed into a shape having a substantially circular upper opening when viewed from above, a side wall forming the opening, and a pan bottom formed at the lower end of the side wall And having an elliptical convex part having a first and a second line symmetry axis perpendicular to each other as viewed from above, projecting downward on a part of the bottom of the pot, and on the first line symmetry axis The first width which is the length of the convex portion The length of the convex portion on the second line-symmetric axis is equal to or larger than the diameter of the heating coil and within the range described above of the induction heating cooker. Induction heating in which the width of 2 is made shorter than the first width and is made large enough to form the elliptical shape, thereby making it difficult to generate noise during induction heating by changing the natural frequency of the bottom of the pan. Pot for cooking. An induction heating pan that is mounted concentrically on a substantially circular heating coil when viewed from above and is provided in combination with a predetermined induction heating cooker that is induction heated by flowing a high-frequency current through the heating coil. The clad material is composed of a heat generating layer made of magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. A substantially circular pan bottom as viewed from above, comprising a main body formed into a shape having a substantially circular upper opening when viewed from above, a side wall forming the opening, and a pan bottom formed at the lower end of the side wall An elliptical recess having first and second line symmetry axes perpendicular to each other when viewed from above, with a portion of the bottom of the pan being recessed downward, and the first line symmetry axis on the first line symmetry axis Place the first width, which is the length of the recess A second diameter which is equal to or larger than the diameter of the heating coil and is within the above-described range of the induction heating cooker and is the length of the concave portion on the second line-symmetric axis. For induction heating in which the width of the pot is made shorter than the first width and the elliptical shape is formed to change the natural frequency of the bottom of the pan to make it difficult to generate noise during induction heating. pot. An induction heating pan that is mounted concentrically on a substantially circular heating coil when viewed from above and is provided in combination with a predetermined induction heating cooker that is induction heated by flowing a high-frequency current through the heating coil. The clad material is composed of a heat generating layer made of magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. A substantially circular pan bottom as viewed from above, comprising a main body formed into a shape having a substantially circular upper opening when viewed from above, a side wall forming the opening, and a pan bottom formed at the lower end of the side wall A portion of the bottom of the pan that protrudes downward and has an elliptical substantially annular convex portion having first and second line symmetry axes perpendicular to each other when viewed from above, the first line symmetry It is the length outside the convex part on the axis. The first width is set to be equal to or larger than the approximate diameter of the heating coil having a predetermined diameter, and the first width is within the above-described range of the induction heating cooker, and the convex portion on the second axis of symmetry Generates noise during induction heating by changing the natural frequency of the bottom of the pan by making the second width, which is the outer length, shorter than the first width and making it the size that forms the elliptical shape. Induction heating pan made difficult to do. An induction heating pan that is mounted concentrically on a substantially circular heating coil when viewed from above and is provided in combination with a predetermined induction heating cooker that is induction heated by flowing a high-frequency current through the heating coil. The clad material is composed of a heat generating layer made of magnetic metal and a high heat conductive layer formed on the heat generating layer and made of a metal material having a thermal conductivity equal to or higher than that of aluminum. A substantially circular pan bottom as viewed from above, comprising a main body formed into a shape having a substantially circular upper opening when viewed from above, a side wall forming the opening, and a pan bottom formed at the lower end of the side wall A portion of the bottom of the pan that is recessed downward and has an elliptical substantially annular recess having first and second line symmetry axes perpendicular to each other when viewed from above, the first line symmetry axis On the outside length of the recess The first width is set to be equal to or larger than the approximate diameter of the heating coil having a predetermined diameter, and is within the above-described range of the induction heating cooker, and the concave portion on the second line symmetry axis Generates noise during induction heating by changing the natural frequency of the bottom of the pan by making the second width, which is the outer length, shorter than the first width and making it the size that forms the elliptical shape. Induction heating pan made difficult to do.

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