JP6320670B2 - Electromagnetic cooker - Google Patents

Description

  The present invention relates to an electromagnetic cooker made of nonmagnetic material such as aluminum or aluminum alloy heated by an electromagnetic induction heater.

  2. Description of the Related Art Conventionally, there is known an electromagnetic induction heater that heats cooking utensils such as a frying pan and a pan by electromagnetic induction heating (referred to as IH from the acronym of Induction Heating). Cooking utensils such as frying pans and pans used in this electromagnetic induction heater are generally called electromagnetic cooking utensils. As shown in FIG. 13, an appliance body made of a non-magnetic material such as aluminum or aluminum alloy, and the appliance body And a metal plate made of a magnetic material joined to the bottom surface. The metal plate generates heat by electromagnetic induction, and the heat is conducted to the instrument body to heat the entire instrument. In recent years, combined with the popularity of all electrification, this electromagnetic cooker has been widely used.

And what was devised variously as this electromagnetic cooking appliance is known.
For example, in Patent Document 1, the structure of the bottom wall of an aluminum alloy container body has a three-layer structure of a magnetic metal plate embedded inside and an aluminum layer covering both surfaces of the magnetic metal plate. There is disclosed a structure in which a slit for dividing the outer bottom surface side aluminum layer is provided on the outer bottom wall surface, and a magnetic metal plate embedded from the bottom of the slit is exposed.

  In Patent Document 2, a heating element 5 made of a magnetic material is composed of eight divided plates 6, and these divided plates 6 are joined to the bottom surface of a pot body 2 made of a non-magnetic material. An IH cooking pan 1 arranged in a circle on the bottom surface is disclosed.

  Patent Document 3 is a metal plate 40 fixed to the outer surface of the bottom portion of the cooking container 30, and the metal plate 40 has a diameter of 30 mm or more and less than 70 mm with the approximate center of the bottom portion 31 of the cooking container 30 as the center. What is arrange | positioned by the annular area | region surrounding the circular area | region of this is disclosed.

  Patent Document 4 discloses a cooking utensil for an electromagnetic cooker in which a magnetic material is embedded by exposing one surface to the bottom of an aluminum alloy electromagnetic cooking utensil, and the magnetic material includes an outer band-shaped member and an inner band-shaped member. A fan-shaped perforated disk-shaped body comprising a member, a radial connecting member for connecting both belt-like members between the end portions thereof, and a sealed space surrounded by the inner and outer belt-like members and the connecting member. There has been disclosed a structure in which some of the perforated discs are integrated and embedded with an aluminum alloy in the sealed space of the perforated discs and the periphery thereof.

  Further, Patent Document 5 provides a laminated portion at the bottom of the main body portion of the cooking container for heating, and forms a plurality of exposed portions in which the material of the main body portion is exposed in the laminated portion, and the plurality of exposed portions are for heating. What formed the superposition | polymerization part superposed | polymerized planarly over the fixed range of equidistance from the bottom face center part of a cooking vessel is disclosed.

Japanese Patent No. 2558429 JP 2001-203070 A Japanese Patent Laid-Open No. 2005-205196 JP 2006-122410 A Utility Model Registration No. 3111695

  By the way, in the conventional electromagnetic cooking appliance, since the center part of the bottom wall of a cooking appliance main body deform | transforms in thickness direction by heating, it is important to control the deformation | transformation of the thickness direction of the bottom wall.

  That is, when the electromagnetic cooking utensil is placed on a heater, it is generally formed by projecting the central portion of the bottom wall of the utensil upward in the thickness direction so that the appliance does not wobble on the heater. In particular, according to the current SG standard, the protruding height of the bottom wall (the distance from the top surface of the heater to the center of the bottom wall of the appliance) when not heated is the diameter of the bottom wall of the cooking appliance x 0.6% or less. It is required to manufacture as follows.

  When the cooking device is heated by a heater, the conventional electromagnetic cooking device is deformed so that the central portion of the bottom wall protrudes further upward in the thickness direction and is separated from the top plate of the electromagnetic induction heater. It was. In particular, according to the SG standard, it is required to manufacture so that the protruding height of the bottom wall is not more than 0.5% of the diameter of the bottom wall of the cooking utensil during heating.

  For this reason, it has been a problem to control the deformation in the thickness direction of the bottom wall of the electromagnetic cooking appliance so that it passes the SG standard not only when heating but also when heating.

  The present invention has been made in view of the above-described problems, and can easily control the deformation in the thickness direction of the bottom wall of the instrument body during heating, and thus can be stably heated. The purpose is to provide an electromagnetic cooker.

  In order to achieve the above object, the present invention provides an electromagnetic cooking utensil comprising an appliance main body made of a nonmagnetic material having a wall and a peripheral wall, and a metal plate made of a magnetic material joined to the back surface of the bottom wall of the appliance main body. In the instrument body, the central portion of the bottom wall gently protrudes upward in the thickness direction when not heated, and the metal plate is divided along the circumferential direction of the bottom wall of the instrument body It is comprised from the some division | segmentation metal plate arrange | positioned by, and the recessed part is formed in the back surface of the bottom wall of the said instrument main body, It is characterized by the above-mentioned. According to this, about the deformation | transformation of the thickness direction of the bottom wall of the appliance main body at the time of a heating, it can control so that the said deformation | transformation amount may be 0.5% or less of the diameter of the bottom wall of a cooking appliance.

  The recess is generally formed in a circular shape, an elliptical shape, an oval shape, or a polygonal shape. Moreover, a recessed part may be comprised from the several dot-shaped recessed part. Moreover, the said recessed part may be formed in the back surface of the bottom wall of the said instrument main body by stamping or cutting in the aspect which protrudes from the surface of the said division | segmentation metal plate to the back surface side of the bottom wall of the said instrument main body. . Moreover, the said recessed part may be formed in the aspect which straddles the clearance gap between the said adjacent division | segmentation metal plates. Moreover, the said recessed part may be formed inside the clearance gap between the said division | segmentation metal plates adjacent.

  According to the present invention, the deformation in the thickness direction of the bottom wall of the appliance body during heating can be controlled so that the amount of deformation is equal to or less than the diameter of the bottom wall of the cooking appliance x 0.5%. For this reason, when cooking using this cooking utensil, it becomes possible to heat stably.

It is sectional drawing of this instrument which concerns on 1st Embodiment. It is the top view seen from the back surface side of the bottom wall of this instrument of FIG. It is an expanded sectional view of the part in which the recessed part of this instrument of FIG. 1 was formed. It is the top view seen from the back side of the bottom wall of this instrument concerning a 2nd embodiment. It is an expanded sectional view of the part in which the recessed part of this instrument of FIG. 4 was formed. It is the top view seen from the back side of the bottom wall of this instrument concerning a 3rd embodiment. It is an expanded sectional view of the part in which the recessed part of this instrument of FIG. 6 was formed. It is the top view seen from the back side of the bottom wall of this instrument concerning a 4th embodiment. It is an expanded sectional view of the part in which the recessed part of this instrument of FIG. 8 was formed. It is the top view seen from the back side of the bottom wall of this instrument concerning a 5th embodiment. It is an expanded sectional view of the part in which the recessed part of this instrument of FIG. 10 was formed. It is the structure schematic for showing the dimension of this instrument. It is the top view seen from the back surface side of the bottom wall of the conventional electromagnetic cooking appliance.

<Embodiment 1>
Next, the electromagnetic cooking appliance (henceforth this appliance 1) which concerns on embodiment of this invention is demonstrated.

  FIG. 1 is a cross-sectional view of the instrument 1, FIG. 2 is a plan view seen from the back side of the bottom wall of the instrument 1, and FIG. 3 is an enlarged cross-sectional view of a portion where the recess of the instrument 1 is formed.

  The instrument 1 is a frying pan having a circular shape in plan view that is placed on a top plate of an electromagnetic induction heater (IH) (not shown) and heated by electromagnetic induction.

  In general, an induction coil is spirally disposed below a top plate of an electromagnetic induction heater, and a high-frequency current generator is disposed below the induction coil. When a high-frequency current is supplied from the high-frequency current generator to the induction coil, magnetic lines of force are generated so as to cross a later-described metal plate 200 of the instrument 1, and an eddy current is generated inside the metal plate 200. The eddy current is converted into Joule heat, so that the metal plate 200 generates heat and heats the instrument 1.

  As shown in FIGS. 1 and 2, the instrument 1 includes an instrument body 100 made of a nonmagnetic material such as an aluminum alloy, a copper alloy, a magnesium alloy, or a ceramic. The instrument main body 100 is composed of a bottom wall 110 having a circular shape in plan view and a peripheral wall 120 that stands gently upward from the peripheral edge of the bottom wall 110, and has an opening diameter of 260 mm and a depth of 60 mm, for example. In general, it is formed in a vessel shape having a top opening with a thickness of 3 mm, and is formed by pressing from a single plate. However, in the case of ceramic, it may be performed by another forming method.

  Moreover, the center part of the bottom wall 110 of the instrument main body 100 is formed so as to protrude upward in the thickness direction when not heated. The protruding height at this time is preferably 0.6% or less of the diameter of the bottom wall 110 of the instrument body 100 so as to conform to the SG standard. Thus, by projecting upward in the thickness direction during non-heating, the instrument 1 can be stably placed on the top plate of the electromagnetic induction heater. Note that since the protrusion height is actually very low, the protrusion height is not expressed in FIG. 1, but FIG. 12 schematically shows the state.

  A metal plate 200 made of a magnetic material such as iron or magnetic stainless steel is joined to the bottom wall 110 of the instrument main body 100 over almost the entire surface. When joining the metal plate 200, in general, without using an adhesive or the like, the bottom wall 110 of the instrument body 100 and the metal plate 200 are often joined together by press working. However, in the case of ceramic, it may be performed by another joining method.

  As shown in FIG. 2, the metal plate 200 is composed of eight substantially fan-shaped divided metal plates 210, and the divided metal plates 210 are evenly arranged along the circumferential direction of the bottom wall 110 of the instrument body 100. ing.

  The division in the present embodiment refers to a state in which each divided metal plate 210 is not completely divided, but is connected to each other at the peripheral or central portion of the bottom wall 110 of the instrument body 100. For this reason, each divided metal plate 210 is in an O-type state in which the peripheral edge portion and the central portion are alternately connected along the circumferential direction of the bottom wall 110 of the instrument main body 100.

  Each divided metal plate 210 is provided with a plurality of small holes 210a having a diameter of 4 mm over the entire surface. The small holes 210a are intended to ensure that the burrs of the small holes 210a are indented into the bottom wall 110 of the appliance main body 100 during bonding, and are also used in conventional electromagnetic cooking appliances.

  Moreover, the circular recessed part 310 with a diameter of 10-20 mm is formed in the back surface of the bottom wall 110 of the instrument main body 100, for example. Specifically, among the eight divided metal plates 210, the surface of one divided metal plate 210 is stamped in a manner protruding from the surface to the back surface side of the bottom wall 110 of the instrument body 100. As shown in FIG. 3, a recess 310 is formed on the back surface of the bottom wall 110 of the instrument main body 110. When the surface of the divided metal plate 210 is engraved in such a manner that it protrudes to the back side of the bottom wall 110 of the instrument body 100, a concave portion 311 is formed on the surface of the divided metal plate 210 as well as the concave portion 310, These recesses 310 and 311 are recessed in the same shape while being in close contact with each other.

  Thus, when the instrument 1 is heated by the electromagnetic induction heater, the metal plate 200 generates heat according to the principle of electromagnetic induction heating described above, and the heat is conducted to the instrument body 100 to heat the entire instrument body 100. . At this time, although stress is applied to the instrument main body 100 and the metal plate 200 by heating, the central portion of the bottom wall of the instrument main body 100 does not greatly deform in the thickness direction, and the bottom wall of the instrument main body 100 conforms to the SG standard. It becomes 0.5% or less of the diameter.

  The reason why the amount of deformation in the thickness direction of the bottom wall of the instrument body during heating can be controlled to be small is considered as follows.

  First, since the instrument main body 100 and the metal plate 200 are two-dimensional structures on a plane, the expansion coefficient becomes the square of the expansion coefficient of the linear one-dimensional structure when heated. It will expand in two dimensions. However, when the recesses 310 are formed as in the present invention, the portion surrounded by the recesses 310 is in a state close to a one-dimensional structure, and the expansion is also considered to be close to one-dimensional and reduced.

  Second, at the initial stage of heating, the resistance of the instrument main body 100 is low, and the metal plate 200 is stretched relatively smoothly, so that it is pulled to the heating side (top plate side). Thereafter, it is considered that when the heat is conducted from the metal plate 200 to the instrument body 100, the metal plate 200 resists so that the instrument body 100 does not extend too much, and finally the overall elongation can be suppressed.

  Thirdly, it is considered that the concave portion 310 becomes a stress absorbing portion of the instrument main body 100 or the metal plate 200, and the swelling of the central portion of the instrument main body 100 can be suppressed.

  Fourth, a portion with high pressure bonding is formed between the instrument main body and the divided metal plate 210 in which the recess 310 is formed, while pressure bonding is performed between the instrument main body and the divided metal plate 210 in which the recess 310 is not formed. The strong part is not formed and remains normal, so that pressure bonding strength is configured between the instrument main body 100 and each divided metal plate 210, and a large deformation in the thickness direction at the center of the instrument main body 100 is suppressed. It is thought that there is.

  The reason why the central portion of the instrument body 100 is not greatly deformed in the thickness direction by forming the predetermined recess 310 in the instrument body 100 is that the metal plate 200 is divided into a plurality of divided metal plates 210 in the circumferential direction. Limited to

<Embodiment 2>
Next, the electromagnetic cooking appliance (henceforth this utensil 2) which concerns on the 2nd Embodiment of this invention is demonstrated.

  FIG. 4 is a plan view seen from the back side of the bottom wall of the instrument 2, and FIG. 5 is an enlarged cross-sectional view of a portion where the recess of the instrument 2 is formed.

  In the present embodiment, each of the divided metal plates 210 is alternately connected at the peripheral edge portion and the central portion along the circumferential direction of the bottom wall 110 of the instrument main body 100, but a part (the outermost portion of the divided metal plate 210 in FIG. The lower part is in a C-type state that is not connected.

  Moreover, in this embodiment, the three recessed parts 320 of the dot shape (small circle shape in this embodiment) of diameter 3-8mm are formed in the back surface of the bottom wall 110 of the instrument main body 100, for example. These recesses 320 are formed in a straight line along the radial direction of the bottom wall 110 of the instrument body 100 on the surface of the divided metal plate 210. Specifically, among the eight divided metal plates 210, the surface of one divided metal plate 210 is stamped in a manner protruding from the surface to the back surface side of the bottom wall 110 of the instrument body 100. The recess 320 is formed on the back surface of the bottom wall 110 of the instrument body 110 so as to draw a broken line as a whole. When the surface of the divided metal plate 210 is engraved in such a manner as to protrude toward the back side of the bottom wall 110 of the instrument body 100, a concave portion 321 is formed on the surface of the divided metal plate 210 as well as the concave portion 320, These recesses 320 and 321 are recessed in the same shape while being in close contact with each other.

  In the present embodiment, the dot-shaped recesses 320 are linearly arranged in series. However, the dot-shaped depressions 320 are arranged in series in a curved line or arranged in a form that draws an outline of another shape. It may be formed in an arbitrary manner at an arbitrary position such as being formed.

<Embodiment 3>
Next, an electromagnetic cooking appliance (hereinafter referred to as the appliance 3) according to a third embodiment of the present invention will be described.

  FIG. 6 is a plan view seen from the back side of the bottom wall of the instrument 3, and FIG. 7 is an enlarged cross-sectional view of a portion where the recess of the instrument 3 is formed.

  As shown in FIGS. 6 and 7, the instrument 3 includes an instrument body 100 made of a nonmagnetic material such as an aluminum alloy, a copper alloy, a magnesium alloy, or a ceramic. This instrument body 100 is composed of a bottom wall 110 having a planar view angle shape and a peripheral wall 120 erected upward from the peripheral edge of the bottom wall 110. For example, the instrument main body 100 is 180 mm long, 150 mm wide, 30 mm deep, It is formed in a vessel shape with a top opening of 2.6mm thickness.

  Moreover, the center part of the bottom wall 110 of the instrument main body 100 is formed so as to protrude upward in the thickness direction when not heated. The protruding height at this time is preferably 0.6% or less of the vertical length of the bottom wall 110 of the instrument body 100 so as to conform to the SG standard. Thus, by projecting upward in the thickness direction during non-heating, the instrument 1 can be stably placed on the top plate of the electromagnetic induction heater.

  A metal plate 200 made of a magnetic material such as iron or magnetic stainless steel is joined to the bottom wall 110 of the instrument main body 100 over almost the entire surface. As shown in FIG. 6, the metal plate 200 is composed of six triangular divided metal plates 210, and the divided metal plates 210 are arranged substantially evenly along the circumferential direction of the bottom wall 110 of the instrument body 100. Has been. Further, each divided metal plate 210 is in an O-type state in which the peripheral edge portion and the central portion are alternately connected along the circumferential direction of the bottom wall 110 of the instrument main body 100.

  In the present embodiment, seven concave portions 330 having, for example, a dot shape (small circular shape in the present embodiment) having a diameter of 3 to 8 mm are formed on the back surface of the bottom wall 110 of the instrument main body 100. The recesses 330 are formed side by side in series along the gap 220 in such a manner as to straddle the gap 220 between the adjacent divided metal plates 210. Specifically, among the eight divided metal plates 210, the gap 220 between a pair of adjacent divided metal plates 210 is stamped on the back surface side of the bottom wall 110 of the device main body 100, thereby A recess 330 is formed on the back surface of the bottom wall 110 in a manner of drawing a broken line as a whole. In the gap 220 of the divided metal plate 210, when stamped on the back surface side of the bottom wall 110 of the instrument body 100, a concave portion 331 is formed on the surface of the edge of the divided metal plate 210 as well as the concave portion 330, These recesses 330 and 331 are recessed in close contact with each other.

<Embodiment 4>
Next, the electromagnetic cooking appliance (henceforth this appliance 4) which concerns on the 4th Embodiment of this invention is demonstrated.

  FIG. 8 is a plan view seen from the back side of the bottom wall of the instrument 4, and FIG. 9 is an enlarged cross-sectional view of a portion where the recess of the instrument 4 is formed.

  In the present embodiment, the same instrument body 100 and metal plate 200 as those in the third embodiment are used, and the back surface of the bottom wall 110 of the instrument body 100 has, for example, a dot shape having a diameter of 3 to 8 mm (in this embodiment, a small circle shape). ) Six recesses 340 are formed. The recesses 340 are formed in series along the gap 220 inside the gap 220 between the adjacent divided metal plates 210. Specifically, among the eight divided metal plates 210, the instrument main body 110 is directly stamped on the back surface side of the bottom wall 110 of the instrument main body 100 in the gap 220 between a pair of adjacent divided metal plates 210. A recess 330 is formed on the back surface of the bottom wall 110 in a manner of drawing a broken line as a whole. In the gap 220 of the divided metal plate 210, when stamped on the back side of the bottom wall 110 of the instrument body 100, the divided metal plate 210 is stamped so as not to contact the edge of the divided metal plate 210. No recess is formed on the surface of 210.

<Embodiment 5>
Next, the electromagnetic cooking appliance (henceforth this utensil 5) which concerns on the 5th Embodiment of this invention is demonstrated.

  FIG. 10 is a plan view seen from the back side of the bottom wall of the instrument 5, and FIG. 11 is an enlarged cross-sectional view of a portion where the recess of the instrument 5 is formed.

  In the present embodiment, each of the divided metal plates 210 is alternately connected at the peripheral edge portion and the central portion along the circumferential direction of the bottom wall 110 of the instrument main body 100, but a part (the outermost portion of the divided metal plate 210 in FIG. The lower part is in a C-type state that is not connected.

  In the present embodiment, nine concave portions 350 having a dot shape (small circular shape in the present embodiment) having a diameter of 3 to 8 mm are formed on the back surface of the bottom wall 110 of the instrument main body 100. These concave portions 350 are formed side by side in series in such a manner as to straddle the two gaps 220 along the direction intersecting the radial direction of the bottom wall 110 of the instrument body 100 on the surface of the divided metal plate 210. Specifically, among the eight divided metal plates 210, the surface of the three divided metal plates 210 is stamped in a manner protruding from the surface to the back surface side of the bottom wall 110 of the instrument body 100. The recess 350 is formed on the back surface of the bottom wall 110 of the instrument main body 110 so as to draw a broken line as a whole. When the surface of the divided metal plate 210 is engraved in a manner that protrudes to the back side of the bottom wall 110 of the instrument body 100, a concave portion 351 is formed on the surface of the divided metal plate 210 as well as the concave portion 350, These concave portions 350 and 351 are recessed in the same shape while being in close contact with each other.

  In the above embodiment, the concave portion is formed in a circular shape or a dot shape, but may be formed in an elliptical shape, an oval shape, or a polygonal shape. However, the entire shape formed in a linear shape extending in a straight line or curve is excluded.

  In addition, the concave portion is not limited to the whole formed in a circular shape, an elliptical shape, an elliptical shape, or a polygonal shape, and the contour may be formed in those shapes. For example, the circular concave portion is not limited to the one in which the entire concave portion is formed in a circular shape, and may be formed in a circular shape (for example, an annular shape).

  Further, the recess may be formed not only in a simple circular shape, elliptical shape, oval shape or polygonal shape itself, but also in the shape of a pattern or mark (such as a company logo) using those shapes.

  Moreover, it is preferable that the ratio of the longest diameter of the longest diameter part and the shortest diameter of the shortest diameter part of the said recessed part exists in the range of 1: 1-3: 1.

  Further, the size and number of the recesses are not limited to those described above.

  Moreover, although the recessed part shall be formed by stamping, you may form by other methods, such as cutting. However, it is preferable that there is no influence such as projecting to the surface (use surface) side of the bottom wall 110 of the instrument main body 100 regardless of the method such as stamping or cutting.

  In addition, each divided metal plate 210 is partially connected at the central portion or the peripheral portion of the instrument main body 100, but any of the divided metal plates 210 may not be connected, or any of the divided metal plates 210 may be connected. The metal plates 210 may also be completely divided from each other. In short, it is only necessary that the plurality of divided metal plates 210 be disposed in a state where a gap having a predetermined length and a width is provided along the circumferential direction of the bottom wall 110 of the instrument body 100.

  Each divided metal plate 210 is formed in a substantially fan shape, but may be formed in other shapes.

  Moreover, although the example which applied this instrument to the circular pan of planar view was demonstrated, the frying pan of another shape may be sufficient and cooking utensils other than a frying pan may be sufficient.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  Next, an example of the appliance will be described in comparison with a conventional electromagnetic cooking appliance. In addition, in a present Example, oil is put in each appliance and it implements in the same environment as an actual cooking spot.

  In this embodiment, as shown in FIG. 12, L, X, Y, and Z are defined as follows. In FIG. 12, for convenience of explanation, the protrusion height X is expressed higher than the actual protrusion height.

L: Diameter of the bottom wall of the instrument body 100 X: Projection height of the bottom wall when not heated (distance from the top plate T to the center of the outer surface of the bottom wall)
Y: Amount of height change during heating (height changed from the position of the central portion A of the outer surface of the bottom wall when not heated by heating)
Z: Projection height of bottom wall during heating (distance from top plate T to center A of bottom wall outer surface)

<Conventional device>
As shown in FIG. 13, the conventional instrument 10 is a marble-coated frying pan having a bottom wall 110 with a diameter of 200 mm and a thickness of 2.6 mm. The bottom wall 110 of the instrument body 100 has a stainless steel diameter of 176 mm and a thickness of 0. A 5 mm metal plate 200 is joined. The metal plate 200 is composed of eight divided metal plates 210. Note that the bottom wall 110 of the instrument body 100 is not formed with any recess according to the present invention.

  The protrusion height X of the conventional instrument 10 when not heated is 1.00 mm, which is 0.6% (1.2 mm) or less of the diameter of the bottom wall, and conforms to the SG standard.

The conventional instrument D is gradually heated, and when the amount of change in height Y at 50 ° C. (Y50), 100 ° C. (Y100), 150 ° C. (Y150), and 200 ° C. (Y200) during heating is taken, It becomes as Table 4.

  The height change amount Y200 at 200 ° C. at the time of maximum heating is 2.30 mm on the upper side in the thickness direction. Therefore, the protruding height Z of the bottom wall is 3.30 mm obtained by adding the height change amount Y200 (2.30 mm) to the protruding height X (1.00 mm) when not heated. This is 0.5% (1.0 mm) or more of the diameter of the bottom wall and does not conform to the SG standard.

<Apparatus A>
As shown in FIG. 2, the instrument A corresponds to the first embodiment, and is a frying pan having a bottom wall 110 with a diameter of 176 mm and a thickness of 3 mm. The bottom wall 110 of the instrument body 100 has a stainless steel diameter. A metal plate 200 having a thickness of 176 mm and a thickness of 0.50 mm is joined. The metal plate 200 includes eight divided metal plates 210 divided in the circumferential direction. Moreover, the bottom wall 110 of this instrument is formed with a recess having a diameter of 12 mm and a depth of 1 mm.

  The protrusion height X of the instrument when not heated is 0.35 mm, which is 0.6% (1.05 mm) or less of the diameter of the bottom wall, and conforms to the SG standard.

When this instrument is gradually heated and the height change amount Y at 50 ° C. (Y50), 100 ° C. (Y100), 150 ° C. (Y150), and 200 ° C. (Y200) during heating is taken, 2 is as follows.

  A height change amount Y200 at 200 ° C. at the time of maximum heating is 0.30 mm on the upper side in the thickness direction. Therefore, the protruding height Z of the bottom wall is 0.65 mm obtained by adding the height change amount Y200 (0.30 mm) to the protruding height X (0.35 mm) when not heated. This is 0.5% (0.88 mm) or less of the diameter of the bottom wall and conforms to the SG standard.

<Apparatus B>
As shown in FIG. 4, the instrument B corresponds to the second embodiment, is a frying pan having a diameter of the bottom wall 110 of 180 mm and a thickness of 3 mm, and the bottom wall 110 of the instrument body 100 has a stainless steel diameter. A metal plate 200 having a thickness of 180 mm and a thickness of 0.45 mm is joined. The metal plate 200 includes eight divided metal plates 210 divided in the circumferential direction. In addition, on the bottom wall 110 of the present instrument, three dot-shaped concave portions having a diameter of 5 mm and a depth of 1.5 mm are formed in series in the radial direction.

  The protrusion height X of the instrument when not heated is 1.00 mm, which is 0.6% (1.08 mm) or less of the diameter of the bottom wall, and conforms to the SG standard.

When this instrument is gradually heated and the height change amount Y at 50 ° C. (Y50), 100 ° C. (Y100), 150 ° C. (Y150), and 200 ° C. (Y200) during heating is taken, As shown in 3.

  The amount of change in height Y200 at 200 ° C. during maximum heating is 0.35 mm on the lower side in the thickness direction. Therefore, the protrusion height Z of the bottom wall is 0.65 mm obtained by subtracting the height change amount Y200 (0.35 mm) from the protrusion height X (1.00 mm) when not heated. This is 0.5% (0.90 mm) or less of the diameter of the bottom wall and conforms to the SG standard.

<Apparatus C>
As shown in FIG. 6 or FIG. 8, this instrument C corresponds to the third or fourth embodiment, and is a square frying pan having a length of 180 mm, a width of 150 mm, and a thickness of 3 mm. A metal plate made of stainless steel having a length of 180 mm, a width of 150 mm, and a thickness of 0.5 mm is joined to the bottom wall 110. The metal plate 200 includes six divided metal plates 210 divided in the circumferential direction.

  When seven dot-shaped recesses 330 having a diameter of 5 mm and a depth of 1.5 mm are formed across the gap 220 of the divided metal plate 210 as shown in FIG. Even if a rolling test was performed, it conformed to the SG standard.

  In addition, as shown in FIG. 8, six dot-shaped recesses 340 having a diameter of 4 mm and a depth of 1.5 mm are formed on the bottom wall 110 of the instrument inside the gap 220 of the divided metal plate 210. Even if an empty test was conducted, it was compatible with the SG standard.

  Then, a total of 13 dot-shaped concave portions 330 having seven diameters of 5 mm and a depth of 1 mm shown in FIG. 6 and six dot-shaped concave portions 340 having a diameter of 5 mm and a depth of 1.5 mm shown in FIG. Verification was performed on the device C in which a recess is formed.

  The protrusion height X of the instrument when not heated is 0.250 mm, which is not more than 0.6% (0.88 mm) of the diameter of the bottom wall, and conforms to the SG standard.

When this instrument is gradually heated and the height change amount Y at 50 ° C. (Y50), 100 ° C. (Y100), 150 ° C. (Y150), and 200 ° C. (Y200) during heating is taken, As shown in 4.

  The amount of change in height Y200 at 200 ° C. during maximum heating is 0.20 mm on the lower side in the thickness direction. Therefore, the protruding height Z of the bottom wall is 0.45 mm obtained by adding the height change amount Y200 (0.20 mm) to the protruding height X (0.25 mm) when not heated. This is 0.5% (0.74 mm) or less of the length of the bottom wall and conforms to the SG standard.

<Apparatus D>
As shown in FIG. 10, the instrument D corresponds to the fifth embodiment, and is a frying pan having a diameter of the bottom wall 110 of 180 mm and a thickness of 3 mm, and the bottom wall 110 of the instrument body 100 is made of stainless steel. A metal plate 200 having a thickness of 180 mm and a thickness of 0.45 mm is joined. The metal plate 200 includes eight divided metal plates 210 divided in the circumferential direction. In addition, a dot-shaped recess 350 having a diameter of 5 mm and a depth of 1.5 mm is formed on the bottom wall 110 of the instrument in such a manner as to straddle the three divided metal plates 210.

  The protrusion height X of the instrument when not heated is 0.80 mm, which is 0.6% (1.08 mm) or less of the diameter of the bottom wall, and conforms to the SG standard.

When this instrument is gradually heated and the height change amount Y at 50 ° C. (Y50), 100 ° C. (Y100), 150 ° C. (Y150), and 200 ° C. (Y200) during heating is taken, As shown in 5.

  The height change amount Y200 at 200 ° C. at the time of maximum heating is 0.47 mm on the lower side in the thickness direction. Therefore, the protruding height Z of the bottom wall is 0.33 mm obtained by subtracting the height change amount Y200 (0.47 mm) from the protruding height X (0.80 mm) when not heated. This is 0.5% (0.90 mm) or less of the diameter of the bottom wall and conforms to the SG standard.

DESCRIPTION OF SYMBOLS 1 ... This instrument 100 ... Instrument main body 110 ... Bottom wall 120 ... Perimeter wall 200 ... Metal plate 210 ... Divided metal plate 310, 311 ... Concave part

Claims (5)

An electromagnetic cooking utensil comprising an appliance body made of a non-magnetic material having a bottom wall and a peripheral wall, and a metal plate made of a magnetic material joined to the back surface of the bottom wall of the appliance body,
The instrument body gently protrudes upward in the thickness direction when the center of the bottom wall is not heated,
The metal plate is composed of a plurality of divided metal plates arranged in a state of being divided along the circumferential direction of the bottom wall of the instrument body,
A dot-shaped recess is formed on the back surface of the bottom wall of the instrument body ,
The said recessed part is comprised from the several dot-shaped recessed part arranged in series, The electromagnetic cooking appliance characterized by the above-mentioned.   The electromagnetic cooking appliance according to claim 1, wherein the recess is formed in a circular shape, an elliptical shape, an oval shape, or a polygonal shape. 3. The electromagnetic wave according to claim 1 , wherein the concave portion is formed on a back surface of the bottom wall of the instrument body in a form protruding from a surface of the divided metal plate to a back surface side of the bottom wall of the instrument body. kitchenware. The said recessed part is an electromagnetic cooking appliance of Claim 1 thru | or 3 currently formed in the aspect over the clearance gap between the said division | segmentation metal plates adjacent. The electromagnetic cooking appliance according to claim 1 , wherein the recess is formed inside a gap between the adjacent divided metal plates.