TWI762692B - Cooking device - Google Patents

Abstract

The present invention relates to a cooker, which can effectively suppressing vibration of a ferrite core. The cooker (rice cooker (10)) includes a ferrite holder (25) disposed on an outer side of a pot accommodating portion (18). An annular coil (22) is held between the ferrite holder (25) and the pot accommodating portion (18). The ferrite holder (25) includes a ferrite accommodating portion (27) for accommodating and holding a ferrite core (24). The ferrite accommodating portion (27) includes: a pair of side pates (29) disposed on both sides of the ferrite core (24); a connecting portion (30) for connecting the pair of side plates (29); an insertion opening (21) arranged at an end of the side plate in a longitudinal direction; an elastic piece (34b) that elastically urges the ferrite core (24) toward the connecting portion (30); and a restriction portion (35b) that restricts elastic deformation of the elastic piece (34b).

Description

cooker

The present invention relates to a cooker.

There is known a cooker in which a coil for inductively heating a pan and a ferrite holder for accommodating a ferrite core are arranged on the outside of a pan accommodating portion. The ferrite holder described in Patent Document 1 includes a groove-shaped ferrite accommodating portion having a pair of side plates. The ferrite accommodating portion includes: a receiving portion provided on the inner side of the ferrite accommodating portion where the coil is located; and a spring portion provided on the outer side of the ferrite accommodating portion at a position away from the coil. A ferrite core is elastically held between the receiving portion and the spring portion.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2005-27965

In view of this, our inventors have devoted themselves to further research, and started to carry out research and development and improvement, hoping to solve the above problems with a better design, and after continuous experiments and modifications, the present invention has come out.

The problem to be solved by the invention

In such a cooker, when a high-frequency magnetic field is generated by energization to the coil, the ferrite core may vibrate finely to generate abnormal noise. However, in the cooker of Patent Document 1, the anti-vibration measures of the ferrite core are not sufficient.

An object of the present invention is to provide a cooker capable of effectively suppressing vibration of a ferrite core.

means of solving problems

One aspect of the present invention provides a cooker including: a bottomed cylindrical pot accommodating portion; and a ferrite holder disposed outside the pot accommodating portion and held between the pot accommodating portion and the pot accommodating portion an annular coil, and the ferrite holder includes a ferrite accommodating portion for accommodating and holding a columnar ferrite core, and the ferrite accommodating portion includes an insertion opening for supplying the ferrite core. a body magnetic core; and an elastic piece provided on the side of the pot accommodating portion and elastically biasing the ferrite core, the elastic piece having a restricting portion that passes through contact with the pot The elastic deformation of the elastic piece is restricted by the contact of the accommodating portion or the coil.

According to this cooker, the elastic deformation of the elastic piece can be restricted by the restricting portion being in contact with the pan accommodating portion or the coil. Thereby, the movement of the ferrite core in the ferrite housing portion can be effectively suppressed by the elastic piece. Therefore, it is possible to effectively suppress the vibration of the ferrite core due to the high-frequency magnetic field generated by the energization of the coil. As a result, the generation of unexpected abnormal noise from the ferrite core can be reliably prevented.

The insertion opening is provided at one end side in the longitudinal direction of the ferrite housing portion, and the elastic piece includes a first elastic piece that faces the insertion opening from the one end side where the insertion opening is formed. and a second elastic piece extending from the other end side toward the one end side so as to oppose the first elastic piece, the restricting portion being provided on the first elastic piece The sheet is opposed to the second elastic sheet and protrudes toward the coil. According to this aspect, the ferrite core can be housed in the ferrite housing portion in a stable state while suppressing the vibration of the ferrite core.

The restricting portion provided on the second elastic piece is inclined in a direction approaching the insertion port. According to this aspect, when the ferrite core is placed in the ferrite housing portion from the insertion port, when the ferrite core collides with the restriction portion, the elastic piece is elastically deformed by the inclination of the restriction portion. Therefore, the workability of arranging the ferrite core in the ferrite housing portion can be improved. In addition, when the restricting portion is in contact with the coil due to the deformation of the elastic piece, at least one of the elastic piece and the restricting portion is deformed in a direction in which the inclination angle of the restricting portion with respect to the elastic piece increases. damage.

A stopper for preventing the inserted ferrite core from coming out is provided in the insertion port. According to this aspect, it is possible to effectively prevent the ferrite core from coming out of the ferrite accommodating portion. Therefore, the ferrite core can be handled as a component pre-assembled in the ferrite holder. As a result, the assemblability of the cooker can be improved.

The thickness from the outer surface to the inner surface of the ferrite core has a prescribed tolerance, and the ferrite core of the smallest size within the tolerance is inserted into the ferrite core from the insertion port In the accommodating portion, the gap between the outer surface of the pan accommodating portion or the coil and the restricting portion is zero when the elastic sheet is deformed to the maximum by the ferrite core. Here, the zero clearance means the state in which the restricting portion is in contact with the outer surface of the coil, and when the coil is not arranged, the tip of the restricting portion is located in the ferrite housing beyond the imaginary plane where the outer surface of the coil is located. state on the side. According to this aspect, the vibration of the ferrite core can be effectively suppressed while the assemblability of the ferrite core is ensured.

The cooker includes a reflector that is disposed outside the ferrite holder and has a shape that covers the coil when viewed from a direction extending from an axis of the pot accommodating portion, and the ferrite A plurality of body accommodating parts are provided so as to protrude radially with the center of the coil as the center, and at least one space between the adjacent plurality of the ferrite accommodating parts is provided with a space corresponding to the The shape of the reflector plate corresponds to the contour of the support plate. According to this aspect, since the reflector is in contact with the support plate, it is possible to effectively suppress the reflector from vibrating due to a high-frequency magnetic field generated by energization to the coil. As a result, the generation of unexpected abnormal noise from the reflector can be reliably prevented. In addition, the support plate can prevent the operator's hand and the lead wire of the coil from hitting the edge of the reflector. Therefore, injury to the operator and damage to the lead wire can be effectively prevented.

The ferrite holder includes: a first threaded fixing portion fixed to the pot accommodating portion; a second threaded fixing portion fixed to the pot accommodating portion together with the reflector plate; and a third threaded fixing portion part, which fixes the reflector. According to this aspect, the coil and the ferrite holder can be fixed to the outside of the pot accommodating portion by arranging the ferrite holder outside the coil arranged in the pot accommodating portion and screwing the first screw fixing portion. By arranging the lead wires of the coil in the state where the reflector plate is not arranged, injury to the operator and damage to the lead wire caused by the reflector plate can be effectively prevented. After that, by arranging a reflector on the outer side of the ferrite holder, and screwing the second screw fixing portion, the ferrite holder and the reflector can be fixed to the pot accommodating portion. Finally, by screwing the third screw fixing portion, the ferrite holder and the reflector can be fixed.

Invention effect

In the cooker of the present invention, since the elastic deformation of the elastic piece can be restricted by the contact of the restricting portion with the pan storage portion or the coil, movement of the ferrite core in the ferrite storage portion can be effectively suppressed. Therefore, the vibration of the ferrite core due to the high-frequency magnetic field generated by the energization of the coil can be effectively suppressed, and the occurrence of unexpected abnormal noise can be prevented.

With regard to the technical means of our inventors, several preferred embodiments are hereby described in detail below with the accompanying drawings, so as to provide for an in-depth understanding and approval of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Outline of Rice Cooker)

FIG. 1 and FIG. 2 show the rice cooker 10 which is an example of the cooker which concerns on embodiment of this invention. This rice cooker 10 is provided with the rice cooker main body 14 in which the rice cooker 12 is detachably arranged, and a lid body 55 attached to the rice cooker main body 14 so as to be openable and closable.

As shown in FIGS. 1 and 2, the rice cooker 12 has a bottomed cylindrical shape, and includes a disk-shaped bottom portion 12a, a cylindrical outer peripheral portion 12b, and a continuous curved portion 12c. The rice cooker 12 is made of a magnetic material, and is an integral structure in which the bottom portion 12a, the outer peripheral portion 12b, and the curved portion 12c are formed by press working or casting.

The rice cooker main body 14 is provided with the main body exterior body 15 whose upper end is opened, and the shoulder body 16 which closes the opening of the main body exterior body 15 . The back of the shoulder body 16 is provided with a hinge connection part 17 to which the cover body 55 is rotatably mounted. The rice cooker main body 14 is provided with the pot accommodating part 18 which accommodates the rice cooking pot 12 detachably. The pot accommodating portion 18 has a bottomed cylindrical shape, and includes: a metal inner case 19 formed in a cylindrical shape; and a protective frame 20 made of resin (non-conductive material) formed in a tray shape. at the lower part of the opening of the shoulder body 16 .

A coil 22 for inductively heating the rice cooker 12 is arranged outside the protective frame 20 . Referring to FIGS. 3 and 4 , in the present embodiment, three coils 22 are arranged at intervals along the circumferential direction of the protective frame 20 . A ferrite holder 25 is arranged outside each coil 22 , and the coil 22 is held between the ferrite holder 25 and the protective frame 20 . A reflector 45 is arranged on the outer side of each ferrite holder 25 , and the reflector 45 prevents leakage of the high-frequency magnetic field to the outside of the rice cooker body 14 . In addition, FIG. 4 shows that the ferrite holder 25 and the reflector 45 are arranged in one of the three coils 22 , only the ferrite holder 25 is arranged in the other, and no ferrite is arranged in the remaining one. The body holder 25 is also in a state in which the reflector 45 is not arranged.

As shown in FIGS. 1 and 2 , the lid body 55 includes a lid body 56 having a plan view shape covering the upper surface of the shoulder body 16 , and a lid exterior body 57 covering the upper portion of the lid body 56 . The cover main body 56 is rotatably attached to the hinge connection portion 17 . An inner lid 58 for closing the upper end opening of the rice cooker 12 is provided on the inner side of the lid body 56 facing the rice cooker 12 . The inner cover 58 may be detachably arranged with respect to the cover body 55 or may be arranged in a non-detachable manner.

Referring to FIG. 3 , the cover body 55 is provided with an operation panel portion 59 having a plurality of operation buttons 60 and a liquid crystal panel (display portion) 61 . The plurality of operation buttons 60 include a rice cooking button for starting the rice cooking process, a keep warm button for starting the heat preservation process, and a cancel button for ending the rice cooking process and the heat preservation process. The liquid crystal panel 61 displays the selection state of the rice cooking menu and the current operation state according to the instruction of the control unit.

3 and 4, the control board 52 is arrange|positioned in the rice cooker main body 14 so that it may be located between the main body exterior body 15 and the pot accommodating part 18. As shown in FIG. The control board 52 is provided with a control unit (not shown) that controls electrical components including the coil 22 . The control unit is constituted by a single or a plurality of microcomputers and other electronic devices. The control part controls energization to the coil 22 based on the detection result of the temperature sensor which is not shown in figure, and performs a rice cooking process and a heat retention process.

When the coil 22 is energized, the reflector 45 and the ferrite core 24 in the ferrite holder 25 may vibrate finely due to the high-frequency magnetic field generated by the coil 22 to generate abnormal noise. In order to solve this problem, in the present embodiment, the ferrite holder 25 is provided with a structure for suppressing the vibration of the ferrite core 24 and the reflector 45 . Hereinafter, the coil 22, the ferrite holder 25, and the reflector 45 will be described in more detail.

(Coil holding structure of ferrite cage)

As shown in FIGS. 4 to 6 , the coil 22 has a shape in which a plurality of coils are wound in an elliptical ring shape, and generates an eddy current by energizing a high-frequency current, thereby inductively heating the rice cooker 12 . As most clearly shown in FIG. 4 , when viewed from the direction extending from the axis A of the protective frame 20 , the coils 22 are arranged at intervals in the circumferential direction with the axis A of the protective frame 20 as the center. 1 and 5, each coil 22 is arrange|positioned on the outer side of the protective frame 20 so that it may extend from the bottom part 12a to the outer peripheral part 12b with the curved part 12c of the rice cooker 12 as a center. In addition, the bottom wall portion 20b of the protective frame 20 corresponds to the bottom portion 12a of the rice cooker 12, the curved wall portion 20c of the protective frame 20 corresponds to the curved portion 12c of the rice cooker 12, and the side wall portion 20d of the protective frame 20 corresponds to the The outer peripheral part 12b of the rice cooker 12 corresponds.

Each coil 22 includes a pair of lead wires 22a. The lead wire 22 a of the coil 22 located on the lower side in FIG. 4 is connected to the control board 52 . The lead wires 22 a of the two coils 22 located on the upper side in FIG. 4 are respectively connected to the relay substrate 53 , and the relay substrate 53 is arranged in the holder portion 20 a of the protective frame 20 . By the control unit, any one of the three coils 22 is energized, and the energization to the remaining two is cut off. In addition, the three coils 22 are switched in the energized state in a predetermined order at predetermined time intervals.

Normally, in Japan, the power distribution board installed in a home is often 20 amps, and the socket is 15 amps. In electrical equipment including this rice cooker 10, the maximum rated power that can be input per unit time is 1500W. . In the case of a rice cooker using one coil covering the entire bottom wall portion 20b, the entire bottom portion 12a of the rice cooker 12 is induction-heated by a heating amount corresponding to the rated power. On the other hand, in the rice cooker 10 of the present embodiment, since the rated power is input to one of the three coils 22, the area of 1/3 of the corresponding rice cooker 12 is concentrated by the heating amount corresponding to the rated power. Induction heating is performed. Therefore, the rice cooker 10 of this embodiment can increase the maximum heating amount per unit area of the rice cooker 12 as compared with the rice cooker using one coil.

As shown in FIGS. 4 to 6 , the ferrite holder 25 is provided for each coil 22 , and is arranged on the opposite side of the protection frame 20 with respect to the coil 22 . The ferrite holder 25 includes a plurality of ferrite accommodating portions 27 for accommodating and holding the ferrite core 24 , which converges the magnetic flux from the coil 22 . In the present embodiment, four ferrite accommodating portions (hereinafter, abbreviated as “accommodating portions”) 27 are provided to protrude radially around the center of the coil 22 so as to have a substantially cross shape in plan view. In addition, in the following description, the four accommodating parts 27 may be distinguished as needed, and may be called the 1st accommodating part 27A - the 4th accommodating part 27D.

The first accommodating portion 27A extends from the vicinity of the axis A of the protective frame 20 in the radial direction along the bottom wall portion 20b. Referring to FIG. 4 , the outer end of the first accommodating portion 27A located on the radially outer side of the protective frame 20 constitutes the base portion (center portion) 26 of the ferrite holder 25 . The base portion 26 is located on the curved wall portion 20 c of the protective frame 20 and substantially directly below the center of the coil 22 . The top end (inner end) 28 of the first accommodating portion 27A on the radially inner side of the protective frame 20 is located at the top end in the short-diameter direction of the coil 22 .

The second accommodating portion 27B extends from the base portion 26 along the side wall portion 20d of the protective frame 20 . The second accommodating portion 27B is inclined so as to gradually expand outward in the radial direction of the protective frame 20 as it goes upward along the axis A of the protective frame 20 . Referring to FIGS. 4 and 5 , the distal end (upper end) 28 of the second housing portion 27B at a position away from the base portion 26 is the coil located on the opposite side of the tip 28 of the first housing portion 27A in the short-diameter direction of the coil 22 . 22 on top.

The third accommodating portion 27C and the fourth accommodating portion 27D protrude from the base portion 26 in a direction intersecting with the first accommodating portion 27A. The third accommodating portion 27C and the fourth accommodating portion 27D extend in the circumferential direction of the protective frame 20 along the curved wall portion 20c. The top end 28 of the third accommodating portion 27C at a position away from the base portion 26 is located at one top in the longitudinal direction of the coil 22 , and the top end 28 of the fourth accommodation portion 27D at a position away from the base portion 26 is located at the other end in the longitudinal direction of the coil 22 . a top.

In this way, the short diameter direction of the coil 22 is positioned by the first housing portion 27A and the second housing portion 27B, and the long diameter direction of the coil 22 is positioned by the third housing portion 27C and the fourth housing portion 27D.

(Ferrite core mounting structure of ferrite cage)

As shown in FIG. 5 , the accommodating portion 27 is provided at a predetermined interval with respect to the coil 22 so as to avoid contact between the ferrite core 24 and the coil 22 . As shown in FIGS. 7 and 8 , each housing portion 27 has a groove shape for housing the rectangular parallelepiped ferrite core 24 , and the pair of side plates 29 includes an outer connecting portion (connecting portion) 30 and an inner connecting portion 31 a, respectively. In addition, the accommodating parts 27A, 27C, and 27D other than the second accommodating part 27B include elastic pieces 34a, 34b and restricting parts 35a, 35b. The second accommodating portion 27B includes an elastic piece 37 different from the elastic pieces 34a and 34b.

The pair of side plates 29 have: an inner edge 29a extending along the outer wall of the protective frame 20, that is, along the bottom wall part 20b, the curved wall part 20c, and the side wall part 20d; and an outer edge 29b located outside of the inner edge 29a. The opposite side plate 29 is arranged in a direction orthogonal to the protective frame 20 . A pair of side plates 29 are opposed to each other, one of the side plates 29 covers one side surface 24 a of the ferrite core 24 , and the other side plate 29 covers the other side surface 24 a of the ferrite core 24 . The side plates 29 of the first accommodating portion 27A and the second accommodating portion 27B are constituted by one continuous flat plate. The pair of side plates 29 of the third accommodating portion 27C respectively protrudes from one of the pair of side plates 29 of the first accommodating portion 27A. The pair of side plates 29 of the fourth accommodating portion 27D respectively protrudes from the other of the pair of side plates 29 of the first accommodating portion 27A.

As shown most clearly in FIG. 7 , the outer connecting portion 30 is provided on the side of the outer edge 29 b of the side plate 29 and connects the pair of side plates 29 . The outer connecting portion 30 of the first accommodating portion 27A, the third accommodating portion 27C, and the fourth accommodating portion 27D is provided at the center in the longitudinal direction of the side plate 29 . The outer connecting portion 30 of the second accommodating portion 27B is provided at the distal end 28 of the side plate 29 in the longitudinal direction. The outer connecting portion 30 includes a plate-shaped contact piece 30 a that extends along the outer edge 29 b of the side plate 29 and protrudes into the accommodating portion 27 . In addition to the contact piece 30a, a plate-shaped contact piece 30b extending along the outer edge 29b of the side plate 29 and protruding into the accommodating portion 27 is provided at the center in the longitudinal direction of the second accommodating portion 27B. . The gap between the pair of contact pieces 30 a and the gap between the pair of contact pieces 30 b are smaller than the size between the pair of side surfaces 24 a , that is, the width of the ferrite core 24 . Referring to FIG. 5 , at the end portions in the longitudinal direction of the contact pieces 30 a and 30 b , protruding portions 30 c of semicircular cross-sectional shapes protruding toward the inside (protective frame 20 ) are provided.

As shown most clearly in FIG. 8 , the inner connecting portion 31 a is provided on the inner edge 29 a side of the side plate 29 and connects the pair of side plates 29 . The inner connecting portion 31 a is provided on the distal end 28 of the accommodating portion 27 . Further, on the base 26 side of the first accommodating portion 27A and the second accommodating portion 27B, a second inner connecting portion 31 b that connects the pair of side plates 29 is further provided. In addition, the base 26 sides of the third accommodating portion 27C and the fourth accommodating portion 27D are connected by the side plate 29 of the first accommodating portion 27A.

The cylindrical accommodating portion 27 is defined by the pair of side plates 29 , the outer connecting portion 30 , and the inner connecting portion 31 a. The distal end (one end) 28 of each housing portion 27 is an insertion opening 32 into which the ferrite core 24 is inserted. As shown in FIG. 5, in order to position the end of the ferrite core 24 in the insertion direction of the ferrite core 24, an end plate 33a is provided on the base 26 side of the first housing portion 27A, and an end plate 33a is provided on the second An end plate 33b is provided on the base 26 side of the accommodating portion 27B. The end plate 33 a is continuous with the inner connecting portion 31 b of the first housing portion 27A and the pair of side plates 29 . The end plate 33b is continuous with the end plate 33a and the pair of side plates 29 of the second housing portion 27B. In addition, in the third accommodating portion 27C and the fourth accommodating portion 27D, the positioning of the end portion of the ferrite core 24 is performed by the side plate 29 of the first accommodating portion 27A.

As shown in FIGS. 5 and 8 , the elastic pieces 34 a and 34 b are elastically directed toward the outer connecting portion 30 with respect to the ferrite cores 24 accommodated in the first accommodating portion 27A, the third accommodating portion 27C, and the fourth accommodating portion 27D. exert force. The elastic pieces 34a and 34b are adjacent to each other in the longitudinal direction of the accommodating parts 27A, 27C, and 27D (side plates 29 ), and extend so as to face each other. The first elastic piece 34 a protrudes from the insertion port 32 toward the base portion 26 , and the second elastic piece 34 b protrudes from the base portion 26 toward the insertion port 32 . The first elastic piece 34a is integrally provided on the inner connecting portion 31a. The second elastic pieces 34b of the first accommodating portion 27A are integrally provided on the inner connecting portion 31b, and the second elastic pieces 34b of the third accommodating portion 27C and the fourth accommodating portion 27D are integrally provided on the side plate 29 of the first accommodating portion 27A.

The restricting portions 35 a and 35 b are in contact with the coil 22 to restrict elastic deformation of the elastic pieces 34 a and 34 b toward the coil 22 . In addition, instead of the coil 22 , the restricting portions 35 a and 35 b may be brought into contact with the protective frame 20 . The restricting portions 35 a and 35 b are integrally provided on the elastic pieces 34 a and 34 b and protrude toward the protective frame 20 . The restricting portions 35a, 35b are provided at the opposing portions of the pair of elastic pieces 34a, 34b, ie, at the tips of the respective elastic pieces 34a, 34b, so as to be located in the central portions of the accommodating portions 27A, 27C, 27D.

The first restricting portion 35a of the first elastic piece 34a is inclined in a direction approaching the second elastic piece 34b (the base portion 26 ). The second restricting portion 35b of the second elastic piece 34b is inclined in a direction approaching the first elastic piece 34a (the insertion port 32). That is, the inclination angles α and β of the restricting portions 35a and 35b with respect to the elastic pieces 34a and 34b are obtuse angles. As best shown in Fig. 5, the inclination angle β of the second restricting portion 35b with respect to the second elastic piece 34b is larger than the inclination angle α of the first restricting portion 35a with respect to the first elastic piece 34a. Further, between the elastic pieces 34a, 34b and the restricting portions 35a, 35b, chamfered portions 36a, 36b are provided, respectively. When the ferrite core 24 having a predetermined thickness T without error is arranged, the chamfered portions 36 a and 36 b are in surface contact with the ferrite core 24 .

As shown in FIGS. 5 and 8 , the elastic piece 37 of the second housing portion 27B elastically biases the ferrite core 24 housed in the second housing portion 27B toward the outer connecting portion 30 . The elastic piece 37 is provided so as to extend in the longitudinal direction of the second accommodating portion 27B. One end of the elastic piece 37 is continuous with the inner connecting portion 31a on the distal end 28 side, and the other end of the elastic piece 37 is continuous with the inner connecting portion 31b on the base portion 26 side. An inclined portion 37 a inclined toward the outer connecting portion 30 is provided in the middle portion of the elastic piece 37 .

As shown in FIGS. 5 and 7 , stoppers 38 for preventing the ferrite cores 24 arranged inside from coming out are provided in the insertion openings 32 of the accommodating portions 27A, 27C, and 27D. The stopper 38 of the first accommodating portion 27A is continuous with the inner connecting portion 31 a and the pair of side plates 29 . The stopper 38 of the third accommodating portion 27C and the fourth accommodating portion 27D is continuous with the inner connecting portion 31 a and one of the pair of side plates 29 . Each stopper 38 protrudes outward from the inner connecting portion 31a. The protruding dimension of the stopper 38 is approximately half the width of the side plate 29 from the inner edge 29a to the outer edge 29b.

The stopper of the ferrite core 24 accommodated in the second accommodating portion 27B is not provided in the ferrite holder 25 . As shown in FIGS. 5 and 6 , the stopper 20 e of the ferrite core 24 of the second accommodating portion 27B is constituted by a protruding portion having a T-shape in plan view that protrudes from the protective frame 20 . On the outer side of the stopper 20e in the radial direction of the protective frame 20, a support portion 20f that supports the outer side of the second housing portion 27B is provided.

FIG. 9 is a cross-sectional view showing the relationship between the elastic pieces 34a and 34b of the housing parts 27A, 27C, and 27D and the second restricting part 35b and the ferrite core 24 . The width and thickness T of the ferrite core 24 are predetermined as specifications. The width of the ferrite core 24 is the dimension between the pair of side surfaces 24a. The thickness T of the ferrite core 24 is the dimension from the outer surface 24b to the inner surface 24c. The thickness T includes the allowable error (tolerance) ΔT. For example, the allowable error ΔT is ±0.3 mm of the predetermined dimension.

As shown by the dotted line in FIG. 9 , in the housing portions 27A, 27C, and 27D where the ferrite core 24 is not yet disposed, the gap S1 ratio between the elastic pieces 34a, 34b and the protruding portion 30c (contact piece 30a ) is the smallest. The thickness Tmin of the ferrite core 24 of the size is small. The gaps between the elastic pieces 37 (inclined portions 37 a ) of the second accommodating portion 27B and the contact pieces 30 a and 30 b are also set to be the same as those of the elastic pieces 34 a and 34 b.

In the accommodating parts 27A, 27C, and 27D in which the stopper 38 is provided, it is necessary to insert the ferrite core 24 obliquely from the insertion opening 32 as shown in FIG. 9 . That is, in the accommodating portions 27A, 27C, and 27D, an insertion portion is constituted by an opening portion surrounded by the end portion of the contact piece 30a on the distal end 28 side, the distal end of the stopper 38, and the outer edges 29b of the pair of side plates 29. mouth 32.

As indicated by the dotted line in FIG. 9, in the housing portions 27A, 27C, and 27D where the ferrite core 24 is not yet disposed, the gap between the second restricting portion 35b of the second elastic piece 34b and the outer surface 22b of the coil 22 S2 is set as follows. As shown by the solid line in FIG. 9 , when the ferrite core 24 of thickness Tmin is inserted from the insertion port 32 and the elastic piece 34b is deformed the most by the contact of the ferrite core 24, the gap S2 becomes set to zero. The gap S2 being zero means that the second restricting portion 35b is in contact with the outer surface 22b of the coil 22, and when the coil 22 is not arranged, including the imaginary plane where the tip of the second restricting portion 35b crosses the outer surface 22b On the other hand, it is located on the protective frame 20 side.

In this rice cooker 10, the elastic deformation of the elastic pieces 34a, 34b can be restricted by the restriction|limiting part 35a, 35b and the coil 22 contact|abutting. Thereby, the movement of the ferrite core 24 in the accommodating part 27 can be suppressed by the elastic pieces 34a, 34b. Therefore, it is possible to effectively suppress the ferrite core 24 from vibrating due to the generation of a high-frequency magnetic field caused by energization to the coil 22 . As a result, the generation of unexpected abnormal noise from the ferrite core 24 can be reliably prevented.

A pair of elastic pieces 34a, 34b are provided adjacent to each other in the longitudinal direction of the accommodating portion 27, and restricting portions 35a, 35b are provided at their opposing portions. Therefore, the ferrite core 24 can be accommodated in the accommodating portion 27 in a stable state while the vibration of the ferrite core 24 is suppressed by the pair of elastic pieces 34a and 34b.

The second restricting portion 35 b provided on the second elastic piece 34 b is inclined in a direction approaching the insertion port 32 . Therefore, when the ferrite core 24 is placed in the accommodating portion 27 from the insertion port 32, if the ferrite core 24 collides with the second restricting portion 35b, the second elastic piece 34b will be affected by the second restricting portion. The inclination of 35b is elastically deformed. As a result, the workability of arranging the ferrite core 24 in the housing portion 27 can be improved. In addition, when the second restricting portion 35b is in contact with the coil 22 due to the deformation of the second elastic piece 34b, at least one of the second elastic piece 34b and the second restricting portion 35b is opposite to the second restricting portion 35b. The elastic piece 34b is deformed in a direction in which the inclination angle β of the elastic piece 34b expands. Therefore, damage to the coil 22 by the second restricting portion 35b can be suppressed.

Since the stopper 38 is provided in the insertion port 32 , it is possible to effectively prevent the ferrite core 24 from coming out of the accommodating portion 27 . Therefore, the ferrite core 24 can be handled as an assembly preliminarily assembled to the ferrite holder 25 . As a result, the assemblability of the rice cooker 10 can be improved.

In a state where the ferrite core 24 having the thickness Tmin is inserted into the housing portion 27 from the insertion opening 32, the second restricting portion 35b abuts on the outer surface 22b of the coil 22, and the gap S2 is set so that the gap S2 becomes zero. . Therefore, while ensuring the assemblability of the ferrite core 24 , it is possible to effectively suppress the vibration and the detachment of the ferrite core 24 .

(Reflector support structure of ferrite holder)

As shown in FIGS. 7 and 8 , a reflector 45 is arranged outside the ferrite holder 25 . The reflector 45 includes a bottom plate portion 46 , a side plate portion 47 , and a stepped portion 48 . The ferrite holder 25 supports the bottom plate portion 46 by the first housing portion 27A, the third housing portion 27C, and the fourth housing portion 27D, and supports the side plate portion 47 by the second housing portion 27B. In order to suppress vibration of the bottom plate portion 46 having a large area, the ferrite holder 25 of the present embodiment is provided with a support plate 39 .

Specifically, the reflector 45 is an integral structure formed by press-processing a single metal plate. For example, the material of the reflector 45 is copper or aluminum having a lower resistance value than the rice cooker 12 . Referring also to FIG. 4 , the reflector 45 has a substantially elliptical shape covering the coil 22 when viewed from the direction extending from the axis A of the protective frame 20 .

The bottom plate portion 46 is arranged to overlap the outer sides of the first housing portion 27A, the third housing portion 27C, and the fourth housing portion 27D of the ferrite holder 25 . The outer peripheral portion 46 a of the bottom plate portion 46 has a semi-elliptical shape having substantially the same curvature as the curvature between both ends in the longitudinal direction of the coil 22 .

The side plate portion 47 is continuous with the bottom plate portion 46 via the stepped portion 48 . The entire side plate portion 47 is bent relative to the bottom plate portion 46 , and is arranged to overlap the outer side of the second accommodating portion 27B of the ferrite holder 25 . The outer peripheral portion 47 a of the side plate portion 47 has a semi-elliptical shape having substantially the same curvature as the curvature between both ends in the longitudinal direction of the coil 22 . A notch 47b is provided in a part of the outer peripheral portion 47a of the side plate portion 47 in an arc shape so as to avoid interference with other components in the assembled state.

The stepped portion 48 is a recess for avoiding interference with other components in the assembled state. The stepped portion 48 includes a first portion 48 a that is continuous with the bottom plate portion 46 and a second portion 48 b that is continuous with the side plate portion 47 . The first portion 48 a is bent with respect to the bottom plate portion 46 , and is disposed on the outer sides of the third accommodating portion 27C and the fourth accommodating portion 27D of the ferrite holder 25 , respectively. The second portion 48b is bent relative to the side plate portion 47 and the first portion 48a, and extends from the third accommodating portion 27C and the fourth accommodating portion 27D to the outside of the second accommodating portion 27B, respectively.

Four through holes 49 a to 49 d are formed in the reflection plate 45 . The first through hole 49 a is provided in the bottom plate portion 46 . The second through hole 49b is provided from the side plate portion 47 to the stepped portion 48 . The third through-hole 49c and the fourth through-hole 49d are provided to the bottom plate portion 46 from the second portions 48b on both sides of the second through-hole 49b. These through-holes 49 a to 49 d are provided to cool the coil 22 by allowing the wind of the blower fan 54 (see FIG. 4 ) to pass therethrough. In addition, the second through hole 49b has a function of protruding a part of the second accommodating portion 27B and the screw fixing portions 40 to 42 described later.

Next, as shown in FIGS. 7 and 8 , the ferrite holder 25 is provided between the first housing portion 27A and the third housing portion 27C and between the first housing portion 27A and the fourth housing portion 27D, and has The support plate 39 to which the bottom plate portion 46 abuts. The support plate 39 has a contour (outer peripheral portion 39 a ) corresponding to the shape of the outer peripheral portion 46 a of the bottom plate portion 46 of the reflection plate 45 . Specifically, as shown in FIG. 4 , the curvature of the outer peripheral portion 39 a of the support plate 39 is the same as the curvature of the outer peripheral portion 46 a of the reflection plate 45 when viewed from the direction extending from the axis A of the protective frame 20 .

The outer peripheral portion 39 a of the support plate 39 is chamfered in a semicircular shape, and the semicircular portion protrudes from the outer peripheral portion 46 a of the bottom plate portion 46 . The outer surface of the support plate 39 is a flat surface flush with the outer edge 29b of the side plate 29 of the accommodating portions 27A, 27C, 27D, and the bottom plate portion 46 of the reflector 45 is in contact with the outer surface.

In this way, since the ferrite holder 25 includes the support plate 39 abutting on the bottom plate portion 46 of the reflector plate 45, it is possible to effectively suppress the reflector plate 45 (bottom plate part 46) when vibration occurs. As a result, the occurrence of unexpected abnormal noise from the bottom plate portion 46 can be reliably prevented.

In addition, as shown in FIG. 4 , the lead wires 22 a of the coils 22 are arranged through a narrow gap between the adjacent coils 22 . At this time, when the operator's hand touches the outer peripheral portion 46a of the thin reflector 45, the operator may be injured. In addition, when the lead wire 22a hits the outer peripheral portion 46a, the lead wire 22a is damaged. However, in this embodiment, since the support plate 39 provided with the outer peripheral part 39a corresponding to the shape of the outer peripheral part 46a is provided, the said problem can be prevented effectively.

(Fixing structure of ferrite cage)

As shown in FIGS. 6 to 8 , the ferrite holder 25 includes screw fixing portions 40 to 42 for fixing. The first screw fixing portion 40 is provided to fix only the ferrite holder 25 to the protective frame 20 . The second screw fixing portion 41 is provided for fixing the ferrite holder 25 to the protective frame 20 together with the reflector 45 . The third screw fixing portion 42 is provided to fix the reflector 45 to the ferrite holder 25 .

The first screw fixing portion 40 is provided at a portion where the first accommodating portion 27A and the third accommodating portion 27C intersect. The first screw fixing portion 40 includes a recessed portion into which the head of a screw (not shown) can be accommodated, and a through hole through which the screw is inserted. In the portion of the protection frame 20 located just above the first screw fixing portion 40, there is provided a convex portion 20g to which the screw is fastened.

The second screw fixing portion 41 is provided at a portion where the first accommodating portion 27A and the fourth accommodating portion 27D intersect. The second screw fixing portion 41 includes a through hole through which a screw (not shown) is inserted. A convex portion 20h to which a screw is fastened is provided in a portion of the protection frame 20 located just above the second screw fixing portion 41 . The reflector 45 includes a protruding piece 50 protruding from the bottom plate portion 46 toward the side plate portion 47 , and a portion of the protruding piece 50 located directly below the second screw fixing portion 41 is provided with a screw hole 50 a through which a screw is inserted.

The third screw fixing portion 42 is provided on the side plate 29 of the third accommodating portion 27C so as to be adjacent to the first screw fixing portion 40 . The third screw fixing portion 42 is formed by tightening a convex portion of a screw (not shown). A screw hole 50b through which a screw is inserted is provided in a portion of the projection piece 50 of the reflector 45 located just below the third screw fixing portion 42 .

In addition, referring to FIGS. 4 and 6 , a pair of positioning protrusions 20 i for positioning the top portion of the inner circumference of the coil 22 in the longitudinal direction is provided in the protective frame 20 . In addition, referring to FIGS. 7 and 8 , the protruding piece 50 of the reflector 45 is provided with a locking piece 50 c that is locked to the outside of the first screw fixing portion 40 and the second screw fixing portion 41 .

Next, the operation of attaching the coil 22 , the ferrite holder 25 , and the reflector 45 to the protective frame 20 will be described.

The three coils 22 are arranged outside the protective frame 20 so that the convex portions 20 g and 20 h are located at the inner peripheral portion of the coil 22 . Then, the coil 22 is positioned in a predetermined direction by the positioning protrusion 20i.

Next, the ferrite holder 25 in which the ferrite core 24 is accommodated is arranged outside the coil 22, and the first screw fixing portion 40 is screwed to the convex portion 20g. Thereby, the ferrite holder 25 is preliminarily fixed to the outer side of the protective frame 20, and the coil 22 can be held at a predetermined position. In the state where the reflector 45 is not arranged, the lead wires 22a of the coil 22 are arranged at predetermined positions.

Next, the reflector 45 is arranged outside the ferrite holder 25, and the second screw fixing portion 41 of the ferrite holder 25 and the protrusion 50 (screw hole 50a) of the reflector 45 are screwed together to the protection The convex part 20h of the frame 20. Thereby, while the ferrite holder 25 is completely fixed to the protective frame 20 , the reflector 45 is preliminarily fixed to the protective frame 20 .

Finally, the protrusions 50 (screw holes 50 b ) of the reflector 45 are screwed to the third screw fixing portion 42 of the ferrite holder 25 . Thereby, the reflector 45 is completely fixed to the protective frame 20 and the ferrite holder 25 .

In this way, the ferrite holder 25 includes the three types of screw fixing portions 40 to 42 , and the arrangement of the lead wires 22 a of the coil 22 can be performed in a state where the reflector 45 is not arranged on the protective frame 20 . Therefore, injury to the operator and damage to the lead wire 22a caused by the reflector plate 45 can be effectively prevented.

(Fuse mounting structure of ferrite cage)

As shown in FIG. 8 , the ferrite holder 25 includes an arrangement portion 43 for arranging the thermal fuse 44 . The arrangement portion 43 is provided so as to be adjacent to the third accommodating portion 27C and the fourth accommodating portion 27D in the direction in which the first accommodating portion 27A protrudes. Only one of the two arrangement portions 43 is arranged with the thermal fuse 44 . The thermal fuses 44 arranged on all the ferrite holders 25 are connected in series and electrically connected to the control board 52 . The thermal fuse 44 is blown when the corresponding coil 22 is overheated, thereby cutting off the energization to all the coils 22 .

The arrangement portion 43 includes a side plate 43 a provided at a distance from the side plates 29 of the accommodating portions 27C and 27D, and an end plate 43 b provided in the direction of the insertion port 32 . The side plate 43 a extends in parallel with the side plate 29 , and its overall length is shorter than that of the side plate 29 . The end plate 43b is provided in order to prevent the thermal fuse 44 from falling off, and is provided with a groove 43c through which a lead (not shown) is inserted. The end portion of the thermal fuse 44 located on the opposite side of the end plate 43b is prevented from falling off by the side plate 29 of the first accommodating portion 27A. A rib 43d for crimping the outer periphery of the temperature fuse 44 is formed on the side plates 29 and 43a. A through hole 43e for heat dissipation is provided at the bottom of the arrangement portion 43 .

In this way, since the thermal fuse 44 is arranged in the ferrite holder 25, excessive heat generation of the coil 22 can be reliably detected, and melting loss of the resin-made protective frame 20 can be effectively prevented. In addition, since there is no need to newly install other components for mounting the thermal fuse 44, the number of components can be reduced.

In addition, the rice cooker (cooker) 10 of this invention is not limited to the structure of the said embodiment, Various changes are possible.

The ferrite holder 25 and the reflector 45 may be provided with fixed portions that suppress vibration of the reflector 45 . For example, as shown in FIG. 10 , the support plate 39 of the ferrite holder 25 may be provided with a fixing protrusion 39 b having a spherical detachment preventing portion, and a bottom plate portion 46 of the reflector 45 may be provided with an elastically deformable fixing piece. The fixing holes 46b are formed, and the bottom plate portion 46 is fixed to the support plate 39 through them. In this way, the vibration of the bottom plate portion 46 of the reflector 45 can be prevented more effectively.

The ferrite core 24 is not limited to a prismatic shape, and may be a columnar shape or a shape that is curved as a whole.

Two coils 22 may be arranged, or four or more may be arranged. In addition, only one may be arranged as the axis A and the center of the protective frame 20 . In any case, the ferrite holder 25 only needs to be provided with a plurality of accommodating portions 27 so as to protrude radially with the center of the coil 22 as the center. In addition, the plurality of accommodating portions 27 are not limited to the integral structure, and may be provided separately.

The support plate 39 of the ferrite holder 25 may be provided between the second accommodating portion 27B and the third accommodating portion 27C and between the second accommodating portion 27B and the fourth accommodating portion 27D.

Although the rice cooker 10 has been described as an example in the above-described embodiment, it is only necessary to provide a bottomed cylindrical pot accommodating portion, a coil disposed outside the pot accommodating portion, and a ferrite holder disposed outside the coil. A cooker in which a columnar ferrite core is accommodated in a ferrite holder, the present invention can be applied to any cooker, and the same action and effect can be obtained.

To sum up, the technical means disclosed in the present invention can indeed effectively solve the problems of conventional knowledge, and achieve the expected purpose and effect, and it has not been published in publications before the application, has not been used publicly, and has long-term progress. The invention referred to in the Patent Law is correct, and the application is filed in accordance with the law.

However, the above are only several preferred embodiments of the present invention, which should not limit the scope of the present invention. It should still fall within the scope of the patent of the present invention.

[Invention] 10‧‧‧Rice cooker (cooker) 12‧‧‧Rice cooker 12a‧‧‧Bottom 12b‧‧‧Outer peripheral part 12c‧‧‧Bending part 14‧‧‧Rice cooker body 15‧‧‧Main body exterior Body 16‧‧‧Shoulder body 17‧‧‧Hinged connecting part 18‧‧‧Pot receiving part 19‧‧‧Inner shell 20‧‧‧Protective frame 20a‧‧‧Retainer part 20b‧‧‧Bottom wall part 20c‧‧ ‧Curved wall part 20d‧‧‧Side wall part 20e‧‧‧Stopper 20f‧‧‧Support part 20g‧‧‧Protruding part 20h‧‧‧Protruding part 20i‧‧‧Locating protrusion 22‧‧‧Coil 22a‧‧ ‧Lead 22b‧‧‧Outer surface 24‧‧‧Ferrite core 24a‧‧‧Side surface 24b‧‧‧Outer surface 24c‧‧‧Inner surface 25‧‧‧Ferrite cage 26‧‧‧Base 27, 27A～27D‧‧‧Ferrite accommodating part 28‧‧‧Top end 29‧‧‧Side plate 29a‧‧‧Inner edge 29b‧‧‧Outer edge 30‧‧‧Outer connecting part (connecting part) 30a‧‧‧contact Pieces 30b‧‧‧contact pieces 30c‧‧‧protruding parts 31a, 31b‧‧‧inner connecting parts 32‧‧‧insertion openings 33a, 33b‧‧‧end plates 34a‧‧‧first elastic pieces 34b‧‧first Two elastic pieces 35a‧‧‧First restricting part 35b‧‧‧Second restricting part 36a, 36b‧‧‧Chamfered part 37‧‧‧Elastic piece 37a‧‧‧Sloping part 38‧‧‧Stopping piece 39‧‧ ‧Support plate 39a‧‧‧Outer peripheral part 39b‧‧‧Fixing protrusion 40‧‧‧First screw fixing part 41‧‧‧Second screw fixing part 42‧‧‧Third screw fixing part 43‧‧‧Arrangement part 43a ‧‧‧Side plate 43b‧‧‧End plate 43c‧‧‧Slot 43d‧‧‧Rib 43e‧‧‧Through hole 44‧‧‧Temperature fuse 45‧‧‧Reflector 46‧‧‧Bottom plate 46a‧‧‧Outer periphery Part 46b‧‧‧Fixing hole 47‧‧‧Side plate part 47a‧‧‧Outer peripheral part 47b‧‧‧Notch 48‧‧‧Step part 48a‧‧‧First part 48b‧‧‧Second part 49a～49d‧‧‧penetrating Hole 50‧‧‧Protruding piece 50a‧‧‧Threaded hole 50b‧‧‧Threaded hole 50c‧‧‧Locking piece 52‧‧‧Control board 54‧‧‧Blower fan 55‧‧‧Cover 56‧‧‧Cover body 57‧‧‧Cover body 58‧‧‧Inner cover 59‧‧‧Operation panel section 60‧‧‧Operation button 61‧‧‧Liquid crystal panel S1‧‧‧Gap S2‧‧‧limiting between elastic piece and contact piece Gap between part and coil T‧‧‧Thickness of ferrite core

Fig. 1 is a cross-sectional view of the rice cooker according to the embodiment of the present invention. Fig. 2 is a perspective view of the rice cooker with the lid open. Fig. 3 is an exploded perspective view of the lower part of the rice cooker. Fig. 4 is a bottom view of the rice cooker with the main body exterior, a part of the reflector, and a part of the ferrite holder removed. Fig. 5 is a cross-sectional view of the protective frame, the coil, the ferrite holder, and the reflector. Fig. 6 is an exploded perspective view of the protective frame, the coil, the ferrite holder and the reflector. Fig. 7 is an exploded perspective view of the ferrite holder and the reflector. FIG. 8 is an exploded perspective view of the ferrite holder and the reflector seen from a different angle from that of FIG. 7 . Fig. 9 is a cross-sectional view showing the relationship between the ferrite holder and the ferrite core. Fig. 10 is a perspective view showing a modification of the ferrite holder and the reflector.

20‧‧‧Protective frame

20b‧‧‧Bottom wall

20c‧‧‧Bent wall

20d‧‧‧Sidewall

20e‧‧‧stop

20f‧‧‧Support

20g‧‧‧Protrusion

20h‧‧‧Protrusion

20i‧‧‧Locating protrusion

22‧‧‧Coil

22b‧‧‧Outer surface

24‧‧‧Ferrite Core

24b‧‧‧Outer surface

24c‧‧‧Inner surface

25‧‧‧Ferrite cage

27, 27A, 27B‧‧‧Ferrite storage part

28‧‧‧Top

29a‧‧‧Inner edge

29b‧‧‧Outer edge

30‧‧‧Outer connecting part (connecting part)

30a‧‧‧Abutting piece

30c‧‧‧Projection

31a, 31b‧‧‧Inner connecting part

32‧‧‧Inlet

33a, 33b‧‧‧End Plate

34a‧‧‧First elastic sheet

34b‧‧‧Second elastic sheet

35a‧‧‧First Restriction Division

35b‧‧‧Second Restriction Section

36a, 36b‧‧‧Chamfer

37‧‧‧Elastic Sheet

38‧‧‧Stops

45‧‧‧Reflector

46‧‧‧Bottom plate

47‧‧‧Side panel

Claims (9)

A cooker, comprising: a bottomed cylindrical pot accommodating portion; and a ferrite holder disposed on the outside of the pot accommodating portion and maintaining an annular shape with the pot accommodating portion. a coil, and the ferrite holder has a ferrite accommodating portion for accommodating and holding a columnar ferrite core, and the ferrite accommodating portion includes an insertion opening for the ferrite core and an elastic piece, which is provided on the side of the pot accommodating portion and elastically applies force to the ferrite core, the elastic piece has a restricting portion, and the restricting portion passes through the pot accommodating portion or the pot accommodating portion or The elastic deformation of the elastic piece is restricted by the contact of the coil, the insertion port is provided at one end side in the longitudinal direction of the ferrite accommodating portion, and the elastic piece includes a first elastic piece formed from the one end side having the insertion opening extends toward the other end side opposite to the insertion opening; and a second elastic piece facing the other end side so as to be opposed to the first elastic piece The one end side extends, and the restricting portion is provided at an opposing portion where the first elastic piece and the second elastic piece face each other, and protrudes toward the coil. The cooker according to claim 1, wherein the restricting portion provided on the second elastic piece is inclined in a direction approaching the insertion port. The cooker according to claim 1 or 2, wherein a stopper for preventing the inserted ferrite core from coming out is provided in the insertion port. The cooker according to claim 1 or 2, wherein, The thickness from the outer surface to the inner surface of the ferrite core has a prescribed tolerance, and the ferrite core of the smallest size within the tolerance is inserted into the ferrite core from the insertion port In the accommodating portion, the gap between the outer surface of the pan accommodating portion or the coil and the restricting portion is zero when the elastic sheet is deformed to the maximum by the ferrite core. The cooker according to claim 3, wherein the thickness from the outer surface to the inner surface of the ferrite core has a prescribed tolerance, and the ferrite having the smallest size within the tolerance The magnetic core is inserted into the ferrite accommodating part from the insertion port, and the elastic piece is deformed to the maximum by the ferrite core, the outer surface of the pot accommodating part or the coil and the The gap between the restraints is zero. The cooker according to claim 1 or 2, wherein the cooker is provided with a reflector plate which is arranged on the outside of the ferrite holder and extends from the axis of the pot accommodating portion. A shape covering the coil when viewed from a direction, a plurality of the ferrite accommodating parts are provided so as to protrude radially with the center of the coil as the center, and a plurality of the adjacent ferrite accommodating parts are provided. At least one of the spaces between is provided with a support plate having an outline corresponding to the outer shape of the reflection plate. The cooker according to claim 3, wherein the cooker includes a reflector that is disposed outside the ferrite holder in a direction extending from the axis of the pot accommodating portion The shape covering the coil in observation, the plurality of ferrite accommodating portions are provided so as to protrude radially with the center of the coil as the center, A support plate having an outline corresponding to the outer shape of the reflector is provided in at least one space between the adjacent plurality of ferrite accommodating portions. The cooker according to claim 4, wherein the cooker includes a reflector that is disposed outside the ferrite holder in a direction extending from the axis of the pot accommodating portion A shape covering the coil when observed, a plurality of the ferrite accommodating parts are provided so as to protrude radially with the center of the coil as the center, and between the adjacent plurality of the ferrite accommodating parts. At least one space in the space is provided with a support plate having an outline corresponding to the outer shape of the reflector plate. The cooker according to claim 6, wherein the ferrite holder includes: a first screw fixing part fixed to the pot accommodating part; and a second screw fixing part together with the reflecting plate being fixed on the pot accommodating part; and a third screw fixing part, which fixes the reflecting plate.

Images