JP2004335481A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker which is provided with a linear light emitting body reliable and easy to provide a clear linear light at the outer peripheral part of an induction heating coil, and can display clearly the corresponding heating range of the heating part. <P>SOLUTION: The induction heating cooker is provided with a lightguide body 12 of which a cross section which guides light is rectangular and a light source 11 provided in the length direction of the light guide body 12. It also has a linear light emitting body 10 of which one side of a rectangle is a light emitting surface 14 which emits light outside and the side facing the light emitting surface 14 provided with a light reflecting layer 13 made from silicon rubber (bond) or an adhesive. With no light emission from the light emitting surface 14 being diffused, a clear graphics can be drawn corresponding to the induction heating coil on a top plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an induction heating cooker using a linear light emitter.

  Conventionally, as this type of linear luminous body, there has been a columnar luminous body having a circular cross section (for example, see Patent Document 1). FIG. 14 shows a linear light-emitting body described in Patent Document 1.

  In FIG. 14, a linear light-emitting body 1 includes a light source 2 and a column-shaped light guide 3 having a circular cross section for guiding light from the light source 2. At least one strip-shaped light reflection layer 4 is provided on the side surface of the light guide 3 along its length direction by printing. With this configuration, a part of the light incident on the light guide 3 from the light source 2 is reflected by the light reflection layer 4 while traveling through the light guide 3, and the light guide 3 facing the light reflection layer 4 is formed. It is disclosed that linear light emission can be obtained by radiating light from the portion to the outside.

  In addition, induction heating cookers apply high-frequency current to the heating coil to generate a high-frequency magnetic field, generate Joule heat due to eddy currents in the pot (load) magnetically coupled to the heating coil, and heat the pot itself to cook. Is a cooker that does. Therefore, there is a problem that the heating unit cannot be visually grasped unlike a gas cooker in which a flame is visible or an electric heater in which the heating unit is red-hot.

  In order to solve this problem, a plurality of heating display light emitting diodes are provided annularly on the outer periphery of the heating coil, and a heating power display light emitting diode is provided near the outside of the heating coil. The light emitting diode is made to be able to recognize the heating state (for example, see Patent Document 2).

Further, as shown in FIG. 15, below the induction heating coil, a fan-shaped light guide piece 5 and a light source 6 provided in a fan shape form one block of a light-emitting body, and these blocks are combined to form an annular shape. The light source 6 is turned on when the induction heating coil is energized and heated to emit light on the outer peripheral light emitting surface 7 of the annular light guide so that the heating state can be recognized (for example, see Patent Document 1). 3).
JP-A-2000-222907 JP-A-7-310279 JP 2001-160483 A

  However, in the configuration of the conventional linear light-emitting body, since the light reflecting layer 4 is provided on the side surface of the cylindrical light guide 3, when the light reflected from the light reflecting layer 4 is radiated to the outside, the light guide is used. 3 has a problem that the emission surface is convex, and light is diffused to make it difficult to obtain a clear linear shape.

  Further, the conventional induction heating cooker has a form in which, for example, a light bulb is disposed as a light emitting means around the induction heating coil, so that a plurality of light bulbs are required to display a heating section corresponding to the induction heating coil. In addition, if the number of light bulbs is limited, there is a problem that the whole is difficult to understand because of the point display.

  Furthermore, the light guide piece 5 and the power supply 6 are made into one block, and the combination thereof in an annular shape has a problem that the configuration becomes complicated and the price increases.

  The present invention solves the above-mentioned conventional problems, and provides a linear luminous body having high reliability and easy to obtain a clear linear shape, and providing the linear luminous body on an outer peripheral portion of an induction heating coil. It is an object of the present invention to provide an induction heating cooker capable of clearly displaying a heating range of a heating unit to be heated.

  In order to solve the above-mentioned conventional problems, an induction heating cooker of the present invention includes a translucent top plate provided on an upper surface of a main body case and a cooking container provided on the top plate. A heating unit for heating by induction heating, an induction heating coil provided below the top plate corresponding to the heating unit, and a part or the entire circumference of the induction heating coil provided on an outer peripheral portion of the induction heating coil. A linear light-emitting body that emits light in the direction of the top plate is provided, and the linear light-emitting body is provided at least at one end in a length direction of the light guide, the light guide having a quadrangular cross section for guiding light. A light source, and the light guide receives the light from the light source, and sets a surface that forms one side of the quadrilateral in the cross section as a light emitting surface that emits the light to the outside, and faces the light emitting surface. A light reflecting layer made of an adhesive or a pressure-sensitive adhesive was provided on the surface to be formed. When the light reflected from the light reflecting layer radiates to the outside, the light emitting surface of the light guide is flat, so the light reflected from the light reflecting layer goes straight to the outside and radiates, and diffuses. It becomes difficult. Therefore, clear linear light emission can be obtained. Further, with a simple configuration, light is emitted over a part or the entire circumference of the induction heating coil, so that the heating section can be clearly displayed on the top plate. Further, by providing the light reflecting layer with an adhesive or a pressure-sensitive adhesive, the light reflecting layer can be easily and reliably provided.

  As described above, according to the present invention, with a simple configuration, a highly reliable linear luminous body that can easily obtain a clear linear shape allows the heating range of the heating unit to be set on the top plate of the induction heating cooker. It can be clearly displayed.

  The invention according to claim 1, wherein a translucent top plate provided on the upper surface of the main body case, a heating unit that places a heated cooking container provided on the top plate and heats the container by induction heating, An induction heating coil provided below the top plate corresponding to the heating section, and linear light emission provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil. A light guide that guides light and has a quadrangular cross section for guiding light, and a light source provided at at least one end in a length direction of the light guide. The light is incident from the light source, a surface that becomes one side of the quadrilateral in the cross section is a light emitting surface that radiates the light to the outside, and an adhesive or an adhesive is formed on a surface facing the light emitting surface. By adopting a configuration in which a light reflection layer is provided, a part of the induction heating coil can be formed with a simple configuration. The other emits light over the whole circumference can be clearly displayed heating unit on the top plate.

  Also, when the light reflected from the light reflecting layer radiates to the outside, the light emitting surface of the light guide is flat, so the light reflected from the light reflecting layer goes straight to the outside and radiates, and diffuses. It becomes difficult. Therefore, clear linear light emission can be obtained. Further, by providing the light reflecting layer with an adhesive or a pressure-sensitive adhesive, the light reflecting layer can be easily and reliably provided.

  According to a second aspect of the present invention, there is provided a light guide formed at a part of the light guide instead of the light source according to the first aspect, which is provided at least at one end in the length direction of the light guide. By having a configuration in which the light guide is formed in a ring shape, for example, the outer peripheral portion of the induction heating coil can be specified.

  According to the third aspect of the present invention, in particular, the radiation of light is remarkably increased by using the silicone rubber as the adhesive.

  According to the invention described in claim 4, the light reflecting layer can be easily and reliably provided by using an adhesive tape as the adhesive.

  The invention according to claim 5 can reduce leakage of light due to irregular reflection, in particular, by a configuration in which the linear illuminant has at least one of a light emitting surface and a surface facing the light emitting surface as a mirror surface. Light can propagate far.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a linear light-emitting body 10 according to Embodiment 1 of the present invention.

  In FIG. 1, reference numeral 11 denotes a light source, such as a light bulb or an LED (light emitting diode). In particular, light emitting diodes are preferable because they have various emission colors and can be selected according to the purpose. Reference numeral 12 denotes a light guide for guiding light incident from the light source 11, and is made of a synthetic resin such as acrylic resin, polycarbonate, polyamide, or polyimide, or a transparent material such as glass. FIG. 1 shows an example in which a quadrilateral having a rectangular cross section is used. Reference numeral 13 denotes a light reflection layer provided on one side of the light guide 12. The light reflecting layer is formed by providing irregularities on the surface by mechanical means such as polishing the surface or chemical means such as etching the surface. The light reflecting layer can be obtained by providing an adhesive layer such as silicone rubber or an adhesive layer such as by sticking an adhesive tape. Further, it can be obtained by forming a film containing particles of a metal or a metal oxide such as aluminum oxide, silicon oxide, and titanium oxide.

  The operation and operation of the linear light-emitting body 10 configured as described above will be described below.

  Light incident from the light source 11 is guided through the light guide 12. Then, part of the light is reflected by the light reflecting layer 13 and radiated from the light emitting surface 14 to the outside. At this time, the light guide 12 is formed in a quadrangular shape, and the light reflecting layer 13 is provided on one side thereof, so that the light reflected here emits outside from the light emitting surface 14 which is the side corresponding to the light reflecting layer 13. I do. Since the light emitting surface 14 is a flat surface, light emission from the light emitting surface is parallel and hardly diffuses. Therefore, clear linear light emission can be obtained along the traveling direction of light of the light guide.

  Hereinafter, the effect of the light reflecting layer will be described with reference to the perspective view of the light guide of FIG. In FIG. 2, a light guide is made of polycarbonate having a rectangular cross section of width d3 mm and height h15 mm, and silicone rubber (adhesive) is used as the light reflection layer 13. The effect of the light reflecting layer was obtained by measuring the illuminance at a point at a fixed distance of l100 mm from the light source. The illuminance when the light reflection layer 13 was not provided was 0.7 lux, and the illuminance when the light reflection layer 13 was provided only on the surface facing the light emitting surface 14 was 1.79 lux. The illuminance when the light reflecting layer 13 was provided on all surfaces except the light emitting surface 14 was 1.97 lux. From this, it can be seen that providing the light reflecting layer 13 on the surface opposing the light emitting surface 14 significantly increases light emission. It can also be seen that providing the light reflecting layer 13 on a surface other than the surface facing the light emitting surface 14 is not so effective. In each case, clear linear light emission was obtained.

  The basic structure has been described above, but if the light guide is described below, a more excellent linear light-emitting body can be obtained.

  That is, if a layer having a smaller refractive index than the light guide is provided on a surface other than the light emitting surface 14 so that light can reach a position far from the light source 11, light transmission loss is reduced. Will arrive.

  In addition, by making the reflectance of the light reflecting layer 13 different for each portion, light emission from the light emitting surface 14 is different, and a pattern of light intensity can be provided.

  Further, if the light emitting surface 14 and the surface facing the light emitting surface 14 are mirror surfaces by mechanical or chemical means or the like, light is less likely to leak to the outside due to irregular reflection, and light can reach far. This is also effective if one of the surfaces is performed.

  Further, the light-emitting surface 14 and the surface facing the light-emitting surface 14 are irregularly-reflected surfaces that randomly reflect light by mechanical or chemical means or the like. The amount can be increased, and clear linear light emission can be obtained.

  Further, the light emitting surface 14 is configured to be positioned parallel to the traveling direction of light propagating in the light guide 12. With this configuration, the light emitting surface 13 of the light guide 12 is made to emit farther without being affected by the directivity of the light source 11 and since the straight light from the light source arrives without being lost during propagation. be able to.

  Further, as shown in FIG. 2, in the light guide 12 formed of a square (rectangle) having a short side d and a long side h, when the short side d is the light emitting surface 14, the light from the light source 11 can reach farther. can do. In addition, light can reach farther as the length of the longer side h is longer than the shorter side d. Experimental examples are shown in (Table 1).

（表１）は光源から５０ｍｍの地点が０．７ルックスになるようにＬＥＤの電源電圧を調整し、光源からの距離が１００ｍｍおよび１５０ｍｍ地点の照度を測定した。このとき、導光体１２の発光面１４である短辺ｄを３ｍｍとし、長辺ｈを５、１０、１５ｍｍに変えておこなった。また、ＬＥＤの視野角も変えて行った。表に見られるようにＬＥＤの視野角に関係なく、長辺ｈが大きいほど光が遠くにまで良く伝播するのが分かる。これは、発光面１４から放射して失われる光よりもより多くの光が遠方に送られるためと考えられる。

In Table 1, the power supply voltage of the LED was adjusted so that the point 50 mm from the light source became 0.7 lux, and the illuminance at the points 100 mm and 150 mm from the light source was measured. At this time, the short side d which is the light emitting surface 14 of the light guide 12 was set to 3 mm, and the long side h was changed to 5, 10 and 15 mm. In addition, the viewing angle of the LED was changed. As can be seen from the table, regardless of the viewing angle of the LED, the longer the h is, the better the light propagates farther. It is considered that this is because more light is transmitted far away than light emitted and lost from the light emitting surface 14.

  Further, as shown in FIG. 2, when the thickness h of the light guide 12 is larger than the thickness t of the light reflection layer 14, the loss of light propagating in the light guide 12 is reduced, and the light of the light source is effectively used. Thus, the light emitting surface 14 can be illuminated far away.

  In addition, the linear illuminant emits light linearly. Therefore, the shape is not limited to the rod shape, and the shape can be an annular shape, or a triangular or polygonal shape by combining rod-shaped linear light-emitting bodies. In addition, a linear light-emitting body processed into an arbitrary shape can be obtained. In particular, when an annular linear illuminant is used for the induction heating cooker, the outer peripheral portion of the induction heating coil can be clearly shown, and the handling becomes easy.

  Next, the light source will be described. The radiation intensity of the light from the light guide 12, that is, the luminance, decreases as the distance from the light source 11 increases. Therefore, it is necessary to supplement light in the middle of the light guide 12 to make the irradiation intensity of the light guide 12 almost uniform. In general, a linear luminous body having a total length of about 50 to 70 cm can be obtained by providing light sources 11 on both sides of the linear luminous body as shown in FIG. FIG. 3A shows the case of a rod-shaped linear light emitter, and FIG. 3B shows the case of an annular linear light emitter.

  FIG. 4 shows another example of supplementing light to an annular linear luminous body. FIG. 4 (a) is a plan view of the linear luminous body, and FIG. 4 (b) is another linear luminous body. It is a perspective view of a light-emitting body. As shown in the figure, a light introducing portion 12a made of the same material as the light guide 12 is provided in a part of the light guide 12. This makes it possible to obtain a linear illuminant that replenishes light and emits light almost uniformly.

  When an LED is used as a light source as shown in Table 1, the amount of light reaching far differs depending on the viewing angle. Therefore, in order to make the emission of the linear illuminant as uniform as possible, it is practical to set the viewing angle of the LED within 30 to 60 degrees.

  Note that the uniform light emission in the present invention does not mean optically uniform but means that the appearance or actual feeling is substantially uniform.

  In the above description, the case where the light reflecting layer 13 is provided integrally with the light guide 12 has been described. However, substantially the same applies even when the light guide and the light reflecting layer are separately provided and these are overlaid and used as one. The effect is obtained. Further, the light guide 12 is inserted into a case having a U-shaped cross section as shown in FIG. 4 (c), or the mating surface of the light guide 12 with the light reflection layer is formed as an arc as shown in FIG. 4 (d). , And the light reflection layer 13 may be inserted in the light reflection layer 13 to provide a light reflection material on at least the surface of the case corresponding to the light emitting surface. Also in these cases, it is a matter of course that substantially the same effects as described above can be obtained even if various processes as described above are performed on the light guide.

(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  Note that the outer peripheral portion of the induction heating coil in the present embodiment means that the light guide is on the outer periphery of the induction heating coil on the projection plane, and does not specify the positional relationship in the height direction. However, in the present embodiment, the light guide is described as being on the outer peripheral portion of the induction heating coil.

  FIG. 5 is an external perspective view of the induction heating cooker used in the present embodiment. As shown in FIG. 5, a translucent top plate 16 is provided on the upper surface of the main body case 15. The top plate 16 is provided with a heating section 17 for heating the pot by induction heating to cook the object to be cooked, and a radiant heater 18 for cooking using a pot that cannot be used for induction heating. A roaster 19 and an operation unit 20 are provided on a front side surface of the main body case 15.

  FIG. 6 is a cross-sectional view of a main part showing one cross section of the heating unit 17 of FIG. In the figure, a cooking pot 21 is placed on a heating section 17 of a top plate 16. In order to heat the cooking pot 21, an induction heating coil 22 is provided at a position corresponding to the heating section 17 below the top plate 16, that is, the cooking pot. Further, the light guide 12 is provided below the top plate 16. By making the size of the light guide 12 large enough to surround the outer peripheral portion of the induction heating coil 22, light emission from the light guide 12 reaches the top plate 16 without being obstructed by the heating coil. The range of the heating unit 17 can be clearly displayed on the plate 16. Light emitted from the light source propagates through the light guide 12. Reference numeral 23 denotes a control unit that performs control such as adjustment of heating power during cooking and blinking of the light source 11.

  FIG. 7 is a plan view of the linear illuminator described in the first embodiment. In the present embodiment, the light guide 12 having a rectangular cross section is formed in an annular shape, and two light sources 11 are arranged at both ends thereof, two in total. The inner diameter of the ring is slightly larger than the outer shape of the induction heating coil 22. The light guide having such a shape is generally easily obtained by resin molding.

  The light emitted from the light source 11 propagates through the light guide 12 while repeating the straight or reflection. In the course of this propagation, light is emitted in the direction of the top 16 and its intensity is attenuated. Since the light radiates in the direction of the top plate 16 while propagating through the light guide 12 in this manner, a figure having the same shape as the upper surface shape of the light guide 12 is displayed on the top plate 16. When a linear luminous body having the shape shown in FIG. 7 is used, a ring is displayed. In particular, in the present embodiment, since the light guide having a rectangular cross section is used, diffusion of light can be suppressed, and a clear figure can be displayed.

  FIG. 8 is a schematic diagram for explaining the relationship between the cooling air and the linear illuminant. In the figure, it is efficient to take in cooling air A for cooling the induction heating coil 22 from below the induction heating coil 22. When one blower fan 24 for generating cooling air is provided and two induction heating coils 22 are provided, the cooling air A enters from a lower part of the first induction heating coil 22a and cools the first induction heating coil 22a. Thereafter, an air passage for cooling the adjacent second induction heating coil 22b and discharging the cooled outside to the outside is provided. At this time, the light source 11 of the second induction heating coil 22b which is cooled later may be exposed to the cooling air A having a high temperature. In particular, when a semiconductor light emitting device such as an LED is used as the light source 11, not only its life but also its light emitting characteristics are affected by the ambient temperature. Therefore, in such a case, as shown in FIG. 9, the light source 11 of the linear illuminant 10 provided corresponding to the second induction heating coil 22b to be cooled later is provided on the windward side. Thereby, the influence of the temperature of the cooling air A can be reduced.

  FIG. 10 is a schematic diagram showing a positional relationship between the ferrite 25 radially provided on the bottom surface of the induction heating coil and the linear light-emitting body 10. Ferrite is used to reduce the leakage of magnetic flux. As shown in the drawing, the light source 11 is provided between the extension lines of the ferrite provided in a radial shape, avoiding the extension lines. This is because the magnetic flux is not much reduced on the radial extension, and the light source 11 is easily affected by the magnetic flux.

  Note that crystallized glass or the like is used for the top plate 16. Usually, the top plate 16 is colored to make the inside invisible. As a coloring method, there are a case where the crystallized glass itself is colored and a case where the crystallized glass is coated and colored. When a figure is displayed on the top plate 16 using the linear light-emitting body according to the present embodiment, a brighter figure is obtained by applying a heat-resistant translucent paint than by coloring the crystallized glass itself. Obtained. The heat-resistant translucent paint can be selected according to the wavelength of light, and different colors can be transmitted through the top plate.

(Embodiment 3)
Hereinafter, Embodiment 3 of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

  FIG. 11 shows a light emitting body 26 used in the present embodiment. This light emitter 26 is concentrically annularly integrated with the three light guides 12 of the first embodiment, and at least one light source (not shown) is provided for each light guide 12, and an induction heating coil is provided. It is arranged on the outer periphery. With this, the type, color, size, or brightness of the light source is changed for each light guide, or the light is turned on, blinked, or turned off, depending on the function of the device, the state of use, the magnitude of the heat, or the use time. Therefore, the number of display patterns can be increased, and the heating section can be grasped visually more easily.

(Embodiment 4)
Hereinafter, Embodiment 4 of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

  FIG. 12 shows a light emitting body 27 used in the present embodiment. The luminous body 27 uses four linear luminous bodies 10 of the first embodiment, is integrated in an annular shape, and is arranged on the outer peripheral portion of the induction heating coil. With this, the type, color, size, or brightness of the light source is changed for each light guide, or the light is turned on, blinked, or turned off, depending on the function of the device, the state of use, the magnitude of the heat, or the use time. Therefore, the number of display patterns can be increased, and the heating section can be grasped visually more easily.

(Embodiment 5)
Hereinafter, a fifth embodiment of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

  FIG. 13 shows a light emitting body 28 used in the present embodiment. The light-emitting body 28 uses three light guides 12 of the first embodiment, provides a light isolation layer 29 between the light guides along the length direction, and forms an annular shape. A light source (not shown) is arranged and arranged on the outer periphery of the induction heating coil. This simplifies the configuration, and allows you to change the type, color, size, or brightness of the light source for each light guide, or turn it on, blink, or turn off, depending on the function, use state, or use time of the device. Since the number of display patterns can be increased, the heating section can be visually grasped.

  In the second to fifth embodiments, the case where light is emitted over the entire circumference of the induction heating coil has been described. However, if necessary, a part of the heating coil such as a half circumference may be used. May be displayed. Further, a portion other than the heating coil may be a portion that is visually distinguished from other portions.

  As described above, according to the present embodiment, since a light guide having a rectangular cross section is used, a continuous, clear figure can be drawn on the top plate, not a point or a line. In addition, the number of light sources used can be minimized, and the cost can be reduced.

  As described above, the induction heating cooker according to the present invention has high reliability and can obtain a clear linear light emission. Therefore, the heating range of the heating unit is displayed on the top plate of the induction heating cooker. It can also be applied to applications.

1 is a perspective view of a linear light-emitting body according to a first embodiment of the present invention. Perspective view of the light guide of the linear light emitter (A) Plan view of the rod-shaped linear light emitter (b) Plan view of the same annular linear light emitter (A) Another overall plan view of the same linear light emitter (b) Another overall perspective view of the same linear light emitter (c) Another partial perspective view of the same linear light emitter (d) The same linear light emitter Other partial perspective view of External perspective view of an induction heating cooker according to Embodiment 2 of the present invention. Sectional view of the main part of the induction heating cooker Plan view of a linear illuminant used in the induction heating cooker Schematic diagram of the main part of the induction heating cooker Schematic diagram for explaining the position of the light source of the induction heating cooker Schematic diagram showing the positional relationship between the ferrite and the linear illuminant of the induction heating cooker Plan view of luminous body of induction heating cooker according to Embodiment 3 of the present invention Plan view of luminous body of induction heating cooker according to Embodiment 4 of the present invention Embodiment 5 A perspective view of a light emitter of an induction heating cooker according to Embodiment 5 of the present invention. Perspective view of a conventional linear light-emitting body Perspective view of a conventional luminous body

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Linear light-emitting body 11 Light source 12 Light guide 13 Light reflection layer 14 Light-emitting surface 15 Main body case 16 Top plate 17 Heating part 21 Cooking pot (cooking container to be heated)
22 Induction heating coil 24 Ventilation fan 25 Ferrite 29 Optical isolation layer

Claims (5)

A light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, Has a light guide having a quadrangular cross section for guiding light, and a light source provided at at least one end in the length direction of the light guide, and the light guide receives the light from the light source. Then, a surface that forms one side of the quadrilateral in the cross section is a light emitting surface that radiates the light to the outside, and induction heating cooking is provided in which a light reflecting layer made of an adhesive or an adhesive is provided on a surface facing the light emitting surface. vessel. The linear light-emitting body has a light introduction part formed in a part of the light guide, and a light source, instead of the light source according to claim 1 provided at at least one end in the length direction of the light guide, The induction heating cooker according to claim 1, wherein the light guide is formed in an annular shape. 3. The induction heating cooker according to claim 1, wherein the adhesive is silicone rubber. The induction heating cooker according to any one of claims 1 to 3, wherein the adhesive is an adhesive tape. The induction heating cooker according to claim 1, wherein the linear illuminant has a configuration in which at least one of a light emitting surface and a surface facing the light emitting surface is a mirror surface.

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