JP3938165B2 - Induction heating cooker - Google Patents

Description

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

  Conventionally, this type of linear light emitter has a columnar shape with a circular cross section (see, for example, Patent Document 1). FIG. 14 shows the linear light emitter described in Patent Document 1.

  In FIG. 14, the linear light emitter 1 is composed of a light source 2 and a columnar light guide 3 having a circular cross section that guides light from the light source 2. Then, at least one strip-shaped light reflecting layer 4 is provided on the side surface of the light guide 3 along the length direction by printing. With this configuration, the light incident on the light guide 3 from the light source 2 is partially 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. It is disclosed that linear light emission can be obtained by radiating light from the portion to the outside.

  The induction heating cooker also applies a high-frequency current to the heating coil, generates a high-frequency magnetic field, generates Joule heat due to eddy currents in the pan (load) magnetically coupled to the heating coil, and heats the pan itself for cooking. It is a cooker that performs. Therefore, there is a problem that the heating part cannot be visually grasped unlike a gas cooker in which a flame is visible and an electric heater in which the heating part is red hot.

  In order to solve this problem, a plurality of heating display light emitting diodes are provided on the outer periphery of the heating coil in an annular shape, and a fire power display light emitting diode is provided near the outside of the heating coil. The light emitting diode shines so that the heating state can be understood (for example, see Patent Document 2).

Further, as shown in FIG. 15, a fan-shaped light guide piece 5 and a light source 6 provided like a fan are provided as one block of a light emitter below the induction heating coil, 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, and light is emitted from the outer peripheral light emitting surface 7 of the annular light guide so that the heating state can be understood (for example, Patent Documents). 3).
JP 2000-222907 A Japanese Patent Laid-Open No. 7-312279 Japanese Patent Laid-Open No. 2001-160483

  However, in the configuration of the conventional linear light emitter, since the light reflection layer 4 is provided on the side surface of the cylindrical light guide 3, when the light reflected from the light reflection layer 4 radiates to the outside, the light guide 3 has a convex surface, and there is a problem that light is diffused and it is difficult to obtain a clear linear shape.

  In addition, since the conventional induction heating cooker has a shape in which, for example, a light bulb is arranged as a light emitting means around the induction heating coil, a plurality of light bulbs are required to display a heating unit 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 it is a dot display.

  Further, the light guide piece 5 and the power source 6 that are made into one block and combined in an annular shape have a problem that the configuration is complicated and the price is high.

  The present invention solves the above-mentioned conventional problems, and provides a linear light emitter that is highly reliable and easily obtains a clear linear shape, and is provided on the outer periphery of the induction heating coil. An object of the present invention is to provide an induction heating cooker that can clearly display the heating range of the heating unit.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a translucent top plate provided on an upper surface of a main body case and a heated cooking container provided on the top plate. A heating unit that heats by induction heating; an induction heating coil that is provided below the top plate corresponding to the heating unit; a ferrite that is provided radially below the induction heating coil; and an outer peripheral part of the induction heating coil. A linear light-emitting body that emits light in the direction of the top plate over the entire circumference of the provided induction heating coil, and the linear light-emitting body is a light guide that is formed in an annular shape with a cross-section that guides light. A light introduction part formed on a part of the light guide, and a light source. The light guide is incident on the light from the light source and forms one side of the quadrilateral in the cross section. and a light emitting surface for emitting the light to outside, a light reflecting layer on opposite sides before Symbol emitting surface Continuously provided, the light-emitting surface and the surface opposite the surface facing the light emission surface parallel Toshikatsu the light emitting surface with less light leaking out at irregular reflection by the mirror surface of the light guide The light emitting surface emits light farther from the light source, and the light source is provided between the extension lines on the outer periphery of the induction heating coil while avoiding the extension line in the outer peripheral direction of the ferrite. With this configuration , the light reflecting layer is continuously provided on the surface facing the light emitting surface, the light emitting surface is positioned in parallel to the traveling direction of the light propagating through the light guide, and the surface facing the light emitting surface is a mirror surface. By reducing the amount of light leaked to the outside due to irregular reflection, the loss of propagating light can be reduced and the light emitting surface of the light guide can be emitted farther. When the light reflected from the light reflecting layer radiates to the outside, the radiation surface of the light guide is flat, so that the reflected light 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. Thereby, since light is emitted over a part or the entire circumference of the induction heating coil with a simple configuration, the heating unit can be clearly displayed on the top plate. In addition, by arranging the ferrite in a radial shape below the induction heating coil, avoiding the extension line in the outer peripheral direction of the ferrite, and providing a light source between the extension wire lines at the outer periphery of the induction heating coil The light source can be made less susceptible to magnetism.

  As described above, according to the present invention, it is possible to obtain a linear light-emitting body with high reliability and easy to obtain a clear linear shape. Moreover, the heating range of a heating part can be clearly displayed on the top plate of an induction heating cooking appliance. In addition, the light source can be made less susceptible to magnetism.

The invention according to claim 1 is a translucent top plate provided on the upper surface of the main body case, a heating unit for placing the heated cooking container provided on the top plate and heating it by induction heating, Over the entire circumference of the induction heating coil provided on the outer periphery of the induction heating coil, the induction heating coil provided below the top plate corresponding to the heating unit, the ferrite provided radially below the induction heating coil, and the induction heating coil A linear light emitter that emits light in the top plate direction, and the linear light emitter is formed in a light guide having a quadrangular annular cross section for guiding light, and a part of the light guide A light-emitting surface that includes the formed light introducing portion and a light source, and the light guide body emits the light from the light source and emits the light to the outside as a surface that is one side of the quadrilateral in the cross section. and then, the pre-Symbol light reflecting layer on a surface facing the light emitting surface provided continuously, the light-emitting and the light emitting surface The opposing surfaces of the opposing surfaces parallel Toshikatsu the light emitting surface causes the light emitting surface of the light guide body by a little light leaks to the outside irregular reflection by a mirror surface to further from the light source The light source layer is continuously provided on the surface facing the light emitting surface by avoiding the outer peripheral extension line of the ferrite and providing the light source between the extension lines on the outer periphery of the induction heating coil. provided, since less light leaking out at irregular reflection by the surface of the light emitting surface is opposed to a position vital light emitting surface parallel to the traveling direction of light propagating in the light guide with mirror, propagation The loss of light is reduced, and the light emitting surface of the light guide can be emitted farther. Also, when the light reflected from the light reflecting layer radiates to the outside, the radiation surface of the light guide is flat, so that the reflected light from the light reflecting layer will radiate by going straight to the outside and diffuse. It becomes difficult. Therefore, clear linear light emission can be obtained. Therefore, since light is emitted over a part or the entire circumference of the induction heating coil with a simple configuration, the heating unit can be clearly displayed on the top plate. In addition, by arranging the ferrite in a radial shape below the induction heating coil, avoiding the extension line in the outer peripheral direction of the ferrite, and providing a light source between the extension line and the outer periphery of the induction heating coil. The light source can be made less susceptible to magnetism.

  The invention according to claim 2 is a surface facing the light emitting surface, in particular, in the linear light emitter according to claim 1, instead of a configuration in which a light reflecting layer is provided on a surface facing the light emitting surface of the light guide. With the configuration in which the reflective material that reflects light is superimposed, the light reflected by the reflective material can be irradiated to the outside from the light emitting surface. Further, by changing the color of the reflecting material, it is possible to select a color to be irradiated from the light emitting surface to the outside.

( Reference form 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 emitter 10 in Reference Embodiment 1 of the present invention.

  In FIG. 1, reference numeral 11 denotes a light source that uses a light bulb, an LED (light emitting diode), or the like. In particular, a light emitting diode is preferable because it has various emission colors and can be selected according to the purpose. A light guide 12 for guiding light incident from the light source 11 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 reflecting layer provided on one side of the light guide 12. This 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. Moreover, a light reflection layer can be obtained by providing an adhesive layer such as silicone rubber or an adhesive layer by attaching an adhesive tape. Further, it can be obtained by forming a film containing metal or metal oxide particles such as aluminum oxide, silicon oxide, and titanium oxide.

  About the linear light-emitting body 10 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

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

Hereinafter, the effect of the light reflection layer will be described with reference to the perspective view of the light guide in FIG. In FIG. 2, a polycarbonate having a rectangular cross section with a width of d3 mm and a height of h15 mm was used as the light guide, and silicone rubber (adhesive) was used as the light reflecting layer 13. The effect of the light reflecting layer was performed by measuring the illuminance at a point at a certain distance l100 mm from the light source. The illuminance when the light reflecting layer 13 was not provided was 0.7 lux, and the illuminance when the light reflecting 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 other than the light emitting surface 14 was 1.97 lux. This remarkable light emission increases can be seen that the by providing the light reflecting layer 13 on the surface against toward the emission surface 14 than. In addition, it can be seen that even if the light reflecting layer 13 is provided on a surface other than the surface facing the light emitting surface 14, the effect is not so much. In any case, clear linear light emission was obtained.

  Although the basic configuration has been described above, a more excellent linear light emitter can be obtained when the light guide is described below.

  That is, in order to allow light to reach a position far from the light source 11, if a layer having a refractive index smaller than that of the light guide is provided on a surface other than the light emitting surface 14, light transmission loss is reduced. To reach.

  Further, by making the reflectance of the light reflecting layer 13 different for each part, the radiation of light from the light emitting surface 14 is different, and a pattern of light intensity can be provided.

Further, when a mirror surface by mechanical or chemical means such as a surface to which the pair toward the light emitting surface 14, light is less likely to leak to the outside by irregular reflection, so that light can reach farther. This is also effective by performing either side.

  In addition, by making the light emitting surface 14 and the surface facing the light reflecting surface irregularly reflecting light by mechanical or chemical means, the light propagating in the light guide is diffusely reflected, and the light emitted from the light emitting surface 14 is reflected. The amount can be increased and clear linear light emission can be obtained.

  Further, the light emitting surface 14 is positioned in parallel to the traveling direction of the light propagating through the light guide 12. By adopting this configuration, the light-emitting surface 13 of the light guide 12 is caused to emit light farther without being influenced by the directivity of the light source 11 and without traveling straight light from the light source being lost during propagation. be able to.

  Also, as shown in FIG. 2, in the light guide 12 made of a quadrangle (rectangle) having a short side d and a long side h, if the short side d is the light emitting surface 14, the light from the light source 11 can reach farther. can do. Further, as the length of the long side h is made longer than that of the short side d, the light can reach farther. Experimental examples are shown in (Table 1).

  In Table 1, the power supply voltage of the LED was adjusted so that a point 50 mm from the light source was 0.7 lux, and the illuminance was measured at a distance of 100 mm and 150 mm from the light source. 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. Also, 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 long side h, the better the light propagates farther. This is presumably because more light is sent far away than the light lost from the light emitting surface 14.

  Further, as shown in FIG. 2, when the thickness h of the light guide 12 is made 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 from the light source is effectively used. Thus, the light emitting surface 14 can be illuminated far.

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

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

  FIG. 4 shows another example of replenishing light to an annular linear light emitter. FIG. 4 (a) is a plan view of the linear light emitter, and FIG. 4 (b) is another linear shape. It is a perspective view of a light-emitting body. As shown in the drawing, a light introducing portion 12 a made of the same material as that of the light guide 12 is provided in a part of the light guide 12. Thereby, a linear light emitter that replenishes light and emits light almost uniformly can be obtained.

  Further, as shown in Table 1, when an LED is used as a light source, the amount of light that reaches far varies depending on the viewing angle. Therefore, in order to make the light emission of the linear light emitter as uniform as possible, it is practical to set the viewing angle of the LED within 30 to 60 degrees.

  The uniform light emission in the present invention is not optically uniform but means that the appearance or actual feeling is almost 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, even if the light guide and the light reflecting layer are separately provided and used in an integrated manner, they are almost the same. An effect is obtained. Further, the light guide 12 is inserted into a U-shaped case as shown in FIG. 4C, or the mating surface of the light guide 12 with the light reflecting layer is circular as shown in FIG. 4D. The light reflecting layer 13 may be inserted into the light reflecting layer 13 to provide a light reflecting material on at least the surface of the case corresponding to the light emitting surface. Even in these cases, it is a matter of course that substantially the same effect as described above can be obtained even if various processes as described above are performed on the light guide.

(Embodiment 1 )
Embodiment 1 of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same component as the reference form 1, and the description is abbreviate | omitted.

  The outer periphery 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 surface, and does not specify the positional relationship in the height direction. However, in this embodiment, the light guide is described as being on the outer periphery 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 unit 17 that heats the pan by induction heating and cooks the food to be cooked, and a radial heater 18 that cooks using a pan that cannot be used for induction heating. A roaster 19 and an operation unit 20 are provided on the front side surface of the main body case 15.

  FIG. 6 is a cross-sectional view of an essential part showing one cross section of the heating unit 17 of FIG. In the figure, a cooking pot 21 is placed on the heating section 17 of the 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 unit 17 below the top plate 16, that is, the cooking pot. Further, a light guide 12 is provided below the top plate 16. Then, by making the size of the light guide 12 so as to surround the outer periphery of the induction heating coil 22, light emission from the light guide 12 reaches the top plate 16 without being disturbed 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 and blinking of the light source 11 during cooking.

Figure 7 is a plan view of a linear light-emitting body described in Reference Embodiment 1 FIG. In the present embodiment, the light guide 12 having a rectangular cross section is formed into an annular shape, and two light sources 11 are arranged at both ends thereof, for a total of two. The annular inner diameter is slightly larger than the outer shape of the induction heating coil 22. In addition, generally the light guide of such a shape is easily obtained by resin molding.

  The light emitted from the light source 11 propagates straight through the light guide 12 or repeatedly reflecting. In the process of propagating, light is emitted in the direction of the top plate 16, and the intensity is attenuated. In this way, the light radiates in the direction of the top plate 16 while propagating through the light guide 12, so that a figure having the same shape as the top shape of the light guide 12 is displayed on the top plate 16. When a linear light emitter having the shape shown in FIG. 7 is used, a ring is displayed. In particular, in the present embodiment, since a light guide having a square cross section is used, it is possible to suppress the diffusion of light and display a clear figure.

  FIG. 8 is a schematic diagram for explaining the relationship between the cooling air and the linear light emitter. In the figure, it is efficient to introduce the cooling air A for cooling the induction heating coil 22 from the lower part of the induction heating coil 22. When there is one blower fan 24 that generates cooling air and two induction heating coils 22, the cooling air A enters from the lower part of the first induction heating coil 22a and cools the first induction heating coil 22a. Thereafter, an air passage is provided for cooling the adjacent second induction heating coil 22b and then discharging it to the outside. At this time, the light source 11 of the second induction heating coil 22b to be cooled later may be exposed to the cooling air A having a high temperature. In particular, when a semiconductor light emitting element such as an LED is used as the light source 11, not only its lifetime but also its light emission characteristics are affected by the ambient temperature. In such a case, as shown in FIG. 9, the light source 11 of the linear light emitter 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 the positional relationship between the ferrite 25 provided radially on the bottom surface of the induction heating coil and the linear light emitter 10. Ferrite is used to reduce magnetic flux leakage. As shown in the figure, the light source 11 is provided on the extension line while avoiding the extension line of the ferrite provided radially. This is because the magnetic flux is not reduced so much on the radial extension line, and the light source 11 is easily affected by the magnetic flux.

  For the top plate 16, crystallized glass or the like is used. Usually, the top plate 16 is colored so that the inside cannot be seen. 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 emitter according to the present embodiment, a figure obtained by applying a heat-resistant translucent paint is brighter than coloring the crystallized glass itself. Obtained. Further, the heat-resistant and translucent paint can be selected in accordance with the wavelength of light, and different colors can be transmitted in a top plate shape.

(Reference form 2 )
Hereinafter, Reference Embodiment 1 of the present invention will be described. Note that the reference for Embodiment 1 and Embodiment 1 and the same components will be assigned the same reference numerals, and a description thereof will be omitted.

FIG. 11 shows a light emitter 26 used in this embodiment. The light-emitting body 26 is formed by concentrically annularly integrating three light guide bodies 12 of Reference Embodiment 1, and at least one light source (not shown) is disposed on each light guide body 12 to form an induction heating coil. It is arranged on the outer periphery. This changes the type, color, size, or brightness of the light source for each light guide, and turns it on, flashes, or turns off, depending on the function of the device, the state of use, the size of the thermal power, or the time of use. As a result, it is possible to increase the number of display patterns and visually grasp the heating unit more easily.

(Reference form 3 )
Hereinafter, Reference Embodiment 3 of the present invention will be described. Note that the reference for Embodiment 1 and Embodiment 1 and the same components will be assigned the same reference numerals, and a description thereof will be omitted.

FIG. 12 shows a light emitter 27 used in this embodiment. The light emitter 27 is composed of four linear light emitters 10 of Reference Embodiment 1, which are integrated into an annular shape and arranged on the outer periphery of the induction heating coil. This changes the type, color, size, or brightness of the light source for each light guide, and turns it on, flashes, or turns off, depending on the function of the device, the state of use, the size of the thermal power, or the time of use. As a result, it is possible to increase the number of display patterns and visually grasp the heating unit more easily.

(Reference form 4 )
Hereinafter, Reference Embodiment 4 of the present invention will be described. Note that the reference for Embodiment 1 and Embodiment 1 and the same components will be assigned the same reference numerals, and a description thereof will be omitted.

FIG. 13 shows a light emitter 28 used in this embodiment. The light-emitting body 28 uses three light guide bodies 12 of Reference Embodiment 1 and is provided with a light isolation layer 29 along the length direction between the light guide bodies. A light source (not shown) is arranged and arranged on the outer periphery of the induction heating coil. This simplifies the configuration, and the type, color, size, or brightness of the light source can be changed for each light guide, and can be turned on, blinked, or turned off depending on the function, usage state, or usage time of the device. Since it can do, a display pattern can be increased and a heating part can be caught visually.

In the first embodiment and the second to fourth reference embodiments, the case where light is emitted over the entire circumference of the induction heating coil has been described. However, it may be a part of the heating coil such as a half circumference or an annular shape as necessary. Instead, other figures such as a rectangle may be displayed. Further, it may be a place other than the heating coil where it is desired to be visually distinguished from other places.

  As described above, according to the present embodiment, since a light guide having a rectangular cross section is used, a clear figure continuous over the whole can be drawn on the top plate instead of dots and lines. 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 is highly reliable and can produce clear linear light emission, so that the heating range of the heating unit is displayed on the top plate of the induction heating cooker, etc. It can be applied to other uses.

The perspective view of the linear light-emitting body in the reference form 1 of this 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 annular linear light emitter (A) Another overall plan view of the collinear light emitter (b) Other overall perspective view of the collinear light emitter (c) Other partial perspective view of the collinear light emitter (d) Concentric light emitter Other partial perspective view External appearance perspective view of the induction heating cooking appliance in Embodiment 1 of this invention Cross section of the main part of the induction heating cooker Top view of a linear light emitter used in the induction heating cooker Schematic diagram of the main parts of the induction heating cooker Schematic diagram for explaining the position of the light source of the induction heating cooker Schematic showing the positional relationship between the ferrite and the linear light emitter of the induction heating cooker The top view of the light-emitting body of the induction heating cooking appliance in the reference form 2 of this invention The top view of the light-emitting body of the induction heating cooking appliance in the reference form 3 of this invention The perspective view of the light-emitting body of the induction heating cooking appliance in the reference form 4 of this invention Perspective view of a conventional linear light emitter A perspective view of a conventional light emitter

Explanation of symbols

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

Claims (2)

A translucent top plate provided on the upper surface of the main body case, a heating unit for placing a heated cooking container provided on the top plate and heating it by induction heating, and the heating unit below the top plate Corresponding induction heating coils, ferrite provided radially below the induction heating coils, and linear light emitting in the direction of the top plate over the entire circumference of the induction heating coils provided on the outer periphery of the induction heating coil A light-emitting body, and the linear light-emitting body includes a light guide formed in an annular shape having a quadrangular cross section for guiding light, and a light introduction portion formed in a part of the light guide; and a light source, the light guide is incident to the light from the light source, the surface to be the side of the quadrilateral with the cross-section, and a light emitting surface that emits the light to the outside, facing the front Symbol emitting surface It provided a light reflecting layer successively on a surface, parallel to the surface facing to the light emitting surface and the light emitting surface The surface facing the life-and-death said light emitting surface causes the light emitting surface of the light guide body by a little light leaks to the outside irregular reflection by a mirror surface to further from the light source, the outer circumferential direction of the ferrite An induction heating cooker configured to avoid the extension line and to provide the light source between the extension lines on the outer periphery of the induction heating coil . The linear light-emitting body according to claim 1, wherein instead of a configuration in which a light reflecting layer is provided on a surface facing the light emitting surface of the light guide, a reflective material that reflects light is superimposed on a surface facing the light emitting surface. Induction heating cooker.

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