JP3941812B2 - Induction heating cooker - Google Patents

Description

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

  Conventionally, as this type of linear light emitter, there is one in which a strip-shaped light reflecting layer is provided by printing on the side surface of a columnar light guide having a circular cross section along its length direction (for example, Patent Document 1). FIG. 15 shows a linear light emitter described in Patent Document 1.

  In FIG. 15, 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. For this reason, there is a problem that the heating part cannot be visually grasped unlike a gas cooker in which a flame is visible or an electric heater in which the heating part is red hot.

  In order to solve this problem, conventionally, a fan-shaped light guide piece and a light source provided like a fan are provided below the induction heating coil as one block of a light emitter, and these blocks are combined to form an annular shape. There exists what comprised the light guide (for example, refer patent document 2). FIG. 16 shows a linear light emitter described in Patent Document 1. As shown in FIG. 16, a fan-shaped light guide piece 5 and a light source 6 provided like a fan are provided below the induction heating coil to form one block of a light emitter, and these blocks are combined to form an annular guide. The light source 6 is turned on when the induction body is heated by energizing the induction heating coil, and the outer periphery of the annular light guide emits light on the light emitting surface 7 on the top surface of the top plate provided on the induction heating cooker. It is described that an annular pattern is drawn.

Prior to the present invention, as shown in FIG. 17, a linear light-emitting body in which a part of an annular light guide 8 is cut out and a light source 9 is in contact with the cut-out portion is used in an induction heating cooker. Proposed that.
JP 2000-222907 A JP 2001-160483 A

  However, in the configuration of the conventional linear light emitter, the luminance of light emitted from the light emitting surface of the linear light emitter is not always sufficient. Further, when the distance from the light source is increased, the light attenuation rate is large and sufficient brightness cannot be obtained, and the difference in brightness between the position close to and the distance from the light source is large and difficult to see. Therefore, there has been a demand for a linear light-emitting body that can obtain a clearer light emission. Moreover, when using a linear light-emitting body for an induction heating cooker, if the number of light sources is increased in order to make it easy to see, linear light emission is interrupted at the light source part, and the number of parts increases, resulting in an increase in price. There was a problem.

  The present invention solves the above-described conventional problems, and provides a linear light emitter on the outer periphery of the induction heating coil that has a small difference in brightness and is easy to obtain a clear continuous ring. An object of the present invention is to provide an induction heating cooker that can be clearly displayed.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a top plate provided on an upper portion of a main body constituting an outer shell, an induction heating coil for induction-heating an object to be heated, and a lower portion of the top plate. A light reflection layer that includes a light source provided around or in the vicinity of the induction heating coil and a linear light emitter having an annular light guide that guides light from the light source; and the light guide reflects light and an annular portion having a light emitting surface for emitting light provided in parallel to face the light reflecting layer to the outside, at least for taking light from the light source, chromatic and two pair of the light input portion And the set of light incident portions are arranged such that the traveling directions of the light from the set of light incident portions in the light guide are opposite to each other and the set of light incident portions are optical paths. the along the outer circumferential surface of the annular portion so as not to cross provided Rutotomoni, wherein A light source is provided between a pair of light incident portions, and the light emitting surfaces between the pair of light incident portions are arranged close to each other so that the light emitting surfaces are not darker than other portions of the light emitting surfaces. A light source is added between a pair of light entering portions, and the entire light emitting surface is caused to emit light on the top plate by light emitted from the light emitting surface so as to draw a complete annular figure. With this configuration, since the light attenuation directions are opposite to each other, they can compensate for each other and the difference in brightness of the light emitting surface can be reduced, so that the linear light emitter is provided along the inner periphery and / or outer periphery of the annular light guide. In addition, since the light incident part does not cross the optical path, the entire annular part can emit light.

  As described above, according to the present invention, a clear annular figure with little difference in brightness can be drawn on the top plate, and the heating range of the heating unit corresponding to the induction heating coil can be clearly displayed. .

According to the first aspect of the present invention, there is provided a top plate provided on the upper part of the main body constituting the outer shell, an induction heating coil for induction heating the object to be heated, and provided around or near the induction heating coil below the top plate. A linear light emitter having an annular light guide for guiding the light of the light source, the light guide facing the light reflecting layer reflecting the light and the light reflecting layer in parallel. an annular portion having a light emitting surface that emits light to the outside provided Te, for taking light from the light source at least has two pair of light entrance portion, said pair of light entrance portion, Outside the annular portion so that the light traveling directions from the pair of light incident portions in the light guide are opposite to each other and the pair of light incident portions do not cross the optical path. along the circumferential surface provided Rutotomoni, wherein the light source is provided between a pair of light entering part of the set The light emitting surfaces between the light incident portions are made closer to each other so that the light emitting surfaces are not darker than other portions of the light emitting surfaces, or a light source is added between the light incident portions. The induction heating cooker is configured such that the entire light emitting surface of the annular portion is emitted on the top plate by light emitted from the top plate so as to draw a complete annular figure. With this configuration, since the damping direction of the light is opposite the direction it is possible to reduce the difference in brightness of the light emitting surface Oginaiai each other, so provided along the outer circumference of the annular light guide body, the outer shape of the linear light emitter smaller In addition, since the light incident part does not cross the optical path, the entire annular part can emit light.

Also, the linear light emitters comprises at least two pair of light entrance portion provided along the outer peripheral surface of the annular portion of the light guide, by providing the light source between the pair of the light input portion The outer shape of the linear light emitter can be reduced, and when the pair of light incident portions are separated from each other, the interval becomes dark. However, a light source may be added between the pair of light incident portions .

According to a second aspect of the present invention, there is provided a top plate provided on an upper portion of a main body constituting the outer shell, an induction heating coil for induction heating an object to be heated, and provided around or near the induction heating coil below the top plate. And a linear light emitter having an annular light guide for guiding light from the light source, the light guide being provided facing the light reflecting layer and the light reflecting layer. and having a light emitting surface that emits light to the outside and, at least for taking light from the light source, the two have a pair with the light incident portion, said pair of light entrance portion, the guide The annular light guide is arranged so that the traveling directions of the lights from the set of light entering portions in the light body are in opposite directions and the set of light entering portions do not cross the optical path. provided along the inner circumferential surface and / or outer peripheral surface, it is emitted from the light emitting surface The linear illuminator is configured so that light paths incident on the annular portion from at least one pair of light incident portions intersect with each other. The distance between the light incident portions can be shortened, and the portion having an annular shape with almost no optical path can be eliminated, and the dark portion on the annular shape can be eliminated.

In the invention described in claim 3 , in particular, the linear light emitter has a structure in which at least one pair of light incident portions is provided in steps, so that loss due to crossing and interference of optical paths can be prevented.

According to a fourth aspect of the present invention, in particular, the linear light emitter has a quadrilateral cross section of the light guide, the light reflecting layer is provided on one side facing the light emitting surface, and the light reflecting layer is formed from the light emitting surface. By forming a coating film having a predetermined thickness or more provided by painting to obtain a predetermined luminous intensity to be emitted, the light emitting surface is a flat surface, so that light emission from the light emitting surface is parallel and difficult to diffuse. The reflective layer is a coating having a thickness greater than a predetermined thickness provided by painting to obtain a predetermined luminous intensity radiated from the light emitting surface, so that the reflection is good and clear light emission is obtained, and light leakage from this portion is small. Light can reach far away, and the difference between light and dark can be reduced. Further, since the coating is performed by coating, it is easy to obtain a coating film having a predetermined thickness or more, and workability is improved.

In the invention according to claim 5 , in particular, in the linear light emitter, the cross-sectional shape of the light incident surface of the light incident portion is the same as the cross sectional shape of the light guide, or the cross sectional area of the light incident portion is By making it larger than the cross-sectional area of the light guide, light leakage at the boundary surface between the light incident portion and the annular portion can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the linear light-emitting body as used in the field of this invention is a light-emitting body from which a light emission part light-emits linearly, and corresponds to a rod-shaped body, an annular body, or an elliptical ring body.

( Reference form 1)
FIG. 1 is a perspective view of a main part of a linear light emitter according to Reference Embodiment 1 of the present invention. FIG. 2A is a plan view of another example of the linear light emitter, and FIG. ) To (d) are sectional views of the other linear light emitters A to D, and FIG. 3 is a schematic diagram relating to the definition of the viewing angle of the light source.

  The configuration of the linear light emitter 10 will be described with reference to FIG. A light source 11 uses a light bulb, an organic EL, 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. The light reflecting layer 13 is composed of a coating film obtained by applying a silicon paint or a urethane paint. The coating film preferably has a light transmittance of 20% or less and a light reflectance of 80% or more. As described later, the light intensity emitted from the light emitting surface 14 varies depending on the configuration of the light reflecting layer 13.

  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, the light emission from the light emitting surface becomes parallel and difficult to diffuse. For this reason, clear linear light emission can be obtained along the light traveling direction of the light guide. Of course, the cross section of the light guide 12 is not limited to a quadrilateral, and may be circular or other shapes. However, the direction of light emitted from the light-emitting surface differs depending on the shape. For example, in the case of a circular shape, it is easy to spread, so that it is difficult to obtain a clear linear shape.

  FIG. 2A shows the case where the light guide 12 having the same shape as the annular light guide proposed prior to the present invention is formed in a ring shape. This annular shape is generally obtained by resin molding.

  The brightness and clarity of light obtained from the light emitting surface is affected by the configuration of the light reflecting layer, the luminance of the light source, and the viewing angle. The results of these experiments are described below.

(Experiment 1)
We compared the brightness and sharpness of the light emitting surface by changing the constituent materials of the light reflecting layer. Constituent materials include silicone adhesives, silicone-based opaque coatings, urethane-based opaque coatings, paints with white glass beads and paints without white glass beads used as hot melt agents, and silicone-based printing solutions. It was. Further, the samples were provided with light sources at both ends of a molded product made of an annular polycarbonate resin shown in FIG. 2A having a square cross section, and the brightness and clearness of points A and B were compared and examined.

  As a result of the experiment, the light reflection layer using the coating film obtained from the silicone-based opaque coating and the urethane-based opaque coating was brightest and clear at points A and B. The light reflecting layer made of the silicone adhesive was darker than the silicon opaque paint and the urethane opaque paint at both points A and B. This is probably because the adhesive absorbs light. The paint with beads was not very bright at points A and B, and the paint without beads at point A. This is presumably because the beads scatter light and light leaks from the side surfaces of the light guide. Further, the light reflecting layer provided with a film by printing was darker at both points A and B than the silicon-based opaque coating and the urethane-based opaque coating. This is thought to be because light leaked from this portion because the printed film was thin.

  Therefore, when using a printed film, the cost is increased, but it is considered that the characteristics can be improved by reinforcing the film portion. Further, as shown in FIGS. 2B to 2D, the light reflection layer cover 24 is integrated with an adhesive that forms a light reflection layer on the surface other than the light emitting surface, so that the light guide layer 12 can be removed from the side surface. Light leakage can be reduced, and by pouring the adhesive into the light reflection layer cover 24, the thickness of the light reflection layer can be made uniform, and uneven emission can be reduced.

(Experiment 2)
When the viewing angle of the light source is large, the brightness of the portion near the light source of the light guide can be increased, but the portion away from the light source becomes dark. (Table 1) is an experimental example showing this relationship.

  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 light emitting surface 14 of the light guide 12 is 3 mm, and the light receiving surfaces are 5, 10 and 15 mm. When the viewing angle is 20 ° or more and 30 ° or less with the cross-sectional area of the above-mentioned degree, it is possible to make the brightest place both near and far from the light source. This is presumably because when the viewing angle is wide, all of the emitted light is not incident, or light leaks outside at a portion near the light source of the light guide, so that it is difficult for light to reach far away.

  In addition, the light guide having such a quadrangular cross-sectional area is a dimension that is suitable for design and visual use in the induction heating cooker. When the cross section is circular, if the width of the light reflection layer is widened, the light guide portion is narrowed, and it is difficult to capture the amount of light necessary for light emission from the light incident portion. Conversely, if the width of the light reflection layer is narrowed, At the standing position when using the induction heating cooker, the directivity becomes strong, and a visually good one can be obtained only from directly above. Here, the viewing angle 27 is an angle connecting the light source center and two left and right points located in the 1/2 luminous intensity direction 26 of the central luminous intensity (or maximum luminous intensity) 25 of the light source 11, as shown in FIG. It is.

(Experiment 3)
FIG. 4 shows the relationship between the brightness of the LED used as the light source and the brightness of the light guide. The light guide shown in FIG. 2 is used, and the brightness at a distance of 3 cm from the light source shown in FIG. When a light source with high brightness is used, it can be brightened far, so that the number of light sources used can be reduced. In the induction heating cooker, since the annular diameter is about 23 cm, if the minimum brightness is designed to be 0.5 lux, four light sources having a luminance of 2000 mcd or two light sources having a 5000 mcd are required. In order to reduce the number of light sources, it is better to make the brightness brighter, and it is possible to emit light in the range of 1000 mcd to 10000 mcd due to the number and balance of the LEDs. Is preferably 2000 mcd or more and 6000 mcd or less.

As described above, according to this reference embodiment, the light source 11 and a light guide 12 for guiding light from the light source 11, light guide 12 is a light reflecting layer 13 and the light reflecting layer for reflecting light 13 A light-emitting surface 14 that radiates light to the outside, and the light reflecting layer 13 is a coating having a thickness greater than or equal to a predetermined thickness provided by coating to obtain a predetermined light intensity emitted from the light-emitting surface 14. Since the film is used, the linear shape can be displayed more clearly by suppressing light from leaking from the reflective layer and obtaining a predetermined luminous intensity from the issuing surface 14. For example, when it is arranged below the top plate of the induction heating cooker, it is possible to improve the usability of the user by displaying the display of the heating unit or other display clearly. In addition, since the coating film (reflective layer 12) is formed by painting, it is easier to obtain a thickness than by printing. Note that the above-mentioned light intensity above a predetermined level is a light intensity that is stored and arranged in a device and can be sufficiently recognized, and differs depending on the type or use state of the device, and may be determined in consideration of these conditions.

( Reference form 2)
In the present embodiment, a configuration for making the light guide shine brightly will be described. In addition, the same code | symbol is attached | subjected to the same structural member as the reference form 1, and the description is abbreviate | omitted.

FIG. 5 is a cross-sectional view of a linear light emitter in Reference Embodiment 2 of the present invention. In the figure, a plurality of slits 15 are provided in a part of the light guide. The slit 15 is provided at an angle with respect to the traveling direction of light, that is, obliquely provided in the light guide 3. The light from the light source 11 is guided through the light guide 12, and a part of the light is reflected by the slit 15, and is emitted from the light emitting surface 14 to the outside together with the light from the light reflecting layer 13. At this time, since the slits are provided obliquely, only the area corresponding to the projection plane is brightened. Therefore, the brightness of the portion provided with the slit can be increased. When a slit is provided at a position away from the light source 11 and the distance between the slits 15 is reduced as the distance from the light source 11 is reduced, a decrease in luminous intensity at a position away from the light source 11 can be suppressed.

FIG. 6 is a cross-sectional view of another linear light emitter A according to Reference Embodiment 2 of the present invention. In FIG. 6, a large number of notches 16, that is, slits are provided on the surface of the light emitting surface 14 of the light guide 12. Therefore, the reflection at this portion increases, and the luminous intensity from this portion can be increased. It should be noted that the same effect can be obtained by providing irregularities in addition to the notches 16. Similarly to the case described with reference to FIG. 5, when the notch 16 is provided at a position away from the light source 11 and the distance between the notches 16 is reduced as the distance from the light source 11 is decreased, the light intensity at the position away from the light source 11 is reduced. Can be suppressed.

FIG. 7 is a cross-sectional view of another linear light emitter B according to Reference Embodiment 2 of the present invention. In FIG. 7, a large number of through holes are provided in the light guide 12. When light hits the through hole 17, the light is reflected by the surface of the through hole 17 on the light source side, and the same effect as that obtained in FIGS. 5 and 6 is obtained.

FIG. 8 is a cross-sectional view of another linear light emitter C according to Reference Embodiment 2 of the present invention. In FIG. 8, the light diffuser 18 such as a large number of bubbles, metal powder or glass spheres is dispersed and mixed in the light guide 12 or the light reflecting layer 13. When these light diffuse reflection materials are exposed to light, the light is irregularly reflected here, and the scattered light is added to the light from the light reflection layer 13 and emitted from the light emitting surface 14. Therefore, brightness increases. Therefore, if the concentration of the diffused light reflecting material 18 is increased as the distance from the light source increases, the decrease in luminous intensity from the light emitting surface can be suppressed.

FIG. 9A is a cross-sectional view of another linear light-emitting body D according to Reference Embodiment 2 of the present invention, and FIG. 9B is a cross-sectional view taken along line XX. In the figure, the light guide 12 is L-shaped, a light reflecting layer 13 is provided at one end, and the other end is a light emitting surface. A prism portion 19 is provided between the light reflection layer 13 and the light emitting surface 14, and the light source 11 is positioned between the light reflection layer 13 and the prism portion 19. The prism portion 19 is configured by a 45 ° C-plane cut. Therefore, since the prism part 19 reflects the light reflected by the light reflecting layer 13 and the light from the light source 11 and emits light from the light emitting surface 14, the luminous intensity of the light emitting surface 14 is increased.

It is possible to suppress a decrease in intensity of the light-emitting surface by using at least one method in the form of the present reference as described above. However, if the intensity of the light source 11 is the same, in particular or absorbs light, because the total light amount to be or leaked it is constant, that decrease in light intensity is small in the light is less likely to reach in the distance Equivalent to. Therefore, in order to reduce the difference between light and dark, it is necessary to determine which brightness or which brightness is used as a reference, and in some cases, it is necessary to add a light source to brighten the distance in addition to the method of this reference form. is there.

( Reference form 3 )
In the present embodiment, an annular linear light emitter will be described as the linear light emitter, and in particular, a configuration in which a complete annular shape is obtained and the brightness of the annular ring is not significantly different from part to part will be described. In addition, the same code | symbol is attached | subjected to the same structural member as the reference form 1, and the description is abbreviate | omitted.

FIG. 10 is a plan view of a linear light emitter in Reference Embodiment 3 of the present invention. In FIG. 10, an annular linear light emitter includes a light source 11 and an annular light guide 20, and the annular light guide 20 includes an annular portion 21 and a light incident portion that takes in light from the light source 11. 22. The light incident portion 22 is provided at two locations on the outer peripheral surface of the annular portion 21, and one light incident portion 22a has the other incident light so that incident light from the light source travels in the same direction as the hands of the watch. The portion 22b is attached so as to travel in the direction opposite to the timepiece hand. In addition, the light paths incident on the annular part from the light incident part 22a and the light incident part 22b cross each other. By doing so, the distance between the light incident part 22a and the light incident part 22b can be shortened, and the light incident from the light incident part 22a goes around and reaches the light incident part 22b, and conversely the light incident. The light incident from the portion 22b goes around and reaches the light incident portion 22a. Therefore, since an optical path is formed in any part of the ring, it becomes difficult to produce a dark part in the ring.

Fig.11 (a) is a top view of the other linear light-emitting body A in the reference form 3 of this invention, FIG.11 (b) is a front view. As shown in the figure, the light incident portion 22a and the light incident portion 22 of the annular linear light emitter are provided in a stepped manner without overlapping. With this configuration, since the optical path of the light incident part 22a and the optical path of the light incident part 22b do not overlap, loss due to light interference can be avoided. When the linear light emitter shown in FIG. 11 is provided by integral molding, it can be easily manufactured by providing a slit between the light incident part 22a and the light incident part 22b.

  12A and 12B are plan views showing another linear light emitter B and another linear light emitter C, and FIG. 12C is a front view of another linear light emitter C. FIG. . Another linear light emitter B in FIG. 12A is a case where two light incident portions 22 are provided along the inner and outer peripheral surfaces of the annular portion 21, and the other linear light emitters in FIG. C is a case where two light incident portions 22 are provided along the outer peripheral surface of the annular portion 21. With this configuration, it is possible to reduce the outer shape of the linear light emitter and to emit light from the entire annular portion because the light incident portion does not cross the optical path. When the light incident portions are separated from each other, the light becomes dark during this period. Therefore, in the configuration of FIG. 12A, the light incident portions are overlapped, and in the configuration of FIG. 12B, a light source is added between the light incident portions. good.

FIG. 13 is a plan view of another linear light-emitting body D according to Reference Embodiment 3 of the present invention, in which a plurality of arc-shaped light guides each having a ring shape are combined to form an annular light guide. It is. In this configuration, light entering from the light incident part of one arcuate light guide does not enter the light incident part of the other arcuate light guide, so that light leakage loss can be reduced. Also, since the parts are small, handling is convenient. Furthermore, it is possible to mold in a symmetrical shape, and it is possible to reduce the size of the mold and to obtain a large number of pieces.

  10-13, if the cross-sectional shape of the light incident surface is made the same as the shape of the light guide, or the cross-sectional area of the light incident portion is larger than the cross-sectional area of the light guide, The leakage of light is reduced and the efficiency is improved.

  10-13, although the case where the light incident part was provided in two places was demonstrated, when the length of a light guide becomes long and the brightness of the position away from the light incident part becomes dark, a light source is used. Just increase it. At this time, as shown in FIGS. 10 to 13, two light sources may be provided as a set so that the total is an even number, or the odd number is provided as appropriate so that the whole light emission is as uniform as possible. It may be arranged.

Of course, the configuration described in Reference Embodiment 1 or 2 may be used.

(Embodiment 1 )
In this embodiment, the case where the linear light emitter described in Reference Embodiments 1 to 3 is used in an induction heating cooker will be described.

FIG. 14 is a schematic cross-sectional view of the induction heating cooker in Embodiment 1 of the present invention. In the figure, reference numeral 24 denotes a main body constituting the outline of the induction heating cooker, and reference numeral 25 denotes a top plate provided on the upper portion of the main body. Reference numeral 26 denotes an induction heating coil for induction heating the object to be heated. Reference numeral 27 denotes an annular linear light emitter composed of a light source 28 and a light guide 29. Reference numeral 30 denotes a control unit.

When the power is turned on in this configuration, the linear light emitter 27 emits light in a ring shape by being provided around or in the vicinity of the induction heating coil 26. At this time, since the linear light emitter 27 uses the technology and configuration described in Reference Embodiments 1 to 3 , a perfect ring-like clear figure can be drawn on the top plate, so that a sense of thermal power is displayed. Or the place where the cooked utensil is placed can be clarified. In addition, it is possible to draw a figure with little brightness over the entire ring.

  As described above, the induction heating cooker according to the present invention can draw a clear annular figure on the top plate with little difference in brightness, and clearly displays the heating range of the heating unit corresponding to the induction heating coil. Therefore, it can be applied to display on the top plate of an induction heating cooker.

The principal part perspective view of the linear light-emitting body in the reference form 1 of this invention (A) Plan view of another linear light emitter A in Reference Embodiment 1 of the present invention (b) Cross-sectional view of another linear light emitter B in Reference Embodiment 1 of the present invention (c) Reference of the present invention Sectional view of another linear light emitter C in embodiment 1 (d) Cross section of another linear light emitter D in embodiment 1 of the present invention Schematic diagram of definition of viewing angle of light source The figure which showed the relationship between the brightness | luminance of LED and the brightness of a light guide in the reference form 1 of this invention Sectional drawing of the linear light-emitting body in the reference form 2 of this invention Sectional drawing of the other linear light-emitting body A in the reference form 2 of this invention Sectional drawing of the other linear light-emitting body B in the reference form 2 of this invention Sectional drawing of the other linear light-emitting body C in the reference form 2 of this invention (A) Cross-sectional view of another linear light emitter D in Reference Embodiment 2 of the present invention (b) XX sectional view of another linear light emitter D in Reference Embodiment 2 of the present invention The top view of the linear light-emitting body in the reference form 3 of this invention (A) Plan view of another linear light emitter A in Reference Embodiment 3 of the present invention (b) Front view of another linear light emitter A in Embodiment 1 of the present invention (A) of the plan view of the other linear illuminant C in reference of the third plan view showing the other linear light emitter B (b) the present invention in reference of the third invention (c) the invention Front view of another linear light emitter C in Reference Embodiment 3 The top view of the other linear light-emitting body D in the reference form 3 of this invention Sectional schematic diagram of the induction heating cooker in Embodiment 1 of this invention. Perspective view of a conventional linear light emitter A perspective view of a conventional light emitter Perspective view of a conventional linear light emitter

Explanation of symbols

11 Light source 12 Light guide 13 Light reflection layer (reflection layer)
DESCRIPTION OF SYMBOLS 14 Light emission surface 15 Slit 17 Through-hole 18 Light diffuse reflection material 19 Prism part 20 Circular light guide 22 Light incident part 23 Arc-shaped light guide 24 Light reflection layer cover 25 Central luminous intensity 26 1/2 Light intensity direction 27 Viewing angle

Claims (5)

The top plate provided on the upper part of the main body constituting the outer shell, the induction heating coil for induction heating the object to be heated, the light source provided around or near the induction heating coil below the top plate, and the light of the light source are guided. A linear light-emitting body having an annular light guide that emits light, and the light guide emits light provided in parallel to the light reflecting layer that reflects light and the light reflecting layer to the outside. an annular portion having a light emitting surface, at least for taking light from the light source, and two pair of light entering part, said pair of light entrance portion, the in the light guide in one Rutotomoni traveling direction of each of the light from the set of light entering part is provided along the outer circumferential surface of the annular portion as a pair of light entering part and with the so that the opposite direction does not cross the optical path A light source is provided between the pair of light incident portions, and the light emitting surface between the pair of light incident portions is The top plate is caused by light emitted from the light emitting surface by adding a light source between the pair of light incident portions so as not to be darker than other portions of the light emitting surface. An induction heating cooker configured to emit light over the entire light emitting surface so as to draw a complete annular figure. The top plate provided on the upper part of the main body constituting the outer shell, the induction heating coil for induction heating the object to be heated, the light source provided around or near the induction heating coil below the top plate, and the light of the light source are guided. A linear light emitter having an annular light guide that emits light, and the light guide has a light reflecting layer that reflects light and a light emitting surface that radiates light provided facing the light reflecting layer to the outside. When, at least for taking light from the light source, the two have a pair with the light incident portion, said pair of light entrance portion from the set of light entering part of the light guide in provided each of the light traveling direction is along the inner circumferential surface and / or outer peripheral surface of the annular light guide as the light input portion of the way and the set becomes opposite direction does not cross the optical path An annular view on the top plate by light emitted from the light emitting surface The induction heating cooker is configured to draw a shape, and the linear light emitter is configured such that at least light paths incident on the annular portion from the pair of light incident portions intersect each other. The induction heating cooker according to claim 2 , wherein the linear light emitter has a configuration in which at least one set of light incident portions is provided in steps. The linear light emitter has a quadrilateral cross section of the light guide, the light reflecting layer is provided on one side facing the light emitting surface, and the light reflecting layer is painted to obtain a predetermined luminous intensity emitted from the light emitting surface. The induction heating cooker according to any one of claims 1 to 3 , wherein the coating film has a predetermined thickness or more. The linear light emitter has a configuration in which the cross-sectional shape of the light incident surface of the light incident part is the same as the cross-sectional shape of the light guide, or the cross-sectional area of the light incident part is larger than the cross-sectional area of the light guide The induction heating cooker according to any one of claims 1 to 4 .

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