EP1536668B1 - Induction heating cooker - Google Patents

Induction heating cooker Download PDF

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Publication number
EP1536668B1
EP1536668B1 EP03741372.1A EP03741372A EP1536668B1 EP 1536668 B1 EP1536668 B1 EP 1536668B1 EP 03741372 A EP03741372 A EP 03741372A EP 1536668 B1 EP1536668 B1 EP 1536668B1
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EP
European Patent Office
Prior art keywords
light
lights
light source
induction heating
heating cooker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03741372.1A
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German (de)
French (fr)
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EP1536668A1 (en
EP1536668A4 (en
Inventor
Tetsuya Kaji
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Panasonic Corp
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Panasonic Corp
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Publication date
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Publication of EP1536668A1 publication Critical patent/EP1536668A1/en
Publication of EP1536668A4 publication Critical patent/EP1536668A4/en
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Publication of EP1536668B1 publication Critical patent/EP1536668B1/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1218—Cooking devices induction cooking plates or the like and devices to be used in combination with them with arrangements using lights for heating zone state indication
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs

Definitions

  • the present invention relates to an induction heating cooker for household use and more specifically a light-emitting part for producing an optical pictogram on the top plate on which is placed a dish to be heated such as a saucepan.
  • An induction heating cooker uses a high frequency magnetic field generated by a heating coil traversed by a high frequency current and therefore an eddy current generated by this high frequency magnetic field on a pan (a charge) magnetically coupled with the heating coil.
  • This eddy current gives rise to a Joule effect heat at the pan, heat allowing the pan to heat itself and therefore to cook.
  • Induction heating cookers however, have a disadvantage: it is impossible to visually check the state of induction heating, because the pan itself heats up unlike a gas cooker for which the flames are visible and d an electric heater for which the heating part is incandescent.
  • the publication of the Japanese unexamined document N ° 2001-160483 prior art discloses a light emitting portion for solving this problem.
  • the figure 7 is a sectional view of the conventional induction heating cooker according to the prior art described in said publication.
  • a plate 2 of insulating material placed on a main body 1 forming a frame. It is on this top plate 2 is placed an object to be heated 3 such as a pan.
  • an object to be heated 3 such as a pan.
  • a heating coil 4 for heating the object to be heated 3 by induction.
  • the light-emitting portion 5 is composed of a light source 6 and a light pipe 7 and the lights diffuse from the emitting face 8 to the top plate 2 which is translucent.
  • the control of the coil and the light emitting part 5 is provided by a control block 9.
  • the heating coil 4 When the heating coil 4 is traversed by a determined high frequency current, the object to be heated 3 is heated by induction.
  • the light source 6 lights up and its lights, guided by the light pipe 7, diffuse from the light emitting face 8 to radiate the lower face of the top plate 2.
  • These lights pass through the top plate 2 and reach its upper face and an annular luminous pattern represented by hatching on the figure 8 is created on the top face of the top plate 2. This pattern allows a user of the cooker to visually perceive the area of the top plate 2 facing the (and located just above) the heated heating coil 4 at a high temperature by induction by energizing this light pattern.
  • a fan-shaped light pipe segment 7a and a light source 6 disposed on the light receiving portion 7b of the light pipe segment 7a form a block of the light pipe 7 as shown in FIG. figure 9 which is a close-up of the main parts.
  • a plurality (6 to 8 for example) of such blocks form, according to said prior art, an annular light emitting portion 5 as shown in FIG. figure 7 . It is therefore necessary to gather a good number of blocks to achieve the annular light emitting portion 5 and to carry a wiring to each light source 6 in a particularly limited space after this assembly of blocks.
  • the prior art has as disadvantages a large number of component parts and operating steps. There is also a lack of sharpness of the annular luminous pattern due to the irregularity of the luminosity and the light leakage, these two phenomena coming from the importance of the number of light sources.
  • the cooling wind beam sent by the fan (not drawn) disposed on the bottom of the main body 1 to the heating coil 4 is intercepted by the light pipe 7 and therefore the heating coil 4 is not sufficiently cooled, this is due to the fact that the disk-shaped part of the light pipe 7 is arranged under the heating coil 4.
  • the object of the present invention is to propose an induction heating cooker comprising an improved light-emitting part offering a better luminosity thanks to a lesser loss of the light transmitted in the light pipe, with less unevenness of brightness and less leakage. of lights.
  • the induction heating cooker comprises a coil carrier for carrying a heating coil, a light pipe formed on the perimeter of said heating coil, a light source emitting the lights to a light receiving portion of said duct of light and a compartment in which is stowed said light source.
  • Said coil holder and said light source form a single assembly and said coil holder is equipped with a light-tight screen avoiding any dissipation of unwanted lights. This arrangement directs the reflected lights on the coil holder to the wall of the light pipe constituting the light source compartment and intensify the lights emanating from this wall.
  • the induction heating cooker according to the present invention is defined in claim 1.
  • the induction heating cooker according to the present invention is preferably arranged such that the coil carrier is constructed to intercept lights emanating from the perimeter of the light conduit. This makes it possible to limit the light radiation of the side walls of the light pipe and to reduce the irregularities in color and brightness throughout the light pipe, since the light radiation of the light-emitting face becomes more intense.
  • the induction heating cooker according to the present invention is preferably equipped with a plate carrying a light source. Said plate, if it consists of shading material, avoids outward leakage of lights and reduces the irregularity of color and brightness.
  • the induction heating cooker according to the present invention is preferably arranged such that at least a portion of said plate is provided with a non-light-transparent layer. This arrangement prevents any leakage of lights to the outside.
  • the figure 1 is an exploded perspective view of a main portion of the induction heating cooker according to the invention.
  • the figure 2 is a top view of the light emitting face of this same induction heating cooker and the figure 3 is a sectional view according to plane III-III of the figure 2 .
  • the figure 4 is a top view of the heating coil assembly of the induction heating cooker of the exemplary embodiment.
  • the basic arrangement of the induction heating cooker according to this exemplary embodiment being substantially the same as that of the conventional cooker shown in FIG. figure 7 , the elements common to these two exemplary embodiments will be designated by the same reference and will not be described in detail. If necessary, reference will be made to figure 7 .
  • the light emitting portion 55 will be described below with reference to Figures 1 to 3 .
  • the light emitting portion 55 consists of a light source 26 and an annular light duct 30 having a quadrangular section.
  • the light pipe 30 is a translucent plastic annular piece having a quadrangular section, as shown in FIG. figure 3 .
  • the cylindrical outer and inner faces of this duct are polished mirror and the play between the outer and inner faces, ie the thickness of the cylindrical portion is uniform.
  • the light source 26 is preferably a light emitting diode.
  • Part of the cylindrical outer face of the light conduit 30 is equipped with a light receiving portion 11 for routing the lights emanating from the light source 26 towards the annular portion.
  • the light receiving portion 11 is a wedge-shaped translucent piece.
  • the light-receiving part 11 has two light-receiving faces 12 arranged face-to-face at a determined distance from the outer circumferential face 30a of the light duct 30 and a slope 11a whose thickness gradually decreases with each receiving face. of light 12 to the outer circumferential face 30a.
  • the light source 26 mounted on the plate 19 is disposed opposite each light-receiving face 12.
  • the lights emanating from the light source 26 enter the light-receiving portion 11 through its light-receiving face 12 and are introduced into the annular light conduit 30 through the wedge-shaped light-receiving portion 11.
  • the reflectivity of the joint surface between the receiving portion 11 and the light conduit 30 be zero or extremely low. It is moreover preferable, in order to improve this transmission efficiency, to use silicone oil having an optical refractive index lying between those two parts.
  • the bottom 30b of the light conduit 30 is coated with an optical reflective layer 13 such as a vacuum-evaporation layer which reflects the lumens traveling from the light conduit 30 to the bottom 30b.
  • the lights reflected on the optical reflective layer 13 diffuse the light-emitting face 14 disposed on the upper face of the light conduit 30 and upwardly or enter the air.
  • the light emitting face 14, hatched on the figure 1 does not represent a section, but means that its upper surface is rough.
  • the optical reflective layer 13 can receive on its bottom 30b a non-translucent paint and having a high reflectivity such as a silicone resin paint. It is also possible to apply glue or tape to this bottom 30b.
  • a reflective layer 13 by simple means such as a formation of irregularities.
  • the roughness of the light emitting face 14, that is to say on the upper face of the annular light pipe 30, for example by a formation of fine irregularities or a large number of shallow grooves at the level the upper part increases the amount of lights coming out of this surface.
  • the lights entering the light pipe 30 through its light receiving portion 11 are then transmitted along the light pipe 30 as shown by the arrows 40 and 41 on the figure 2 .
  • the inner side faces 14a and outer 14b of the light channel 30 are, as described above, preferably polished mirror, the lights, during their transmission along the light conduit 30, propagate between the inner side faces 14a and external 14b by repeating their total reflection and without ever escaping outside these inner side faces 14a and 14b outer.
  • the incident lights propagate in the light pipe 30 in a clockwise direction and the others in the opposite direction, since there are 2 light sources 26 radiating the 2 receiving parts.
  • the intensity of the outwardly radiated lights by the different portions of the annular light emitting face 14 of the light duct 30 is the sum of the intensities of the lights sent in both directions.
  • the intensity of the lights radiated outwards by the different portions of the light emitting face 14 is substantially uniform over the entire perimeter of the annular light emitting face 14.
  • the portion L near the light receiving portion 11 of the light conduit 30, shown in FIG. figure 2 is a point of arrival of the lights from the two light receiving portions 11 and having traveled all around the light pipe 30.
  • the amount of lights tends to decrease slightly during this journey. This is why the brightness of the light ring on the top plate vis-à-vis this part L lowers slightly and easily presents irregularities of light. In the present embodiment, this problem is solved by the arrangement described below.
  • the heating coil 4 is placed on the coil holder 15. At the bottom of this heating coil 4, there is a large space (not drawn) for putting the cooling wind directly in contact with the heating coil 4.
  • the coil-holder 15 is provided with a light-shielding side wall 15a for stopping the lights coming from the light pipe 30.
  • the perimeter of the heating coil 4 is equipped with a magnetic anti-leakage ring 16 made of a material conductor such as aluminum to prevent magnetic leakage.
  • the light pipe 30 is disposed between the ring magnetic leakage prevention device 16 and the light shield sidewall 15a of the coil holder 15.
  • the light source compartment 17 and the coil holder 15 form an assembly.
  • the light source compartment 17 is described in detail with reference to figures 1 and 4 .
  • the light source compartment 17 constitutes a private bottom space and located between the coil-holder 15 and the light pipe 30.
  • the plate will be mounted from below. 19 carrying the light source 26 and tighten it with the light-tight screen 18 covering the upper face by means of the screw 20.
  • the light-tight screen 18 and the plate 19 are respectively fixed on the above and below the light source compartment 17 with the screws 20 serving as clamping means.
  • the light-tight screen 18 is provided, on its underside, with means for reflecting the lights such as a layer of aluminum foil or a reflective paint in order to avoid any scattering of the lights of the light source 26 by the upper face and to return the lights in the light pipe 30 by reflecting on the light-tight screen 18.
  • FIG. figure 5 Another arrangement of the light-tight screen 18 consists, as shown in FIG. figure 5 disposing the light-shielding extensions 18a and 18b on the light-tight shield 48 and using this light-tight shield 48 to conceal the upper face of the light-receiving portion 11.
  • the plate 19 carries two light sources 26 located with respect to the light-receiving portions 11.
  • the upper face of the plate 19 is provided with means for reflecting the lights such as a layer of metal sheet or a reflective paint, means similar to those for the underside of the light-shielded screen 18.
  • Plate 19 of the figure 1 is equipped with a connector 21 and this connector 21 is electrically connected to the light source 26 on the plate 19.
  • the connector 21 is installed so as to be positioned in the lower part of the coil holder 15 when the plate 19 is fixed on the light source compartment 17. This arrangement facilitates the mounting of the supply wires on the connector 21.
  • the operation and the technical characteristics of the induction heating cooker thus constituted are described in detail with reference to the figures 1 and 4 .
  • the cooker is lit using a known unidentified power switch and when the heating coil 4 ( figure 4 ) is crossed by an electric current, an induced field is produced there and this field makes it possible to heat an object to be heated 3 placed on the top plate 2 (see figure 7 ) under the effect of electromagnetic induction.
  • the anti-leakage effect of the magnetic anti-leakage ring 16 disposed on the perimeter of the heating coil 4, as shown on FIG. figure 4 avoids any lateral leakage of magnetic beams.
  • the light sources 26 shown on the figure 1 turn on at the same time as the cooker ignition.
  • part L ( figure 2 ) of the light pipe 30 forming the wall of the light source compartment 17 is a point of arrival of the lights coming from the two light-receiving parts 11 and having traveled all around the light pipe 30. That is why the intensity of the lights is lowered and therefore the brightness of the light-emitting face 14 of the part L may be lower than the other parts.
  • the light source compartment 17 is provided in its upper part with a light-tight screen 18 and, in its lower part, with a plate 19.
  • the side wall of the coil-holder 15 is made of material light-tight which makes it difficult for the lights of the source 26 to leak outwards. That is why most of the lights emitted by the light source 26 but not having penetrated into the light receiving portion 11 are reflected repeatedly inside the light source compartment 17 and another portion of the lights enters the light conduit 30 through its light receiving portion 11.
  • the roughness of the upper faces of the light-receiving portion 11 makes it possible to reduce the brightness of this light emitting face. 'increase the amount of lights emanating from these faces 11c and 11d.
  • the roughness as described above of the wall 30a of the light duct 30 of the portion L as well as the inner face 30d opposite increases the amount of light penetrating into the light duct 30 and consequently to increase the amount of light emanating from the light emitting face 14 of the part L.
  • a simple arrangement of placing an annular light pipe 30 on the periphery of the heating coil 4 makes it possible to display a slightly uneven annular optical pattern on the top plate 2.
  • a light-tight screen 18 or 48 covering the light source compartment 17 not only prevents any leakage of light, but also makes the light receiving portion 11 of the light conduit 30 invisible. and the light sources 26, which contributes to the aesthetics of the induction heating cooker.
  • annular light conduit 30 has been described, but the invention is not limited to this embodiment and the light conduit may be of any shape, for example hexagonal.
  • a light pipe of given shape makes it possible to display on the top plate a pattern having this shape.
  • the shape of the section of the light pipe is not limited to a rectangle shown on the figure 3 , but can be any, for example a trapezoid.
  • the invention is not limited to this embodiment and it is possible to produce a plurality of compartments. of light source as needed if the length of the light pipe is large and if more than one source is needed.
  • the plate 19 carrying the light sources 26 passes more or less the lights, but according to the present embodiment, it is preferable that it be light-tight. This is the reason why a translucent plate is coated with a paint and part of this coating is protected by a light-shielded screen to prevent any passage of light.
  • the prohibition of any passage of light by the formation of a light-tight layer on the plate 19 makes it possible to increase the amount of light penetrating into the light pipe by its lateral wall and consequently the quantity of light. light emanating from the light-emitting face 14. This arrangement further reduces the irregularities in the brightness of the light-emitting face 14.
  • the weakness of the amount of light leakage at the bottom face of the light-emitting face 14 heating coil 15 avoids any presence of the light leak in the aim of the user looking from above and it will not experience discomfort.
  • the present embodiment thus aims to shade the light source compartment 17 and therefore to more effectively exploit the light radiation from the light source 2 and the invention is not limited to embodiment provided that it achieves this goal.
  • the lights emanating from a light source penetrate into an annular and translucent light duct by its lateral face and emerge from it by its light emitting face which is an annular lateral face of this same light duct.
  • the lights entering the light pipe pass through this ring-shaped duct by repeating a total reflection on the cylindrical face serving as a lateral wall, thus allowing the relatively uniform distribution of the lights inside the light duct and reducing the irregularities of the light. the amount of outgoing light at each annular portion. It is then possible to display an optical pattern of relatively uniform brightness.
  • the light pipe, located around the heating coil does not disturb the cooling ventilation of the coil bottom and therefore does not affect the cooling of this heating coil.
  • the present invention provides, at a fire and heater inductive induction cooker, a sharper light emitting portion providing improved brightness through less loss of light. lights transmitted in the light pipe of an optical display device by the lights emitted by the light-emitting means on the top plate generating a magnetic field for induction heating, with less unevenness of brightness and less light leakage.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Induction Heating Cooking Devices (AREA)

Description

La présente invention concerne un cuiseur à chauffage par induction à usage ménager et plus précisément une partie émettrice de lumière pour réaliser un pictogramme optique sur la plaque de dessus sur laquelle est posé un plat à chauffer tel qu'une casserole.The present invention relates to an induction heating cooker for household use and more specifically a light-emitting part for producing an optical pictogram on the top plate on which is placed a dish to be heated such as a saucepan.

Un cuiseur à chauffage par induction fait appel à un champ magnétique à haute fréquence généré par un serpentin de chauffage traversé par un courant à haute fréquence et par conséquent à un courant de Foucault généré grâce à ce champ magnétique à haute fréquence sur une casserole (une charge) couplé magnétiquement avec le serpentin de chauffage. Ce courant de Foucault donne naissance à une chaleur par effet de Joule au niveau de la casserole, chaleur permettant à la casserole de se réchauffer d'elle-même et par conséquent de cuire. Les cuiseurs à chauffage par induction présentent cependant un inconvénient : il est impossible de contrôler visuellement l'état du chauffage par induction, car la casserole elle-même se réchauffe à la différence d'un cuiseur à gaz pour lequel les flammes sont visibles et d'un appareil de chauffage électrique pour lequel la partie chauffante se met en incandescence.An induction heating cooker uses a high frequency magnetic field generated by a heating coil traversed by a high frequency current and therefore an eddy current generated by this high frequency magnetic field on a pan (a charge) magnetically coupled with the heating coil. This eddy current gives rise to a Joule effect heat at the pan, heat allowing the pan to heat itself and therefore to cook. Induction heating cookers, however, have a disadvantage: it is impossible to visually check the state of induction heating, because the pan itself heats up unlike a gas cooker for which the flames are visible and d an electric heater for which the heating part is incandescent.

La publication du document japonais non examiné N° 2001-160483 portant sur un art antérieur divulgue une partie émettrice de lumière pour résoudre ce problème. La figure 7 est une vue en coupe du cuiseur à chauffage par induction classique selon l'art antérieur décrit dans ladite publication. Sur la figure 7, on voit une plaque 2 de dessus en matériau isolant posé sur un corps principal 1 formant une bâti. C'est sur cette plaque de dessus 2 qu'est posé un objet à chauffer 3 tel qu'une casserole. Puis, on trouve, sous la plaque de dessus 2, un serpentin de chauffage 4 destiné à chauffer l'objet à chauffer 3 par induction. Enfin, sous le serpentin de chauffage 4, il y a une partie émettrice de lumière 5. La partie émettrice de lumière 5 est composée d'une source de lumière 6 et d'un conduit de lumière 7 et les lumières diffusent de la face émettrice 8 vers la plaque de dessus 2 qui est translucide. La commande du serpentin et de la partie émettrice de lumière 5 est assurée par un bloc de commande 9.The publication of the Japanese unexamined document N ° 2001-160483 prior art discloses a light emitting portion for solving this problem. The figure 7 is a sectional view of the conventional induction heating cooker according to the prior art described in said publication. On the figure 7 , we see a plate 2 of insulating material placed on a main body 1 forming a frame. It is on this top plate 2 is placed an object to be heated 3 such as a pan. Then, one finds, under the plate of above 2, a heating coil 4 for heating the object to be heated 3 by induction. Finally, under the heating coil 4, there is a light-emitting portion 5. The light-emitting portion 5 is composed of a light source 6 and a light pipe 7 and the lights diffuse from the emitting face 8 to the top plate 2 which is translucent. The control of the coil and the light emitting part 5 is provided by a control block 9.

Lorsque le serpentin de chauffage 4 est traversé par un courant à haute fréquence déterminé, l'objet à chauffer 3 est chauffé par induction. Parallèlement à cette traversée du courant, la source de lumière 6 s'allume et, ses lumières, guidées par le conduit de lumière 7, diffusent de la face émettrice de lumière 8 pour rayonner la face inférieure de la plaque de dessus 2. Ces lumières passent à travers la plaque de dessus 2 et parviennent à sa face supérieure et un motif lumineux annulaire représenté par des hachures sur la figure 8 est créé sur la face supérieure de la plaque de dessus 2. Ce motif permet à un utilisateur du cuiseur de percevoir visuellement la zone de la plaque de dessus 2 faisant face au (et se situant juste au-dessus du) serpentin de chauffage 4 porté à une haute température par induction par la mise sous tension de ce motif lumineux.When the heating coil 4 is traversed by a determined high frequency current, the object to be heated 3 is heated by induction. In parallel with this crossing of the current, the light source 6 lights up and its lights, guided by the light pipe 7, diffuse from the light emitting face 8 to radiate the lower face of the top plate 2. These lights pass through the top plate 2 and reach its upper face and an annular luminous pattern represented by hatching on the figure 8 is created on the top face of the top plate 2. This pattern allows a user of the cooker to visually perceive the area of the top plate 2 facing the (and located just above) the heated heating coil 4 at a high temperature by induction by energizing this light pattern.

Selon ledit art antérieur, un segment 7a de conduit de lumière en forme d'éventail et une source de lumière 6 disposée sur la partie réceptrice de lumière 7b du segment 7a de conduit de lumière forment un bloc du conduit de lumière 7 comme le représente la figure 9 qui est un gros plan des parties principales. Une pluralité (au nombre de 6 à 8 par exemple) de tels blocs forment, selon ledit art antérieur, une partie émettrice de lumière annulaire 5 comme représentée sur la figure 7. Il est donc nécessaire de réunir un bon nombre de blocs pour réaliser la partie émettrice de lumière annulaire 5 et de réaliser un câblage jusqu'à chaque source de lumière 6 dans un espace particulièrement limité après cet assemblage de blocs. Ainsi, l'art antérieur a comme inconvénients un nombre élevé de pièces constitutives et d'étapes opératoires. Il existe également un manque de netteté du motif lumineux annulaire dû à l'irrégularité de la luminosité et à la fuite de la lumière, ces deux phénomènes provenant de l'importance du nombre de sources de lumière.According to said prior art, a fan-shaped light pipe segment 7a and a light source 6 disposed on the light receiving portion 7b of the light pipe segment 7a form a block of the light pipe 7 as shown in FIG. figure 9 which is a close-up of the main parts. A plurality (6 to 8 for example) of such blocks form, according to said prior art, an annular light emitting portion 5 as shown in FIG. figure 7 . It is therefore necessary to gather a good number of blocks to achieve the annular light emitting portion 5 and to carry a wiring to each light source 6 in a particularly limited space after this assembly of blocks. Thus, the prior art has as disadvantages a large number of component parts and operating steps. There is also a lack of sharpness of the annular luminous pattern due to the irregularity of the luminosity and the light leakage, these two phenomena coming from the importance of the number of light sources.

De plus, comme le représente la figure 7, le faisceau du vent de refroidissement envoyé par le ventilateur (non dessiné) disposé sur le fond du corps principal 1 vers le serpentin de chauffage 4 est intercepté par le conduit de lumière 7 et par conséquent le serpentin de chauffage 4 n'est pas suffisamment refroidi, ceci est dû au fait que la partie en forme de disque du conduit de lumière 7 est disposé sous le serpentin de chauffage 4.Moreover, as the figure 7 , the cooling wind beam sent by the fan (not drawn) disposed on the bottom of the main body 1 to the heating coil 4 is intercepted by the light pipe 7 and therefore the heating coil 4 is not sufficiently cooled, this is due to the fact that the disk-shaped part of the light pipe 7 is arranged under the heating coil 4.

Les documents WO 01/41510 et EP 1 213 543 décrivent également des cuiseurs à chauffage par induction conventionnels.The documents WO 01/41510 and EP 1 213 543 also describe conventional induction heating cookers.

La présente invention a pour but de proposer un cuiseur à chauffage par induction comportant une partie émettrice de lumière améliorée offrant une meilleure luminosité grâce à une moindre perte des lumières transmises dans le conduit de lumière, avec une moindre irrégularité de là luminosité et une moindre fuite de lumières.The object of the present invention is to propose an induction heating cooker comprising an improved light-emitting part offering a better luminosity thanks to a lesser loss of the light transmitted in the light pipe, with less unevenness of brightness and less leakage. of lights.

Le cuiseur à chauffage par induction selon la présente invention comprend un porte-serpentin pour porter un serpentin de chauffage, un conduit de lumière formé sur le périmètre dudit serpentin de chauffage, une source de lumière émettant les lumières vers une partie réceptrice de lumière dudit conduit de lumière et un compartiment dans lequel est rangée ladite source de lumière. Ledit porte-serpentin et ladite de source de lumière forment un seul ensemble et ledit porte-serpentin est équipé d'un écran étanche à la lumière évitant toute dissipation des lumières indésirables. Cet agencement permet de diriger les lumières réfléchies sur le porte-serpentin vers le mur du conduit de lumière constituant le compartiment de source de lumière et d'intensifier les lumières émanant de ce mur.The induction heating cooker according to the present invention comprises a coil carrier for carrying a heating coil, a light pipe formed on the perimeter of said heating coil, a light source emitting the lights to a light receiving portion of said duct of light and a compartment in which is stowed said light source. Said coil holder and said light source form a single assembly and said coil holder is equipped with a light-tight screen avoiding any dissipation of unwanted lights. This arrangement directs the reflected lights on the coil holder to the wall of the light pipe constituting the light source compartment and intensify the lights emanating from this wall.

Le cuiseur à chauffage par induction selon la présente invention est défini dans la revendication 1.The induction heating cooker according to the present invention is defined in claim 1.

Le cuiseur à chauffage par induction selon la présente invention est préférablement agencé de telle manière que le porte-serpentin soit constitué de manière à intercepter les lumières émanant du périmètre du conduit de lumière. Cela permet de limiter les rayonnements lumineux des murs latéraux du conduit de lumière et de réduire les irrégularités de couleur et de luminosité sur tout le conduit de lumière, car les rayonnements lumineux de la face émettrice de lumière deviennent plus intenses.The induction heating cooker according to the present invention is preferably arranged such that the coil carrier is constructed to intercept lights emanating from the perimeter of the light conduit. This makes it possible to limit the light radiation of the side walls of the light pipe and to reduce the irregularities in color and brightness throughout the light pipe, since the light radiation of the light-emitting face becomes more intense.

Le cuiseur à chauffage par induction selon la présente invention est préférablement équipé d'une plaque portant une source de lumière. Ladite plaque, si elle est constituée de matériau d'ombrage, évite toute fuite de lumières vers l'extérieur et permet de réduire l'irrégularité de couleur et de luminosité.The induction heating cooker according to the present invention is preferably equipped with a plate carrying a light source. Said plate, if it consists of shading material, avoids outward leakage of lights and reduces the irregularity of color and brightness.

Le cuiseur à chauffage par induction selon la présente invention est préférablement agencé de telle manière qu'au moins une partie de ladite plaque est équipée d'une couche non transparente à la lumière. Cet agencement évite toute fuite de lumières vers l'extérieur.The induction heating cooker according to the present invention is preferably arranged such that at least a portion of said plate is provided with a non-light-transparent layer. This arrangement prevents any leakage of lights to the outside.

Le cuiseur à chauffage par induction est préférablement agencé de telle manière que la source de lumière est équipée d'un écran étanche à la lumière évitant toute dissipation indésirable de lumière. La mise en place de cet écran étanche à la lumière recouvrant la partie latérale de la source de lumière permet d'augmenter la quantité de lumière envoyée de l'avant de la source de lumière vers la face réceptrice de lumière du conduit de lumière

  • La figure 1 est une vue éclatée en perspective d'une partie principale du cuiseur à chauffage par induction selon un exemple de réalisation de l'invention.
  • La figure 2 est une vue de dessus de la face émettrice de lumière du cuiseur à chauffage par induction de l'exemple de réalisation.
  • La figure 3 est une vue en coupe selon le plan III-III de la figure 2.
  • La figure 4 est une vue de dessus de l'ensemble de serpentin de chauffage du cuiseur à chauffage par induction de l'exemple de réalisation.
  • La figure 5 est une vue de dessus montrant un autre exemple d'écran étanche à la lumière agencé dans le bloc d'alimentation de l'ensemble de serpentin de chauffage du cuiseur à chauffage par induction de l'exemple de réalisation.
  • La figure 6 est une vue en perspective d'un exemple selon lequel la source de lumière du présent exemple de réalisation est équipée d'un écran étanche à la lumière.
  • La figure 7 est une vue en coupe d'un cuiseur à chauffage par induction classique.
  • La figure 8 est une vue de dessus montrant des exemples de pictogramme affichés sur la plaque supérieure.
  • La figure 9 est une vue en perspective d'une face émettrice de lumière classique.
The induction heating cooker is preferably arranged in such a way that the light source is equipped with a light-tight screen avoiding any undesirable dissipation of light. Placing this light-tight shield over the side portion of the light source increases the amount of light sent from the front of the light source to the light receiving face of the light pipe.
  • The figure 1 is an exploded perspective view of a main portion of the induction heating cooker according to an exemplary embodiment of the invention.
  • The figure 2 is a top view of the light emitting face of the induction heating cooker of the exemplary embodiment.
  • The figure 3 is a sectional view according to plane III-III of the figure 2 .
  • The figure 4 is a top view of the heating coil assembly of the induction heating cooker of the exemplary embodiment.
  • The figure 5 is a top view showing another example of a light-tight screen arranged in the power supply unit of the heating coil assembly of the induction heating cooker of the exemplary embodiment.
  • The figure 6 is a perspective view of an example in which the light source of the present embodiment is equipped with a light-tight screen.
  • The figure 7 is a sectional view of a conventional induction heating cooker.
  • The figure 8 is a view from above showing examples of pictograms displayed on the upper plate.
  • The figure 9 is a perspective view of a light emitting face classic.

Les exemples de réalisation du cuiseur à chauffage par induction selon l'invention seront décrits ci-dessous en référence aux dessins.The embodiments of the induction heating cooker according to the invention will be described below with reference to the drawings.

La figure 1 est une vue éclatée en perspective d'une partie principale du cuiseur à chauffage par induction selon l'invention. La figure 2 est une vue de dessus de la face émettrice de lumière de ce même cuiseur à chauffage par induction et la figure 3 est une vue en coupe selon le plan III-III de la figure 2. La figure 4 est une vue de dessus de l'ensemble de serpentin de chauffage du cuiseur à chauffage par induction de l'exemple de réalisation. L'agencement de base du cuiseur à chauffage par induction selon cet exemple de réalisation étant pratiquement le même que celui du cuiseur classique montré sur la figure 7, les éléments communs à ces deux exemples de réalisation seront désignés par une même référence et ne seront pas décrits en détail. Selon la nécessité, on se référera à la figure 7.The figure 1 is an exploded perspective view of a main portion of the induction heating cooker according to the invention. The figure 2 is a top view of the light emitting face of this same induction heating cooker and the figure 3 is a sectional view according to plane III-III of the figure 2 . The figure 4 is a top view of the heating coil assembly of the induction heating cooker of the exemplary embodiment. The basic arrangement of the induction heating cooker according to this exemplary embodiment being substantially the same as that of the conventional cooker shown in FIG. figure 7 , the elements common to these two exemplary embodiments will be designated by the same reference and will not be described in detail. If necessary, reference will be made to figure 7 .

La partie émettrice de lumière 55 selon l'exemple de réalisation sera décrite ci-dessous en référence aux figures 1 à 3. Sur la figure 2, la partie émettrice de lumière 55 est constituée d'une source de lumière 26 et d'un conduit de lumière annulaire 30 ayant une section quadrangulaire. Le conduit de lumière 30 est une pièce annulaire en plastique translucide ayant une section quadrangulaire, comme le représente la figure 3. Afin d'assurer les transmissions répétées des lumières à l'intérieur du conduit de lumière annulaire 30 grâce à la réflexion totale des lumières, il est préférable que les faces extérieure et intérieure cylindriques de ce conduit soient en miroir poli et que le jeu entre les faces extérieure et intérieure, autrement dire l'épaisseur de la partie cylindrique soit uniforme. Afin d'obtenir un motif annulaire brillant et net, son matériau en plastique doit de préférence avoir un faible nombre de faisceaux de lumières à l'intérieur et un indice de réfraction optique important. La source de lumière 26 est de préférence une diode électroluminescente. Une partie de la face extérieure cylindrique du conduit de lumière 30 est équipée d'une partie réceptrice de lumière 11 permettant d'acheminer les lumières émanant de la source de lumière 26 vers la partie annulaire. La partie réceptrice de lumière 11 est une pièce translucide en forme de coin. La partie réceptrice de lumière 11 comporte deux faces réceptrices de lumière 12 disposées en face-à-face à une distance déterminée de la face circonférentielle extérieure 30a du conduit de lumière 30 et une pente 11 a dont l'épaisseur diminue graduellement de chaque face réceptrice de lumière 12 vers la face circonférentielle extérieure 30a. La source de lumière 26 montée sur la plaque 19 est disposée en face de chaque face réceptrice de lumière12. Les lumières émanant de la source de lumière 26 entrent dans la partie réceptrice de lumière 11 par sa face réceptrice de lumière 12 et sont introduites dans le conduit de lumière annulaire 30 en traversant la partie réceptrice de lumière 11 en forme de coin. Afin d'améliorer le rendement de transmission lors de cette introduction, il est préférable que la réflectivité de la surface de joint entre la partie réceptrice 11 et le conduit de lumière 30 soit nulle ou extrêmement faible. Il est d'ailleurs préférable, pour améliorer ce rendement de transmission, de faire intervenir de l'huile de silicone ayant un indice de réfraction optique se situant entre ceux de ces deux parties. Comme le montre la figure 3, le fond 30b du conduit de lumière 30 est revêtu d'une couche réfléchissante optique 13 telle qu'une couche déposée par évaporation sous vide qui réfléchit les lumières s'acheminant du conduit de lumière 30 vers le fond 30b. Les lumières réfléchies sur la couche réfléchissante optique 13 diffusent de la face émettrice de lumière 14 disposée sur la face supérieure du conduit de lumière 30 et se dirigent vers le haut ou pénètrent dans l'air. A noter que la face émettrice de lumière 14, hachurée sur la figure 1, ne représente pas une section, mais signifie que sa face supérieure est rugueuse. La couche réfléchissante optique 13 peut recevoir sur son fond 30b une peinture non translucide et ayant une réflectivité élevée telle qu'une peinture en résine de silicone. Il est également possible d'appliquer de la colle ou un ruban adhésif sur ce fond 30b. Il est d'ailleurs possible de réaliser une couche réfléchissante 13 par les moyens simples telles qu'une formation d'irrégularités. La mise en rugosité de la face émettrice de lumière 14, c'est-à-dire sur la face supérieure du conduit de lumière annulaire 30, par exemple par une formation de fines irrégularités ou d'un nombre important de rainures peu profondes au niveau de la partie haute permet d'augmenter la quantité de lumières sortant de cette surface.The light emitting portion 55 according to the embodiment will be described below with reference to Figures 1 to 3 . On the figure 2 the light emitting portion 55 consists of a light source 26 and an annular light duct 30 having a quadrangular section. The light pipe 30 is a translucent plastic annular piece having a quadrangular section, as shown in FIG. figure 3 . In order to ensure the repeated transmissions of the lights inside the annular light duct 30 thanks to the total reflection of the lights, it is preferable that the cylindrical outer and inner faces of this duct are polished mirror and the play between the outer and inner faces, ie the thickness of the cylindrical portion is uniform. In order to obtain a bright and clear annular pattern, its Plastic material should preferably have a low number of light beams inside and an important optical refractive index. The light source 26 is preferably a light emitting diode. Part of the cylindrical outer face of the light conduit 30 is equipped with a light receiving portion 11 for routing the lights emanating from the light source 26 towards the annular portion. The light receiving portion 11 is a wedge-shaped translucent piece. The light-receiving part 11 has two light-receiving faces 12 arranged face-to-face at a determined distance from the outer circumferential face 30a of the light duct 30 and a slope 11a whose thickness gradually decreases with each receiving face. of light 12 to the outer circumferential face 30a. The light source 26 mounted on the plate 19 is disposed opposite each light-receiving face 12. The lights emanating from the light source 26 enter the light-receiving portion 11 through its light-receiving face 12 and are introduced into the annular light conduit 30 through the wedge-shaped light-receiving portion 11. In order to improve the transmission efficiency during this introduction, it is preferable that the reflectivity of the joint surface between the receiving portion 11 and the light conduit 30 be zero or extremely low. It is moreover preferable, in order to improve this transmission efficiency, to use silicone oil having an optical refractive index lying between those two parts. As shown in figure 3 the bottom 30b of the light conduit 30 is coated with an optical reflective layer 13 such as a vacuum-evaporation layer which reflects the lumens traveling from the light conduit 30 to the bottom 30b. The lights reflected on the optical reflective layer 13 diffuse the light-emitting face 14 disposed on the upper face of the light conduit 30 and upwardly or enter the air. Note that the light emitting face 14, hatched on the figure 1 , does not represent a section, but means that its upper surface is rough. The optical reflective layer 13 can receive on its bottom 30b a non-translucent paint and having a high reflectivity such as a silicone resin paint. It is also possible to apply glue or tape to this bottom 30b. It is also possible to make a reflective layer 13 by simple means such as a formation of irregularities. The roughness of the light emitting face 14, that is to say on the upper face of the annular light pipe 30, for example by a formation of fine irregularities or a large number of shallow grooves at the level the upper part increases the amount of lights coming out of this surface.

Les lumières entrant dans le conduit de lumière 30 par sa partie réceptrice de lumière 11 sont alors transmises le long du conduit de lumière 30 comme le représentent les flèches 40 et 41 sur la figure 2. Comme les faces latérales intérieure 14a et extérieure 14b du conduit de lumière 30 sont, comme décrit plus haut, de préférence en miroir poli, les lumières, lors de leur transmission le long du conduit de lumière 30, se propagent entre les faces latérales intérieure 14a et extérieure 14b en répétant leur réflexion totale et sans jamais fuir à l'extérieur de ces faces latérales intérieure 14a et extérieure 14b. Selon cet exemple de réalisation, les lumières incidentes se propagent dans le conduit de lumière 30 les unes dans le sens des aiguilles d'une montre et les autres dans le sens contraire, car il y a 2 sources de lumières 26 rayonnant les 2 parties réceptrices de lumière 11, c'est-à-dire, gauche et droite, qui envoient les lumières vers le conduit de lumière 30. L'intensité des lumières rayonnées vers l'extérieur par les différentes portions de la face émettrice de lumière annulaire 14 du conduit de lumière 30 est la somme des intensités des lumières envoyées dans les deux sens. L'intensité des lumières rayonnées vers l'extérieur par les différentes portions de la face émettrice de lumière 14 est pratiquement uniforme sur tout le périmètre de la face émettrice de lumière annulaire 14.The lights entering the light pipe 30 through its light receiving portion 11 are then transmitted along the light pipe 30 as shown by the arrows 40 and 41 on the figure 2 . As the inner side faces 14a and outer 14b of the light channel 30 are, as described above, preferably polished mirror, the lights, during their transmission along the light conduit 30, propagate between the inner side faces 14a and external 14b by repeating their total reflection and without ever escaping outside these inner side faces 14a and 14b outer. According to this embodiment, the incident lights propagate in the light pipe 30 in a clockwise direction and the others in the opposite direction, since there are 2 light sources 26 radiating the 2 receiving parts. of light 11, that is to say, left and right, which send the The intensity of the outwardly radiated lights by the different portions of the annular light emitting face 14 of the light duct 30 is the sum of the intensities of the lights sent in both directions. The intensity of the lights radiated outwards by the different portions of the light emitting face 14 is substantially uniform over the entire perimeter of the annular light emitting face 14.

La partie L à proximité de la partie réceptrice de lumière 11 du conduit de lumière 30, montrée sur la figure 2, est un point d'arrivée des lumières en provenance des deux parties réceptrices de lumière 11 et ayant voyagé tout autour du conduit de lumière 30. La quantité de lumières a tendance à diminuer légèrement durant ce parcours. C'est pour cela que la luminosité de l'anneau de lumière sur la plaque de dessus vis-à-vis de cette partie L s'abaisse légèrement et présente facilement des irrégularités de lumière. Dans le présent mode de réalisation, ce problème est résolu par l'agencement décrit ci-dessous.The portion L near the light receiving portion 11 of the light conduit 30, shown in FIG. figure 2 , is a point of arrival of the lights from the two light receiving portions 11 and having traveled all around the light pipe 30. The amount of lights tends to decrease slightly during this journey. This is why the brightness of the light ring on the top plate vis-à-vis this part L lowers slightly and easily presents irregularities of light. In the present embodiment, this problem is solved by the arrangement described below.

Tout d'abord, l'agencement d'un ensemble de serpentin de chauffage du cuiseur à chauffage par induction comportant la partie émettrice de lumière 55 selon l'invention de la figure 1 sera décrit en référence à la figure 4 qui est une vue de dessus. Le serpentin de chauffage 4 est posé sur le porte-serpentin 15. Au fond de ce serpentin de chauffage 4, il y a un grand espace (non dessiné) permettant de mettre le vent de refroidissement directement en contact avec le serpent de chauffage 4. Le porte-serpentin 15 est doté d'un mur latéral pare-lumière 15a pour arrêter les lumières en provenance du conduit de lumière 30. Le périmètre du serpentin de chauffage 4 est équipé d'une bague anti-fuite magnétique 16 faite en un matériau conducteur tel que l'aluminium pour éviter toute fuite magnétique. Le conduit de lumière 30 est disposé entre la bague anti-fuite magnétique 16 et le mur latéral pare-lumière 15a du porte-serpentin 15. Le compartiment de source de lumière 17 et le porte-serpentin 15 forment un ensemble.First, the arrangement of a heating coil assembly of the induction heating cooker having the light emitting portion 55 according to the invention of the figure 1 will be described with reference to the figure 4 which is a view from above. The heating coil 4 is placed on the coil holder 15. At the bottom of this heating coil 4, there is a large space (not drawn) for putting the cooling wind directly in contact with the heating coil 4. The coil-holder 15 is provided with a light-shielding side wall 15a for stopping the lights coming from the light pipe 30. The perimeter of the heating coil 4 is equipped with a magnetic anti-leakage ring 16 made of a material conductor such as aluminum to prevent magnetic leakage. The light pipe 30 is disposed between the ring magnetic leakage prevention device 16 and the light shield sidewall 15a of the coil holder 15. The light source compartment 17 and the coil holder 15 form an assembly.

Maintenant, le compartiment de source de lumière 17 est décrit en détail en référence aux figures 1 et 4. Sur la figure 1, le compartiment de source de lumière 17 constitue un espace privé de fond et situé entre le porte-serpentin 15 et le conduit de lumière 30. Afin de placer les sources de lumière 26, 26 dans cet espace, on montera par le bas la plaque 19 portant la source de lumière 26 et la serrera avec l'écran étanche à la lumière 18 couvrant la face supérieure au moyen de la vis 20. Autrement dit, l'écran étanche à la lumière 18 et la plaque 19 sont fixés respectivement sur le dessus et sur le dessous du compartiment de source de lumière 17 avec les vis 20 servant de moyens de serrage. L'écran étanche à la lumière 18 est doté, sur sa face inférieure, de moyens pour réfléchir les lumières tels qu'une couche de feuille en aluminium ou une peinture réfléchissante afin d'éviter toute diffusion des lumières de la source de lumière 26 par la face supérieure et afin de faire rentrer les lumières dans le conduit de lumière 30 en les réfléchissant sur l'écran étanche à la lumière 18.Now, the light source compartment 17 is described in detail with reference to figures 1 and 4 . On the figure 1 , the light source compartment 17 constitutes a private bottom space and located between the coil-holder 15 and the light pipe 30. In order to place the light sources 26, 26 in this space, the plate will be mounted from below. 19 carrying the light source 26 and tighten it with the light-tight screen 18 covering the upper face by means of the screw 20. In other words, the light-tight screen 18 and the plate 19 are respectively fixed on the above and below the light source compartment 17 with the screws 20 serving as clamping means. The light-tight screen 18 is provided, on its underside, with means for reflecting the lights such as a layer of aluminum foil or a reflective paint in order to avoid any scattering of the lights of the light source 26 by the upper face and to return the lights in the light pipe 30 by reflecting on the light-tight screen 18.

Un autre agencement de l'écran étanche à la lumière 18 consiste, comme le montre la figure 5, à disposer les prolongements 18a et 18b servant d'écran étanche à la lumière sur l'écran étanche à la lumière 48 et à utiliser cet écran étanche à la lumière 48 de manière à cacher la face supérieure de la partie réceptrice de lumière 11. La plaque 19 porte deux sources de lumière 26 situées vis-à-vis des parties réceptrices de lumière 11. La face supérieure de la plaque 19 est dotée de moyens pour réfléchir les lumières tels qu'une couche de feuille métallique ou une peinture réfléchissante, moyens similaires à ceux pour la face inférieure de l'écran étanche à la lumière 18.Another arrangement of the light-tight screen 18 consists, as shown in FIG. figure 5 disposing the light-shielding extensions 18a and 18b on the light-tight shield 48 and using this light-tight shield 48 to conceal the upper face of the light-receiving portion 11. The plate 19 carries two light sources 26 located with respect to the light-receiving portions 11. The upper face of the plate 19 is provided with means for reflecting the lights such as a layer of metal sheet or a reflective paint, means similar to those for the underside of the light-shielded screen 18.

La plaque 19 de la figure 1 est équipée d'un connecteur 21 et ce connecteur 21 est relié électriquement à la source de lumière 26 sur la plaque 19. Le connecteur 21 est installé de manière à être positionné dans la partie inférieure du porte-serpentin 15 lorsque la plaque 19 est fixée sur le compartiment de source de lumière 17. Cet agencement facilite le montage des fils d'amenée sur le connecteur 21.Plate 19 of the figure 1 is equipped with a connector 21 and this connector 21 is electrically connected to the light source 26 on the plate 19. The connector 21 is installed so as to be positioned in the lower part of the coil holder 15 when the plate 19 is fixed on the light source compartment 17. This arrangement facilitates the mounting of the supply wires on the connector 21.

Maintenant, le fonctionnement et les caractéristiques techniques du cuiseur à chauffage par induction ainsi constitué sont décrits en détail en référence aux figures 1 et 4. Lorsque le cuiseur est allumé au moyen d'un interrupteur d'alimentation connu non dessiné et lorsque le serpentin de chauffage 4 (figure 4) est traversé par un courant électrique, un champ induit s'y produit et ce champ permet de chauffer un objet à chauffer 3 posé sur la plaque de dessus 2 (voir figure 7) sous l'effet d'une induction électromagnétique. A ce moment-là, l'effet anti-fuite de la bague anti-fuite magnétique 16 disposée sur le périmètre du serpentin de chauffage 4, comme montrée sur la figure 4, évite toute fuite latérale de faisceaux magnétiques. Les sources de lumière 26 montrée sur la figure 1 s'allument en même temps que l'allumage du cuiseur. Les lumières émanant des sources de lumière (diodes électroluminescences) 26 pénètrent dans le conduit de lumière 30 par la face réceptrice de lumière 12 de la partie réceptrice 11 disposée sur le conduit de lumière 30 et voyagent dans le conduit de lumière 30 le long de ses voies annulaires tout en rayonnant dans l'axe X à partir de la face émettrice 14 située sur la partie supérieure du conduit de lumière 30. Ceci permet de reproduire sur la plaque de dessus 2 un anneau optique ayant une forme similaire à celle de la face émettrice de lumière annulaire 14 du conduit de lumière 30. Cet anneau optique sert à indiquer la position du serpentin de chauffage 4. La bague anti-fuite magnétique 16 disposée sur la périphérie intérieure du conduit de lumière 30 ainsi que le mur latéral du porte-serpentin 15, disposé sur la périphérie extérieure de ce même conduit, évitent toute fuite de lumière par les faces intérieure et extérieure du conduit de lumière 30. Les lumières diffusent donc efficacement de la face émettrice de lumière 14.Now, the operation and the technical characteristics of the induction heating cooker thus constituted are described in detail with reference to the figures 1 and 4 . When the cooker is lit using a known unidentified power switch and when the heating coil 4 ( figure 4 ) is crossed by an electric current, an induced field is produced there and this field makes it possible to heat an object to be heated 3 placed on the top plate 2 (see figure 7 ) under the effect of electromagnetic induction. At this time, the anti-leakage effect of the magnetic anti-leakage ring 16 disposed on the perimeter of the heating coil 4, as shown on FIG. figure 4 , avoids any lateral leakage of magnetic beams. The light sources 26 shown on the figure 1 turn on at the same time as the cooker ignition. The lights emanating from the light sources (light-emitting diodes) 26 enter the light pipe 30 through the light-receiving face 12 of the receiving part 11 disposed on the light pipe 30 and travel in the light pipe 30 along its lengths. annular channels while radiating in the X axis from the emitting face 14 located on the upper part of the light pipe 30. This allows to reproduce on the top plate 2 an optical ring having a shape similar to that of the face light emitting annular 14 of the light pipe 30. This optical ring is used to indicate the position of the heating coil 4. The magnetic anti-leakage ring 16 disposed on the inner periphery of the light pipe 30 and the side wall of the coil holder 15, disposed on the outer periphery of the same conduit, avoid any light leakage from the inner and outer faces of the light conduit 30. The lights thus effectively diffuse from the light emitting face 14.

L'intensité des lumières émanant de la face émettrice de lumière 14 diminue légèrement au fur et à mesure de leur éloignement de la partie réceptrice de lumière 11, car ces lumières pénétrant par la partie réceptrice de lumière 11 sont circulairement guidées à l'intérieur du conduit de lumière 30 tout en rayonnant vers l'extérieur. En particulier, la partie L (figure 2) du conduit de lumière 30 formant le mur du compartiment de source de lumière 17 est un point d'arrivée des lumières en provenance des deux parties réceptrices de lumière 11 et ayant voyagé tout autour du conduit de lumière 30. C'est pour cela que l'intensité des lumières s'abaisse et donc que la luminosité de la face émettrice de lumière 14 de la partie L risque d'être moins élevée que les autres parties.The intensity of the lights emanating from the light-emitting face 14 decreases slightly as they move away from the light-receiving portion 11, since these lights penetrating through the light-receiving portion 11 are circularly guided within the light-receiving portion 11. led light 30 while radiating outwardly. In particular, part L ( figure 2 ) of the light pipe 30 forming the wall of the light source compartment 17 is a point of arrival of the lights coming from the two light-receiving parts 11 and having traveled all around the light pipe 30. That is why the intensity of the lights is lowered and therefore the brightness of the light-emitting face 14 of the part L may be lower than the other parts.

Dans le présent mode de réalisation, il y a un agencement décrit ci-dessous pour compenser la réduction de la quantité de lumières émises par la face émettrice de lumière 14 de la partie L. Comme le montre la figure 1, le compartiment de source de lumière 17 est doté, dans sa partie supérieure, d'un écran étanche à la lumière 18 et, dans sa partie inférieure, d'une plaque 19. Le mur latéral du porte-serpentin 15 est fait en matériau étanche à la lumière qui rend difficile la fuite des lumières de la source 26 vers l'extérieur. C'est pour cela que la plupart des lumières émises par la source de lumière 26 mais n'ayant pas pénétré dans la partie réceptrice de lumière 11 sont réfléchies d'une manière répétée à l'intérieur du compartiment de source de lumière 17 et une autre partie des lumières pénètre dans le conduit de lumière 30 par sa partie réceptrice de lumière 11. Encore une autre partie des lumières pénètre dans le conduit de lumière 30 par son mur 30a formé sur la surface rugueuse de ce conduit de lumière 30. Cet agencement permet d'augmenter la quantité de lumière à proximité du mur 30a du conduit de lumière 30 constituant le compartiment de source de lumière 17. Il en résulte une augmentation de la quantité de lumières émanant de la face émettrice de lumière à proximité du mur 30a et par conséquent une réduction des irrégularités de la luminosité de la face émettrice de lumière 14. Cet agencement peut améliorer le rendement d'utilisation des lumières émises par la source de lumière 26.In the present embodiment, there is an arrangement described below to compensate for the reduction in the amount of light emitted by the light-emitting face 14 of the L-part. As shown in FIG. figure 1 the light source compartment 17 is provided in its upper part with a light-tight screen 18 and, in its lower part, with a plate 19. The side wall of the coil-holder 15 is made of material light-tight which makes it difficult for the lights of the source 26 to leak outwards. That is why most of the lights emitted by the light source 26 but not having penetrated into the light receiving portion 11 are reflected repeatedly inside the light source compartment 17 and another portion of the lights enters the light conduit 30 through its light receiving portion 11. Yet another part of the lumens penetrates the light duct 30 through its wall 30a formed on the rough surface of this light duct 30. This arrangement makes it possible to increase the quantity of light near the wall 30a of the light duct 30 constituting the compartment of Light source 17. This results in an increase in the amount of light emanating from the light-emitting face near the wall 30a and therefore a reduction in irregularities in the brightness of the light emitting face 14. This arrangement can improve the efficiency of use of the lights emitted by the light source 26.

Il s'agit ici également d'un prolongement des deux extrémités de l'écran étanche à la lumière 18 montré sur la figure 1 pour obtenir l'écran étanche à la lumière 48 doté des prolongements 18a et 18b montré sur la figure 5, donc, si les faces supérieures 11c et 11d de la partie réceptrice de lumière 11 sont recouvertes de l'écran étanche à la lumière 48, on peut obtenir un bel anneau optique émanant de la face émettrice de lumière 14. De plus, une partie des fuites de lumière de la partie réceptrice de lumière 11 pénètre dans le mur 30a du conduit de lumière 30 à proximité de la partie réceptrice de lumière 11 et intensifie les lumières émanant de la face émettrice de lumière 14, ce qui permet de réduire les irrégularités de la luminosité de cette face émettrice de lumière 14. De surcroît, La mise en rugosité des faces supérieures de la partie réceptrice de lumière 11, par exemple par une formation des fines irrégularités ou d'un nombre important de rainures peu profondes, permet d'augmenter la quantité de lumières émanant de ces faces 11c et 11d. De plus, la mise en rugosité comme décrite ci-dessus du mur 30a du conduit de lumière 30 de la partie L ainsi que de face intérieure 30d en face permet d'augmenter la quantité de lumières pénétrant dans le conduit de lumière 30 et par conséquent d'augmenter la quantité de lumières émanant de la face émettrice de lumière 14 de la partie L.This is also an extension of the two ends of the light-shielded screen 18 shown in FIG. figure 1 to obtain the light-tight screen 48 with extensions 18a and 18b shown on the figure 5 therefore, if the upper faces 11c and 11d of the light-receiving portion 11 are covered with the light-tight shield 48, a beautiful optical ring emanating from the light emitting face 14 can be obtained. light leaks from the light receiving portion 11 enters the wall 30a of the light conduit 30 near the light receiving portion 11 and intensifies the lights emanating from the light emitting face 14, thereby reducing irregularities Moreover, the roughness of the upper faces of the light-receiving portion 11, for example by the formation of fine irregularities or a large number of shallow grooves, makes it possible to reduce the brightness of this light emitting face. 'increase the amount of lights emanating from these faces 11c and 11d. In addition, the roughness as described above of the wall 30a of the light duct 30 of the portion L as well as the inner face 30d opposite increases the amount of light penetrating into the light duct 30 and consequently to increase the amount of light emanating from the light emitting face 14 of the part L.

Ainsi, selon le présent mode de réalisation, un simple agencement consistant à placer un conduit de lumière annulaire 30 sur la périphérie du serpentin de chauffage 4 permet d'afficher un motif optique annulaire peu irrégulier sur la plaque de dessus 2.Thus, according to the present embodiment, a simple arrangement of placing an annular light pipe 30 on the periphery of the heating coil 4 makes it possible to display a slightly uneven annular optical pattern on the top plate 2.

La mise en place d'un écran étanche à la lumière 18 ou 48 recouvrant le compartiment de source de lumière 17 permet non seulement d'éviter toute fuite de lumières, mais également de rendre invisibles la partie réceptrice de lumière 11 du conduit de lumière 30 et les sources de lumière 26, ce qui contribue à l'esthétique du cuiseur à chauffage par induction.The installation of a light-tight screen 18 or 48 covering the light source compartment 17 not only prevents any leakage of light, but also makes the light receiving portion 11 of the light conduit 30 invisible. and the light sources 26, which contributes to the aesthetics of the induction heating cooker.

Dans le cadre du présent mode de réalisation, un conduit de lumière 30 de forme annulaire a été décrit, mais l'invention n'est pas limitée à ce mode de réalisation et le conduit de lumière peut être de forme quelconque, par exemple hexagonale. Un conduit de lumière de forme donnée permet d'afficher sur la plaque de dessus un motif ayant cette forme. De plus, la forme de la section du conduit de lumière n'est nullement limitée à un rectangle représenté sur la figure 3, mais peut être quelconque, par exemple un trapèze.In the context of the present embodiment, an annular light conduit 30 has been described, but the invention is not limited to this embodiment and the light conduit may be of any shape, for example hexagonal. A light pipe of given shape makes it possible to display on the top plate a pattern having this shape. In addition, the shape of the section of the light pipe is not limited to a rectangle shown on the figure 3 , but can be any, for example a trapezoid.

Dans le cadre du présent mode de réalisation, un ensemble formé du compartiment de source de lumière 17 et d'un porte-serpentin 15 a été décrit, mais il est également possible de réaliser séparément le compartiment de source de lumière 17 et de le fixer sur le porte-serpentin 15.In the present embodiment, an assembly formed of the light source compartment 17 and a coil holder 15 has been described, but it is also possible to separately make the light source compartment 17 and fix it on the coil holder 15.

Dans le cadre du présent mode de réalisation, le cas de réalisation d'un seul compartiment de source de lumière 17 a été décrit, mais l'invention n'est pas limitée à ce mode réalisation et il est possible de réaliser une pluralité de compartiments de source de lumière selon le besoin si la longueur du conduit de lumière est importante et si plusieurs sources sont nécessaires.In the context of the present embodiment, the case of producing a single light source compartment 17 has been described, but the invention is not limited to this embodiment and it is possible to produce a plurality of compartments. of light source as needed if the length of the light pipe is large and if more than one source is needed.

Dans le cadre du présent mode de réalisation, le cas de mise en place d'un mur latéral étanche à la lumière sur le porte-serpentin 15 a été décrit, mais il n'est pas nécessaire d'utiliser un mur latéral étanche à la lumière ou il n'est pas toujours nécessaire de prévoir un tel mur si la fuite de lumières à partir de la face latérale du conduit de lumière est admissible.In the context of the present embodiment, the case of setting up a light-tight side wall on the coil-carrier 15 has been described, but it is not necessary to use a watertight sidewall at the same time. light or it is not always necessary to provide such a wall if the leakage of lights from the side face of the light pipe is admissible.

En général, la plaque 19 portant les sources de lumière 26 laisse passer plus ou moins les lumières, mais, selon le présent mode de réalisation, il est préférable qu'elle soit étanche à la lumière. C'est la raison pour laquelle une plaque translucide est revêtue d'une peinture et une partie de ce revêtement est protégée par un écran étanche à la lumière afin d'éviter tout passage de lumière. De plus, l'interdiction de tout passage de lumière par la formation d'une couche étanche à la lumière sur la plaque 19 permet d'augmenter la quantité de lumière pénétrant dans le conduit de lumière par son mur latéral et par conséquent la quantité de lumière émanant de la face émettrice de lumière 14. Cette disposition permet de réduire encore les irrégularités de la luminosité de la face émettrice de lumière 14. La faiblesse de la quantité de la fuite de lumière au niveau de la face inférieure de l'ensemble de serpentin de chauffage 15 évite toute présence de la fuite de lumière dans la visée de l'utilisateur regardant de dessus et celui-ci n'éprouvera pas sensation d'inconfort.In general, the plate 19 carrying the light sources 26 passes more or less the lights, but according to the present embodiment, it is preferable that it be light-tight. This is the reason why a translucent plate is coated with a paint and part of this coating is protected by a light-shielded screen to prevent any passage of light. In addition, the prohibition of any passage of light by the formation of a light-tight layer on the plate 19 makes it possible to increase the amount of light penetrating into the light pipe by its lateral wall and consequently the quantity of light. light emanating from the light-emitting face 14. This arrangement further reduces the irregularities in the brightness of the light-emitting face 14. The weakness of the amount of light leakage at the bottom face of the light-emitting face 14 heating coil 15 avoids any presence of the light leak in the aim of the user looking from above and it will not experience discomfort.

Il est préférable de disposer un écran étanche à la lumière 50 autour de la source de lumière 26 elle-même pour éviter toute émanation des lumières dans les sens autres que celui de la face réceptrice de lumière 12, car cela revient à améliorer l'intensité des lumières incidentes à la face réceptrice de lumière 12.It is best to have a light-tight screen 50 around the light source 26 itself to prevent any emanation of the lights in the directions other than that of the light-receiving face 12, as this amounts to improving the intensity of the lights incident on the light-receiving face 12.

Le présent mode de réalisation a ainsi pour but d'ombrager le compartiment de source de lumière 17 et par conséquent d'exploiter plus efficacement les rayonnements de lumière en provenance de la source de lumière 2 et l'invention n'est pas limitée à ce mode de réalisation à condition qu'elle permette d'atteindre ce but.The present embodiment thus aims to shade the light source compartment 17 and therefore to more effectively exploit the light radiation from the light source 2 and the invention is not limited to embodiment provided that it achieves this goal.

Selon l'invention, les lumières émanant d'une source de lumière pénètrent dans un conduit de lumière annulaire et translucide par sa face latérale et en sortent par sa face émettrice de lumière qui est une face latérale annulaire de ce même conduit de lumière. Les lumières entrant dans le conduit de lumière traversent ce conduit de forme annulaire en répétant une réflexion totale sur la face cylindrique servant de mur latéral, permettant ainsi la distribution relativement uniforme des lumières à l'intérieur du conduit de lumière et de réduire les irrégularités de la quantité de lumière sortante au niveau de chaque partie annulaire. Il est alors possible d'afficher un motif optique d'une luminosité relativement uniforme. Le conduit de lumière, situé autour du serpentin de chauffage, ne perturbe pas la ventilation de refroidissement du fond de serpentin et n'affecte donc pas le refroidissement de ce serpentin de chauffage.According to the invention, the lights emanating from a light source penetrate into an annular and translucent light duct by its lateral face and emerge from it by its light emitting face which is an annular lateral face of this same light duct. The lights entering the light pipe pass through this ring-shaped duct by repeating a total reflection on the cylindrical face serving as a lateral wall, thus allowing the relatively uniform distribution of the lights inside the light duct and reducing the irregularities of the light. the amount of outgoing light at each annular portion. It is then possible to display an optical pattern of relatively uniform brightness. The light pipe, located around the heating coil, does not disturb the cooling ventilation of the coil bottom and therefore does not affect the cooling of this heating coil.

La présente invention fournit, au niveau d'un cuiseur à chauffage par induction privé de feu et d'élément chauffant, une partie émettrice de lumière plus nette offrant une meilleure luminosité grâce à une moindre perte des lumières transmises dans le conduit de lumière d'un dispositif d'affichage optique par les lumières émises par les moyens d'émission de lumières sur la plaque de dessus générant un champ magnétique pour chauffage par induction, avec une moindre irrégularité de la luminosité et une moindre fuite de lumières.The present invention provides, at a fire and heater inductive induction cooker, a sharper light emitting portion providing improved brightness through less loss of light. lights transmitted in the light pipe of an optical display device by the lights emitted by the light-emitting means on the top plate generating a magnetic field for induction heating, with less unevenness of brightness and less light leakage.

Claims (5)

  1. An induction heating cooker comprising :
    a heating coil (4) for heating a product by induction,
    a coil holder (15) for holding said heating coil (4),
    a light tube (30),
    a light source (26) emitting the lights towards a light receiving portion (11) of said light tube (30)
    and
    a compartment (17) in which is stored said light source (26),
    characterized in that
    the light tube (30) is formed on the perimeter of said heating coil (4),
    said compartment is provided between the coil holder (15) and the light tube (30), said coil holder (15) and said light source (26), forming one assembly and said coil holder (15) is fitted with a light-shielding seal (18, 48) preventing any dissipation of unwanted lights, the light-shielding seal (18, 48) intercepting the lights emanating from said light source (26) being mounted on said coil holder (15), and
    at least the upper side of said light receiving portion (11) or a portion of said light tube (30) forming a wall (30a) of said compartment (17) of light source (26) having a rough surface in order to increase the quantity of light emanating from the light emitting portion (14) of said light tube (30) in the vicinity of said light receiving portion (11) as well as reduce brightness irregularities of said light emitting portion (14).
  2. The induction heating cooker according to claim 1 in which said coil holder (15) is constituted such as to intercept the lights emanating from the perimeter of the light tube (30).
  3. The induction heating cooker according to claim 1 or 2 in which said coil holder (15) comprises a plate (19) constituted of shading material and carrying a light source (26).
  4. The induction heating cooker according to claim 3 in which at least a portion of said plate (19) is fitted with a layer that is non-transparent to light.
  5. The induction heating cooker according to claim 1 in which said light source (26) is fitted with a light-shielding seal preventing any dissipation of unwanted lights.
EP03741372.1A 2002-07-12 2003-07-14 Induction heating cooker Expired - Lifetime EP1536668B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002203840 2002-07-12
JP2002203840 2002-07-12
PCT/JP2003/008887 WO2004023846A1 (en) 2002-07-12 2003-07-14 Induction heating cooker

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EP1536668A1 EP1536668A1 (en) 2005-06-01
EP1536668A4 EP1536668A4 (en) 2012-05-16
EP1536668B1 true EP1536668B1 (en) 2014-01-08

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JP (1) JP4081086B2 (en)
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CN (1) CN100456897C (en)
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JP4569501B2 (en) * 2006-03-20 2010-10-27 パナソニック株式会社 Cooker
JP5067285B2 (en) * 2008-06-30 2012-11-07 パナソニック株式会社 Heating cooker
JP4831214B2 (en) * 2009-07-01 2011-12-07 パナソニック株式会社 Induction heating cooker
EP2458935B1 (en) 2009-07-24 2015-09-02 Panasonic Corporation Heating cooker
WO2011010428A1 (en) * 2009-07-24 2011-01-27 パナソニック株式会社 Cooking appliance
WO2012137517A1 (en) * 2011-04-08 2012-10-11 パナソニック株式会社 Inductive heating cooker
EP3104664B1 (en) 2015-06-10 2021-03-31 Electrolux Appliances Aktiebolag Hob comprising heating zone illumination means
EP3386271B1 (en) * 2017-04-07 2021-05-19 Electrolux Appliances Aktiebolag Optical system and induction hob comprising an optical system

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JPS6321297A (en) 1986-07-10 1988-01-28 Murata Mfg Co Ltd Method for producing zinc oxide piezoelectric crystal thin film
JPH0514302Y2 (en) * 1988-02-19 1993-04-16
JP2604417Y2 (en) * 1993-09-30 2000-05-15 日本精機株式会社 Display device
EP1250028B1 (en) * 1999-12-02 2011-06-29 Panasonic Corporation Induction heater for cooking
JP3405298B2 (en) * 1999-12-02 2003-05-12 松下電器産業株式会社 Induction heating cooker
JP3647721B2 (en) * 2000-05-30 2005-05-18 リンナイ株式会社 Cooker
CN2432751Y (en) * 2000-06-23 2001-05-30 北京福瑞德机电新技术公司 Electromagnetic cooking stove
JP3769462B2 (en) * 2000-12-08 2006-04-26 株式会社東芝 Cooker
JP3770154B2 (en) * 2001-12-25 2006-04-26 松下電器産業株式会社 Induction heating cooker

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EP1536668A1 (en) 2005-06-01
CN100456897C (en) 2009-01-28
JPWO2004023846A1 (en) 2006-01-05
EP1536668A4 (en) 2012-05-16
CN1669360A (en) 2005-09-14
AU2003298883A1 (en) 2004-03-29
KR20050021457A (en) 2005-03-07
KR100917726B1 (en) 2009-09-15
JP4081086B2 (en) 2008-04-23
HK1080672A1 (en) 2006-04-28

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