EP1536668B1 - Cuiseur a induction - Google Patents

Cuiseur a induction 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
Authority
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 - Fee Related
Application number
EP03741372.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1536668A1 (fr
EP1536668A4 (fr
Inventor
Tetsuya Kaji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP1536668A1 publication Critical patent/EP1536668A1/fr
Publication of EP1536668A4 publication Critical patent/EP1536668A4/fr
Application granted granted Critical
Publication of EP1536668B1 publication Critical patent/EP1536668B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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)
EP03741372.1A 2002-07-12 2003-07-14 Cuiseur a induction Expired - Fee Related EP1536668B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002203840 2002-07-12
JP2002203840 2002-07-12
PCT/JP2003/008887 WO2004023846A1 (ja) 2002-07-12 2003-07-14 誘導加熱調理器

Publications (3)

Publication Number Publication Date
EP1536668A1 EP1536668A1 (fr) 2005-06-01
EP1536668A4 EP1536668A4 (fr) 2012-05-16
EP1536668B1 true EP1536668B1 (fr) 2014-01-08

Family

ID=31972365

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03741372.1A Expired - Fee Related EP1536668B1 (fr) 2002-07-12 2003-07-14 Cuiseur a induction

Country Status (7)

Country Link
EP (1) EP1536668B1 (zh)
JP (1) JP4081086B2 (zh)
KR (1) KR100917726B1 (zh)
CN (1) CN100456897C (zh)
AU (1) AU2003298883A1 (zh)
HK (1) HK1080672A1 (zh)
WO (1) WO2004023846A1 (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4569501B2 (ja) * 2006-03-20 2010-10-27 パナソニック株式会社 加熱調理器
JP5067285B2 (ja) * 2008-06-30 2012-11-07 パナソニック株式会社 加熱調理器
JP4831214B2 (ja) * 2009-07-01 2011-12-07 パナソニック株式会社 誘導加熱調理器
WO2011010429A1 (ja) * 2009-07-24 2011-01-27 パナソニック株式会社 加熱調理器
US8772678B2 (en) * 2009-07-24 2014-07-08 Panasonic Corporation Cooktop with light emitting indicators
WO2012137517A1 (ja) * 2011-04-08 2012-10-11 パナソニック株式会社 誘導加熱調理器
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

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6321297A (ja) 1986-07-10 1988-01-28 Murata Mfg Co Ltd 酸化亜鉛圧電結晶薄膜の製造方法
JPH0514302Y2 (zh) * 1988-02-19 1993-04-16
JP2604417Y2 (ja) * 1993-09-30 2000-05-15 日本精機株式会社 表示装置
EP2101544B1 (en) * 1999-12-02 2017-05-31 Panasonic Corporation Induction-heating cooking device
JP3405298B2 (ja) * 1999-12-02 2003-05-12 松下電器産業株式会社 誘導加熱調理器
JP3647721B2 (ja) * 2000-05-30 2005-05-18 リンナイ株式会社 加熱調理器
CN2432751Y (zh) * 2000-06-23 2001-05-30 北京福瑞德机电新技术公司 电磁烹调炉
JP3769462B2 (ja) * 2000-12-08 2006-04-26 株式会社東芝 加熱調理器
JP3770154B2 (ja) * 2001-12-25 2006-04-26 松下電器産業株式会社 誘導加熱調理器

Also Published As

Publication number Publication date
KR20050021457A (ko) 2005-03-07
JP4081086B2 (ja) 2008-04-23
HK1080672A1 (en) 2006-04-28
WO2004023846A1 (ja) 2004-03-18
EP1536668A1 (fr) 2005-06-01
AU2003298883A1 (en) 2004-03-29
CN1669360A (zh) 2005-09-14
EP1536668A4 (fr) 2012-05-16
CN100456897C (zh) 2009-01-28
JPWO2004023846A1 (ja) 2006-01-05
KR100917726B1 (ko) 2009-09-15

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