EP2648478B1 - Elément d'illumination pour un élément chauffant muni d'une zone transparente sur la plaque de cuisson et l'élément chauffant - Google Patents

Elément d'illumination pour un élément chauffant muni d'une zone transparente sur la plaque de cuisson et l'élément chauffant Download PDF

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Publication number
EP2648478B1
EP2648478B1 EP12175031.9A EP12175031A EP2648478B1 EP 2648478 B1 EP2648478 B1 EP 2648478B1 EP 12175031 A EP12175031 A EP 12175031A EP 2648478 B1 EP2648478 B1 EP 2648478B1
Authority
EP
European Patent Office
Prior art keywords
cooking zone
cooking
zone element
illumination device
hob
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.)
Active
Application number
EP12175031.9A
Other languages
German (de)
English (en)
Other versions
EP2648478A1 (fr
Inventor
Jochen Holzinger
Claus Meider
Harald Hoffmann
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.)
Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to CN201380013710.1A priority Critical patent/CN104170523B/zh
Priority to AU2013242936A priority patent/AU2013242936B2/en
Priority to PCT/EP2013/054923 priority patent/WO2013149792A1/fr
Priority to US14/375,903 priority patent/US10088145B2/en
Publication of EP2648478A1 publication Critical patent/EP2648478A1/fr
Application granted granted Critical
Publication of EP2648478B1 publication Critical patent/EP2648478B1/fr
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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
    • 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

Definitions

  • the present invention relates to a cooking zone element for a cooking hob covered by a transparent panel according to the preamble of claim 1. Additionally, the present invention relates to a cooking hob with a transparent panel according to the preamble of claim 12.
  • the cooking zones on a cooking hob are indicated. Usually, said cooking zones are indicated by printed symbols. Sometimes, the cooking zone includes an illumination device for indicating said cooking zone. Thus, each cooking zone may be indicated by a corresponding illumination device.
  • WO 2012/003991 A1 discloses an induction cooking hob with illumination equipment.
  • An intermediate layer is arranged between a panel and a chassis of the induction cooking hob.
  • One or more light emitting diodes are arranged in the centre of the induction coil.
  • the intermediate layer comprises a plurality of cutouts arranged according to a predetermined pattern within the heating zone. The light emitting diode corresponds with at least one cutout.
  • the operating temperature range of the light emitting diodes is much lower than the temperature in the surrounding of the induction coils.
  • EP 2 161 966 A1 discloses an induction heating device.
  • An infrared ray sensor for detecting infrared rays from a cooking container through a top plate is arranged below a central cutout of an induction coil.
  • a light emitting device is placed near the infrared ray sensor and emits light to the back surface of at top plate.
  • the light emitting device is controlled to stop the light emission therefrom, when the heating of the cooking container has been stopped and a predetermined time elapses at the heating-stopped state. This can improve the durability of the light emitting device.
  • the light emitting device indicates the position at which the cooking container should be placed. Further, the light emitting device detects failures in the infrared ray sensor.
  • EP 1 596 635 A1 discloses an induction heating cooker including a light-emitting display section formed in a top plate for displaying an output state of an induction heating unit.
  • the light-emitting display section includes a light-emitting element disposed below the top plate.
  • the top plate includes a portion corresponding to the light-emitting element and an induction heating coil. The portion is coated with a light transmissible thin film having such a light-transmittance characteristic that light emitted by the light-emitting element is viewed above the top plate.
  • a cylindrical protector surrounds the light-emitting element and extends from a printed circuit board nearly to the underside of the top plate.
  • a diffuser plate is attached to an upper portion of the protector.
  • the object of the present invention is achieved by the cooking zone element according to claim 1.
  • the illumination device includes at least one diffuser screen arranged in an upper portion of the central cutout of the cooking zone element and parallel to the transparent panel of the cooking hob, and the illumination device includes an optical lens enclosing an upper portion of the light source element.
  • the main idea of the present invention is that a part of the illumination device is arranged or arrangeable inside the central cutout of the cooking zone element, while another part of the illumination device is arranged or arrangeable below said central cutout.
  • the arrangement of the light source element below the central cutout of the cooking zone element allows a sufficient cooling of said light source element.
  • the area of the central cutout may be relative small in order to avoid the negative effect on the heat transfer to the centre of a pot arranged above.
  • the height of the illumination device is marginally bigger than the height of the cooking zone element or heating element.
  • the illumination device includes at least one conical light guide formed as a conical tube and arranged or arrangeable inside the central cutout of the cooking zone element.
  • the diffuser screen may cover a top side of the conical light guide.
  • the conical light guide and the diffuser screen allow a large illumination area in relation to the base area of the central cutout.
  • the illumination device includes at least one printed circuit board arranged or arrangeable below the central cutout of the cooking zone element, wherein the light source element is arranged on said printed circuit board.
  • the printed circuit board is an insulated metal substrate (IMS) aluminium printed circuit board.
  • IMS insulated metal substrate
  • the diffuser screen is made of heat resistant ceramic material.
  • the diffuser screen may be made of a semi-transparent material.
  • the diffuser screen is made of a sand blasted glass ceramic material.
  • a light shaping layer may be arranged above the diffuser screen.
  • the light shaping layer may be printed on the diffuser screen.
  • the heating element may be formed as a circular disk.
  • the illumination device is arranged inside and below the central cutout.
  • a part of the illumination device is arranged or arrangeable inside the central cutout of the cooking zone element, while another part of the illumination device is arranged or arrangeable below said central cutout.
  • the arrangement of the light source element below the central cutout of the cooking zone element allows a sufficient cooling of said light source element.
  • the heating element is an induction coil.
  • the heating element is a thick film heating element.
  • the present invention relates to a cooking hob with a transparent panel, in particular a glass ceramic panel and at least one cooking zone element, wherein the cooking hob comprises at least one cooking zone element mentioned above and/or at least one illumination device as described above.
  • the light shaping layer is a coloured coating on the bottom side of the transparent panel or glass ceramic panel.
  • the light shaping layer is a non-transparent heat resistant foil with cutouts on the bottom side of the transparent panel or glass ceramic panel.
  • the cooking hob may include at least one cooling fan for generating an air stream in order to cool the light source element of the illumination device.
  • FIG 1 illustrates a perspective view of a cooking zone element 10 with an illumination device 20 according to a preferred embodiment of the present invention.
  • the cooking zone element 10 is provided for a cooking hob covered by a panel, in particular by a glass ceramic panel.
  • the cooking zone element 10 is substantially formed as a circular disk with a central cutout 40.
  • the cooking zone element 10 includes a heating element 12.
  • the heating element 12 may be an induction coil, a thick film heating element or another heating element.
  • the heating element 12 is formed as a circular disk and includes also the central cutout 40.
  • the illumination device 20 is arranged inside the central cutout 40.
  • the illumination device 20 comprises a diffuser screen 14.
  • the diffuser screen 14 forms the top side of the illumination device 20.
  • the diffuser screen 14 closes completely or nearly the top side of the central cutout 40.
  • the diffuser screen 14 is substantially a circular disk.
  • the diffuser screen 14 includes a cut formed as a sector of a circle.
  • a temperature sensor 16 is arranged within the cut of the diffuser screen 14.
  • An elongated heat conducting element 18 extends from the temperature sensor 16 horizontally on the top side of the heating element 12. The length of the heat conducting element 18 is about the half radius of the cooking zone element 10 and/or the heating element 12.
  • the cooking zone element 10 includes two power cables 22 and a sensor cable 24.
  • the power cables 22 are provided for supplying the heating element 12.
  • the sensor cable 24 is provided for connecting the temperature sensor 16 to a control unit of the cooking hob.
  • the sensor cable 24 may include one or two wires.
  • the sensor cable 24 includes two wires.
  • FIG 2 illustrates a schematic top view of the cooking zone element 10 with the illumination device 20 according to the preferred embodiment of the present invention.
  • the heating element 12 and the central cutout 40 have a circular base area in each case.
  • the circular diffuser screen 14 includes the cut, in which the temperature sensor 16 is arranged.
  • the length of the heat conducting element 18 corresponds with the half radius of the cooking zone element 10 and/or the heating element 12.
  • FIG 3 illustrates a sectional side view of the cooking zone element 10 with the illumination device 20 along the line III-III in FIG 2 according to the preferred embodiment of the present invention.
  • the shape of the central cutout 40 is shown in FIG 3 .
  • the central cutout 40 is substantially formed as a truncated cone arranged upside-down.
  • the bigger circular surface of the truncated cone forms the top side of the central cutout 40.
  • the smaller circular surface of the truncated cone forms the bottom side of the central cutout 40.
  • the illumination device 20 is substantially arranged inside the central cutout 40. A smaller lower part of the illumination device 20 is arranged below the central cutout 40.
  • the illumination device 20 includes a conical light guide 26.
  • the conical light guide 26 is formed as a conical tube with an upper open end and a lower open end. The upper open end of the conical light guide 26 is bigger than the lower open end.
  • the shape of the conical light guide 26 corresponds with the shape of the central cutout 40.
  • the upper open end of the conical light guide 26 is covered by the diffuser screen 14.
  • FIG 4 illustrates a sectional side view of the cooking zone element 10 with the illumination device 20 along the line IV-IV in FIG 2 according to the preferred embodiment of the present invention.
  • FIG 4 clarifies that the temperature sensor 16 and the heat conducting element 18 are arranged on the top side of the cooking zone element 10.
  • the temperature sensor 16 and the heat conducting element 18 are substantially arranged at the same level as the diffuser screen 14. Further, the shape of the conical light guide 26 corresponds with the shape of the central cutout 40.
  • FIG 5 illustrates a set of exploded views of the illumination device 20 and its components according to the preferred embodiment of the present invention.
  • the circular diffuser screen 14 includes the cut formed as the sector of a circle.
  • the heat conducting element 18 is elongated and comprises a U-shaped end portion for receiving the temperature sensor 16.
  • the temperature sensor 16 is connected to the sensor cable 24.
  • the sensor cable 24 includes two wires.
  • the conical light guide 26 is formed as the conical tube with the upper open end and the lower open end.
  • the upper open end of the conical light guide 26 is covered by the diffuser screen 14.
  • the heat conducting element 18 is fixable at the conical light guide 26, wherein the temperature sensor 16 is received by the U-shaped end portion of said heat conducting element 18.
  • FIG 6 illustrates a detailed sectional side view of the illumination device 20 arranged in the cooking zone element 10 according to the preferred embodiment of the present invention.
  • the conical light guide 26 with the diffuser screen 14, the heat conducting element 18 and the temperature sensor 16 are arranged inside the central cutout 40 of the cooking zone element 10.
  • the illumination device 20 includes a light source element 30, an optical lens 28 and a printed circuit board 32.
  • the light source element 30 is a light emitting diode (LED).
  • the light source element 30 may be an ensemble of light emitting diodes.
  • the light source element 30 is installed on the printed circuit board 32.
  • the optical lens 28 encloses the upper portion of the light source element 30.
  • the light source element 30, the optical lens 28 and the printed circuit board 32 are arranged below the central cutout 40 of the cooking zone element 10.
  • the arrangement of the light source element 30, the optical lens 28 and the printed circuit board 32 below the central cutout 40 of the cooking zone element 10 allows a relative low temperature around the light source element 30. This increases the lifetime of the light source element 30 and the predetermined light distribution.
  • the conical light guide 26 allows a large illumination area in relation to the area of the central cutout 40.
  • the area of the central cutout 40 may be relative small in order to avoid the negative effect on the heat transfer to the centre of a pot.
  • the height of the illumination device 20 is marginally bigger than the height of the cooking zone element 10 or heating element 12.
  • the illumination area above the central cutout 40 is relative large, so that different illuminated shapes can be realized.
  • said illuminated shapes may be a cross, a symbol or a brand name.
  • FIG 7 illustrates a perspective view of a chassis 34 of a cooking hob including four cooking zone elements 10 according to the preferred embodiment of the present invention.
  • the chassis 34 includes a casing 36 with a bottom wall and four side walls.
  • the four cooking zone elements 10 are arranged on the bottom wall of the casing 36.
  • a user interface 38 is arranged on the bottom wall of the casing 36.
  • the four cooking zone elements 10 and the user interface 38 are inside the casing 36.
  • the chassis 34 is the cooking hob without the glass panel.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Stoves And Ranges (AREA)
  • Induction Heating Cooking Devices (AREA)

Claims (14)

  1. Élément de zone de cuisson (10) pour une plaque de cuisson recouverte d'un panneau transparent, dans lequel :
    - l'élément de zone de cuisson (10) comprend un élément chauffant (12),
    - l'élément de zone de cuisson (10) comprend une découpe centrale (40) dans une partie centrale desdits élément de zone de cuisson (10) et élément chauffant (12),
    - l'élément de zone de cuisson (10) comprend un dispositif d'éclairage (20) disposé à l'intérieur et au-dessous de la découpe centrale (40), et
    - le dispositif d'éclairage (20) comporte au moins un élément source de lumière (30) disposé au-dessous de la découpe centrale (40) de l'élément de zone de cuisson (10),
    caractérisé en ce que
    le dispositif d'éclairage (20) comporte au moins un écran diffusant (14) disposé dans une partie supérieure de la découpe centrale (40) de l'élément de zone de cuisson (10) et parallèle au panneau transparent de la plaque de cuisson, et le dispositif d'éclairage (20) comporte une lentille optique (28) entourant une partie supérieure de l'élément source de lumière (30).
  2. Élément de zone de cuisson selon la revendication 1,
    caractérisé en ce que
    le dispositif d'éclairage (20) comporte au moins un guide de lumière conique (26) formé comme un tube conique et disposé ou disposable à l'intérieur de la découpe centrale de l'élément de zone de cuisson (10).
  3. Élément de zone de cuisson selon la revendication 2,
    caractérisé en ce que
    l'écran diffusant (14) recouvre un côté supérieur du guide de lumière conique (26).
  4. Élément de zone de cuisson selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le dispositif d'éclairage (20) comporte au moins une carte de circuit imprimé (32) disposée ou disposable au-dessous de la découpe centrale (40) de l'élément de zone de cuisson (10), l'élément source de lumière (30) étant disposé sur ladite carte de circuit imprimé (32).
  5. Élément de zone de cuisson selon la revendication 4,
    caractérisé en ce que
    la carte de circuit imprimé (32) est une carte de circuit imprimé à substrat métallique isolé (IMS) en aluminium.
  6. Élément de zone de cuisson selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'écran diffusant (16) est constitué d'un matériau semi-transparent, d'un matériau céramique thermorésistant et/ou d'un matériau vitrocéramique sablé.
  7. Élément de zone de cuisson selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    une couche de façonnage de la lumière est disposée au-dessus de l'écran diffusant (16), la couche de façonnage de la lumière étant un revêtement coloré ou une feuille non transparente thermorésistante avec des découpes.
  8. Élément de zone de cuisson selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    une couche de façonnage de la lumière est imprimée sur l'écran diffusant (16), la couche de façonnage de la lumière étant un revêtement coloré ou une feuille non transparente thermorésistante avec des découpes.
  9. Élément de zone de cuisson selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément chauffant (12) est formé comme un disque circulaire.
  10. Élément de zone de cuisson selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément chauffant (12) est une bobine d'induction.
  11. Élément de zone de cuisson selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément chauffant (12) est un élément chauffant en couche épaisse.
  12. Plaque de cuisson avec un panneau transparent, en particulier un panneau vitrocéramique et au moins un élément de zone de cuisson (10),
    caractérisée en ce que
    la plaque de cuisson comprend au moins un élément de zone de cuisson (10) selon l'une quelconque des revendications 1 à 11.
  13. Plaque de cuisson selon la revendication 12,
    caractérisée en ce que
    la couche de façonnage de la lumière est un revêtement coloré ou une feuille non transparente thermorésistante avec des découpes sur le côté inférieur du panneau transparent ou du panneau vitrocéramique.
  14. Plaque de cuisson selon la revendication 12 ou 13,
    caractérisée en ce que
    la plaque de cuisson comporte au moins un ventilateur de refroidissement pour générer un courant d'air afin de refroidir l'élément source de lumière (30) du dispositif d'éclairage (20).
EP12175031.9A 2012-04-02 2012-07-05 Elément d'illumination pour un élément chauffant muni d'une zone transparente sur la plaque de cuisson et l'élément chauffant Active EP2648478B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201380013710.1A CN104170523B (zh) 2012-04-02 2013-03-12 用于由透明面板覆盖的烹饪炉台的烹饪区元件的一种照明装置以及对应的烹饪区元件和烹饪炉台
AU2013242936A AU2013242936B2 (en) 2012-04-02 2013-03-12 An illumination device for a cooking zone element of a cooking hob covered by a transparent panel and a corresponding cooking zone element and cooking hob
PCT/EP2013/054923 WO2013149792A1 (fr) 2012-04-02 2013-03-12 Dispositif d'éclairage pour un élément de zone de cuisson d'une plaque de cuisson recouverte par un panneau transparent, et élément de zone de cuisson et plaque de cuisson correspondants
US14/375,903 US10088145B2 (en) 2012-04-02 2013-03-12 Illumination device for a cooking zone element of a cooking hob covered by a transparent panel and a corresponding cooking zone element and cooking hob

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202012003278 2012-04-02

Publications (2)

Publication Number Publication Date
EP2648478A1 EP2648478A1 (fr) 2013-10-09
EP2648478B1 true EP2648478B1 (fr) 2017-11-22

Family

ID=46458315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12175031.9A Active EP2648478B1 (fr) 2012-04-02 2012-07-05 Elément d'illumination pour un élément chauffant muni d'une zone transparente sur la plaque de cuisson et l'élément chauffant

Country Status (1)

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EP (1) EP2648478B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3030042B1 (fr) 2014-12-03 2017-08-23 Electrolux Appliances Aktiebolag Plaque de cuisson à induction
EP3386271B1 (fr) 2017-04-07 2021-05-19 Electrolux Appliances Aktiebolag Système optique et plaque de cuisson à induction comprenant un système optique
EP3627964A1 (fr) 2018-09-21 2020-03-25 Electrolux Appliances Aktiebolag Dispositif d'éclairage pour zone chauffante d'une plaque de cuisson
EP3672363B1 (fr) * 2018-12-17 2021-05-05 Electrolux Appliances Aktiebolag Table de cuisson par induction comportant un équipement d'éclairage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4133408B2 (ja) * 2003-02-14 2008-08-13 株式会社東芝 誘導加熱調理器
JP5044977B2 (ja) * 2006-05-08 2012-10-10 パナソニック株式会社 誘導加熱調理器
CN101690393B (zh) * 2007-06-22 2012-08-29 松下电器产业株式会社 感应加热烹调器
EP2405713B1 (fr) 2010-07-09 2012-12-26 Electrolux Home Products Corporation N.V. Plaque de cuisson à induction avec équipement d'éclairage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2648478A1 (fr) 2013-10-09

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