EP0317022A2 - Appareil de cuisson - Google Patents

Appareil de cuisson Download PDF

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Publication number
EP0317022A2
EP0317022A2 EP88202554A EP88202554A EP0317022A2 EP 0317022 A2 EP0317022 A2 EP 0317022A2 EP 88202554 A EP88202554 A EP 88202554A EP 88202554 A EP88202554 A EP 88202554A EP 0317022 A2 EP0317022 A2 EP 0317022A2
Authority
EP
European Patent Office
Prior art keywords
cooking
filter
glass ceramic
cooking appliance
ceramic plate
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.)
Withdrawn
Application number
EP88202554A
Other languages
German (de)
English (en)
Other versions
EP0317022A3 (fr
Inventor
Alfred Mendler
Erwin Dr. Schnedler
Bruno Dr. Vitt
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.)
Bauknecht Hausgeraete GmbH
Koninklijke Philips NV
Original Assignee
Bauknecht Hausgeraete GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics 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 Bauknecht Hausgeraete GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Bauknecht Hausgeraete GmbH
Publication of EP0317022A2 publication Critical patent/EP0317022A2/fr
Publication of EP0317022A3 publication Critical patent/EP0317022A3/fr
Withdrawn legal-status Critical Current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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/744—Lamps as heat source, i.e. heating elements with protective gas envelope, e.g. halogen lamps
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator

Definitions

  • the invention relates to a cooking appliance with a cooking plate, in particular in the form of a glass ceramic plate, and at least one heating device having a light source.
  • halogen light bulbs are provided as the light source.
  • a reflector is also provided in order to reflect rays to the glass ceramic plate, which is made of material which is transparent to infrared radiation.
  • the reflector has two regions which are essentially in the form of parabolic cylinder sections, so that an essentially homogeneous radiation intensity is achieved on the hotplate.
  • glass ceramic plates for light-heated cooking appliances are in the near infrared spectral range of approximately 0.7 to 2.7 ⁇ m in essentially transparent.
  • the use of transparent glass ceramic plates in the spectral range from 0.4 to 2.7 ⁇ m is sought. This means that there is essentially no heat loss in the glass ceramic plate, so that the radiation energy can be absorbed directly from a pan base of a pan containing the items to be cooked.
  • the transparency of the glass ceramic plates used in light-heated cooking devices in contrast to the glass ceramic plates used in cooking devices with electrical heating coils and colored red-brown by transition metal oxides, means that the elements arranged below the cooktops, e.g. Halogen lamps and their electrical and mechanical connection parts are visible. This affects the appearance and thus the aesthetic effect of the cooking appliances.
  • the invention is based on the object of designing generic cooking appliances in such a way that a visual protection against heating devices or the like is provided in a simple manner substantially without reducing the transparency and thus the effectiveness of the glass ceramic plate.
  • each heating device is assigned an optical filter which is essentially opaque to at least part of the radiation in the visible light range.
  • the appearance of the cooking device is improved both during and outside the operation of the heating device, in that the aesthetic Impression disturbing view of heating devices etc. arranged under the glass ceramic plate is essentially prevented.
  • the transparency of the glass plate is not reduced, so that no heat losses occur and the essentially inertia-free controllability of the cooking appliances heated by light sources is retained.
  • the filter is attached directly to the hotplate.
  • the filter can also be formed separately from the hotplate, for example with a transparent glass plate as a support.
  • the filter is applied to at least one surface of the glass ceramic plate that can be exposed to radiation. This results in a particularly simple manufacture and a particularly simple installation of the filters together with the respective glass ceramic plates. Furthermore, the strength of the glass ceramic plates can be increased by applying filters. This applies in particular if the filter extends over the entire glass ceramic plate and not only over cooking areas assigned to a light-heated heating device.
  • the filter is also advantageous to design the filter as a dielectric interference filter with a plurality of alternately high and low refractive index layers.
  • Such light filters the effect of which on interference Partial waves split incident rays are easy to use, for example, by using the vapor deposition technique.
  • the high-index layers consist of titanium oxide with a refractive index of at least 2.30 and / or the low-index layers consist of silicon dioxide with a refractive index of approximately 1.45.
  • the filters thus essentially act as cold light mirrors, which reflect the visible light and let rays of longer wavelength pass through.
  • the filter has twenty-one layers, which are on a support in the following order and with the layer thickness distribution H / 2 LHLHLHLHLHL 'HL' HL 'HL' HL 'H / 2 are applied, each H of a titanium oxide layer with a geometric thickness of 49 nm, H / 2 a titanium oxide layer with a geometric thickness of 24.5 nm, L corresponds to a silicon oxide layer of 78 nm and L 'corresponds to a silicon oxide layer of 138 nm.
  • a hot plate designed as a glass ceramic plate or a transparent glass plate that can be arranged adjacent to it can be used as the carrier.
  • glass ceramic plates for use in cooking appliances with heating devices having a light source with a filter of the type described.
  • Such glass ceramic plates are easy to manufacture and use. They can also be used to improve the appearance and thus the overall aesthetic impression of existing cooking appliances that can be heated by light sources.
  • a cooking plate designed as a glass ceramic plate 1 is held in a manner not shown, onto which cooking pots 2 or the like containing cooking material can be placed.
  • One or more light-heated heating devices are arranged in the interior of the cooking device below the glass ceramic plate 1.
  • the single heating device shown in FIG. 1 is designated 3 overall.
  • the heating device 3 has a dark base plate 4 arranged at a distance from the glass ceramic plate, which carries a reflector 5 and mechanical and electrical connection means (not shown) for a halogen incandescent lamp 6 arranged between the glass ceramic plate 1 and the reflector 5.
  • each heating device 3 can also be assigned a plurality of, for example, parallel cylindrical halogen incandescent lamps 6 or one or more curved halogen incandescent lamps.
  • an area of the glass ceramic plate 1 assigned to the heating device 3 is acted upon by rays emanating directly from the halogen incandescent lamp 6 and by rays reflected by the reflector 5.
  • the reflector 5 can be shaped in such a way that there is an essentially homogeneous radiation distribution of the radiation incident on the glass ceramic plate 1.
  • the glass ceramic plate 1 is essentially transparent in the near infrared spectral range from 0.7 to 2.7 ⁇ m. Heat radiation emanating from the halogen incandescent lamp 6 can thus be absorbed essentially from the bottom of the saucepan 2 in order to heat the food to be cooked essentially without inertia and without loss.
  • the side of the glass ceramic plate 1 facing the reflector 6 is coated with an optical filter 7.
  • an optical filter 7 In the present exemplary embodiment, a continuous coating of the glass ceramic plate 1 is indicated; but areas of the glass ceramic plate 1 associated with heating devices 3 can also be coated with an optical filter. The strength and resistance to breakage of the glass ceramic plate 1 can also be increased in particular by a continuous coating.
  • the essentially absorption-free optical filter 7 is designed in an unillustrated manner as an interference filter and has twenty-one layers, which are applied to the glass ceramic plate 1 with the following sequence and layer thickness distribution H / 2 LHLHLHLHLHL 'HL' HL 'HL' HL 'H / 2 be applied with each H a titanium oxide layer with a geometric thickness of 49 nm, H / 2 a titanium oxide layer with a geometric thickness of 24.5 nm, L of a silicon oxide layer of 78 nm and L 'of a silicon oxide layer of 138 nm.
  • the titanium oxide layers have a refractive index of at least 2.30 and the silicon oxide layers have a refractive index of about 1.45.
  • This construction in which the filter 7 is applied in a known manner in a deposition process such as, for example, an immersion or sputtering process, directly to the side of the glass ceramic plate 1 facing the heating device 3, it acts as a cold light mirror with the transmission characteristic shown in FIG. 2. As with all interference filters, this depends on the angle of incidence.
  • the transmission characteristic 8 shown with a solid line in FIG. 2 applies to a beam 9 that strikes the glass ceramic plate 1 perpendicularly.
  • the transmission characteristic 12 shown in broken lines applies to a beam 11 that strikes the glass ceramic plate 1 at an angle of incidence 10 of approximately 45 °.
  • the halogen incandescent lamp 6 of the heating device 3 can be perceived only slightly dark red during operation.
  • a viewing angle 10 of approximately 45 ° starting from beams in the direction of the beam 11 with spectral transmission characteristic 12, a switched-on halogen incandescent lamp 6 can be perceived due to a more intense coloring with a lighter red.
  • the filter 7 is thus during and outside the operation of the heating device 3, the view of the latter is essentially obscured, so that the appearance of the cooking appliance is improved.
  • the operating state and the heating intensity of the heating device 3 are indicated in a visually appealing manner by a coloration when the halogen incandescent lamp 6 is switched on.
  • the filter 7 according to the invention can be applied to new or retrofitted glass ceramic plates 1. It can also be applied to supports which can be arranged adjacent to hot plates, such as, for example, transparent glass plates.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Surface Treatment Of Glass (AREA)
  • Induction Heating Cooking Devices (AREA)
EP19880202554 1987-11-20 1988-11-16 Appareil de cuisson Withdrawn EP0317022A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873739279 DE3739279A1 (de) 1987-11-20 1987-11-20 Kochgeraet
DE3739279 1987-11-20

Publications (2)

Publication Number Publication Date
EP0317022A2 true EP0317022A2 (fr) 1989-05-24
EP0317022A3 EP0317022A3 (fr) 1991-01-09

Family

ID=6340838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880202554 Withdrawn EP0317022A3 (fr) 1987-11-20 1988-11-16 Appareil de cuisson

Country Status (2)

Country Link
EP (1) EP0317022A3 (fr)
DE (1) DE3739279A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011671A1 (fr) * 1989-03-21 1990-10-04 Leybold Aktiengesellschaft Dispositif chauffant pour la cuisson d'aliments, notamment plaque de cuisson
EP1505354A1 (fr) * 2002-05-16 2005-02-09 Nippon Electric Glass Co., Ltd Plaque de cuisson superieure
US9483983B2 (en) 2010-12-08 2016-11-01 Schott Ag Display device, in particular for cooktops
US10184655B2 (en) 2011-06-06 2019-01-22 Schott Ag Display device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123601C2 (de) * 2001-05-15 2003-11-20 Schott Glas Kochsystem
DE102011009235A1 (de) 2011-01-22 2012-07-26 Schott Ag Festigkeitssteigernde Beschichtung auf Polyurethan-basis

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331941A (en) * 1963-12-26 1967-07-18 Monsanto Co Infrared heater
GB2137060A (en) * 1983-03-25 1984-09-26 Gen Electric Radiant-Energy Heating and/or Cooking Apparatus
DE3703342A1 (de) * 1986-02-05 1987-08-13 Nippon Electric Glass Co Infrarot-transparentglaskeramik-gegenstand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331941A (en) * 1963-12-26 1967-07-18 Monsanto Co Infrared heater
GB2137060A (en) * 1983-03-25 1984-09-26 Gen Electric Radiant-Energy Heating and/or Cooking Apparatus
DE3703342A1 (de) * 1986-02-05 1987-08-13 Nippon Electric Glass Co Infrarot-transparentglaskeramik-gegenstand

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011671A1 (fr) * 1989-03-21 1990-10-04 Leybold Aktiengesellschaft Dispositif chauffant pour la cuisson d'aliments, notamment plaque de cuisson
EP1505354A1 (fr) * 2002-05-16 2005-02-09 Nippon Electric Glass Co., Ltd Plaque de cuisson superieure
CN100398915C (zh) * 2002-05-16 2008-07-02 日本电气硝子株式会社 烹调器用顶板
EP1505354A4 (fr) * 2002-05-16 2008-10-15 Nippon Electric Glass Co Plaque de cuisson superieure
US9483983B2 (en) 2010-12-08 2016-11-01 Schott Ag Display device, in particular for cooktops
USRE48575E1 (en) 2010-12-08 2021-06-01 Schott Ag Display device, in particular for cooktops
US10184655B2 (en) 2011-06-06 2019-01-22 Schott Ag Display device

Also Published As

Publication number Publication date
DE3739279A1 (de) 1989-06-01
EP0317022A3 (fr) 1991-01-09

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