EP0320874B1 - Beleuchtungseinrichtung für einen mit Mikrowellenenergie beaufschlagbaren Ofen, insbesondere einen Haushalts-Backofen - Google Patents

Beleuchtungseinrichtung für einen mit Mikrowellenenergie beaufschlagbaren Ofen, insbesondere einen Haushalts-Backofen Download PDF

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Publication number
EP0320874B1
EP0320874B1 EP88120800A EP88120800A EP0320874B1 EP 0320874 B1 EP0320874 B1 EP 0320874B1 EP 88120800 A EP88120800 A EP 88120800A EP 88120800 A EP88120800 A EP 88120800A EP 0320874 B1 EP0320874 B1 EP 0320874B1
Authority
EP
European Patent Office
Prior art keywords
lamp
cooking space
oven
incandescent
filament
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
EP88120800A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0320874A3 (de
EP0320874A2 (de
Inventor
Günter Hammerl
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.)
BSH Hausgeraete GmbH
Original Assignee
Bosch Siemens Hausgerate GmbH
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 Bosch Siemens Hausgerate GmbH filed Critical Bosch Siemens Hausgerate GmbH
Priority to AT88120800T priority Critical patent/ATE102426T1/de
Publication of EP0320874A2 publication Critical patent/EP0320874A2/de
Publication of EP0320874A3 publication Critical patent/EP0320874A3/de
Application granted granted Critical
Publication of EP0320874B1 publication Critical patent/EP0320874B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B6/64—Heating using microwaves
    • H05B6/6444—Aspects relating to lighting devices in the microwave cavity
    • 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
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows

Definitions

  • the present invention relates to a lighting device for an oven, in particular for a domestic oven, the cooking space of which can be subjected to microwave energy, using an incandescent lamp which, when placed on a lamp holder, projects freely into the cooking space, without a microwave-shielding cover, and from outside of the Cooking space is supplied with electricity via electrical connection lines.
  • the voltages induced in these lamp systems generate currents which, among other things, cause current flows to the outside and via the filaments.
  • the action of these currents can and does cause the incandescent filament of known lamp arrangements to glow when the lamp protrudes freely, ie without microwave shielding into the furnace chamber.
  • commonly used light bulbs can quickly be destroyed due to overload. Since the electromagnetic microwave field travels within the cooking space, not least because of this, in order to achieve a largely uniform exposure to the cooking space, the lighting devices exposed to the microwave energy of the lighting devices known to be used usually illuminate intermittently.
  • the most common protective measure is to shield the lighting device from the space to which microwave energy can be applied by means of a so-called perforated screen made of electrically conductive material that contacts the wall of the cooking space. Since the light bulbs should be accessible and replaceable from the cooking space, particularly in built-in appliances, the perforated cover must be detachably attached to the cooking space wall, which in turn causes problems for the microwave shielding. Especially however, the luminous efficiency, which is greatly reduced when passing through the pinhole, has a disadvantageous effect. In order to achieve sufficient lighting in the cooking space, corresponding high-performance lamps must be used, which in turn create additional problems due to their strong heat development.
  • the present invention has for its object to provide a lighting device which is simple in terms of construction and largely excludes the effects of the microwave energy radiated into the oven on the lighting device.
  • the fact that no particularly intensive microwave fields are formed in the vicinity of the lighting device, in particular the filament of the lamp, and which can affect the lamp should be taken into account.
  • a lighting device which corresponds to this specification is characterized in that an electrically conductive lamp is located in the vicinity of the filament of the lamp and is electrically conductively connected to the cooking chamber wall and has a lead-through opening for the lamp base and is oriented essentially parallel to the cooking chamber wall.
  • the grounding potential of the housing wall for the area of the lighting device is partially brought into a plane in the incandescent filament region or close to this incandescent filament region, so that no intensive microwave fields can form in this region, which could have problematic effects on the filament.
  • This measure is particularly advantageous in connection with the use of low-voltage lamps, in particular halogen spotlights for illuminating the furnace space, since such lamps have particularly small dimensions both of the filament and of the glass bulb surrounding it.
  • the through opening of the electrically conductive and electrically conductively connected disk for the lamp can be correspondingly small, so that the earth potential of the housing wall is actually brought very close to the area of the filament of the lamp via this disk.
  • the lighting device according to the invention is characterized in that the disc, which consists of electrically conductive material, is arranged set back in relation to the filament of the incandescent lamp protruding into the furnace space.
  • the protective effect for the incandescent filament of the lamp is practically maintained in this case, but it is achieved by the measure that the luminous efficacy for the cooking space is improved, in particular in addition also when the surface of this metallic surface pointing into the cooking space Disc is designed to reflect light.
  • the lighting device according to the invention is characterized in that the distance between the disc made of electrically conductive material and the live contact parts in the lamp holder of the lighting device is greater than the length of the metallic connection pins in the lamp base area.
  • the disc which is made of electrically conductive material and is grounded via the electrical connection to the device wall, also serves as protection against contact for the operator, so that contact with live parts or incorrectly charged parts, in particular when replacing the lamps, is prevented.
  • the lighting device for the cooking chamber is of a household oven with a cooking chamber 1 that can be subjected to microwave energy and is surrounded on all sides by the cooking chamber walls and a cooking chamber door containing area of a portion 2 of a cooking chamber wall shown in section.
  • a lamp holder 3 made of electrically insulating material is fastened to this section 2 of the cooking space wall. From the sockets 4 of this lamp holder 3, connecting lines 5 are led to a power supply device, a transformer, not shown.
  • insulated jacketed connecting lines 5 carry in the area of these through openings 6 and then a metallic shielding jacket 7, which also extends between the lamp holder 3 and the cooking space wall 2. Relevant radiation of microwave energy from the cooking space 1 through the through holes 6 is thereby reliably prevented, and the required microwave tightness in this area is thus ensured.
  • connector pins 10 of a halogen lamp 11 are inserted. These pins 10 are continued through the glass base 12 of the halogen lamp 11 as an essentially parallel filament carrier 13. A coiled filament (filament) 14 is stretched between the free ends of the filament carrier 13 within the glass bulb of the halogen lamp 11.
  • the halogen lamp 11 and the lamp holder 3 are covered by a glass hood 15 opposite the cooking chamber 1, so that protection against unintentional contact, against damage and against direct contamination of the halogen lamp 11 is provided.
  • a disk 16 made of electrically conductive material Parallel to the cooking space wall 2 in the area near the incandescent filament 14 is a disk 16 made of electrically conductive material, which is mechanically and mechanically supported by metallic columns 17 is electrically connected to the cooking space wall 2, arranged within the glass hood 15.
  • This disk 16 raises the ground potential of the cooking space wall 2 in a plane near the filament 14 of the lamp 11, so that no microwave field relevant for the impairment of the filament can build up in this area.
  • a feed-through opening 18 in the disk 16 made of electrically conductive material is designed in such a way that the glass bulb of the lamp 11 can be inserted and protrude through this disk 16 without any problems.
  • the incandescent filament (incandescent filament) 25 is arranged within the usually cylindrical lamp bulb 24 of the lamp 23 and is led out of the glass base via filament carriers 26 to connecting pins 27.
  • This glass base of the lamp 23 is surrounded by a tubular extension 28 molded onto the lamp holder 22.
  • a lens-shaped, transparent glass cover 29 is screwed onto a flange of the lamp housing 21 and can be unscrewed for inserting or replacing the lamp 23.
  • a disc 30 made of electrically conductive material is arranged, which is mechanically and electrically conductively connected to the lamp housing 21 via columns 31, so that the housing potential in the Area of the filament 25 is raised.
  • the distance between the disk 16 and 30 to the sockets 4 and 32 of the lamp holder 3 and 22 is chosen to be greater than the length of the connecting pins 10 and 27 of the lamp 11 and 23 in order to achieve that between the touchable and / or electrically conductive materials, there is at least a corresponding distance with regard to electrical flashovers in the event of overvoltages and creepage distances.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Drying Of Solid Materials (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
EP88120800A 1987-12-15 1988-12-13 Beleuchtungseinrichtung für einen mit Mikrowellenenergie beaufschlagbaren Ofen, insbesondere einen Haushalts-Backofen Expired - Lifetime EP0320874B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88120800T ATE102426T1 (de) 1987-12-15 1988-12-13 Beleuchtungseinrichtung fuer einen mit mikrowellenenergie beaufschlagbaren ofen, insbesondere einen haushalts-backofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3742518 1987-12-15
DE19873742518 DE3742518A1 (de) 1987-12-15 1987-12-15 Beleuchtungseinrichtung fuer einen mit mikrowellenenergie beaufschlagbaren ofen, insbesondere einen haushalts-backofen

Publications (3)

Publication Number Publication Date
EP0320874A2 EP0320874A2 (de) 1989-06-21
EP0320874A3 EP0320874A3 (de) 1991-03-27
EP0320874B1 true EP0320874B1 (de) 1994-03-02

Family

ID=6342666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120800A Expired - Lifetime EP0320874B1 (de) 1987-12-15 1988-12-13 Beleuchtungseinrichtung für einen mit Mikrowellenenergie beaufschlagbaren Ofen, insbesondere einen Haushalts-Backofen

Country Status (6)

Country Link
US (1) US4853508A (enrdf_load_stackoverflow)
EP (1) EP0320874B1 (enrdf_load_stackoverflow)
AT (1) ATE102426T1 (enrdf_load_stackoverflow)
DE (2) DE3742518A1 (enrdf_load_stackoverflow)
ES (1) ES2049242T3 (enrdf_load_stackoverflow)
YU (1) YU47176B (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464383B (sv) * 1989-07-18 1991-04-15 Whirlpool Int Mikrovaagsugn med en belysningsanordning foer upplysning av ungskaviteten
DE4003736A1 (de) * 1990-02-08 1991-08-14 Miele & Cie Beleuchtungseinrichtung fuer mikrowellenherde
DE4304523A1 (de) * 1993-02-15 1994-08-18 Bosch Siemens Hausgeraete Leuchte für Backöfen
DE4345353C2 (de) * 1993-02-15 2002-08-14 Bsh Bosch Siemens Hausgeraete Leuchte in einem Mikrowellenofen
DE4421336C2 (de) * 1994-06-17 2002-09-26 Miele & Cie Beleuchtungseinrichtung in einem Mikrowellengerät
KR970062507A (ko) * 1996-02-14 1997-09-12 김광호 전자렌지의 조명장치
US6361181B1 (en) 2000-02-28 2002-03-26 Maytag Corporation Appliance with light mounted in door
KR100468123B1 (ko) * 2002-06-29 2005-01-26 삼성전자주식회사 벽걸이형 전자렌지
USD493906S1 (en) 2003-10-17 2004-08-03 James Tech Co., Ltd. Case for microwave oven lamp
USD493559S1 (en) 2003-10-17 2004-07-27 James Tech Co., Ltd. Case for microwave oven lamp
US7931381B2 (en) * 2008-12-19 2011-04-26 Whirlpool Corporation Lighting system for cooking appliance
EP2233839B1 (en) 2009-03-28 2019-06-12 Electrolux Home Products Corporation N.V. Oven with illumination
EP2246630B1 (en) * 2009-04-30 2017-11-29 Electrolux Home Products Corporation N.V. Oven, especially domestic oven

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7831659U1 (de) * 1978-10-24 1980-04-10 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Mikrowellenherd
DE2921425C3 (de) * 1979-05-26 1985-10-10 Pistor + Boss GmbH, 5880 Lüdenscheid Elektrische Leuchte für die Ausleuchtung von Backöfen
SE444061B (sv) * 1983-03-23 1986-03-17 Philips Norden Ab Belysningsanordning vid mikrovagsugnar
US4621180A (en) * 1985-07-08 1986-11-04 Whirlpool Corporation Cavity illumination means for microwave oven
DE3606421C1 (de) * 1986-02-27 1987-04-09 Bosch Siemens Hausgeraete Beleuchtungseinrichtung fuer einen Mikrowellenherd
DE3641420A1 (de) * 1986-12-04 1988-06-09 Licentia Gmbh Mikrowellenherd
US4763638A (en) * 1987-05-14 1988-08-16 Raytheon Company Gas self-clean double wall oven

Also Published As

Publication number Publication date
ATE102426T1 (de) 1994-03-15
YU226288A (en) 1991-04-30
DE3742518A1 (de) 1989-06-29
DE3888122D1 (de) 1994-04-07
DE3742518C2 (enrdf_load_stackoverflow) 1989-09-28
ES2049242T3 (es) 1994-04-16
YU47176B (sh) 1995-01-31
US4853508A (en) 1989-08-01
EP0320874A3 (de) 1991-03-27
EP0320874A2 (de) 1989-06-21

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