EP0320874A2 - Dispositif d'éclairage pour un four chauffé par micro-ondes, en particulier un four de cuisson domestique - Google Patents
Dispositif d'éclairage pour un four chauffé par micro-ondes, en particulier un four de cuisson domestique Download PDFInfo
- Publication number
- EP0320874A2 EP0320874A2 EP19880120800 EP88120800A EP0320874A2 EP 0320874 A2 EP0320874 A2 EP 0320874A2 EP 19880120800 EP19880120800 EP 19880120800 EP 88120800 A EP88120800 A EP 88120800A EP 0320874 A2 EP0320874 A2 EP 0320874A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- cooking space
- filament
- lighting device
- oven
- 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.)
- Granted
Links
- 238000010411 cooking Methods 0.000 title claims description 41
- 239000004020 conductor Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 description 10
- 229910052736 halogen Inorganic materials 0.000 description 6
- 150000002367 halogens Chemical class 0.000 description 6
- 230000006735 deficit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012777 electrically insulating material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
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 the cooking space is supplied with electricity via electrical connecting 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 glow can and will be caused only by the action of these currents spiral known lamp arrangements, if the lamp glows freely, ie without microwave shielding protruding into the furnace, brought to glow.
- 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 light up 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 incandescent lamps should be accessible and replaceable from the cooking space, particularly in built-in appliances, the perforated panel must be releasably attached to the cooking space wall, which in turn causes problems for the microwave shielding. However, the luminous efficiency, which is greatly reduced when passing through the pinhole, is particularly disadvantageous. 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 that is simple in terms of construction and effects of in the oven radiant microwave energy largely excluded 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, in the vicinity of the filament of the lamp, an electrically conductive disc, which is electrically conductively connected to the cooking space wall and has a through opening for the lamp base, is aligned essentially parallel to the cooking space wall and is arranged around the filament .
- the grounding potential of the housing wall for the area of the lighting device is partially brought into a plane in the filament region or close to this filament region, so that this region cannot form intensive microwave fields 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 which projects 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 also when the surface of this metallic disc pointing into the cooking space is light-reflecting is trained.
- 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 contacting elements 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 operators, so that contact with live parts or incorrectly charged parts is prevented, in particular when replacing the lamps.
- FIG. 1 only a portion of a section 2 of a cooking chamber wall shown in section is shown of a household oven with a cooking chamber 1 which can be subjected to microwave energy and is surrounded on all sides by cooking chamber walls and a cooking chamber door.
- a lamp holder 3 made of electrically insulating material is attached to this section 2 of the cooking space wall. From the sockets 4 of this lamp holder, connecting lines 5 to a power supply device, a transformer, not shown.
- a power supply device a transformer, not shown.
- insulation-coated 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 chamber wall 2. This results in a relevant radiation of microwave energy from the cooking space 1 through the leadthrough tion holes 6 safely prevented and thus ensures the required microwave tightness in this area.
- 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 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 soiling of the halogen lamp 11 is provided.
- a shield 16 made of electrically conductive material which is mechanically and electrically connected to the cooking space wall 2 via metallic columns 17, is arranged inside the glass hood 15.
- This shield 16 lifts the ground potential of the cooking space wall 2 into 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 lead-through opening 18 in the shield 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 shield 16 without any problems.
- 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.
- the distance from the shield 16 or 30 to the contact elements 4 or 32 of the lamp base 3 or 22 is chosen to be greater than the length of the connecting pins 10 or 27 of the lamp 11 or 23 in order to achieve that between the touchable and / or electrically conductive materials there is a distance at least in accordance with the regulations with regard to electrical arcing in the event of overvoltages and creepage distances.
Landscapes
- 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)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
- Drying Of Solid Materials (AREA)
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 true EP0320874A2 (fr) | 1989-06-21 |
EP0320874A3 EP0320874A3 (fr) | 1991-03-27 |
EP0320874B1 EP0320874B1 (fr) | 1994-03-02 |
Family
ID=6342666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88120800A Expired - Lifetime EP0320874B1 (fr) | 1987-12-15 | 1988-12-13 | Dispositif d'éclairage pour un four chauffé par micro-ondes, en particulier un four de cuisson domestique |
Country Status (6)
Country | Link |
---|---|
US (1) | US4853508A (fr) |
EP (1) | EP0320874B1 (fr) |
AT (1) | ATE102426T1 (fr) |
DE (2) | DE3742518A1 (fr) |
ES (1) | ES2049242T3 (fr) |
YU (1) | YU47176B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0790755A2 (fr) * | 1996-02-14 | 1997-08-20 | Samsung Electronics Co., Ltd. | Dispositif d'éclairage pour four à micro-ondes |
Families Citing this family (10)
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 |
DE4304522A1 (de) * | 1993-02-15 | 1994-08-18 | Bosch Siemens Hausgeraete | Leuchte für Mikrowellenöfen |
DE4304523A1 (de) * | 1993-02-15 | 1994-08-18 | Bosch Siemens Hausgeraete | Leuchte für Backöfen |
DE4421336C2 (de) * | 1994-06-17 | 2002-09-26 | Miele & Cie | Beleuchtungseinrichtung in einem Mikrowellengerät |
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 |
US7931381B2 (en) * | 2008-12-19 | 2011-04-26 | Whirlpool Corporation | Lighting system for cooking appliance |
EP2233839B1 (fr) | 2009-03-28 | 2019-06-12 | Electrolux Home Products Corporation N.V. | Four avec dispositif d'éclairage |
EP2246630B1 (fr) * | 2009-04-30 | 2017-11-29 | Electrolux Home Products Corporation N.V. | Four, plus particulièrement un four ménager |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0120536A2 (fr) * | 1983-03-23 | 1984-10-03 | Philips Norden AB | Dispositif d'éclairage dans des fours à micro-onde |
DE3606421C1 (de) * | 1986-02-27 | 1987-04-09 | Bosch Siemens Hausgeraete | Beleuchtungseinrichtung fuer einen Mikrowellenherd |
Family Cites Families (5)
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 |
US4621180A (en) * | 1985-07-08 | 1986-11-04 | Whirlpool Corporation | Cavity illumination means for microwave oven |
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 |
-
1987
- 1987-12-15 DE DE19873742518 patent/DE3742518A1/de active Granted
-
1988
- 1988-12-13 AT AT88120800T patent/ATE102426T1/de not_active IP Right Cessation
- 1988-12-13 EP EP88120800A patent/EP0320874B1/fr not_active Expired - Lifetime
- 1988-12-13 ES ES88120800T patent/ES2049242T3/es not_active Expired - Lifetime
- 1988-12-13 DE DE88120800T patent/DE3888122D1/de not_active Expired - Fee Related
- 1988-12-14 YU YU226288A patent/YU47176B/sh unknown
- 1988-12-15 US US07/285,009 patent/US4853508A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0120536A2 (fr) * | 1983-03-23 | 1984-10-03 | Philips Norden AB | Dispositif d'éclairage dans des fours à micro-onde |
DE3606421C1 (de) * | 1986-02-27 | 1987-04-09 | Bosch Siemens Hausgeraete | Beleuchtungseinrichtung fuer einen Mikrowellenherd |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0790755A2 (fr) * | 1996-02-14 | 1997-08-20 | Samsung Electronics Co., Ltd. | Dispositif d'éclairage pour four à micro-ondes |
EP0790755A3 (fr) * | 1996-02-14 | 1998-01-07 | Samsung Electronics Co., Ltd. | Dispositif d'éclairage pour four à micro-ondes |
Also Published As
Publication number | Publication date |
---|---|
ATE102426T1 (de) | 1994-03-15 |
EP0320874A3 (fr) | 1991-03-27 |
YU47176B (sh) | 1995-01-31 |
YU226288A (en) | 1991-04-30 |
EP0320874B1 (fr) | 1994-03-02 |
ES2049242T3 (es) | 1994-04-16 |
US4853508A (en) | 1989-08-01 |
DE3742518A1 (de) | 1989-06-29 |
DE3742518C2 (fr) | 1989-09-28 |
DE3888122D1 (de) | 1994-04-07 |
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