EP0320874A2 - Lighting arrangement for an oven heated by microwaves, especially a domestic cooking oven - Google Patents

Lighting arrangement for an oven heated by microwaves, especially a domestic cooking oven Download PDF

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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
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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
Application number
EP19880120800
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German (de)
French (fr)
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EP0320874A3 (en
EP0320874B1 (en
Inventor
Günter Hammerl
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BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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Priority to AT88120800T priority Critical patent/ATE102426T1/en
Publication of EP0320874A2 publication Critical patent/EP0320874A2/en
Publication of EP0320874A3 publication Critical patent/EP0320874A3/en
Application granted granted Critical
Publication of EP0320874B1 publication Critical patent/EP0320874B1/en
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    • 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.

Abstract

A lighting device for an oven, in particular a household oven, includes a baking chamber with a wall to be exposed to microwave energy, a lamp socket protruding freely into the baking chamber without a microwave shielding covering, electrical connecting lines supplying the lamp socket with current from outside the baking chamber, and an incandescent bulb with a lamp base and an incandescent filament with an incandescent coil being mounted on the lamp socket. An electrically conductive disk is substantially parallel to and electrically conductively connected to the baking chamber wall. The disk has a duct opening formed therein for the lamp base, and the disk surrounds the incandescent filament in the vicinity of the incandescent coil.

Description

Die vorliegende Erfindung bezieht sich auf eine Beleuchtungseinrichtung für ei­nen Ofen, insbesondere für einen Haushalts-Backofen, dessen Garraum mit Mi­krowellenenergie beaufschlagbar ist, unter Verwendung einer Glühlampe, die aufgesetzt auf eine Lampenfassung in den Garraum frei ohne Mikrowellen ab­schirmende Abdeckung hineinragt und von außerhalb des Garraums über elektri­sche Anschlußleitungen mit Strom versorgt wird.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.

Bei Mikrowellenöfen oder Mikrowellenherden mit oder ohne zusätzlichen thermi­schen Heizquellen, dienen zur Ausleuchtung des Garraums üblicherweise Beleuch­tungseinrichtungen mit Glühfadenlampen, die beispielsweise im Bereich einer der Seitenwandungen oder der oberen Wandung des Garraums an der Garraumwand angeordnet sind. In diesem Zusammenhang ist es bekanntermaßen erforderlich, in der Garraumwandung eine relativ große Öffnung vorzusehen, hinter welcher der Lampensockel der Beleuchtungseinrichtung praktisch außerhalb des Ofen­raums befestigt ist. Es sind nunmehr in diesem Bereich besondere Maßnahmen zu treffen, um ein Austreten von Mikrowellen aus dem Garraum durch diese Öffnungen zu verhindern. Darüber hinaus ist auch der Tatsache Rechnung zu tragen, daß die Glühlampen mit ihren Glühfaden und Glühfadenträgern als Emp­fangsantenne für die in den Garraum eingestrahlte Mikrowellenenergie wirken. Die in diesen Lampensystemen induzierte Spannungen erzeugen Ströme, welche unter anderem Stromflüsse nach außen und über die Glühfäden verursachen. Al­lein durch die Beaufschlagung durch diese Ströme können und werden die Glüh­ wendel bekannter Lampenanordnungen, wenn die Lampe frei, d.h. ohne mikrowellen­technische Abschirmung in den Ofenraum hineinragt, zum Glühen gebracht. Späte­stens wenn diese Ströme die für die ordentliche Beleuchtung zugeführten Ströme überlagern, können üblicherweise benutzte Glühlampen wegen Überlastung schnell zerstört werden. Da das elektromagnetische Mikrowellenfeld innerhalb des Garraum nicht zuletzt deswegen, um eine weitgehende gleichmäßige Beaufschlagung des Gar­raums zu erzielen, in diesem wandert, leuchten zumeist die der Mikrowellenenergie ausgesetzten Beleuchtungseinrichtungen der bekannterweise eingesetzten Beleuch­tungseinrichtungen störenderweise intermittierend auf. Aus diesen Gründen ist es allgemein übliche Praxis, Maßnahmen vorzusehen, um eine Einstrahlung der Mikro­wellenenergie auf die Glühlampe der Beleuchtungseinrichtung zu verhindern, zumin­dest aber um diese herabzusetzen. Die gebräuchlichste Schutzmaßnahme besteht dar­in, die Beleuchtungseinrichtung gegenüber dem mit Mikrowellenenergie beaufschlag­baren Raum durch eine sogenannte Lochblende aus elektrisch leitfähigem, mit der Garraumwandung kontaktierendem Material abzuschirmen. Da die Glühlampen insbe­sondere bei Einbaugeräten vom Garraum aus zugänglich und auswechselbar sein soll­ten, muß die Lochblende lösbar an der Garraumwandung befestift werden, was wie­derum Probleme für die Mikrowellenabschirmung verursacht. Besonders nachteilig wirkt sich aber die stark beim Durchgang durch die Lochblende reduzierte Lichtaus­beute aus. Um eine genügende Beleuchtung des Garraums zu erreichen, müssen ent­sprechende leistungsstarke Lampen zum Einsatz gebracht werden, die wiederum ob ihrer starken Wärmeentwicklung zusätzlich Probleme schaffen.In microwave ovens or microwave ovens with or without additional thermal heating sources, lighting devices with filament lamps, which are arranged, for example, in the region of one of the side walls or the upper wall of the cooking chamber on the cooking chamber wall, are used to illuminate the cooking chamber. In this context, it is known that it is necessary to provide a relatively large opening in the cooking chamber wall, behind which the lamp base of the lighting device is fastened practically outside the oven chamber. Special measures must now be taken in this area to prevent microwaves from escaping from the cooking space through these openings. In addition, the fact must be taken into account that the incandescent lamps with their filament and filament carriers act as a receiving antenna for the microwave energy radiated into the cooking space. 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. At the latest when these currents are superimposed on the currents supplied for proper lighting, 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. For these reasons, it is common practice to provide measures to prevent the microwave energy from being radiated onto the incandescent lamp of the lighting device, or at least to reduce it. 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.

Es ist auch schon vorgeschlagen worden, die Glühlampen hinter der Garraumwandung zurückzusetzen und den Aufnahmeschacht für die Glühlampe in Form von soge­nannten Mikrowellenfallen auszugestalten. Auch diese Maßnahme stößt bei prakti­scher Realisierung auf erhebliche Schwierigkeiten. Bei Verwendung von sogenannten Niedervoltlampen, die üblicherweise mit Spannungen unter 30 Volt betrieben werden und die sich dadurch auszeichnen, daß ihre Ausmaße und insbesondere die Ausmaße der Glühlwendel gegenüber Glühlampen für höhere Betriebsspannungen wesentlich kürzer sind, ist die Gefahr der Beeinträchtigung durch Mikrowellenenergie wesentlich herabgesetzt.It has also already been proposed to reset the incandescent lamps behind the cooking space wall and to design the receiving shaft for the incandescent lamp in the form of so-called microwave traps. This measure also encounters considerable difficulties in practical implementation. When using so-called low-voltage lamps, which are usually operated at voltages below 30 volts and which are distinguished by the fact that their dimensions, and in particular the dimensions of the filament, are significantly shorter than incandescent lamps for higher operating voltages, the risk of impairment by microwave energy is significantly reduced.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Beleuchtungseinrichtung bereitzustellen, die aufbautechnisch einfach ist und Auswirkungen der in den Ofen eingestrahlten Mikrowellenenergie auf die Beleuchtungseinrichtung weitestgehend aus­schließt. Dabei soll dem Umstand Rechnung getragen werden, daß sich möglichst im Nahbereich der Beleuchtungseinrichtung, insbesondere der Glühwendel der Lampe keine besonders intensiven Mikrowellenfelder ausbilden und auf die Lampe auswirken können.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.

Eine Beleuchtungseinrichtung, die dieser Vorgabe entspricht, ist erfindungsgemäß da­durch gekennzeichnet, daß im Nahbereich der Glühwendel der Lampe eine elektrisch leitfähige und mit der Garraumwandung elektrisch leitend verbundene, eine Durch­führöffnung für den Lampensockel aufweisende Scheibe im wesentlichen parallel zur Garraumwandung ausgerichtet, den Glühfaden umgebend angeordnet ist.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 .

Durch die Anwendung dieser erfindungsgemäßen Maßnahme wird das Erdungspotential der Gehäusewandung für den Bereich der Beleuchtungseinrichtung in eine Ebene im Glühfadenbereich oder nahe diesem Glühfadenbereich partiell gebracht, so daß die­sem Bereich sich keine intensiven Mikrowellenfelder ausbilden können, die pro­blematische Auswirkungen auf den Glühfaden haben könnten. Besonders vorteilhaft ist diese Maßnahme im Zusammenhang mit der Verwendung von Niedervoltlampen, insbesondere von Halogenstrahlern für die Beleuchtung des Ofenraums, da derartige Lampen besonders kleine Abmessungen sowohl der Glühwendel aber auch des diese umgebenden Glaskolbens aufweisen. Somit kann die Durchführöffnung der elektrisch leitfähigen und mit der Garraumwandung elektrisch leitend verbundenen Scheibe für die Lampe entsprechend klein sein, so daß über diese Scheibe das Erdpotential der Gehäusewandung tatsächlich sehr nahe in den Bereich der Glühwendel der Lampe herangeführt wird.By applying this measure according to the invention, 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. Thus, 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.

Nach einer bevorzugten Ausgestaltung ist die erfindungsgemäße Beleuchtungseinrich­tung dadurch gekennzeichnet, daß die aus elektrisch leitendem Material bestehende Scheibe gegenüber der in den Ofenraum hineinragenden Glühfaden der Glühlampe zu­rückversetzt angeordnet ist. Die Schutzwirkung für die Glühwendel der Lampe bleibt in diesem Fall praktisch aufrecht erhalten, es wird durch die Maßnahme je­doch erreicht, daß die Lichtausbeute für den Garraum verbessert wird, und zwar insbesondere zusätzlich auch dann, wenn die in den Garraum hineinweisende Oberflä­che dieser metallischen Scheibe lichtreflektierend ausgebildet ist.According to a preferred embodiment, 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.

Nach einer anderen bevorzugten Ausgestaltung ist die erfindungsgemäße Beleuch­tungseinrichtung dadurch gekennzeichnet, daß der Abstand zwischen der aus elek­trisch leitendem Material bestehenden Scheibe und den spannungsführenden Kontakt­teilen in der Lampenfassung der Beleuchtungseinrichtung größer ist als die Länge der metallischen Kontaktierungselemente im Lampensockelbereich. Damit dient die aus elektrisch leitendem Material bestehende und über die elektrische Verbindung zur Gerätewandung schutzgeerdete Scheibe auch als Berührungsschutz für Bedie­nungspersonen, so daß eine Berührung von spannungsführenden Teilen oder fehlerhaft mit Spannung beaufschlagten Teilen insbesondere beim Auswechseln der Lampen vor­gebeugt ist.According to another preferred embodiment, 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. Thus, 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.

Nach den Merkmalen der Erfindung ausgestattete Ausführungsbeispiele sind anhand der Zeichnungen im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 in schematisierter Ansicht eine an einer Garraumwandung angeordnete und in den Garraum hineinragende Beleuchtungseinrichtung für einen mit Mikrowellenenergie beaufschlagbaren Haushalts-Backofen und
  • Fig. 2 eine Schnittansicht einer insgesamt in einen Haushalts-Backofen einsetz­baren Backofenleuchte.
Exemplary embodiments equipped according to the features of the invention are described in more detail below with reference to the drawings. Show it:
  • Fig. 1 shows a schematic view of a lighting device arranged on a cooking space wall and projecting into the cooking space for a household oven and which can be acted upon with microwave energy
  • Fig. 2 is a sectional view of an oven light which can be used overall in a domestic oven.

Gemäß Figur 1 ist von einem Haushalts-Backofen mit einem mit Mikrowellenenergie beaufschlagbaren Garraum 1, der durch Garraumwandungen und eine Garraumtür all­seitig umgeben ist, lediglich der die Beleuchtungseinrichtung für den Garraum ent­haltende Bereich eines Teilabschnitts 2 einer im Schnitt gezeichneten Garraumwan­dung dargestellt. Auf diesem Teilabschnitt 2 der Garraumwandung ist ein Lampen­träger 3 aus elektrisch isolierendem Material befestigt. Von den Steckbuchsen 4 dieses Lampenträgers sind Anschlußleitungen 5 zu einer Stromversorgungs-Einrich­tung, einem nicht dargestellten Transformator geführt. Diese durch die Durchfüh­rungsöffnungen 6 durch die Garraumwandung 2 hindurchragenden, isolationsummantel­ten Anschlußleitungen 5 tragen im Bereich dieser Durchführungsöffnungen 6 und daran anschließend einen metallischen Abschirmmantel 7, welcher sich auch zwischen dem Lampenträger 3 und der Garraumwandung 2 erstreckt. Dadurch wird eine rele­vante Abstrahlung von Mikrowellenenergie aus dem Garraum 1 durch die Durchfüh­ rungslöcher 6 sicher verhindert und die erforderliche Mikrowellendichtheit in diesem Bereich somit gewährleistet.According to 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. These through the through openings 6 through the cooking chamber wall 2, 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.

In die Steckbuchsen 4 des Lampenträgers 3 sind Anschluß-Steckstifte 10 einer Halo­genlampe 11 eingesteckt. Diese Anschlußstifte 10 sind durch den Glassockel 12 der Halogenlampe 11 als im wesentlichen parallel zueinander verlaufende Glühfadenträger 13 weitergeführt. Zwischen den freien Enden der Glühfadenträger 13 innerhalb des Glaskolbens der Halogenlampe 11 ist ein gewendelter Glühfaden 14 gespannt. Die Halogenlampe 11 und der Lampenträger 3 sind durch eine Glashaube 15 gegenüber dem Garraum 1 abgedeckt, damit ein Schutz gegen ungewolltes Berühren, gegen Be­schädigung und gegen unmittelbares Verschmutzen der Halogenlampe 11 gegeben ist.In the sockets 4 of the lamp holder 3, 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.

Parallel zur Garraumwandung 2 ist im Bereich nahe des Glühfadens 14 ein aus elek­trisch leitendem Material bestehendes Schild 16, welches über metallische Säulen 17 mechanisch und elektrisch mit der Garraumwandung 2 verbunden ist, innerhalb der Glashaube 15 angeordnet. Dieses Schild 16 hebt das Massepotential der Garraum­wandung 2 in eine Ebene nahe des Glühfadens 14 der Lampe 11, so daß sich in die­sem Bereich kein für die Beeinträchtigung der Glühwendel relevantes Mikrowel­lenfeld aufbauen kann. Eine Durchführungsöffnung 18 im aus elektrisch leitfähigem Material bestehenden Schild 16 ist derart ausgestaltet, daß der Glaskolben der Lam­pe 11 gerade problemlos durch dieses Schild 16 gesteckt werden und ragen kann.Parallel to the cooking space wall 2, in the area near the filament 14, 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.

Gemäß Figur 2 ist in einem napfartigen, einseitig offenen Lampengehäuse 21 eine aus elektrisch isolierendem Material, z.B. Keramik bestehende Lampenfassung 22 be­festigt. In diese Lampenfassung 22 ist eine Lampe 23, zweckmäßigerweise eine Nie­derspannungslampe eingesteckt. Innerhalb des üblicherweise zylindrischen Lampenkol­bens 24 der Lampe 23 ist der Glühlampenfaden 25 angeordnet, welche über Glühfa­denträger 26 zu Kontaktstiften 27 aus dem Glassockel herausgeführt sind. Dieser Glassockel der Lampe 23 ist durch eine an die Lampenfassung 22 angeformte rohr­artige Verlängerung 28 umgeben. Auf einen Flansch des Lampengehäuses 21 ist eine linsenförmige, transparente Glasabdeckung 29 aufgeschraubt, welche zum Einsetzen bzw. Auswechseln der Lampe 23 abschraubbar ist. Innerhalb dieser Glasabdeckung ist im Bereich des Glühlampenfadens 25 - ähnlich wie bei der Anordnung gemäß Figur 1 - ein aus elektrisch leitfähigem Material bestehendes Schild 30 angeordnet, wel­ ches über Säulen 31 mit dem Lampengehäuse 21 mechanisch und elektrisch leitend verbunden ist, so daß das Gehäusepotential in den Bereich des Glühlampenfadens 25 gehoben ist.According to FIG. 2, a lamp holder 22 made of electrically insulating material, for example ceramic, is fastened in a cup-like lamp housing 21 which is open on one side. A lamp 23, expediently a low-voltage lamp, is inserted into this lamp holder 22. Arranged within the usually cylindrical lamp bulb 24 of the lamp 23 is the incandescent lamp filament 25, which are led out of the glass base via filament carrier 26 to contact 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. Within this glass cover, in the area of the incandescent lamp filament 25 - similar to the arrangement according to FIG ches is mechanically and electrically conductively connected to the lamp housing 21 via columns 31, so that the housing potential is raised in the region of the filament 25.

Der Abstand es Schildes 16 bzw. 30 zu den Kontaktelementen 4 bzw. 32 des Lam­pensockels 3 bzw. 22 ist größer gewählt als die Länge der Anschlußstifte 10 bzw. 27 der Lampe 11 bzw. 23, um zu erreichen, daß zwischen den berührbaren und/oder elektrisch leitfähigen Materialien ein zumindest den Vorschriften entsprechender Ab­stand bezüglich elektrischen Überschlägen bei Überspannungen und Kriechstrecken gegeben ist.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.

Claims (4)

1. Beleuchtungseinrichtung für eine Ofen, insbesondere für einen Haushalts-Backo­fen, dessen Garraum mit Mikrowellenenergie beaufschlagbar ist, unter Verwen­dung einer Glühlampe, die aufgsetzt auf eine Lampenfassung in den Garraum frei ohne Mikrowellen abschirmende Abdeckung hineinragt und von außerhalb des Garraums über elektrische Anschlußleitungen mit Strom versorgt wird, da­durch gekennzeichnet, daß im Nahbereich der Glühwendel der Lampe eine elektrisch leitfähige und mit der Garraumwandung elektrisch leitend verbundene, eine Durchführöffnung für den Lampensockel aufweisende Scheibe im wesentlichen parallel zur Garraumwandung ausgerichtet, den Glühfaden um­gebend angeordnet ist.1.Lighting device for an oven, in particular for a domestic oven, the cooking space of which can be acted upon by 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 via electrical connecting lines with current is supplied, characterized in that in the vicinity of the incandescent filament of the lamp an electrically conductive and electrically conductively connected to the cooking space wall, having a through opening for the lamp base disc aligned substantially parallel to the cooking space wall, the filament is arranged surrounding. 2. Beleuchtungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die aus elektrisch leitendem Material bestehende Scheibe gegenüber der in den Ofen­raum hineinragende Glühfaden der Glühlampe zurückversetzt angeordnet ist.2. Lighting device according to claim 1, characterized in that the disc made of electrically conductive material is arranged set back relative to the filament of the incandescent lamp protruding into the furnace space. 3. Beleuchtungseinrichtung nach einem der Ansprüche 1 oder 2, dadurch gekenn­zeichnet, daß die in den Garraum hineinweisende Oberfläche dieser metallischen Schiebe lichtreflektierend ausgebildet ist.3. Lighting device according to one of claims 1 or 2, characterized in that the surface of this metallic slide pointing into the cooking space is designed to be light-reflecting. 4. Beleuchtungseinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeich­net, daß der Abstand zwischen der aus elektrisch leitendem Material bestehen­den Scheibe und den spannungsführenden Kontaktteilen in der Lampenfassung der Beleuchtungseinrichtung größer ist als die Länge der metallischen Kontak­tierelemente im Lampensockelbereich.4. Lighting device according to one of claims 1 to 3, characterized in that the distance between the disc made of electrically conductive material and the live contact parts in the lamp socket of the lighting device is greater than the length of the metallic contact elements in the lamp base area.
EP88120800A 1987-12-15 1988-12-13 Lighting arrangement for an oven heated by microwaves, especially a domestic cooking oven Expired - Lifetime EP0320874B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88120800T ATE102426T1 (en) 1987-12-15 1988-12-13 LIGHTING DEVICE FOR A MICROWAVE OVEN, ESPECIALLY A DOMESTIC OVEN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873742518 DE3742518A1 (en) 1987-12-15 1987-12-15 LIGHTING DEVICE FOR A STOVE WITH MICROWAVE ENERGY, ESPECIALLY A HOUSEHOLD OVEN
DE3742518 1987-12-15

Publications (3)

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

Family

ID=6342666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120800A Expired - Lifetime EP0320874B1 (en) 1987-12-15 1988-12-13 Lighting arrangement for an oven heated by microwaves, especially a domestic cooking oven

Country Status (6)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790755A2 (en) * 1996-02-14 1997-08-20 Samsung Electronics Co., Ltd. Lighting device for microwave oven

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464383B (en) * 1989-07-18 1991-04-15 Whirlpool Int MICROWAVE OVEN WITH A LIGHTING DEVICE FOR INFORMATION OF YOUNG CAVITY
DE4003736A1 (en) * 1990-02-08 1991-08-14 Miele & Cie Microwave oven lighting with truncated conical reflector housing - gives widely scattered distribution of light from filament lamp through transparent screen into irradiated cooking space
DE4304522A1 (en) * 1993-02-15 1994-08-18 Bosch Siemens Hausgeraete Luminaire for microwave oven
DE4304523A1 (en) * 1993-02-15 1994-08-18 Bosch Siemens Hausgeraete Luminaire for ovens
DE4421336C2 (en) * 1994-06-17 2002-09-26 Miele & Cie Lighting device in a microwave oven
US6361181B1 (en) 2000-02-28 2002-03-26 Maytag Corporation Appliance with light mounted in door
KR100468123B1 (en) * 2002-06-29 2005-01-26 삼성전자주식회사 Wall mounting type microwave oven
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120536A2 (en) * 1983-03-23 1984-10-03 Philips Norden AB Illuminating arrangement in microwave ovens
DE3606421C1 (en) * 1986-02-27 1987-04-09 Bosch Siemens Hausgeraete Lighting device for a microwave oven

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7831659U1 (en) * 1978-10-24 1980-04-10 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart MICROWAVE OVEN
DE2921425C3 (en) * 1979-05-26 1985-10-10 Pistor + Boss GmbH, 5880 Lüdenscheid Electric lamp for illuminating ovens
US4621180A (en) * 1985-07-08 1986-11-04 Whirlpool Corporation Cavity illumination means for microwave oven
DE3641420A1 (en) * 1986-12-04 1988-06-09 Licentia Gmbh Microwave cooker
US4763638A (en) * 1987-05-14 1988-08-16 Raytheon Company Gas self-clean double wall oven

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120536A2 (en) * 1983-03-23 1984-10-03 Philips Norden AB Illuminating arrangement in microwave ovens
DE3606421C1 (en) * 1986-02-27 1987-04-09 Bosch Siemens Hausgeraete Lighting device for a microwave oven

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790755A2 (en) * 1996-02-14 1997-08-20 Samsung Electronics Co., Ltd. Lighting device for microwave oven
EP0790755A3 (en) * 1996-02-14 1998-01-07 Samsung Electronics Co., Ltd. Lighting device for microwave oven

Also Published As

Publication number Publication date
DE3742518A1 (en) 1989-06-29
ATE102426T1 (en) 1994-03-15
YU226288A (en) 1991-04-30
EP0320874A3 (en) 1991-03-27
US4853508A (en) 1989-08-01
EP0320874B1 (en) 1994-03-02
DE3742518C2 (en) 1989-09-28
YU47176B (en) 1995-01-31
DE3888122D1 (en) 1994-04-07
ES2049242T3 (en) 1994-04-16

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