EP0320874B1 - 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
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
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EP
European Patent Office
Prior art keywords
lamp
cooking space
oven
incandescent
filament
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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
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EP88120800A
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German (de)
French (fr)
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EP0320874A3 (en
EP0320874A2 (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
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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 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)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Drying Of Solid Materials (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

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 einen Lampenträger 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 of the Cooking space is supplied with electricity via electrical connection lines.

Bei Mikrowellenöfen oder Mikrowellenherden mit oder ohne zusätzliche thermische 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 induzierten Spannungen erzeugen Ströme, welche unter anderem Stromflüsse nach außen und über die Glühfäden verursachen. Allein durch die Beaufschlagung durch diese Ströme kann und wird die Glühwendel 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 Garraums, 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 befestigt 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. There are now special measures in this area to prevent microwaves from escaping from the oven through these openings. In addition, account must also be taken of the fact 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 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. At the latest when these currents are superimposed on the currents supplied for the 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 illuminate 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 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.

Es ist auch schon vorgeschlagen worden, die Glühlampen hinter der Garraumwandung zurückzusetzen und den Aufnahmeschacht für die Glühlampe in Form von sogenannten Mikrowellenfallen auszugestalten wie in der DE-C-3 606 421, die zur Abgrenzung des Oberbegriffs des Anspruchs 1 herangezogen wurde, beispielsweise dargestellt. Dort ist konzentrisch zu einer äußeren, außerhalb des Mikrowellen garraums an dessen Wandung anschließenden, Hülse des Lampengehäuses eine innere Hülse um die Lampe angeordnet. 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 Außmaße der Glühwendel gegenüber Glühlampen für höhere Betriebsspannungen wesentlich kürzer sind, ist die Gefahr der Beeinträchtigung durch Mikrowellenenergie wesentlich herabgesetzt.It has also been proposed to reset the incandescent lamps behind the cooking chamber wall and to design the receiving shaft for the incandescent lamp in the form of so-called microwave traps, as shown in DE-C-3 606 421, which was used to delimit the preamble of claim 1, for example. There, an inner sleeve is arranged around the lamp concentrically with an outer sleeve of the lamp housing, which adjoins the wall outside the microwave. This measure also encounters considerable difficulties in practical implementation. When using so-called low-voltage lamps, which are usually operated with voltages below 30 volts and which are distinguished by the fact that their dimensions and in particular the dimensions of the incandescent 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 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.

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 ist.According to the invention, 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.

Durch die Anwendung dieser erfindungsgemäßen Maßnahme wird das Erdungspotential der Gehäusewandung für den Bereich der Beleuchtungseinrichtung in eine Ebene im Glühwendelbereich oder nahe diesem Glühwendelbereich partiell gebracht, so daß sich in diesem Bereich keine intensiven Mikrowellenfelder ausbilden können, die problematische Auswirkungen auf die Glühwendel 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 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. 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 Glühwendel 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 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.

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 im Lampenträger der Beleuchtungsreinrichtung größer ist als die Länge der metallischen Anschlußstifte im Lampensockelbereich. Damit dient die aus elektrisch leitendem Material bestehende und über die elektrische Verbindung zur Gerätewandung schutzgeerdete Scheibe auch als Berührungsschutz für die Bedienungsperson, so daß einer 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 connection pins 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 the operator, so that contact with live parts or incorrectly charged parts, in particular when replacing the lamps, is prevented.

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

Fig. 1
in schematisierter Ansicht eine an eine 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
in a schematic view of a lighting device arranged on a cooking space wall and protruding into the cooking space for a household oven and which can be acted upon with microwave energy
Fig. 2
a sectional view of an oven light usable overall in a household 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 3 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 Durchführungslöcher 6 sicher verhindert und die erforderliche Mikrowellendichtheit in diesem Bereich somit gewährleistet.According to FIG. 1, only 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. These through the through openings 6 through the cooking space wall 2, 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.

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 (Glühwendel) 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 (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.

Parallel zur Garraumwandung 2 ist im Bereich nahe der Glühwendel 14 eine aus elektrisch leitendem Material bestehende Scheibe 16, welche über metallische Säulen 17 mechanisch und elektrisch mit der Garraumwandung 2 verbunden ist, innerhalb der Glashaube 15 angeordnet. Diese Scheibe 16 hebt das Massepotential der Garraumwandung 2 in eine Ebene nahe der Glühwendel 14 der Lampe 11, so daß sich in diesem Bereich kein für die Beeinträchtigung der Glühwendel relevantes Mikrowellenfeld aufbauen kann. Eine Durchführungsöffnung 18 in der aus elektrisch leitfähigem Material bestehenden Scheibe 16 ist derart ausgestaltet, daß der Glaskolben der Lampe 11 gerade problemlos durch diese Scheibe 16 gesteckt werden und ragen kann.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.

Gemäß Figur 2 ist in einem napfartigen, einseitig offenen Lampengehäuse 21 eine aus elektrisch isolierendem Material, z.B. Keramik bestehende Lampenfassung (Lampenträger) 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 (Glühwendel) 25 angeordnet, welcher über Glühfadenträger 26 zu Anschlußstiften 27 aus dem Glassockel herausgeführt ist. Dieser Glassockel der Lampe 23 ist durch eine an die Lampenfassung 22 angeformte rohrartige Verlängerung 28 umgeben. Auf einen Flansch des Lampengehäues 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 - eine aus elektrisch leitfähigem Material bestehende Scheibe 30 angeordnet, welche 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 (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. 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. Within this glass cover, in the area of the incandescent filament 25 - similar to the arrangement according to FIG. 1 - 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.

Der Abstand der Scheibe 16 bzw. 30 zu den Steckbuchsen 4 bzw. 32 des Lampenträgers 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 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.

Claims (4)

  1. Illuminating equipment for an oven, in particular for a domestic baking oven, the cooking space (1) of which can be acted on by microwave energy, with the use of an incandescent lamp (11, 23), which placed on a lamp carrier (3, 22) projects freely into the cooking space (1) without a cover screening against microwaves and is supplied with current by way of electrical connecting lines (5, 33) from outside the cooking space (1), characterised thereby, that an electrically conductive disc (16; 30), which is electrically conductively connected with the cooking space wall and displays a feedthrough opening (18) for the lamp holder (12; 22) is oriented substantially parallelly to the cooking space wall in the proximity of the filament coils (14; 25) of the lamp.
  2. Illuminating equipment according to claim 1, characterised thereby, that the disc (16; 30) consisting of electrically conductive material is arranged set back relative to the filament coils (14; 25), which project into the cooking space (1), of the incandescent lamp (11, 23).
  3. Illuminating equipment according to one of the claims 1 and 2, characterised thereby, that the surface, which points into the cooking space (1), of this metallic disc (16; 30) is formed to be light-reflecting.
  4. Illuminating equipment according to one of the claims 1 to 3, characterised thereby, that the spacing between the disc (16; 30) consisting of electrically conductive material and the voltage-carrying plug sockets (4; 32) in the lamp carrier (3; 22) of the illuminating equipment is greater than the length of the metallic connecting pins (10; 27) in the lamp holder (12; 22).
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 EP0320874A2 (en) 1989-06-21
EP0320874A3 EP0320874A3 (en) 1991-03-27
EP0320874B1 true 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)

Families Citing this family (11)

* 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
DE4304523A1 (en) * 1993-02-15 1994-08-18 Bosch Siemens Hausgeraete Luminaire for ovens
DE4345353C2 (en) * 1993-02-15 2002-08-14 Bsh Bosch Siemens Hausgeraete Light in a microwave oven
DE4421336C2 (en) * 1994-06-17 2002-09-26 Miele & Cie Lighting device in a microwave oven
KR970062507A (en) * 1996-02-14 1997-09-12 김광호 Lighting equipment for microwave ovens
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

Family Cites Families (7)

* 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
SE444061B (en) * 1983-03-23 1986-03-17 Philips Norden Ab MICROWAG OVEN LIGHTING DEVICE
US4621180A (en) * 1985-07-08 1986-11-04 Whirlpool Corporation Cavity illumination means for microwave oven
DE3606421C1 (en) * 1986-02-27 1987-04-09 Bosch Siemens Hausgeraete Lighting device for a 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

Also Published As

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

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