EP0284958B1 - Device for coupling a micro-wave field to a micro-wave oven - Google Patents
Device for coupling a micro-wave field to a micro-wave oven Download PDFInfo
- Publication number
- EP0284958B1 EP0284958B1 EP19880104551 EP88104551A EP0284958B1 EP 0284958 B1 EP0284958 B1 EP 0284958B1 EP 19880104551 EP19880104551 EP 19880104551 EP 88104551 A EP88104551 A EP 88104551A EP 0284958 B1 EP0284958 B1 EP 0284958B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupling
- waveguide
- field
- microwave
- resonance chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/72—Radiators or antennas
-
- 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
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/04—Heating using microwaves
- H05B2206/044—Microwave heating devices provided with two or more magnetrons or microwave sources of other kind
Definitions
- the invention relates to a device for coupling a microwave field into a microwave oven, in which the microwave field generated by at least one microwave transmitter reaches the cooking chamber of the oven via at least one waveguide, and in which a metallically closed resonator room is provided between the cooking chamber and the waveguide. to which the waveguide is connected and which is connected to the cooking space via coupling openings.
- a device for coupling a microwave field into a microwave oven, in which the microwave field generated by at least one microwave transmitter reaches the cooking chamber of the oven via at least one waveguide, and in which a metallically closed resonator room is provided between the cooking chamber and the waveguide. to which the waveguide is connected and which is connected to the cooking space via coupling openings.
- Such a device is known from publication DE-A-3028009. With such devices, the transition from the waveguide into the cooking chamber is particularly important. This transition largely determines the optimal field distribution in the cooking space. The aim here is to ensure that exactly the same heating takes place at every point in the cooking space.
- a field distributor (propeller or rotating antenna), which is also installed, ensures that the entire microwave field is in motion, ie that it is forced due to the physical spread of the microwave in the cooking space, the hot and cold points that arise are shifted against each other and the heating is equally strong at every point.
- Solutions are also known in which a box is built onto the cooking space, which is separated from the cooking space by a ceramic cover, possibly by a glass or plastic cover.
- the waveguide is in each case blocked from the front of the box and the field distributor is usually mounted in this box, which is part of the cooking space with regard to the microwave field.
- This object is achieved in that stationary coupling elements are arranged in the resonator space in order to also couple the voltage vector from the coupling direction (E z ) into the other two dimensions (E x , E y ).
- the desired isotropic field distribution can thus be achieved even in the resonator space itself.
- the resonator space is preferably separated from the cooking space by a metallic partition wall which has coupling openings whose dimensions are smaller than those of the partition wall and which are shaped such that the resulting voltage vectors of the microwave field are evenly coupled into the cooking space.
- a movable field distributor is also advantageously arranged in the closed resonator chamber.
- the intended resonator space decouples the cooking space from the microwave transmitter, which thus remains unaffected by the respective load in the cooking space and can thus be operated with optimum efficiency, with a uniform alignment of the resulting voltage vectors of the microwave field and thus uniform heating being achieved in the cooking space.
- the microwave transmitter 1 shows a microwave transmitter 1 with a magnetron 4 which projects into a rectangular waveguide 2.
- the magnetron 4 generates a microwave field in a known manner, which is fed via the waveguide 2 to a cooking chamber 3, which is designed to receive the food.
- the rectangular waveguide 2 is dimensioned such that the resulting voltage vector E z of the microwave field in the waveguide is perpendicular to its broad side, as indicated in FIG. 2.
- a thin, long, electrically poorly conductive rod held parallel to the above voltage vector in the waveguide, it absorbs energy, i.e. he warms up. If it is held perpendicular to the voltage vector in the waveguide, it does not absorb any energy because the extension of the rod in the direction of the voltage vector is too small.
- the cooking space 3 forms a cavity in which, in conventional arrangements, a voltage vector prevails in the direction in which it is coupled in.
- the waveguide 2 is connected to a resonator chamber 5 which is box-shaped. This is metallically sealed and connected to the cooking space 3 by coupling openings 6.
- the coupling openings are arranged in a partition 8, which is common to the resonator chamber 5 and the cooking chamber 3.
- the coupling openings 6, which are smaller in their dimensions than the partition 8, serve to effect the alignment of the microwave field in several directions. This can be done in several ways.
- the slot-shaped design of the coupling openings 6 causes voltage vectors E x and E y to be coupled in, which are each perpendicular to the slot extension.
- the coupling openings 6 can also have other shapes (round, square) and e.g. be arranged transversely in space 5 in order to influence the field in such a way that the most uniform possible distribution of microwave energy in all three dimensions is achieved in cooking space 3.
- each coupling pin 9 is fastened to the edges of the upper cover surface of the resonator chamber 5 and project into the resonator chamber in the manner shown.
- a movable field distributor 7 (propeller or rotary antenna) is arranged in the resonator chamber 5.
- the multi-dimensionally distributed microwave field configured in the manner described is additionally moved in this way.
- the field distributor 7 can also be arranged in the cooking space 3 itself.
- FIG. 4 shows an appropriately designed coupling device, in which two transmitters 1.
- the remaining parts, such as coupling elements and field distributors, are not shown in the drawing for the sake of simplicity.
- the coupling resonator described can optionally be attached to the top or base surface of the cooking space or to one of its side surfaces.
- the waveguide 2 opens in each case on one side 10 of the box-shaped resonator chamber 5, which abuts the partition 8 to the cooking chamber.
- a coupling system is described with which, in addition to the better decoupling of the transmitter and the cooking space, there are also various possibilities for aligning the microwave field in all three dimensions before and during the coupling into the cooking space.
- the field distributor also moves the microwave field in all three dimensions. This results in optimal heat distribution in the cooking space.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
Description
Die Erfindung bezieht sich auf eine Vorrichtung zur Einkoppelung eines Mikrowellenfeldes in einen Mikrowellenherd, bei welcher das von mindestens einem Mikrowellensender erzeugte Mikrowellenfeld über mindestens einen Hohlleiter zum Garraum des Herds gelangt, und bei welcher zwischen dem Garraum und dem Hohlleiter ein metallisch geschlossener Resonatorraum vorgesehen ist, an den der Hohlleiter angeschlossen ist und der über Koppelöffnungen mit dem Garraum verbunden ist. Eine solche Vorrichtung ist aus der Publikation DE-A-3028009 bekannt. Wichtig ist bei solchen Vorrichtungen insbesondere der Uebergang vom Hohlleiter in den Garraum. Dieser Uebergang bestimmt weitgehend die optimale Feldverteilung im Garraum. Dabei möchte man möglichst erreichen, dass im Garraum an jedem Punkt genau dieselbe Erwärmung stattfindet. Diese Ankopplung des Garraumes geschieht bekannterweise mittels Durchbrüchen zwischen Resonatorraum und Garraum. Ein Feldverteiler (Propeller oder Drehantenne), der zusätzlich eingebaut ist, sorgt dafür, dass das ganze Mikrowellenfeld in Bewegung ist, d.h. dass die zwangsmässig durch die physikalische Ausbreitung der Mikrowelle im Garraum entstehenden heissen und kalten Punkte gegeneinander verschoben werden und somit an jeder Stelle gleich starke Erwärmung stattfindet.The invention relates to a device for coupling a microwave field into a microwave oven, in which the microwave field generated by at least one microwave transmitter reaches the cooking chamber of the oven via at least one waveguide, and in which a metallically closed resonator room is provided between the cooking chamber and the waveguide. to which the waveguide is connected and which is connected to the cooking space via coupling openings. Such a device is known from publication DE-A-3028009. With such devices, the transition from the waveguide into the cooking chamber is particularly important. This transition largely determines the optimal field distribution in the cooking space. The aim here is to ensure that exactly the same heating takes place at every point in the cooking space. This coupling of the cooking chamber is known to be done by means of openings between the resonator chamber and the cooking chamber. A field distributor (propeller or rotating antenna), which is also installed, ensures that the entire microwave field is in motion, ie that it is forced due to the physical spread of the microwave in the cooking space, the hot and cold points that arise are shifted against each other and the heating is equally strong at every point.
Bekannt sind auch Einrichtungen, bei welchen der Hohlleiter frontal direkt an den Garraum angeschlossen ist. Somit geschieht die Einkopplung direkt vom Hohlleiter in den Garraum. Die ganze Feldverteilung im Garraum kann dann nur durch den Feldverteiler optimiert werden.Devices are also known in which the waveguide is connected frontally directly to the cooking space. Thus the coupling takes place directly from the waveguide into the cooking space. The entire field distribution in the cooking space can then only be optimized by the field distributor.
Es sind ferner Lösungen bekannt, bei denen eine Kiste auf den Garraum aufgebaut ist, die durch eine Keramikabdeckung, eventuell durch eine Glas- oder Plastikabdeckung, vom Garraum getrennt ist. Der Hohlleiter ist jeweils frontal an die Kiste angeblockt und der Feldverteiler ist üblicherweise in dieser Kiste angebracht, welche im Hinblick auf das Mikrowellenfeld ein Teil des Garraums darstellt.Solutions are also known in which a box is built onto the cooking space, which is separated from the cooking space by a ceramic cover, possibly by a glass or plastic cover. The waveguide is in each case blocked from the front of the box and the field distributor is usually mounted in this box, which is part of the cooking space with regard to the microwave field.
Bei all diesen Lösungen besteht neben dem Problem der schlechten Entkopplung des Senders vom Garraum das Problem, dass der resultierende Spannungsvektor des Mikrowellenfeldes ausgehend von der Vektorrichtung im Hohlleiter gewisse Vorzugsrichtungen besitzt. Die erwähnten Feldverteler bewirken zwar in beschränktem Mass, dass sich dieser Spannungsvektor auch in die andern beiden Dimensionen ausbreitet. Dies ist jedoch oft ungenügend, indem weiterhin der Spannungsvektor in der eingekoppelten Richtung überwiegt, womit die Erwärmung nicht optimal erfolgt.In all of these solutions, in addition to the problem of poor decoupling of the transmitter from the cooking space, there is the problem that the resulting voltage vector of the microwave field has certain preferred directions based on the vector direction in the waveguide. The field switches mentioned have a limited effect in that this voltage vector also spreads in the other two dimensions. However, this is often insufficient in that the voltage vector continues to predominate in the coupled direction, so that the heating does not take place optimally.
Es stellt sich damit die Aufgabe, die eingangs erwähnte Einkopplungsvorrichtung so auszugestalten, dass einerseits die Entkopplung von Sender und Garraum. verbessert wird und gleichzeitig im Garraum keine bevorzugten Feldrichtungen auftreten.It is therefore the task of designing the coupling device mentioned at the outset in such a way that on the one hand, the decoupling of the transmitter and the cooking space. is improved and at the same time no preferred field directions occur in the cooking space.
Diese Aufgabe wird dadurch gelöst, dass im Resonatorraum stationäre Kopplungsgelmente angeordnet sind, um den Spannungsvektor aus der Einkoppelrichtung (Ez) auch in die zwei übrigen Dimensionen (Ex, Ey) zu koppeln.
Damit kann bereits im Resonatorraum selbst die gewünschte, isotrope Feldverteilung erzielt werden.This object is achieved in that stationary coupling elements are arranged in the resonator space in order to also couple the voltage vector from the coupling direction (E z ) into the other two dimensions (E x , E y ).
The desired isotropic field distribution can thus be achieved even in the resonator space itself.
Vorzugsweise ist der Resonatoraum durch eine metallische Trennwand vom Garraum getrennt, welche Einkopplungsöffnungen aufweist, deren Abmessungen kleiner sind, als diejenigen der Trennwand und die derart geformt sind, dass die resultierenden Spannungsvektoren des Mikrowellenfeldes gleichmässig in den Garraum eingekoppelt werden.The resonator space is preferably separated from the cooking space by a metallic partition wall which has coupling openings whose dimensions are smaller than those of the partition wall and which are shaped such that the resulting voltage vectors of the microwave field are evenly coupled into the cooking space.
Um das Mikrowellenfeld im Garraum zu bewegen, ist zusätzlich mit Vorteil ein beweglicher Feldverteiler im geschlossenen Resonatorraum angeordnet.In order to move the microwave field in the cooking chamber, a movable field distributor is also advantageously arranged in the closed resonator chamber.
Der vorgesehene Resonatorraum entkoppelt den Garraum vom Mikrowellensender, welcher damit von der jeweiligen Last im Garraum unbeeinflusst bleibt und damit bei optimalem Wirkungsgrad betrieben werden kann, wobei im Garraum eine gleichmässige Ausrichtung der resultierenden Spannungsvektoren des Mikrowellenfelds und damit eine gleichmässige Erwärmung erzielt wird.The intended resonator space decouples the cooking space from the microwave transmitter, which thus remains unaffected by the respective load in the cooking space and can thus be operated with optimum efficiency, with a uniform alignment of the resulting voltage vectors of the microwave field and thus uniform heating being achieved in the cooking space.
Nachfolgend wird anhand der beiliegenden Ausführungsbeispiele die Erfindung näher beschrieben. Es zeigen:
- Fig. 1
- eine perspektivische Gesamtansicht einer ersten Ausführung der Vorrichtung, wobei die Kopplungselemente darin nicht eingezeichnet sind,
- Fig. 2
- eine schematische Darstellung der Ausrichtung des Spannungsvektors im Hohlleiter;
- Fig. 3
- eine Detailansicht des Resonatorraums mit den Kopplungselementen, und
- Fig. 4
- eine perspektivische Ansicht einer Ausführung mit zwei Sendern, wobei die Kopplungselemente ebenfalls nicht eingezeichnet sind.
- Fig. 1
- an overall perspective view of a first Implementation of the device, the coupling elements not being shown therein,
- Fig. 2
- a schematic representation of the orientation of the voltage vector in the waveguide;
- Fig. 3
- a detailed view of the resonator with the coupling elements, and
- Fig. 4
- a perspective view of an embodiment with two transmitters, the coupling elements are also not shown.
In Fig. 1 ist ein Mikrowellensender 1 mit einem Magnetron 4 ersichtlich, das in einen Rechteck-Hohlleiter 2 hineinragt. Das Magnetron 4 erzeugt in bekannter Weise ein Mikrowellenfeld, das über den Hohlleiter 2 einem Garraum 3 zugeführt wird, der zur Aufnahme des Kochguts ausgestaltet ist. Der Rechteckhohlleiter 2 ist so dimensioniert, dass der resultierende Spannungsvektor Ez des Mikrowellenfelds im Hohlleiter senkrecht zu dessen Breitseite steht, wie in Fig. 2 angedeutet.1 shows a microwave transmitter 1 with a magnetron 4 which projects into a
Wird z.B. ein dünner, langer, elektrisch schlecht leitender Stab parallel zum obigen Spannungsvektor in den Hohlleiter gehalten, nimmt er Energie auf, d.h. er erwärmt sich. Wird er senkrecht zum Spannungsvektor in den Hohlleiter gehalten, so nimmt er keine Energie auf, weil die Ausdehnung des Stabes in die Richtung des Spannungsvektors zu klein ist.E.g. a thin, long, electrically poorly conductive rod held parallel to the above voltage vector in the waveguide, it absorbs energy, i.e. he warms up. If it is held perpendicular to the voltage vector in the waveguide, it does not absorb any energy because the extension of the rod in the direction of the voltage vector is too small.
Sind in einem Hohlraum Spannungsvektoren in alle drei Richtungen (Dimensionen) vorhanden, so wird der Stab immer aufgeheizt, unabhängig in welcher Richtung er im Hohlraum steht. Dieses illustriert, auf das Kochgut übertragen, die Bedeutung der Spannungsvektoren-Ausrichtung im Garraum 3. Der Garraum 3 bildet einen Hohlraum, in welchem bei herkömmlichen Anordnungen ein Spannungsvektor in der Richtung, in welcher er eingekoppelt wird, vorherrscht.If there are tension vectors in all three directions (dimensions) in a cavity, the rod is always heated, regardless of the direction in which it is in the cavity. Applied to the food, this illustrates the importance of the alignment of the voltage vectors in the
Der Hohlleiter 2 ist gemäss Fig. 1 an einen Resonatorraum 5 angeschlossen, der kastenförmig ausgestaltet ist. Dieser ist metallisch abgeschlossen und durch Koppelöffnungen 6 mit dem Garraum 3 verbunden. Die Koppelöffnungen sind in einer Trennwand 8 angeordnet, die dem Resonatorraum 5 und dem Garraum 3 gemeinsam ist. Die Koppelöffnungen 6, welche in ihren Abmessungen kleiner sind als die Trennwand 8 dienen dazu, die Ausrichtung des Mikrowellenfeldes in mehrere Richtungen zu bewirken. Dies kann auf verschiedene Arten erfolgen. Gemäss Fig. 1 wird durch die schlitzförmige Ausgestaltung der Koppelöffnungen 6 bewirkt, dass Spannungsvektoren Ex und Ey eingekoppelt werden, welche je senkrecht zur Schlitzausdehnung verlaufen.According to FIG. 1, the
Die Koppelöffnungen 6 können aber auch andere Formen (rund, quadratisch) aufweisen und z.B. quer im Raum 5 angeordnet sein, um das Feld so zu beeinflussen, dass im Garraum 3 eine möglichst gleichmässige Verteilung der Mikrowellenenergie in allen drei Dimensionen erreicht wird.The coupling openings 6 can also have other shapes (round, square) and e.g. be arranged transversely in
Erfindungsgemäss sind nun in diesem Resonatorraum 5 besondere Koppelelemente 9 in Form von Koppelstiften angeordnet, wie dies in Fig. 3 dargestellt ist. Mit diesen Koppelstiften kann erreicht werden, dass der Spannungsvektor Ez bereits im Resonatorraum 5 aus der Einkoppelrichtung auch in die übrigen zwei Richtungen Ex und EY gekoppelt wird. Solche Koppelelemente, welche als hohle oder volle Metallstifte ausgebildet sind, können mit unterschiedlichen Koppelöffnungen 6 kombiniert werden wie vorstehend erwähnt. In Fig. 3 ist eine kreisförmige Koppelöffnung 11 gezeigt.According to the invention,
Wie sich aus Fig. 3 ergibt sind die Koppelstifte 9 an den Kanten der oberen Deckfläche des Resonatorraums 5 befestigt und ragen in der gezeigten Weise in den Resonatorraum. Die Koppelstifte 9 sind dabei so angeordnet, dass sie etwa in einem Winkel α = 45° zur Einkopplungsrichtung z verlaufen. Jeder Koppelstift 9 definiert mit dieser Einkopplungsrichtung z eine Ebene, welche eine x-(bzw. y-) Achse festlegt, in welcher eine Spannungsvektorkomponente EX (bzw.EX) erzeugt wird.As can be seen from FIG. 3, the
Damit wird bereits im Resonatorraum die angestrebte Gleichverteilung der Mikrowellenenergie in den drei Dimensionen erzeugt, welche durch die Koppelöffnungen 6 in den Garraum übertragen wird.The desired uniform distribution of the microwave energy in the three dimensions, which is transmitted through the coupling openings 6 into the cooking chamber, is thus generated in the resonator chamber.
Während die bisher beschriebenen Massnahmen also die statische Gleichverteilung der Mikrowellenenergie in den drei Dimensionen anstreben, ist ferner auch erwünscht, das Mikrowellenfeld im Garraum 3 zu bewegen, um die im Garraum entstehenden heissen und kalten Punkte gegeneinanander zu verschieben und an Jeder Stelle eine gleichmassige Erwärmung des Kochguts zu ermöglichen. Hierfür ist gemäss Fig. 1 ein beweglicher Feldverteiler 7 (Propeller oder Drehantenne) im Resonatorraum 5 angeordnet. Das in der beschriebenen Weise ausgestaltete, mehrdimensional verteilte Mikrowellenfeld wird auf diese Weise zusätzlich bewegt. Der Feldverteiler 7 kann dazu auch im Garraum 3 selbst angeordnet sein.So while the measures described so far aim for the static uniform distribution of the microwave energy in the three dimensions, it is also desirable to move the microwave field in the
Schliesslich ist in Fig. 4 eine entsprechend ausgebildete Einkoppelungsvorrichtung gezeigt, bei welcher zwei Sender 1,1ʹ mittels je einem Hohlleiter 2,2ʹ an einen gemeinsamen Resonatorraum 5 angeschlossen sind, der seinerseits über Koppelöffnungen 11,11ʹ an den Garraum 3 gekoppelt ist. Die übrigen Teile, wie Koppelelemente und Feldverteiler, sind zur Vereinfachung in der Zeichnung nicht dargestellt.Finally, FIG. 4 shows an appropriately designed coupling device, in which two transmitters 1. The remaining parts, such as coupling elements and field distributors, are not shown in the drawing for the sake of simplicity.
Der beschriebene Einkopplungsresonator kann wahlweise an der Deck- oder Grundfläche des Garraums oder an einer seiner Seitenflächen angesetzt sein. Der Hohlleiter 2 mündet dabei jeweils an einer Seite 10 des kastenförmigen Resonatorraums 5, welche an die Trennwand 8 zum Garraum anstösst.The coupling resonator described can optionally be attached to the top or base surface of the cooking space or to one of its side surfaces. The
Mit der beschriebenen Vorrichtung wird ein Einkoppelsystem beschrieben, mit dem nebst der besseren Entkopplung von Sender und Garraum auch verschiedene Möglichkeiten gegeben sind, das Mikrowellenfeld vor und während der Einkopplung in den Garraum in allen drei Dimensionen auszurichten. Der Feldverteiler bewegt zusätzlich das Mikrowellenfeld in allen drei Dimensionen. Daraus erfolgt eine optimale Wärmeverteilung im Garraum.With the device described, a coupling system is described with which, in addition to the better decoupling of the transmitter and the cooking space, there are also various possibilities for aligning the microwave field in all three dimensions before and during the coupling into the cooking space. The field distributor also moves the microwave field in all three dimensions. This results in optimal heat distribution in the cooking space.
Claims (9)
- Device for coupling a field of microwaves in a microwave oven, where the microwave field generated by at least one microwave emitter (1) is led through at least one waveguide (2) to the cooking enclosure (3) of the oven, and where a metallically closed resonance chamber (5) is provided between the cooking enclosure (3) and the waveguide (2), which chamber is connected to the waveguide and coupled to the cooking enclosure (3) through coupling apertures (6), characterized in that stationary coupling organs (9) are mounted in the resonance chamber (5) for coupling the tension vector from the input direction (Ez) into the other two dimensions (Ex, Ey).
- Device according to claim 1, characterized in that two coupling bars (9) are provided as coupling organs (9) and inclined approximately at 45° with respect to the input direction, with which each coupling bar defines a plane that is perpendicular to the plane defined by the other bar and the input direction.
- Device according to any preceding claim, characterized in that the resonance chamber is separated from the cooking enclosure (3) by a metallic separating wall (8) which comprises at least one coupling aperture (6), the dimensions of which are smaller than those of the wall.
- Device according to claim 3, characterized in that the coupling apertures (6) are shaped so that the resulting tension vectors of the microwave field are uniformly coupled into the cooking enclosure.
- Device according to any of claims 2 to 4, characterized in that the resonance chamber (5) is essentially box-shaped, the waveguide ending at one wall (10) which is adjacent to the separating wall (8), and in that the coupling bars (9) are fixed in the region of the cover wall which lies opposite to the separating wall.
- Device according to claim 5, characterized in that the coupling bars are fixed approximately in the centres of two adjacent edges of the cover wall.
- Device according to any preceding claim, characterized in that a mobile field distributor (7) is mounted in the closed resonance chamber (5).
- Device according to any preceding claim, characterized in that a field distributor is provided in the cooking enclosure.
- Device according to any preceding claim, characterized in that several microwave emitters (1, 1') are provided, and connected to the resonance chamber (5) via waveguides (2, 2').
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH113787A CH674563A5 (en) | 1987-03-24 | 1987-03-24 | |
| CH1137/87 | 1987-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0284958A1 EP0284958A1 (en) | 1988-10-05 |
| EP0284958B1 true EP0284958B1 (en) | 1992-06-03 |
Family
ID=4203355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19880104551 Expired - Lifetime EP0284958B1 (en) | 1987-03-24 | 1988-03-22 | Device for coupling a micro-wave field to a micro-wave oven |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0284958B1 (en) |
| CH (1) | CH674563A5 (en) |
| DE (1) | DE3871587D1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2751055B1 (en) * | 1996-07-15 | 1998-09-25 | Moulinex Sa | ELECTRIC COOKING OVEN |
| US6097018A (en) * | 1998-04-06 | 2000-08-01 | Lg Electronics Inc. | Circular polarization generating system for microwave oven |
| EP3448121B1 (en) * | 2017-08-23 | 2020-12-23 | Vorwerk & Co. Interholding GmbH | Microwave feed-in device on a microwave oven |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1081987B (en) * | 1959-05-16 | 1960-05-19 | Philips Patentverwaltung | Arrangement for feeding microwave energy into the working space of a dielectric heating device |
| SE375680B (en) * | 1973-08-17 | 1975-04-21 | Philips Svenska Ab | |
| DE3022235C2 (en) * | 1980-06-13 | 1982-10-21 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Microwave heating device |
| DE3028009A1 (en) * | 1980-07-24 | 1982-02-18 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Microwave oven with even heat cooking distribution - has radiator in front of apertured microwave distribution plate incorporated in oven wall |
-
1987
- 1987-03-24 CH CH113787A patent/CH674563A5/de not_active IP Right Cessation
-
1988
- 1988-03-22 EP EP19880104551 patent/EP0284958B1/en not_active Expired - Lifetime
- 1988-03-22 DE DE8888104551T patent/DE3871587D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0284958A1 (en) | 1988-10-05 |
| CH674563A5 (en) | 1990-06-15 |
| DE3871587D1 (en) | 1992-07-09 |
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