US3643055A - High-frequency heating apparatus - Google Patents

High-frequency heating apparatus Download PDF

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Publication number
US3643055A
US3643055A US92984A US3643055DA US3643055A US 3643055 A US3643055 A US 3643055A US 92984 A US92984 A US 92984A US 3643055D A US3643055D A US 3643055DA US 3643055 A US3643055 A US 3643055A
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Prior art keywords
heating chamber
frequency
outer conductor
energy distribution
heating
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Expired - Lifetime
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US92984A
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Ryuji Suzuki
Seiki Yokozeki
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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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
    • H05B6/74—Mode transformers or mode stirrers
    • 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

Definitions

  • a high-frequency heating apparatus in which the highfrequency energy is' uniformly distributed in a heating chamber for effectively heating the matter in the heating chamber.
  • An energy distribution modifying means is provided in conformity to the shape of the heating chamber and on at least one of. coaxial inner and outer conductors defining a cylindrical passage, which communicates with a waveguide coupled to a higr-frequency oscillator. The high-frequency energy from the high-frequency oscillator is guided through the waveguide and the cylindrical passage to enter the heating chamber and is unifonnly distributed in the heating chamber through the energy distribution modifying means.
  • FIG. 1 is a perspective view, partly broken away, showing a high-frequency heating apparatus, with a top cover removed, embodying the invention
  • FIG. 2 is a fragmentary sectional view, to an enlarged scale, showing in detail an inner and outer'conductor of a coaxial guide in the apparatus of FIG. I;
  • FIGS. 3 to show respective layouts of the heating chamber as well as respective energy distribution correcting means conforming to the shape of the heating chamber in the highfrequency heating apparatus according to the invention.
  • FIGS. 6 to are fragmentary perspective views showing examples of the energy distribution correcting means according to the invention.
  • a high-frequency heating apparatus having a heating chamber defined by top and bottom chamber walls 2 and 3, a front door 4 as well as by side and rear chamber walls (not indicated).
  • the door 4 of the hearing chamber 1 is hinged by hinges 5 to a support base and carries a door handle 6 to open and close it.
  • the heating chamber 1 is electromagnetically isolated from the outside when the door 4 is closed. Outside the heating chamber 1 is disposed a' rectangular or boxlike waveguide 7 secured by means of bolts 8 and nuts 9 to the top chamber wall 2 of the heating chamber 1.
  • the waveguide 7 extends rearwardly ofthe heating chamber Land it is coupled to a high-frequency oscillator 10- disposed undemeath its rear portion and having a radiating antenna extending within the waveguide 7.
  • the waveguide 7 communicates with a cylindrical passage fonned by a hollow cylindrical outer conductor 12 and a coaxial inner conductor 17.
  • the outer conductor 12 is disposed centrally on the top of the heating chamber 1 and penetrates both the top wall of the heating chamber 1 and bottom wall of the waveguide 7. It is formed at its upper end with a flange 13, which is secured by means of welding to the waveguide 7, and at its lower end with lower extensions 14 radially spaced to correspond to the comers of the heating chamber 1, as is most clearly shown in FIG. 2.
  • the extensions 14 constitute an energy distribution correcting means to provide unifonn energy distribution in the heating chamber 1.
  • the inner conductor 17 is secured to the lower end of a drive shaft 15 of an insulating material such as polypropylene penetrating the top wall of the waveguide 7 and leading to a motor 16 suitably mounted on top of the waveguide 7.
  • the upper end of the inner conductor 17 is located within the waveguide 7, and the lower end thereof is located within the heating chamber 1 and carries a rotary wing secured thereto by means of bolts 19 and 19'.
  • the rotary wing 20 has integral fins 22 and constitutes a field stirrer.
  • a power source 21 for the high-frequency oscillator I0 is installed on the support base.
  • ductor I7 distributed thereby within the heating chamber I and absorbed by the matter being heated (not shown).
  • the rotary field stirrer wing 20 made of ametallic material according to the invention provides the function of a kind of antenna, which may be obtained by appropriately adjusting the length of the wing, and promotes the uniform distribution of the energy radiated from the wing in the heating chamber I as the wing is rotated.
  • the uniform energy distribution is further assisted by the fins 22 integralwith the wing 20, which stir the energy 7 reflected from the chamber walls of the heating chamber I.
  • the rotary wing 20together with the integral fins 22 might provide truly uniform energy distribution in the heating chamber if the heating chamber-were cylindrical.
  • a sort of directivity conforming to the layout of the heating chamber is necessary.
  • the extensions 14 are provided for this purpose, andthey constitute an energy distribution modifying means. They are radially spaced'in conformity to the layout of the heating chamber I.
  • FIGS. 3 to 5 show'examples of the arrangement of the energy distribution modifying means 14 conforming to different layouts or shapes of the heating chamber 1.
  • Other arrangements of the energy distribution modifying means in conformity to other differentshapes of the heating chamber are of tor or the innerconductor or to both the inner and outer concourse possible.
  • the arrangement of the energy distribution modifying means shownin FIG. 3 conforms to the square layout of the heating chamber.
  • the arrangement in FIG. 4 conforms to a rectangular layout, and the arrangement in FIG. 5 to a hexagonal layout.
  • the configuration and dimensions of the energy distribution modifying means may also be determined in con- I vided, which are similarly located and spaced.
  • notches 25 are formed, which are similarly located and spaced.
  • portions 26 of an increased wall thickness are formed, which are similarly located and spaced.
  • the energy distribution modifying means may be provided to either the outer conducductors, in place of providing to the outer conductor as in the foregoing embodiments.
  • the filed stirrer in the foregoing embodiment is provided to the inner rotary conductor, the same effects may be obtained by providing the field beater to an outer conductor, which is rotary, and which holds the inner conductor stationary.
  • a high-frequency apparatus comprising a high-frequency oscillator; a heating chamber for heating substances to be heated by the high-frequency energy produced from-said highfrequency oscillator; a first waveguide for guiding the highfrequency energy from said high-frequency oscillator to said heating chamber; a second waveguide connected with said first waveguide, said second waveguide being a coaxial line consisting of a hollow cylindrical outer conductor projecting into the heating chamber and an inner conductor extending through and coaxial with said outer conductor; at least one stirrer attached to the inner conductor and rotated by a drive shaft provided in the inner conductor; and a part for modifying the energy distribution in the heating chamber uniformly formed on the outer conductor, said part corresponding to the shape of the heating chamber.
  • a high-frequency heating apparatus wherein said distribution modifying part consists of protuberances'formed on the outer conductor, said protuberances corresponding to the respective comers or sidewalls of the heating chamber.
  • a high-frequency heating apparatus wherein said energy distribution modifying part consists of metal pins provided on the outer conductor, said metal pins corresponding to the respective comers or sidewalls of said heating chamber.
  • a high-frequency heating apparatus according to claim I,
  • apertures formed in the outer conductor said apertures corresponding to the respective comers or sidewalls of said heating chamber.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

A high-frequency heating apparatus, in which the high-frequency energy is uniformly distributed in a heating chamber for effectively heating the matter in the heating chamber. An energy distribution modifying means is provided in conformity to the shape of the heating chamber and on at least one of coaxial inner and outer conductors defining a cylindrical passage, which communicates with a waveguide coupled to a high-frequency oscillator. The high-frequency energy from the high-frequency oscillator is guided through the waveguide and the cylindrical passage to enter the heating chamber and is uniformly distributed in the heating chamber through the energy distribution modifying means.

Description

United States Patent 4 Suzuki et al.
' APPARATUS [72] Inventors: Ryull Suzuki, Nara; Selkl Yohnekl, Ya-
matokoriyama-shi, both of Japan [73] Assignee: Mllfllfllllll Electric llldlll'lfl C0,, Ltd
Osaka, Japan [22] Filed: Nov. 27, 1970 [21] Appl. No.: 92,984
[30] Foreign Application Priority Data Dec. 1, 1969 Japan..." ..44/96984 [52] US." 9/10-55 [51] Int. Cl. "0510 9/06- [58] neldolsearchn'w, ..219/10.5 5
[56] RefermcesClted UNITED STATES PATENTS 3,436,507 4/1969 Puschner "219/1055 3,532,847 10/1970 Puschner ..2l9/10.55 3,364,332 1/1968 Reftmark 219/1055 3,422,240 1/1969 Parker .219/ 10.55
HIGH-FREQUENCY HEATING 3,643,055 r451 Fears, 19 72 3/l969 Anderson Haagensen ..2l9/ 10.55
Primary Examiner-J. V. Truhe Assistant Examiner -l-lugh D. .laeger Attorney-Stevens, Davis, Miller8z Mosher 1 1 ABSTRACT A high-frequency heating apparatus, in which the highfrequency energy is' uniformly distributed in a heating chamber for effectively heating the matter in the heating chamber. An energy distribution modifying means is provided in conformity to the shape of the heating chamber and on at least one of. coaxial inner and outer conductors defining a cylindrical passage, which communicates with a waveguide coupled to a higr-frequency oscillator. The high-frequency energy from the high-frequency oscillator is guided through the waveguide and the cylindrical passage to enter the heating chamber and is unifonnly distributed in the heating chamber through the energy distribution modifying means.
6 Claims, 10 Drawing Figures PAIENIEDFEB 15 I972 SHEET 2 BF 2 FIG.3
FIG.4
v tively heating the matter therein.
correcting means to obviate the nonuniformity of energy distribution in the heating chamber.
The invention will nowbe described in connection with a preferred embodiment thereof with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view, partly broken away, showing a high-frequency heating apparatus, with a top cover removed, embodying the invention;
FIG. 2 is a fragmentary sectional view, to an enlarged scale, showing in detail an inner and outer'conductor of a coaxial guide in the apparatus of FIG. I;
FIGS. 3 to show respective layouts of the heating chamber as well as respective energy distribution correcting means conforming to the shape of the heating chamber in the highfrequency heating apparatus according to the invention; and
FIGS. 6 to are fragmentary perspective views showing examples of the energy distribution correcting means according to the invention.
Referring to FIGS. 1 and 2, a high-frequency heating apparatus according to the invention is shown having a heating chamber defined by top and bottom chamber walls 2 and 3, a front door 4 as well as by side and rear chamber walls (not indicated). The door 4 of the hearing chamber 1 is hinged by hinges 5 to a support base and carries a door handle 6 to open and close it. The heating chamber 1 is electromagnetically isolated from the outside when the door 4 is closed. Outside the heating chamber 1 is disposed a' rectangular or boxlike waveguide 7 secured by means of bolts 8 and nuts 9 to the top chamber wall 2 of the heating chamber 1. The waveguide 7 extends rearwardly ofthe heating chamber Land it is coupled to a high-frequency oscillator 10- disposed undemeath its rear portion and having a radiating antenna extending within the waveguide 7. The waveguide 7 communicates with a cylindrical passage fonned by a hollow cylindrical outer conductor 12 and a coaxial inner conductor 17. The outer conductor 12 is disposed centrally on the top of the heating chamber 1 and penetrates both the top wall of the heating chamber 1 and bottom wall of the waveguide 7. It is formed at its upper end with a flange 13, which is secured by means of welding to the waveguide 7, and at its lower end with lower extensions 14 radially spaced to correspond to the comers of the heating chamber 1, as is most clearly shown in FIG. 2. The extensions 14 constitute an energy distribution correcting means to provide unifonn energy distribution in the heating chamber 1. The inner conductor 17 is secured to the lower end of a drive shaft 15 of an insulating material such as polypropylene penetrating the top wall of the waveguide 7 and leading to a motor 16 suitably mounted on top of the waveguide 7. The upper end of the inner conductor 17 is located within the waveguide 7, and the lower end thereof is located within the heating chamber 1 and carries a rotary wing secured thereto by means of bolts 19 and 19'. The rotary wing 20 has integral fins 22 and constitutes a field stirrer. A power source 21 for the high-frequency oscillator I0 is installed on the support base.
ductor I7, distributed thereby within the heating chamber I and absorbed by the matter being heated (not shown).
It will be appreciated that the rotary field stirrer wing 20 made of ametallic material according to the invention provides the function of a kind of antenna, which may be obtained by appropriately adjusting the length of the wing, and promotes the uniform distribution of the energy radiated from the wing in the heating chamber I as the wing is rotated.
Besides, the uniform energy distribution is further assisted by the fins 22 integralwith the wing 20, which stir the energy 7 reflected from the chamber walls of the heating chamber I.
The rotary wing 20together with the integral fins 22 might provide truly uniform energy distribution in the heating chamber if the heating chamber-were cylindrical. For truly uniform energy distribution in the heating chamber of an otherthan circular layout, a sort of directivity conforming to the layout of the heating chamber is necessary. The extensions 14 are provided for this purpose, andthey constitute an energy distribution modifying means. They are radially spaced'in conformity to the layout of the heating chamber I.
FIGS. 3 to 5 show'examples of the arrangement of the energy distribution modifying means 14 conforming to different layouts or shapes of the heating chamber 1. Other arrangements of the energy distribution modifying means in conformity to other differentshapes of the heating chamber are of tor or the innerconductor or to both the inner and outer concourse possible.
The arrangement of the energy distribution modifying means shownin FIG. 3 conforms to the square layout of the heating chamber. The arrangement in FIG. 4 conforms to a rectangular layout, and the arrangement in FIG. 5 to a hexagonal layout. The configuration and dimensions of the energy distribution modifying means may also be determined in con- I vided, which are similarly located and spaced. In the embodiment of FIG. 8, notches 25 are formed, which are similarly located and spaced. In the embodiment of FIG. 9, portions 26 of an increased wall thickness are formed, which are similarly located and spaced. In the embodiment of FIG. 10, apertures 27-are formed, which are similarly located and spaced. These energy distribution modifying means have the same effect of providing truly uniform energy distribution in the heating chamber. I
Other examples of the energy distribution modifying means in respect of configuration and dimensions are also possible in' accordance with the invention.
In accordance with the invention the energy distribution modifying means may be provided to either the outer conducductors, in place of providing to the outer conductor as in the foregoing embodiments.
Further, although the filed stirrer in the foregoing embodiment is provided to the inner rotary conductor, the same effects may be obtained by providing the field beater to an outer conductor, which is rotary, and which holds the inner conductor stationary.
1 What is claimed is:
I. A high-frequency apparatus comprising a high-frequency oscillator; a heating chamber for heating substances to be heated by the high-frequency energy produced from-said highfrequency oscillator; a first waveguide for guiding the highfrequency energy from said high-frequency oscillator to said heating chamber; a second waveguide connected with said first waveguide, said second waveguide being a coaxial line consisting of a hollow cylindrical outer conductor projecting into the heating chamber and an inner conductor extending through and coaxial with said outer conductor; at least one stirrer attached to the inner conductor and rotated by a drive shaft provided in the inner conductor; and a part for modifying the energy distribution in the heating chamber uniformly formed on the outer conductor, said part corresponding to the shape of the heating chamber. I
2. A high-frequency heating apparatus according to claim 1, wherein said distribution modifying part consists of protuberances'formed on the outer conductor, said protuberances corresponding to the respective comers or sidewalls of the heating chamber.
3. A high-frequency heating apparatus according to claim 1, wherein said energy distribution modifying part consists of metal pins provided on the outer conductor, said metal pins corresponding to the respective comers or sidewalls of said heating chamber.
portions of an increased thickness formed on said outer conductor, said increased thickness portions corresponding to the comers or sidewalls of said heating chamber. 6. A high-frequency heating apparatus according to claim I,
. wherein said energy distribution modifying part consists of 4. A high-frequency heating apparatus according to claim 1,
apertures formed in the outer conductor, said apertures corresponding to the respective comers or sidewalls of said heating chamber.
' s a a: a:

Claims (6)

1. A high-frequency apparatus comprising a high-frequency oscillator; a heating chamber for heating substances to be heated by the high-frequency energy produced from said high-frequency oscillator; a first waveguide for guiding the high-frequency energy from said high-frequency oscillator to said heating chamber; a second waveguide connected with said first waveguide, said second waveguide being a coaxial line consisting of a hollow cylindrical outer conductor projecting into the heating chamber and an inner conductor extending through and coaxial with said outer conductor; at least one stirrer attached to the inner conductor and rotated by a drive shaft provided in the inner conductor; and a part for modifying the energy distribution in the heating chamber uniformly formed on the outer conductor, said part corresponding to the shape of the heating chamber.
2. A high-frequency heating apparatus according to claim 1, wherein said distribution modifying part consists of protuberances formed on the outer conductor, said protuberances corresponding to the respective corners or sidewalls of the heating chamber.
3. A high-frequency heating apparatus according to claim 1, wherein said energy distribution modifying part consists of metal pins provided on the outer conductor, said metal pins corresponding to the respective corners or sidewalls of said heating chamber.
4. A high-frequency heating apparatus according to claim 1, wherein said energy distribution modifying part consists of notches formed in the outer conductor, said notches corresponding to the respective corners or sidewalls of said heating chamber.
5. A high-frequency heating apparatus according to claim 1, wherein said energy distribution modifying part consists of portions of an increased thickness formed on said outer conductor, said increased thickness portions corresponding to the corners or sidewalls of said heating chamber.
6. A high-frequency heating apparatus according to claim 1, wherein said energy distribution modifying part consists of apertures formed in the outer conductor, said apertures corresponding to the respective corners or sidewalls of said heating chamber.
US92984A 1969-12-01 1970-11-27 High-frequency heating apparatus Expired - Lifetime US3643055A (en)

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JP44096984A JPS4837532B1 (en) 1969-12-01 1969-12-01

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DE (1) DE2058901C3 (en)
FR (1) FR2072618A5 (en)
GB (1) GB1328548A (en)
SE (1) SE361523B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798404A (en) * 1972-12-21 1974-03-19 Gen Electric Electronic oven with mode exciter
US3975606A (en) * 1973-12-18 1976-08-17 Matsushita Electric Industrial Co., Ltd. Microwave oven with uniform electric field distribution
DE2622173A1 (en) * 1975-05-19 1976-12-02 Matsushita Electric Ind Co Ltd DEVICE FOR HEATING AN OBJECT WITH HIGH FREQUENCY RADIATION, IN PARTICULAR MICROWAVE OVEN
DE2844128A1 (en) 1977-10-14 1979-04-19 Bosch Siemens Hausgeraete MICROWAVE OVEN
US4185181A (en) * 1976-10-18 1980-01-22 Hitachi Heating Appliances Co., Ltd. Microwave oven
US4314127A (en) * 1977-11-02 1982-02-02 Raytheon Company Microwave oven with rotating multiport radiator
US4324967A (en) * 1978-07-18 1982-04-13 Matsushita Electric Industrial Co., Ltd. Microwave heating apparatus having magnetic coupling for driving the antenna
US4327266A (en) * 1980-09-12 1982-04-27 Amana Refrigeration, Inc. Microwave ovens for uniform heating
DE2857841C1 (en) * 1977-10-14 1982-07-15 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Microwave oven
US5272302A (en) * 1991-12-17 1993-12-21 Raytheon Company Microwave oven with improved cooking uniformity

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823295A (en) * 1973-01-02 1974-07-09 Gen Electric Electronic oven with mode exciter and tuning probes
CA1105567A (en) * 1976-12-23 1981-07-21 Raytheon Company Radiating mode stirrer for microwave heating system
JPS53100641A (en) * 1977-02-14 1978-09-02 Teruo Adachi Apparatus for removing snow for buildings
JPS543938A (en) * 1977-06-09 1979-01-12 Matsushita Electric Ind Co Ltd High-frequency heating system
CA1118844A (en) * 1977-11-02 1982-02-23 Bernard J. Weiss Combination microwave oven with a multi-port radiator
DE2850236C2 (en) * 1977-12-19 1981-10-08 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Microwave oven
CA1134449A (en) * 1978-12-01 1982-10-26 John M. Osepchuk Microwave oven having rotating conductive radiators
US6072168A (en) * 1996-08-17 2000-06-06 Forschungszentrum Karlsruhe Gmbh Microwave resonator for the high temperature treatment of materials
DE19633245C1 (en) * 1996-08-17 1997-11-27 Karlsruhe Forschzent High mode microwave resonator for high temperature treatment of materials

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US2920174A (en) * 1957-06-28 1960-01-05 Raytheon Co Microwave ovens
US3353968A (en) * 1963-02-01 1967-11-21 Litton Prec Products Inc Food package for use in microwave heating apparatus
US3364332A (en) * 1964-03-20 1968-01-16 Philips Corp Arrangement in microwave stoves
US3366769A (en) * 1964-12-11 1968-01-30 Philips Corp High frequency heating apparatus
US3422240A (en) * 1965-11-18 1969-01-14 Rca Corp Microwave oven
US3431381A (en) * 1966-03-29 1969-03-04 Tappan Co The Dual stirrer assembly
US3436506A (en) * 1965-04-08 1969-04-01 Microtherm Ltd Electronic heating apparatus
US3436507A (en) * 1965-06-12 1969-04-01 Herbert August Puschner Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator
US3505491A (en) * 1968-01-24 1970-04-07 Royden R Freeland Stirrer for microwave ovens
US3532847A (en) * 1965-06-05 1970-10-06 Herbert August Puschner Device for heating non-metallic material

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920174A (en) * 1957-06-28 1960-01-05 Raytheon Co Microwave ovens
US3353968A (en) * 1963-02-01 1967-11-21 Litton Prec Products Inc Food package for use in microwave heating apparatus
US3364332A (en) * 1964-03-20 1968-01-16 Philips Corp Arrangement in microwave stoves
US3366769A (en) * 1964-12-11 1968-01-30 Philips Corp High frequency heating apparatus
US3436506A (en) * 1965-04-08 1969-04-01 Microtherm Ltd Electronic heating apparatus
US3532847A (en) * 1965-06-05 1970-10-06 Herbert August Puschner Device for heating non-metallic material
US3436507A (en) * 1965-06-12 1969-04-01 Herbert August Puschner Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator
US3422240A (en) * 1965-11-18 1969-01-14 Rca Corp Microwave oven
US3431381A (en) * 1966-03-29 1969-03-04 Tappan Co The Dual stirrer assembly
US3505491A (en) * 1968-01-24 1970-04-07 Royden R Freeland Stirrer for microwave ovens

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798404A (en) * 1972-12-21 1974-03-19 Gen Electric Electronic oven with mode exciter
US3975606A (en) * 1973-12-18 1976-08-17 Matsushita Electric Industrial Co., Ltd. Microwave oven with uniform electric field distribution
DE2622173A1 (en) * 1975-05-19 1976-12-02 Matsushita Electric Ind Co Ltd DEVICE FOR HEATING AN OBJECT WITH HIGH FREQUENCY RADIATION, IN PARTICULAR MICROWAVE OVEN
US4476362A (en) * 1975-05-19 1984-10-09 Matsushita Electric Industrial Co., Ltd. High frequency heating apparatus
US4185181A (en) * 1976-10-18 1980-01-22 Hitachi Heating Appliances Co., Ltd. Microwave oven
DE2844128A1 (en) 1977-10-14 1979-04-19 Bosch Siemens Hausgeraete MICROWAVE OVEN
DE2857841C1 (en) * 1977-10-14 1982-07-15 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Microwave oven
US4314127A (en) * 1977-11-02 1982-02-02 Raytheon Company Microwave oven with rotating multiport radiator
US4324967A (en) * 1978-07-18 1982-04-13 Matsushita Electric Industrial Co., Ltd. Microwave heating apparatus having magnetic coupling for driving the antenna
US4327266A (en) * 1980-09-12 1982-04-27 Amana Refrigeration, Inc. Microwave ovens for uniform heating
US5272302A (en) * 1991-12-17 1993-12-21 Raytheon Company Microwave oven with improved cooking uniformity

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Publication number Publication date
FR2072618A5 (en) 1971-09-24
SE361523B (en) 1973-11-05
JPS4837532B1 (en) 1973-11-12
DE2058901A1 (en) 1971-06-09
GB1328548A (en) 1973-08-30
DE2058901C3 (en) 1974-05-09
DE2058901B2 (en) 1973-10-11

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