US3814890A - Microwave oven having a magnetron extending directly into the oven cavity - Google Patents

Microwave oven having a magnetron extending directly into the oven cavity Download PDF

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Publication number
US3814890A
US3814890A US00360763A US36076373A US3814890A US 3814890 A US3814890 A US 3814890A US 00360763 A US00360763 A US 00360763A US 36076373 A US36076373 A US 36076373A US 3814890 A US3814890 A US 3814890A
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US
United States
Prior art keywords
oven
cavity
microwave energy
microwave
magnetron
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
Application number
US00360763A
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English (en)
Inventor
E Klemp
V Cassibo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northrop Grumman Guidance and Electronics Co Inc
Original Assignee
Litton Systems Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Litton Systems Inc filed Critical Litton Systems Inc
Priority to US00360763A priority Critical patent/US3814890A/en
Priority to GB5904573A priority patent/GB1454079A/en
Priority to DE19742402693 priority patent/DE2402693C3/de
Priority to CA190,688A priority patent/CA961931A/en
Priority to FR7403637A priority patent/FR2230144B1/fr
Priority to JP49053918A priority patent/JPS5019039A/ja
Application granted granted Critical
Publication of US3814890A publication Critical patent/US3814890A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/72—Radiators or antennas

Definitions

  • the microwave oven comprises a housing having an oven cavity defined by conductively bound surfaces.
  • One of the surfaces preferably the bottom surface, is of a horn-like structure having diverging surfaces facing the interior of the cavity.
  • An aperture is located at the center portion of the horn-like structure to receive the radiating portion of a magnetron tube to enable the magnetron to feed microwave energy directly into the oven cavity.
  • the outer portion of the diverging surfaces adjoins a cylindrical surface, the radius of the cylinder being a multiple of the wave length of the radiated microwaves.
  • the present invention relates generally to microwave ovens and more particularly to microwave ovens in which the source of microwave energy radiates directly into the oven cavities.
  • the magnetrons, or other microwave generators are usually positioned entirely outside of the oven cavities.
  • the radiating portions of the tubes communicate with the oven cavities via wave guides.
  • These wave guides are usually rectangularly or cylindrically shaped, having one end enveloping the radiating portion of the magnetron, and the other end communicating with a rectangular feed box which, in turn, opens into the oven cavity.
  • microwave ovens also have mechanical stirrers positioned either within the feed boxes or within the oven cavities adjacent the openings of the feed boxes in order to assist in evenly distributing the microwave energy throughout the oven cavities.
  • the present invention obviates the above-mentioned shortcomings by providing a microwave oven that eliminates. the need for a wave guide and stirrer, while achieving an even distribution of energy within the area to feed microwave energy directly into the cavity. In this manner, the one surface functions to evenly distribute the microwave energy throughout the oven cavity.
  • the outer portions of the one surface adjoin a cylindrical surface the radius of which is a multiple of the wave length of the radiated microwaves.
  • FlGsl illustrates a microwave oven, generally indicated by arrow 10, having a housing formed by a plurality of outer walls 11.
  • the housing also includes a front face12 forming an opening into an oven cavity 13.
  • An oven door 14 is pivotally mounted on the front face 12 of the oven and is adapted to completely enclose the opening of the cavity l3 and extend over the front face 12 of theoven forming the opening.
  • the oven door 14 can be of the type described in Assignees copending US. Pat. applicationsSer. Nos. 266,059 and 292,529.
  • the outer end of the oven door 14 includes a latch assembly 15 having a plurality of hooked latches 16 which are adapted to extend into a plurality of openings 17 formed on the front face 12 of the oven in order to be engaged by a plurality of spring-biased catches (not shown).
  • the latch assembly is disclosed in Assignees copending US. Pat. application Ser. No. 290,000.
  • a door release lever I8 is located on the control panel 19 of the oven which functions to activate the springbiased catches to unlock the hooked latches 16 to open the oven door 14.
  • the cavity 13 is formed by a plurality of conductively-bound surfaces 20 which are formed by a plurality of rectangular walls located on the three sides and on the top side of the cavity 13.
  • the bottom side of cavity 13 is hidden from view in FIG. 1 and will be more fully described hereinafter.
  • a ceramic panel 21, which functions as a shelf, is located over the bottom side of the cavity 13.
  • the side walls 20 and the front face 12 are joined at their corners, as illustrated. .
  • the front face 12 includes an annular cavity 22 which functions as a choke and is adapted to receive a quantity of dielectric material 23.
  • This choke structure is more fully described in Assignees copending US. Pat. application, Ser. No. 266,059.
  • the bottom forming the large circular aperture 26 which is adapted to receive a horn-like structure 25.
  • the horn-like structure 25 comprises a frusto-conical surface 27 diverging outwardly into the interior of the oven cavity 13.
  • the conical surface 27 forms an interior angle a with the adjoining side walls which is greater than 90.
  • the diverging surfaces 27 have opposed angles (one of which is shown as angle B) of less than 180.
  • the outer portions of the conical surface 27 adjoin a cylindrical surface 28.
  • the radiusof the cylinder is approximately 4% inches, which is substantially equal to the wavelength of the microwave energy having a frequency of 2,450 megahertz.
  • the top surface of the horn-like structure is bent outwardly in a flat plane 29 which is adapted to extend over and be supported by the flanged surface 24.
  • the central portion 31 of the horn-like structure 25, which forms the truncated portion thereof, includes an aperture 32 extending therethrough. This truncated portion supports a flange 33 which in turn functions as a support for a magnetron 34.
  • the magnetron 34 includes a plurality of cooling fins 35 which are adapted to extend around the magnetron tube 36.
  • the magnetron 36 includes a radiating portion 37 which is adapted to extend through the aperture 32.
  • the conical surface 27 also includes a plurality of air or cooling holes 38 mounted on both sides of the aperture 32.
  • a microwave oven comprising: an oven cavity defined by conductively bounded surfaces;
  • a source of microwave energy mounted adjacent said one surface, said source of microwave energy comprising a magnetron having a radiating portion extending through said aperture into said cavity.
  • a microwave oven comprising:
  • one of said surfaces forming a horn-like structure having diverging surfaces facing the interior of said cavity, said diverging surfaces having opposed angles of less than the central portion of said horn-like structure further including an aperture formed therein;
  • a source of microwave energy mounted within said horn-like structure, said source of microwave energy comprising a magnetron having a radiating portion extending through said aperture into said cavity.
  • a microwave oven comprising:
  • one of said surfaces extending toward adjoining surfaces at internal angles which are greater than 90, said one surface further including an aperture formed therein;
  • a source of microwave energy mounted adjacent said one surface, said source of microwave energy comprising a magnetron having a radiating portion extending through said aperture into said cavity.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)
US00360763A 1973-05-16 1973-05-16 Microwave oven having a magnetron extending directly into the oven cavity Expired - Lifetime US3814890A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00360763A US3814890A (en) 1973-05-16 1973-05-16 Microwave oven having a magnetron extending directly into the oven cavity
GB5904573A GB1454079A (en) 1973-05-16 1973-12-20 Microwave oven
DE19742402693 DE2402693C3 (de) 1973-05-16 1974-01-21 Mikrowellenherd
CA190,688A CA961931A (en) 1973-05-16 1974-01-22 Microwave oven
FR7403637A FR2230144B1 (enrdf_load_stackoverflow) 1973-05-16 1974-02-04
JP49053918A JPS5019039A (enrdf_load_stackoverflow) 1973-05-16 1974-05-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00360763A US3814890A (en) 1973-05-16 1973-05-16 Microwave oven having a magnetron extending directly into the oven cavity

Publications (1)

Publication Number Publication Date
US3814890A true US3814890A (en) 1974-06-04

Family

ID=23419321

Family Applications (1)

Application Number Title Priority Date Filing Date
US00360763A Expired - Lifetime US3814890A (en) 1973-05-16 1973-05-16 Microwave oven having a magnetron extending directly into the oven cavity

Country Status (5)

Country Link
US (1) US3814890A (enrdf_load_stackoverflow)
JP (1) JPS5019039A (enrdf_load_stackoverflow)
CA (1) CA961931A (enrdf_load_stackoverflow)
FR (1) FR2230144B1 (enrdf_load_stackoverflow)
GB (1) GB1454079A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210915A (en) * 1977-10-05 1980-07-01 Endress U. Hauser Gmbh U. Co. Microwave antenna with exponentially expanding horn structure
WO1980001461A1 (en) * 1979-01-11 1980-07-24 Bsd Medical Corp Apparatus for electromagnetic radiation of living tissue and the like
DE3117709A1 (de) * 1980-05-05 1982-02-25 Raytheon Co., 02173 Lexington, Mass. Mikrowellenzufuehrungseinrichtung fuer mikrowellenoefen
US4354083A (en) * 1980-11-05 1982-10-12 General Electric Company Microwave oven with novel energy distribution arrangement
US4414453A (en) * 1978-12-21 1983-11-08 Raytheon Company Microwave oven feed apparatus
US4431888A (en) * 1978-12-21 1984-02-14 Amana Refrigeration, Inc. Microwave oven with improved feed structure
US4496814A (en) * 1983-01-10 1985-01-29 General Electric Company Microwave excitation system
EP0632677A3 (en) * 1993-06-30 1995-02-22 Sanyo Electric Co Microwave oven with antenna for radiating microwaves.
ES2077518A2 (es) * 1993-11-22 1995-11-16 Erbalaser S A Electrodo para la aplicacion de diatermia.
US5468938A (en) * 1989-09-18 1995-11-21 Roy; Stephen Microwave radiation insert exterminator
US5968401A (en) * 1989-09-18 1999-10-19 Roy; Stephen Microwave radiation insect exterminator
US20090193761A1 (en) * 2006-02-08 2009-08-06 Hasselbach John C Low Profile Packaging Assembly For Loose Fill Insulation Material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371226A1 (fr) * 1976-11-17 1978-06-16 Olivier Jean Applicateur pour soumettre une matiere a des ondes
JPS5438380U (enrdf_load_stackoverflow) * 1977-08-22 1979-03-13

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618735A (en) * 1947-01-11 1952-11-18 Raytheon Mfg Co Heating apparatus
US2888543A (en) * 1953-11-12 1959-05-26 Raytheon Mfg Co Electronic heating apparatus
US3745291A (en) * 1972-02-18 1973-07-10 Raytheon Co Microwave heating applicator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814708A (en) * 1952-01-05 1957-11-26 Raytheon Mfg Co Microwave ovens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618735A (en) * 1947-01-11 1952-11-18 Raytheon Mfg Co Heating apparatus
US2888543A (en) * 1953-11-12 1959-05-26 Raytheon Mfg Co Electronic heating apparatus
US3745291A (en) * 1972-02-18 1973-07-10 Raytheon Co Microwave heating applicator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210915A (en) * 1977-10-05 1980-07-01 Endress U. Hauser Gmbh U. Co. Microwave antenna with exponentially expanding horn structure
US4414453A (en) * 1978-12-21 1983-11-08 Raytheon Company Microwave oven feed apparatus
US4431888A (en) * 1978-12-21 1984-02-14 Amana Refrigeration, Inc. Microwave oven with improved feed structure
WO1980001461A1 (en) * 1979-01-11 1980-07-24 Bsd Medical Corp Apparatus for electromagnetic radiation of living tissue and the like
US4271848A (en) * 1979-01-11 1981-06-09 Bio Systems Design, Corp. Apparatus for electromagnetic radiation of living tissue and the like
DE3117709A1 (de) * 1980-05-05 1982-02-25 Raytheon Co., 02173 Lexington, Mass. Mikrowellenzufuehrungseinrichtung fuer mikrowellenoefen
US4350859A (en) * 1980-05-05 1982-09-21 Raytheon Company Microwave oven feed system
US4354083A (en) * 1980-11-05 1982-10-12 General Electric Company Microwave oven with novel energy distribution arrangement
US4496814A (en) * 1983-01-10 1985-01-29 General Electric Company Microwave excitation system
US5468938A (en) * 1989-09-18 1995-11-21 Roy; Stephen Microwave radiation insert exterminator
US5968401A (en) * 1989-09-18 1999-10-19 Roy; Stephen Microwave radiation insect exterminator
EP0632677A3 (en) * 1993-06-30 1995-02-22 Sanyo Electric Co Microwave oven with antenna for radiating microwaves.
US5438183A (en) * 1993-06-30 1995-08-01 Sanyo Electric Co., Ltd. Microwave oven including antenna for radiating microwave
ES2077518A2 (es) * 1993-11-22 1995-11-16 Erbalaser S A Electrodo para la aplicacion de diatermia.
US20090193761A1 (en) * 2006-02-08 2009-08-06 Hasselbach John C Low Profile Packaging Assembly For Loose Fill Insulation Material

Also Published As

Publication number Publication date
FR2230144B1 (enrdf_load_stackoverflow) 1976-11-26
CA961931A (en) 1975-01-28
JPS5019039A (enrdf_load_stackoverflow) 1975-02-28
FR2230144A1 (enrdf_load_stackoverflow) 1974-12-13
GB1454079A (en) 1976-10-27
DE2402693B2 (de) 1976-05-06
DE2402693A1 (de) 1974-11-28

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