GB1031529A - Improvements in or relating to microwave ovens - Google Patents

Improvements in or relating to microwave ovens

Info

Publication number
GB1031529A
GB1031529A GB12116/63A GB1211663A GB1031529A GB 1031529 A GB1031529 A GB 1031529A GB 12116/63 A GB12116/63 A GB 12116/63A GB 1211663 A GB1211663 A GB 1211663A GB 1031529 A GB1031529 A GB 1031529A
Authority
GB
United Kingdom
Prior art keywords
section
magnetron
waveguide
waves
ferrite rod
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
Application number
GB12116/63A
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Publication of GB1031529A publication Critical patent/GB1031529A/en
Expired legal-status Critical Current

Links

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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • 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
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

1,031,529. R.F. couplings. ELECTROLUX A.B. March 27, 1963 [March 27, 1962], No. 12116/63. Heading H4A. [Also in Division H1] In a microwave oven power is fed from a magnetron to the oven cavity via a waveguide which incorporates a Faraday rotator whereby reflected waves from the cavity are prevented from reaching the magnetron. In one feeding arrangement, Fig. 1, the waves from the magnetron are polarized as indicated at the mouth of rectangular section 2, circular section 1 encloses a ferrite rod 4 and is surrounded by a permanent magnet or a coil 5 and the polarization of the waves is rotated through 45 degrees. In an embodiment to prevent heating of the ferrite rod by oscillation in section 1 an additional and closed waveguide 8. Fig. 2, is coupled to section 1 by a slot 9, the waveguide 8 containing a wave absorber. The distance from the L.H. end of section 1 to the centre of slot 9 is made an integral number of half-wavelengths. In an alternative embodiment a wave-absorbing sheet of metal covered with a layer of graphite is placed on the centreline on either side of the ferrite rod, Fig. 3. The current to the magnetizing coil comprises an adjustable portion and at least part of the anode current of the magnetron; the same heating time for the same kind of food, independent of main voltage variation, is thereby achieved.
GB12116/63A 1962-03-27 1963-03-27 Improvements in or relating to microwave ovens Expired GB1031529A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE336462 1962-03-27

Publications (1)

Publication Number Publication Date
GB1031529A true GB1031529A (en) 1966-06-02

Family

ID=20261965

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12116/63A Expired GB1031529A (en) 1962-03-27 1963-03-27 Improvements in or relating to microwave ovens

Country Status (3)

Country Link
US (1) US3210513A (en)
DE (1) DE1440937A1 (en)
GB (1) GB1031529A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092358A (en) * 1968-09-03 1978-05-30 Snamprogetti S.P.A. Process for the production of urea having a low carbamate content

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1433425A (en) * 1965-02-12 1966-04-01 Commissariat Energie Atomique Microwave generator creating intense fields
US3437777A (en) * 1966-06-17 1969-04-08 Tokyo Shibaura Electric Co Microwave heating apparatus
GB1185363A (en) * 1967-06-06 1970-03-25 Molins Machine Co Ltd Improvements relating to Microwave Heating Devices.
FR2335470A2 (en) * 1975-08-26 1977-07-15 Automatisme & Technique PROCESS AND INSTALLATION FOR SINTING CERAMIC PRODUCTS
FR2658376B1 (en) * 1990-02-09 1996-08-14 Thomson Electromenager Sa MICROWAVE OVEN WITH ADJUSTABLE PROCESSING POWER.
US8922969B2 (en) * 2009-12-03 2014-12-30 Goji Limited Ferrite-induced spatial modification of EM field patterns

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB664926A (en) * 1949-03-09 1952-01-16 British Thomson Houston Co Ltd Improvements relating to ultra high frequency heating
US2760166A (en) * 1951-12-27 1956-08-21 Bell Telephone Labor Inc Directional phase shifter
US2827537A (en) * 1953-11-12 1958-03-18 Raytheon Mfg Co Electronic heating apparatus
US2981903A (en) * 1954-02-26 1961-04-25 Bell Telephone Labor Inc Gyromagnetic wave transmission devices
US2813185A (en) * 1954-03-08 1957-11-12 Raytheon Mfg Co Heating devices
US2954535A (en) * 1954-03-09 1960-09-27 Bell Telephone Labor Inc Non-reciprocal wave transmission
US2790054A (en) * 1954-11-12 1957-04-23 Raytheon Mfg Co Mode-shifting devices
US2929905A (en) * 1958-05-28 1960-03-22 Gen Electric Electronic cooking apparatus
US2956144A (en) * 1958-12-22 1960-10-11 Westinghouse Electric Corp Electronic ovens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092358A (en) * 1968-09-03 1978-05-30 Snamprogetti S.P.A. Process for the production of urea having a low carbamate content

Also Published As

Publication number Publication date
DE1440937A1 (en) 1968-11-28
US3210513A (en) 1965-10-05

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