US3517152A - Microwave oven field alteration - Google Patents
Microwave oven field alteration Download PDFInfo
- Publication number
- US3517152A US3517152A US767215A US3517152DA US3517152A US 3517152 A US3517152 A US 3517152A US 767215 A US767215 A US 767215A US 3517152D A US3517152D A US 3517152DA US 3517152 A US3517152 A US 3517152A
- Authority
- US
- United States
- Prior art keywords
- microwave oven
- field alteration
- cavity
- oven field
- alteration
- 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
Links
Images
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
- H05B6/74—Mode transformers or mode stirrers
Definitions
- the present invention relates in general to microwave oven field alteration and more particularly concerns a novel stirrer that is effective electrically and simple structurally.
- An embodiment of the invention exhibits greatly improved performance, especially when thawing and cooking raw meat, for reasons not fully understood.
- a rectangular conductive sheet is spaced roughly one or an odd number of quarter wavelength from one wall of the microwave oven cavity. Means are provided for rotating the conductive sheet roughly about its center.
- a microwave oven 11 having a rectangular stirrer 12 suspended from a shaft 13 rotatably supported in the upper wall 14 of the microwave oven cavity so that the distance between rectangular conducting plate 12 and upper wall 14 is substantially a quarter wavelength at the frequency of the microwave energy introduced into the oven to perform the heating.
- the specific details of the means for rotatably supporting and rotating shaft 13 are well known in the art and not shown in the figure so as not to obscure the principles of the invention.
- dimensions used successfully in a 12" X 12" x 7 /2" cavity have included sheets 6%" X 6%" and 4 /2" x 4%", and A thick corresponding to a perimeter of said conducting sheet being in the order of one third to one half the perimeter about said cavity defining walls with an operating frequency of 2450 mHz. :25 mHz. It was discovered that the larger sheet may have had a slightly more uinform cooking pattern; however, the smaller one gave a better R-F impedance match to the magnetron tube source.
- field alteration means comprising a rectangular conducting sheet substantially an odd number of quarter wavelengths from one of the walls defining the cavity
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US76721568A | 1968-10-14 | 1968-10-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3517152A true US3517152A (en) | 1970-06-23 |
Family
ID=25078833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US767215A Expired - Lifetime US3517152A (en) | 1968-10-14 | 1968-10-14 | Microwave oven field alteration |
Country Status (1)
Country | Link |
---|---|
US (1) | US3517152A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798404A (en) * | 1972-12-21 | 1974-03-19 | Gen Electric | Electronic oven with mode exciter |
US4185182A (en) * | 1978-07-03 | 1980-01-22 | Armstrong Cork Company | Microwave oven apparatus |
US6590191B2 (en) * | 1999-07-12 | 2003-07-08 | Industrial Microwaves Systems, Inc. | Method and apparatus for electromagnetic exposure of planar or other materials |
US20050230385A1 (en) * | 2004-02-19 | 2005-10-20 | Lg Electronics Inc. | Microwave oven |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2920174A (en) * | 1957-06-28 | 1960-01-05 | Raytheon Co | Microwave ovens |
US3364332A (en) * | 1964-03-20 | 1968-01-16 | Philips Corp | Arrangement in microwave stoves |
-
1968
- 1968-10-14 US US767215A patent/US3517152A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2920174A (en) * | 1957-06-28 | 1960-01-05 | Raytheon Co | Microwave ovens |
US3364332A (en) * | 1964-03-20 | 1968-01-16 | Philips Corp | Arrangement in microwave stoves |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798404A (en) * | 1972-12-21 | 1974-03-19 | Gen Electric | Electronic oven with mode exciter |
US4185182A (en) * | 1978-07-03 | 1980-01-22 | Armstrong Cork Company | Microwave oven apparatus |
US6590191B2 (en) * | 1999-07-12 | 2003-07-08 | Industrial Microwaves Systems, Inc. | Method and apparatus for electromagnetic exposure of planar or other materials |
US20050230385A1 (en) * | 2004-02-19 | 2005-10-20 | Lg Electronics Inc. | Microwave oven |
US7030347B2 (en) * | 2004-02-19 | 2006-04-18 | Lg Electronics Inc. | Microwave oven with mode stirrer |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MICRO-QUARTZ TECHNOLOGY CORPORATION, A CORP. OF MN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MICRO-TRONICS, LTD. A CORP. F MN.;REEL/FRAME:004004/0072 Effective date: 19820603 Owner name: MICRO-QUARTZ TECHNOLOGY CORPORATION, 1010 LYNDALE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO-TRONICS, LTD. A CORP. F MN.;REEL/FRAME:004004/0072 Effective date: 19820603 |
|
AS | Assignment |
Owner name: MICRO-QUARTZ TECHNOLOGY CORPORATION 1010 LYNDALE A Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO-TRONICS, LTD., INC. A MN CORP.;REEL/FRAME:004024/0290 Effective date: 19820714 Owner name: MICRO-TRONICS, LTD., INC., 1010 LYNDALE AVE. NORTH Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO-TRONICS, INC. A WI CORP.;REEL/FRAME:004024/0294 Effective date: 19820603 |