EP0949848A1 - Microvawe oven having arcuate concave portions in a cavity for distributing microwaves - Google Patents
Microvawe oven having arcuate concave portions in a cavity for distributing microwaves Download PDFInfo
- Publication number
- EP0949848A1 EP0949848A1 EP98106683A EP98106683A EP0949848A1 EP 0949848 A1 EP0949848 A1 EP 0949848A1 EP 98106683 A EP98106683 A EP 98106683A EP 98106683 A EP98106683 A EP 98106683A EP 0949848 A1 EP0949848 A1 EP 0949848A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microwave
- arcuate concave
- side wall
- microwave oven
- center
- 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.)
- Granted
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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
- H05B6/70—Feed lines
- H05B6/704—Feed lines using microwave polarisers
-
- 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
- H05B6/6426—Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord
-
- 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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Electric Ovens (AREA)
Abstract
Description
- The present invention relates to a microwave oven, and more particularly to a microwave oven which can uniformly distribute microwaves in vertical and horizontal directions within a cavity, thereby effectively heating foodstuffs.
- As is well known, a microwave oven is an appliance for heating foodstuffs by passing microwaves through the foodstuffs. Generally, the microwave oven has a magnetron which generates the microwaves when a high-voltage is applied thereto. In the microwave oven, the magnetron generates the microwaves having a frequency of approximately 2,450 MHz. When the high frequency microwaves are radiated to the foodstuffs contained in a cooking cavity, particles of the foodstuffs are rapidly moved so that a frictional heat is generated from a friction between the particles. The microwave oven heats the foodstuffs by using the frictional heat.
- Such microwaves are generated when a high-voltage produced by primary and secondary induction coils of a transformer disposed at a lower wall of a cabinet is applied to the magnetron, and the microwaves are radiated into the cooking cavity through a wave guide.
- FIG. 11 shows a
conventional microwave oven 400. - As shown in FIG. 11,
conventional microwave oven 400 has acabinet 430.Cabinet 430 includes acooking cavity 410 and acontrol chamber 420 which are separated from each other by apartition 415. - A
wave guide 450 which guides high frequency microwaves generated from amagnetron 440 intocooking cavity 410 is attached to a predetermined position onpartition 415. Magnetron 440 is coupled to a side ofwave guide 450. In order to radiate the high frequency microwaves intocooking cavity 410, anaperture 452 is formed at a predetermined position inpartition 415. In addition, anantenna 442 for sending the high frequency microwaves is integrally formed at a side ofmagnetron 440. - A
transformer 460 for generating a high voltage is mounted on a lower wall ofcontrol chamber 420. Transformer 460 is connected tomagnetron 440 so as to apply the high-voltage tomagnetron 440. - A
cooking tray 480, on which the foodstuffs to be heated are placed, is provided incooking cavity 410. In order to uniformly heat the foodstuffs,cooking tray 480 is coupled to ashaft 472 of amotor 470, and is rotated while the foodstuffs are being heated. -
Microwave oven 400 having the above described structure operates as follows. - Firstly, when a user turns on an operating switch (not shown) attached to a front of
cabinet 430, a microcomputer (not shown) installed inmicrowave oven 400 sends an operating signal to transformer 460. As a result,transformer 460 generates the high voltage and transfers the high voltage tomagnetron 440 so that the high frequency microwaves are generated bymagnetron 440. The high frequency microwaves are radiated intocooking cavity 410 throughantenna 442,wave guide 450, andaperture 452 so the foodstuffs placed oncooking tray 480 are heated. - At the same time, the microcomputer sends an operating signal to motor 470 so as to rotate
cooking tray 480 while the foodstuffs are being heated. - However,
conventional microwave oven 400 having the above mentioned structure has a disadvantage in that the microwaves are not uniformly distributed incooking cavity 410, so the microwaves penetrate into the foodstuffs to be heated to a limited depth. For this reason, when a large amount of the foodstuffs are placed oncooking tray 480, the microwaves do not reach a portion of the foodstuffs, so the foodstuffs are not uniformly heated. - In order to solve the above problem, a microwave oven which has a means for stirring the foodstuffs contained in a receptacle, thereby causing all of the foodstuffs to be subjected to the microwaves, has been proposed.
- However, the microwave oven requires a sufficient stirring of the foodstuffs in order to uniformly heat the foodstuffs. Moreover, such stirring is difficult when the foodstuffs to be heated are fragile.
- On the other hand, U.S. patent No. 4,937,418 issued to Boulard discloses a microwave oven which distributes the temperature inside the cooking cavity uniformly while minimizing the stirring of the foodstuffs.
- Boulard's microwave oven has a wave spreader including a wave guide. The wave guide has at least one wave-receiving opening formed at an upper portion thereof and at least one wave-diffusing opening formed at a lower portion thereof. First and second deflectors for deflecting microwaves are provided in the wave guide.
- However, Boulard's wave spreader is provided as a separate device and installed in the cooking cavity, so the useable volume of the cooking cavity is reduced.
- In addition, U.S. patent No. 5,698,128 issued to Sakai discloses a microwave oven in which projections are formed in the cooking cavity. In the Sakai's microwave oven, a plurality of convex projections of different sizes are formed in the cooking cavity so as to uniformly distribute the microwaves radiated into the cooking cavity. But, forming the projections in the cooking cavity is difficult and the microwaves are not properly distributed in the cooking cavity if the convex projections are insufficiently provided in the cooking cavity.
- The present invention has been made to solve the problems of the prior arts, and accordingly, it is an object of the present invention to provide a microwave oven which can uniformly distribute microwaves in horizontal and vertical directions within a cooking cavity, and which can be easily manufactured with simple structure.
- To accomplish the above object of the present invention, there is provided a microwave oven comprising a cabinet having a cooking cavity for receiving a foodstuffs to be heated and a control chamber separated from the cooking cavity by a partition; a door installed at a front of the cabinet for opening/closing the cooking cavity; a magnetron installed at the control chamber for generating a microwave; and a wave guide for guiding the microwave generated by the magnetron into the cooking cavity, wherein the cooking cavity is defined by an upper wall, a bottom wall, a first side wall to which the wave guide is attached, a second side wall positioned opposite to the first side wall, the door, and a third side wall positioned opposite to the door, the first side wall being formed with a microwave outlet, the second and third side walls being formed with at least one concave portion for distributing the microwave.
- According to a preferred embodiment of the present invention, the second and third side walls are formed with two arcuate concave portions, respectively, which are spaced by a predetermined distance apart from each other. Each concave portion has a diameter larger than a half wavelength of the microwave. A distance between a center of the arcuate concave portion formed at the second side wall and the bottom wall is larger than a half wavelength of the microwave. Each concave portion has a depth in a range of 3 to 24mm.
- When viewed from the top, a center between two arcuate concave portions formed at the second side wall is in line with or is offset by a predetermined distance from a center of the microwave outlet.
- The above object and other advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings, in which:
- FIG. 1 is a cross-sectional view of a microwave oven according to a preferred embodiment of the present invention;
- FIG. 2 is a sectional view taken along line M-N shown in FIG. 1;
- FIG. 3 is a plan view showing samples arranged for testing a temperature deviation in a horizontal direction;
- FIG. 4 is a graph showing a horizontal temperature deviation of the samples tested by a conventional microwave oven;
- FIG. 5 is a graph showing a horizontal temperature deviation of the samples tested by a microwave oven of the present invention;
- FIG. 6 is a front view showing a sample for testing a temperature deviation in a vertical direction thereof;
- FIG. 7 is a graph showing a vertical temperature distribution of the sample tested by a conventional microwave oven;
- FIG. 8 is a graph showing a vertical temperature distribution of the sample tested by a microwave oven of the present invention;
- FIG. 9 is a cross-sectional view showing a concave portion for distributing microwaves according to a second embodiment of the present invention;
- FIG. 10 is a cross-sectional view showing a concave portion for distributing microwaves according to a third embodiment of the present invention; and
- FIG. 11 is a cross-sectional view of a conventional microwave oven.
-
- Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
- FIG. 1 shows a
microwave oven 100 according to the preferred embodiment of the present invention. - As shown in FIG. 1,
microwave oven 100 has acabinet 130.Cabinet 130 includes acooking cavity 110 and acontrol chamber 120 which are separated from each other by afirst side wall 115.Cooking cavity 110 is defined by anupper wall 111, abottom wall 112, a door 116 (shown in FIG. 2) installed at a front ofmicrowave oven 100, afirst side wall 115, asecond side wall 117 positioned opposite tofirst side wall 115, and athird side wall 118 positioned opposite todoor 116. - A
wave guide 150 which guides a microwave generated from amagnetron 140 intocooking cavity 110 is attached to a rear side offirst side wall 115.First side wall 115 is formed at its predetermined position corresponding towave guide 150 with amicrowave outlet 152 so as to allow the microwave to be radiated intocooking cavity 110. Magnetron 140 is assembled to one side ofwave guide 150. Anantenna 142 for transmitting the microwave towave guide 150 is integrally formed withmagnetron 140. - A
transformer 160 for generating a high-voltage is mounted on a bottom wall ofcontrol chamber 120.Transformer 160 is connected tomagnetron 140 so as to apply the high-voltage tomagnetron 140. - A
cooking tray 180, on whichfoodstuffs 186 to be heated are placed, is provided incooking cavity 110. In order to uniformly heat the foodstuffs,cooking tray 180 is connected to amotor 170 through ashaft 172 and rotates while the foodstuffs are being heated. - In order to uniformly distribute the microwave radiated into
cooking cavity 110 in horizontal and vertical directions thereof,second side wall 117 is formed with at least one first arcuateconcave portion 182 andthird side wall 118 is formed with at least one second arcuateconcave portion 184. According to the preferred embodiment of the present invention, second andthird side walls - If two arcuate concave portions are formed at
second side wall 117, a distance between two arcuate concave portions is formed in the range of a quarter wavelength to a half wavelength of the microwave. - Preferably, each arcuate concave portion has a diameter D larger than a half wavelength of the microwave. More preferably, the diameter of the arcuate concave portion is in the range of 70 to 100mm. Within this range, first and second arcuate
concave portions - A distance L between a center C of each arcuate
concave portion 182 formed atsecond side wall 117 and the bottom wall is larger than a half wavelength of the microwave. According to the preferred embodiment of the present invention, distance L is larger than 60mm. Also, a depth d of the arcuate concave portion is in a range of 3 to 24mm. Within this range, first and second arcuate concave portions can have different depths from each other. - When viewed from the top, a center C between two arcuate
concave portions 182 formed atsecond side wall 117 is in line with or is offset by a predetermined distance from a center ofmicrowave outlet 152. If center C between two arcuateconcave portions 182 is offset from the center ofmicrowave outlet 152, an offset distance ℓ is shorter than an eighth wavelength of the microwave. That is, when viewed from the top, center C between two arcuateconcave portions 182 formed atsecond side wall 117 is offset less than 15mm from the center ofmicrowave outlet 152. - In addition, a distance between a lower end of
microwave outlet 152 andbottom wall 112 ofcavity 110 is larger than a half wavelength of the microwave. - FIG. 9 shows an arcuate
concave portion 282 according to another embodiment of the present invention. According to this embodiment, arcuateconcave portion 282 is formed at a front edge thereof with arim portion 284 having a diameter identical to the diameter of arcuateconcave portion 282. In this case, forming arcuateconcave portion 282 at a side wall of cookingcavity 110 is easily attained. Preferably, a width t ofrim portion 284 is larger than 1mm. - FIG. 10 shows an arcuate
concave portion 382 according to still another embodiment of the present invention. Arcuateconcave portion 382 is formed at a front edge thereof with arim portion 384 having a diameter larger than the diameter of arcuateconcave portion 382. In this case, a radius ofrim portion 384 is larger than the diameter of arcuateconcave portion 382 by approximately 1mm and a width t thereof is larger than 1mm. -
Microwave oven 100 having the above mentioned structure operates as follows. - Firstly, when the user turns on an operating switch (not shown) attached to a front portion of
cabinet 130, a microcomputer (not shown) installed inmicrowave oven 100 sends an operating signal totransformer 160. Upon receiving the operating signal,transformer 160 generates a high voltage and transmits the high voltage tomagnetron 140 so that the high-frequency microwaves are generated bymagnetron 140. The high-frequency microwaves are radiated intocooking cavity 110 throughantenna 142,wave guide 150 andmicrowave outlet 152. - As shown in FIGs. 1 and 2 in detail, when the microwaves radiated into
cooking cavity 110 make contact with arcuateconcave portions third side walls foodstuffs 186 placed oncooking tray 180, thereby effectively heatingfoodstuffs 186. - In order to allow the microwaves to uniformly penetrate
foodstuffs 186 in vertical and horizontal directions, not only must the deflected microwaves be properly guided intofoodstuffs 186, but also hot spots, which are created when the deflected microwaves cross the radiated microwaves, must be uniformly created in the vertical and horizontal directions. - For that purpose, positions, shapes and sizes of arcuate
concave portions cooking cavity 110 and found optimal positions, shapes and sizes of arcuateconcave portions cooking cavity 110 by forming arcuateconcave portions - The experimental results are as follows. To estimate deviations of horizontal temperature distribution in the cooking cavity,
test samples 1 to 5 were arranged on the cooking tray as shown in FIG. 3. Beakers having water therein were used as test samples. Tables 1 and 2 show the results tested by a conventional microwave oven and the microwave oven of the present invention, respectively.Result tested by the conventional microwave oven. Temp.\Samples 1 2 3 4 5 T1 17.9 18.2 18.3 18.2 18.2 T2 54.1 56.8 58.8 63.6 60.8 ΔT 36.2 38.6 40.5 45.4 42.6 ΔTmax -ΔTmin 9.2 Result tested by the microwave oven of the present invention. Temp.\Samples 1 2 3 4 5 T1 16.7 16.8 16.9 16.9 16.7 T2 57.2 55.5 60.1 60.1 56.0 ΔT 40.5 38.7 43.2 43.2 39.3 ΔTmax -ΔTmin 4.5 - FIGs. 4 and 5 are graphs showing the above results. As is understood from FIGs. 4 and 5, in the conventional microwave oven, a temperature difference w between a
sample 1 having minimum ΔT and asample 4 having maximum ΔT was 9.2°. On the other hand, in the microwave oven of the present invention, the temperature difference w between asample 2 having minimum ΔT and asample 4 having maximum ΔT was 4.5°. Accordingly, it is understood that the microwave oven of the present invention can uniformly heat the foodstuffs horizontally. - In addition, in order to test vertical temperature deviations in the cooking cavity, a bottle having a milk therein, as shown in FIG. 6, was used as a test sample. Tables 3 and 4 show the results tested by a conventional microwave oven and the microwave oven of the present invention, respectively.
Result tested by the conventional microwave oven. Position\time(sec) 0 20 40 60 80 100 120 140 160 180 upper 19.1 22.9 27.9 31.9 35.7 39.4 42.3 45.6 46.9 49.3 middle 19.0 24.7 30.0 34.5 39.7 44.2 48.7 51.8 54.1 57.7 lower 19.2 28.9 37.5 45.3 54.4 61.2 70.9 78.4 85.8 93.6 Result tested by the microwave oven of the present invention. Position\time(sec) 0 20 40 60 80 100 120 140 160 180 upper 16.4 20.5 24.2 28.3 32.3 35.7 38.2 40.7 43.5 44.4 center 17.0 24.0 30.8 37.3 43.5 48.5 51.9 55.6 59.4 62.4 lower 17.4 26.9 34.7 42.6 50.9 58.2 64.5 73.2 81.7 89.7 - FIGs. 7 and 8 are graphs showing the above results. In the conventional microwave oven, a temperature difference w1 between upper and middle portions of the milk bottle was larger than a temperature difference w2 between middle and lower portions of the milk bottle. In contrast, in the microwave oven of the present invention, temperature difference w1 between upper and middle portions of the milk bottle is similar to temperature difference w2 between middle and lower portions of the milk bottle. Accordingly, it is understood that the microwave oven of the present invention can uniformly heat the foodstuffs vertically.
- The above results have been obtained through many experiments and water, pizza, milk and the like were used as samples. As a result, the foodstuffs are uniformly and effectively heated and taste good.
- As described above, the microwave oven according to the present invention can uniformly penetrate the microwaves through the foodstuffs in vertical and horizontal directions thereof so that the heating efficiency to the foodstuffs is improved and the heating time thereof is reduced.
- Further, since the arcuate concave portions have simple shapes, manufacturing work thereof is easy and the manufacturing cost thereof is reduced.
- Although the preferred embodiment of the invention has been described, it will be understood by those skilled in the art that the present invention should not be limited to the described preferred embodiment, but various changes and modifications can be made within the scope of the invention as defined by the appended claims.
Claims (16)
- A microwave oven including a cabinet having a cooking cavity for receiving foodstuffs to be heated and a control chamber separated from the cooking cavity by a partition, a door installed at a front of the cabinet for opening/closing the cooking cavity, a magnetron installed at the control chamber for generating a microwave, and a wave guide for guiding the microwave generated by the magnetron into the cooking cavity, characterized in that the cooking cavity is defined by an upper wall, a bottom wall, a first side wall at which the wave guide is attached, a second side wall positioned opposite to the first side wall, the door, and a third side wall positioned opposite to the door, the first side wall being formed with a microwave outlet, the second and third side walls being formed with at least one arcuate concave portion for distributing the microwave.
- The microwave oven as claimed in claim 1, characterized in that the second and third side walls are formed with two arcuate concave portions respectively, the arcuate concave portions being spaced apart from each other by a predetermined distance.
- The microwave oven as claimed in claims 1 or 2, characterized in that each arcuate concave portion has a diameter larger than a half wavelength of the microwave.
- The microwave oven as claimed in any one of claims 1 to 3, characterized in that a diameter of each concave porion is in a range of 30 to 100mm.
- The microwave oven as claimed in any one of claims 1 to 4, characterized in that a distance between a center of each arcuate concave portion formed at the second side wall and the bottom wall is larger than a half wavelength of the microwave.
- The microwave oven as claimed in any one of claims 1 to 4, characterized in that a distance between a center of each arcuate concave portion formed at the second side wall and the bottom wall is larger than 60mm.
- The microwave oven as claimed in any one of claims 1 to 6, characterized in that each arcuate concave portion has a depth in a range of 3 to 24mm.
- The microwave oven as claimed in any one of claims 1 to 7, characterized in that, when viewed from a top, a first center between two arcuate concave portions formed at the second side wall is in line with a second center of the microwave outlet.
- The microwave oven as claimed in any one of claims 1 to 7, characterized in that when viewed from a top, a first center between two arcuate concave portions formed at the second side wall is offset from a second center of the microwave outlet less than an eighth wavelength of the microwave.
- The microwave oven as claimed in any one of claims 1 to 7, characterized in that when viewed from a top, a first center between two arcuate concave portions formed at the second side wall is offset from a second center of the microwave outlet by less than 15mm.
- The microwave oven as claimed in any one of claims 1 to 10, characterized in that a rim portion having a depth larger than 1mm is formed at a front edge of each arcuate concave portion.
- The microwave oven as claimed in claim 2, characterized in that a distance between two arcuate concave portions formed at the second side wall is in a range of a quarter wavelength to a half wavelength of the microwave.
- The microwave oven as claimed in any one of claims 1 to 12, characterized in that a distance between a lower end of the microwave outlet and the bottom wall of the cavity is larger than a half wavelength of the microwave.
- The microwave oven as claimed in claim 2, characterized in that each arcuate concave portion has a diameter larger than a half wavelength of the microwave, a distance between a first center of each arcuate concave portion formed at the second side wall and the bottom wall is larger than a half wavelength of the microwave, each arcuate concave portion has a depth in a range of 3 to 24mm, and when viewed from a top, a second center between two arcuate concave portions formed at the second side wall is in line with a third center of the microwave outlet.
- The microwave oven as claimed in claim 2, characterized in that a diameter of each concave porion is in a range of 30 to 100mm, a first distance between a first center of each arcuate concave portion formed at the second side wall and the bottom wall is larger than 60mm, each arcuate concave portion has a depth in a range of 3 to 24mm, and, when viewed from a top, a second center between two arcuate concave portions formed at the second side wall is offset from a third center of the microwave outlet by less than 15mm.
- The microwave oven as claimed in claim 15, characterized in that a second distance between two arcuate concave portions formed at the second side wall is in a range of a quarter wavelength to a half wavelength of the microwave, and a third distance between a lower end of the microwave outlet and the bottom wall of the cavity larger than a half wavelength of the microwave.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998632588 DE69832588T2 (en) | 1998-04-11 | 1998-04-11 | Microwave oven with circular concave portions in a cavity for distributing the microwaves |
EP19980106683 EP0949848B1 (en) | 1998-04-11 | 1998-04-11 | Microvawe oven having arcuate concave portions in a cavity for distributing microwaves |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19980106683 EP0949848B1 (en) | 1998-04-11 | 1998-04-11 | Microvawe oven having arcuate concave portions in a cavity for distributing microwaves |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0949848A1 true EP0949848A1 (en) | 1999-10-13 |
EP0949848B1 EP0949848B1 (en) | 2005-11-30 |
Family
ID=8231754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980106683 Expired - Lifetime EP0949848B1 (en) | 1998-04-11 | 1998-04-11 | Microvawe oven having arcuate concave portions in a cavity for distributing microwaves |
Country Status (2)
Country | Link |
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EP (1) | EP0949848B1 (en) |
DE (1) | DE69832588T2 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH369836A (en) * | 1959-07-15 | 1963-06-15 | Therma Ag | Device for heating materials using high frequency energy |
DE1515156A1 (en) * | 1964-07-03 | 1969-07-03 | Siemens Elektrogeraete Gmbh | Cooking chamber of an HF radiation cooker |
US3461260A (en) * | 1966-05-16 | 1969-08-12 | Gen Motors Corp | Microwave oven |
EP0274164A1 (en) * | 1987-01-08 | 1988-07-13 | Philips Norden AB | A microwave oven |
JPH06196257A (en) * | 1992-12-24 | 1994-07-15 | Hitachi Ltd | Microwave oven |
DE4313806A1 (en) * | 1993-04-27 | 1994-11-03 | Rene Salina | Device for heating materials in a heating chamber which can be irradiated with microwaves, and method for producing ceramic products, in which the raw product (unfinished product) is dried by means of microwaves |
JPH08213166A (en) * | 1995-02-09 | 1996-08-20 | Tiger Vacuum Bottle Co Ltd | High-frequency heating device |
-
1998
- 1998-04-11 DE DE1998632588 patent/DE69832588T2/en not_active Expired - Lifetime
- 1998-04-11 EP EP19980106683 patent/EP0949848B1/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH369836A (en) * | 1959-07-15 | 1963-06-15 | Therma Ag | Device for heating materials using high frequency energy |
DE1515156A1 (en) * | 1964-07-03 | 1969-07-03 | Siemens Elektrogeraete Gmbh | Cooking chamber of an HF radiation cooker |
US3461260A (en) * | 1966-05-16 | 1969-08-12 | Gen Motors Corp | Microwave oven |
EP0274164A1 (en) * | 1987-01-08 | 1988-07-13 | Philips Norden AB | A microwave oven |
JPH06196257A (en) * | 1992-12-24 | 1994-07-15 | Hitachi Ltd | Microwave oven |
DE4313806A1 (en) * | 1993-04-27 | 1994-11-03 | Rene Salina | Device for heating materials in a heating chamber which can be irradiated with microwaves, and method for producing ceramic products, in which the raw product (unfinished product) is dried by means of microwaves |
JPH08213166A (en) * | 1995-02-09 | 1996-08-20 | Tiger Vacuum Bottle Co Ltd | High-frequency heating device |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 018, no. 540 (E - 1616) 14 October 1994 (1994-10-14) * |
PATENT ABSTRACTS OF JAPAN vol. 096, no. 012 26 December 1996 (1996-12-26) * |
Also Published As
Publication number | Publication date |
---|---|
EP0949848B1 (en) | 2005-11-30 |
DE69832588D1 (en) | 2006-01-05 |
DE69832588T2 (en) | 2006-08-10 |
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