WO2008084668A1 - Four à micro-ondes - Google Patents

Four à micro-ondes Download PDF

Info

Publication number
WO2008084668A1
WO2008084668A1 PCT/JP2007/074775 JP2007074775W WO2008084668A1 WO 2008084668 A1 WO2008084668 A1 WO 2008084668A1 JP 2007074775 W JP2007074775 W JP 2007074775W WO 2008084668 A1 WO2008084668 A1 WO 2008084668A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
heating
microwave oven
cooking
rotatable
Prior art date
Application number
PCT/JP2007/074775
Other languages
English (en)
Inventor
Masaaki Sano
Nobuhiro Ogawa
Original Assignee
Panasonic Corporation
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 Panasonic Corporation filed Critical Panasonic Corporation
Publication of WO2008084668A1 publication Critical patent/WO2008084668A1/fr

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
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas

Definitions

  • the present invention relates to a microwave oven which heats an object by induction heating.
  • An electronic range which a typical microwave oven, is able to directly heat food, which is a typical object for heating, without a need to prepare a pan or a pot, making it a convenient and indispensable appliance for everyday life.
  • An electronic range has a space which is of a size that will accommodate food in a heating chamber for propagating microwaves, such that the dimensions of width and depth are about 300-400 mm, and the dimension of height is about 200 mm.
  • the bottom surface of the space for accommodating food is made flat, and the width is 400 mm or more, and thus larger than the depth, thereby making it possible to arrange a plurality of food dishes for heating so as to increase convenience, and such products with larger heating chambers have been commercialized.
  • the wavelength of microwaves used in electronic ranges is about 120 mm, and it is known that an uneven distribution of field strength (hereinafter referred to as a radio wave distribution) occurs within a heating chamber, and that uneven heating occurs due to the synergetic effects imparted by the shape and physical properties of the heated object.
  • a radio wave distribution an uneven distribution of field strength
  • such a microwave heating device had a single radiating antenna driven for rotation, or a plurality of high-frequency stirring means to increase the uniformity of heating, or a plurality of high-frequency wave stirring means (see, for example, Patent Reference 1).
  • Patent Reference 1 and Patent Reference 2 disclose an example of radiating antennas a unipole antenna in which a coupling part of a waveguide also functions as a rotational axis and causes microwaves concentrate at the tip in the longitudinal direction extended in one direction from the coupling part.
  • FIG. 7 (a) has rotary antennas 1 and 2, and radiating members 5 and 6 which extend in one direction from coupling parts 3 and 4, respectively, thus having a configuration similar to a unipole antenna.
  • FIG. 7 (a) has rotary antennas 1 and 2, and radiating members 5 and 6 which extend in one direction from coupling parts 3 and 4, respectively, thus having a configuration similar to a unipole antenna.
  • FIG. 7 (a) has rotary antennas 1 and 2, and radiating members 5 and 6 which extend in one direction from coupling parts 3 and 4, respectively, thus having a configuration similar to a unipole antenna.
  • FIG. 7 (a) has rotary antennas 1 and 2, and radiating members 5 and 6 which extend in one direction from coupling parts 3 and 4, respectively
  • FIG. 7 (b) shows an image wherein microwaves concentrate on a shaded portion 7 when rotary antennas 1 and 2 both face each other toward the inner side.
  • FIG. 7 (c) shows an image wherein microwave fields concentrate on shaded portions 8 and 9, respectively, when the rotary antennas 1 and 2 are oriented in different directions.
  • a radiating antenna is one which has a fan-shaped configuration (see, for example, Patent Reference 3).
  • Patent Reference 3 discloses an example in which the heating distribution can be varied for the chamber as a whole, according to the angle at which a radiating antenna is stopped. The correspondence between the stopping position of the radiating antenna and the heating distribution is determined in advance by experiment, and can be selected as needed.
  • a microwave heating device with a wide heating chamber having a practical structure which can typically uniformly heat the entire chamber, and can also concentrate heating locally (a simple configuration with few parts and low cost, and in particular, a structure with good safety and in which it is easy to switch between uniform heating of the entire chamber and localized concentrated heating) - (see Patent Reference 5).
  • Patent Reference 1 Japanese Patent Application Kokai Publication No.
  • Patent Reference 2 Japanese Patent No. 3617224 Patent Reference 3: Japanese Patent Application Kokai Publication No.
  • Patent Reference 4 Japanese Patent Application Kokai Publication No.
  • Patent Reference 5 Japanese Patent Application Kokai Publication No. 2006-286443
  • Patent Reference 1 and Patent Reference 2 it appears at first that if a heating chamber is wide, it should be possible to uniformly heat an entire chamber if a plurality of radiating antennas are arrayed on the right and on the left. Furthermore, heating can be concentrated locally, for example, by concentrating to some extent toward the tip of a unipole antenna by stopping the radiating antenna.
  • FIG. 23 of Patent Reference 2 shows characteristic a at position x on the horizontal axis and microwave field E on the vertical axis (or change in temperature ⁇ T when there is an aqueous load spread across the entire chamber). Although it is concentrated to some extent at the tip position x 2 of radiating member 10, it is found that microwave field E is concentrated more at position X 1 directly above the coupling parts (the temperature of the aqueous load rises). If there are 2 unipole antennas 10 and 11 facing each other, as in FIG. 25 of Patent Reference 2 (FIG.
  • characteristic a black circle
  • characteristic b white circle
  • characteristic c a synthesized characteristic c.
  • microwaves are still concentrated at positions Xi and x 3 , and it cannot be the that they are concentrated only at position x 2 .
  • FIG. 31 and FIG. 32 of Patent Reference 2 [(a) shows a top view and (b) shows a side view, respectively, of FIG. 10 and FIG. 11]
  • the end sides 14, 15 of radiating members 12, 13 are bent upwards to approach the object to be heated, or ideally, as shown in FIG. 33, 34 of Patent Reference 2 [in the present invention, FIG.
  • FIG. 12 (a) is a top view, (b) is a sectional view along K-K', and (c) is a side view, and FIG. 13 is a characteristic curve] coupling part 16 is shielded with a cover 17.
  • microwaves are thoroughly concentrated at the tip position X 4 as shown by characteristic b in FIG. 13, but in this case, the antennas must be coaxial, and since coaxial core line member 18 and cover 17 are both made of metal, they must be kept at a sufficient distance from each other so that sparks do not form between them, which means increased design work such as a greater number of reliability test items so as to ensure safety.
  • the microwave transmission state changes when the distance between the two of them increases, care must be taken to maintain a constant distance between them at all times.
  • FIG. 14 (a) is a sectional view and (b) is a top view of a rotary antenna] there is a rotary antenna, rather than a unipole antenna, but it appears to be difficult to estimate the heating distribution by the orientation of radiating member 19.
  • FIG. 3 of Patent Reference 3 [in the present invention, FIG.
  • FIG. 17 of Patent Reference 4 shows examples of varying distribution due to the relative positions of radiating antenna 24 and auxiliary antenna 25, such that radiating antenna blade parts 24a, 24b, 24c, 24d are caused to face ribs 25a, 25b, 25c, 25d of auxiliary antenna 25, with a minimum gap distance of 3-5 mm, resulting in a microwave coupling as shown in FIG. 16 (a), and as shown in FIG. 16 (b), radiating antenna 24 is shifted so that blade parts 24a, 24b, 24c, 24d are not caused to face ribs 25a, 25b, 25c, 25d, so that the minimum gap distance is 10 mm, so no microwave coupling occurs.
  • Radiating antenna 24 has a structure capable of rotation, and it is anticipated that some degree of shakiness will occur with respect to the rotational axis, so it is difficult to maintain a constant distance between radiating antenna 24 and auxiliary antenna 25 at all times, and to maintain a stable coupling state. Furthermore, even if it is possible to maintain a stable coupling state and non- coupling state, respectively, there is a problem associated with switching between a coupling state and a non-coupling state.
  • Patent Reference 5 discloses a microwave heating device with a wide heating chamber which has means to resolve the aforementioned drawback, providing a microwave heating device chamber having a practical structure which can typically uniformly heat an entire chamber, and can also concentrate heating locally (a simple configuration with few parts and low cost, and in particular, a structure with good safety and in which it is easy to switch between uniform heating of the entire chamber and localized concentrated heating), but due to the stopping position after cooking is finished, time is needed to move it to the initial stopping position for the next cooking, and if heating is performed in the interim by microwaves, the distribution is not uniform, and it is thought that if the microwaves stop during the transition to the initial stopping position, the heating time is extended.
  • the drawback of Patent Reference 5 is shared with Patent References 1-4.
  • the present invention was devised with consideration given to such drawbacks of the prior art, and has as its object in particular to provide a microwave oven capable of heating uniformly without extending the heating time and capable of achieving concentrated localized heating. [0017] Accordingly, it becomes possible to prevent exceeding the cooking time while the rotary antenna is moving, by positioning the rotary antenna at a predetermined location at the beginning of cooking.
  • the microwave oven of the present invention makes it possible to prevent exceeding the cooking time while the rotatable antenna is moving, by positioning the rotatable antenna at a predetermined location at the beginning of cooking.
  • the microwave oven of the first invention comprises an electromagnetic energy source; a waveguide which conducts electromagnetic waves from the electromagnetic energy source; a heating chamber connected to the upper part of the waveguide and with a width greater than a depth; a non- rotating platform disposed within the heating chamber and upon which an object to be heated is placed; and a space accommodating an object to be heated, formed above the platform within the heating chamber.
  • the microwave oven of the first invention further comprises: an antenna space formed under the platform within the heating chamber; two rotatable radiation-directing antennas located symmetrically with respect to the width of the heating chamber across the antenna space from the waveguide, so as to discharge the electromagnetic energy from the waveguide into the heating chamber; an antenna driver capable of rotationally driving the rotatable antenna; and a controller for controlling the orientation of the antenna by controlling the antenna driver so that the rotatable antenna is stopped at a predetermined position after cooking is completed.
  • the second invention has a memory for recording the stopping positions of the rotatable antenna added to the first invention.
  • the invention makes it possible to set the rotatable antenna at a predetermined position prior to the starting time of cooking, and thereby reduce the overall cooking time including the time the rotatable antenna moves.
  • the microwave oven of the third invention is implementable particularly in the microwave oven of the first invention and configured to drive the rotatable antenna at the starting time of cooking up to the initial stopping position by a controller, in cases where the position data stored in the memory differs from the initial stopping position required for each cooking. Accordingly, in cases where an initial stopping position required for cooking is different from the stored position data, the rotatable antenna is rotated to the required position. If they coincide, cooking can start right away, thereby making it possible to minimize the overall cooking time including the time the rotatable antenna rotates to the required position.
  • the microwave oven of the fourthi invention is implementable particularly in the microwave oven of the first invention and configured such that in cases where the initial stopping position differs for each cooking, the rotatable antenna stops, after cooking is completed, at a position from which the rotatable antenna will spend the shortest moving time to move to the initial stopping positions. Accordingly, in cases where a different initial stopping position is required for each cooking, it is possible to minimize the overall cooking time including the time the rotatable antenna rotates to the initial stopping positions.
  • the microwave oven of the fifth invention is implementable particularly in the microwave oven of the first invention and configured such that the rotatable antenna stops, after cooking is completed, at the initial stopping position used in the previous cooking. Accordingly, in cases where the same cooking is successively conducted, it is possible to minimize the overall cooking time including the time the rotatable antenna moves to the initial stopping position.
  • the microwave oven of the sixth invention is implementable particularly in the microwave oven of the first invention and configured such that the rotatable antenna stops, after cooking is completed, at the position that has been used as the initial stopping position the greatest number of times in the past. Accordingly, in cases where cooking to be conducted is of the kind most frequently conducted, it is possible to minimize the cooking time including the time the rotatable antenna rotate to the required initial stopping position.
  • the microwave oven of the seventh invention is implementable particularly in the microwave oven of the first invention and has, as the memory, a memory medium that is not erased, even when the power is turned OFF.
  • the microwave oven of the eighth invention is implementable particularly in the microwave oven of the sixth invention and configured such that when the power is turned on, the rotatable antenna is driven up to a predetermined stopping position by a controller, in cases where a predetermined stopping position after cooking is completed differs from the position data stored in the memory.
  • FIG. 1 is a schematic front sectional view of a microwave oven of the first embodiment of the present invention.
  • FIG. 2 is a schematic side sectional view of a microwave oven of the first embodiment of the present invention.
  • FIG. 3 is a schematic planar sectional view of a microwave oven of the first embodiment of the present invention.
  • FIG. 4 is another schematic planar sectional view of a microwave oven of the first embodiment of the present invention.
  • FIG. 5 (a) is a flowchart showing the control process when power is ON for a microwave oven of the first embodiment of the present invention
  • FIG. 5(b) is a flowchart for starting the same menu for a microwave oven of the first embodiment of the present invention
  • FIG. 5(c) is a flowchart when power is OFF for a microwave oven of the first embodiment of the present invention.
  • FIG. 6(a) is a flowchart showing the control process when power is ON for a microwave oven of the second embodiment of the present invention
  • FIG. 6(b) is a flowchart for starting the same menu for a microwave oven of the second embodiment of the present invention
  • FIG. 6(c) is a flowchart when power is OFF for a microwave oven of the second embodiment of the present invention.
  • FIG. 7(a) is a schematic diagram of a prior art microwave oven
  • FIGS. 7(b) and 7(c) describe microwave field concentrations of a prior art microwave oven.
  • FIG. 8 shows the characteristics of a prior art rotary antenna.
  • FIG. 9 shows the characteristics of another prior art rotary antenna.
  • FIG. 10(a) is a top view of another prior art rotary antenna
  • FIG. 10(b) is a side view of another prior art rotary antenna
  • FIG. ll(a) is a top view of another prior art rotary antenna
  • FIG. ll(b) is a side view of another prior art rotary antenna.
  • FIG. 12(a) is a top view of another prior art rotary antenna
  • FIG. 12(b) is a sectional view along K-K' of FIG. 12(a)
  • FIG. 12(c) is a side view.
  • FIG. 13 shows the characteristics of a prior art rotary antenna.
  • FIG. 14(a) is a sectional view of another prior art microwave oven.
  • FIG. 14(b) is a top view of another prior art rotary antenna.
  • FIGS. 15(a) and 15 (b) are drawings describing antenna stopping positions and heating distributions of another prior art microwave oven.
  • FIGS. 16(a) and 16(b) are top views showing antennas of another prior art microwave oven.
  • FIG. 1 to FIG. 4 are schematic diagrams of an electronic range which is a typical microwave oven of the present invention.
  • FIG. 1 is a sectional view from the front.
  • FIG. 2 is a sectional view taken along A-A 1 in FIG. 1.
  • FIG. 3 is a sectional view taken along B-B' in FIG. 1.
  • FIG. 4 is a sectional view taken along C-C in FIG. 1.
  • An electronic range 31 comprises: a waveguide 33 which conducts microwaves emitted from a magnetron 32 which is a typical means for generating microwaves; a heating chamber 34 with a width (about 410 mm) greater than the depth (about 315 mm) and connected to the upper part of the waveguide 33; and a platform 35 affixed to the heating chamber 34 for placing food (not pictured), a typical object to be heated.
  • the platform is made from a low-loss inductive material such as ceramics or glass so that microwaves can pass through.
  • the electronic range also comprises a space 36 being formed above the platform 35 within the heating chamber 34 for accommodating an object or food to be heated [0047]
  • the electronic range further comprises: an antenna space 37 formed below the platform 35 within the heating chamber 34; two rotatable antennas 38, 39 attached in a position symmetrical with respect to the width of the heating chamber 34; motors 40, 41 as typical drive means capable of rotating the rotatable antennas 38, 39; a control means 411 which controls the direction of the rotatable antennas 38, 39 by controlling the motors 40, 41; and a memory for storing the stopping positions of the rotatable antennas.
  • the electronic range is configured to concentrate heat on a specified food product by orienting in a certain direction the portion of at least one of the rotatable antennas 38, 39 which intensely and directionally irradiates microwave.
  • the rotatable antennas 38, 39 are provided with coupling parts 45, 46 formed from a conductive material and formed in an almost cylindrical shape with a diameter of about 18 mm, and passing through almost cylindrical coupling holes 43, 44 with a diameter of about 30 mm provided on the boundary between the waveguide 33 and the heating chamber bottom surface 42.
  • the rotatable antenna 38, 39 are also provided with radiating members 47, 48 formed from a conductive material and having a surface area which is generally larger in the horizontal direction than in the vertical direction.
  • the radiating members 47, 48 are integrally connected by kashime or welding to the upper ends of the coupling parts 45, 46, which are fixed around the motor shafts of the motors 40, 41 so that the axes of the coupling parts 45, 46 coincide with the rotational axes of the motors.
  • the radiating members 47, 48 have a radiation directionality because they are not symmetrical with regard to the rotational centers.
  • the waveguide 33 forms a T-shape, as seen from above in FIG.
  • the radiating members 47, 48 are identical in shape, and the radiating member upper surfaces 51, 52 have an almost rectangular with rounded corners. A pair of opposing thereof have radiating member bent parts 53, 54 bent toward the heating chamber bottom surface 42, so as to restrict the electromagnetic waves from escaping toward the outer side of the two sides.
  • the distance between the heating chamber bottom surface 42 and the radiating member upper surfaces 51, 52 is on the order of about 10 mm, and the radiating member bent parts 53, 54 are pulled down to a position about 5 mm lower therefrom.
  • the remaining pair of sides have different lengths in the horizontal direction from the coupling parts 45, 46 to the end parts, with the length from the center of the coupling parts to end parts 55, 56 being 75 mm, and the length from the center of the coupling parts to end parts 57, 58 being 55 mm.
  • the width of the end parts is at least 80 mm in either case.
  • the rotatable antennas 38, 39 are able to intensify the radiation directionality from the coupling parts 45, 46 toward the end parts 57, 58.
  • the marking 59 is at about the center of the width and at about the center of the depth of the heating chamber 34 and in order to perform concentrated heating of the food product placed on this marking 59, the end parts 57, 58 of the rotatable antennas 38, 39 are controlled so as to be directed in a predetermined direction, toward about the center of the width and toward about the center of the depth of the heating chamber 34.
  • the radiation directionality toward the end parts 57, 58 is intense, making it possible to concentrate heat on the food product placed on the marking 59, which is positioned in an orientation to be irradiated by microwaves from the direction of the end parts 57, 58.
  • a variety of methods are conceivable for orienting the rotatable antennas in a predetermined direction, such as using stepping motors as the motors 40, 41, or even if a constant rotation motor is used, the current-carrying time is controlled by detecting the reference position.
  • a setting panel 60 is placed under a door 61, and a concentrated heating determination means 62 determines whether or not concentrated heating is performed, using the controller 411, based on the content set by the user with the setting panel 60. On the basis of the results of this determination, the controller 411 controls the magnetron 32 and the motors 40, 41.
  • the heating determination means 62 determines that concentrated heating is unnecessary, and the controller 411 controls the rotatable antennas 38, 39 at a constant rotation by the motors 40, 41.
  • the heating determination means 62 determines that concentrated heating is necessary, and the controller 411 rotates the rotatable antennas 38, 39 by driving the motors 40, 41 so as to control the end parts 57, 58 of the radiating members 47, 48 so that they stop when they respectively are oriented toward the center. Accordingly, it is possible to heat rice uniformly in its entirety, and to heat milk by concentrating the heat on the bottom part.
  • the stopping positions of the rotatable antennas 38, 39 at this time are stored by the control means in a memory 412.
  • the two rotatable antennas 38, 39 coupled to a shared waveguide 33 under the heating chamber 34 are disposed symmetrically with respect to the width of the wide heating chamber 34, it is possible to create a greater variety of irradiation patterns for microwaves than if there is a single rotatable antenna, thereby making it possible to easily provide uniform heating distribution throughout the entire chamber.
  • the end parts 57, 58 which are locations of intense radiation directionality of the two rotatable antennas, are oriented in a predetermined direction (toward the center of the chamber), it is possible to intensely emit microwaves in the predetermined direction (toward the center of the chamber), thereby making it possible to easily concentrate heating of a specified object to be heated (milk placed on the marking 59).
  • both of the rotatable antennas 38, 39 are stopped, but a variety of methods of control are conceivable, such as stopping one and rotating the other, alternately or stopping one while in motion and rotating the other, and rotating the one that was stopped while in motion and stopping the one that was rotated.
  • Such control methods are effective in cases where concentrated heating is overly concentrated, and in cases where semi-uniform heating is desired.
  • the ratio of rotating and stopping can be optimized.
  • the microwave oven of the present invention has a very simple configuration wherein the directions of a pair of rotatable antennas 38, 39 coupled to a single waveguide 33 are controlled. Even when switching between uniform heating of the entire chamber and localized concentrated heating, there is absolutely no risk in changing the coupling state of the electromagnetic radiation, making the system safe, and also making it possible to achieve a very practical configuration, since there is not so much of a need for stringent dimensional control, such as control of gaps.
  • Microwaves in the waveguide 33 are drawn from the gap between the coupling holes 43, 44 and the coupling parts 45, 46 toward the heating chamber 34, but since the shape of the radiating members 47, 48 which are integral with the coupling parts 45, 46 is not symmetrical with respect to the rotation axis, the propagation direction of microwaves differs depending on the direction.
  • the radiation directionality is intense in directions in which propagation is easy, and is weak in directions in which propagation is difficult.
  • the rotatable antennas 38, 39 rotate at a constant speed, if electromagnetic radiation is emitted at a constant output for a time sufficiently longer than the frequency of rotation, then it is averaged for the rotational direction, so equidistant positions from the center of rotation result in the same level of heating, yielding a concentric heating distribution (for example, intense heating in a circle, or intense heating in a doughnut shape).
  • the rotatable antennas are stopped and continuously propagating microwaves having intense radiation directionality in a specified direction. It is therefore easy to heat a specified object in a concentrated manner.
  • the position where the object to be heated (milk) by concentrated heating is determined by the marking 59, it is possible to perform concentrated heating of the object to be heated (milk) in the desired state by controlling the location of intense radiation directionality (the end parts 57, 58) in the desired orientation (toward the center), so as to intensify the irradiation of electromagnetic waves in the desired direction (toward the center).
  • concentrated heating is performed by controlling the rotatable antennas 38, 39 on the basis of settings, making it possible to easily change to concentrated heating, even when typically performing uniform heating of the chamber at constant rotation. Risk of error can be reduced, since the user sets the microwave oven to automatically switch from uniform heating to concentrated heating.
  • the embodiment described above can be combined in a variety of ways.
  • a configuration is also possible in which the concentrated heating determination means 62 may determine the necessity for concentrated heating, based not on the output of the setting panel 60, but on the basis of a temperature distribution detected by a temperature detecting means such as an infrared sensor for detecting the temperature of objects to be heated such as food products. If the configuration with the temperature detecting means is adopted, it is possible to direct concentrated heat on the low temperature parts based on the detected temperature distribution. It also becomes possible with the configuration to heat a plurality of different types of products to a uniform temperature.
  • FIGS. 5 (a)-(c) Following is a description of controls in such a configuration, using FIGS. 5 (a)-(c).
  • the power will be turned ON. That is, if a flag is confirmed for the presence of the rotatable antenna stopping positions in memory at Sl, and if the flag for the presence of rotatable antenna stopping positions is 0, it is moved to the base stopping position at S2, and otherwise the flag is set to 0 at S3.
  • the menu is set with the setting panel 60 shown in FIG. 2.
  • the initial stopping position for the selected menu is selected at S4 as shown in FIG. 5 (b).
  • a determination is made at S5 as to whether it is the same as the base stopping position. If they are the same, the process moves to S7, and antenna control starts for the rotatable antennas 38, 39 according to the preset control pattern stored in memory according to the menu. That is to say, it is possible to start cooking by generating high-frequency waves from the magnetron without generating any antenna motion loss when cooking is started, thereby shortening the cooking time by that amount.
  • this base stopping position is set to be a position which is progressively closer to various initial stopping positions for various menus as the frequency of use of the menus is greater, it is possible to speed up the start of cooking with high-frequency waves, and to reduce the antenna motion loss in comparison with cases where the antennas are moved from completely separate positions.
  • a determination is made at S8 as to whether cooking is completed, and antenna control by the control pattern of S7 is continued up to the completion of cooking. If it is determined that cooking is completed, the process moves to S9, and the rotatable antennas 38, 39 are controlled so as to move to the initial stopping position of the selected menu.
  • FIGS. 6 (a), (b) and (c) illustrate the second embodiment. What differs from the first embodiment is a sequence such that after completion of cooking at S8, a record of the most frequent menus is stored at S13, after which the rotatable antennas are moved to the initial stopping positions of the most frequent menus at S 14. These positions are recorded at SlO as a base stopping position, thereby preparing for the next start of cooking.
  • the past usage history is recorded, making it possible to further shorten the antenna moving time by means of a sequence in which the initial stopping positions of the most frequent menus are set as base stopping positions.
  • the memory 412 employs a memory which is not erased even when the power is turned OFF, thereby making it possible to make a determination at Sl. But even if memory is of a type which is erased when the power is turned OFF, the memory can be effectively successive use of the microwave oven according to under the present invention.
  • the present invention is directed to microwave oven as described above is able to perform concentrated heating of a specified object to be heated by controlling locations of intense radiation directionality of a plurality of rotatable antennas, and is able to reduce the heating time by shortening the moving time of the rotatable antennas at the start of cooking, thereby making it applicable to the heating and melting of a variety of derivatives such as food products, the firing, drying, and sintering of ceramics, or use in biochemical reactions and the like.

Landscapes

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

Abstract

L'invention concerne un four à micro-ondes comprenant : deux antennes rotatives (38, 39) disposées symétriquement par rapport à la largeur d'un compartiment de chauffage (34) et s'étendant d'un guide d'onde (33) à un espace d'antenne (37); un moyen de commande commandant des moteurs (40, 41) permettant d'entraîner rotativement les antennes rotatives (38, 39); et une mémoire destinée à stocker les positions d'arrêt des antennes rotatives (38, 39). Le four à micro-ondes de l'invention commande au moins l'une des antennes rotatives dans la position de direction de rayonnement intense dans une direction prédéterminée pour obtenir un chauffage concentré d'un objet spécifié à chauffer, et après la cuisson, les antennes rotatives (38, 39) sont arrêtées dans une position prédéterminée. Ainsi, si la position de direction de rayonnement intense de ladite antenne rotative est commandée dans une direction prédéterminée, il est possible d'émettre des ondes électromagnétiques de manière intense dans une position prédéterminée, ce qui permet de concentrer facilement le chauffage sur l'objet spécifié à chauffer, et de réduire la durée de déplacement pour aller jusqu'à la position d'arrêt prédéterminée, une fois que la cuisson a commencé.
PCT/JP2007/074775 2007-01-12 2007-12-18 Four à micro-ondes WO2008084668A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007004169A JP2008170075A (ja) 2007-01-12 2007-01-12 マイクロ波加熱装置
JP2007-004169 2007-01-12

Publications (1)

Publication Number Publication Date
WO2008084668A1 true WO2008084668A1 (fr) 2008-07-17

Family

ID=39469312

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/074775 WO2008084668A1 (fr) 2007-01-12 2007-12-18 Four à micro-ondes

Country Status (2)

Country Link
JP (1) JP2008170075A (fr)
WO (1) WO2008084668A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012004204A1 (de) * 2012-03-01 2013-09-05 Topinox Sarl Gargerät und Verfahren zur Steuerung eines Gargeräts
TWI663364B (zh) * 2017-03-14 2019-06-21 德國商福維克國際控股有限公司 烹調至少一個食品的系統

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030121913A1 (en) * 2001-12-27 2003-07-03 Sanyo Electric Co., Ltd. Microwave heating device
JP2004219010A (ja) * 2003-01-17 2004-08-05 Sharp Corp 高周波加熱調理器
KR20040099127A (ko) * 2003-05-16 2004-11-26 산요덴키가부시키가이샤 전자레인지

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030121913A1 (en) * 2001-12-27 2003-07-03 Sanyo Electric Co., Ltd. Microwave heating device
JP2004219010A (ja) * 2003-01-17 2004-08-05 Sharp Corp 高周波加熱調理器
KR20040099127A (ko) * 2003-05-16 2004-11-26 산요덴키가부시키가이샤 전자레인지

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012004204A1 (de) * 2012-03-01 2013-09-05 Topinox Sarl Gargerät und Verfahren zur Steuerung eines Gargeräts
TWI663364B (zh) * 2017-03-14 2019-06-21 德國商福維克國際控股有限公司 烹調至少一個食品的系統
US10873995B2 (en) 2017-03-14 2020-12-22 Vorwerk & Co. Interholding Gmbh System for preparing at least one food product

Also Published As

Publication number Publication date
JP2008170075A (ja) 2008-07-24

Similar Documents

Publication Publication Date Title
JP4979280B2 (ja) マイクロ波加熱装置
EP2031936B1 (fr) Dispositif de chauffage à micro-ondes
EP2234456B1 (fr) Dispositif de cuisson
JP2007227134A (ja) マイクロ波加熱装置
WO2008084668A1 (fr) Four à micro-ondes
JP5076626B2 (ja) マイクロ波加熱装置
JP5076625B2 (ja) マイクロ波加熱装置
JP2008166090A (ja) マイクロ波加熱装置
JP5080827B2 (ja) マイクロ波加熱装置
JP3082597B2 (ja) 高周波加熱装置
JP5076627B2 (ja) マイクロ波加熱装置
JP5273930B2 (ja) マイクロ波加熱装置
JP3901350B2 (ja) 電子レンジ
JP4967796B2 (ja) マイクロ波加熱装置
JP4807187B2 (ja) マイクロ波加熱装置
JP4635294B2 (ja) 高周波加熱装置
JP4882427B2 (ja) マイクロ波加熱装置
JP5593710B2 (ja) マイクロ波加熱調理器
JP5194561B2 (ja) マイクロ波加熱装置
JP2001307868A (ja) 高周波加熱装置
JP4966650B2 (ja) マイクロ波加熱装置
JPH07122357A (ja) 高周波加熱装置
JP4126794B2 (ja) 高周波加熱装置
JP5040426B2 (ja) マイクロ波加熱装置
JP2010255872A (ja) 加熱調理器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07860004

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07860004

Country of ref document: EP

Kind code of ref document: A1