JP2004047322A - Microwave oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heat an article of food by a microwave oven so as to satisfy a user. <P>SOLUTION: This microwave oven 1 is provided, below a heating chamber 10, with a waveguide 19 for connecting a magnetron 12 to the lower part of a body frame 5. Microwaves guided to the heating chamber 10 through the waveguide 19 are diffused to a bottom plate 9 through a radiation antenna 15. A waveguide 50 is installed on the right side of the heating chamber 10. The waveguide 50 is a pipe extending from an introduction opening 50A to an exit 50B, and installed so as to connect a part of the heating chamber 10 lower than the bottom plate 9 to a part thereof higher than the bottom plate 9. By installing the waveguide 50, the microwaves generated by the magnetron 12 is guided from the introduction opening 50A to the exit 50B. That is to say, the microwaves generated by the magnetron 12 is supplied to the article of food in the heating chamber 10 not only from the lower side but also from the upper side by installing the waveguide 50. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooking device, and more particularly, to a microwave oven that heats food with high frequency.
[0002]
[Prior art]
A conventional microwave oven is provided with a magnetron for supplying microwaves, and a waveguide for guiding microwaves oscillated by the magnetron to a heating chamber. Some conventional microwave ovens are supplied with microwaves from the side of the heating chamber, while others are supplied with microwaves from the bottom of the heating chamber.
[0003]
In addition, some conventional microwave ovens include a coaxial antenna existing between the waveguide and the heating chamber, and a radiation antenna attached to an end of the coaxial antenna on the heating chamber side. In such a microwave oven, the microwave was diffused by the radiation antenna and supplied to the heating chamber. In addition, in order to uniformly heat the food in the heating chamber, the microwave may be supplied evenly to the heating chamber by rotating the radiation antenna.
[0004]
[Problems to be solved by the invention]
However, in a conventional microwave oven, when heating food, particularly when heating a food having a thickness such as an entire potato, microwaves are supplied from only one side, so that the entire food is uniform. In some cases could not be heated. Further, in a conventional microwave oven, even when microwaves are supplied from the bottom surface, for example, when heating a flat food having a large surface area, the whole food may not be uniformly heated. That is, the food may not be heated so that the user can be satisfied.
[0005]
Also, some conventional microwave ovens further include a heater for heating the heater. In such a case, it is necessary to avoid deformation of the radiation antenna due to heat generated by the heater. When the radiating antenna is deformed, the pattern of microwave diffusion from the radiating antenna to the heating chamber changes, and microwaves are not evenly supplied to the heating chamber, so that food cannot be heated so that users can be satisfied. This is because it is assumed.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a microwave oven that can heat food so that a user can be satisfied.
[0007]
[Means for Solving the Problems]
A microwave oven according to an aspect of the present invention includes a heating chamber that accommodates food, a magnetron that supplies microwaves to the heating chamber, and a first waveguide that guides microwaves oscillated by the magnetron to the heating chamber. It is characterized by including a tube and a second waveguide for guiding microwaves from a first part of the heating chamber to a second part of the heating chamber different from the first part.
[0008]
According to an aspect of the present invention, in a microwave oven, microwaves are supplied to a heating chamber from a first waveguide and a second waveguide. That is, microwaves are supplied to the heating chamber from more locations than before without increasing the number of magnetrons.
[0009]
Thereby, the microwaves can be evenly supplied to the heating chamber, so that uneven heating of the food can be suppressed without increasing the cost of the microwave oven itself, and the food can be heated so that the user can be satisfied.
[0010]
Further, in the microwave oven according to the present invention, it is preferable that a dimension of the first portion in a direction intersecting with a traveling direction of the microwave is 8 cm or more.
[0011]
Thus, the microwave efficiently travels from the first portion to the second portion.
A microwave oven according to another aspect of the present invention has a heating chamber for storing food, a magnetron that supplies microwaves to the heating chamber, and a waveguide that guides microwaves oscillated by the magnetron to the heating chamber. A plurality of shafts provided over the waveguide and the heating chamber, and a plurality of radiation antennas attached to the heating chamber side end of each of the plurality of shafts, the radiation antenna The waveguide is attached to each of the plurality of shafts, and the waveguide is connected to the magnetron and connected to each of the plurality of shafts.
[0012]
According to another aspect of the present invention, in a microwave oven, a heating chamber is supplied with microwaves from a plurality of radiating antennas. That is, microwaves are supplied to the heating chamber from more locations than before without increasing the number of magnetrons.
[0013]
Thereby, the microwaves can be evenly supplied to the heating chamber, so that uneven heating of the food can be suppressed without increasing the cost of the microwave oven itself, and the food can be heated so that the user can be satisfied.
[0014]
In the microwave oven according to the present invention, it is preferable that the waveguide has a structure branched from the magnetron to each of the plurality of shafts.
[0015]
A microwave oven according to still another aspect of the present invention includes a heating chamber for accommodating food, a heater that emits heat into the heating chamber when supplied with power from a predetermined power supply, and a power supply to the heater. A first control unit for controlling the supply of microwaves, a magnetron for supplying microwaves to the heating chamber, a waveguide for guiding microwaves oscillated by the magnetron to the heating chamber, the waveguide and the heating chamber. , A radiating antenna rotatably attached to the end of the shaft on the heating chamber side with the shaft as a rotation axis, and a second control for controlling the operation of the radiating antenna. The second control unit, when the first control unit is supplying power to the heater, the radiating antenna is attached to the rotating shaft, The distance to the heater is far And wherein the stopping in that state.
[0016]
According to still another aspect of the present invention, in a microwave oven, the radiation antenna is suppressed from being affected by the heat of the heater.
[0017]
Thus, the radiation antenna can be prevented from being deformed by heat, so that the microwave radiated by the magnetron is surely diffused and supplied to the heating chamber by the radiation antenna. That is, since microwaves can be supplied evenly to the heating chamber, uneven heating of the food can be suppressed, and the food can be heated so that the user can be satisfied.
[0018]
In the microwave oven of the present invention, it is preferable that the state in which the distance between the radiation antenna and the heater is the longest is a state in which the shortest distance between the radiation antenna and the heater is longest.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIG. 1 is a perspective view of a microwave oven according to the first embodiment of the present invention.
[0020]
With reference to FIG. 1, a microwave oven 1 mainly includes a main body 2 and a door 3. The outer periphery of the main body 2 is covered with an exterior part 4. An operation panel 6 for a user to input various information to the microwave oven 1 is provided on the front of the main body 2. The main body 2 is supported by a plurality of legs 8. The door 3 is configured to be openable and closable about a lower end as an axis. A handle 3 </ b> A is provided at an upper portion of the door 3. FIG. 2 is a sectional view taken along the line II-II in FIG.
[0021]
A body frame 5 is provided inside the body 2. A heating chamber 10 is provided inside the main body frame 5. The heating chamber 10 is configured to be opened and closed by a door 3. A detection path member 40 is connected to the upper right side of the heating chamber 10. The detection window 11 is formed on the box-shaped bottom surface of the detection path member 40. The infrared sensor 7 catches infrared light in the heating chamber 10 via the detection window 11.
[0022]
A bottom plate 9 is provided in the heating chamber 10. In the heating chamber 10, food to be heated is placed on the bottom plate 9.
[0023]
A magnetron 12 is provided inside the exterior part 4 so as to be adjacent to the lower right of the heating chamber 10. Below the heating chamber 10, a waveguide 19 for connecting the magnetron 12 and the lower part of the main body frame 5 is provided. The waveguide 19 corresponds to a first waveguide of the present invention.
[0024]
An antenna motor 16 is attached to the lower surface of the waveguide 19. Further, a rotating shaft 15 </ b> A is provided from the waveguide 19 to the inside of the heating chamber 10. The rotation shaft 15A is fixed to the antenna motor 16 by a support member 16A so as to be rotatable in the direction of arrow R. A radiation antenna 15 is attached to an end of the rotating shaft 15A on the side of the heating chamber 10 so as to be present between the bottom of the main body frame 5 and the bottom plate 9. The radiation antenna 15 and the antenna motor 16 are connected by a rotation shaft 15A and a support member 16A. When the antenna motor 16 is driven, the radiation antenna 15 rotates. Note that a bearing 15B is provided on the bottom surface of the main body frame 5, and the rotary shaft 15A is installed in the bearing 15B.
[0025]
The high frequency generated by the magnetron 12 is supplied to the heating chamber 10 via the waveguide 19 while being stirred by the radiation antenna 15. Thus, the food on the bottom plate 9 is heated.
[0026]
In order to efficiently guide the microwave oscillated by the magnetron 12 into the heating chamber 10, the distance LA from the magnetron antenna 12A of the magnetron 12 to the end of the waveguide 19 in the traveling direction of the microwave is determined by the microwave. Assuming that the wavelength is λ, it is preferable that the wavelength be an integral multiple of “λ / 2”, that is, the following equation (1).
[0027]
LA = (λ / 2) × n (n is an integer) (1)
The distance LB from the end of the waveguide 19 to the rotation axis 15A is preferably set to １ ／ of λ.
[0028]
A waveguide 50 corresponding to the second waveguide of the present invention is provided on the right side of the heating chamber 10. The waveguide 50 is a tube extending from the inlet 50A to the outlet 50B, and is provided so as to connect a portion of the heating chamber 10 below the bottom plate 9 and a portion above the bottom plate 9. In the heating chamber 10, holes having the same shape are formed at positions where the inlet 50 </ b> A and the outlet 50 </ b> B are connected. In the microwave oven 1, the microwave oscillated by the magnetron 12 is guided from the inlet 50A to the outlet 50B by providing the waveguide 50. That is, by providing the waveguide 50, the microwaves oscillated by the magnetron 12 are supplied to the food in the heating chamber 10 not only from below but also from above. From such a viewpoint, the outlet 50B is located at an upper portion of the heating chamber 10, preferably at a position of １ ／ or more of the height of the heating chamber 10, and more preferably at ２ or more of a height of the heating chamber 10. It is preferable to be mounted at the position of. The size (diameter) of the outlet 50B is considered to be more efficiently guided to the heating chamber 10 by the microwave in the waveguide 50 as it is larger, but there is no particular limitation.
[0029]
FIG. 3 is an enlarged view of the lower periphery of the heating chamber 10 of FIG. Here, with further reference to FIG. 3, the progress of the microwave guided to the heating chamber 10 via the waveguide 19 is schematically indicated by white arrows. In FIG. 3, of microwaves guided into the heating chamber 10 via the waveguide 19, those guided near the inlet 50 </ b> A from the outlet 50 </ b> B via the waveguide 50. Guided to the top of 10.
[0030]
In order to efficiently guide the microwave to the waveguide 50, the dimension LC of the inlet 50A in the direction intersecting with the direction in which the microwave travels is preferably set to 8 cm or more.
[0031]
FIG. 4 shows a first modification of the microwave oven 1 shown in FIGS. 1 and 2 of the present embodiment. In the microwave oven 1 shown in FIG. 4, the inlet 50A of the waveguide 50 is connected to the lower surface of the heating chamber 10. As shown in FIGS. 2 and 4, the inlet 50 </ b> A of the waveguide 50 may be connected to the side surface or the lower surface of the heating chamber 10. Further, the outlet 50B of the waveguide 50 may be connected not only to the side surface of the heating chamber 10 but also to the top surface or the back surface (the surface at the back as viewed from the door 3 side), or over a plurality of surfaces. It may be connected.
[0032]
In the example illustrated in FIG. 4, the microwave guided to the vicinity of the inlet 50 </ b> A travels downward when guided into the waveguide 50. Further, it is preferable that the dimension LD of the introduction port 50A in the example shown in FIG. 4 in the direction intersecting with the direction in which the microwave travels (downward in FIG. 4) is set to 8 cm or more, similarly to LC.
[0033]
FIG. 5 is a view showing a second modification of the microwave oven 1 of the present embodiment, and FIG. 6 is an enlarged view of a lower portion of the heating chamber 10 of FIG. Also, in FIG. 6, the traveling direction of the microwave is schematically shown by a white arrow.
[0034]
In the second modified example, a reflector 51 is provided near the inlet 50A from the heating chamber 10 to the inside of the waveguide 50 and made of a dielectric material. Thereby, the microwave guided to the vicinity of the inlet 50 </ b> A is more efficiently guided to the inside of the waveguide 50.
[0035]
In this embodiment, the radiation antenna 15 is attached to the rotating shaft 15A at a portion other than the center. Specifically, as shown in FIG. 6, the radiation antenna 15 includes ends 15X and 15Y. The distances from the points of the ends 15X and 15Y on the radiation antenna 15 corresponding to the rotation center of the rotation shaft 15A are shown as LX and LY (LX> LY), respectively.
[0036]
In FIG. 6, the end 15X is located near the inlet 50A. In this state, the microwave guided to the radiation antenna 15 becomes easy to be guided into the waveguide 50 via the end 15X, whereby a relatively large number of microwaves can be supplied from the outlet 50B.
[0037]
On the other hand, FIG. 7 shows a state in which the end 15X and the end 15Y are switched from the state shown in FIG. 6 by the rotation of the rotation shaft 15A in the direction of the arrow R (see FIG. 2). In this state, the end 15Y is located closer to the inlet 50A than the end 15X. However, the distance from the end 15Y to the inlet 50A in the state shown in FIG. 7 is longer than the distance from the end 15X to the inlet 50A in the state shown in FIG. The guided microwave does not easily travel to the inlet 50A. Thus, in the state shown in FIG. 7, the microwave is less likely to be guided into the waveguide 50 than in the state shown in FIG. 6, and the amount of the microwave supplied from the outlet 50B is smaller.
[0038]
In the microwave oven 1 according to the present embodiment and each of its modifications, control means for controlling the driving of the antenna motor 16 is provided. Then, in the microwave oven 1, the magnetron 12 is stopped in a state where the rotation of the radiation antenna 15 is stopped at an appropriate position by utilizing the relationship between the position of the radiation antenna 15 and the mode of diffusion of the microwave as described above. By oscillating the microwave on the bottom plate 9, it is possible to select whether to supply the microwave on the food on the bottom plate 9 mainly from below or to supply the microwave mainly from above. Of course, the microwave can be oscillated in the magnetron 12 while the radiation antenna 15 is continuously rotated, and the microwave can be evenly supplied into the heating chamber 10.
[0039]
FIG. 8 shows a third modification of the microwave oven 1 of the present embodiment. The third modified example is a diagram showing a state in which a reflector as shown in FIGS. 5 and 6 is provided as a reflector 52 in the microwave oven 1 as shown in FIG. The reflection plate 52 is made of a dielectric. Since the positional relationship between the heating chamber 10 and the inlet 50A in the microwave oven 1 is different between FIG. 6 and FIG. 8, the reflection plate 52 is formed such that the reflection plate 52 extends from the heating chamber 10 to the inside of the waveguide 50. It has a shape different from that of the plate 51.
[0040]
[Second embodiment]
FIG. 9 is a view of a vertical cross section of the microwave oven 1 according to the second embodiment of the present invention as viewed from the right side. 9 corresponds to a cross-sectional view of the microwave oven 1 of FIG. 1 taken along line IX-IX. FIG. 10 is a diagram showing a cross section of the exterior part 4 and the main body frame 5 of the microwave oven 1 according to the present embodiment as viewed from above.
[0041]
Referring to FIGS. 9 and 10, in microwave oven 1 of the present embodiment, magnetron 12 is installed behind heating room 10, that is, on the opposite side of door 3 with respect to heating room 10. Below the bottom plate 9, two radiating antennas 15 and a rotating shaft 15 </ b> A are provided so as to be aligned in the left-right direction when viewed from the door 3. The waveguide 19 has a structure of two branches from the magnetron 12 toward the heating chamber 10 so as to accommodate the two rotation shafts 15A.
[0042]
Also in the present embodiment, the distance LE of the rotation axis 15A from the end of the waveguide 19 in the traveling direction of the microwave is set to １ ／ of the wavelength λ of the microwave.
[0043]
FIG. 11 is a longitudinal sectional view of microwave oven 1 of the present embodiment, and is a view corresponding to a sectional view taken along line II-II of microwave oven 1 of FIG.
[0044]
Below the waveguide 19, the antenna motors 16 attached to the two rotation shafts 15A are attached. The two antenna motors 16 are fitted on the rails 20, respectively. The rail 20 is provided to enable the antenna motor 16 to move along a predetermined vertical path. The antenna motors 16 are each fixed to the cam 21. Each of the cams 21 is connected to a cam motor 22 via a connection portion 22A.
[0045]
The connecting portion 22A is connected to the cam 21 at a position away from the center of the cam 21. From this, when the cam 21 rotates due to the rotation of the cam motor 22, the vertical position of the antenna motor 16 changes. Thereby, the penetration length LF of the rotation shaft 15A, which is the length of penetration into the waveguide 19, is changed. Note that the length in this case is a length in the traveling direction of the microwave, and is a vertical direction in the vicinity of the rotation shaft 15A in FIG.
[0046]
FIG. 12 is a control block diagram of the microwave oven 1 according to the present embodiment.
Referring to FIG. 12, microwave oven 1 includes a control unit 100 that entirely controls the operation of microwave oven 1. The control unit 100 includes a magnetron 12, a heater 30 for heating food in the heating chamber 10 by emitting heat, a cooling fan 31 for cooling members in the exterior unit 4 such as the magnetron 12, an antenna motor 16, and a cam. The operation of the motor 22, the sensor drive motor 70 for moving the infrared sensor 7 to change the infrared detection area of the infrared sensor 7, and the display unit 60 provided in the operation panel 6 are controlled. The control unit 100 includes information input by a key (operation unit) in the operation panel 6, a temperature sensor 32 for detecting a temperature of a predetermined location in the exterior unit 4, and a detection output from the infrared sensor 7. Is entered.
[0047]
As shown in FIG. 12, in the present embodiment, the two cam motors 22 are independently controlled. Thereby, the penetration lengths of the two rotating shafts 15A are independently controlled.
[0048]
When there are a plurality of rotary shafts 15A to which the radiation antenna 15 is attached in the microwave oven, the radiation antenna 15 attached to the rotary shaft 15A having a long penetration length is replaced by the radiation antenna 15 attached to the rotation shaft 15A having a short penetration length. More microwaves are guided from the waveguide 19 than 15.
[0049]
13 and 14 are enlarged views of the vicinity of the rotation shaft 15A of the present embodiment. In FIG. 13, LF1 is the penetration length of one rotating shaft 15A in the microwave oven 1 of the present embodiment, and LF2 is the penetration length of the other rotating shaft 15A. In this embodiment, as shown in FIG. 13, when “LF1 = LF2”, microwaves of the same degree are supplied to the heating chamber 10 via the two radiation antennas 15. In this case, it is considered that the microwaves are evenly supplied into the heating chamber 10.
[0050]
On the other hand, as shown in FIG. 14, when the penetration length of one rotary shaft 15A is “LF3”, but the other rotary shaft 15A is located at a position where it does not enter the waveguide 19, the heating chamber 10 The microwave is mainly guided from the radiation antenna 15 attached to the one rotation shaft 15A, and the microwave is not guided from the radiation antenna 15 attached to the other rotation shaft 15A. In this case, the microwave oscillated by the magnetron 12 is mainly supplied to the heating chamber 10 through the radiating antenna 15 attached to one of the rotating shafts 15A. Will be supplied.
[0051]
That is, in the present embodiment, by appropriately controlling the driving modes of the two cam motors 22 by the control unit 100, the microwaves are supplied to the heating chamber 10 evenly over the entirety or locally. For example, a pattern for supplying microwaves into the heating chamber 10 can be intentionally changed.
[0052]
In addition, when supplying microwaves locally, the location in the heating chamber 10 where the microwaves are supplied is controlled by controlling the position where the rotation of the cam 21 is stopped. Can be. Thereby, a pattern for supplying microwaves to the heating chamber 10 can be selected according to the arrangement of foods in the heating chamber 10. The following examples can be given as specific examples when supplying microwaves locally.
[0053]
When two foods having different initial temperatures are placed in the heating chamber 10, the penetration length of the rotating shaft 15A connected to the radiation antenna 15 closer to the food having the lower initial temperature is determined by the other rotation. It is longer than the penetration length of the shaft 15A. In the heating chamber 10, the position and temperature of the food are detected by the infrared sensor 7. Then, when the temperature difference between the two foods in the heating chamber 10 disappears or becomes smaller than a predetermined value, the penetration lengths of the two rotating shafts 15A are made equal. Thereby, in the microwave oven 1, cooking in which two foods having different initial temperatures are heated to approximately the same temperature can be executed as automatic cooking.
[0054]
[Third Embodiment]
FIG. 15 is a longitudinal sectional view of the microwave oven 1 according to the third embodiment of the present invention, and corresponds to a sectional view taken along line II-II in FIG.
[0055]
The microwave oven 1 according to the present embodiment includes a heater 30 near the radiation antenna 15. In the present embodiment, a region below the bottom plate 9 of the heating chamber 10 and provided with the radiation antenna 10 and the heater 30 is a region 5W.
[0056]
In the microwave oven 1 of the present embodiment, a cam 88 is provided between the motor antenna 16 and the waveguide 19. The cam 88 is supported by a support member 16A similarly to the rotary shaft 15A. A switch 89 is provided near the cam 88. The control block diagram of the microwave oven 1 of the present embodiment is such that the detection output of the switch 89 is further input to the control unit 100 in the control block diagram as shown in FIG.
[0057]
FIG. 16 is a diagram schematically showing the positional relationship among the motor antenna 16, the cam 88, and the switch 89 shown in FIG. The cam 88 rotates in the direction of arrow P in FIG. 16 around the support member 16A when the antenna motor 16 is driven. The cam 88 is supported by the support member 16A at a position shifted from the center thereof. Then, the cam 88 switches the switch 89 on / off once per rotation. Note that the rotation speed of the cam 88 depends on the driving force of the antenna motor 16. Therefore, in the present embodiment, the control unit 100 accurately controls the timing at which the driving of the antenna motor 16 is stopped while referring to the time from when the switch 89 is turned on / off, so that the radiation antenna can be accurately controlled. It is possible to control the stop timing of the 15 rotations.
[0058]
The fact that the stop timing of the radiation antenna 15 is accurately controlled is used particularly for accurately controlling the positional relationship of the radiation antenna 15 with respect to the heater 30 in the present embodiment.
[0059]
FIGS. 17 and 18 are diagrams showing the positional relationship between the heater 30 and the radiation antenna 15 in the present embodiment, and correspond to diagrams when viewed from above. In the microwave oven 1, when the heater is heated by the heater 30 generating heat, the radiation antenna 15 is stopped as shown in FIG. The state shown in FIG. 17 is a state in which the radiation antenna 15 is fixed to the rotating shaft 15A and the shortest distance LG between the heater 30 and the radiation antenna 15 is the longest.
[0060]
FIG. 18 shows a state where the shortest distance between the heater 30 and the radiation antenna 15 is shorter than that in FIG. That is, the shortest distance LH between the heater 30 and the radiation antenna 15 in FIG. 18 is shorter than the distance LG shown in FIG.
[0061]
FIG. 19 and FIG. 20 are diagrams showing modified examples of the present embodiment. In the present embodiment, the heater 30 has an annular shape as shown in FIGS. 17 and 18, but in a modified example shown in FIGS. 19 and 20, the heater 30 has two rod-like shapes. It is original.
[0062]
FIG. 19 shows a state where the shortest distance LJ between the heater 30 and the radiation antenna 15 is the longest. In this modification, when the heater is being heated by the heater 30, the radiation antenna 15 is stopped in the state shown in FIG. On the other hand, FIG. 20 shows a state where the heater 30 and the radiation antenna 15 overlap.
[0063]
The state shown in FIGS. 18 and 20 is a state that can be taken unless the heater heating by the heater 30 is performed.
[0064]
Further, in the present embodiment, the distance between heater 30 and radiating antenna 15 is considered in the horizontal direction (the direction parallel to the surface on which bottom plate 9 extends), but the distance in the vertical direction can also be considered. That is, by providing the cam 21 and the cam motor 22 in the second embodiment, the height position of the radiation antenna 15 may be adjusted to change the distance from the heater 30.
[0065]
Controlling the timing of stopping the rotation of the rotating body by controlling the drive timing of the motor using a cam and a switch as described in the present embodiment is the same as that described in the second embodiment. By controlling the drive timing of the cam motor 22, the present invention can be applied to accurately control the stop timing of the rotation of the cam 21. Thereby, the height of the rotation shaft 15A can be accurately controlled.
[0066]
It should be understood that each embodiment and its modifications disclosed this time are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Further, each embodiment may be implemented alone or in combination as much as possible.
[Brief description of the drawings]
FIG. 1 is a perspective view of a microwave oven according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the microwave oven of FIG. 1 taken along line II-II.
FIG. 3 is an enlarged view of the lower periphery of the heating chamber of FIG. 2;
FIG. 4 is a diagram showing a first modification of the microwave oven of FIG. 1;
FIG. 5 is a view showing a second modification of the microwave oven of FIG. 1;
FIG. 6 is an enlarged view of the lower periphery of the heating chamber of FIG. 5;
FIG. 7 is an enlarged view of the lower periphery of the heating chamber of FIG. 5;
FIG. 8 is a diagram showing a third modification of the microwave oven of FIG. 1;
FIG. 9 is a longitudinal sectional view of a microwave oven according to a second embodiment of the present invention.
FIG. 10 is a cross-sectional view of an exterior part and a body frame of a microwave oven according to a second embodiment of the present invention.
FIG. 11 is a longitudinal sectional view of a microwave oven according to a second embodiment of the present invention.
FIG. 12 is a control block diagram of a microwave oven according to a second embodiment of the present invention.
FIG. 13 is an enlarged view near a rotation axis according to the second embodiment of the present invention.
FIG. 14 is an enlarged view around a rotation axis according to the second embodiment of the present invention.
FIG. 15 is a longitudinal sectional view of a microwave oven according to a third embodiment of the present invention.
16 is a diagram schematically showing a positional relationship among a motor antenna, a cam, and a switch shown in FIG.
FIG. 17 is a diagram showing a positional relationship between a heater and a radiation antenna in a microwave oven according to a third embodiment of the present invention.
FIG. 18 is a diagram illustrating a positional relationship between a heater and a radiation antenna in the microwave oven according to the third embodiment of the present invention.
FIG. 19 is a diagram showing a positional relationship between a heater and a radiation antenna in a microwave oven according to a modification of the third embodiment of the present invention.
FIG. 20 is a diagram showing a positional relationship between a heater and a radiation antenna in a microwave oven according to a modification of the third embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 microwave oven, 3 door, 6 operation panel, 7 infrared sensor, 10 heating chamber, 15 radiation antenna, 15A rotation axis, 16 antenna motor, 19,50 waveguide, 21 cam, 22 cam motor, 30 heater, 100 Control unit.

Claims (6)

A heating chamber for containing food;
A magnetron for supplying microwaves to the heating chamber,
A first waveguide for guiding microwaves oscillated by the magnetron to the heating chamber;
A second waveguide that guides microwaves from a first portion of the heating chamber to a second portion of the heating chamber that is different than the first portion. 2. The microwave oven according to claim 1, wherein a dimension of the first portion in a direction intersecting with a traveling direction of the microwave is 8 cm or more. A heating chamber for containing food;
A magnetron for supplying microwaves to the heating chamber,
A waveguide that guides the microwave oscillated by the magnetron to the heating chamber,
A plurality of shafts provided over the waveguide and the heating chamber,
Including a plurality of radiation antennas attached to the heating chamber side end to each of the plurality of shafts,
The radiation antenna is attached to each of the plurality of shafts,
A microwave oven, wherein the waveguide is connected to the magnetron and connected to each of the plurality of shafts. The microwave oven according to claim 3, wherein the waveguide has a structure branched from the magnetron to each of the plurality of shafts. A heating chamber for containing food;
A heater that emits heat into the heating chamber when supplied with power from a predetermined power supply;
A first control unit that controls supply of power to the heater;
A magnetron for supplying microwaves to the heating chamber,
A waveguide that guides the microwave oscillated by the magnetron to the heating chamber,
A shaft provided over the waveguide and the heating chamber;
A radiating antenna rotatably attached to the heating chamber side end of the shaft body, with the shaft body as a rotation axis,
A second control unit for controlling the operation of the radiation antenna,
The second control unit may be configured such that when the first control unit supplies power to the heater, the radiation antenna is mounted on the rotating shaft, and a distance from the heater is A microwave oven that stops at the farthest point. The microwave oven according to claim 5, wherein the state in which the radiation antenna has the longest distance from the heater is a state in which the shortest distance between the radiation antenna and the heater is longest.

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