JP2719059B2 - microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven,
More specifically, the present invention relates to a microwave oven in which each part of food is heated uniformly.

[0002]

2. Description of the Related Art When heating food by supplying microwaves into an oven oven of a microwave oven, the traveling waves of the supplied microwaves and reflected waves are superimposed because the oven oven is a closed space. A standing wave is formed. In the mode in which the standing wave is formed, spots of high and low electric fields are generated, and a locally overheated portion is formed inside the food. In the design and development of microwave ovens, various devices have been conventionally devised in order to minimize the local heating and uniformly heat each part of the food. For example, as shown in FIG. 14, a power supply port 223 for introducing microwaves is provided on the top surface 212 of the oven 211, and the food is placed on a metal turntable tray and rotated. A power supply port 223 may be provided with a stirrer fan for scattering microwaves.) As shown in FIG.
And a rotating radiation antenna 32 for radiating microwaves into the oven chamber 311 at the power supply port 323.
5 (in order to transmit microwaves, the tray 318 is made of a non-metallic material). 14 and 15, 219, 319
Are magnetrons that output microwaves, 220 and 320
Denotes a waveguide, and 230 and 330 denote rotational driving motors, respectively.

[0003] The above-mentioned microwave oven is
By rotating the food in the microwave standing wave mode inside, the intensity of the electric field is applied to the food on average to achieve uniform heating. In this method, the amount of movement of the food can be increased, and therefore, it is possible to reliably cross the electric field in the weak mode. In the microwave oven, the standing wave mode in the oven can be largely changed by the rotating radiation antenna 325 (the stirrer fan also performs the same function).

[0004]

However, the conventional microwave oven described above still has insufficient heating uniformity. Further, when the quantity, quality, and shape of the food to be heated are different, there is a problem that the heating efficiency (oven load efficiency) greatly varies. For example, in the above-mentioned microwave oven, in the case of a large food, the bottom of the food is mainly heated, and the top of the food tends to remain unheated. In addition, in the above-mentioned microwave oven, in the case of small and small foods, the distance between the power supply port and the food is long, and the oven load efficiency is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a microwave oven which can improve the uniformity of food heating and can reduce the variation in oven load efficiency due to variations in the quantity, quality and shape of the food. .

[0006]

In order to achieve the above object, a microwave oven according to the present invention comprises: an oven chamber having a power supply port of a predetermined size into which a microwave is to be introduced;
A non-metallic turntable tray placed on the bottom surface of the oven cabinet via a roller, a metal rotary shaft fitted with a gap in the power supply port, and the rotary shaft and the roller A roller stay comprising a metal stay to be connected is provided, and the turntable tray is rotated by rotating the roller stay around the rotation axis, and the microwave supplied from the outside of the oven to the power supply port is supplied. In addition, the roller stay radiates into the oven storage.

The microwave oven of the present invention has
Oven oven having a power supply port of a predetermined size to introduce a microwave, and a non-metallic turntable tray placed via a roller on the bottom surface of the oven oven,
A non-metallic rotary shaft fitted with a gap in the power supply port,
A roller stay including a metal stay for connecting the rotating shaft and the roller; rotating the roller stay around the rotating shaft to rotate the turntable tray; The microwave introduced into the oven chamber through the gap in the mouth is scattered by the metal stay.

It is desirable to provide a second power supply port of a predetermined size into which microwaves are to be introduced, on the side surface or the top surface of the oven storage.

In addition, there is provided a rotary radiation antenna comprising a metal rotary shaft fitted into the second power supply port with a gap, and a metal antenna connected perpendicular to the rotary shaft in the oven chamber. Is desirable.

The microwave oven according to the present invention is provided on a wall surface of the oven chamber, and has a power supply port of a predetermined size through which microwaves are supplied from outside the oven chamber through a waveguide; A metal power receiving unit that can be inserted into the waveguide with an adjustable gap, and a metal antenna that is perpendicular to the power receiving unit in the oven chamber. It is characterized by that.

It is preferable that a plurality of the power supply ports be provided, and the radiation antenna be provided in each or a part of the plurality of power supply ports.

[0012]

In a case where a roller stay including a metal rotating shaft fitted into the power supply port with a gap and a metal stay connecting the rotating shaft and the roller is provided, the roller stay drives the roller. In addition to rotating the turntable tray, it acts as a rotating radiation antenna.
Since the roller stay is provided immediately below the turntable tray, microwaves are radiated near the food. Therefore, the electric field mode at the position of the food greatly changes, and the uniformity of heating is improved as compared with the related art. In addition, since the distance between the antenna and the food is shorter than before, the heating efficiency is increased, and fluctuations in oven load efficiency due to variations in the quantity, quality, shape, etc. of the food are reduced as compared with the conventional case.

In the case where a roller stay including a non-metallic rotating shaft fitted into the power supply port with a gap and a metal stay connecting the rotating shaft and the roller is provided,
This roller stay not only drives the rollers to rotate the turntable tray, but also acts as a stirrer fan. Since the roller stay is provided immediately below the turntable tray, microwaves are scattered near the food. Therefore, the electric field mode at the position of the food greatly changes, and the uniformity of heating is improved as compared with the related art. In addition, since the distance between the fan and the food is shorter than before, the heating efficiency is increased, and fluctuations in oven load efficiency due to variations in the quantity, quality, shape, etc. of the food are reduced as compared with the conventional case.

Further, on the side or top surface of the oven storage,
When a second power supply port having an opening of a predetermined size is provided, even when the shape of the food is large, the microwave introduced through the second power supply port causes the side portion and the upper portion of the food to be removed. It can be heated efficiently. Therefore, not only the bottom of the food but also the whole food can be efficiently heated, and the uniformity of heating is improved.

[0015] Further, a rotating radiation comprising a metal rotating shaft fitted into the second power supply port with a gap in the opening, and a metal antenna connected perpendicular to the rotating shaft in the oven chamber. When an antenna is provided, the electric field mode of the microwave introduced through the second power supply port fluctuates. Therefore, the heating uniformity of the food is further improved.

Also, a metal power receiving part which is rod-shaped and fits with a gap in the opening of the power supply port, and whose insertion amount into the waveguide is adjustable, and which is perpendicular to the power receiving part in the oven chamber. If you have a radiation antenna consisting of a connected metal antenna,
By adjusting the insertion amount of the power receiving unit into the waveguide, the amount of microwave power introduced into the oven chamber through the power supply port can be controlled. Therefore, it is possible to perform impedance matching in accordance with variations in the quantity, quality, and shape of food, and fluctuations in oven load efficiency are reduced as compared with the related art.

Further, when the radiation antenna capable of adjusting the insertion amount of the power receiving unit into the waveguide is provided in each or a part of the plurality of power supply ports, the impedance matching of each or some of the power supply ports is provided. By finely changing the state, variations in oven load efficiency are further reduced.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a microwave oven according to the present invention will be described in detail with reference to embodiments.

FIGS. 1 and 2 show a schematic cross section and appearance of a microwave oven according to one embodiment, respectively, and FIG. 3 shows a cross section of a main part of the microwave oven.

As shown in FIG. 2, the microwave oven has an oven cabinet 11 in a casing 10. The oven chamber 11 has a front (door) 16, a rear 17, a top 12,
It comprises a bottom surface 13, a left side surface 14, and a right side surface 15. As shown in FIG. 1, a magnetron 19 is provided on the right side of the oven cabinet 11. Magnetron 19
Outputs microwaves into the waveguide 20 during operation. The waveguide 20 branches into a waveguide 21 connected to the bottom surface 13 of the oven cabinet 11 and a waveguide 22 connected to the right side surface 15 of the oven cabinet 11. As shown in FIG. 3, a first power supply port 23 and a second power supply port 24 having a predetermined size are provided at substantially the center of the bottom surface 13 and the side surface 15 of the oven cabinet 11, respectively. The first power supply port 23 and the second power supply port 24
Are connected to waveguides 21 and 22, respectively. The second power supply port 24 is closed by a plastic cover 32.

An approximately disk-shaped plastic turntable tray 18 is horizontally placed on the bottom surface 13 of the oven cabinet 11 via a plastic roller 28.
A roller stay 25 is provided immediately below the turntable tray 18 in close proximity. This roller stay 2
Reference numeral 5 denotes a cylindrical metal rotary shaft 27 that fits into the first power supply port 23 with a gap, and a metal stay 26 that connects the rotary shaft 27 to the roller 28.
As shown in FIG. 7A, the metal stay 26 has a tapered sheet metal extending radially from the center (in this example, the side 26a of the sheet metal is a straight line). As shown in FIG. 3, the roller 28 is rotatably attached to a tip of the metal stay 26 by a roller shaft 33. At the lower end of the rotating shaft 27, a plastic driving shaft 29 is provided concentrically and integrally. The drive shaft 29 penetrates a portion of the waveguide 21 facing the first power supply port 23, and the lower end is supported by the gear box 31. Reference numeral 34 denotes a stub for impedance matching.

When the food is heated, the drive shaft 29 is connected to the connecting gear 3.
The roller stay 25 is rotated around the rotation shaft 27 at a predetermined rotation speed by receiving the rotation force of the motor 30 via the motor 5. The turntable tray 18 is a roller 2
8, the roller rotates at twice the rotation speed of the roller stay 25. On the other hand, the microwave output from the magnetron 19 into the waveguide 20 is branched into waveguides 21 and
22, and reaches the first power supply port 23 and the second power supply port 24. In the first power supply port 23, the metal rotary shaft 27 serves as a power receiving end, and the metal stay 26 functions as an antenna. That is, the roller stay 25 functions as a rotating radiation antenna. Since the roller stay 25 is provided immediately below the turntable tray 18 and close to the food, microwaves are radiated. Therefore, the electric field mode at the position of the food can be greatly changed, and the uniformity of heating can be improved as compared with the related art. Moreover, since the distance between the antenna (metal stay 26) and the food is shorter than before, the heating efficiency can be increased,
Fluctuations in oven load efficiency due to variations in the amount, quality, shape, etc. of food can be reduced as compared to the past.

Further, since the second power supply port 24 is provided on the side surface 15 of the oven chamber 11, even when the shape of the food is large, the microwave introduced through the second power supply port 24 allows The side and top of the food can be efficiently heated. Therefore, not only the bottom of the food but also the whole food can be efficiently heated, and the heating uniformity can be further improved.

FIG. 8 shows actually measured data of the change in oven load efficiency depending on the load amount. In the measurement, the output of the magnetron 19 was set to a constant value of 600 W, and the load was set by the amount of water filled in the beakers A and B containing 1 liter as shown in FIG. The heating efficiency (output (W)) was evaluated based on the temperature rise of the water. In FIG. 8, the mark ◎ indicates the data of the microwave oven, and the mark ○ indicates the conventional microwave oven (FIG. 1).
4) is shown. As can be seen from FIG. 14, according to the present invention, when the water load is a small load of 180 cc (corresponding to one cup of water), the variation in oven load efficiency is reduced by about 20% as compared with the conventional case. (When the load was large, the heating efficiency did not decrease in both cases.) In FIG. 8, the mark ● indicates the second power supply port 24.
The data when no is provided. in this case,
At a small load, the improvement is almost the same as that of the microwave oven, but at a large load, the heating efficiency is reduced by about 10%.

Although the drive shaft 29 is made of plastic in order to electrically insulate it from the wall surface of the waveguide 21, it may be made of ceramic. As a material of the drive shaft 29, the microwave absorption loss is small, the withstand voltage is high,
Those having a high heat resistance temperature and a high mechanical strength are desirable.

Further, the roller stay 25 is provided as shown in FIG.
It is not limited to the shape shown in (a),
(b), (c) and (d) may be used. In FIG. 1B, a protrusion 26b is provided in the middle of the side 26a of the sheet metal, and the length of the side 26a is adjusted in relation to the wavelength of the microwave. The one shown in FIG. 3 (c) has a disk as the basic configuration of the sheet metal, and has a plurality of fan-shaped openings 26c so that microwave power supplied to the center of the disk is radiated from the entire circumference of the disk. ing. As shown in FIG. 3 (d), the basic configuration of the sheet metal is a disk, as in FIG. 3 (c), and the shape of the opening 26d is devised so that the electric field mode changes greatly during rotation. .

FIG. 4 shows an example in which another roller stay 45 is provided in place of the roller stay 25.
The roller stay 45 has a first power supply port 43 (an opening wider than the first power supply port 23. A plastic cover 42 is provided around a rotation shaft 47 of the roller stay 45).
It is closed by. ) With a gap, and a plastic (non-metallic) rotary shaft 47 and a metal stay 46 connecting the rotary shaft 47 and the roller 28. The roller stay 45 not only drives the roller 28 to rotate the turntable tray 18 but also functions as a stirrer fan. Since the roller stay 45 is provided immediately below the turntable tray 18, the microwave introduced through the first power supply port 43 is scattered near the food. Therefore, the electric field mode at the position of the food greatly changes, and the uniformity of heating is improved as compared with the related art. Moreover, since the distance between the fan and the food is shorter than before, the heating efficiency is increased, and the amount of food,
Fluctuations in oven load efficiency due to variations in quality, shape, etc. are reduced as compared to the conventional case. In this case, the actual oven load efficiency was between ◎ and ● in FIG.
It is considered that the distance falls between the time when the second power supply port is provided and the time when the second power supply port is not provided.

FIG. 5 shows an example in which a rotary radiation antenna 55 is provided at a second power supply port 54 opened on the side surface 15 of the oven chamber 11. This rotating radiation antenna 55 is
And a metal antenna 56 that is vertically connected to the rotating shaft 57 in the oven chamber 11. At the right end of the rotating shaft 57, a plastic driving shaft 59 is provided concentrically and integrally. The drive shaft 59 penetrates a portion of the waveguide 22 that faces the second power supply port 54, and the right end is connected to the motor 60. 52 indicates a plastic cover.

At the time of heating the food, the driving shaft 59 and the rotating shaft 57
And the antenna 56 are integrally rotated by the motor 60. Then, the second power supply port 5 is passed through the waveguide 22.
The microwave arriving at 4 is radiated into the oven chamber 11 by the rotating radiation antenna 55. Therefore, the electric field mode of the microwave can be largely changed by the rotation of the rotary radiation antenna 55, and the uniformity of the heating of the food can be further improved.

Actually, water is heated in the arrangement shown in FIG.
When the variation in the temperature rise between the upper part and the lower part of the water was measured, the result shown in FIG. 10 was obtained. Here, the horizontal axis L indicates the measurement position in the height direction when the height of the filled water is 100%. The circles and circles indicate data when the rotary radiation antenna 55 is provided and not provided in the second power supply port 54, respectively. As can be seen from FIG. 10, the provision of the rotary radiation antenna 55 was able to reduce the temperature rise variation in the height direction by about 30%.

As shown in FIG. 6, the second power supply port 5
4 may be provided on the top surface 12 of the oven chamber 11, and the second power supply port 54 may be provided with the rotary radiation antenna 55. In this case as well, the uniformity of heating of the food can be improved as described above.

FIGS. 11 and 12 show a schematic cross section and a main part cross section of a microwave oven according to another embodiment. As shown in FIG. 11, the microwave oven includes an oven storage 111 in a casing 110. On the right side of the oven storage 111, a magnetron 119 is provided. The magnetron 119 outputs a microwave into the waveguide 120 during operation. The waveguide 120 is provided on the top surface 1 of the oven chamber 111.
The waveguide 21 branches into a waveguide 21 connected to the waveguide 12 and a waveguide 122 connected to the right side surface 115 of the oven chamber 111. At a substantially central portion of the bottom surface 113 and the side surface 115 of the oven chamber 111, a first power supply port 123 and a second
Are provided. Second power supply port 124
Is provided on the wall surface of the auxiliary power supply box 170 formed in a convex shape on the outside, and has a diameter of about 30 mm (magnetron 1).
19 oscillation frequency (less than 2450 MHz). The first power supply port 123 and the second power supply port 12
4 (sub-power supply box 170) is closed with plastic covers 142 and 152, respectively. An electric field sensor 180 for detecting the microwave electric field strength in the oven is provided above the right side surface 115 of the oven oven 111. A substantially disk-shaped metal turntable tray 118 is horizontally placed on the bottom surface 113 of the oven cabinet 111 via rollers 128. Immediately below the turntable tray 118, a roller stay 125
Is provided. The roller stay 125 includes a rotating shaft 127 that is driven to rotate by a motor 130, and a metal stay 126 that connects the rotating shaft 127 and the roller 128. Metal stay 126
Is a tapered sheet metal extending radially from the center as shown in FIG. 7A, for example.

As shown in FIG. 12, the second power supply port 1
24 is provided with a radiation antenna 155. The radiation antenna 155 includes a metal power receiving unit 157 fitted into the second power supply port 124 with a gap, and a disk-shaped metal antenna vertically connected to the power receiving unit 157 in the auxiliary power supply box 170. 156. Power receiving unit 15
A drive shaft 159 made of plastic (non-metal) is provided concentrically and integrally at the end of the waveguide 122 of No. 7. The drive shaft 159 penetrates a portion of the waveguide 122 facing the second power supply port 124. A disk-shaped cam receiving portion 158 is vertically attached to the outer end of the drive shaft 159. A cam 161 driven by the antenna position control motor 160 is in contact with one surface (outer surface) of the cam receiving portion 158. On the other hand, the waveguide 122
Between the outer wall of the cam and the cam receiving portion 158.
A spring 162 for urging the outer side is provided.

During the heating operation, the rotation angle of the cam 161 is controlled by the motor 160 based on the output of the electric field sensor 180 shown in FIG. That is, the insertion amount of the power receiving unit 157 of the radiation antenna 155 into the waveguide 122 is
The impedance is adjusted to match. Therefore, it is possible to reduce fluctuations in oven load efficiency due to variations in the quantity, quality, and shape of the food as compared with the related art. In addition, when cooking is performed by a heating program of a microwave oven, the radiation antenna 1 is set in advance in accordance with the conditions of the food.
The insertion amount of the 55 into the waveguide 122 is determined in advance, and is set in a heating program of a microwave oven. Thereby, heating and cooking can be performed in the microwave power supply mode appropriate for each food.

FIG. 13 shows actually measured data of the change in oven load efficiency depending on the load amount. At the time of measurement, the output of the magnetron 19 was set to a constant value (this is set to 100%), and as shown in FIG.
The load was set based on the amount of water filled in B. Then, the heating efficiency was evaluated based on the temperature rise of the water. In FIG. 13, the mark ◎ indicates data under the optimum impedance matching condition due to the movement of the microwave oven antenna, and the mark ○ indicates data of the conventional microwave oven (shown in FIG. 14). FIG.
As can be seen, according to the present invention, the water load 180
At a small load of cc (corresponding to one cup of water), the fluctuation of the oven load efficiency could be reduced by about 20% compared to the conventional case (when the load was large, both heating efficiency was reduced). No decrease is seen.).

The drive shaft 159 is connected to the waveguide 124
Although it was made of plastic in order to electrically insulate it from the wall surface, it may be made of ceramic. As the material of the drive shaft 159, a material having a small microwave absorption loss, a high withstand voltage, a high heat-resistant temperature, and a high mechanical strength is desirable.

[0037]

As is apparent from the above description, the microwave oven according to the present invention comprises a metal rotary shaft fitted into the power supply port with a gap, and a metal stay connecting the rotary shaft and the roller. Since the roller stay is provided, the roller stay can function as a rotary radiation antenna at a position close to the food. Therefore, the uniformity of the heating of the food can be improved, and the variation in the oven load efficiency due to variations in the quantity, quality, shape, and the like of the food can be reduced.

In the case where a roller stay including a non-metallic rotary shaft fitted into the power supply port with a gap and a metal stay connecting the rotary shaft and the roller is provided, the roller stay is used as a food. Can act as a stirrer fan in a position close to Therefore, the uniformity of the heating of the food can be improved, and the variation in the oven load efficiency due to variations in the quantity, quality, shape, etc. of the food can be reduced.

Further, on the side or top of the oven,
When a second power supply port having an opening of a predetermined size is provided, even when the shape of the food is large, the microwave introduced through the second power supply port causes the side portion and the upper portion of the food to be removed. Heating can be performed efficiently and heating uniformity can be improved.

Further, a rotary radiation antenna comprising a metal rotary shaft fitted into the second power supply port with a gap and a metal antenna connected to the rotary shaft in the oven chamber perpendicular to the metal rotary shaft is provided. In this case, the electric field mode of the microwave introduced through the second power supply port can be changed. Therefore, the heating uniformity of the food can be further improved.

Also, a metal power receiving portion which is rod-shaped, fits into the power supply port with a gap, and whose insertion amount into the waveguide can be adjusted, is connected vertically to the power receiving portion in the oven chamber. When a radiation antenna comprising a metal antenna is provided, by adjusting the amount of insertion of the power receiving unit into the waveguide, the amount of microwave power introduced into the oven chamber through the power supply port can be controlled. . Therefore, the amount of food,
Impedance matching can be performed according to quality and shape variations, and variations in oven load efficiency can be reduced.

Further, when the radiation antenna capable of adjusting the insertion amount into the waveguide is provided in each or a part of the plurality of power supply ports, the impedance matching state of each or a part of the power supply ports can be changed finely. By letting
Variations in oven load efficiency can be further reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic cross section of a microwave oven according to an embodiment of the present invention.

FIG. 2 is a diagram showing an appearance of the microwave oven.

FIG. 3 is a view showing a cross section of a main part of the microwave oven.

FIG. 4 is a diagram showing a cross section of a main part of a microwave oven according to an embodiment of the present invention.

FIG. 5 is a diagram showing a cross section of a main part of a microwave oven according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a main part of a microwave oven according to an embodiment of the present invention.

FIG. 7 is a view showing a modification of the roller stay.

FIG. 8 is a diagram showing data on fluctuations in oven load efficiency.

FIG. 9 is a diagram showing a state in which water is filled in a beaker as an object to be heated.

FIG. 10 is a view showing data of heating uniformity.

FIG. 11 is a diagram showing a schematic cross section of a microwave oven according to another embodiment of the present invention.

FIG. 12 is a view showing a cross section of a main part of the microwave oven.

FIG. 13 is a diagram showing data on fluctuations in oven load efficiency of the microwave oven.

FIG. 14 is a view showing a conventional microwave oven.

FIG. 15 is a view showing a conventional microwave oven.

[Explanation of symbols]

10,110 Casing 11,111
Oven storage 12,112 Top surface 13,113
Bottom 14,114 Left side 15,115
Right side 18,118 Turntable tray 19,119
Magnetron 20, 21, 22 120, 121, 122 Waveguide 23, 43, 123 First power supply port 24, 54, 1
24 Second power supply port 25,125 Roller stay 26,46,1
26 Metal stay 27,54 Metal rotary shaft 28,128
Rollers 29,59,159 Plastic drive shaft 30,130 Motor 31 Gearbox 32,42,52,142,152 Plastic cover 34,134 Impedance matching stub 55 Rotating radiation antenna 56,156
Metal antenna 157 Metal power receiving unit 158 Cam receiving unit 160 Antenna position control motor 161 Cam 170 Secondary power supply box 180 Electric field sensor

Claims (6)

(57) [Claims] An oven having a power supply port of a predetermined size into which microwaves are introduced on a bottom surface, a non-metallic turntable tray placed on the bottom surface of the oven via a roller, and And a roller stay including a metal rotating shaft fitted into the power supply port with a gap, and a metal stay connecting the rotating shaft and the roller. And a microwave supplied to the power supply port from outside of the oven and radiated into the oven by the roller stay, while rotating the turntable tray. 2. An oven cabinet having a power supply port of a predetermined size into which microwaves are to be introduced on a bottom surface, a non-metallic turntable tray placed on the bottom surface of the oven cabinet via a roller, and A non-metallic rotary shaft fitted with a gap in the power supply port,
A roller stay comprising a metal stay for connecting the rotating shaft and the roller; rotating the roller stay around the rotating shaft to rotate the turntable tray; A microwave oven characterized in that microwaves introduced into the oven chamber through the gap in the mouth are scattered by the metal stay. 3. The electronic device according to claim 1, wherein a second power supply port having a predetermined size into which microwaves are introduced is provided on a side surface or a top surface of the oven storage. range. 4. A rotating radiation antenna comprising a metal rotating shaft fitted into the second power supply port with a gap, and a metal antenna connected to the rotating shaft in the oven chamber perpendicular to the rotating shaft. The microwave oven according to claim 3, wherein: 5. A power supply port having a predetermined size, which is provided on a wall surface of the oven chamber and is supplied with microwaves from outside the oven chamber through a waveguide, has a rod shape, and is fitted with a gap in the power supply port. An electronic device comprising: a metal power receiving unit capable of adjusting an insertion amount into the waveguide; and a radiating antenna including a metal antenna connected to the power receiving unit in the oven chamber and perpendicular to the power receiving unit. range. 6. The microwave oven according to claim 5, wherein a plurality of the power supply ports are provided, and the radiation antenna is provided in each or a part of the plurality of power supply ports.