WO2018168194A1

WO2018168194A1 - Microwave heating device and method for controlling microwave heating device

Info

Publication number: WO2018168194A1
Application number: PCT/JP2018/001548
Authority: WO
Inventors: 雅之細田
Original assignee: 富士通株式会社
Priority date: 2017-03-13
Filing date: 2018-01-19
Publication date: 2018-09-20
Also published as: JP2018152245A; JP6809307B2

Abstract

[Problem] To provide: a microwave heating device in which the efficiency of supplying energy to an object to be heated is improved; and a method for controlling the microwave heating device. [Solution] This microwave heating device comprises: a heating chamber; a placement table which is provided in the heating chamber and on which an object to be heated is placed; a plate-shaped member which is made of a dielectric body and which is provided under the placement table in the heating chamber; an antenna which is provided under the plate-shaped member in the heating chamber and which radiates microwaves; a first moving mechanism which vertically moves the plate-shaped member; an intensity measurement unit which measures the intensity of reflection waves of the microwaves via the antenna; and a control unit which controls movement of the first moving mechanism on the basis of the intensity measured by the intensity measurement unit, and moves the plate-shaped member to a first position in which the intensity is equal to or less than a predetermined intensity.

Description

Microwave heating apparatus and method for controlling microwave heating apparatus

The present invention relates to a microwave heating apparatus and a method for controlling the microwave heating apparatus.

Conventionally, there has been a microwave oven configured to supply microwaves output from a microwave generation source to a heating chamber via a reflector, and to cook foods installed in the heating chamber. Variable means that can support and change the angle of the reflector, sensor means for detecting the microwave reflected by the food in the heating chamber, and the weight of the food in the heating chamber in response to the output of the sensor means Calculating means for calculating. Storage means that stores the relationship between food weight, reflector angle and microwave supply efficiency in advance, and the reflector angle that can supply microwaves most efficiently to the calculated weight of food. And a control means for controlling the variable means so that the reflector is set at the read angle (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 06-251866

By the way, the conventional microwave oven (an example of a microwave heating apparatus) controls the angle of the reflector based on the relationship between the angle of the reflector and the supply efficiency of the microwave to the food. There was a limit to energy supply efficiency as a microwave heating device.

Therefore, an object of the present invention is to provide a microwave heating apparatus and a method for controlling the microwave heating apparatus that improve the efficiency of energy supply to the heating object.

A microwave heating apparatus according to an embodiment of the present invention includes a heating chamber, a mounting table disposed in the heating chamber, on which a heating target is mounted, and a dielectric disposed below the mounting table in the heating chamber. A body-made plate-like member, an antenna for radiating microwaves disposed under the plate-like member in the heating chamber, a first moving mechanism for moving the plate-like member up and down, and the antenna Based on the intensity measured by the intensity measuring unit that measures the intensity of the reflected wave of the microwave and the intensity measuring unit, the movement control of the first moving mechanism is performed, and the first position where the intensity is equal to or less than a predetermined intensity is set. And a control unit that moves the plate-like member.

It is possible to provide a microwave heating apparatus that improves the efficiency of energy supply to the object to be heated, and a method for controlling the microwave heating apparatus.

1 is a diagram illustrating a microwave heating apparatus 100 according to a first embodiment. It is a characteristic view which shows the intensity | strength of the reflected wave of a microwave when the position of the antenna 150 and the position of the heating target object 10 are changed. It is a figure which shows the flowchart showing the process which the control part 190 of the microwave heating apparatus 100 of Embodiment 1 performs. It is a figure which shows the microwave heating apparatus 200 of Embodiment 2. FIG. It is a figure which shows the flowchart showing the process which the control part 290 of the microwave heating apparatus 200 of Embodiment 2 performs.

Hereinafter, embodiments in which the microwave heating device and the control method of the microwave heating device of the present invention are applied will be described.

<Embodiment 1>
FIG. 1 is a diagram illustrating a microwave heating apparatus 100 according to the first embodiment. In FIG. 1, the internal structure of the microwave heating apparatus 100 is shown transparently. In FIG. 1, an XYZ coordinate system is defined as shown. Moreover, since the microwave heating apparatus 100 is installed with the lid 111 of the housing 110 facing upward as illustrated, the Z-axis positive direction is up and the Z-axis negative direction is down.

The microwave heating apparatus 100 is a microwave oven that heats food or drink using microwaves. The microwave heating apparatus 100 includes a housing 110, a base 120, a mounting table 130, a plate 140, an antenna 150, a reflector 160,

driving mechanisms

171, 172, 173, and 174, a high frequency generator 180, a power meter 181 and a control unit. 190 is included.

The housing 110 is a cylindrical metal member and has a lid 111 on the top. The inside of the housing 110 is a heating chamber. Inside the housing 110, a mounting table 130, a plate 140, an antenna 150, and a reflecting plate 160 are arranged. A base 120 is disposed under the housing 110. The housing 110 and the base 120 are fixed.

The casing 110 is provided to heat the object to be heated 10 such as food or drink, and has a structure for sealing the microwave so as not to leak the microwave radiated from the antenna 150 to the outside. Yes. The heating object 10 can be taken in and out of the heating chamber with the lid 111 opened.

The base 120 is a metal or resin casing that is fixed to the lower side of the casing 110 and holds the casing 110.

Drive mechanisms

171, 172, 173, 174, a high frequency generator 180, a power meter 181, and a control unit 190 are disposed inside the base 120. Electric power is supplied to the

drive mechanisms

171, 172, 173, 174 and the control unit 190 through a power cord (not shown).

The mounting table 130 is a dielectric (for example, ceramic) table on which the object to be heated 10 is placed, and has a disk shape that matches the shape of the heating chamber of the housing 110. The mounting table 130 has a stay 131 connected to the lower surface.

The stay 131 extends downward from the lower surface of the mounting table 130. The stay 131 is held by a drive mechanism 171. When the drive mechanism 171 moves the stay 131 in the vertical direction, the mounting table 130 is moved in the vertical direction. In FIG. 1, for convenience of explanation, one stay 131 is shown, but a plurality of stays 131 may be provided. Further, the mounting table 130 does not rotate in the XY plan view.

The plate 140 is arranged below the mounting table 130 inside the heating chamber. The plate 140 is a disk-shaped member made of a dielectric material, and is a member having a lens effect for reducing the microwaves radiated from the antenna 150. The plate 140 is an example of a plate member made of a dielectric. The dielectric constant of the plate 140 is higher than the dielectric constant of the mounting table 130. The plate 140 is arranged in parallel with the disk-shaped mounting table 130 in a state where the center is aligned in the XY plan view.

The plate 140 has a stay 141 connected to the lower surface. The stay 141 is a rod-like member and extends downward from the lower surface of the plate 140. The stay 141 is held by a drive mechanism 172, and the plate 140 is moved in the vertical direction by the drive mechanism 172 moving the stay 141 in the vertical direction. In FIG. 1, for convenience of explanation, one stay 141 is shown, but a plurality of stays 141 may be provided.

The antenna 150 is disposed below the plate 140 inside the heating chamber. The antenna 150 is, for example, a rectangular or circular patch antenna in the XY plan view. The antenna 150 is connected to the high frequency generator 180 and radiates the microwave input from the high frequency generator 180 in the Z-axis direction. The microwave radiated from the antenna 150 is transmitted to the heating object 10 through the plate 140 and the mounting table 130.

The antenna 150 has a stay 151 connected to the lower surface. The stay 151 is a rod-shaped member and extends downward from the lower surface of the antenna 150. The stay 151 is held by a drive mechanism 173, and when the drive mechanism 173 moves the stay 151 in the vertical direction, the antenna 150 is moved in the vertical direction. In FIG. 1, for convenience of explanation, one stay 151 is shown, but a plurality of stays 151 may be provided.

The reflection plate 160 is provided at the lower end of the housing 110 and raises the microwave reflected by the inner wall of the housing 110 (the inner wall of the heating chamber) and / or the microwave radiated downward from the antenna 150. By reflecting in the direction, it is provided to efficiently irradiate the object to be heated 10 with microwaves.

The reflector 160 has a stay 161 connected to the lower surface. The stay 161 is a rod-shaped member, and extends downward from the lower surface of the reflecting plate 160. The stay 161 is held by a drive mechanism 174. When the drive mechanism 174 moves the stay 161 in the vertical direction, the reflecting plate 160 is moved in the vertical direction. In FIG. 1, for convenience of explanation, one stay 161 is shown, but a plurality of stays 161 may be provided.

The driving

mechanisms

171, 172, 173, and 174 are actuators that move the mounting table 130, the plate 140, the antenna 150, and the reflecting plate 160 in the vertical direction, respectively. The drive mechanism 172 is an example of a first moving mechanism. The

drive mechanisms

171 and 173 are an example of a second moving mechanism. The drive mechanism 174 is an example of a third movement mechanism.

The driving

mechanisms

171, 172, 173, and 174 may be of any type as long as they are actuators that move the mounting table 130, the plate 140, the antenna 150, and the reflection plate 160 in the vertical direction.

Here, when the positions of the mounting table 130, the plate 140, the antenna 150, and the reflection plate 160 are changed, the frequency at which the impedance is matched as viewed from the antenna 150 is changed. In other words, when the positions of the mounting table 130, the plate 140, the antenna 150, and the reflection plate 160 change, the intensity of the reflected microwave wave output from the antenna 150 changes. Further, the frequency at which the impedance viewed from the antenna 150 is matched changes depending on the type of the heating object 10.

For this reason, in the microwave heating apparatus 100, the position of the mounting table 130, the plate 140, the antenna 150, and the reflecting plate 160 is set so that the intensity of the reflected wave is reduced in a state where the heating target 10 is placed on the mounting table 130. After the adjustment, the heat treatment of the heating object 10 is performed.

The high frequency generator 180 is a high frequency source that generates a microwave, and outputs the microwave to the antenna 150. As an example, the frequency of the microwave generated by the high-frequency generator 180 is as follows:
2.45 GHz. In Japan, it may be between 2.4 GHz and 2.5 GHz (ISM (Industry Science Medical) band). The high frequency generator 180 and the antenna 150 are connected by, for example, a coaxial cable.

As the high-frequency generator 180, for example, GaN-HEMT (High Electron Mobility)
A transistor including a solid-state oscillation element realized by a transistor (high electron mobility transistor) as a microwave generation source can be used.

The power meter 181 is an example of an intensity measurement unit that measures the intensity of the reflected wave of the microwave received by the antenna 150. The power meter 181 and the antenna 150 are connected by, for example, a coaxial cable. The power meter 181 is connected to the control unit 190 and outputs a signal representing the intensity of the reflected wave to the control unit 190.

The control unit 190 performs drive control (movement control) of the

drive mechanisms

171, 172, 173, and 174 and drive control of the high-frequency generator 180. The control unit 190 causes the high-frequency generator 180 to output a microwave at a predetermined low output before performing the heat treatment of the heating object 10, and the intensity of the reflected wave measured by the power meter 181 is less than or equal to a predetermined value. Thus, drive control (movement control) of the

drive mechanisms

171, 172, 173, and 174 is performed, and the positions of the mounting table 130, the plate 140, the antenna 150, and the reflection plate 160 are set to optimum positions.

And in the state which set each position of the mounting base 130, the plate 140, the antenna 150, and the reflecting plate 160 so that the intensity | strength of a reflected wave may become below a predetermined value, it is for heat processing to perform the heat processing of the heating target object 10. The high frequency generator 180 is driven by the output.

In addition, since the control part 190 drives the high frequency generator 180 only when the lid | cover 111 is closed, the sensor which detects the opening / closing state of the lid | cover 111 is provided, and it detects that the lid | cover 111 is closed by the sensor. Only in such a case, the high frequency generator 180 may be driven.

FIG. 2 is a characteristic diagram showing the intensity of the reflected wave of the microwave when the position of the antenna 150 and the position of the heating object 10 are changed. In FIG. 2, the horizontal axis indicates the frequency, and the vertical axis indicates the intensity of the reflected wave by the S11 parameter (dB).

FIG. 2A shows the distance between the antenna 150 and the mounting table 130 in a state where the heating object 10 is placed on the mounting table 130 and the positions of the mounting table 130, the plate 140, and the reflection plate 160 are fixed. The simulation result of the frequency characteristic of S11 parameter at the time of changing d1 is shown.

As shown in FIG. 2A, when the distance d1 is swung from 3.0 mm to 10 mm at intervals of 1.4 mm, the frequency at which the intensity of the reflected wave decreases as the distance d1 decreases is 2.4 GHz. Tended to be lower before and after the 2.5 GHz band (ISM band). In the band where the intensity of the reflected wave is low, the value of the S11 parameter is about −10 dB or less. In such a band, there is little reflection and impedance matching is achieved. From this, it was confirmed that when the antenna 150 was brought close to the mounting table 130 (moved upward), the band where the intensity of the reflected wave was low decreased.

FIG. 2B shows a case where the distance d2 between the mounting table 130 and the heating object 10 is changed with the positions of the mounting table 130, the plate 140, the antenna 150, and the reflection plate 160 fixed. The simulation result of the frequency characteristic of S11 parameter is shown. Changing the distance d2 is changing the gap of the gap between the mounting table 130 and the heating target 10.

As shown in FIG. 2 (B), when the distance d2 is swung to three points of 0 mm, 3 mm, and 9 mm, the frequency at which the intensity of the reflected wave decreases as the distance d2 becomes shorter is from 2.4 GHz to 2 mm. There was a tendency to be high before and after the band of 5 GHz. From this, it has confirmed that the zone | band where the intensity | strength of a reflected wave was low changed with the change of the position of the heating target object 10. FIG.

Here, although the simulation result when changing the position of the antenna 150 and the position of the heating target 10 with respect to the mounting table 130 has been described, when the mounting table 130 and the antenna 150 are fixed, the plate 140 is moved upward. It was confirmed that the band where the intensity of the reflected wave is low becomes higher. In addition, when the position of the plate 140 is fixed and the antenna 150 is brought closer to the plate 140, the band where the intensity of the reflected wave is low decreases, and when the antenna 150 is moved away from the plate 140, the band where the intensity of the reflected wave is low tends to increase. It could be confirmed.

From such a result, it is considered that even when the positions of the mounting table 130, the plate 140, and the reflecting plate 160 are moved, the band where the intensity of the reflected wave is low changes. For this reason, in the microwave heating apparatus 100, the efficiency of energy supply to the heating object 10 is improved by controlling the positions of the mounting table 130, the plate 140, the antenna 150, and the reflector 160.

FIG. 3 is a flowchart illustrating processing executed by the control unit 190 of the microwave heating apparatus 100 according to the first embodiment. When the switch for starting the heating process of the microwave heating apparatus 100 is operated, the control unit 190 repeatedly executes the process shown in FIG. 3 at a predetermined control cycle.

The control unit 190 causes the high frequency generator 180 to output a microwave at a predetermined low output (step S1). The predetermined low output is, for example, about 1/10 of the output during the heat treatment.

The control unit 190 acquires the intensity of the reflected wave measured by the power meter 181 (step S2).

The control unit 190 determines whether or not the intensity of the reflected wave is 50% or more of the intensity of the microwave output from the antenna 150 (step S3).

If the control unit 190 determines that the intensity of the reflected wave is 50% or more (S3: YES), the control unit 190 causes the high-frequency generator 180 to stop outputting the microwave (step S4). The high-frequency generator 180 is stopped in step S4 because the microwave is output at a predetermined low output in a state where the intensity of the reflected wave is relatively high, ie, 50% or more, while the mounting table 130 and the plate 140 are output in a later step S5. This is to avoid changing the position of the antenna 150 or the reflector 160.

The control unit 190 performs drive control (movement control) of the

drive mechanisms

171, 172, 173, or 174, and changes each position of the mounting table 130, the plate 140, the antenna 150, or the reflection plate 160 (step S5). When the process of step S5 ends, the flow returns to step S1.

Here, the control unit 190 first drives only the drive mechanism 172 to move only the position of the plate 140. When moving the position of the plate 140, the moving direction (upward or downward) and the moving distance may be determined in advance. The mounting table 130, the plate 140, the antenna 150, and the reflecting plate 160 are placed at a preset initial position before the start of the process shown in FIG.

If the control unit 190 determines in step S3 that the intensity of the reflected wave is not 50% or more (S3: NO), the intensity of the reflected wave is 10% or more of the intensity of the microwave output from the antenna 150. Whether or not (step S6).

If the control part 190 determines with the intensity | strength of a reflected wave being 10% or more (S6: YES), a flow will be advanced to step S5. As a result, in step S5, the control unit 190 performs drive control (movement control) of the

drive mechanisms

171, 172, 173, or 174 in a state where the microwave is output from the antenna 150 at a predetermined low output, Each position of the mounting table 130, the plate 140, the antenna 150, or the reflection plate 160 is changed.

If the intensity of the reflected wave is less than 50% and 10% or more, the intensity of the reflected wave is relatively low. Therefore, the mounting table 130 is in a state where the microwave is output from the antenna 150 at a predetermined low output. The position of the plate 140, the antenna 150, or the reflection plate 160 is changed.

Here, when the flow proceeds to step S5 through step S6, the control unit 190 first drives only the driving mechanism 172 to move only the position of the plate 140, thereby minimizing the intensity of the reflected wave. The plate 140 may be moved to the position.

Also, if the plate 140 has already been moved to a position where the intensity of the reflected wave is minimized while the processing of steps S1 to S5 is repeated before the flow proceeds to step S5 via step S6, Driving control (movement control) of the driving

mechanisms

171, 173, or 174 may be performed to change the positions of the mounting table 130, the antenna 150, or the reflecting plate 160.

In this case, while repeating the loop of steps S1, S2, S3, S6, and S5, in step S5, any one of the

drive mechanisms

171, 173, and 174 is moved so that the intensity of the reflected wave is increased. We will look for the position where it becomes the minimum. For this reason, the order in which the

drive mechanisms

171, 173, and 174 are moved one by one, the direction of movement, and the movement distance may be determined in advance.

If the control unit 190 determines that the intensity of the reflected wave is not 10% or more (S6: NO), the control unit 190 causes the high-frequency generator 180 to output a microwave over the time set by the user's operation with the output for heating. (Step S7). Thereby, the heat processing of the heating target object 10 are performed.

As described above, a series of processing shown in FIG. 3 is performed. Note that the numerical values in steps S3 and S6 are merely examples, and may be appropriately set to optimum values according to the size of the microwave heating apparatus 100, the output of the microwave, or the like.

As described above, the microwave heating apparatus 100 performs drive control (movement control) of the

drive mechanisms

171, 173, or 174 before performing the heat treatment of the heating object 10, and places the mounting table 130, the plate 140, and the antenna. 150 or the position of the reflector 160 is changed.

When the position of the mounting table 130, the plate 140, the antenna 150, or the reflector 160 is changed, the impedance viewed from the antenna 150 becomes more matched, and the intensity of the reflected wave of the microwave can be reduced.

Therefore, it is possible to provide a microwave heating apparatus 100 with improved energy supply efficiency to the heating object 10 and a method for controlling the microwave heating apparatus 100.

Particularly, by moving the position of the plate 140, the energy supply efficiency to the heating object 10 can be greatly improved. The plate 140 is disposed between the antenna 150 and the mounting table 130, and the microwave radiated from the antenna 150 is transmitted through the plate 140 and radiated to the heating object 10 placed on the mounting table 130.

Since the plate 140 has a dielectric constant larger than that of the mounting table 130, the impedance viewed from the antenna 150 changes greatly when the position is moved. Such a plate 140 has an effect as a radio wave lens for adjusting the wavelength and phase of the microwave.

Therefore, by moving the position of the plate 140 to reduce the intensity of the reflected wave of the microwave, the microwave heating device 100 that improves the efficiency of energy supply to the object to be heated, and the control of the microwave heating device 100 A method can be provided. Further, if the position of the mounting table 130, the antenna 150, or the reflection plate 160 is changed in addition to the plate 140, the intensity of the reflected wave of the microwave can be further reduced.

As described above, by changing the position of the plate 140, or by changing the position of the mounting table 130, the antenna 150, or the reflector 160 in addition to the plate 140, the dielectric constant of the heating object 10, etc. Accordingly, the heat treatment can be performed with the energy supply efficiency optimized.

<Embodiment 2>
FIG. 4 is a diagram illustrating the microwave heating apparatus 200 according to the second embodiment. In FIG. 4, similarly to FIG. 1 of the first embodiment, the internal configuration of the microwave heating apparatus 200 is transparently shown, and an XYZ coordinate system is defined.

The microwave heating apparatus 200 has a configuration in which a temperature sensor 201 is added to the microwave heating apparatus 100 of Embodiment 1 and the control unit 190 is replaced with a control unit 290. For this reason, the same code | symbol is attached | subjected to the same component and the description is abbreviate | omitted.

The temperature sensor 201 is provided on the lower surface of the lid 111 and measures the temperature of the heating object 10. This is for monitoring whether the heating object 10 is heated by the microwave. As the temperature sensor 201, for example, a sensor including a thermocouple or a resistance temperature detector may be used. The temperature sensor 201 is connected to the control unit 290, and a signal indicating temperature is input to the control unit 290. The temperature sensor 201 is an example of a first temperature sensor.

The control unit 290 performs drive control (movement control) of the

drive mechanisms

171, 172, 173, and 174 and drive control of the high-frequency generator 180. Before performing the heat treatment, the control unit 290 is configured so that the intensity of the reflected wave of the microwave is equal to or lower than a predetermined value and the change in temperature detected by the temperature sensor 201 is equal to or higher than the predetermined value. Drive control (movement control) of the

drive mechanisms

171, 172, 173, 174 is performed, and the positions of the mounting table 130, the plate 140, the antenna 150, and the reflection plate 160 are set to optimum positions.

The mounting table 130, the plate 140, the antenna 150, and the reflecting plate 160 are adjusted so that the intensity of the reflected wave is equal to or lower than a predetermined value and the change in temperature detected by the temperature sensor 201 is equal to or higher than the predetermined value. In a state where each position is set, the high frequency generator 180 is driven with an output for heat treatment to heat the heating object 10.

FIG. 5 is a flowchart illustrating a process executed by the control unit 290 of the microwave heating apparatus 200 according to the second embodiment. The flowchart shown in FIG. 5 is obtained by adding steps S26A and S26B to the flowchart shown in FIG. For this reason, it demonstrates centering around difference here. The process of step S26A is performed after step S6.

If the control unit 290 determines in step S6 that the intensity of the reflected wave is not 10% or more (S6: NO), the control unit 290 acquires temperature data measured by the temperature sensor 201 (step S26A).

Next, the control unit 290 determines whether or not the change in temperature is equal to or lower than a predetermined temperature using the temperature data acquired in step S26A (step S26B).

When the processing shown in FIG. 5 is repeatedly executed in a predetermined control cycle, the temperature change is acquired by the temperature acquired in the previous step S26A and the current (current control cycle) step S26A. It is the difference from temperature.

In the determination processing in step S26B, when the intensity of the reflected wave of the microwave is less than 10%, the intensity of the reflected wave is low in a state where the heating object 10 is irradiated with a predetermined low output microwave. However, it is the process performed in order to determine whether it is the state which cannot heat the heating target object 10 efficiently.

When the control unit 290 determines that the temperature change is equal to or lower than the predetermined temperature (S26B: YES), the control unit 290 advances the flow to step S4. Even if the intensity of the reflected wave is low, the state in which the object to be heated 10 is not efficiently heated is a state in which the efficiency of energy supply to the object to be heated 10 is not improved, and therefore the output of the microwave Is stopped, and the position control in step S5 is performed again.

If the controller 290 determines that the change in temperature is not less than or equal to the predetermined temperature (S26B: NO), the flow proceeds to step S7. Since the intensity of the reflected wave is low and the heating object 10 can be efficiently heated, the heating object 10 is heated by switching to the output for the heating process.

As described above, the microwave heating apparatus 200 reduces the intensity of the reflected wave of the microwave and confirms that the energy supply efficiency to the heating object 10 is in a good state before performing the heat treatment. It can be carried out.

Therefore, it is possible to provide a microwave heating apparatus 200 that improves the efficiency of energy supply to the heating object 10 and a method for controlling the microwave heating apparatus 200.

In addition, the form which detects the temperature of the heating target object 10 with the temperature sensor 201, and confirms that the supply efficiency of the energy to the heating target object 10 is a favorable state was demonstrated here.

However, by changing the position and / or configuration of the temperature sensor 201 or using a temperature sensor different from the temperature sensor 201, the temperature of the heating chamber, the mounting table 130, or the antenna 150 is measured, When the change in temperature of the mounting table 130 or the antenna 150 is equal to or higher than the predetermined temperature, the position control in step S5 may be performed again. The state in which the heating chamber, the mounting table 130, or the antenna 150, which is a part other than the heating object 10 that is originally desired to be heated, is heated is not a state in which the energy supply efficiency to the heating object 10 is good. is there. Note that the temperature sensor that measures the temperature of the heating chamber, the mounting table 130, or the antenna 150 in this way is an example of a second temperature sensor.

The microwave heating apparatus and the method for controlling the microwave heating apparatus according to the exemplary embodiments of the present invention have been described above, but the present invention is not limited to the specifically disclosed embodiments. Various modifications and changes can be made without departing from the scope of the claims. Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A heating chamber;
A mounting table disposed in the heating chamber and on which a heating object is mounted;
A dielectric plate-like member disposed under the mounting table in the heating chamber;
An antenna disposed under the plate-like member in the heating chamber and radiating microwaves;
A first moving mechanism for moving the plate-like member up and down;
An intensity measuring unit that measures the intensity of the reflected wave of the microwave via the antenna;
A control unit that controls the movement of the first moving mechanism based on the intensity measured by the intensity measuring unit and moves the plate-like member to a first position where the intensity is equal to or less than a predetermined intensity. Heating device.
(Appendix 2)
A first temperature measuring unit for measuring the temperature of the heating object;
Based on the intensity measured by the intensity measurement unit and the temperature measured by the first temperature measurement unit, the control unit decreases the intensity and increases the temperature of the heating object. As described above, the microwave heating apparatus according to appendix 1, which performs movement control of the first movement mechanism.
(Appendix 3)
A second temperature measuring unit that is disposed in the heating chamber and measures the temperature of the heating chamber, the mounting table, or the antenna;
The controller controls the movement of the first moving mechanism so that the temperature of the heating chamber, the mounting table, or the antenna is equal to or lower than a predetermined temperature based on the temperature measured by the second temperature measuring unit. The microwave heating apparatus according to Supplementary Note 1 or 2, wherein:
(Appendix 4)
A second moving mechanism for moving the mounting table or the antenna up and down,
In addition to the first movement mechanism, the control unit performs movement control of the second movement mechanism based on the intensity measured by the intensity measurement unit, and a first position where the intensity is equal to or less than the predetermined intensity; The microwave heating device according to any one of appendices 1 to 3, wherein the plate member and the mounting table or the antenna are respectively moved to a second position.
(Appendix 5)
The microwave heating device according to any one of appendices 1 to 4, wherein a dielectric constant of the plate member is higher than a dielectric constant of the mounting table.
(Appendix 6)
A reflector that is disposed under the antenna in the heating chamber and reflects microwaves;
A third moving mechanism for moving the reflecting portion up and down;
Based on the intensity measured by the intensity measurement unit and the temperature measured by the first temperature measurement unit, the control unit decreases the intensity and increases the temperature of the heating object. As described above, the microwave heating apparatus according to any one of appendices 1 to 5, which performs movement control of the third movement mechanism.
(Appendix 7)
A heating chamber;
A mounting table disposed in the heating chamber and on which a heating object is mounted;
A dielectric plate-like member disposed under the mounting table in the heating chamber;
An antenna for radiating microwaves, and a first moving mechanism for moving the plate member up and down, disposed under the plate member in the heating chamber;
A method for controlling a microwave heating apparatus, comprising: an intensity measurement unit that measures the intensity of a reflected wave of microwaves via the antenna;
A method for controlling a microwave heating apparatus, wherein movement control of the first moving mechanism is performed based on an intensity measured by the intensity measuring unit, and the plate member is moved to a first position where the intensity is equal to or less than a predetermined intensity. .

DESCRIPTION OF SYMBOLS 100 Microwave heating apparatus 110 Case 120 Base 130 Mounting stand 140 Plate 150 Antenna 160 Reflecting

plate

171, 172, 173, 174 Drive mechanism 180 High frequency generator 181 Power meter 190 Control part 200 Microwave heating apparatus 201 Temperature sensor 290 Control part

Claims

A heating chamber;
A mounting table disposed in the heating chamber and on which a heating object is mounted;
A dielectric plate-like member disposed under the mounting table in the heating chamber;
An antenna disposed under the plate-like member in the heating chamber and radiating microwaves;
A first moving mechanism for moving the plate-like member up and down;
An intensity measuring unit that measures the intensity of the reflected wave of the microwave via the antenna;
A control unit that controls the movement of the first moving mechanism based on the intensity measured by the intensity measuring unit and moves the plate-like member to a first position where the intensity is equal to or less than a predetermined intensity. Heating device.
A first temperature measuring unit for measuring the temperature of the heating object;
Based on the intensity measured by the intensity measurement unit and the temperature measured by the first temperature measurement unit, the control unit decreases the intensity and increases the temperature of the heating object. The microwave heating apparatus according to claim 1, wherein the movement control of the first moving mechanism is performed.
A second temperature measuring unit that is disposed in the heating chamber and measures the temperature of the heating chamber, the mounting table, or the antenna;
The controller controls the movement of the first moving mechanism so that the temperature of the heating chamber, the mounting table, or the antenna is equal to or lower than a predetermined temperature based on the temperature measured by the second temperature measuring unit. The microwave heating apparatus of Claim 1 or 2 which performs.
A second moving mechanism for moving the mounting table or the antenna up and down,
In addition to the first movement mechanism, the control unit performs movement control of the second movement mechanism based on the intensity measured by the intensity measurement unit, and a first position where the intensity is equal to or less than the predetermined intensity; The microwave heating device according to any one of claims 1 to 3, wherein the plate member and the mounting table or the antenna are moved to a second position, respectively.
The microwave heating device according to any one of claims 1 to 4, wherein a dielectric constant of the plate member is higher than a dielectric constant of the mounting table.
A reflector that is disposed under the antenna in the heating chamber and reflects microwaves;
A third moving mechanism for moving the reflecting portion up and down;
Based on the intensity measured by the intensity measurement unit and the temperature measured by the first temperature measurement unit, the control unit decreases the intensity and increases the temperature of the heating object. As described above, the microwave heating apparatus according to claim 1, wherein the movement control of the third moving mechanism is performed.
A heating chamber;
A mounting table disposed in the heating chamber and on which a heating object is mounted;
A dielectric plate-like member disposed under the mounting table in the heating chamber;
An antenna for radiating microwaves, and a first moving mechanism for moving the plate member up and down, disposed under the plate member in the heating chamber;
A method for controlling a microwave heating apparatus, comprising: an intensity measurement unit that measures the intensity of a reflected wave of microwaves via the antenna;
A method for controlling a microwave heating apparatus, wherein movement control of the first moving mechanism is performed based on an intensity measured by the intensity measuring unit, and the plate member is moved to a first position where the intensity is equal to or less than a predetermined intensity. .