JPH09306664A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To put an object to be heated into the desired finished condition by confirming the position of an electromagnetic wave emitting means provided in a heating chamber, and controlling the determined position by a control means. SOLUTION: A high frequency heating device is equipped in its heating chamber 1 with an electromagnetic wave emitting means 4 to emit electromagnetic waves 3, and therewith an object placed 2 as food is heated. Whether the position of this emitting means 4 is correct, is made sure by a position check means 5, and the position is controlled by a control means 6 so as to be the best for the desired heating distribution. In this condition, the electromagnetic waves emitted from a magnetron 7 are introduced into the heating chamber 1 by a radiation antenna 9 via a waveguide tube 12 and a coupling part 13 to constitute a waveguide means 8, and the food 2 is heated. The radiation antenna 9 is rotated by a stepping motor 10. The control means 6 controls the output of the magnetron 7 and the drive of stepping motor 10, and controls the rotation and stop of the radiation antenna 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating apparatus equipped with an electromagnetic wave radiating means for changing the dielectric heating distribution of an object to be heated by electromagnetic waves.

[0002]

2. Description of the Related Art A microwave oven, which is a typical high-frequency heating device, has conventionally been constructed as shown in FIGS.

The microwave oven of FIG. 34 has a turntable 16
It is a general configuration using. Here, the electromagnetic wave emitted from the magnetron 7 as the electromagnetic wave generating means is transmitted to the waveguide 12
Are distributed through the heating chamber 1 as standing waves determined by the shape of the heating chamber 1 and the position of the opening 71 through which electromagnetic waves are radiated. Then, heat is generated according to the electric field component of the electromagnetic wave given to each part of the food 2 and the dielectric loss of each part. The electric power P [W / m ³ ] absorbed per unit volume of food is the strength E [V / m] of the applied electric field, the frequency f [Hz],
And the relative permittivity εr and the dielectric loss tangent tanδ of the food 2 are expressed as the equation (1). In this conventional example, the heating distribution of the food 2 is generally determined by the standing wave distribution of electromagnetic waves,
In order to suppress the uneven heating distribution, the turntable 16 is rotationally driven to make the heating distribution on a concentric circle uniform.

P = (5/9) εr · tanδ · f · E ² × 10 ⁻¹⁰ [W / m ³ ] (1) Further, as disclosed in JP-A-7-198147, a plurality of openings are switched. There is something that changes the heating distribution. FIG.
In FIG. 5 and FIG. 36, 20 waveguides 12 are arranged in a matrix form outside the bottom surface of the heating chamber, and the power supply to each waveguide 12 is selectively controlled. Which waveguide is to be supplied with power is controlled by the temperature detecting means 72 for detecting the local temperature in the heating chamber 1, and 20 mirrors 73 are provided vertically above each opening 71. Infrared rays are guided to the five sets of temperature detecting means 72 via the five sets of concave mirrors 74. In addition, in FIGS. 37 and 38, the opening 75 is shown in FIG.
It has a configuration in which the heating point is moved by rotatably moving around 6 and is combined with the turntable 16 to locally heat. Turntable 1 by controlling the position of opening 75
The heating points 6 in the radial direction are arbitrarily changed, and the rotation of the turntable 16 is controlled to arbitrarily change the heating points in the circumferential direction.

Further, as disclosed in Japanese Patent Application Laid-Open No. 7-161469, an opening is rotated while detecting a rotational position. In this conventional example, as shown in FIGS. 39 to 42, an annular rectangular waveguide 77 and an opening 7 whose position is changed by rotation.
8, motors 79 and 80, rotary shafts 81 and 82, and a rotation angle detector (absolute rotary encoder) 8
3, the rotation angle, that is, the rotation position of the opening 78 can be detected.

[0006]

However, in the above-mentioned conventional structure, when the waveguide and the heating chamber are connected and electromagnetic waves are introduced into the heating chamber, an appropriate opening for making the heating distribution uniform for each material and shape of the food. There is a problem that the positions of the portions are different, and it is not possible to uniformly heat all foods with one opening.

[0007] For example, it is generally known that when flat foods are heated in a conventional microwave oven, the heating proceeds from the edge and remarkable uneven heating occurs in which the center remains cold. As an example, as shown in FIG. 43, water is placed in an acrylic container 84 that is flat and divided into 5 × 5 cells and heated in a conventional microwave oven (the opening is at the back). Is shown in FIG. 44 (a). Since the shape of the container 84 is such that it fits in the heating chamber and cannot rotate, the container was heated at a position slightly higher than the turntable. Since the position of the opening is at the back, it can be seen that the temperature rise at the back side is higher. Fig.44 (b) is the processed data of Fig.44 (a), which averages the temperature rise of the masu at the target position (equal distance from the center) centering on the center masu. This is based on the assumption of averaging by rotation. From this result, as described above, it can be seen that the heating proceeds from the edge, and that the center has cold uneven heating.

Further, as a characteristic of the position of the opening, when the opening is provided near the center of the bottom of the heating chamber, the bottom of the food is heated, and if it is a liquid food with convection, it can be heated uniformly, but there is no convection. The solid food has a problem that the temperature rises only at the bottom. At this time, if a turntable is used, the heating distribution on the concentric circles can be made uniform, but no matter how much the turntable is rotated, the radial distribution and the vertical distribution seen from the center of rotation are not improved.

On the other hand, as shown in FIG. 35 and FIG. 36, in which the radiation position is emphasized rather than the standing wave and the radiation position of the electromagnetic wave from the lower side close to the food is controlled, the arbitrary position of the food is determined by the radiation position. It can be heated locally. However, there is a problem that a large number of waveguides 12 are required and the configuration for switching the power supply to each waveguide 12 becomes complicated.

Further, there is a problem that it is impossible to heat the space between two adjacent openings and the space between the four openings 71.

Further, as shown in FIGS. 37 to 42, the openings 75 and 7 are formed by the annular rectangular waveguide 77 and the annular waveguide 85.
When changing the position of 8, the excitation position can be changed continuously. However, there is a problem in that the annular rectangular waveguide 77 and the annular waveguide 85 have a large space and the configuration becomes complicated. According to FIG. 38, since the turntable 16 occupies a small proportion of the heating chamber, there is a problem that the space for placing food is limited. Further, there is a problem that other parts such as the bottom heater cannot be formed because the annular waveguide 85 interferes.

35 to 39, when food juice or water is spilled in the heating chamber, it enters the waveguide 12, the annular rectangular waveguide 77 or the annular waveguide 85 to concentrate the electric field. However, there is a problem in that the drive may be stopped or the drive part may be clogged to stop the drive.

Further, in FIGS. 40 and 42, the rotational position of the opening 78 can be detected by the rotation angle detector 83, and the position of the opening 78 can be controlled with high accuracy. But the side openings 7
Since it is excited from 8, there is a distance until the electromagnetic wave reaches the food 2, and the electromagnetic wave diffuses. The degree of this diffusion greatly changes depending on the change in the distance from the opening 78 to the food 2 depending on how the food 2 is placed, and the heated portion cannot be specified. Therefore, it is not possible to heat only the target area. Therefore, there is a problem that the effect is small even if the position of the opening 78 is accurately controlled by the rotation angle detector 83. In addition, when the electromagnetic waves are diffused, they collide with various portions other than food (portions that should not be heated, such as the wall of the heating chamber), causing a loss, and there is a problem that the heating efficiency is deteriorated. In addition, when a plurality of different types of foods are put, it is not possible to select and heat any one of them, and electromagnetic waves collide with all of them, causing light or low-density foods and dielectric loss (relative permittivity and There is a problem that the temperature of a material having a large dielectric tangent increases first.

Since an absolute rotary encoder is used as the rotation angle detector 83, the number of bits must be increased in order to improve the accuracy of position (angle) detection, and the number of wirings is the number corresponding to the number of bits. Therefore, there is a problem that the configuration related to control becomes complicated and the cost becomes high.

[0015]

In order to solve the above-mentioned problems, the present invention has an electromagnetic wave radiating means for radiating an electromagnetic wave to heat an object to be heated in a heating chamber, and the position confirming means positions the electromagnetic wave radiating means. And the position of the electromagnetic wave emission means is controlled by the control means.

According to the above invention, since the electromagnetic wave radiating means can be accurately controlled to a desired position, the object to be heated can be brought into a desired finished state.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention confirms the position of a movable electromagnetic wave radiating means for radiating electromagnetic waves into a heating chamber in order to obtain a desired finished state of an object to be heated. The control is performed so that the position can be obtained.

Further, an electromagnetic wave emitting means for emitting an electromagnetic wave into the heating chamber to heat an object to be heated, a position confirming means for confirming the position of the electromagnetic wave emitting means, and a control means for controlling the position of the electromagnetic wave emitting means are provided. Be prepared.

Since the electromagnetic wave radiating means can be accurately controlled to a desired position, the object to be heated can be brought into a desired finished state.

Further, the position confirmation means is configured to confirm the position of the electromagnetic wave emission means when the power is turned on.

Even when the device is used after the power supply is removed and inserted, the electromagnetic wave radiating means can be accurately controlled to a desired position without being placed in an indefinite position.

Further, the position confirmation means is configured to confirm the position of the electromagnetic wave emission means after the completion of cooking.

Also, when another cooking is performed after the completion of cooking, the electromagnetic wave radiating means can be accurately controlled to a desired position without being in an indefinite position.

Further, it has an opening / closing means for opening / closing the heating chamber and an opening / closing detecting means for detecting a change of the opening / closing means from open to closed or from closed to open, and the position confirming means opens or closes by the open / close detecting means. The position of the electromagnetic wave emitting means is confirmed after the detection of closing.

Even when the user opens / closes the opening / closing means during cooking, the electromagnetic wave radiating means can be accurately controlled to a desired position without being placed in an indefinite position.

The position confirming means has a reference position detecting means for detecting that the electromagnetic wave radiating means has reached a reference position, and the control means uses the electromagnetic wave based on a signal from the reference position detecting means. The configuration is such that the position of the radiation means is controlled.

Further, the position confirming means is configured to have a stopping means for stopping the electromagnetic wave emitting means at a reference position.

Since the position of the electromagnetic wave emitting means is confirmed and controlled at the reference position, the positional deviation can be corrected.

Further, the position confirmation means is configured to confirm the position of the electromagnetic wave emission means at the position where heating is started.

Then, the heating can be started immediately after the position confirmation. Further, the control means is configured such that the position of the electromagnetic wave emitting means at the start of heating is always constant and the position of the electromagnetic wave emitting means is changed midway.

The object to be heated can make the heating distribution constant from the start of heating to the middle.

Further, the control means is configured to control the position of the electromagnetic wave radiating means so that the heating distribution is such that substantially the center of the bottom surface of the object to be heated is heated at the start of heating.

It is possible to prevent the bottom center of the object to be heated from being insufficiently heated. The electromagnetic wave radiating means has an output control means for controlling an electromagnetic wave output, and the output control means sets the electromagnetic wave output to 0 when the position confirmation means confirms the position of the electromagnetic wave emission means. The configuration is such that it is controlled to decrease.

Since the generation of electromagnetic waves when confirming the position is suppressed, it is possible to prevent uneven heating and unnecessary power consumption during position confirmation.

The electromagnetic wave radiating means includes an electromagnetic wave generating means for generating an electromagnetic wave, a wave guiding means for guiding the electromagnetic wave from the electromagnetic wave generating means into the heating chamber, and a radiating means for radiating the electromagnetic wave guided by the wave guiding means. And driving means for driving the radiating means, the heating distribution of the object to be heated changes depending on the position of the radiating means, and the position confirming means confirms the position of the radiating means or the position of the driving means. The control means is configured to control the position of the radiation means by controlling the drive means.

Since the radiating means can be accurately controlled to the desired position by the driving means, the object to be heated can be brought into a desired finished state.

Further, the physical quantity detecting means for detecting the physical quantity of the object to be heated is provided, and the control means is configured to control the position of the electromagnetic wave emitting means by the physical quantity detecting means.

Since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the physical quantity of the object to be heated, the object to be heated can be brought into an appropriate finished state.

Further, the physical quantity detecting means is constituted by temperature distribution detecting means for detecting the temperature distribution of the object to be heated.

Since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the temperature distribution of the object to be heated, the object to be heated can be brought into an appropriate finished state.

The physical quantity detecting means is constituted by a weight detecting means for detecting the weight of the object to be heated.

Since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the weight of the object to be heated, the object to be heated can be brought into an appropriate finished state.

Further, the user has a setting means for setting at least one of the name, type and state before heating of the object to be heated or the heating method or the heating finish state, and the control means uses the setting means. It is configured to control the position of the electromagnetic wave emitting means.

Since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the user's setting, the object to be heated can be brought into a desired finished state.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram of a high-frequency heating apparatus according to Embodiment 1 of the present invention.

In FIG. 1, in order to heat the object 2 to be heated in the heating chamber 1 to a desired finished state, the electromagnetic wave emitting means 4 for emitting the electromagnetic wave 3 into the heating chamber 1 and the position of the electromagnetic wave emitting means 4 are shown. It has a position confirming means 5 in the heating chamber for confirming whether it is correct and a control means 6 for controlling the position of the electromagnetic wave emitting means 4 to an appropriate position for a desired heating distribution.

Here, the electromagnetic wave radiating means 4 of the present invention may be any one as long as the electromagnetic wave distribution in the heating chamber changes depending on the position. For example, moving the means for generating electromagnetic waves such as magnetron or semiconductor oscillation, moving the radiating antenna, moving dielectrics or metals in the heating chamber (similar to a stirrer), or the waveguide itself. There are those that move, those that move the dielectric or metal inside the waveguide, and those that open and close (or deform) at least part of the opening of the waveguide that radiates electromagnetic waves. It is not limited to only.
If the electromagnetic wave distribution in the heating chamber changes depending on the position, the heating distribution (finished state) can be changed by checking the position and controlling the position appropriately.

(Second Embodiment) FIG. 2 is a block diagram of a high frequency heating apparatus according to a second embodiment of the present invention.

In FIG. 2, an electromagnetic wave emitting means 4 includes an electromagnetic wave generating means 7 for generating an electromagnetic wave 3a, a wave guiding means 8 for receiving the electromagnetic wave 3a from the electromagnetic wave generating means 7 and guiding the electromagnetic wave 3a into the heating chamber 1, and a wave guiding means. Electromagnetic wave 3 guided into heating chamber 1 by 8
Radiating means 9 which receives b and actually radiates it as an electromagnetic wave 3c
Then, the radiation means 9 is driven by the control means 6 and the object to be heated 2
It has a driving means 10 for changing the heating distribution of. Further, the position confirmation means 5 confirms the position of the radiation means 9 in the heating chamber 1.

Here, the radiating means means a means for radiating an electromagnetic wave by placing an electric field on a conductor (a radiating antenna), and an electromagnetic wave trapped in a closed space is radiated from an opening (or an exciting port or a power feeding port). It is defined as something different from (waveguide).

(Embodiment 3) FIG. 3 is a block diagram of essential parts of a high-frequency heating apparatus according to Embodiment 3 of the present invention.

In FIG. 3, the position confirmation means 5 is a stop means 11 for stopping the electromagnetic wave emission means 4 at a reference position.
The control means 6 forcibly stops the electromagnetic wave radiation means 4 even if the control means 6 tries to move the electromagnetic wave radiation means 4 further. Therefore, it can be said that the position confirmation means 5 actively confirms the position of the electromagnetic wave emission means 4 by the stop means 11.

(Embodiment 4) FIGS. 4 to 9 are sectional structural views of a microwave oven which is a typical high-frequency heating apparatus according to Embodiment 4 of the present invention.

In FIG. 4, in the electromagnetic wave emitting means 4, the electromagnetic wave emitted from the magnetron 7 which is a typical electromagnetic wave generating means is coaxial with the waveguide 12 and the waveguide 12 which constitute the typical waveguide means 8. The food is radiated into the heating chamber 1 by the radiating antenna 9 which is a typical radiating means through the coupling part 13 which is coupled to heat the food 2 which is a typical object to be heated. In addition, a holding portion 14 that holds the coupling portion 13 with the waveguide 12, and a stepping motor 10 that is a typical driving unit that fits the coupling portion 13 and rotationally drives the coupling portion 13 and the radiation antenna 9 are configured. are doing.

Inside the heating chamber 1, in order to place the food 2 and rotate it during heating, there are provided a glass or ceramic dish 15 through which electromagnetic waves are transmitted and a turntable 16, and the radiation antenna 9 is not used. A projecting portion 17 formed by projecting a part of the wall surface to the outside of the heating chamber 1 for occasional storage.
Is composed.

Outside the heating chamber 1, a turntable motor 18 for rotating the turntable 16, a weight detection means 19 for determining the weight of the food 2, a heater for radiantly heating the food 2 during oven cooking or grill cooking. 20, food 2
The temperature distribution detecting means 21 for detecting the temperature distribution of the above, the setting means 22 for the user to set and input, and the control means 6. Here, the setting means 22 allows the user to input information about the name of the food 2 (for example, "milk", "liquor", etc.), information about the type of the food 2 (for example, "root vegetables", "leaf vegetables", etc.), before heating. Depending on whether you enter or select information about the state of the product (eg initial temperature or storage condition), heating method (eg “strong”, “weak” etc.) or heating finish condition (eg “defrost”, “warm” etc.) It is something to set. Further, the control means 6 includes an output control means 23 for controlling the electromagnetic wave output from the magnetron 7, an antenna control means 24 for controlling the rotation and stop of the radiation antenna 9 by controlling the stepping motor 10, and the turntable motor 1.
8 has a table control means 25 for controlling the rotation and stop of the turntable 16 and the like, and the weight detection means 1
9, the temperature distribution detecting means 21 and the setting means 22 and the like control.

FIG. 5 shows a cross section taken along the line AA 'in FIG. FIG.
, The electromagnetic wave radiated from the radiating portion 26 of the magnetron 7 is transmitted in the waveguide 12 at the guide wavelength λ _g , and the electric field at the radiating portion 26 is strong, and the electric field is strong and weak every λ _g / 4 (abdominal node). It becomes a standing wave that repeats. Also, by the connecting portion 13,
In order to efficiently guide the electromagnetic wave in the waveguide 12 to the protruding portion 17, the distance L ₁ from the radiation portion 26 to the coupling portion 13 is m · λ _g.
/ 2 (where m is an integer of 0 or more). Further, in order to weaken the electric field at the end face 27 of the waveguide 12, the coupling portion 1
The distance L ₂ from 3 to the end face 27 is (2n + 1) · λ _g / 4
(However, n is an integer of 0 or more).

6 to 8 are sectional views taken along the line BB 'of FIG.
In FIG. 6, the radiation antenna 9 radiates the electromagnetic wave transmitted from the coupling portion 13 into the heating chamber 1, and the radiation direction of the electromagnetic wave has a strong directivity in the longitudinal direction of the radiation antenna 9. The position of the radiating antenna 9 is the solid arrow 2
The position can be changed within the range of 8a and 28b, and the positioning is driven by the stepping motor 10. The position of the radiation antenna 9 in FIG. 6 is a position facing the rotation axis 29 of the turntable 16, and is the most in the driving range of the radiation antenna 9 in the heating chamber 1.
It has a strong directivity in the central direction of the bottom surface. At this time, the radiation antenna 9 is located close to the food 2 on the turntable 16 and can centrally heat the bottom center of the food 2.

In FIG. 7, the position of the radiating antenna 9 is the position facing the corner of the heating chamber 1, and has the strongest directivity in the circumferential direction of the heating chamber 1 in the driving range of the radiating antenna 9. At this time, the radiation antenna 9 is located at a position apart from the food 2 on the turntable 16 and can diffuse the electromagnetic waves to heat the food 2 from the surroundings.

In FIG. 8, the radiating antenna 9 is driven clockwise by the stepping motor 10 as viewed from FIGS. 6 to 8 (direction of solid arrow 28a in FIG. 6), but a stopper 30 which is a typical stopping means. Since it cannot be driven any more due to hitting, it is held at this position (reference position). At this time, the antenna control means 24 drives the radiating antenna 9 clockwise by the stepping motor 10 as viewed from FIGS. 6 to 8 (direction of a solid arrow 28a in FIG. 6) and is sufficiently larger than the driving range of the radiating antenna 9. By controlling to drive the range, the radiation antenna 9 can be stopped at the reference position at any time. Therefore, the stopper 30
Can be said to be a stopping means and a position confirming means for confirming that the radiation antenna 9 is at the reference position.

Further, since the heating distribution of food varies greatly depending on the position of the radiation antenna 9, the position of the radiation antenna 9 must be controlled accurately. Therefore, in this embodiment, the radiating antenna 9 is once driven to the reference position, and then the direction is reversed (counterclockwise) to the aimed position and stopped.

Further, by stopping the radiation antenna 9 at the reference position, the entire radiation antenna 9 is stored in the projecting portion 17. In the present embodiment, when the radiation antenna 9 is located in the heating chamber 1 when it is an obstacle (for example, when only the heater 20 wants to heat or when the user cleans the heating chamber 1), the radiation antenna 9 is used. It is stored in the protrusion 17 so as not to get in the way.

FIG. 9 shows a cross section taken along the line CC ′ of FIG. In FIG. 9, the radiating antenna 9 has a concentrating portion 31 that is curved to concentrate the electric field, and is curved so that the portion from the concentrating portion 31 to the tip 32 is located above. Therefore, the electric field generated from the concentrated portion 31 to the tip 32 is easily transmitted upward, and the directivity is increased. For example, when the radiation antenna 9 is located at a position as shown in FIG. 6, the vertical distance from the concentrating portion 31 to the object to be heated becomes closer to the tip 32, so that the object to be heated can be more intensively heated.

Further, since the radiating antenna 9 is long, the position of the tip 32 in the height direction fluctuates and tends to fluctuate only by holding it by the holding portion 14. Therefore, a spacer 33 for holding the radiation antenna 9 is configured on the bottom surface of the heating chamber 1, and when the radiation antenna 9 is driven, the position in the height direction is regulated while sliding on the spacer 33 to suppress fluctuation. .

The control means 6 will be further described below.
In the present embodiment, the table control means 25 rotates the turntable 16 at a constant level to make the heating distribution on a concentric circle centered on the rotation axis 29 uniform. When the turntable 16 makes a constant rotation, the portion where the electromagnetic waves are concentrated changes in the radial direction of the turntable 16 depending on the position of the radiating antenna 9. Therefore, it is necessary to continuously switch from the bottom concentrated heating to the peripheral distributed heating. You can

This is not the case when the food 2 is locally heated or when a plurality of foods are simultaneously placed and selectively heated therein. For example, when heating the Makunouchi bento, one container contains foods to be heated such as rice and foods to be eaten at a low temperature such as raw vegetables, sashimi and pickles. In this case, it is desirable that the rice and the raw vegetables, sashimi and pickles are placed in the heating chamber as they are without being separated and only the rice is heated. Turntable 16
The part you want to heat locally (eg rice) while rotating
Turntable 1 when is directly above the radiating antenna 9
It is possible to intensively heat only that portion by a method such as stopping 6 or reducing the rotation speed. This method has an effect that local heating and selective heating can be performed, and that wasteful heating is not performed and energy loss is prevented.

There is a method in which the output control means 23 obtains the same effect as shifting the turntable 16 by the table control means 25. While the turntable 16 is being rotated at a constant speed, the magnetron 7 may be stopped from oscillating in a time zone in which a portion to be locally heated is located away from the radiation antenna 9 so that electromagnetic waves are not allowed to enter the heating chamber 1. . However, in this case, it takes a long time to finish heating.

Further, the temperature distribution detecting means 21 detects the temperature of the food 2 through the opening 34 on the wall surface of the heating chamber 1 to detect the heating distribution. The structure of the temperature distribution detecting means 21 itself will be described. As a general temperature distribution detecting means 21 that detects the temperature in a non-contact manner, there is an infrared sensor that converts the amount of infrared rays emitted from the food 2 into an electric signal. As the infrared sensor, there are a thermopile type having a hot contact and a cold contact inside, and a pyroelectric type having a chopper, and either one may be adopted in the present invention.

(Fifth Embodiment) Referring to FIGS. 10 to 13, a temperature distribution detecting means 21 of a microwave oven according to a fifth embodiment of the present invention.
Then, the operation of the control means 6 by the temperature distribution detection means 21 will be described.

FIG. 10 is a sectional view showing the structure of a main part of a microwave oven. An opening 34 is provided on the wall surface of the heating chamber 1, and two types of metal plates 35a and 35b form a choke structure that prevents electromagnetic waves. Reference numeral 35a denotes an optical path, which is a cylindrical metal part having a spread on the wall surface and is in close contact with the wall surface. 35
Reference numeral b is a box-shaped metal part having a small hole 36, which is in close contact with the wall surface. The heating chamber 1 is formed by the choke structures 35a and 35b.
Infrared rays come out from the inside through the small holes 36, but electromagnetic waves in the heating chamber 1 are blocked and hardly leak outside. FIG.
At L, the dimension L is designed to be λ / 4 with the wavelength of the electromagnetic wave being λ, that is, about 30 mm if the frequency is 2.45 GHz.
By doing so, the impedance in the small hole 36 becomes infinite, and the electromagnetic wave shielding effect is greatest.

In FIG. 10, reference numeral 37 denotes a pyroelectric infrared detecting element, which is the amount of infrared light entering, that is, the heating chamber 1 serving as a visual field.
The output is correlated with the temperature at the inner position.
The infrared detection element 37 is fixed inside the fixing member 38, and the field of view is narrowed through a lens 39 attached to the fixing member 38 to detect the temperature in a narrow range. The lens 39 is a Fresnel lens and is made of a material that transmits infrared rays. Reference numeral 40 denotes a stepping motor, which rotates the pinion 42 and the chopper 43 with 41 as the first rotation shaft.

The chopper 43 forms a slit and rotates while opening and closing the optical path leading to the infrared detecting element 37.
The small gear 42 is in contact with the large gear 44, and a second rotating shaft 45 is attached to the large gear 44, and the second rotating shaft 45 is rotatably attached by a receiving portion 46. In addition, the second rotary shaft 4
5, a printed circuit board 47 is attached,
In addition to the infrared detection element 37, an electronic circuit (not shown) such as an amplifier circuit is attached to the. These are housed in a metal case 49 having a small hole 48 at a position that serves as an infrared light path, covered with a metal lid 50, and fixed to the choke structure 35b with a metal lid 50.

With this configuration, the stepping motor 40 swings the infrared detecting element 37 from the front to the back in FIG. 10, and at the same time, the chopper 43 both opens and closes the optical path.
The swing cycle of the infrared detection element 37 is set to an integral fraction of the rotation cycle of the motor 40, that is, the rotation cycle of the motor 40 is set to an integral multiple of the rotation cycle of the infrared detection element 37, and each rotation of the motor 40 The temperature of the same position can be detected.

FIG. 11 shows the detection position of the infrared detecting element 37. The detection field of view of the infrared detection element 37 is shown by a small circle, and the locus of the detection center is shown by a broken line. In this example, the infrared detection element 37 swings one way to change five temperature detection positions. By the combination of this swing and the rotation of the motor 40, the detection position covers the entire plate 15 and the temperature distribution can be detected two-dimensionally. Further, since the motor 40 rotates at a cycle that is an integral multiple of the swing of the infrared detection element 37, it is possible to detect the temperature difference from the temperature of the turntable one round before and the temperature change from the initial stage at each detection position. is there.

Next, the control operation of the control means 6 will be described with reference to FIG.
This will be described below. The control means 6 controls the electromagnetic wave emission means 4 according to the temperature distribution detected by the temperature distribution detection means 21 (see FIG. 4).
Then, control the radiation antenna 9 with the stepping motor 10)
However, the object-to-be-extracted means 51 first distinguishes whether the detected temperature is the temperature of the food 2 or the temperature of the plate 15 or the wall surface of the heating chamber 1 for each detection position. At the initial stage of heating, it is not known what size the food 2 is, at what position it is placed, etc. Therefore, the uniform heating control means 52 first controls the electromagnetic wave emission means 4. The uniform heating control means 52 continuously controls the radiation antenna 9 to reciprocate by the stepping motor 10 at a cycle sufficiently faster than the rotation cycle of the motor 40, or drives the radiation antenna 9 at random to continuously control the heating antenna 1 from below. Stir the electromagnetic waves and distribute them approximately evenly. Further, while controlling the radiation antenna 9 by the stepping motor 10 by the uniform heating control means 52, whether the food 2 is or not is distinguished by the temperature rise at each detection position.

FIG. 13 shows the surface temperature change of the food 2 and the temperature change of the portion other than the food 2 such as the plate 15 when the uniform heating control means 52 controls the radiation antenna 9 by the stepping motor 10. The horizontal axis represents the elapsed time from the start of heating, and the vertical axis represents the temperature change from the start of heating. The shaded area D indicates the temperature change of the non-food 2 portion such as the plate 15, and the area E indicates the food 2 temperature. It shows the temperature change. As described above, since the plate 15 has a smaller dielectric loss than the food 5, electromagnetic waves are hardly absorbed and the temperature hardly rises, so that the plates 15 can be clearly distinguished. The temperature change calculation means 53 stores, for example, the temperatures corresponding to the respective detection positions on the first turn from the start of heating of the motor 40, and the temperatures corresponding to the respective detection positions after the lapse of t1 time from the temperatures on the first turn are stored. The temperature difference ΔT is calculated. The temperature change comparing means 54 distinguishes between the food 2 and the dish 15 if the temperature difference ΔT, which is the calculation result of the temperature change calculating means 53, is larger than the predetermined value ΔT1 of the predetermined determination curve F.

If it is possible to distinguish whether each detection position is the food 2 or the dish 15 by the object to be heated extraction means 51, the heating mode switching means 55 controls the radiation antenna 9 from the uniform heating control means 52 to the local heating control. Switch to means 56.
The local heating control means 56 controls the location where electromagnetic waves concentrate while stopping the radiation antenna 9 at an appropriate position. Reference numeral 57 denotes a low-temperature partial extraction means, which extracts low-temperature portions from the detection positions determined by the heated object extraction means 51 as food 2. The local heating control means 56 controls the position of the radiating antenna 9 so that the electromagnetic waves are radiated to the low temperature portion extracted by the low temperature portion extraction means 57. Further, if the local heating control means 56 radiates an electromagnetic wave to the low temperature portion of the food 2 so that the food 2 has no low temperature portion and the whole becomes a uniform temperature, the uniform heating control means 52 may control the radiation antenna 9 again. .

The low temperature part extracting means 57 is the infrared detecting element 3
7, the object-to-be-extracted 51 extracts the food 2
The detection position having the lowest detection temperature among the detection positions determined to be is stored as the heating position. Although the reciprocating swing of the infrared detecting element 37 is repeated during one revolution of the motor 40, the heating position in each one reciprocating swing is stored. Rotation of the motor 40 causes the local heating control means 56 to adjust the angle of the radiating antenna 9 toward a memorized heating position in the radial direction above the radiating antenna 9,
That is, the low temperature part of the food 2 is heated. By repeating this control, the food 2 does not have a low-temperature portion, and the whole food is heated uniformly.

As a simple method of reducing the number of times of driving the stepping motor 10 for driving the radiation antenna 9, the detection positions of the infrared detecting elements 37 are arranged on concentric circles, and the food is taken in units of the circumference of each concentric circle. For the circumference that can be determined as food by distinguishing between the two and the plate 15, the maximum temperature in the circumference is extracted, and the circumference having the lowest maximum temperature is extracted by the low temperature partial extraction means 57, The angle of the radiation antenna 9 may be adjusted so that the electromagnetic waves are concentrated on the circumference.
In this case, there is an effect of improving the durability performance of the radiation antenna 9.

The uniformity of the uniform heating control means 52 means that wide range heating is performed with respect to local heating, and it is not a condition that heating is performed evenly and uniformly.

Although the temperature distribution detecting means 21 is used as the physical quantity detecting means in the above description of the embodiment, the present invention is not limited to this. For example, a solid-state image sensor called a CCD image sensor that can recognize the shape and color of food can be used. In this case, the control means may control the electromagnetic wave radiating means based on the color changing with the progress of heating and its distribution.For example, in the case of meat, the whole color is light brown to match the color changing from red to light brown to whitish. The electromagnetic wave emission means is controlled so as to be finished. Further, the control means may control the electromagnetic wave radiation heating means based on the change of the shape. For example, since the rice cake becomes soft and swells, the electromagnetic wave radiating means is controlled so that the whole bulges in the same manner. The same effect can be obtained by recognizing the shape from the light path interruption pattern using a plurality of light emitting elements and light receiving elements. Further, if the optimum control pattern of the electromagnetic wave emitting means is stored in advance according to the shape, the control means can control the electromagnetic wave emitting means by the initial shape recognition that can be recognized by the solid-state imaging device or a plurality of light emitting elements and light receiving elements. Is also possible. Further, if the optimum control pattern of the electromagnetic wave radiating means according to the menu and the weight is stored in advance, it is possible to control by the weight detecting means.

(Embodiment 6) In the present embodiment, the setting means 22
A configuration in which the control unit 6 controls the position of the electromagnetic wave emission unit 4 will be described.

Referring to FIG. 4, in the control means 6, the antenna control means 24 drives the stepping motor 10 according to the input of the setting means 22 to control the radiation antenna 9 to an appropriate position. Further, the output control means 23 controls the magnetron 7 to start emission of electromagnetic waves. After that, when heating progresses,
Based on the input contents of the setting means 22, if necessary, the stepping motor 10 is driven several times to eliminate uneven heating, or the output of the magnetron 7 is changed so that the heating is completed. .

For example, it is assumed that the setting means 22 has a key "milk" as a typical means for inputting information about the name of the food 2. Liquids such as milk tend to cause convection due to heating and uneven heating in the vertical direction (the upper part tends to be hot and the lower part tends to be cold), so it is better to heat the bottom intensively to eliminate uneven heating. . Therefore, when "milk" is selected by the setting means 22, the antenna control means 24 drives the stepping motor 10 and the radiation antenna 9 is located at a position suitable for centralized bottom heating from the start to the end of heating (for example, the position shown in FIG. 6). Fixed to.

It is also assumed that the setting means 22 has a key "defrost" as a typical means for inputting the heating finish state. Frozen foods are solids that do not generate convection, and each part must be heated uniformly to eliminate uneven heating. Therefore, when "decompression" is selected by the setting means 22, the antenna control means 24 causes the stepping motor 1 to operate.
0 is driven to change the position of the radiation antenna 9 according to the physical quantity of the food 2 detected by the physical quantity detecting means (for example, the temperature distribution detecting means, the weight detecting means described in the fifth embodiment, or other detecting means).

(Seventh Embodiment) FIG. 14 shows a seventh embodiment of the present invention.
FIG. 6 is a characteristic diagram showing a control operation of the high-frequency heating device of FIG.

FIG. 14A shows time on the horizontal axis and ON / OFF operation of the power source on the vertical axis, and FIG. 14B shows time on the horizontal axis and the position of the electromagnetic wave emitting means by the position confirmation means on the vertical axis. The operation of confirmation ON / OFF is shown. In this embodiment,
When the power of the high-frequency heating device is switched from OFF to ON (when the power is turned on), the position confirmation is immediately switched from OFF to ON (the position confirmation unit confirms the position of the electromagnetic wave emission unit). This is because the position of the electromagnetic wave emitting means becomes uncontrollable when the power is turned off during heating due to a power failure, or the position of the electromagnetic wave emitting means changes when the power is off (for example, when carrying a high frequency heating device). However, if the power supply is turned on after that, the position confirmation means can promptly confirm the position of the electromagnetic wave emission means and accurately control the position.

(Embodiment 8) FIG. 15 shows an embodiment 8 of the present invention.
FIG. 6 is a characteristic diagram showing a control operation of the high-frequency heating device of FIG.

FIG. 15A shows time on the horizontal axis, ON / OFF operation of cooking on the vertical axis, and FIG. 15B shows time on the horizontal axis and electromagnetic wave emission means by the position confirmation means on the vertical axis. The operation of ON / OFF for position confirmation is shown. In this embodiment, when the cooking is turned from ON to OFF (at the end of cooking), the position confirmation is immediately turned from ON to ON (the position confirmation means confirms the position of the electromagnetic wave emission means). This is because it is possible that when repeatedly cooking, the electromagnetic wave emitting means is moved many times to gradually deviate from the target position. There is an effect that the position of can be confirmed promptly and the position can be accurately controlled.

Example 9 FIG. 16 shows Example 9 of the present invention.
FIG. 6 is a characteristic diagram showing a control operation of the high-frequency heating device of FIG.

Although not shown, this embodiment has a door, which is a typical opening / closing means for opening / closing the heating chamber, and a door latch switch, which is an opening / closing detecting means for detecting the opening / closing of the door. FIG. 16A shows time on the horizontal axis, door opening / closing operation on the vertical axis, and FIG. 16B shows time on the horizontal axis and ON for confirming the position of the electromagnetic wave emitting means by the position confirming means on the vertical axis. / OFF
The operation of FIG. In this embodiment, when the door is closed to open (when the door is opened), the position confirmation is immediately performed.
It is turned on from FF (the position confirmation means confirms the position of the electromagnetic wave emission means). This is because when the user opens the door during heating, the electromagnetic wave emission means may stop at a halfway position and control may not be possible, but the position confirmation means emits electromagnetic wave every time the door is opened. This has the effect of promptly confirming the position of the means and enabling accurate position control.

(Embodiment 10) FIG. 17 is a characteristic diagram showing the control operation of the high-frequency heating apparatus according to Embodiment 10 of the present invention.

FIG. 17 (a) shows the time on the horizontal axis, the opening / closing operation of the door on the vertical axis, and FIG. 17 (b) shows the time on the horizontal axis, and the position of the electromagnetic wave emission means by the position confirmation means on the vertical axis. Confirmation ON
/ OFF operation is shown. In this embodiment, when the door is opened to closed (when the door is closed), the position confirmation is immediately turned from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave emission means). This is because the user may touch the electromagnetic wave radiation means and change the position when the door is open, which makes it impossible to control, but the position confirmation means quickly moves the electromagnetic wave radiation means every time the door is closed. It has the effect of confirming that the position can be controlled accurately.

(Embodiment 11) FIGS. 18 to 26 are a structural view and a characteristic view of a high frequency heating apparatus of an embodiment 11 of the present invention.

FIG. 18 is a cross-sectional view of the inside of the heating chamber 1 as seen from above, in which electromagnetic waves are transmitted from the waveguide 12 (area within the wavy line) below the bottom of the heating chamber 1 to the radiation antenna 9. The position of the radiation antenna 9 is such that the radiation antenna 9 is a stopper 30.
An angle θ (real arrow line) is used as the position at which the vehicle stops at 0 °. FIG. 18 shows two states of the case where the angle is 0 degree and the case where the angle is 90 degrees. In this embodiment, a drive signal equal to or larger than the drive range is applied to rotationally drive the radiation antenna 9 counterclockwise, and the radiation antenna 9 is abutted against the stopper 30 to be stopped, and this is confirmed as a 0 ° position. Then, the position of the radiating antenna 9 is controlled by applying a drive signal corresponding to the target angle with respect to the position and driving the rotation clockwise.

FIG. 19 is a configuration diagram of the radiation antenna 9 viewed from the front. The spacer 58, which holds the radiation antenna 9 at a constant height on the bottom of the heating chamber, is made of a material such as Teflon that has a small high frequency loss, and is connected to the radiation antenna 9 and driven together. The position in the height direction is regulated by sliding while touching. The spacer 58 has a downwardly convex curved portion 59 for suppressing friction.

FIG. 20 is a configuration diagram of the turntable 16 as seen from below. The turntable 16 has a rotating shaft 29.
And a holding unit 60 for holding food through a plate. The holding unit 60 is located above the radiation antenna 9 as in FIG. The holding portion 60 includes a linear conductor 61 and two linear conductors 61 extending from the rotary shaft 29 in two opposite directions.
An annular conductor 62 connecting the linear conductors 63, a linear conductor 63 extending from the annular conductor 62 in three directions, and an annular conductor 64 connecting the three linear conductors 63. On both sides of the linear conductor 61, two transparent portions 65 capable of transmitting electromagnetic waves are formed by the linear conductor 61 and the annular conductor 62. Similarly, the annular conductor 62, the linear conductor 63, and the annular conductor 64 form three transparent portions 65. The transparent portion 66 is formed. Here, the larger the area of the transmission part is, the easier the electromagnetic waves are transmitted, but the smaller the width of the conductor is, the weaker the strength of the entire holding part 60 is. Therefore, an appropriate size is selected. In particular, the transmission part 65 is indispensable for intensively heating the bottom surface of food, and assuming that the wavelength of the electromagnetic wave is λ, the width H of the linear conductor 61 is λ / 4 or less and the length I is λ / 4 or more. Should be selected in. By the way, the wavelength λ of the electromagnetic wave often used in the microwave oven is 122 mm, and at this time, λ / 4 is 30.
5 mm. In the case of this embodiment, H = 15 mm and I = 50 m so that the bottom surface of the food can be heated more intensively.
m.

FIGS. 21 to 24 are characteristic diagrams of this embodiment. In the configuration of FIGS. 18 to 20, the angle θ of the radiation antenna 9 is changed and the temperature rise when water in the same container as in FIG. 43 is heated. It is shown.

FIG. 21 shows the case where the angle θ is 30 degrees.
(A) is the measured data, and the temperature rise at the rear right is large. Further, FIG. 21 (b) is obtained by processing the data of FIG. 21 (a) and assumes rotation of the turntable. From this result, it can be seen that the heating distribution is almost the same as that of the conventional microwave oven shown in FIG. 44, and heating progresses from the edge and the center becomes cold.

FIG. 22 shows the case where the angle θ is 60 degrees.
(A) is the actual measurement data, and the peak at the rear right is lowered.
Further, FIG. 22 (b) is obtained by processing the data of FIG. 22 (a), and assumes rotation of the turntable.
From this result, it can be seen that the temperature rises considerably in the center as compared with FIG.

FIG. 23 shows the case where the angle θ is 90 degrees.
(A) is actually measured data, and the temperature rises toward the center. Further, FIG. 23 (b) is obtained by processing the data of FIG. 23 (a) and assumes rotation of the turntable. From this result, it can be seen that the temperature rises intensively in the center.

FIG. 24 shows, from the results of FIGS. 21 to 23, the angle θ of the radiating antenna 9 as the horizontal axis and the ratio of the temperature rise of each masu to the total temperature rise as the vertical axis. It is a thing. J is the characteristic of the central masu, and K is the characteristic of the average value of the four corners. As the angle θ increases, J increases and K decreases. That is, 0
It can be seen that in the range of ≦ θ ≦ 90, the ratio of electromagnetic waves to be concentrated in the center increases as the angle θ increases. Also the angle θ
As the heating distribution changes significantly, the stopper 30
By controlling while confirming the position of the electromagnetic wave emission means, it is possible to accurately create an arbitrary heating distribution.

For example, 300 g in the microwave oven of this embodiment.
When thawing the beef sliced meat, when the heating distribution is evaluated with the angle θ of the radiation antenna 9 being stopped at one place, the angle θ of the radiation antenna 9 is 8 as shown in FIG.
At 6.25 degrees, the result was the best (state with little temperature unevenness).

FIG. 26 is a characteristic diagram showing temperature unevenness at the end of thawing and heating of 300 g of beef sliced meat. The actual temperature is plotted on the vertical axis, and the maximum and minimum temperatures are connected by a solid line. The characteristics of the current microwave oven are L (maximum temperature 50.2
C, minimum temperature −1.3 ° C., temperature difference 51.5), and the characteristic when the angle θ of the radiating antenna 9 of this embodiment is 86.25 degrees is M.
(Maximum temperature 36.1 ° C, minimum temperature -1.1 ° C, temperature difference 3
7.2), and the temperature unevenness is reduced in this example. However, in both cases, the heating condition is to turn on / off the high frequency output of about 300w from the magnetron by the output control means.
It was turned off and heated at an apparent output of 170 w for 8 minutes.

In the case of the present invention, if the angle θ is changed on the way so that the slow heating portion can be intensively heated while observing the progress of heating, the quality of the image becomes better.

(Embodiment 12) FIG. 27 is a block diagram of a high frequency heating apparatus according to Embodiment 12 of the present invention.

In FIG. 27, the object to be heated 2 in the heating chamber 1
In order to heat the sheet to a desired finished state, an electromagnetic wave emitting means 4 for emitting an electromagnetic wave 3 into the heating chamber 1, a position confirming means 5 outside the heating chamber for confirming whether the position of the electromagnetic wave emitting means 4 is correct, and an electromagnetic wave. It has a control means 6 for controlling the position of the radiating means 4 to a position suitable for the desired heating distribution. Since the position confirmation means 5 is located outside the heating chamber, it is not exposed to electromagnetic waves, so there are few restrictions in terms of constituent materials.

(Embodiment 13) FIG. 28 is a block diagram of a high frequency heating apparatus according to Embodiment 13 of the present invention.

In FIG. 28, the electromagnetic wave radiating means 4 includes an electromagnetic wave generating means 7 for generating an electromagnetic wave 3a, a wave guiding means 8 for receiving the electromagnetic wave 3a from the electromagnetic wave generating means 7 and guiding the electromagnetic wave 3a into the heating chamber 1, and a wave guiding means. Radiating means 9 for receiving the electromagnetic wave 3b guided into the heating chamber 1 by 8 and actually radiating it as the electromagnetic wave 3c, and driving means for driving the radiating means 9 by the control means 6 to change the heating distribution of the object 2 to be heated. Have ten.
The position confirming means 5 confirms the position of the radiating means 9 outside the heating chamber 1 via the driving means 10.

(Embodiment 14) FIG. 29 is a block diagram of essential parts of a high-frequency heating apparatus according to Embodiment 14 of the present invention.

In FIG. 29, the position confirming means 5 has a reference position detecting means 67 for detecting that the electromagnetic wave emitting means 4 has reached a reference position, and the position of the electromagnetic wave emitting means 4 is at the reference position. Is being detected. The control means 6 controls the position of the electromagnetic wave emission means 4 based on the signal from the reference position detection means 67. Therefore, it can be said that the position confirmation means 5 passively confirms the position of the electromagnetic wave emission means 4 by the reference position detection means 67.

(Embodiment 15) FIG. 30 is a sectional view showing the structure of a main part of a microwave oven which is a typical high-frequency heating apparatus according to Embodiment 15 of the present invention.

In FIG. 30, as electromagnetic wave emitting means,
The electromagnetic wave in the waveguide 12 is radiated into the heating chamber 1 by the coupling portion 13 and the radiation antenna 9, and the control means 6 controls the angle of the radiation antenna 9 by rotating the coupling portion 13 by the stepping motor 10. ing. Here, the rotation shaft 68 of the stepping motor 10 is connected to the cam 69 outside the heating chamber 1 below the waveguide 12, and the switch 70 is pushed when the radiation antenna 9 reaches the reference position. The control unit 6 uses a cam 69, which is a typical reference position detecting unit.
The switch 70 confirms that the radiation antenna 9 is in the reference position, and then controls the radiation antenna 9 to a desired position. Switch 7 when using a stepping motor
Positioning control can be performed accurately by the number of drive pulses after pressing 0.

Here, in this embodiment, the reference position is set at a position of 90 degrees (see FIG. 18), heating is always started at the reference position, and the position of the radiating antenna 9 is changed during the heating so that it occurs until then. It is configured to compensate for the uneven heating.

Therefore, since the position where the heating is started is the reference position for checking the position of the electromagnetic wave radiating means, there is an effect that the heating can be started immediately after checking the position.

Further, since the position of the radiation antenna 9 at the start of heating is always constant, the heating distribution generated at the beginning of heating is almost constant for the same food. Therefore, the position of the radiation antenna 9 to be changed in the middle of heating in order to compensate for the uneven heating is roughly determined, and can be patterned for each food. Therefore, the control sequence can be simplified and the number of parts constituting the control means 6 can be reduced.

Further, since the position of the radiation antenna 9 at the start of heating is at the angle of 90 degrees, food can be centrally heated from the center of the bottom surface. Therefore, since the electromagnetic waves are likely to enter the food before being diffused into the heating chamber 1, heating can be most efficiently started. In particular, when heating a liquid such as milk, concentrated heating from the center of the bottom surface from the beginning to the end has a better heating distribution, and the position of the radiation antenna 9 does not need to be moved even once, which is more efficient.

The cam 69 is used as the reference position detecting means.
Besides the combination of the switch 70 and the switch 70, it is possible to confirm the reference position by detecting various physical quantities.

(Embodiment 16) FIG. 31 is a characteristic diagram showing the control operation of the high-frequency heating apparatus of embodiment 16 of the present invention.

In FIG. 31 (a), the horizontal axis represents time, and the vertical axis represents ON / OFF of the position confirmation of the electromagnetic wave emission means by the position confirmation means.
31B, the horizontal axis represents time, and the vertical axis represents ON of the high frequency output from the electromagnetic wave emission means by the output control means.
/ OFF operation is shown. In this embodiment, when the position confirmation is turned from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave emission means), the high frequency output is set to 0 in advance.
Turn off from N (stop heating). Further, after turning the position confirmation from ON to OFF (the position confirming means has finished confirming the position of the electromagnetic wave emitting means), the high frequency output is turned from OFF to ON (heating is restarted). This is because the position of the electromagnetic wave emission means when confirming the position is not necessarily a position suitable for heating, and it is intended to prevent heating of an undesired portion by emitting electromagnetic waves during position confirmation. Therefore, there is an effect that unnecessary heating unevenness is not generated.

As another method, even if the high frequency output is not reduced to 0 during the position confirmation, it is effective only to reduce the high frequency output. In this case, since heating proceeds even during the position confirmation, there is an effect that the heating time can be shortened compared to when the high frequency output is set to zero.

(Embodiment 17) FIG. 32 is a block diagram of a high frequency heating apparatus according to Embodiment 17 of the present invention.

In FIG. 32, the object to be heated 2 in the heating chamber 1
In order to heat the sheet to a desired finished state, the electromagnetic wave radiating means 4 for radiating the electromagnetic wave 3 in the heating chamber 1, the position confirming means 5 for confirming whether or not the position of the electromagnetic wave radiating means 4 is correct, and the electromagnetic wave. It has a control means 6 for controlling the position of the radiating means 4 to a position suitable for the desired heating distribution. In this embodiment, since the electromagnetic wave emitting means 4 is provided in the heating chamber 1, there is an effect of suppressing the loss when the electromagnetic wave is transmitted from the electromagnetic wave emitting means 4 into the heating chamber 1.

(Embodiment 18) FIG. 33 is a block diagram of a high frequency heating apparatus according to Embodiment 18 of the present invention.

In FIG. 33, the object to be heated 2 in the heating chamber 1
In order to heat the sheet to a desired finished state, the electromagnetic wave radiating means 4 for radiating the electromagnetic wave 3 in the heating chamber 1, the position confirming means 5 for confirming whether or not the position of the electromagnetic wave radiating means 4 is correct, and the electromagnetic wave. It has a control means 6 for controlling the position of the radiating means 4 to a position suitable for the desired heating distribution. In this embodiment, since the electromagnetic wave emitting means 4 is provided in the heating chamber 1, there is an effect of suppressing the loss when the electromagnetic wave is transmitted from the electromagnetic wave emitting means 4 into the heating chamber 1. Further, since the position confirmation means 5 is located outside the heating chamber, it is not exposed to electromagnetic waves, so there are few restrictions in terms of constituent materials.

Although the specific structure described above is mainly a structure having a turntable, the present invention is not limited to this. For example, instead of not having a turntable, the electromagnetic wave radiation means can be used not only for one-axis rotation but also for two rotations.
A method of driving dimensionally is also conceivable. In this case, since the food is not moved, it is possible to heat the heavy food. Also, unlike the configuration in which food can be placed only on a round turntable, there is an effect that the space in the heating chamber can be effectively utilized.

Even if a turntable is provided, it is not limited to rotating food on a plane. Various methods are conceivable, such as moving the food up and down, or combining the vertical movement and the movement on a plane, and controlling the food in association with the position of the electromagnetic wave emitting means. In this case, there is an effect that the heating distribution can be controlled more finely.

[0128]

As described above, the high-frequency heating apparatus of the present invention has the following effects.

Since the position of the movable electromagnetic wave emitting means is confirmed and the position of the electromagnetic wave emitting means is controlled by the control means,
Since the electromagnetic wave emission means can be accurately controlled at the desired position,
The object to be heated can be in a desired finished state.

Further, since the position of the electromagnetic wave radiating means is confirmed when the power is turned on, even when the electromagnetic wave radiating means is used after the power source is removed and inserted, the electromagnetic wave radiating means can be accurately controlled to a desired position without becoming an indefinite position.

Further, since the position of the electromagnetic wave radiating means is confirmed after the completion of cooking, even when another cooking is performed after the completion of cooking,
The electromagnetic wave radiating means can be accurately controlled to a desired position without being placed in an indefinite position.

Further, since the position of the electromagnetic wave radiating means is confirmed after the opening / closing of the heating chamber is detected, even if the user opens / closes during cooking, the electromagnetic wave radiating means does not become an indefinite position but a desired position. Can be controlled accurately.

Further, the position is confirmed by detecting that the electromagnetic wave radiating means has reached the reference position, or the electromagnetic wave radiating means is stopped at the reference position to control the desired position. Positional deviation can be corrected.

Further, since the position of the electromagnetic wave emitting means is confirmed at the position where the heating is started, the heating can be started immediately after the position is confirmed.

Further, since the position of the electromagnetic wave radiating means at the start of heating is always constant and the position of the electromagnetic wave radiating means is controlled to change from the middle, if the same object to be heated, the heating distribution from the start to the middle of the heating. Can be constant.

Further, at the start of heating, the position of the electromagnetic wave radiating means is controlled so that the center of the bottom surface of the object to be heated is heated so that the center of the bottom surface of the object to be heated is prevented from being insufficiently heated. be able to.

Further, when confirming the position of the electromagnetic wave radiating means, the electromagnetic wave output is controlled so as to be 0 or lowered, so that in order to suppress the generation of the electromagnetic wave when confirming the position, heating unevenness during the position confirmation is suppressed. It is possible to prevent the occurrence of power consumption and unnecessary power consumption.

Further, since the driving means can accurately control the radiating means to a desired position, the object to be heated can be brought into a desired finished state.

Further, since the position of the electromagnetic wave emitting means is controlled by the physical quantity detecting means, it is possible to
Since the electromagnetic wave emission means can be accurately controlled at the desired position,
The object to be heated can be appropriately finished.

Further, since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the temperature distribution of the object to be heated, the object to be heated can be brought into an appropriate finished state.

Further, since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the weight of the object to be heated, the object to be heated can be brought into an appropriate finished state.

Further, since the electromagnetic wave radiating means can be accurately controlled to a desired position according to the user's setting, the object to be heated can be brought into a desired finished state.

[Brief description of drawings]

FIG. 1 is a block diagram of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a high frequency heating apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a high frequency heating apparatus according to a third embodiment of the present invention.

FIG. 4 is a sectional configuration diagram of a high-frequency heating device according to a fourth embodiment of the present invention.

FIG. 5 is a sectional configuration diagram of the high-frequency heating device.

FIG. 6 is a sectional configuration diagram of the high-frequency heating device.

FIG. 7 is a sectional configuration diagram of the high-frequency heating device.

FIG. 8 is a sectional configuration diagram of the high-frequency heating device.

FIG. 9 is a sectional configuration diagram of the high-frequency heating device.

FIG. 10 is a sectional configuration diagram of a temperature distribution detecting means of a high frequency heating apparatus according to a fifth embodiment of the present invention.

FIG. 11 is a characteristic diagram of the high frequency heating device.

FIG. 12 is a block diagram of control means of the high-frequency heating device.

FIG. 13 is a characteristic diagram of the high-frequency heating device.

FIG. 14 (a) is a characteristic diagram of a high frequency heating apparatus according to a seventh embodiment of the present invention.

FIG. 15 (a) is a characteristic diagram of the high-frequency heating apparatus according to the eighth embodiment of the present invention.

FIG. 16 (a) is a characteristic diagram of a high frequency heating apparatus according to a ninth embodiment of the present invention.

FIG. 17 (a) is a characteristic diagram of the high-frequency heating apparatus according to the tenth embodiment of the present invention.

FIG. 18 is a sectional configuration diagram of a high-frequency heating device according to Example 11 of the present invention.

FIG. 19 is a configuration diagram of a radiation antenna of the high-frequency heating device.

FIG. 20 is a configuration diagram of a turntable of the high frequency heating device.

FIG. 21 (a) is a characteristic diagram of the high-frequency heating device. (B) is a characteristic diagram of the same.

FIG. 22 (a) is a characteristic diagram of the high-frequency heating device, and (b) is a characteristic diagram of the same.

FIG. 23 (a) Characteristic diagram of the same high-frequency heating device (b) Same characteristic diagram

FIG. 24 is a characteristic diagram of the high-frequency heating device.

FIG. 25 is a configuration diagram of main parts of the same high-frequency heating device.

FIG. 26 is a characteristic diagram of the same high-frequency heating device and a conventional high-frequency heating device.

FIG. 27 is a block diagram of a high-frequency heating device according to a twelfth embodiment of the present invention.

FIG. 28 is a block diagram of a high frequency heating apparatus according to a thirteenth embodiment of the present invention.

FIG. 29 is a block diagram of a high-frequency heating device according to a fourteenth embodiment of the present invention.

FIG. 30 is a cross-sectional configuration diagram of essential parts of a high-frequency heating device according to a fifteenth embodiment of the present invention.

FIG. 31 (a) is a characteristic diagram of the high-frequency heating device according to the sixteenth embodiment of the present invention (b) is a characteristic diagram thereof

FIG. 32 is a block diagram of a high frequency heating apparatus according to a seventeenth embodiment of the present invention.

FIG. 33 is a block diagram of a high-frequency heating device according to Example 18 of the present invention.

FIG. 34 is a sectional configuration diagram of a conventional high-frequency heating device.

FIG. 35 is a block diagram of another conventional high-frequency heating device.

FIG. 36 is a sectional configuration diagram of the high-frequency heating device.

FIG. 37 is a configuration diagram of the main parts of another conventional high-frequency heating device.

FIG. 38 is a configuration diagram of main parts of the high-frequency heating device.

FIG. 39 is a sectional configuration diagram of another conventional high-frequency heating device.

FIG. 40 is a cross-sectional configuration diagram of another conventional high-frequency heating device.

FIG. 41 is a configuration diagram of main parts of the high-frequency heating device.

FIG. 42 is a cross-sectional configuration diagram of main parts of the high-frequency heating device.

FIG. 43 is a configuration diagram of a container

FIG. 44 (a) Characteristic diagram of another conventional high-frequency heating device (b) Same characteristic diagram

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Food (object to be heated) 3, 3a, 3b, 3c Electromagnetic wave 4 Electromagnetic wave emitting means 5 Position confirming means 6 Control means 7 Magnetron (electromagnetic wave generating means) 8 Waveguide means 9 Radiating antenna (radiating means) 10 Stepping motor (Drive Means) 11 Stopping Means 12 Waveguide (Waveguide Means) 13 Coupling Section (Waveguide Means) 19 Weight Detecting Means (Physical Quantity Detecting Means) 21 Temperature Distribution Detecting Means (Physical Quantity Detecting Means) 22 Setting Means 23 Output Control Means 30 stopper (stopping means) (position confirmation means) 67 reference position detection means 69 cam (reference position detection means) (position confirmation means) 70 switch (reference position detection means) (position confirmation means)

Claims (16)

[Claims] 1. In order to obtain a desired finished state of an object to be heated, the position of a movable electromagnetic wave emitting means for emitting an electromagnetic wave is confirmed in the heating chamber so that the desired finished state can be obtained. A high-frequency heating device characterized by being controlled to. 2. An electromagnetic wave emitting means for emitting an electromagnetic wave into a heating chamber to heat an object to be heated, a position confirming means for confirming the position of the electromagnetic wave emitting means, and a control means for controlling the position of the electromagnetic wave emitting means. High frequency heating device. 3. The high frequency heating apparatus according to claim 2, wherein the position confirmation means is configured to confirm the position of the electromagnetic wave emission means when the power is turned on. 4. The high frequency heating apparatus according to claim 2, wherein the position confirming means is configured to confirm the position of the electromagnetic wave emitting means after the completion of cooking. 5. An opening / closing means for opening / closing the heating chamber, and an opening / closing detecting means for detecting a change of the opening / closing means from open to closed or from closed to open, and the position confirming means is opened or closed by the open / close detecting means. The high frequency heating device according to claim 2, wherein the position of the electromagnetic wave emitting means is confirmed after the closing is detected. 6. The position confirmation means has a reference position detection means for detecting that the electromagnetic wave emission means has reached a reference position, and the control means has the electromagnetic wave based on a signal from the reference position detection means. The high frequency heating device according to claim 2, wherein the position of the radiating means is controlled. 7. The high-frequency heating device according to claim 2, wherein the position confirmation means has a stop means for stopping the electromagnetic wave emission means at a reference position. 8. The high-frequency heating device according to claim 2, wherein the position confirmation means confirms the position of the electromagnetic wave emission means at a position where heating is started. 9. The high-frequency heating apparatus according to claim 8, wherein the control means is configured so that the position of the electromagnetic wave emitting means at the start of heating is always constant and the position of the electromagnetic wave emitting means is changed midway. 10. The high frequency heating apparatus according to claim 8, wherein the control means controls the position of the electromagnetic wave radiating means so that the heating distribution is such that the center of the bottom surface of the object to be heated is heated when heating is started. 11. An output control means for controlling an electromagnetic wave output from the electromagnetic wave emission means, wherein the output control means, when the position confirmation means confirms the position of the electromagnetic wave emission means,
The high frequency heating device according to any one of claims 2 to 10, wherein the electromagnetic wave output is controlled to be 0 or reduced. 12. The electromagnetic wave radiating means includes an electromagnetic wave generating means for generating an electromagnetic wave, a wave guiding means for guiding the electromagnetic wave from the electromagnetic wave generating means into the heating chamber, and a radiating means for radiating the electromagnetic wave guided by the wave guiding means. And driving means for driving the radiating means, the heating distribution of the object to be heated changes depending on the position of the radiating means, and the position confirming means confirms the position of the radiating means or the position of the driving means. , The control means
The high frequency heating device according to claim 2, wherein the driving means is controlled to control the position of the radiating means. 13. A physical quantity detecting means for detecting a physical quantity of an object to be heated, wherein the control means controls the position of the electromagnetic wave emitting means by the physical quantity detecting means. The high frequency heating device according to. 14. The physical quantity detecting means is constituted by temperature distribution detecting means for detecting the temperature distribution of the object to be heated.
The high-frequency heating device as described. 15. The high frequency heating apparatus according to claim 13, wherein the physical quantity detecting means is constituted by weight detecting means for detecting the weight of the object to be heated. 16. A setting means is provided which allows a user to set at least one of a name, a kind and a state before heating, a heating method or a heating finish state, and the control means uses the setting means. The high-frequency heating device according to claim 2, wherein the position of the electromagnetic wave emitting means is controlled.