JP3617181B2 - High frequency heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating apparatus provided with electromagnetic wave radiation means for changing the dielectric heating distribution of an object to be heated by electromagnetic waves.
[0002]
[Prior art]
Conventional microwave ovens, which are typical high-frequency heating devices, have a configuration as shown in FIGS.
[0003]
The microwave oven of FIG. 34 has a general configuration using the turntable 16. Here, the electromagnetic wave emitted from the magnetron 7 as the electromagnetic wave generating means is transmitted through the waveguide 12 and becomes a standing wave determined by the shape of the heating chamber 1 and the position of the opening 71 from which the electromagnetic wave is emitted. 1 is distributed. And it generates heat according to the electric field component of the electromagnetic wave given to each part of food 2 and the dielectric loss of each part. The power P [W / m3] absorbed per unit volume of the food is determined by the strength of the applied electric field E [V / m], the frequency f [Hz], and the relative permittivity εr and the dielectric loss tangent tanδ of the food 2 ( 1) It is expressed as an equation. In this conventional example, since the heating distribution of the food 2 is generally determined by the standing wave distribution of electromagnetic waves, the turntable 16 is rotationally driven to equalize the heating distribution on the concentric circles in order to suppress unevenness of the heating distribution.
[0004]
P = (5/9) εr · tan δ · f · E2 × 10 −10 [W / m 3] (1)
In addition, there is a technique that changes a heating distribution by switching a plurality of openings as disclosed in JP-A-7-1981147. 35 and 36, 20 waveguides 12 are arranged in a matrix form outside the bottom surface of the heating chamber, and power feeding to each waveguide 12 is selectively controlled. Which waveguide is fed is controlled by temperature detecting means 72 that detects the local temperature in the heating chamber 1, and has 20 mirrors 73 vertically above each opening 71. Infrared light is guided to five sets of temperature detecting means 72 via five sets of concave mirrors 74. 37 and 38 show a configuration in which the heating point is moved by rotating the opening 75 about the rotation shaft 76, and is heated locally in combination with the turntable 16. The position of the opening 75 is controlled to arbitrarily change the heating point in the radial direction of the turntable 16, and the rotation of the turntable 16 is controlled to arbitrarily change the heating point in the circumferential direction.
[0005]
Further, as disclosed in Japanese Patent Application Laid-Open No. 7-161469, there is one that rotates the opening while detecting the rotational position. In this conventional example, as shown in FIGS. 39 to 42, an annular rectangular waveguide 77, an opening 78 whose position changes due to rotation, motors 79 and 80, rotation shafts 81 and 82, and a rotation angle detector (absolute rotary Encoder) 83, and the rotation angle, that is, the rotational position of the opening 78 can be detected.
[0006]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, when an electromagnetic wave is introduced into the heating chamber by connecting the waveguide and the heating chamber, the position of the appropriate opening that makes the heating distribution uniform differs depending on the material and shape of the food, and one opening There was a problem that it was not possible to heat all foods uniformly.
[0007]
For example, it is generally known that when a flat food is heated in a conventional microwave oven, remarkable heating unevenness occurs in which the heating proceeds from the edge and the center remains cold. As an example, as shown in Fig. 43, when water is put into an acrylic container 84 that is flat and divided into 5x5 cells and heated in a conventional microwave oven (the position of the opening is at the back), each temperature rises. FIG. 44 (a) is shown. Since the shape of the container 84 was just large enough to enter the heating chamber and could not be rotated, the container was fixed and heated at a position slightly higher than the turntable. Since the position of the opening is behind, it can be seen that the temperature rise at the rear side increases. FIG. 44 (b) is a result of processing the data of FIG. 44 (a), and averages the temperature rise at the target position (equal distance from the center) centered on the center trough. It assumes averaging by rotation. From this result, as described above, it can be seen that the heating proceeds from the edge, and the heating unevenness occurs at the center.
[0008]
Also, as a feature 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 the solid state without convection The food has a problem that the temperature rises only at the bottom. If the turntable is used at this time, 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 viewed from the center of rotation are not improved.
[0009]
On the other hand, as shown in FIG. 35 and FIG. 36, those that place emphasis on radiation rather than standing waves and control the radiation position of electromagnetic waves from below that are close to food, Can be heated. However, many waveguides 12 are required, and there is a problem that a configuration for switching power feeding to each waveguide 12 becomes complicated.
[0010]
In addition, there is a problem that heating between two adjacent openings or between four openings 71 cannot be performed.
[0011]
Furthermore, as shown in FIGS. 37 to 42, when the positions of the openings 75 and 78 are changed by the annular rectangular waveguide 77 or the annular waveguide 85, the excitation positions can be changed continuously. However, there is a problem that the annular rectangular waveguide 77 and the annular waveguide 85 have a large space and the configuration is complicated. According to FIG. 38, since the ratio occupied by the turntable 16 in the heating chamber is small, there is a problem that a space for placing food is limited. Further, since the annular waveguide 85 is in the way, there is a problem that other parts such as a bottom heater cannot be configured.
[0012]
In FIGS. 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 cause concentration of the electric field. There is a problem that the drive part may be clogged and the drive may be stopped.
[0013]
40 and 42, the rotation angle detector 83 can detect the rotational position of the opening 78, and the position of the opening 78 can be controlled with high accuracy. However, since excitation is performed from the side opening 78, there is a distance until the electromagnetic wave reaches the food 2, and the electromagnetic wave is diffused. The degree of diffusion varies greatly 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 portion to be heated cannot be specified. Therefore, it is not possible to heat only the target portion. Therefore, there is a problem that even if the position of the opening 78 is accurately controlled by the rotation angle detector 83, the effect is small. In addition, when electromagnetic waves diffuse, they collide with various parts other than food (parts that should not be heated, such as the wall surface of the heating chamber) to cause loss, resulting in a problem of poor heating efficiency. In addition, when multiple different types of food are added, it is not possible to select and heat only one of them, and electromagnetic waves collide with all of them, resulting in light or low density or dielectric loss (relative dielectric constant and There is a problem that the temperature of the product having a large product of the dielectric loss tangent increases first.
[0014]
In addition, 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 wires must be increased according to the number of bits. In other words, there is a problem that the configuration related to control is complicated and the cost is high.
[0015]
[Means for Solving the Problems]
In order to solve the above problems, the present invention From magnetron Electromagnetic wave In the heating chamber Radiation that radiates and heats the object to be heated An antenna and reference position detecting means for detecting that the radiation antenna has reached a reference position; Yes Do Position confirmation means And based on a signal from the reference position detecting means radiation Antenna Position Control Control means The position confirmation means includes the radiation Antenna is standard position Make sure To do.
[0016]
According to the above invention, since the electromagnetic wave radiation means can be accurately controlled to a desired position, the object to be heated can be brought into a desired finished state.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
Example 1
1 is a block diagram of a high-frequency heating device according to a first embodiment of the present invention.
[0019]
In FIG. 1, in order to heat the article 2 to be heated in the heating chamber 1 to a desired finished state, the electromagnetic wave radiating means 4 for radiating the electromagnetic wave 3 into the heating chamber 1 and the position of the electromagnetic wave radiating means 4 are correct. And a control means 6 for controlling the position of the electromagnetic wave radiation means 4 to an appropriate position for a desired heating distribution.
[0020]
Here, the electromagnetic wave radiation means 4 of the present invention may be anything as long as the distribution of electromagnetic waves in the heating chamber changes depending on the position. For example, those that move the means to generate electromagnetic waves such as magnetron and semiconductor oscillation, those that move the radiation antenna, those that move the dielectric or metal in the heating chamber (similar to the stirrer), the waveguide itself There are those that move, those that move the dielectric or metal in the waveguide, and those that move the opening and closing (deforming) means that open and close (or deform) at least a part of the opening of the waveguide that radiates electromagnetic waves. It is not limited to only. If the distribution of electromagnetic waves in the heating chamber changes depending on the position, the heating distribution (finished state) can be changed by confirming the position and controlling it to an appropriate position.
[0021]
(Example 2)
FIG. 2 is a block diagram of the high-frequency heating device according to the second embodiment of the present invention.
[0022]
In FIG. 2, the electromagnetic wave radiation means 4 includes an electromagnetic wave generation means 7 that generates an electromagnetic wave 3 a, a waveguide means 8 that receives the electromagnetic wave 3 a from the electromagnetic wave generation means 7 and guides it into the heating chamber 1, and is heated by the waveguide means 8. A radiating means 9 that receives the electromagnetic wave 3b guided into the chamber 1 and actually radiates it as the electromagnetic wave 3c, and a driving means 10 that drives the radiating means 9 by the control means 6 to change the heating distribution of the object to be heated 2 are provided. doing. The position confirmation means 5 confirms the position of the radiation means 9 in the heating chamber 1.
[0023]
Here, the radiating means is a device that radiates an electromagnetic wave by applying an electric field to a conductor (radiating antenna), and a device that emits an electromagnetic wave confined in a closed space from an opening (or excitation port or power supply port) (waveguide). Tube)).
[0024]
(Example 3)
FIG. 3 is a main part block diagram of the high-frequency heating device according to the third embodiment of the present invention.
[0025]
In FIG. 3, the position confirmation means 5 has a stop means 11 for stopping the electromagnetic wave radiation means 4 at a reference position, and forcibly stops even if the control means 6 tries to move the electromagnetic wave radiation means 4 beyond that. Is. Therefore, it can be said that the position confirmation means 5 actively confirms the position of the electromagnetic wave radiation means 4 by the stop means 11.
[0026]
Example 4
4-9 is a cross-sectional block diagram of the microwave oven which is a typical high frequency heating apparatus of Example 4 of this invention.
[0027]
In FIG. 4, the electromagnetic wave radiating means 4 is a coupling in which an electromagnetic wave emitted from a magnetron 7 which is a representative electromagnetic wave generating means is coaxially coupled to the waveguide 12 and the waveguide 12 constituting the typical waveguide means 8. It is radiated | emitted in the heating chamber 1 by the radiation antenna 9 which is a typical radiation means through the part 13, and heats the foodstuff 2 which is a typical to-be-heated object. In addition, the holding unit 14 that holds the coupling unit 13 between the waveguide 12 and the stepping motor 10 that is a typical driving unit that engages with the coupling unit 13 and rotationally drives the coupling unit 13 and the radiation antenna 9 are configured. doing.
[0028]
The heating chamber 1 has a glass or ceramic dish 15 that is transparent to electromagnetic waves and a turntable 16 for placing the food 2 and rotating it during heating, and is stored when the radiation antenna 9 is not used. In order to do this, a projecting portion 17 configured by projecting a part of the wall surface to the outside of the heating chamber 1 is configured.
[0029]
Outside the heating chamber 1 are a turntable motor 18 that rotates the turntable 16, a weight detection means 19 for determining the weight of the food 2, a heater 20 that radiates and heats the food 2 during oven cooking and grill cooking, and food. The temperature distribution detecting means 21 for detecting the temperature distribution 2, the setting means 22 for setting and inputting by the user, and the control means 6 are configured. Here, the setting means 22 indicates that the user has information on the name of the food 2 (eg “milk”, “sake”, etc.), information on the type of food 2 (eg “root vegetables”, “leaf vegetables”, etc.), Depending on whether you enter or select information about the status of the product (eg initial temperature, storage status, etc.), heating method (eg “strong”, “weak” etc.) or finished heating status (eg “thaw”, “warm” etc.) It is to set. The control means 6 controls the output control means 23 for controlling the electromagnetic wave output from the magnetron 7, the 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 18. It has table control means 25 for controlling the rotation and stop of the turntable 16 and is controlled by weight detection means 19, temperature distribution detection means 21, setting means 22 and the like.
[0030]
FIG. 5 shows a cross section taken along line AA ′ of FIG. In FIG. 5, the electromagnetic wave radiated from the radiating portion 26 of the magnetron 7 is transmitted through the waveguide 12 at the guide wavelength λg, the electric field in the radiating portion 26 is strong, and the electric field is strong and weak every λg / 4 (abdominal node). It becomes a standing wave that repeats. Further, in order to efficiently guide the electromagnetic wave in the waveguide 12 to the projecting portion 17 by the coupling portion 13, the distance L1 from the radiation portion 26 to the coupling portion 13 is m · λg / 2 (where m is an integer of 0 or more). It is said. Further, in order to weaken the electric field at the end face 27 of the waveguide 12, the distance L2 from the coupling portion 13 to the end face 27 is set to (2n + 1) · λg / 4 (where n is an integer of 0 or more).
[0031]
6 to 8 show the BB ′ cross section of FIG.
[0032]
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 radiation antenna 9 can be changed within the range of the solid arrow lines 28a and 28b, and is driven by the stepping motor 10 for positioning. The position of the radiation antenna 9 in FIG. 6 is a position facing the rotation axis 29 of the turntable 16, and has a strong directivity in the center direction of the bottom surface of the heating chamber 1 in the driving range of the radiation antenna 9. At this time, the radiating antenna 9 is located close to the food 2 on the turntable 16, and the center of the bottom surface of the food 2 can be intensively heated.
[0033]
In FIG. 7, the position of the radiation antenna 9 is a position facing the corner of the heating chamber 1, and has a strong directivity in the peripheral direction of the heating chamber 1 in the driving range of the radiation antenna 9. At this time, the radiating antenna 9 is located away from the food 2 on the turntable 16, and can spread the electromagnetic wave and heat the food 2 from the surroundings.
[0034]
In FIG. 8, the radiating antenna 9 is driven clockwise by the stepping motor 10 as viewed from FIGS. 6 to 8 (in the direction of the solid arrow 28a in FIG. 6), but when it hits a stopper 30 which is a typical stop means. Since it cannot be driven any more, it is held at this position (reference position). At this time, the antenna control means 24 drives the radiating antenna 9 clockwise (in the direction of the solid arrow 28a in FIG. 6) as viewed from FIGS. 6 to 8 by the stepping motor 10, 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 stop means and a position confirmation means for confirming that the radiation antenna 9 is at the reference position.
[0035]
Furthermore, since the heating distribution of food greatly changes depending on the position of the radiation antenna 9, the position of the radiation antenna 9 must be accurately controlled. Therefore, in this embodiment, the radiation antenna 9 is once driven to the reference position, and then the direction is reversed (counterclockwise) to the target position and stopped.
[0036]
Further, by stopping the radiation antenna 9 at the reference position, the whole radiation antenna 9 is stored in the protruding portion 17. In this embodiment, when the radiating antenna 9 is located in the heating chamber 1, it becomes a hindrance (for example, when it is desired to heat only with the heater 20 or when the user cleans the inside of the heating chamber 1), the radiating antenna 9 is used. It is stored in the protrusion 17 so as not to get in the way.
[0037]
FIG. 9 shows a cross section taken along the line CC ′ of FIG.
[0038]
In FIG. 9, the radiating antenna 9 has a concentrating portion 31 that is bent to concentrate an electric field, and the portion from the concentrating portion 31 to the tip 32 is positioned upward by being bent. Therefore, the electric field generated from the concentrated portion 31 to the tip 32 is easily transmitted upward, and has an effect of increasing directivity. For example, when the radiating antenna 9 is located at a position as shown in FIG. 6, the vertical distance from the object to be heated is close at the portion 32 from the concentrating part 31, so that the object to be heated is more intensively heated.
[0039]
Further, since the radiation antenna 9 is long, the position of the tip 32 in the height direction is likely to fluctuate and fluctuate simply by being held by the holding portion 14. Therefore, a spacer 33 that holds the radiating antenna 9 is configured on the bottom surface of the heating chamber 1, and when the radiating antenna 9 is driven, the position in the height direction is regulated while sliding on the spacer 33 to suppress wobbling. .
[0040]
Hereinafter, the control means 6 will be described.
[0041]
In the present embodiment, the table control means 25 rotates the turntable 16 at a constant rate to make the heating distribution on the concentric circles about the rotation shaft 29 uniform. When the turntable 16 rotates constantly, the portion where the electromagnetic wave concentrates changes in the radial direction of the turntable 16 depending on the position of the radiating antenna 9, so that switching is continuously performed from the bottom concentrated heating to the ambient dispersion heating. Can do.
[0042]
Note that 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 an inner lunch box of a curtain, food that should be heated like rice and food that should be eaten at low temperatures such as raw vegetables, sashimi and pickles are contained in one container. In this case, it is desirable that the rice and raw vegetables, sashimi and pickles are not separated and placed in a heating chamber in a single container to heat only the rice. Therefore, when the portion (for example, rice) to be heated locally comes directly above the radiating antenna 9 while the turntable 16 is rotating, the turntable 16 is stopped or the rotation speed is reduced. Only the part can be heated intensively. This method has the effect that local heating and selective heating can be performed, and energy loss is prevented because unnecessary heating is not performed.
[0043]
Note that there is a method of obtaining the same effect as when the turn control 16 is shifted by the table control means 25 by the output control means 23. While the turntable 16 is rotating at a constant speed, the oscillation of the magnetron 7 may be stopped so that the electromagnetic wave is not allowed to enter the heating chamber 1 in a time zone where the portion to be locally heated is located away from the radiation antenna 9. . However, in this case, it takes a long time to complete the heating.
[0044]
Moreover, although the temperature distribution detection means 21 detects the temperature of the foodstuff 2 from the opening 34 of the wall surface of the heating chamber 1, and detects heating distribution, it adds description about the structure of temperature distribution detection means 21 itself. As a general temperature distribution detecting means 21 for detecting the temperature in a non-contact manner, there is an infrared sensor that converts an infrared ray 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, a pyroelectric type having a chopper, and the like, either of which may be adopted in the present invention.
[0045]
(Example 5)
10-13, the operation of the temperature distribution detection means 21 of the microwave oven according to the fifth embodiment of the present invention and the operation of the control means 6 by the temperature distribution detection means 21 will be described.
[0046]
FIG. 10 shows a cross-sectional configuration diagram of a main part of the microwave oven. An opening 34 is provided on the wall surface of the heating chamber 1 to form a choke structure that prevents electromagnetic waves by using two types of sheet metal 35a and 35b. 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. Reference numeral 35b denotes a box-shaped metal part having a small hole 36, which is in close contact with the wall surface. Although the infrared rays are emitted from the inside of the heating chamber 1 through the small holes 36 by the choke structures 35a and 35b, the electromagnetic waves in the heating chamber 1 are blocked and hardly leak to the outside. In FIG. 10, the dimension L is designed to be λ / 4 where the wavelength of the electromagnetic wave is λ, that is, about 30 mm if the frequency is 2.45 GHz, the impedance at the small hole 36 becomes infinite, and the electromagnetic wave blocking effect is The biggest.
[0047]
In FIG. 10, reference numeral 37 denotes a pyroelectric infrared detecting element which outputs an output having a correlation with the amount of incident infrared light, that is, the temperature at the position in the heating chamber 1 as a visual field. The infrared detecting element 37 is fixed inside the fixing member 38, and detects a narrow range of temperature by narrowing the field of view through a lens 39 attached to the fixing member 38. The lens 39 is a Fresnel lens made of a material that transmits infrared rays. Reference numeral 40 denotes a stepping motor, which rotates the small gear 42 and the chopper 43 around 41 as a first rotating shaft.
[0048]
The chopper 43 forms a slit and rotates while opening and closing the optical path reaching the infrared detection 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. A printed circuit board 47 is attached to the second rotating shaft 45, and an electronic circuit (not shown) such as an amplifier circuit is attached to the printed circuit board 47 in addition to the infrared detection element 37. These are housed in a metal case 49 having a small hole 48 at a position to be an infrared light path, covered with a metal lid 50, and fixed to the choke structure 35b with the metal lid 50.
[0049]
With this configuration, the stepping motor 40 swings the infrared detecting element 37 from the front of FIG. 10 to the back, and simultaneously performs both opening and closing of the optical path by the chopper 43. The oscillation period of the infrared detection element 37 is set to 1 / integer of the rotation period of the motor 40, that is, the rotation period of the motor 40 is set to be an integral multiple of the rotation period of the infrared detection element 37. The temperature can be detected at the same position.
[0050]
FIG. 11 shows the detection position of the infrared detection element 37. The detection visual field of the infrared detection element 37 is indicated by a small circle, and the locus of the detection center is indicated by a broken line. In this example, the temperature detection position is changed in five places on the one-way swing of the infrared detection element 37. The combination of this swing and rotation of the motor 40 allows the detection position to cover the entire plate 15 and detect the temperature distribution two-dimensionally. In addition, since the motor 40 rotates at a cycle that is an integral multiple of the swing of the infrared detection element 37, the temperature difference from the temperature one turn before the turntable and the temperature change from the initial stage can be detected at each detection position. is there.
[0051]
Next, the control operation of the control means 6 will be described with reference to FIG. The control means 6 controls the electromagnetic wave radiation means 4 based on the temperature distribution detected by the temperature distribution detection means 21 (in FIG. 4, the radiation antenna 9 is controlled by the stepping motor 10). First, the detected temperature is the temperature of the food 2 It is the heated object extraction means 51 that distinguishes whether the temperature is the temperature of the plate 15 or the wall surface of the heating chamber 1 for each detection position. Since it is not known at what stage the food 2 is in the initial stage of heating or where it is placed, the electromagnetic radiation means 4 is first controlled by the uniform heating control means 52. The uniform heating control means 52 continuously controls the stepping motor 10 to reciprocate the radiation antenna 9 or drive it at random with a period sufficiently faster than the rotation period of the motor 40, so that the heating chamber 1 can be controlled from below. Stir electromagnetic waves and distribute them roughly uniformly. Moreover, while the radiation antenna 9 is controlled by the stepping motor 10 by the uniform heating control means 52, it is distinguished whether or not it is the food 2 by the temperature rise at each detection position.
[0052]
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 dish 15 when the radiation antenna 9 is controlled by the stepping motor 10 by the uniform heating control means 52. The horizontal axis is the elapsed time from the start of heating, the vertical axis is the temperature change from the start of heating. The hatched area D indicates the temperature change in the portion that is not the food 2 such as the dish 15, and the area E is the food 2 It shows the temperature change. Thus, since the dish 15 has a smaller dielectric loss than the food 5, the electromagnetic wave is hardly absorbed and the temperature hardly rises, so that it can be clearly distinguished. The temperature change calculation means 53 stores, for example, the temperature corresponding to each detection position on the first round from the start of heating of the motor 40, and then the temperature corresponding to each detection position after the elapse of t1 time, The temperature difference ΔT is calculated. The temperature change comparison means 54 distinguishes the food difference 2 if the temperature difference ΔT, which is the calculation result of the temperature change calculation means 53, is greater than a predetermined value ΔT1 of the predetermined determination curve F, and the dish 15 if it is smaller.
[0053]
If the object to be heated extraction means 51 can distinguish whether each detection position is the food 2 or the dish 15, the heating mode switching means 55 controls the radiation antenna 9 from the uniform heating control means 52 to the local heating control means 56. Switch. The local heating control means 56 controls a location where electromagnetic waves concentrate while stopping the radiation antenna 9 at an appropriate position. Reference numeral 57 denotes a low-temperature portion extraction unit that extracts a portion having a low temperature from the detection positions determined as food 2 by the heated object extraction unit 51. The local heating control means 56 controls the position of the radiating antenna 9 so that the electromagnetic wave is radiated to the low temperature portion extracted by the low temperature partial extraction means 57. Further, when the local heating control means 56 emits electromagnetic waves to the low temperature portion of the food 2 so that the low temperature portion disappears from the food 2 and the whole becomes a uniform temperature, the uniform heating control means 52 may control the radiation antenna 9 again. .
[0054]
The low temperature partial extraction means 57 stores the detection position with the lowest detection temperature among the detection positions determined by the heated object extraction means 51 as the food 2 during one reciprocation of the infrared detection element 37 as the heating position. . While the reciprocation of the swing of the infrared detecting element 37 is repeated during one rotation of the motor 40, the heating position in each reciprocation of the swing is stored. The local heating control means 56 adjusts the angle of the radiating antenna 9 toward the stored heating position in the radial direction at the top of the radiating antenna 9 by the rotation of the motor 40, and the heating position, that is, in the food 2. The low temperature part is heated. By repeating this control, the low temperature portion disappears from the food 2 and the whole is uniformly heated.
[0055]
Further, as a simple method for reducing the number of times the stepping motor 10 that drives the radiation antenna 9 is driven, the detection positions of the infrared detection elements 37 are arranged on concentric circles. For the circumference that can be determined as food, the highest temperature in the circumference is extracted, and the low temperature extraction means 57 extracts the circumference having the lowest maximum temperature, You may adjust the angle of the radiation antenna 9 so that electromagnetic waves may concentrate. In this case, there is an effect of improving the durability performance of the radiation antenna 9.
[0056]
In addition, the meaning of the uniform of the uniform heating control means 52 expresses wide area heating with respect to local heating, and is not on the condition that heating is performed uniformly and uniformly.
[0057]
In the description of the above embodiment, the temperature distribution detection means 21 is used as the physical quantity detection means, but the present invention is not limited to this. For example, a solid-state imaging device called a CCD image sensor that can recognize the shape and color of food can be used. In this case, the control means only needs to control the electromagnetic wave radiation means based on the color changing with the progress of heating and its distribution. For example, if it is meat, the color of the whole is light brown to match the color that changes from red to light brown The electromagnetic wave radiation means is controlled so as to be finished. Further, the control means may control the electromagnetic wave radiation heating means based on the change in shape. For example, if there is a change that becomes soft and bulges if it is a cocoon, the electromagnetic wave radiation means is controlled so that the whole bulges in the same way. The same effect can be obtained by recognizing the shape from the light path blocking pattern using a plurality of light emitting elements and light receiving elements. In addition, if the control pattern of the electromagnetic wave radiation means that is optimal for the shape is stored in advance, the control means can control the electromagnetic wave radiation means by the initial shape recognition that can be recognized by the solid-state imaging device or the plurality of light emitting elements and light receiving elements. Is also possible. Further, if the control pattern of the electromagnetic wave radiation means optimal for the menu and the weight is stored in advance, the weight detection means can be used for control.
[0058]
(Example 6)
In the present embodiment, a configuration in which the control unit 6 controls the position of the electromagnetic wave radiation unit 4 by the setting unit 22 will be described.
[0059]
If FIG. 4 is used, the control means 6 will drive the stepping motor 10 according to the input of the setting means 22, and the antenna control means 24 will 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 the heating proceeds, based on the input contents of the setting means 22, if necessary, the stepping motor 10 is driven several times to control the heating unevenness, or the output of the magnetron 7 is changed. Heat until the end of heating.
[0060]
For example, it is assumed that the setting means 22 has a key “milk” as a representative means for inputting information related to the name of the food 2. Liquids like milk tend to cause convection due to heating and cause uneven heating in the vertical direction (the upper part tends to be hot and the lower part tends to become 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 position suitable for the bottom surface concentrated heating from the start to the end of heating (for example, the position shown in FIG. 6). Secure to.
[0061]
Further, it is assumed that the setting means 22 has a key “defrost” as a typical means for inputting the heating finish state. The food in the frozen state is a solid that does not generate convection, and each part must be heated evenly to eliminate uneven heating. Therefore, when “thawing” is selected by the setting means 22, the antenna control means 24 drives the stepping motor 10, and physical quantity detection means (for example, temperature distribution detection means, weight detection means described in the fifth embodiment, or other detection). The position of the radiation antenna 9 is changed according to the physical quantity of the food 2 detected by the means).
[0062]
(Example 7)
FIG. 14 is a characteristic diagram showing a control operation of the high-frequency heating device according to the seventh embodiment of the present invention.
[0063]
14A shows the time on the horizontal axis, and the power ON / OFF operation on the vertical axis. FIG. 14B shows the time on the horizontal axis and the position confirmation of the electromagnetic wave radiation means by the position confirmation means on the vertical axis. / OFF operation is shown. In the present embodiment, when the power of the high-frequency heating apparatus is turned on from OFF (when the power is turned on), the position confirmation is immediately turned from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave radiation means). This is because the position of the electromagnetic radiation means cannot be controlled when the power is turned off during heating such as a power failure, or the position of the electromagnetic radiation means changes when the power is off (for example, when carrying a high frequency heating device). However, if the power is turned on after that, the position confirmation means can quickly confirm the position of the electromagnetic wave radiation means, and the position can be accurately controlled.
[0064]
(Example 8)
FIG. 15 is a characteristic diagram showing a control operation of the high-frequency heating device according to the eighth embodiment of the present invention.
[0065]
FIG. 15 (a) shows time on the horizontal axis and ON / OFF operation of cooking on the vertical axis. FIG. 15 (b) shows time on the horizontal axis and the position confirmation of the electromagnetic wave radiation means by the position confirmation means on the vertical axis. ON / OFF operation is shown. In this embodiment, when the cooking is turned from ON to OFF (when cooking is finished), the position confirmation is immediately turned from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave radiation means). This is because when repeatedly cooking, it is considered that the electromagnetic wave radiating means is gradually shifted from the target position by moving the electromagnetic wave radiating means many times. This has the effect of promptly confirming the position and enabling accurate position control.
[0066]
Example 9
FIG. 16 is a characteristic diagram showing a control operation of the high-frequency heating device according to the ninth embodiment of the present invention.
[0067]
Although not shown, this embodiment has a door that is a typical opening / closing means for opening and closing the heating chamber, and a door latch switch that is an opening / closing detection means for detecting opening / closing of the door. FIG. 16A shows time on the horizontal axis, and the opening / closing operation of the door on the vertical axis. FIG. 16B shows time on the horizontal axis and ON of position confirmation of the electromagnetic wave radiation means by the position confirmation means on the vertical axis. / OFF operation is shown. In this embodiment, when the door is opened from the closed state (when the door is opened), the position confirmation is immediately switched from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave radiation means). This is because when the user opens the door during heating, the electromagnetic wave radiation means stops at a halfway position and cannot be controlled. This has the effect of promptly confirming the position of the means and enabling accurate position control.
[0068]
(Example 10)
FIG. 17 is a characteristic diagram showing a control operation of the high-frequency heating device according to Example 10 of the present invention.
[0069]
FIG. 17A shows time on the horizontal axis and the opening / closing operation of the door on the vertical axis. FIG. 17B shows time on the horizontal axis and ON of position confirmation of the electromagnetic wave radiation means by the position confirmation means on the vertical axis. / OFF operation is shown. In this embodiment, when the door is closed from opening (when the door is closed), the position confirmation is immediately switched from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave radiation means). This is because when the door is open, the user touches the electromagnetic wave radiation means and changes its position, which makes it impossible to control it. However, each time the door is closed, the position confirmation means quickly changes the position of the electromagnetic wave radiation means. This has the effect of confirming and enabling accurate position control.
[0070]
(Example 11)
18 to 26 are a configuration diagram and a characteristic diagram of the high-frequency heating device according to the eleventh embodiment of the present invention.
[0071]
FIG. 18 is a cross-sectional view of the inside of the heating chamber 1 as viewed from above. The electromagnetic wave is transmitted from the waveguide 12 (region in the wavy line) below the bottom surface of the heating chamber 1 to the radiation antenna 9. The position of the radiating antenna 9 is expressed by an angle θ (solid arrow line) with the position where the radiating antenna 9 is stopped by hitting the stopper 30 as 0 degree. FIG. 18 illustrates two states when the angle is 0 degrees and when the angle is 90 degrees. In the present embodiment, a driving signal exceeding the driving range is given to rotate the radiating antenna 9 counterclockwise, hit against the stopper 30 and stop, and this is confirmed as a 0 degree position. Then, the position of the radiation antenna 9 is controlled by providing a drive signal corresponding to the target angle with the position as a reference and rotationally driving it clockwise.
[0072]
FIG. 19 is a configuration diagram of the radiation antenna 9 as viewed from the front. The spacer 58 that holds the radiation antenna 9 at a constant height on the bottom surface of the heating chamber is made of a material with low high-frequency loss, such as Teflon, and is connected to the radiation antenna 9 and driven together. The position in the height direction is regulated by sliding while touching. Further, the spacer 58 forms a downwardly curved curved portion 59 in order to suppress friction.
[0073]
FIG. 20 is a configuration diagram of the turntable 16 as viewed from below. The turntable 16 includes a rotating shaft 29 and a holding unit 60 that holds food via a dish, and the holding unit 60 is located above the radiation antenna 9 as in FIG. The holding unit 60 includes a linear conductor 61 extending in two opposite directions from the rotating shaft 29, an annular conductor 62 connecting the two linear conductors 61, and linear conductors 63, 3 extending from the annular conductor 62 in three directions. It consists of an annular conductor 64 connecting two linear conductors 63. On both sides of the linear conductor 61, two transmissive portions 65 capable of transmitting electromagnetic waves are formed by the linear conductor 61 and the annular conductor 62, and similarly, the annular conductor 62, the linear conductor 63, and the annular conductor 64 form three transmission parts 65. A transmission part 66 is formed. Here, the larger the area of the transmission part, the easier the transmission of electromagnetic waves. However, when the width of the conductor is reduced, the strength of the entire holding part 60 becomes weaker, so an appropriate dimension is selected. In particular, the transmission part 65 is indispensable for intensively heating the bottom surface of the food. When 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 choose in. Incidentally, the wavelength λ of an electromagnetic wave often used in a microwave oven is 122 mm, and at this time, λ / 4 is 30.5 mm. Moreover, in the case of a present Example, it is set as H = 15mm and I = 50mm so that the bottom face of food can be heated more intensively.
[0074]
FIG. 21 to FIG. 24 are characteristic diagrams of the present embodiment, and show the temperature rise when the water in the same container as FIG. 43 is heated by changing the angle θ of the radiation antenna 9 in the configuration of FIG. 18 to FIG. It is.
[0075]
FIG. 21 shows a case where the angle θ is 30 degrees, and FIG. 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 of the conventional microwave oven of FIG. 44 is almost the same, and the heating proceeds from the edge and the center becomes cold.
[0076]
FIG. 22 shows the case where the angle θ is 60 degrees, and FIG. 22A shows the actual measurement data, and the right rear peak is lowered. 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.
[0077]
FIG. 23 shows the case where the angle θ is 90 degrees, and FIG. 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.
[0078]
FIG. 24 shows the results of FIGS. 21 to 23 with the angle θ of the radiating antenna 9 as the horizontal axis and the ratio of the individual temperature increase relative to the total temperature increase as the vertical axis. . J is the characteristic of the center and K is the characteristic of the average value of 4 corners. As the angle θ increases, J increases and K decreases. That is, in the range of 0 ≦ θ ≦ 90, it can be seen that as the angle θ increases, the proportion of electromagnetic waves concentrated at the center increases. Also, since the heating distribution greatly changes depending on the angle θ, it is possible to create an arbitrary heating distribution with high accuracy by controlling the position of the electromagnetic wave radiation means with the stopper 30 while confirming the position.
[0079]
For example, when thawing 300 g of beef sliced meat with the microwave oven of this embodiment, when the heating distribution is evaluated with the angle θ of the radiating antenna 9 stopped at one place, the radiation is radiated as shown in FIG. The best performance (state with little temperature unevenness) was obtained when the angle θ of the antenna 9 was 86.25 degrees.
[0080]
FIG. 26 is a characteristic diagram showing temperature unevenness at the end of thawing heating of 300 g of beef sliced meat. The measured temperature is plotted on the vertical axis, and the highest and lowest 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 angle θ of the radiation antenna 9 of this embodiment is 86.25 degrees. Is M (maximum temperature 36.1 ° C., minimum temperature −1.1 ° C., temperature difference 37.2), and the temperature unevenness is reduced in this embodiment. However, in both cases, heating conditions were such that the high-frequency output of about 300 w from the magnetron was turned on / off by the output control means, and the heating was performed at an apparent output of 170 w for 8 minutes.
[0081]
In the case of the present invention, when the angle θ is changed in the middle so that the slow-heating portion can be heated intensively while watching the progress of heating, the workmanship is improved.
[0082]
(Example 12)
FIG. 27 is a block diagram of the high-frequency heating device according to Embodiment 12 of the present invention.
[0083]
In FIG. 27, in order to heat the article 2 to be heated in the heating chamber 1 to a desired finished state, the electromagnetic wave radiating means 4 that radiates the electromagnetic wave 3 into the heating chamber 1 and the position of the electromagnetic wave radiating means 4 are correct. And a control means 6 for controlling the position of the electromagnetic wave radiation means 4 to an appropriate position for a 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 on the constituent materials.
[0084]
(Example 13)
FIG. 28 is a block diagram of the high-frequency heating device according to Embodiment 13 of the present invention.
[0085]
In FIG. 28, the electromagnetic wave radiation means 4 includes an electromagnetic wave generation means 7 for generating an electromagnetic wave 3 a, a waveguide means 8 for receiving the electromagnetic wave 3 a from the electromagnetic wave generation means 7 and guiding it into the heating chamber 1, and heating by the waveguide means 8. A radiating means 9 that receives the electromagnetic wave 3b guided into the chamber 1 and actually radiates it as the electromagnetic wave 3c, and a driving means 10 that drives the radiating means 9 by the control means 6 to change the heating distribution of the object to be heated 2 are provided. doing. The position confirming means 5 confirms the position of the radiating means 9 via the driving means 10 outside the heating chamber 1.
[0086]
(Example 14)
FIG. 29 is a principal block diagram of the high-frequency heating device according to Embodiment 14 of the present invention.
[0087]
In FIG. 29, the position confirmation means 5 has reference position detection means 67 for detecting that the electromagnetic wave radiation means 4 has reached the reference position, and detects that the position of the electromagnetic wave radiation means 4 is at the reference position. ing. The control means 6 controls the position of the electromagnetic wave radiation 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 radiation means 4 by the reference position detection means 67.
[0088]
(Example 15)
FIG. 30 is a cross-sectional configuration diagram of a main part of a microwave oven that is a typical high-frequency heating device according to the fifteenth embodiment of the present invention.
[0089]
In FIG. 30, as electromagnetic wave radiating 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 rotationally drives the coupling portion 13 by the stepping motor 10. The angle of the radiating antenna 9 is controlled. Here, the rotating 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 means 6 confirms that the radiation antenna 9 is at the reference position by the cam 69 and the switch 70 which are typical reference position detection means, and then controls the radiation antenna 9 to a desired position. When a stepping motor is used, positioning control can be accurately performed by the number of drive pulses after the switch 70 is pressed.
[0090]
Here, in this embodiment, the reference position is set to 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, thereby causing uneven heating. It is set as the structure which supplements.
[0091]
Therefore, since the position where heating is started is a reference position for confirming the position of the electromagnetic wave radiation means, there is an effect that heating can be started immediately after confirming the position.
[0092]
In addition, since the position of the radiation antenna 9 at the start of heating is always constant, in the case of the same food, the heating distribution generated at the initial stage of heating is also approximately constant. Therefore, the position of the radiating antenna 9 to be changed during heating in order to compensate for the heating unevenness 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.
[0093]
Furthermore, since the position of the radiation antenna 9 at the start of heating is a position at an angle of 90 degrees, the food can be heated centrally from the bottom center. Therefore, since electromagnetic waves easily enter the food before diffusing into the heating chamber 1, heating can be started most efficiently. In particular, when heating a liquid such as milk, it is more efficient to perform concentrated heating from the center of the bottom from the beginning to the end because the heating distribution is better and the position of the radiation antenna 9 does not have to be moved once.
[0094]
In addition to the combination of the cam 69 and the switch 70, the reference position can be confirmed by detecting various physical quantities as the reference position detection means.
[0095]
(Example 16)
FIG. 31 is a characteristic diagram showing a control operation of the high-frequency heating device according to Embodiment 16 of the present invention.
[0096]
FIG. 31A shows the time on the horizontal axis, the ON / OFF operation of the position confirmation of the electromagnetic wave radiation means by the position confirmation means, and FIG. 31B shows the time on the horizontal axis and the output control means on the vertical axis. This shows the ON / OFF operation of the high-frequency output from the electromagnetic wave radiation means. In this embodiment, when the position confirmation is switched from OFF to ON (the position confirmation means confirms the position of the electromagnetic wave radiation means), the high frequency output is turned from ON to OFF in advance (heating is interrupted). Further, after the position confirmation is turned from ON to OFF (position confirmation means finishes the position confirmation of the electromagnetic wave radiation means), the high frequency output is turned from OFF to ON (heating is resumed). This is because the position of the electromagnetic wave radiation means when confirming the position is not necessarily a position suitable for heating, and it is intended to prevent heating a part that is not aimed by radiating electromagnetic waves during the position confirmation. Therefore, there is an effect of preventing unnecessary heating unevenness.
[0097]
As another method, even if the high-frequency output is not reduced to 0 during position confirmation, it can be effectively reduced. In this case, since the 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.
[0098]
(Example 17)
FIG. 32 is a block diagram of the high-frequency heating device according to Embodiment 17 of the present invention.
[0099]
In FIG. 32, in order to heat the article 2 to be heated in the heating chamber 1 to a desired finished state, whether the electromagnetic radiation means 4 in the heating chamber 1 that emits the electromagnetic waves 3 and the positions of the electromagnetic radiation means 4 are correct. And a control means 6 for controlling the position of the electromagnetic wave radiation means 4 to an appropriate position for a desired heating distribution. In this embodiment, since the electromagnetic wave radiation means 4 is provided in the heating chamber 1, there is an effect of suppressing loss when electromagnetic waves are transmitted from the electromagnetic wave radiation means 4 into the heating chamber 1.
[0100]
(Example 18)
FIG. 33 is a block diagram of the high-frequency heating device according to Embodiment 18 of the present invention.
[0101]
In FIG. 33, in order to heat the article 2 to be heated in the heating chamber 1 to a desired finished state, the electromagnetic wave radiation means 4 in the heating chamber 1 that radiates the electromagnetic wave 3 and the position of the electromagnetic wave radiation means 4 are correct. And a control means 6 for controlling the position of the electromagnetic wave radiation means 4 to an appropriate position for a desired heating distribution. In this embodiment, since the electromagnetic wave radiation means 4 is provided in the heating chamber 1, there is an effect of suppressing loss when electromagnetic waves are transmitted from the electromagnetic wave radiation means 4 into the heating chamber 1. Moreover, since the position confirmation means 5 is located outside the heating chamber, it is not exposed to electromagnetic waves, so that there are few restrictions on the constituent materials.
[0102]
In the specific configurations described so far, a configuration having a turntable is mainly used, but the present invention is not limited to this. For example, instead of having no turntable, a method of driving the electromagnetic wave radiation means not only in one axis rotation but also in two dimensions can be considered. In this case, since the food is not moved, heavy food can be heated. 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 used.
[0103]
In addition, even if it is a case where it has a turntable, it is not limited to rotating a foodstuff on a plane. Various methods are conceivable, such as moving food up and down, combining up and down movement and movement on a plane, and controlling in association with the position of the electromagnetic radiation means. In this case, there is an effect that the heating distribution can be controlled more precisely.
[0104]
【The invention's effect】
As described above, the high-frequency heating device of the present invention has the following effects.
[0105]
Movable radiation antenna Confirm the position of the antenna Control the position of the radiation antenna Can be accurately controlled to a desired position, so that an object to be heated can be brought into a desired finished state.
[0106]
Also radiates when power is turned on antenna Since the position of the antenna Can be accurately controlled to a desired position without being uncertain.
[0107]
Also radiate after cooking antenna Because the position of the antenna Can be accurately controlled to a desired position without being uncertain.
[0108]
In addition, after detecting the opening and closing of the heating chamber, antenna If the user opens and closes during cooking, antenna Can be accurately controlled to a desired position without being uncertain.
[0109]
Also radiation antenna Detects that the reference position has been reached or emits antenna Is stopped at a reference position and the position is confirmed and controlled to a desired position, so that the positional deviation can be corrected.
[Brief description of the 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 device according to a second embodiment of the present invention.
FIG. 3 is a block diagram of a high-frequency heating device 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 cross-sectional configuration diagram of temperature distribution detection means of the high-frequency heating device according to Embodiment 5 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.
14A is a characteristic diagram of a high-frequency heating device according to Example 7 of the present invention. FIG.
(B) Characteristics chart
15A is a characteristic diagram of the high-frequency heating device according to Example 8 of the present invention. FIG.
(B) Characteristics chart
16A is a characteristic diagram of a high-frequency heating device according to Example 9 of the present invention. FIG. 16B is a characteristic diagram thereof.
17A is a characteristic diagram of the high-frequency heating device according to Example 10 of the present invention. FIG.
(B) Characteristics chart
FIG. 18 is a cross-sectional configuration diagram of a high-frequency heating device according to an eleventh embodiment of the present invention.
FIG. 19 is a configuration diagram of a radiating 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) Characteristics of the high-frequency heating device
(B) Characteristics chart
FIG. 22A is a characteristic diagram of the high-frequency heating device.
(B) Characteristics chart
FIG. 23 (a) Characteristics of the high-frequency heating device
(B) Characteristics chart
FIG. 24 is a characteristic diagram of the high-frequency heating device.
FIG. 25 is a configuration diagram of the main part of the high-frequency heating device.
FIG. 26 is a characteristic diagram of the 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 Embodiment 12 of the present invention.
FIG. 28 is a block diagram of a high-frequency heating device according to Embodiment 13 of the present invention.
FIG. 29 is a block diagram of a high-frequency heating device according to Embodiment 14 of the present invention.
FIG. 30 is a cross-sectional configuration diagram of a main part of a high-frequency heating device according to Embodiment 15 of the present invention.
FIG. 31A is a characteristic diagram of the high-frequency heating device according to Embodiment 16 of the present invention.
(B) Characteristics chart
FIG. 32 is a block diagram of a high-frequency heating device according to Embodiment 17 of the present invention.
FIG. 33 is a block diagram of a high-frequency heating device according to Embodiment 18 of the present invention.
FIG. 34 is a cross-sectional configuration diagram of a conventional high-frequency heating device.
FIG. 35 is a configuration 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 main part configuration diagram of another conventional high-frequency heating device.
FIG. 38 is a main part configuration diagram of the high-frequency heating device.
FIG. 39 is a cross-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 main part configuration diagram of the high-frequency heating device.
FIG. 42 is a cross-sectional configuration diagram of the main part of the high-frequency heating device
FIG. 43 is a structural diagram of a container.
44A is a characteristic diagram of another conventional high-frequency heating device. FIG.
(B) Characteristics chart
[Explanation of symbols]
1 Heating chamber
2 Food (to be heated)
3, 3a, 3b, 3c
4 Electromagnetic radiation means
5 Position confirmation means
6 Control means
7 Magnetron (electromagnetic wave generation means)
8 Waveguide means
9 Radiating antenna (radiating means)
10 Stepping motor (drive means)
11 Stopping means
12 Waveguide (waveguide means)
13 Coupling part (waveguide means)
19 Weight detection means (physical quantity detection means)
21 Temperature distribution detection means (physical quantity detection means)
22 Setting means
23 Output control means
30 Stopper (stop 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 (6)

A radiation antenna for radiating electromagnetic waves from a magnetron into a heating chamber to heat the object to be heated ; a position confirmation means having a reference position detection means for detecting that the radiation antenna has reached a reference position; and the reference position detection means based on signals from have a control means for controlling the position of the radiating antenna, the position confirmation means, high-frequency heating apparatus to ensure the that the radiating antenna is in the reference position at power-on. A radiation antenna that radiates electromagnetic waves from a magnetron into a heating chamber to heat an object to be heated, and a position confirmation means that has a stop means for stopping the radiation antenna at a reference position , the position confirmation means, A high-frequency heating apparatus , wherein the radiation antenna is applied to the stopping means when power is turned on . A radiation antenna for radiating electromagnetic waves from a magnetron into a heating chamber to heat the object to be heated ; a position confirmation means having a reference position detection means for detecting that the radiation antenna has reached a reference position; and the reference position detection means based on a signal from a control means for controlling the position of the radiating antenna, the position confirmation means, high-frequency heating apparatus to ensure the that the radiating antenna is in the reference position after the completion of cooking. A radiation antenna that radiates electromagnetic waves from a magnetron into a heating chamber to heat an object to be heated, and a position confirmation means that has a stop means for stopping the radiation antenna at a reference position , A high-frequency heating apparatus, wherein the radiation antenna is applied to the stopping means after cooking is completed. A radiation antenna for heating an object by radiating electromagnetic waves from the magnetron into the heating chamber, an opening and closing means for opening and closing the heating chamber, closed or from opening of the switching means is opened and closed to detect a change from the closed to the open a detection means, and position confirmation means having a reference position detecting means for detecting that said radiation antenna has reached the reference position, and control means for controlling the position of the radiating antenna based on a signal from the reference position detecting means has the position confirmation means, after detecting the open or closed by the opening and closing detecting means, high-frequency heating apparatus in which the radiation antenna is sure that the reference position. A radiation antenna that radiates electromagnetic waves from the magnetron into the heating chamber to heat the object to be heated, an opening / closing means for opening / closing the heating chamber, and an opening / closing detection for detecting a change from opening to closing or closing to opening of the opening / closing means And a position confirmation means having a stop means for stopping the radiation antenna at a reference position, and the position confirmation means stops the radiation antenna after the opening / closing detection means detects opening or closing. A high-frequency heating device characterized by being applied to the means .

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