JPH0927389A - High frequency cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency cooker for cooking a food at an optimum temperature capable of bringing out the taste of the food to the maximum by detecting the physical value of a material to be heated, and changing the electromagnetic wave distribution within a heating chamber according to the detected physical value. SOLUTION: Physical value detecting means 7 detects the physical value of a food l which is a material to be heated within a heating chamber 3. Control means 33 controls a waveguide motor 11a according to the physical value detected by the physical value detecting means 7 and rotates an antenna 10 within a feed chamber 9 to change the distribution of the electromagnetic wave emitted from a magnetron 4 within the heating chamber 3. The food 1 is heated with the optimum electromagnetic wave distribution according to the state of the food 1. The physical value detecting means 7 is preferably formed of temperature distribution detecting means for detecting the temperature distribution of the material to be heated. The control means 33 is preferably formed of uniform heating control means, local heating control means and heating mode switching means for switching the uniform heating control means and the local heating control means in the middle of the heating of the material to be heated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking appliance for high frequency heating for the purpose of automatic cooking.

[0002]

2. Description of the Related Art A conventional high-frequency heating cooker of this type is generally one disclosed in Japanese Patent Laid-Open No. 5-322188. The configuration will be described below with reference to FIG. FIG. 21 is a front sectional view for explaining a conventional example. 1 is an object to be heated such as food material, 2 is a round plate for cooking on which the object to be heated 1 is placed, 3 is a heating chamber for housing the object to be heated 1, 4 is a high frequency wave for heating the object to be heated The generated magnetron, 5 is a waveguide connecting the heating chamber 3 and the magnetron 4, and 6 is a movable variable matching element provided in the waveguide 5. Reference numeral 7 denotes an infrared sensor provided on the ceiling surface of the heating chamber 3 for detecting the surface temperature of the object to be heated. The viewing angle of the infrared sensor 7 indicated by the broken line 8 in the figure is set so as to cover the entire surface of the circular dish 2.

In this structure, the heating unevenness can be changed by changing the position of the variable matching element 6, and it is possible to change from the centralized type matching state to the wide-range dispersed type matching state. When the variable matching element 6 is moved in conjunction with the monitoring result of the infrared sensor 7, that is, when the temperature of the peripheral part of the object to be heated rises too much, the position of the variable matching element 6 is moved to the centralized position. If the temperature of the central portion is too high, the position of the variable matching element 6 is moved to the wide-range dispersion type position, for example, frozen swordfish and frozen tuna fillets are uniformly thawed and cooked.

[0004]

However, in the conventional high-frequency heating cooker, the position of the variable matching element in the waveguide is changed, so that the strong and weak portions of the periodic electromagnetic wave in the heating chamber 3 (constant). The electromagnetic wave distribution cannot be partially concentrated just by changing the existing wave generation pattern), so the heating distribution cannot be finely changed. In addition, since the standing wave generation pattern changes not only with the position of the variable matching element but also with the type, quantity, and shape of the object to be heated,
It is necessary to investigate the correlation of the standing wave generation pattern in the object to be heated. Moreover, the correlation cannot be understood unless the object to be heated is actually heated and its temperature change is observed, which requires time and causes an overheated portion during the process.

Therefore, the conventional high-frequency heating cooker is capable of uniformly heating the temperature only in a cooking menu in which the cooking time is relatively long, such as defrosting, and the allowable temperature range for finishing is wide. However, it is difficult to apply it in cooking with a narrow temperature range. In general, food has a temperature that maximizes the deliciousness of ingredients, for example, beef is 60 ° C, pork is 65 ° C, which is almost the protein coagulation temperature, and at the same time is the most digestive cooking temperature. . The above conventional example has a problem that it is extremely difficult to uniformly heat the whole body to such a temperature.

[0006] Further, since the correlation between the position of the variable matching element and the pattern of standing waves is not known without heating, it is especially desirable to heat foods having different optimum temperatures and finish them at the optimum temperatures, especially at low temperatures. There was also a problem that it would not be possible if the food to be finished was included.

SUMMARY OF THE INVENTION The first object of the present invention is to solve the above-mentioned conventional problems, and it is a first object of the present invention to provide a cooker for cooking at an optimum temperature that maximizes the deliciousness of food.

A second object is to finely change the heating distribution. A third purpose is to detect the temperature distribution finely with a simple structure.

A fourth object is to properly heat food without wasteful heating and reduce energy consumption.

A fifth object is to simultaneously cook different kinds of foods having different optimum temperatures at the respective optimum temperatures.

A sixth object is to simplify the operation and improve the usability for the user.

[0012]

In order to achieve the first object of the present invention, a heating chamber for accommodating an object to be heated, a high frequency generator for heating the object to be heated, and a physical quantity of the object to be heated are provided. The physical quantity detecting means for detecting, the distribution varying means for changing the electromagnetic wave distribution in the heating chamber, and the controlling means for controlling the distribution varying means by the physical quantity detected by the physical quantity detecting means are provided.

In order to achieve the first object of the present invention, the physical quantity detecting means is constituted by temperature distribution detecting means for detecting the temperature distribution of the object to be heated.

In order to achieve the first object of the present invention, the control means is a uniform heating control means for uniformly distributing the electromagnetic waves in the heating chamber by the distribution varying means, and a local heating control for concentrating the electromagnetic waves on a part. And a heating mode switching means for switching between the uniform heating control means and the local heating control means during the heating of the object to be heated.

In order to achieve the first object of the present invention, the user has menu setting means for setting a cooking menu, and the control means distributes the electromagnetic waves evenly in the heating chamber by the distribution varying means. Heating mode switching control including uniform heating control means, local heating control means for concentrating electromagnetic waves on a part, and heating mode switching means for switching between the uniform heating control means and the local heating control means during heating of an object to be heated. Means, heating mode non-switching control means for controlling the distribution varying means by the local heating control means from the beginning of heating, and the heating mode switching control means and heating mode non-switching control means by the setting menu of the menu setting means. The control mode selecting means for selecting is selected.

In order to achieve the second object of the present invention, the distribution varying means is provided with a waveguide having an opening in the heating chamber for introducing an electromagnetic wave, and a waveguide for moving the waveguide. It is configured to have a pipe moving means.

In order to achieve the second object of the present invention, the heating chamber is provided with a mounting table on which an object to be heated is mounted and a rotating means for rotating the mounting table, and the opening of the waveguide is It is configured such that it can move from the vicinity of the rotation center of the mounting table to the surroundings.

In order to achieve the second object of the present invention, the distribution varying means is provided with an opening for introducing an electromagnetic wave into the heating chamber, and an opening position varying means for changing the position of the opening. It was done.

In order to achieve the second object of the present invention, the heating chamber is provided with a mounting table on which the object to be heated is mounted, and a rotating means for rotating the mounting table, and the variable range of the opening is set in front. The configuration is such that the position around the center of rotation of the writing table extends to the surroundings.

In order to achieve the second object of the present invention, the opening is provided on the bottom surface of the heating chamber.

In order to achieve the third object of the present invention, the heating chamber is provided with a mounting table on which an object to be heated is mounted and a rotating means for rotating the mounting table, and the temperature distribution detecting means is an infrared temperature sensor. A detector and a drive means for reciprocating the detection point of the infrared temperature detector in the radial direction of rotation of the mounting table, and the rotation cycle of the rotation means is an integral multiple of the cycle of the drive means. It is configured.

Further, in order to achieve the fourth object of the present invention, the control means includes a heated object extracting means for extracting a heated object portion from the temperature distribution detecting means, and a heated object extracted by the heated object extracting means. The low temperature part extracting means extracts the low temperature part from the heated material part, and the local heating control means controls the distribution varying means based on the extraction result of the low temperature part extracting means.

In order to achieve the fourth object of the present invention, the object-to-be-extracted means comprises temperature change calculation means for calculating a temperature change from the beginning of heating at each detection point of the temperature distribution detection means, and The object to be heated is a detection point having a calculation result of the temperature change calculation means and a temperature change comparison means for comparing with a predetermined value, and the calculation result of the temperature change calculation means is larger than a predetermined value from the comparison result of the comparison means It is configured.

Further, in order to achieve the fourth object of the present invention, the object-to-be-extracted means comprises temperature change calculation means for calculating a temperature change from the beginning of heating at each detection point of the temperature distribution detection means, and The configuration is provided with a contour extraction unit that calculates the difference between the calculation result of the temperature change calculation unit and the adjacent detection location to extract the contour of the object to be heated.

In order to achieve the fifth object of the present invention, the control means includes a heating range setting means for setting a heating range by a user and a low temperature part in the heating range set by the heating range setting means. The low temperature partial extraction means for extracting and the local heating control means based on the extraction result of the low temperature partial extraction means have a variable distribution control section for controlling the variable distribution means.

In order to achieve the sixth object of the present invention, the heating range setting means includes a registration means for registering the heating range set by the user together with a registration code, and a heating range registered by the registration means. The registration storage means stores the registration code together with the registration code, and the registration calling means calls the heating range corresponding to the registration code by the user.

[0027]

According to the present invention, the control means controls the distribution varying means in accordance with the physical quantity of the object to be heated detected by the physical quantity detecting means, so that the object to be heated can be heated with an optimum electromagnetic wave distribution. You can

Further, since the control means controls the distribution varying means according to the temperature distribution of the object to be heated detected by the temperature distribution detecting means, the object to be heated can be heated with an optimum electromagnetic wave distribution according to the temperature distribution of the object.

The uniform heating control means heats the object to be heated by evenly distributing the electromagnetic waves in the heating chamber by the distribution varying means, and the local heating control means varies the distribution according to the temperature distribution of the object to be heated generated by the electromagnetic wave. Since the means is controlled, the object to be heated can have a uniform temperature.

According to the menu set by the user by the menu setting means, the uniform heating control means is switched to the local heating control means to control the distribution varying means, or the distribution heating means is controlled only by the local heating controlling means from the beginning. Since this is selected, heating can be performed with an optimum heating distribution according to the menu.

Further, since the waveguide for introducing the electromagnetic wave into the heating chamber is moved by the waveguide moving means, the location where the electromagnetic wave is concentrated can be finely changed.

Further, since the opening of the waveguide for introducing the electromagnetic wave into the heating chamber can be moved within the range from the vicinity of the center of the rotating mounting table to the surroundings, the location where the electromagnetic wave is concentrated can be finely changed.

Further, since the position of the opening serving as the outlet of the electromagnetic wave in the heating chamber is changed by the opening position changing means, it is possible to finely change the electromagnetic wave concentrated portion.

Further, since the position of the opening serving as the outlet of the electromagnetic wave in the heating chamber can be changed within the range from the vicinity of the center of the rotating mounting table to the periphery thereof, the location where the electromagnetic wave is concentrated can be finely changed.

Since the opening is provided on the bottom surface of the heating chamber, it is close to the object to be heated, and the location where the electromagnetic waves are concentrated can be finely changed.

Further, since the mounting table is rotated and the driving means reciprocates the infrared temperature detector in the radial direction of rotation of the mounting table, the temperature distribution of the object to be heated can be detected.

Further, the object to be heated extracting means extracts the part to be heated by the temperature distribution detecting means and the low temperature part extracting means extracts the low temperature part from the object to be heated, so that the electromagnetic waves can be concentrated appropriately without waste. You can

The temperature change calculation means calculates the temperature change at each detection point from the beginning of heating, and the temperature change comparison means compares the temperature change at each detection point with a predetermined value to detect a detection point larger than the predetermined value. The object to be heated can be extracted by using the object to be heated.

Further, since the temperature change calculating means calculates the temperature change at each detection point from the beginning of heating and the contour extracting means calculates the difference in temperature change between the adjacent detection points to extract the contour of the object to be heated. The object to be heated can be extracted.

Further, since the low temperature portion extracting means extracts the low temperature portion within the heating range set by the user by the heating range setting means, only the portion desired by the user can be heated.

The heating range is registered together with the registration code by the registration means, is stored in the registration storage means, and the heating range can be called and set by the registration calling means by the registration code, so that the user's operation can be simplified.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing the configuration of a high-frequency heating cooker according to a first embodiment of the present invention. Further, FIG. 2 is a cross-sectional view of the essential part of the electromagnetic wave emission part of the embodiment. FIG.
FIG. 3 is a cross-sectional view of the essential part of the physical quantity detecting means of the embodiment.
Further, FIG. 4 is a characteristic diagram showing the detection characteristic of the physical quantity detecting means of the embodiment. FIG. 5 is a block diagram for explaining the control operation in the same embodiment. FIG. 6 is a characteristic diagram showing the characteristics of temperature change in the same example. The same components as those in the conventional example are designated by the same reference numerals for convenience.

Reference numeral 1 is a food to be heated, 2 is a plate on which the food 1 is placed, 3 is a heating chamber for heating the food 1, 4 is a magnetron which is a high-frequency generating means, and electromagnetic waves emitted from the magnetron 4 are conducted. The food 1 is radiated into the heating chamber 3 via the wave tube 5 and the power feeding chamber 9 to heat the food 1 in the heating chamber 3. An antenna 10 is provided in the power feeding chamber 9, and the antenna 10 is configured to be rotated by a waveguide motor 11a which is a waveguide moving means. The electromagnetic wave in the waveguide 5 is extracted by the antenna 10. Since the antenna 10 has directivity in the radiation direction of the electromagnetic wave, it is apparently the same as the movement of the waveguide including the opening. The waveguide motor 11a is a stepping motor, and is used for initial position adjustment by using an origin detection switch or a stopper, and thereafter, the moving angle from the initial position is successively accumulated so that the rotation angle can be always known. There is something.

The power supply chamber 9 is covered with a cover 12. The cover 12 is made of a low-loss material that does not easily absorb electromagnetic waves from the heating chamber 3 side, and is provided so that the bottom surface of the heating chamber 3 is not uneven. This prevents the fragments of the food 1 and seasonings from entering the power supply chamber 9 and facilitates cleaning.

A turntable 13 serves as a mounting table on which the food 1 and the plate 2 are placed. The turntable 13 is rotated by a turntable motor 14 which is a rotating means at a constant cycle. The center of rotation of the turntable motor 14 is substantially in the center of the bottom surface of the heating chamber 3, while the center of rotation of the waveguide motor 11a is at a position displaced from the center of the bottom surface of the heating chamber 3, and the center of the bottom surface and the peripheral portion are almost the same. It is located in the middle. With this positional relationship, the antenna 10 can change the heating portion of the turntable 13 in the radial direction, and in combination with the rotation of the turntable 13, an arbitrary position on the turntable 13 can be heated.

FIG. 2 shows a cross section taken along the line AA 'in FIG.
In FIG. 2A, the direction (directivity) of the antenna 10 is the same as in FIG. 1, and the electromagnetic waves are radiated toward the center as indicated by the arrow. In FIG. 2B, the orientation of the antenna 10 is the outer orientation rotated by 180 degrees as compared with FIG. 1, and the electromagnetic wave is radiated outward as indicated by the arrow. In addition, electromagnetic waves are radiated in accordance with the orientation of the antenna 10 even at intermediate positions between the center and the outside, and the vicinity of the radiation of the electromagnetic waves is heated most. In this way, if the direction of the antenna 10 is changed according to the rotation angle of the waveguide motor 11a, the heating chamber 3
Since the distribution of electromagnetic waves inside the waveguide motor 11a changes,
Is used as the variable distribution means.

The physical quantity detecting means 7 is composed of a temperature distribution detecting means including an infrared temperature detector, and an opening 15 is provided on the ceiling surface of the heating chamber 3 for securing an optical path, and electromagnetic waves are provided near the opening 15 in the heating chamber. 3 Choke structure 1 to prevent leakage to the outside
6 are formed.

Next, the temperature distribution detecting means 7 will be described. FIG. 3 shows a BB ′ cross section of FIG. 1. Heating chamber 3
An opening 15 is provided on the ceiling surface 17 of the above, and the choke structure is composed of two kinds of metal plates 16a and 16b. Reference numeral 16a denotes an optical path, which is a cylindrical metal part having a spread on the ceiling surface 17 and is in close contact with the ceiling surface 17. Reference numeral 16b is a box-shaped metal component having a small hole 18 and is in close contact with the ceiling surface 17. Infrared rays from the inside of the heating chamber 3 go out through the small holes 18 by the choke structures 16a and 16b, but electromagnetic waves in the heating chamber 3 are blocked and hardly leak outside. In FIG. 3, the dimension L is designed to be λ / 4, that is, if the frequency is 2.45 GHz and it is set to 30 mm, the impedance in the small hole 18 becomes infinite and the electromagnetic wave shielding effect is the largest. Further, if the dimension L is halved to 15 mm, the impedance becomes infinite at the opening 15 of the ceiling surface 17, and similarly, the electromagnetic wave blocking effect is large and the size can be reduced.

In FIG. 3, reference numeral 19 denotes an output that correlates with the amount of infrared light entering the pyroelectric infrared detecting element, that is, the temperature at the position in the heating chamber 3 which is the visual field. The infrared detection element 19 is fixed inside the fixing member 20, and the field of view is narrowed through a lens 21 attached to the fixing member 20 to detect the temperature in a narrow range. The lens 21 is a Fresnel lens and is made of a material that transmits infrared rays. Reference numeral 22 denotes a stepping motor, which rotates the pinion gear 24 and the chopper 25 with the first rotation shaft 23.

The chopper 25 forms a slit and rotates while opening and closing the optical path leading to the infrared detecting element 19.
The small gear 24 is in contact with the large gear 26, a second rotating shaft 27 is attached to the large gear 26, and the second rotating shaft 27 is rotatably attached by a receiving portion 28. In addition, the second rotary shaft 2
A printed circuit board 29 is attached to 7
In addition to the infrared detecting element 19, an electronic circuit (not shown) such as an amplifier circuit is attached to the. These are housed in a metal case 31 having a small hole 30 at a position that serves as an infrared light path, covered with a metal lid 32, and fixed to the choke structure 16b with a metal lid 32.

With this structure, the stepping motor 22 swings the infrared detecting element 19 from the front to the back in FIG. 3, and at the same time, the chopper 25 both opens and closes the optical path. The swing cycle of the infrared detection element 19 is set to an integral fraction of the rotation cycle of the turntable motor 14, that is, the rotation cycle of the turntable motor 14 is set to an integral multiple of the rotation cycle of the infrared detection element 19. Motor 1
The temperature at the same position can be detected for each rotation of 4.

FIG. 4 shows the detection position of the infrared detecting element 19. The detection field of the infrared detection element 19 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 19 swings one way to change five temperature detection positions. By the combination of the swing and the rotation of the turntable motor 14, the detection position covers the entire plate 2 and the temperature distribution can be detected two-dimensionally. Further, since the turntable motor 14 rotates at a cycle that is an integral multiple of the swing of the infrared detection element 19, a temperature difference from the temperature of the turntable one round before or a temperature change from the initial stage can be obtained for each detection position. Is.

Next, the control operation of the control means 33 will be described with reference to FIG.
This will be described below. The control means 33 controls the waveguide motor 11a according to the temperature distribution detected by the temperature distribution detection means 7. First, whether the detected temperature is the temperature of the food 1 or not.
Alternatively, the object-to-be-extracted means 34 distinguishes whether the temperature of the plate 2 or the wall surface of the heating chamber 3 is the temperature for each detection position.
At the initial stage of heating, it is not known what size the food 1 is, at what position it is placed, etc. Therefore, the uniform heating control means 35 first controls the waveguide motor 11a. The uniform heating control means 35 is the turntable motor 14
The electromagnetic wave is agitated and uniformly distributed in the heating chamber 3 by rotating the electromagnetic wave in a cycle sufficiently faster than the rotating cycle, reciprocating in half rotation, or driving randomly. While the waveguide motor 11a is being controlled by the uniform heating control means 35, whether the food 1 is or not is distinguished by the temperature increase at each detection position.

FIG. 6 shows the surface temperature change of the food 1 and the temperature change of the portion other than the food 1 such as the dish 2 when the driving of the waveguide motor 11a is controlled by the uniform heating control means 35.
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 C indicates the temperature change of a portion other than the food 1 such as the plate 2, and the area D indicates the food 1. It shows the temperature change. As described above, since the plate 2 has a smaller dielectric loss than the food 1, electromagnetic waves are hardly absorbed and the temperature hardly rises, so that the plate 2 can be clearly distinguished. The temperature change calculation means 36 stores, for example, the temperatures corresponding to the respective detection positions on the first turn from the start of heating of the turntable motor 14, and the temperature corresponding to the respective detection positions after t1 time has elapsed from the temperature on the first turn. The temperature difference ΔT from the temperature is calculated. The temperature change comparing means 37 distinguishes between the food 1 and the dish 2 if the temperature difference ΔT, which is the calculation result of the temperature change calculating means 36, is larger than a predetermined value ΔT1.

If it is possible to distinguish whether the detection position is the food 1 or the dish 2 by the heated object extraction means 34, the heating mode switching means 38 locally controls the waveguide motor 11a from the uniform heating control means 35. Switch to the heating control means 39. The local heating control means 39 controls the location where electromagnetic waves concentrate while stopping the waveguide motor 11a at an appropriate position. Reference numeral 40 denotes a low-temperature partial extraction means, which extracts low-temperature portions from the detection positions where the object-to-be-extracted extraction means 34 determines the food 1. The local heating control means 39 controls the drive of the waveguide motor 11a so that the electromagnetic waves are radiated to the low temperature portion extracted by the low temperature part extraction means 40. When the local heating control means 39 radiates an electromagnetic wave to the low temperature portion of the food 1 so that the low temperature portion disappears from the food 1, the uniform heating control means 34 controls the waveguide motor 11a again. Is also good.

The low temperature part extracting means 40 is the infrared detecting element 1.
The object-to-be-heated extraction means 34 moves between the food 1
The detection position having the lowest detection temperature among the detection positions determined to be is stored as the heating position. Although the reciprocation of the swing of the infrared detection element 19 is repeated during one revolution of the turntable motor 14, the heating position in each one reciprocation of the swing is stored. Rotation of the turntable motor 14 causes the local heating control means to move toward the stored heating position in the radial direction above the antenna 10 by the waveguide motor 11a.
Is adjusted to heat the heating position, that is, the low temperature portion of the food 1. By repeating this control, the food 1 does not have a low temperature portion and is uniformly heated.

As a simple method of reducing the number of times of driving the waveguide motor 11a, the detection positions of the infrared detecting elements are arranged on concentric circles, and whether the food 1 or the plate 2 is provided in the concentric circles. For the circumference that can be determined as food, the maximum temperature within the circumference is extracted, and the low temperature part extraction means 40 extracts the circumference with the lowest maximum temperature, and the radio wave is emitted on the circumference. You may adjust the angle of the waveguide motor 11a so that it may concentrate. In this case, there is an effect of improving the durability performance of the waveguide motor 11a.

The uniformity of the uniform heating control means 34 expresses wide-area heating with respect to local heating, and does not require complete uniform heating.

Further, although the physical quantity detecting means is the temperature distribution detecting means in the description of the first 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 the food 1 can be used. In this case, the control means may control the distribution varying means based on the color that changes with the progress of heating and its distribution.For example, in the case of meat, the color of the whole is light brown to match the color that changes from red to light brown to whitish. The distribution varying means is controlled so that the finish is completed. Further, the control means may control the distribution varying means based on the change of the shape. For example, since the rice cake becomes soft and swells, the distribution varying 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 distribution varying means according to the shape is stored in advance, the control means can control the distribution varying 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, the weight sensor can be used as the physical quantity detecting means if the optimum control pattern of the distribution varying means according to the menu and the weight is stored in advance.

Further, although the control means has the constitution having the uniform heating control means, the local heating control means and the heating mode switching means in the description of the first embodiment, the present invention is not limited to this. For example, a case where the uniform heating control means and the heating mode switching means are not provided will be described with reference to FIG. FIG. 7 is a block diagram illustrating the control operation of the high-frequency heating cooker. In this case, whether the object to be heated extraction means 1 is the food 1 or the plate 2 is distinguished from the beginning of heating. Temperature change comparison means 37
Is momentarily compared with a predetermined temperature change determined by the elapsed heating time, and if it is larger than the predetermined temperature change, it is distinguished from the food 1 and if it is smaller than the dish 2. This predetermined temperature change is a function determined by the elapsed heating time and is shown by a straight line E in FIG. At the beginning of heating, the temperature change of food 1 is small and food 1 and plate 2 are small.
However, since the error is corrected as the heating progresses, it does not significantly affect the overall heating distribution.

Besides, at the beginning of heating, the waveguide motor 11a is used.
There is also a method of fixing at a predetermined position. In general, the food 1 is often placed in the center of the heating chamber 3, and moreover, it is often shaped such that the surroundings are easily heated and the center is not easily heated. Therefore, as shown in FIG. 10 direction is fixed and heated. Even in this method, the initial optimum heating position may be erroneous, but the error is corrected as the heating progresses, and the overall heating distribution is not greatly affected. In addition, the initial fixed position is shown in FIG.
Even at the periphery shown in (b) or at other positions, the heating position is controlled appropriately as the heating progresses, so that the same effect is brought about.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram for explaining the control operation of the high-frequency cooker according to the second embodiment of the present invention. still,
The same components as those in the first embodiment are designated by the same reference numerals. Reference numeral 41 is a menu setting means for the user to set a cooking menu. The menu setting means 41 is a key corresponding to the cooking menu, for example, a "warm up" key 41.
a, "defrost raw food" key 41b, "milk" key 41c
Etc., and the user presses any key to set the cooking menu. Reference numeral 42 denotes a control mode selection means, which controls the waveguide motor 11a to a heating mode switching control means 43 according to the cooking menu set by the menu setting means 41.
The mode is selected to be controlled by or the heating mode non-switching control means 44. The control operation of the heating mode switching control means 42 is performed as in the first embodiment. That is, at the beginning of heating, the uniform heating control means 35 controls the waveguide motor 11a so that the object to be heated extraction means 34 distinguishes between the food 1 and the dish 2, and then the low temperature part extraction means 40 detects the low temperature. Local heating control means 3 according to part
9 controls the waveguide motor 11a. On the other hand, the heating mode non-switching control means 44 controls the waveguide motor 11a only by the local heating control means 39 from the beginning of heating.

For cooling, reheating of rice, reheating of boiled or grilled food, or the like, the local area may be intensively heated, and the local position may be changed so that a uniform temperature distribution is obtained. The same applies to thawing meat and fish. However, when liquid such as milk is intensively heated from the bottom of the container in which it is contained, convection occurs and uniform heating can be achieved throughout the height. Therefore, as shown in FIG. 2A, the waveguide motor 11a is generally placed at the center of the heating chamber 3, and the position of the antenna 10 may be fixed so that the center is locally heated. When not placed in the center, the position of the milk container is detected by the heated object extraction means 34, and the waveguide motor 11a sets the position of the antenna 10 so that the position passes through the position of the antenna 10. Just fix it. When a plurality of concentric circles are placed, if the concentric circles are located on the concentric circles, the position of the concentric circles is locally heated.
The position of 0 should be fixed. When a plurality of antennas are not placed concentrically, the waveguide motor may change the direction of the antenna 10 each time according to the position of the milk container passing near the antenna 10.

In the control operation, the user first presses the key for setting the cooking menu. If the pressed key is the "warm" key 41a or the "decompress" key 41b, the control mode selection means 42 selects the heating mode switching control means 43 and the uniform heating control means 35 causes the waveguide motor 11a at the beginning of heating. Then, the local heating control means 39 controls the waveguide motor 11a. If the key pressed by the user is the "milk" key, the control mode selection means 42 selects the heating mode non-switching control means 44. In this case, the local heating control means 39 first controls the waveguide motor 11a to control the antenna 10a.
Is fixed so that the center of the heating chamber 3 is locally heated. If it is possible to recognize that the position of the milk container is the center by the heated object extraction means, locally heat the center as it is, and if it is possible to recognize that the position of the milk container is not the center or there are multiple positions, the center of the detection position of the milk container is localized. The waveguide motor 11a is controlled so that the antenna 10 can be heated and the position of the antenna 10 is set.

When the position of the milk container is not in the center, the magnetron may be stopped by the rotation of the turntable at a time zone apart from the antenna 10 so that electromagnetic waves cannot enter the heating chamber 3. . In this case, although heating takes time, there is an effect that the temperature distribution can be further improved and unnecessary energy consumption is not performed. Also, sake, miso soup, coffee, etc. are similar to milk, and the same effect can be obtained by adding a new menu to the menu setting means 41 set by the user.

Next, a third embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 9 is a sectional view showing the structure of a high frequency heating cooker according to a third embodiment of the present invention. Further, FIG. 10 is a cross-sectional view of an essential part of the electromagnetic wave radiation part of the embodiment. FIG.
1 is a characteristic diagram for explaining the heating region of the same embodiment. FIG. 12 is a cross-sectional view of the main parts of the temperature distribution detecting means of the embodiment. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The third embodiment has a structure in which a turntable motor as a rotating means is not used. The electromagnetic wave emitted from the magnetron 4 is radiated into the heating chamber 3 via the waveguide 5 and the power feeding chamber 9, and heats the food 1 in the heating chamber 3. Power supply room 9
An antenna 10 is provided inside, and the antenna 10 is configured to rotate by a waveguide motor 11a which is a waveguide moving means. Reference numeral 12 is a cover that covers the power supply chamber 9. The waveguide motor 11a is a stepping motor, and the first rotation shaft 45
To rotate. A large gear 46 is attached to the first rotating shaft 45. Reference numeral 47 denotes a peripheral gear that forms a gear inside and has a groove that serves as a bearing for the small gear 48.
Attached and fixed. The small gear 48 is in contact with the large gear 46 and the peripheral gear 47, a second rotating shaft 49 is attached to the small gear 48, and the second rotating shaft 49 is rotatably attached using a groove provided in the peripheral gear 47 as a bearing. Has been. The antenna 10 is attached to the second rotating shaft 49. When the waveguide motor 11a rotates in this configuration, the second
The rotating shaft 49 moves along the peripheral gear 47 around the large gear 46 while repeatedly rotating. Waveguide motor 11a
The position and orientation of the antenna 10 can be adjusted by performing initial positioning using the origin detection switch, using a stopper, etc., and then sequentially accumulating movement angles from the initial position so that the rotation angle can always be known. Both are understood.

FIG. 10 shows a cross section taken along the line FF 'of FIG. Reference numeral 50 is a rail hole through which the antenna 10 is provided, which is provided on the upper wall surface of the waveguide 5 and the bottom surface of the power feeding chamber 9, and 51 is the waveguide 5.
Is a rail hole through which the second rotary shaft 49 provided on the bottom surface of the rail passes. In FIG. 10, the antenna 10 is oriented toward the center, and electromagnetic waves are emitted toward the center as indicated by the arrow. FIG. 11 shows the locus of movement of the electromagnetic wave radiating portion 52 of the antenna 10 when the antenna 10 moves in the rail hole 50 while rotating. Since the electromagnetic wave radiation portion of the antenna 10 is heated most, it is possible to intensively locally heat any position in almost the entire area of the heating chamber 3.

FIG. 12 is a sectional view of the principal part of the temperature distribution detecting means, showing a section taken along line GG 'of FIG. In FIG. 12, the same components as those in FIG. 3 of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. 22 is a stepping motor,
Pivot the infrared detection element 19 from the front to the back in FIG.
At the same time, the chopper 25 both opens and closes the optical path. Reference numeral 53 is a drive means for driving the entire metal case 31 including the infrared detection element 19, and is constituted by a stepping motor. The stepping motor 53 rotates the rotating shaft 54, drives the connecting portion 55 attached to the rotating shaft, and swings the infrared detecting element 19 in the left-right direction in FIG. Here, the swinging cycle of the stepping motor 53 is driven to be an integer multiple, which is sufficiently slower than the swinging cycle of the stepping motor 22, and the temperature at the same position can be detected for each reciprocating swing of the stepping motor 53. With this configuration, the temperature of the entire region in the heating chamber 3 can be detected, and the temperature distribution can be detected two-dimensionally. Further, since the temperature at the same position can be detected for each reciprocating swing of the stepping motor 53, the temperature difference from the temperature before one reciprocating and the temperature change from the initial stage can be calculated for each detecting position.

The control means 33 initially rotates the waveguide motor 11 in a constant cycle to perform uniform heating control, and when the food is extracted, the low temperature part is extracted from the extracted food and the position of the low temperature part is extracted. The angle of the waveguide motor 11a is controlled so that the antenna 10 faces toward the front. Food 1 by repeating this
Since there is no low temperature part, it can be heated to a uniform temperature throughout. In the case of this embodiment, since the food 1 is not rotated, it is possible to heat a heavy food, and there is an effect that the space in the heating chamber 3 can be effectively utilized. Although the above embodiment has been described with the configuration in which the position and the direction of the antenna 10 are controlled by one waveguide motor, this does not limit the present invention, and the direction and the position of the antenna 10 are different. It may be controlled by a motor or may be controlled by linear two-axis movement. These have the effect that local heating can be performed more finely.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 13 is a cross-sectional view of the configuration of the high frequency heating cooker according to the fourth embodiment of the present invention. FIG.
4 is a cross-sectional view of an essential part of the electromagnetic wave emission part of the embodiment. still,
The same components as those in the first to third embodiments are designated by the same reference numerals and the description thereof will be omitted.

In the fourth embodiment, an aperture position changing means is provided as a distribution changing means. In FIG. 13, the electromagnetic wave emitted from the magnetron 4 passes through the waveguide 5 and the heating chamber 3
The food 1 on the plate 2 placed inside is heated. The opening for connecting the waveguide 5 and the heating chamber 3 to guide the electromagnetic wave is such that the first opening 56 is located near the center of the heating chamber 3, the second opening 57 is located near the heating chamber 3, and The turntables 13 are arranged side by side in the radial direction of rotation. Reference numeral 58 denotes a shield plate that shields one of the openings 56 and 57, and has a semicircular metal plate structure, and is rotated by a rotating shaft 59 made of a low-loss material that does not easily absorb electromagnetic waves. 1
Reference numeral 1b denotes an opening position varying means, which is constituted by a stepping motor and rotates the rotating shaft 59 to close either one of the openings 56 and 57 by the shield plate 58. With this configuration, the position of radiating electromagnetic waves in the heating chamber 3 changes,
The portion of the food product 1 immediately above the unobstructed opening is locally heated in a concentrated manner. It is also possible to uniformly heat the food 1 by rotating the shielding plate 58 at a constant cycle.

FIG. 14 shows a cross section taken along the line HH 'of FIG. Each of the openings 56 and 57 has a rectangular shape, and the bottom surface of the heating chamber 3 having the same rectangular shape is parallel to the four sides. FIG.
13A, as in FIG. 13, the first opening 56 is closed by the shielding plate 58, and the electromagnetic wave is radiated into the heating chamber 3 from the second opening 57. Therefore, in the food 1, the vicinity of the heating chamber 3 is provided. Locally heat the part located at. On the contrary, in FIG. 14B, since the shielding plate 58 closes the second opening 57 and radiates the electromagnetic wave into the heating chamber 3 from the first opening 56, the electromagnetic wave is emitted to the vicinity of the center of the heating chamber 3 in the food 1. Locally heat the location.

Initially, the control means 33 rotates the shielding plate 58 at a constant cycle to perform uniform heating control, and if the food 1 is extracted from the temperature distribution detected by the temperature distribution detecting means 7, the food 1
The low temperature part is extracted from the inside and stored as the heating position. Optimal local heating control is performed by switching the position of the shield plate 58 momentarily according to the heating position in the radial direction with the openings 56 and 57 by the rotation of the turntable 13, and the low temperature part is eliminated from the food 1 by repeating this. The whole is heated uniformly.

Although the present embodiment has been described as a structure which can be made simple and small by providing two openings and rotating a semicircular metal plate, these do not limit the present invention and the number of openings is limited. It is possible to control the local heating more finely, and the shielding plate may be moved linearly instead of being rotated. Also, the same effect can be obtained by providing a shielding plate in each of the plurality of openings.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 15 is a sectional view showing the structure of a high frequency heating cooker according to a fifth embodiment of the present invention. FIG.
6 is an enlarged view of a main part of the electromagnetic wave emission part of the embodiment. still,
The same components as those in the first to fourth embodiments are designated by the same reference numerals and the description thereof will be omitted.

The fifth embodiment has a structure in which the opening position changing means is provided as the distribution changing means and the turntable motor as the rotating means is not used. In FIG. 15, the electromagnetic wave emitted from the magnetron 4 heats the food 1 on the dish 2 placed in the heating chamber 3 via the waveguide 5. Waveguide 5 and heating chamber 3
The opening position of the first shield plate 59 and the second shield plate 60 is determined by the first shield plate 59 and the second shield plate 60 for connecting the and to guide the electromagnetic wave.
The first shield plate 59 has a cutout portion 61, and the second shield plate 60 has a cutout portion 63. The combined position of the cutout portions 62 and 63 is the opening position.

The first shield plate 59 rotates the shaft 63 by the rotation of the first stepping motor 11c which is the opening position changing means.
It rotates around. The 1st stepping motor 11c rotates the 1st rotating shaft 64, the 1st gearwheel 65 is attached to the 1st rotating shaft 64, and the 1st gearwheel 65 rotates. Gears are formed around the first shield plate 59 and rotate in accordance with the rotation of the first gear 65. The second stepping motor 11d is the second
The rotating shaft 66 is rotated, the second gear 67 is attached to the second rotating shaft 66, and the second gear 67 rotates. Gears are also formed around the second shield plate 60, and rotate according to the rotation of the second gear 67.

FIG. 16 is an enlarged view of the shield plate.
16A shows a first shielding plate 59, and FIG. 16B shows a second shielding plate 60. As shown in FIG. 16, all the shield plates are circular, the first shield plate 59 has a notch 61 in the radial direction, and the second shield plate 60 has a spiral notch from the center to the periphery. It constitutes the part 62. By arranging these two shield plates vertically and combining them, an opening can be formed at an arbitrary position in the circle of the shield plate. That is, an arbitrary position in almost the entire region of the heating chamber 3 can be used as an opening to be a radiation position of electromagnetic waves, and local heating can be performed. Further, by rotating the two shield plates 59 and 60 in different cycles, the opening positions in the heating chamber 3 can be sequentially moved to achieve uniform heating.

At the beginning of heating, the control means 33 drives the two shield plates 59 and 60 in another cycle to perform uniform heating control, and the food 1 is detected from the temperature distribution detected by the temperature distribution detecting means 7.
Is extracted, the low temperature part is extracted from the food 1 and the two shield plates 5 are placed so that the opening is located under the low temperature part.
The angles of 9 and 60 are controlled to control local heating. By repeating this control, the low temperature part is removed from the food 1 and the whole is heated to a uniform temperature.

In this embodiment, two motors are used to drive the two shield plates, but it is also possible to change the gear ratio with one motor. In this case, the number of drive parts is small. It has the effect of improving reliability. Also, the shielding plate may move linearly instead of rotating,
The same effect can be obtained even if a large number of openings are provided and shielding plates are provided for the respective openings.

Further, in the above-mentioned first to fifth embodiments,
The heating chamber 3 is provided with an opening that serves as an electromagnetic wave radiation position of the distribution varying means.
This is because it is effective to radiate the electromagnetic waves into the heating chamber from as close to the food as possible in order to concentrate the electromagnetic waves on a part of the food and locally heat the food. However, the provision of the opening on the bottom surface of the heating chamber 3 does not limit the present invention and may be provided on the ceiling surface or the side surface. When it is installed on the ceiling surface, the effect is great if the food is moved in the height direction or the ceiling surface is moved in the height direction and the food and the ceiling surface are controlled close to each other. Since there is no plate or table between the department and food, more localized heating is possible. Further, when it is provided on the side surface, it becomes possible to locally control heating of a tall food in the height direction. Further, the distribution variable control may be performed by providing openings on two surfaces such as the bottom surface and the ceiling surface, or the bottom surface and the side surface, which is particularly effective for large foods.

In the above first to fifth embodiments,
The two-dimensional temperature distribution is detected by driving the one infrared detecting element by the temperature distribution detecting means, because this is cheap and the output of the infrared detecting element can be easily adjusted. However, driving one infrared detection element does not limit the present invention. For example, a plurality of infrared detection elements may be arranged two-dimensionally to detect the temperature distribution. In this case, there is no drive unit and there is an effect of improving reliability and an effect of instantaneously detecting temperature distribution. Further, for example, a plurality of infrared detecting elements may be linearly arranged to detect a linear temperature distribution, and a two-dimensional temperature distribution may be detected by combining it with rotation of a turntable. The same effect can be obtained even if a two-dimensional temperature distribution is detected by driving the element to swing it.

Next, a sixth embodiment of the present invention will be described with reference to FIGS.
8 will be described. FIG. 17 is a block diagram illustrating the control operation. FIG. 18 is a temperature characteristic diagram for explaining the operation of the contour extracting means. The same components as those in the first to fifth embodiments are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 17, in the initial stage of heating, the uniform heating control means 35 first controls the distribution varying means 11. If it is possible to distinguish whether or not food is present at each detection position detected by the temperature distribution detecting means 7, the heated object extracting means 34 controls the distribution varying means by the heating mode switching means 38 from the uniform heating control means 35 to local heating. It switches to the control means 39.

The object-to-be-heated extracting means 34 comprises a temperature change calculating means 36 and a contour extracting means 68. The temperature change calculation means 36 stores the temperature corresponding to each detection position of the temperature distribution detection means 7 at the beginning of heating and stores the temperature corresponding to each detection position after a lapse of a predetermined time from the initial temperature of the same detection position. The temperature difference ΔT is calculated. The contour extracting means 68 extracts the contour of the food by the temperature change ΔT from the initial stage corresponding to each detection position.

In FIG. 18A, the squares are the detection positions of the temperature distribution detecting means 7, and the shaded area is the food 1. Here, the temperature distribution detecting means 7 has a structure in which a plurality of infrared detecting elements are two-dimensionally arranged or linearly arranged, and the head is shaken to detect the temperature distribution at a detection position in a matrix. The temperature change from the beginning of the heating of the food 1 is usually larger than the temperature change of the part without food. The X-direction differentiating means 69 calculates the difference in temperature difference between the adjacent detection positions in the X-direction, that is, in the horizontal direction in FIG. 18, at the detection positions arranged in a matrix. The detected position whose calculation result is larger than a predetermined value is stored. The detection position indicated by hatching in FIG. 18B is a detection position larger than the predetermined value stored in the X-direction differentiating means 69.
Further, the Y-direction differentiating means 70 calculates the difference in temperature difference between the detection positions arranged in a matrix in the Y direction, that is, the adjacent detection positions in the vertical direction in FIG. The detected position whose calculation result is larger than a predetermined value is stored. The detection position indicated by hatching in FIG. 18C is a detection position larger than the predetermined value stored in the Y-direction differentiating means 70.

The shaping means 71 calculates the logical sum of the detected position stored by the X-direction differentiating means 69 and the detected position stored by the Y-direction differentiating means 70. That is, the X-direction differentiating means 69 or Y
The detected position stored by any of the direction differentiating means 70 is determined to be the contour of the food. Although there is a distribution even when the temperature of the food rises, there is a position where the difference in temperature between the adjacent detection positions is large even inside the food, but the shaping unit 71 defines the largest circumference as the contour of the food. In addition, if a part of the surrounding contour is cut, the contours are joined together. The object-to-be-heated extraction means 34 extracts the contour of the food as described above, and defines the inside surrounded by the contour as the food.

The low temperature part extraction means 40 extracts the low temperature part from the food extracted by the object to be heated extraction means 34, and the local heating control means 39 emits an electromagnetic wave to the low temperature part extracted by the low temperature part extraction means 40. The distribution varying means 11 is controlled so as to be emitted. In this way, the object to be heated is extracted and the electromagnetic waves are radiated thereto, so that it is possible to efficiently heat the object without wasting energy.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 19 is a block diagram for explaining the control operation of the high-frequency heating cooker according to the present invention. The same components as those in the first to sixth embodiments are designated by the same reference numerals and the description thereof will be omitted.

In the seventh embodiment, when it is desired to heat only a part of food, for example, when heating the Makunouchi bento, the food to be heated such as rice and the sashimi or pickled food should be eaten at a low temperature. Food is in one container. In this case, an explanation will be given as an example in which the rice is placed in the heating chamber as it is without heating the rice and the sashimi or pickles, and only the rice is heated.

In FIG. 19, a heating range setting means 72 is operated by the user to set the heating range. The heating range setting means 72 has a setting screen 73 made of liquid crystal,
It is composed of a cross-shaped cursor key 74, a setting key 75, and a cancel key 76.

The setting screen 73 is the bottom of the heating chamber, and the user sets the range to be heated in the bottom. When the user starts the setting, first the setting key 7
Press 5. At this time, the first point 7 is displayed in the upper left corner of the setting screen 73.
7 is displayed. Here, the user operates the cursor key 74 to move the first point 77 in the setting screen 73. The cursor keys 74 include an up key 74a, a down key 74b, a left key 74c, and a right key 74d.
The first point 77
Can be moved vertically and horizontally to any position. The user moves the first point 77 to the end of the heating range and presses the setting key 75. At this point, the position of the first point 77 is fixed and the second point 78 is displayed at the same position. Similarly, the user operates the cursor key 74 to move the second point 78. At this time, a rectangle 79 having a first point 77 and a second point 78 as diagonals is displayed on the setting screen 73. The range indicated by this rectangle is the heating range. The user moves the second point 78 to an arbitrary position on the setting screen 73 and sets the heating range with the rectangle 79. By pressing the setting key 75 again, the second point 78 and the rectangle 79 are fixed.
When there are a plurality of heating ranges, when the user presses the setting key 75 again, the first point 77 is displayed again on the setting screen 73, and the above operation is repeated. If you make a mistake, press the cancel key 76 to
The setting contents in 5 can be canceled.

When the heating range is set by the user's operation as described above, the control means 33 controls the heating range to be heated uniformly. The low temperature portion extracting means 40 extracts a low temperature portion from the heating range set by the heating range setting means 72 based on the signal from the temperature distribution detecting means 7. The local heating control means 39 controls the distribution varying means 11 so as to radiate electromagnetic waves to the low temperature portion extracted by the low temperature portion extracting means 40. As a result, the low temperature part disappears from the heating range, and the entire heating range can be heated uniformly. In addition, foods that should be eaten at low temperature can be cooked at low temperature without heating outside the heating range.

In the present embodiment, the description has been made on the case where different kinds of foods such as the Makunouchi bento enter the heating chamber at the same time, but even when heating only one product, if the heating range is set in this way, the food can be extracted in the early stage of heating. Since it is not necessary to do so, the structure of the control means can be simplified. Further, the heating range setting means 72 is set to the setting screen 73, the cursor key 74, the setting key 75, the cancel key 76.
However, the present invention is not limited to this, and there are methods such as using a touch panel and a mouse, which have the same effect. Although the operation is simplified by setting the heating range with a rectangle, the same effect can be obtained by setting with a free curve. In addition, if it is a product such as a box lunch in the curtain, if the heating range is encoded and printed on the packaging bag of the product by a barcode or the like, the heating range may be set by optically reading the print, In this case, there is an effect that the heating range can be set by an extremely simple operation even in a complicated heating range.

Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 20 is a block diagram for explaining the control operation of the high frequency heating cooker according to the present invention. For the sake of convenience, the same components as those in the first to seventh embodiments are designated by the same reference numerals,
Description is omitted.

The eighth embodiment is a case where it is desired to heat only a part of food as in the case of the seventh embodiment, and the bento will be heated at the store and provided to the customer for business use. Generally, there are a limited number of types of commercial products of such a form, and if the types are the same, the foods are placed in the same position in the container. For example, there are Makunouchi bento, yakiniku bento, salmon bento, etc. as the types of products, and if it is a yakiniku bento, the position of rice and the position of yakiniku are fixed. And although the types are limited, products of the same type are heated many times. In this case, for example, “1” is the Makunouchi lunch, “2” is the Yakiniku lunch,
“3” is a salmon bento, and if you register the heating range of each product in association with the code, you can call the heating range of the product selected by the customer with the code, simplifying the heating range setting operation. it can.

In FIG. 20, the heating means 72 has a group of numeric keys 80 from "1" to "10", a registration key 81 as a registration means, and a call key 82 as a registration call means.
To register the heating range, first, the heating range is set with the cursor key 74 and the setting key 75 by the operation method described in the seventh embodiment. Next, press the registration key 81 and press the numeric key group 8
Press one of the number keys 0. Then, when the setting key 75 is pressed, the heating range is stored in the registration storage means 83 together with the code pressed by the numeric keys. To call the heating range, first press the call key 82, and then press the number key corresponding to the product from the number key group 80. Registration storage means 8
The heating range stored in correspondence with the numerical code pressed from 3 is displayed on the setting screen 73. If there is no mistake, press the setting key 75 for confirmation. Once registered, only the calling operation is required after that, and the heating range can be set easily.

When heating is started, the control means 33 controls the distribution varying means 11 to heat the heating range to a uniform temperature as in the case of the seventh embodiment. That is, the low temperature part extraction means 40 extracts the low temperature part from the heating range set by the heating range setting means 72 based on the signal from the temperature distribution detection means 7, and the local heating control means 39 uses the low temperature part extraction means 40. The distribution varying means 11 is controlled so as to radiate the electromagnetic wave to the extracted low temperature portion.

In the present embodiment, the registration means and the registration calling means have been described with the numeral key group 80, the registration key 81 and the calling key 82, but this does not limit the present invention. It is also possible to display codes such as numbers, numbers, and alphabets and use the cursor keys 74 and the setting keys 75 as registration means and registration calling means. In this case, the number of keys is reduced and the configuration is simplified. effective. Further, it is possible to simplify the operation by printing the code on the packaging bag of the product and optically reading it without using the numeric key group.

[0101]

As is clear from the above description, the control means controls the distribution varying means based on the detection result of the physical quantity detecting means to optimize the electromagnetic wave distribution in the heating chamber, so that the deliciousness of food can be maximized. Can be cooked at the optimum temperature to bring out.

Further, since the object to be heated in the heating chamber is extracted by the object to be heated extracting means and the low temperature part in the object to be heated is extracted by the low temperature part extracting means to control the distribution varying means, wasteful heating is prevented. Without it, food can be heated appropriately and energy consumption can be reduced.

Further, since the low temperature part extraction means extracts the low temperature part from the heating range set by the heating range setting means and controls the distribution varying means, different kinds of foods having different optimum temperatures are simultaneously adjusted to the optimum temperatures. Can be cooked to heat.

Further, since the heating range is registered in the registration storage means by the registration means and is called by the registration calling means, the operation is simple and the usability for the user can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a high-frequency heating cooker according to a first embodiment of the present invention.

FIG. 2 (a) is a cross-sectional view of an essential part of an electromagnetic wave radiation part when electromagnetic radiation of the high-frequency heating cooker is directed toward the center of the cooker. (B) Electromagnetic radiation of the high-frequency heating cooker cooks. Cross-sectional view of the main part of the electromagnetic wave radiation part when it is performed toward the periphery of the vessel

FIG. 3 is a sectional view of a main part of a physical quantity detection means of the high-frequency heating cooker.

FIG. 4 is a characteristic diagram showing a detection area of a physical quantity detection means of the high-frequency heating cooker.

FIG. 5 is a block diagram illustrating a control operation of the high-frequency heating cooker.

FIG. 6 is a characteristic diagram showing a temperature change characteristic of the high-frequency heating cooker.

FIG. 7 is a block diagram illustrating a control operation of the high-frequency heating cooker according to another method.

FIG. 8 is a block diagram illustrating a control operation of the high-frequency heating cooker according to the second embodiment of the present invention.

FIG. 9 is a sectional view showing the structure of a high-frequency heating cooker according to a third embodiment of the present invention.

FIG. 10 is a sectional view of an essential part of an electromagnetic wave radiating part of the high-frequency heating cooker.

FIG. 11 is a characteristic diagram illustrating a heating region of the high-frequency heating cooker.

FIG. 12 is a cross-sectional view of a main part of temperature distribution detection means of the high-frequency heating cooker.

FIG. 13 is a sectional view showing the configuration of a high-frequency heating cooker according to a fourth embodiment of the present invention.

FIG. 14 (a) is a cross-sectional view of an essential part of an electromagnetic wave radiation part when the electromagnetic radiation of the high frequency heating cooker is directed toward the periphery of the cooker. (B) The electromagnetic radiation of the high frequency heating cooker cooks. Sectional view of the main part of the electromagnetic wave emission part when it is performed toward the center of the vessel

FIG. 15 is a sectional view showing the configuration of a high-frequency heating cooker according to a fifth embodiment of the present invention.

16 (a) is an enlarged view of a first shielding plate of the same high-frequency heating cooker, and (b) is an enlarged view of a second shielding plate of the same high-frequency heating cooker.

FIG. 17 is a block diagram illustrating a control operation of a high frequency heating cooker according to a sixth embodiment of the present invention.

FIG. 18 (a) is a diagram showing the position of food in the high-frequency heating cooker; (b) is a lateral profile diagram of food extracted by the contour extracting means of the high-frequency heating cooker; and (c) is food extracted by the contour extracting means. Vertical contour map (d) Food contour map obtained by synthesizing horizontal and vertical contours extracted by the contour extracting means

FIG. 19 is a block diagram illustrating a control operation of a high frequency heating cooker according to a seventh embodiment of the present invention.

FIG. 20 is a block diagram illustrating a control operation of a high frequency heating cooker according to an eighth embodiment of the present invention.

FIG. 21 is a sectional view showing the configuration of a conventional high-frequency heating cooker.

[Explanation of symbols]

 3 heating chamber 4 high frequency generating means 5 waveguide 7 physical quantity detecting means (temperature distribution detecting means) 11 distribution varying means 11a waveguide moving means 11b, 11c, 11d opening position varying means 13 mounting table 14 rotating means 19 infrared temperature detection Device 22 drive means 33 control means 34 heated object extraction means 35 uniform heating control means 36 temperature change calculation means 37 temperature change comparison means 38 heating mode switching means 39 local heating control means 40 low temperature partial extraction means 41 menu setting means 42 control mode Selection means 43 Heating mode switching control means 44 Heating mode non-switching control means 68 Contour extraction means 72 Heating range setting means 81 Registration means 82 Registration calling means 83 Registration storage means

Claims (15)

[Claims] 1. A heating chamber for accommodating an object to be heated, a high frequency generator for heating the object to be heated, a physical quantity detecting means for detecting a physical quantity of the object to be heated, and an electromagnetic wave distribution in the heating chamber. A high-frequency heating cooker comprising distribution varying means and control means for controlling the distribution varying means according to the physical quantity detected by the physical quantity detecting means. 2. The high frequency heating cooker according to claim 1, wherein the physical quantity detecting means is constituted by temperature distribution detecting means for detecting the temperature distribution of the object to be heated. 3. The control means comprises a uniform heating control means for evenly distributing the electromagnetic waves in the heating chamber by the distribution varying means, a local heating control means for concentrating the electromagnetic waves on a part, and the uniform heating during heating of the object to be heated. 3. A heating mode switching means for switching between the heating control means and the local heating control means.
The high-frequency heating cooker described. 4. A uniform heating control means for allowing a user to set a cooking menu, wherein the control means uniformly distributes electromagnetic waves in the heating chamber by the distribution varying means,
Local heating control means for concentrating electromagnetic waves on a part, heating mode switching control means constituted by heating mode switching means for switching between the uniform heating control means and the local heating control means during heating of the object to be heated, and heating start initial stage From the heating mode non-switching control means for controlling the distribution varying means by the local heating control means, and the control mode selection for selecting the heating mode switching control means and the heating mode non-switching control means by the setting menu of the menu setting means The high frequency heating cooker according to claim 2, further comprising means. 5. The high frequency heating according to claim 1, wherein the distribution varying means includes a waveguide for introducing an electromagnetic wave having an opening in the heating chamber and a waveguide moving means for moving the waveguide. Cooking device. 6. A placing table for placing an object to be heated in the heating chamber,
6. The high-frequency heating cooker according to claim 5, wherein a rotating means for rotating the mounting table is provided, and the opening of the waveguide is movable in a range from the vicinity of the rotation center of the mounting table to the periphery. 7. The high frequency heating cooker according to claim 1, wherein the distribution varying means has an opening for introducing an electromagnetic wave into the heating chamber and has an opening position varying means for changing the position of the opening. 8. A placing table for placing an object to be heated in the heating chamber,
The high-frequency heating cooker according to claim 7, wherein a rotating means for rotating the mounting table is provided, and the variable range of the opening is set to a position extending from the vicinity of the center of rotation of the mounting table to the periphery thereof. 9. The high frequency heating cooker according to claim 5, wherein the opening is provided on the bottom surface of the heating chamber. 10. The heating chamber is provided with a mounting table on which an object to be heated is mounted and a rotating means for rotating the mounting table, and the temperature distribution detecting means is an infrared temperature detector and a detection point of the infrared temperature detector. 3. The high-frequency heating cooker according to claim 2, further comprising a driving unit that reciprocates in the radial direction of rotation of the mounting table, and the rotation period of the rotating unit is an integral multiple of the reciprocating period of the driving unit. 11. The control means includes a heated object extracting means for extracting a heated object portion from the temperature distribution detecting means, and a low temperature partial extraction for extracting a low temperature portion from the heated object portion extracted by the heated object extracting means. The high frequency heating cooker according to any one of claims 2 to 4, wherein the local heating control means controls the distribution varying means based on the means and the extraction result of the low temperature partial extraction means. 12. The object-to-be-extracted means compares the temperature change calculation means for calculating a temperature change from the beginning of heating of each detection portion of the temperature distribution detection means with a calculation result of the temperature change calculation means with a predetermined value. 12. The high-frequency heating cooker according to claim 11, further comprising: a temperature change comparison means, wherein a detection point at which a calculation result of the temperature change calculation means is larger than a predetermined value based on a comparison result of the comparison means is an object to be heated. 13. The object-to-be-extracted extracting means is a temperature change calculating means for calculating a temperature change of each detecting portion of the temperature distribution detecting means from an initial heating start point, and an adjacent detecting location of a calculation result of the temperature change calculating means. The high-frequency heating cooker according to claim 11, further comprising a contour extracting means for calculating a difference between the contour and the contour of the object to be heated. 14. A low-temperature part extracting means for extracting a low-temperature part in the heating range set by the heating range setting means, and a low-temperature part, wherein the user has a heating range setting means for setting a heating range. The high frequency heating cooker according to claim 2, further comprising local heating control means for controlling the distribution varying means based on the extraction result of the extraction means. 15. The heating range setting means includes a registration means for registering the heating range set by the user together with a registration code, a registration storage means for storing the heating range registered by the registration means together with the registration code, and a user. 15. The high-frequency heating cooker according to claim 14, further comprising registration calling means for calling the corresponding heating range by the registration code.