JPH07269881A - Microwave oven - Google Patents

Abstract

PURPOSE:To obtain a plurality of heating modes for foodstuffs to be cooked and prevent a spark in a waveguide from occurring and an impedance from being varied. CONSTITUTION:An opening 18 is formed in a back plate which is a wall of a heating chamber 4, and a disc 23 which is driven for rotation by a motor for the disc is disposed in the opening 18. An opening 23a is formed in the disc 23 and is selectively located in an upper position or in a lower position by driving the disc 23 for rotation. A microwave from a magnetron 29 passes through a waveguide 28 and a cavity box 19 and is radiated into the heating chamber 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven having an improved microwave power supply structure for a heating chamber.

[0002]

2. Description of the Related Art In a microwave oven, an opening is formed in a wall of a heating chamber, and microwaves from a magnetron are supplied from the opening into the heating chamber through a waveguide, and the microwave is stored in the heating chamber. Dielectric heating of food. Therefore,
As a power feeding structure for supplying microwaves into the heating chamber, there have been conventionally known Japanese Patent Publication Nos. Sho 64-9718 and Hei 5-1.
There is one disclosed in Japanese Patent No. 44566.

In the first conventional example disclosed in Japanese Patent Publication No. 64-9718, two openings are provided in the same side wall of the heating chamber, and the microwave from the magnetron is passed through the waveguide and the two openings. It is a structure in which it is supplied from the opening into the heating chamber. In the second conventional example disclosed in Japanese Patent Laid-Open No. 5-144566, a plurality of openings are provided in the ceiling wall of the heating chamber, and a waveguide is provided so as to cover the plurality of openings from the outside. , Furthermore, provided with a switching mechanism for switching the plurality of openings,
The microwave from the magnetron is supplied into the heating chamber through the opening switched through the waveguide.

[0004]

In the configuration of the first conventional example, since microwaves are supplied from the upper and lower openings into the heating chamber, uniform heating of cooked food can be expected for the time being. There is only one, so the type of cooked food,
Optimal heating cannot be performed according to the food condition such as shape and weight. Further, in the configuration of the second conventional example, since the opening for supplying microwaves is switched, it is possible to expect optimal heating according to the type, shape, weight, etc. of the cooked food, since there are multiple heating modes. Since a part of the electric field is located in the high electric field in the waveguide, a spark is generated, the change in impedance is not so large, stable oscillation cannot be performed, and the cookability of the cooked food is deteriorated.

The present invention has been made in view of the above circumstances, and a first object thereof is to obtain a plurality of heating modes, depending on the food condition such as the type, shape and weight of cooked food. An object is to provide a microwave oven capable of performing optimum heating.

A second object of the present invention is to achieve stable oscillation without causing sparks or changing impedance in the waveguide while achieving the first object. To provide a microwave.

[0007]

A microwave oven according to claim 1 comprises a heating chamber, a magnetron for supplying microwaves to the heating chamber, and a substantial part of a wall of the heating chamber. And a movable body having an opening for radiating the microwave from the magnetron into the heating chamber, a drive means for driving the movable body, and the movable body by controlling the drive means. It is characterized in that it comprises a control means for moving the cooked food according to the food.

The microwave oven according to claim 2 includes a heating chamber,
A cavity provided outside the chamber wall of the heating chamber, a waveguide provided in communication with the cavity, a magnetron for supplying microwaves to the waveguide, and the heating in the cavity. A movable body which is movably provided so as to substantially form a part of a chamber wall, and has an opening for radiating the microwave supplied from the waveguide into the cavity into the heating chamber; It is characterized in that it comprises a driving means for driving the moving body, and a control means for controlling the driving means to move the moving body according to the cooked food.

A microwave oven according to a third aspect of the present invention includes a moving body,
It is characterized in that it is configured to rotate. The microwave oven according to claim 4 is characterized in that a choke portion is formed between the moving body and the chamber wall of the heating chamber. The microwave oven according to a fifth aspect is characterized in that the choke portion is constituted by a rising portion formed on the moving body and the chamber wall of the heating chamber.

A microwave oven according to a sixth aspect of the present invention includes a food selection key for selecting cooked food, and the control means controls the drive means in response to the operation of the food selection key to determine the moving position of the moving body. It is characterized in that it is configured as described above.

A microwave oven according to a seventh aspect of the present invention includes a moving body
The opening is configured to move upward and downward, and the control means selectively executes an upper position mode in which the moving body stops upward and a lower position mode in which the moving body stops at the lower position. It is characterized in that it is configured to be moved to.

The microwave oven according to claim 8 is characterized in that the magnetron is controlled to intermittently oscillate, and the control means is configured to move the moving body while the oscillation of the magnetron is stopped. Have.

The microwave oven according to claim 9 is characterized in that the control means is configured to move the moving body during the heating operation by the magnetron. Claim 1
The microwave oven described in 0 is characterized by including a gas sensor that detects gas in the heating chamber, and configuring the control means to move the moving body according to the detection result of the gas sensor.

The microwave oven according to claim 11 comprises a weight sensor for detecting the weight of the cooked food stored in the heating chamber, and the control means determines the moving position of the moving body in accordance with the detection result of the weight sensor. It is characterized in that it is configured to do.

According to a twelfth aspect of the present invention, in the microwave oven, the control means is arranged so that, when the thaw is thawed, the opening of the moving body is alternately raised.
It is characterized in that it is configured to control so as to move it to the lower position.

[0016]

According to the microwave oven of the first aspect, since the opening can be moved together with the moving body, a plurality of heating modes can be obtained. According to the microwave oven of the second aspect, since the microwave from the magnetron is supplied to the cavity through the waveguide and then radiated into the heating chamber from the opening of the moving body, the driving means for driving the moving body is provided. Even if there is a spark, a stable oscillation can be performed without generating a spark or changing an impedance.

According to the microwave oven of the third aspect, since the moving body is configured to make a rotary motion, the cavity portion can be made thinner than in the case where a plurality of openings are opened and closed by the valve body. You can

According to the microwave oven of the fourth aspect, in the choke portion between the moving body and the chamber wall of the heating chamber, microwave leaks into the heating chamber from between the moving body and the chamber wall of the heating chamber. Therefore, the microwave is supplied into the heating chamber only from the opening, and therefore the heating mode depending on the opening position is surely executed.

According to the microwave oven of the present invention, since the choke portion is constituted by the rising portion formed between the moving body and the chamber wall of the heating chamber, the moving body wraps with the chamber wall, for example. Assembling is improved as compared with the case of the configuration.

According to the microwave oven of the sixth aspect, since the control means moves the moving body in response to the operation of the food selection key, the optimum heating mode for the cooked food can be obtained only by operating the food selection key. It is automatically selected.

According to the microwave oven of the seventh aspect, by moving the moving body, it is possible to switch between the case where the microwave is emitted from the upper side and the case where the main microwave is emitted from the lower side.

According to the eighth aspect of the present invention, since the control means moves the moving body while the magnetron oscillation operation is stopped, the moving operation of the moving body does not adversely affect the magnetron oscillation operation.

According to the microwave oven of the ninth aspect, since the control means moves the moving body during the heating operation by the magnetron, the heating mode can be switched during the heating operation.

According to the microwave oven of the tenth aspect, the control means moves the moving body in the middle of the heating operation according to the detection result of the gas sensor, so that the heating mode can be switched to the optimum timing.

[0025] According to the microwave oven of the eleventh aspect, the control means comprises the moving position of the moving body in accordance with the weight of the cooked food,
That is, since the opening position is determined, the optimum heating mode according to the weight of the cooked food is executed.

According to the microwave oven of the twelfth aspect, the control means moves the moving body so that the opening thereof is alternately located at the upper and lower positions during the raw thawing, so that the frozen food for sausage of cooked food is frozen. Food can be thawed uniformly.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, referring to FIGS. 1 and 2, a main body 1 includes an inner box 3 having an open front surface inside an outer box 2 having an open front surface.
The inner box 3 has a heating chamber 4 which is opened and closed by a door 5. On the right side of the front surface of the main body 1, the operation panel 6
The operation panel 6 is provided with a large number of food selection keys 7, a plurality of function keys 8 and a display section 9.

At the bottom of the heating chamber 4, the turntable 1
0 is arranged, and the turntable 10 includes a drive mechanism 1 including a turntable motor 11 (see FIG. 6).
It is rotated by 2 and can be received by a weight sensor 13 provided integrally with the drive mechanism 12. Further, in the heating chamber 4, a temperature sensor 14 composed of a thermistor is arranged. A gas sensor 16 and an interior lamp 17 are provided in the exhaust passage 15 communicating with the heating chamber 4.

3 to 5, a circular opening 18 is formed in the back plate 3a of the inner box 3 which is the chamber wall of the heating chamber 4, and a peripheral edge of the opening 18 is formed. A step portion 3b that bulges rearward and a rising portion 3c that protrudes rearward are formed subsequently to this. Also, the back plate 3a of the inner box 3
Is a rectangular hollow box 19 whose front surface is open as a hollow portion.
Are attached so as to cover the opening 18 from the outside. Further, the back frame 19a of the hollow box 19 has a mounting frame 2
0 is mounted on the mounting frame 20. A disk motor 21 composed of a synchronous motor with a speed reducer as driving means is mounted on the mounting frame 20.
Is attached and fixed. A drive shaft 22 is inserted into and supported by a back plate 19a of the hollow box 19, a base end portion of the hollow box 19 is connected to a rotary shaft 21a of a disc motor 21, and a disc 23 as a moving body is provided at a tip end portion. The openings 18 are connected so as to face each other. In this case, the hollow box 19 and the disc 2
3 is formed of a material that reflects microwaves. Further, the circular plate 23 is formed with one rectangular opening 23a.

A rising portion 23b is formed on the peripheral edge of the disc 23 so as to project rearward, and the rising portion 23b faces the rising portion 3c of the inner box 3 with a predetermined gap. Thus, the choke portion 24 is constituted by both of them. On the other hand, a rotation control cam 25 is mounted and fixed to the drive shaft 22 in the mounting frame 20, and
On the back plate 19a of the hollow box 19, position detecting microswitches 26 and 27 which are also located around the control cam 25 and also serve as stoppers are arranged. In this case, when the disk motor 21 is rotated in one direction to rotate the disk 23 via the drive shaft 22 and the opening 23a reaches the lower position, the rotation control cam 25 detects the position. The microphone switch 26 is brought into contact with the microphone switch 26 and stopped, and the microphone switch 26 is turned off. Further, when the disk motor 21 is rotated in the opposite direction, the disk 23 is moved through the drive shaft 22. When the opening 23a is rotated and reaches the upper position, the rotation control cam 25 comes into contact with the position detecting micro switch 27 to be stopped and the micro switch 27 is turned off.

Then, the waveguide 2 is provided on the back plate 3a of the inner box 3.
8 is provided, a magnetron 29 is provided at one end of the waveguide 28, and an antenna 29 a thereof is provided so as to project into the waveguide 28. Also, the waveguide 2
The other end of 8 is connected to the side wall of the hollow box 19 so that the inside of the waveguide 28 communicates with the inside of the hollow box 19. A protective plate 30 made of glass is arranged in the opening 18 of the back plate 3a of the inner box 3.
Is attached to the stepped portion 3b, and a sealing material 31 having heat resistance is applied to the periphery thereof. This protective plate 30
Are provided as needed, and therefore the disk 23 located at the opening 18 substantially forms a part of the chamber wall of the heating chamber 4.

Next, the electrical construction will be described with reference to FIG. The power plug 32 is to be plugged in and connected to an outlet, not shown, which is a 100-volt single-phase AC power supply, and one terminal thereof has a power line 36 through a current fuse 33, a thermo switch 34, and a door switch 35 in series.
, And the other terminal is connected to the power supply line 38 via the door switch 37. Then, the power supply lines 36, 38
A chute switch 39 is connected between them. In this case, the door switches 35 and 37 are adapted to be turned off and on in association with the opening and closing of the door 5, respectively, and the short switch 39 is turned on and off in the reverse relationship of the door switches 35 and 37. It is like this. Further, the thermoswitch 34 detects the temperature of the magnetron 29,
It turns off when this exceeds the set temperature. The power supply line 38 is connected to the power supply line 41 via a relay switch 40 of a main relay described later.

The constant voltage DC power supply circuit 42 has both input terminals connected between the common connection point of the thermal switch 34 and the door switch 35 and the terminal of the power plug 32 on the door switch 37 side. The single-phase AC power supply supplied from the device is stepped down, rectified, smoothed, and made into a constant voltage to obtain a constant-voltage DC power supply, the output terminal of which is connected to the power supply port of the control device 43 as the control means. There is.

The control device 43 is mainly composed of a microcomputer and operates as will be described later.
Main relay (having main relay switch 40), fan motor relay (having fan motor relay switch 44), upper heater relay (having upper heater relay switch 45), lower heater relay. (Has a lower heater relay switch 46.), disk relay (changeover switch type disk relay switch 47)
Have. ) And a magnetron relay (having a magnetron relay switch 48). In the control device 43, the weight sensor 13, the temperature sensor 14, the gas sensor 16, the food selection key 7 and the function key 8 are connected to the input port, and the display unit 9 is connected to the output port. .

The internal light 17 and the turntable motor 11 are connected between the power lines 36 and 41, and
Fan motor relay switch 44 and fan motor 4
9 series circuits are connected. In this case, the fan motor 49 drives a fan that cools the magnetron 29. Further, a series circuit of an upper heater relay switch 45 and an upper heater 50 and a series circuit of a lower heater relay switch 46 and a lower heater 51 are connected between the power supply lines 36 and 41. In this case, although not shown in FIGS. 1 and 2, the upper heater 50 and the lower heater 51 are arranged above and below the heating chamber 4.

Thus, in the disc switch relay switch 47 of the changeover switch type, the movable contact piece c is connected to the power source line 36, and the fixed contact pieces b and a are the position detecting micro switch 2.
They are commonly connected via 6 and 27, and the common connection point is connected to the power supply line 41 via the disk motor 21.

The primary coil 52a of the high voltage transformer (step-up transformer) 52 is connected between the power supply lines 36 and 41 via a magnetron relay switch 48 in series. Further, a series circuit of a diode 53 and a capacitor 54 is connected between both terminals of the secondary coil 52b of the high voltage transformer 52, and the cathode of the diode 53 is connected to the cathode of the magnetron 29 and is grounded. The anode of the diode 53 is connected to one terminal of the anode of the magnetron 29 via the diode 55. And both terminals of the anode of the magnetron 29 are
It is connected to both terminals of the secondary coil 52c of the high voltage transformer 52. Here, the diodes 53 and 55 and the capacitor 54 form a voltage doubler rectifier circuit 56.

Next, the operation of this embodiment will be described with reference to FIGS. 7 and 8 show the results of experiments conducted by the present inventor. That is, FIG. 7 and FIG.
(A) and (b) of FIG.
7 is set, five cups 58 filled with water are placed on the upper surface of the turntable 10, and the cups 58 are placed on the central part and four positions on the outer peripheral side that are equally spaced from the central part, and the turntable 10 is rotated. However, when the microwave from the magnetron 29 is supplied to the heating chamber from the opening 23a of the disk 23, the cup 58
It shows the result of measuring the average temperature of the water inside, and each number is the measured temperature. Here, (a) of FIG. 8 shows the case where the opening 23a of the disc 23 is set to the lower position, and (b) of FIG. 8 shows the case where the opening 23a of the disc 23 is set to the upper position. 8) is a case where the disc 23 is intermittently reciprocally rotated to alternately position the openings 23a at the upper position and the lower position.

As is clear from this measurement result, when the opening 23a is at the lower position as shown in FIG.
When the peripheral portion is higher than the central portion and the opening 23a is at the upper position as shown in FIG. 8B, the central portion is higher than the peripheral portion, and as shown in FIG. In the case where the openings 23a alternate between the upper position and the lower position, the center portion and the periphery are substantially equal. Then, the temperature distribution rate T = (MIN / MAX) × indicated by the percentage of the maximum value (MAX) of one of the central portion and the peripheral portion and the minimum value (MIN) of the other.
When 100 (%) is obtained, T is 100 (%) when there is no temperature difference between the central portion and the peripheral portion. 8 (a)
In case of, MAX = 27 (° C.) and MIN = 23
Since it is (° C.), T becomes about 85 (%), and in the case of (b) of FIG. 8, MAX = 28 (° C.) and MIN = 2.
Since it is 5 (° C), T becomes about 89 (%), and
In the case of (c) of FIG. 8, MAX = 27 (° C.) and MI
Since N = 25 (° C.), T becomes about 93 (%).

Looking at this temperature distribution ratio, in the case of FIG. 8A, there is no temperature difference between the central portion and the peripheral portion.
In the case of (b) of FIG. 8, the distribution in which the central portion is lower in temperature than the peripheral portion by 15 (%) than in the (%) state is 11 (%) than in the 100 (%) state. Shows the distribution in which the temperature is higher in the central part than in the peripheral part.
In the case of, it can be seen that the distribution in the direction in which the central portion is higher in temperature than the peripheral portion by 7 (%) than in the state of 100 (%).

FIG. 8 (c) shows the measurement result when fifteen frozen shoe mai 59 are placed on the rotary dish 57 and heated in the same condition as in the case of the above-mentioned cup 58. When the opening 23a is at the lower position as shown in FIG. 8B, the temperature difference between the maximum temperature and the minimum temperature is 5
6 (° C.), and when the opening 23a is at the upper position as shown in (b) of FIG. 8, the temperature difference between the maximum temperature and the minimum temperature is 20 (° C.). When the openings 23a alternate between the upper position and the lower position as shown in (c) of FIG. 8, the temperature difference between the maximum temperature and the minimum temperature is 43.
(° C).

FIG. 8 (d) shows the results of measuring the difference between the upper and lower temperatures when the milk (200 cc) in the cup 60 and the sake (180 cc) in the sake bottle 61 were heated in the same situation. In addition, the measurement points of the cup 60 and the bottle 61 are indicated by "x". When the opening 23a is at the lower position as shown in (a) of FIG. 8, the vertical temperature difference of milk is 6 (° C.) and the vertical temperature difference of sake is (4 ° C.). When the opening 23a is in the upper position, the temperature difference between the upper and lower milk is 1
The temperature difference between the upper and lower sides of the sake is 3 (° C.) and 21 (° C.), and when the opening 23 a is alternated between the upper position and the lower position as shown in (c) of FIG. The temperature difference between the top and bottom of sake is 13 (° C).

Further, FIG. 8 (e) shows the result of measuring the temperature distribution when the frozen tuna block for sashimi was subjected to raw thawing in the same situation. When the opening 23a is at the lower position as shown in FIG. 8A, the central portion is 2 (° C.), while the four corner portions are 5 (° C.), −2 (° C.), −1.
(° C.) and −1 (° C.), and when the opening 23 a is at the upper position as shown in (b) of FIG. 8, the central portion is 13 (° C.), while the four corners are −1 (° C.). ), 1 (° C), -2
(° C.) and 2 (° C.), and when the opening 23 a alternates between the upper position and the lower position as in (c) of FIG. 8, the central portion is −1 (° C.), while the four corner portions are Is -1 (° C),-
2 (° C), -1 (° C) and -1 (° C).

Based on the above experimental results, in this embodiment,
The following control is performed. (1) First control example (see FIG. 9) First, basic control of the control device 43 will be described with reference to FIG. Turntable 57 of the turntable 10
The cooked food is placed on the door and the door 5 is closed (the door switches 35 and 37 are turned on and the short switch 39 is turned off), the cooked food is selected by the food selection key 7, and the start key of the function keys 8 is pressed. When operated, the controller 43
First, the main relay switch 40 and the fan motor relay switch 44 are turned on. Therefore, when the main relay switch 40 is turned on, the turntable motor 11 and the interior lamp 17 are energized, and the main relay switch 40 and the fan motor relay switch 4 are also turned on.
When the switch 4 is turned on, the fan motor 49 is energized (time t0).

When the fan motor 49 is energized and rotates, the fan is driven, the fan blows air into the heating chamber 4 through the magnetron 29, and the air in the heating chamber 4 flows through the exhaust passage 15. After that, the residual gas in the heating chamber 4 is also discharged by this exhaust, and the refresh operation in the heating chamber 4 is performed. Then, the gas sensor 16 comes to detect the gas contained in the air in the heating chamber 4 flowing through the exhaust passage 17, and the gas sensor 1
The output (voltage) VS of 6 increases as the detected gas amount decreases, as shown in FIG.

The control device 43 turns on the magnetron relay switch 48 after performing the above-described refresh operation for a predetermined time (for example, 16 to 20 seconds), and the magnetron 29 causes the voltage doubler rectifier circuit to operate. 5
The output voltage from 6 is applied between the cathode and the anode to oscillate, and the microwave is guided from the antenna 29a to the waveguide 2
It comes to radiate in 8. Then, the microwave radiated into the waveguide 28 passes through the inside of the waveguide 28 and the hollow box 19
After being supplied to the inside of the hollow box 19 and being reflected between the inner surface of the hollow box 19 and the disk 23, it is radiated from the opening 23a of the disk 23 into the heating chamber 4, and thus the dielectric of the cooked food on the rotating plate 57 is reduced. Heating is performed (time t1).

On the other hand, the control device 43 constantly samples the output (voltage) VS of the gas sensor 16 to determine its maximum value V.
Smax is sequentially updated and stored. After that, when the gas sensor 16 detects the gas generated from the cooked food and the output VS starts to decrease (time t2), the control device 43 activates the timer and sets the maximum value VS.
The target value (α ·
VSmax) is calculated. Then, when the output VS of the gas sensor 16 decreases by the target value (α · VSmax) (time t3), the control device 43 causes the timer to finish the time counting operation, and the remaining cooking time of the cooked food from the time T1 of the timer. The time T2 is calculated. Therefore, from time t1 to time t
The cooking time T0 up to 3 varies depending on the type and weight of the cooked food.

After that, when the calculated remaining cooking time T2 has elapsed (time t5), the controller 43 turns off all the main relay switch 40, magnetron relay switch 48 and other relay switches. , The food cooking operation is completed.

Based on such a basic cooking operation, control corresponding to various cooked foods will be described below. (A) Rice Here, the opening 23a of the disc 23 is at the lower position,
It is assumed that the cam 25 contacts the position detecting micro switch 26 to turn on the micro switch 26.

The control device 43 operates as described above when the "food" food selection key of the food selection keys 7 is pressed at the start of cooking and then the start key of the function keys 8 is pressed. In addition to performing such basic operation, the contact piece (c-
b) Turn on the connection. As a result, as described above, when the opening 23a of the disc 23 is at the upper position, the cam 2
Since 5 contacts the position detecting micro switch 26 to turn off the micro switch 26, the disc motor 21 is not energized, and the disc 23 stops in a state where the opening 23a is in the upper position. ing. Therefore, in this state, the microwave from the magnetron 29 comes to be radiated from the upper side into the heating chamber 4 through the opening 23a at the upper position of the disc 23, and the rice laid on the bowl serving as the cooked food, The central part is heated so as to have a higher temperature than the peripheral part.

In such a state, the control device 43
At time t3, the remaining cooking time T2 is calculated on the basis of the time count T1 of the timer. In this case, the remaining cooking time T2 is half the respective time T3 and T4 (T3 = T4). Divide into. Then, the control device 43
At time t3, the contact point (c-a) of the disk relay switch 47 is turned on, so that the disk motor 21 contacts the contact point (c-a) of the disk relay switch 47.
The electric power is supplied between the a) and the position detecting microswitch 27. In this case, since the cam 25 contacts the microswitch 26 and the rotation in one direction is restricted in the disk motor 21 that is a synchronous motor, the disk motor 21 is rotated in the opposite direction by energization, and the disk 23 is rotated. Is rotated in the timing direction so that the opening 23a moves from the upper position toward the lower position.

After that, when the disc 23 is rotated until the opening 23a is located at the lower position, the cam 25 contacts the position detecting micro switch 27 and turns off the microphone switch 27, so that the disc motor 21 is driven. Is cut off and stopped, and the disk 23 stops with its opening 23a in the lower position. Therefore, the microwave from the magnetron 29 is radiated into the heating chamber 4 through the opening 23a located below the disc 23, and this time, cooked food tart rice is
Heating is performed so that the temperature of the peripheral portion is higher than that of the central portion.

Further, when time T3 elapses (time t
4), the controller 43 alternately turns on between the contact pieces (c-b) and between the contact pieces (c-a) of the disk relay switch 47, whereby the disk 23 opens. 23a is rotated counterclockwise and clockwise so as to alternate between the upper position and the lower position, and the microphone wave from the magnetron 29 is introduced into the heating chamber 4 from the upper opening 23a and the lower opening 23a. Are alternately radiated, and cooked food tart rice is heated so that both the central portion and the peripheral portion have a uniform temperature. After that, the control device 43 determines that the time T
When 4 has elapsed, all the relay switches are turned off to end the operation.

(B) Side dish In this case, the food selection key of "side dish" of the food selection keys 7 is pressed. Then, the control device 43
At the start of cooking, set the opening 23a of the disc 23 to the upper position,
After time t3, the opening 23a of the disk 23 is set to the lower position, and the side dish placed on the plate is heated by the microwave from the magnetron 29. In this case, since the bowl is used for the above-mentioned rice and the plate is used for the side dish, the height of the bowl, which is the container, is larger than that of the bowl when the bowl uses the bowl, so the control device 43
Is the time T4 so that the temperature difference between the upper and lower sides is eliminated as much as possible
Then, the disc 23 is controlled so that the openings 23a thereof alternate between the upper position and the lower position.

(C) Milk, sake canned In this case, the food selection key "milk" or "liquor can" of the food selection keys 7 is pressed. And
The control device 43 controls the disc 23 so that the opening 23a is at the lower position from the start of cooking to the end of cooking. This is to heat milk contained in a cup having a large height or sake contained in sake bottles with as little temperature difference as possible.

(D) Raw thawing In this case, the "raw thawing" food selection key of the food selection keys 7 is pressed. Then, the control device 43
The magnetron relay switch 48 is turned on and off to control the magnetron 29 so as to repeat the oscillation operation for 15 seconds and the oscillation stop for 7 seconds. Further, the control device 43
Opens the disc 23 from the start to the end of cooking
It is controlled so that a alternates between the upper position and the lower position. In this case, the control device 43 rotates the disc 23 with the time of 4 seconds so that the opening 23a is in the upper position or the lower position during 7 seconds after the oscillation of the magnetron 29 is stopped, and within 18 seconds. The opening 23a is controlled so as to be stopped at the upper position or the lower position.

The intermittent operation of the magnetron 29 is for lowering the heating output at the time of raw thawing. Further, the rotation of the disk 23 when the oscillation of the magnetron 29 is stopped is caused by the rotation of the disk 23. This is because it does not adversely affect the oscillation operation of.

(E) Boiled leafy vegetables In the case of boiled leafy vegetables such as spinach and leek, the food selection key of "leafy vegetables" in the food selection keys 7 is pressed. Then, the control device 43 controls the disc 23 such that the openings 23a thereof alternate between the upper position and the lower position between the start of cooking and the time t3, and the disc 23 is controlled until the end of cooking after the time t3. The opening 23a is controlled so as to be in the lower position. This is because leaf vegetables are generally placed on a plate so that the central part becomes a mountain, so the central part and the peripheral part are heated almost evenly in the first half of the cooking and the central part in the latter half of the cooking. This is because of the higher heating.

(F) Boiled root vegetables In the case of root vegetables such as potatoes, radish and carrots,
The food selection key of "root vegetables" among the food selection keys 7 is selected and pressed. Then, the control device 43 controls the disc 23 so that the opening 23a is at the upper position from the start of cooking to time t3, and until the end of cooking after time t3.
The disc 23 is controlled so that its openings 23a alternate between an upper position and a lower position. This is because root vegetables tend not to be heated in the center.

(2) Second control example (see FIG. 10) The control device 43 controls the position of the opening 23a of the disk 23 depending on the type of cooked food, and detects the weight detected by the weight sensor 13 (the weight of the container is The following control is also performed.

(A) Rice, side dish When the cooked food is rice or side dish, the control device 43 sets a small amount (eg less than 350 g or 50).
When it is less than 0 g), the disc 23 is controlled so that the opening 23a is at the upper position. Further, the control device 43 controls the amount of rice or side dishes to be medium (eg, 350 g to 600 g or 500 g to 1000 g) and large (eg, 6 g).
In the case of more than 00 g or more than 1000 g), the disc 23 is controlled so that its openings 23a alternate between the upper position and the lower position. In this case, when the amount of rice or side dishes is not less than medium, the control device 43 causes the disc 23 to have the opening 2 thereof.
3a is controlled so that the time when it is stopped at the lower position is shorter than the time when it is stopped at the upper position.
Control is performed so that the ratio of the time when the 3a is stopped at the upper position to the lower position is large. This is because the height dimension of rice or side dish becomes larger as the weight thereof becomes larger.

(B) Raw Thaw In this case, the control device 43 controls the weight of the thawed food, which is the cooked food, to be small (for example, less than 200 g) and medium (for example, 2).
00g-400g) and large quantities (eg, over 400g), the disk 23 is controlled such that its openings 23a alternate between upper and lower positions. However, in this case, as the weight of the thawed food increases, the control device 43
The disc 23 is controlled so that the opening 23a is stopped at the upper position and the lower position for a longer time.

(C) Liquor can and milk In this case, the control device 43 controls the amount of liquor or milk as cooking food to be small (for example, less than 350 g or less than 400 g).
In the case of, the disc 23 is controlled so that the opening 23a is at the lower position. Further, the control device 43 controls the medium amount of alcohol or milk (for example, 350 g to 700 g or 400 g to
800 g) and a large amount (more than 700 g or more than 800 g), the disk 23 is controlled so that the openings 23a thereof alternate between the upper position and the lower position. In this case, the control device 43 controls the disc 2 when the amount of alcohol or milk is medium or more.
3 is controlled so that the time during which the opening 23a is stopped at the lower position is shorter than the time when the opening 23a is stopped at the lower position.
3 is controlled so that the ratio of the time when the opening 23a is stopped at the lower position is large relative to the time when the opening 23a is stopped at the lower position.

Thus, according to this embodiment, the disc 23
Since the opening 23a is rotated to the upper position or the lower position, or is alternately rotated to the upper position and the lower position, it is possible to obtain a plurality of heating modes. Unlike the conventional example, the optimum heating pattern can be selected according to the food condition such as the type, shape or weight of the cooked food, and the optimum cooking can be performed.

In this case, the microwave from the magnetron 29 is supplied into the hollow box 19 through the waveguide 28 and then radiated into the heating chamber 4 through the opening 23a of the disc 23. Drive shaft 2 which is part of the drive means
2 is located in the hollow box 19 instead of the waveguide 28 in a high electric field, and the waveguide 2 is different from the second conventional example.
The magnetron 29 can perform a stable oscillating operation without generating a spark in 8 and changing the impedance.

Further, since the disk 23 serving as a moving body is constructed so as to be rotated by the disk motor 21 via the drive shaft 22, for example, a plurality of openings are selectively opened and closed by the valve body. Compared with the configuration, the hollow box 19 can be made thinner, and there is an advantage that it can be made smaller as a whole.

The back plate 3a of the inner box 3 which is the chamber wall of the heating chamber 4
Since the choke portion 24 is formed between the circular plate 23 and the circular plate 23, the microwaves in the hollow box 19 are reflected by the back plate 3a and the circular plate 2.
3 does not leak into the heating chamber 4, so that microwaves are radiated into the heating chamber 4 only from the opening 23a of the disk 23, and the heating pattern depending on the position of the opening 23a is generated. Definitely executed.

In this case, the choke section 2
4 is a rising portion 3c of the back plate 3a and a rising portion 2 of the disc 23.
Since it is formed by 3b, as compared with the case where the back plate 3a and the disc 23 are wrapped back and forth to form the choke portion, the disc 23 can be easily assembled from the front side. Assembleability is improved.

Further, when the food selection key 7 is selectively pressed, the control device 43 recognizes the cooked food and controls the position of the opening 23a of the disc 23 so as to be suitable for the cooked food. The optimum heating mode for the cooked food is automatically selected only by operating the food selection key 7, which is extremely convenient in use.

Further, at the time of raw thawing, the magnetron 29 is intermittently oscillated to reduce the heating output, and the disc 23 is stopped while the magnetron 29 is oscillating.
Since the opening 23a is alternately switched to the upper position or the lower position by rotating, the rotational movement of the disk 29 does not adversely affect the oscillation operation of the magnetron 29.

In this case, the disc 23 is rotated during the heating operation of the cooked food by the magnetron 29 according to the output as the detection result of the gas sensor 16 to switch the position of the opening 23a. Accordingly, the heating pattern can be switched during the heating operation, and a more optimal heating mode can be executed.

In addition, the controller 43 controls the weight sensor 13
23a of the disc 23 according to the detection output as the detection result of
Since the position of is determined, optimum heating can be performed regardless of the weight of the cooked food.

In addition, at the time of raw thawing, the control device 43
Since the disc 23 is controlled so that the openings 23a thereof are alternately arranged in the upper position and the lower position, the frozen food for sashimi can be thawed uniformly, and moreover, depending on the weight of the frozen food. Since the ratio of the stop time at the upper position to the stop time at the lower position of the opening 23a is changed, the frozen food for sashimi can be uniformly thawed regardless of the weight.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications or expansions are possible. Although the rotating disk 23 is provided as the moving body, a sliding plate that slides may be provided instead. In this case, the sliding plate 23 may be provided between the chamber wall of the heating chamber 4 and the sliding plate. It is preferable to form the choke portion by the formed rising portion. Control device 43
Although it is configured by software mainly including a microcomputer, it may be configured by hardware. The upper and lower heaters 50 and 51 for open cooking or grill cooking may be provided as needed. Although the control device 43 is configured to control the disc 23 so that the opening 23a of the disc 23 is located at either the upper position or the lower position, the control device 43 may control the opening 23a to be located at any position.

[0075]

According to the microwave oven of the first aspect of the present invention, since the microwave radiating opening can be moved into the heating chamber together with the moving body, it is possible to obtain a plurality of heating modes and to prepare cooked food types. Appropriate heating can be performed according to the food condition such as shape or weight.

According to the microwave oven of the second aspect, since the microphone wave from the magnetron is supplied to the cavity through the waveguide and then radiated from the opening of the moving body into the heating chamber,
Even if there is a driving means for driving the moving body, a spark is not generated or the impedance is not changed, and stable oscillation can be performed.

According to the microwave oven of the third aspect, since the moving body is configured to rotate, for example, the hollow portion can be made thinner than in the case where a plurality of openings are opened and closed by the valve body. be able to.

According to the microwave oven of the fourth aspect, in the choke portion between the moving body and the chamber wall of the heating chamber, microwave leaks into the heating chamber from between the moving body and the chamber wall of the heating chamber. Therefore, the microwave is supplied into the heating chamber only from the opening, and therefore the heating mode depending on the position of the opening is surely executed.

According to the microwave oven of the fifth aspect, since the choke portion is constituted by the rising portion formed between the moving body and the chamber wall of the heating chamber, the moving body wraps with the chamber wall, for example. Assembling is improved as compared with the case of the configuration.

According to the microwave oven of the sixth aspect, since the control means moves the moving body in response to the operation of the food selection key, the optimum heating mode for the cooked food can be obtained only by operating the food selection key. It is automatically selected.

According to the microwave oven of the seventh aspect, by moving the moving body, it is possible to switch between the case where the microwave is radiated into the heating chamber from the upper side and the case where the microwave is radiated from the lower side.

According to the eighth aspect of the present invention, since the control means moves the moving body while the magnetron oscillation operation is stopped, the moving operation of the moving body does not adversely affect the magnetron oscillation operation.

According to the microwave oven of the ninth aspect, since the control means moves the moving body during the heating operation by the magnetron, it is possible to switch the heating mode during the heating operation.

According to the microwave oven of the tenth aspect, the control means moves the moving body in the middle of the heating operation according to the detection result of the gas sensor, so that the heating mode can be switched to the optimum time.

According to the microwave oven of the eleventh aspect, the control means controls the moving position of the moving body according to the weight of the cooked food,
That is, since the opening position is determined, the optimum heating mode according to the weight of the cooked food is executed.

According to the microwave oven of the twelfth aspect of the present invention, the control means moves the moving body so that the opening thereof is alternately located at the upper and lower positions during the raw thawing. Therefore, the frozen food for cooking sausage Can be thawed uniformly.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional front view of the whole.

FIG. 2 is an overall perspective view

FIG. 3 is a cross-sectional plan view of the main part

FIG. 4 is a rear view of the main part

FIG. 5 is a cross-sectional plan view of a choke portion.

FIG. 6 is a configuration diagram of an electric circuit

FIG. 7: Arrangement configuration diagram of a cup filled with water

FIG. 8 is a diagram showing experimental results.

FIG. 9 is an explanatory diagram of a first control example.

FIG. 10 is an explanatory diagram of a second control example.

[Explanation of reference numerals] In the drawings, 1 is a main body, 3 is an inner box, 3a is a back plate (chamber wall), 3
c is a rising part, 4 is a heating chamber, 6 is an operation panel, 7 is a food selection key, 10 is a turntable, 11 is a turntable motor, 13 is a weight sensor, 16 is a gas sensor, 1
9 is a hollow box (hollow part), 21 is a disk motor (driving means), 22 is a drive shaft (a part of the driving means), 23 is a disk (moving body), 23a is an opening, 23b is a rising part, Reference numeral 24 is a choke portion, 25 is a rotation control cam, 26 and 27 are position detecting microphone switches, 28 is a waveguide, 29 is a microswitch, and 43 is a control device (control means).

Claims (12)

[Claims] 1. A heating chamber, a magnetron for supplying microwaves to the heating chamber, and a movably provided so as to substantially form a part of a wall of the heating chamber. A moving body having an opening for radiating a microwave into the heating chamber, a driving means for driving the moving body, and a control means for controlling the driving means to move the moving body according to the cooked food. A microwave oven. 2. A heating chamber, a cavity provided outside a chamber wall of the heating chamber, a waveguide provided in communication with the cavity, and a microwave supplied to the waveguide. A magnetron and movably provided in the cavity so as to substantially form a part of the chamber wall of the heating chamber, and radiates the microwave supplied from the waveguide into the cavity into the heating chamber. A microwave oven comprising: a moving body having an opening for driving, a driving means for driving the moving body, and a control means for controlling the driving means to move the moving body according to cooked food. 3. The microwave oven according to claim 1, wherein the moving body is configured to rotate. 4. A choke portion is formed between the moving body and the chamber wall of the heating chamber.
Microwave oven according to any one of. 5. The microwave oven according to claim 4, wherein the choke portion includes a rising portion formed on the moving body and the chamber wall of the heating chamber. 6. A food selection key for selecting a cooked food, wherein the control means is configured to control the drive means in response to the operation of the food selection key to determine the movement position of the moving body. The microwave oven according to claim 1, wherein the microwave oven is a microwave oven. 7. The moving body is configured so that the opening is moved upward and downward, and the control means stops the moving body in an upper position mode in which the opening is stopped in an upper position and in a lower position. The microwave oven according to any one of claims 1 to 3, wherein the microwave oven is configured to move so as to selectively execute the lower position mode. 8. The magnetron is controlled to intermittently oscillate, and the control means is configured to move the moving body while the magnetron is oscillating. 3. The microwave oven according to any one of 3 above. 9. The microwave oven according to claim 1, wherein the control means is configured to move the moving body during the heating operation by the magnetron. 10. A gas sensor for detecting the gas in the heating chamber is provided, and the control means is configured to move the moving body in accordance with a detection result of the gas sensor. Microwave oven according to any one. 11. A weight sensor for detecting the weight of the cooked food housed in the heating chamber is provided, and the control means is configured to determine the moving position of the moving body according to the detection result of the weight sensor. The microwave oven according to any one of claims 1 to 3, wherein: 12. The control means is configured to control the moving body so that the opening thereof is alternately located at an upper position and a lower position at the time of raw thawing. Microwave oven as described.