JP2003287232A - Heat-cooking appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an appliance for heat-cooking foods and detecting areas of the foods. <P>SOLUTION: The heat-cooking device comprises a temperature measuring means 605 to measure the temperature at each area in a heating chamber 4 in a non-contact manner, a brightness measuring means 606 to measure the brightness of each area in the heating chamber 4, and a direction variable means 600 to change the direction of the visual field of the temperature measuring means 605 and the direction variable means 600. The temperature measuring means 605 and the brightness measuring means 606 measure the temperature and the brightness of the same area. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating / cooking device for heating foodstuffs with electromagnetic waves.

[0002]

2. Description of the Related Art Conventionally, as a device for measuring the position or area of foodstuffs, JP 2001-250672 A, JP 10-196967 A and JP 9-2293 A have been used.
There is an example of Japanese Patent Publication No. 72.

In Japanese Patent Laid-Open No. 2001-250672, the field of view of the infrared sensor is moved in the depth direction and width direction of the heating chamber, and the position where the temperature output of the infrared sensor shows a peak is determined as the position of the object to be heated. The rotating antenna is rotated to the rotation position where it is heated most efficiently at the mounting position of the object to be heated and stopped.

Japanese Unexamined Patent Publication No. 10-196967 finds the size and position of an object to be heated based on the output of an image sensor,
In accordance with this, the orientation is controlled so that the object to be heated is included in the visual field of the temperature sensor, and the output of the temperature sensor is corrected.

Japanese Unexamined Patent Publication No. 9-229372 discloses a weight detecting means for measuring each area of the heating chamber divided into 5 × 5, and a plurality of optical sensors (light emitting portion and light receiving portion) installed on the side surface of the heating chamber. It was to detect the weight and shape of the object to be heated and determine the area to be heated preferentially.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the conventional technology of Japanese Patent No. 672, only the position of the object to be heated can be detected, and therefore, when a large object to be heated is mounted in the refrigerator, there is a problem in that it is locally heated and uneven heating occurs. Further, when the temperature of the object to be heated is room temperature or lower, there is a problem that the region of the object to be heated cannot be detected. Further, there is a problem that it is not possible to confirm whether or not the temperature of the object to be heated is normally measured because the temperature measurement portion cannot be seen.

In the prior art disclosed in Japanese Patent Laid-Open No. 10-196967, it is necessary to process an image, and high speed processing is possible.
Since a D (analog / digital conversion) chip and a processing device are required, there is a problem that the apparatus cost increases.
In addition, there is a problem in that it is not possible to confirm whether the temperature measurement is normally performed because the temperature measurement portion cannot be seen.

Further, the conventional technique disclosed in Japanese Patent Laid-Open No. 9-229372 has a problem that the cost of the apparatus is high because it has a large number of weight detecting means and optical sensors. Further, there is a problem that it is impossible to confirm whether or not the temperature is normally measured because the temperature measurement portion cannot be seen.

A first object of the present invention is to provide a device which has a low device cost and detects the region even when an object to be heated at room temperature is introduced.

A second object of the present invention is to provide an apparatus which has a low apparatus cost and improves the accuracy of measuring the temperature of an object to be heated and shortens the time.

A third object of the present invention is to provide a device which is low in device cost and efficiently heats the entire object to be heated.

A fourth object of the present invention is to provide a device which has a low device cost and confirms that the temperature of the object to be heated is normally measured.

[0013]

The first object is to provide a temperature measuring means for measuring the temperature of each area in the heating chamber in a non-contact manner, and a brightness measuring means for measuring the brightness of each area in the heating chamber. It is achieved by a heating cooker characterized by comprising temperature measuring means and means for changing the direction of the visual field of the brightness measuring means, and the temperature measuring means and the brightness measuring means being arranged side by side so as to measure the same region.

The second object is to detect the area of the object to be heated in the heating chamber measured by the brightness measuring means and to detect the field of view of the temperature measuring means in the area of the object to be heated during heating of the object to be heated. A heating cooker characterized by measuring the temperature of an object to be heated.

Further, the third object mentioned above is provided with a magnetron for generating an electromagnetic wave and a rotary antenna for concentrating the electromagnetic wave and sending it to the heating chamber, and the area of the object to be heated in the heating chamber measured by the brightness measuring means. Is detected and the rotary antenna is controlled to rotate so as to concentrate the electromagnetic waves on the region of the object to be heated.

Further, the above-mentioned fourth object is achieved by a heating cooker characterized in that the temperature measuring means is provided with a light emitting means for emitting light to an area in the heating chamber where the temperature is being measured. .

The second object is to provide a temperature measuring means for measuring the temperature of each region in the heating chamber and a means for changing the direction of the visual field of the temperature measuring means, and the temperature measuring means measures the temperature in the heating chamber. Detects the area of the object to be heated based on the temperature of
This is achieved by a heating cooker characterized by changing the direction of the temperature measuring means and scanning the area of the object to be heated during heating of the object to be heated to measure the temperature of the object to be heated.

The third purpose is to provide a temperature measuring means for measuring the temperature of each region in the heating chamber, a magnetron for generating an electromagnetic wave, and a rotating antenna for concentrating the electromagnetic wave, and the temperature measuring means measures the temperature. Achieved by a heating cooker characterized by detecting the area of the object to be heated based on the temperature in the heating chamber, controlling the rotation of the rotating antenna, and moving the part that concentrates electromagnetic waves in the area of the object to be heated. To be done.

The fourth purpose is to measure the temperature of each region in the heating chamber, the means for changing the direction of the visual field of the temperature measuring means, and the temperature measuring means to measure the temperature. And a light emitting means for emitting light in an area inside the heating chamber.

The first purpose is to measure the temperature of each area in the heating chamber by the temperature measuring means during heating and detect the area of the object to be heated based on the rising temperature of the object to be heated. This is achieved by a heating cooker characterized in that

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of an embodiment of the heating cooker according to the present invention.

In one embodiment of the present invention, a main body 1 and a door 2 are provided.
And an operation panel 3. Heating chamber 4 in main body 1
Then, the door 2 is opened, and the article to be heated 21 (food) is put into and taken out of the heating chamber 4.

FIG. 2 shows the construction of an embodiment of the heating cooker according to the present invention.

In one embodiment of the present invention, the heating chamber 4 and the bottom plate 5 are
And a rotary antenna 6, an antenna motor 7, a magnetron 8, a waveguide 9, a control means 10, a temperature / brightness detection means 11, a door sensor 12, an operation panel 3, and a light 13. There is. The heating chamber 4 is a place where the object to be heated 21 is installed, and the electromagnetic waves generated by the magnetron 8 are sent to the heating chamber 4 through the waveguide 9 to warm the object to be heated 21. A bottom plate 5 made of a non-conductor such as glass or ceramic is installed at the bottom of the heating chamber 4. The rotating antenna 6 made of a conductor such as aluminum concentrates the electromagnetic waves sent from the waveguide 9 and sends the electromagnetic waves to the heating chamber 4.

FIG. 3 is a plan view showing an embodiment of the rotary antenna 6, in which a circular plate 301 is provided with a hole 302.
With this shape, the electromagnetic wave sent from the waveguide 9 can be transmitted through the hole 3
It can be sent to the heating chamber 4 by concentrating it on 02 and rotating it.

A motor shaft 7 of an antenna motor 7 provided below the waveguide 9 for rotating the rotating antenna 6.
It is attached to a. The antenna motor 7 is connected to the control means 10 and rotates or stops based on a signal from the control means 10 to rotate or stop the rotating antenna 6.

Further, the magnetron 8 is connected to the control means 10, generates an electromagnetic wave based on a signal from the control means 10, and sends the electromagnetic wave to the waveguide 9. The waveguide 9 sends the electromagnetic wave generated from the magnetron 8 to the rotating antenna 6.

The control means 10 such as a microprocessor includes a temperature / brightness detection means 11, a door sensor 12, an operation panel 3, a magnetron 8, an antenna motor 7 and a light 13.
Connected to the temperature / brightness detecting means 11 and the door sensor 12
And the object to be heated 21 based on the output signal from the operation panel 3
The area is detected and the magnetron 8, the antenna motor 7 and the light 13 are controlled.

The temperature / brightness detecting means 11 is installed outside the upper side surface of the heating chamber 4 as shown in FIG.
0, and measures the temperature and brightness of the heating chamber 4 and the temperature of the object to be heated 21 based on the signal from the control means 10.

Door sensor 1 such as a mechanical contact switch
Reference numeral 2 is connected to the control means 10, detects the opening and closing of the door 2, and sends a signal to the control means 10.

The operation panel 3 is connected to the control means 10 and has a start button 31 and a temperature setting function 32. When the start button 31 is pressed,
The heating start signal and the finish temperature are sent to the control means 10.

As shown in FIG. 4, the light 13 is installed beside the temperature / brightness detecting means 11 above the side surface of the heating chamber 4 and illuminates the heating chamber 4. Further, it is connected to the control means 10 and turned on or off based on a signal from the control means 10.

The operation procedure in one embodiment of the heating cooker of the present invention shown in FIG. 2 will be described with reference to the operation diagram of FIG.

Step 501: When the door 2 is closed,
The door sensor 12 detects that the door 2 is closed,
A "close" signal is sent to the control means 10.

Step 502: When the control means 10 receives the "closed" signal from the door sensor 12, it sends a lighting signal to the light 13 and a signal to start measuring the temperature and brightness to the temperature / brightness detection means 11. The light 13 receives a lighting signal from the control means 10 and lights up. Temperature / brightness detection means 11
Receives a signal to start measuring the temperature and the brightness from the control means 10, measures the temperature distribution and the brightness distribution of the heating chamber 4,
Send their distribution to the control means 10. The control means 10
It receives the temperature distribution and the brightness distribution from the temperature / brightness detecting means 11 and sends a light-off signal to the light 13. Light 13
Receives a turn-off signal from the control means 10 and turns off the light.

Step 503: The control means 10 controls the temperature
The difference between the maximum value and the minimum value of the temperature distribution measured by the lightness detecting means 11 is calculated. If the difference is less than a certain threshold value, it is determined that there is no object to be heated 21, and the process proceeds to step 504. If the difference between the maximum value and the minimum value of the temperature distribution is greater than or equal to a threshold value, it is determined that there is the object to be heated 21, and the process proceeds to step 505.

Step 504: The control means 10 controls the temperature
The brightness distribution measured by the brightness detection means 11 is used as the object to be heated 2
It is stored as a brightness distribution in the absence of 1.

Step 505: The control means 10 controls the temperature
Brightness distribution measured by the brightness detection means 11 and the object to be heated 21
The difference in the brightness distribution in the absence of light is calculated, the area having the difference equal to or larger than a threshold value is determined to be the object to be heated 21, and the area of the object to be heated 21 is detected.

Step 506: When the start button 31 is pressed, the operation panel 3 sends a heating start signal and a finishing temperature to the control means 10.

Step 507: When the control means 10 receives the heating start signal and the finishing temperature from the operation panel 3, it sends an operation start signal to the magnetron 8 and a lighting signal to the light 13. The magnetron 8 receives the operation start signal from the control means 10, operates, and outputs an electromagnetic wave. The light 13 receives a lighting signal from the control means 10 and lights up.

Step 508: The control means 10 sends a rotation instruction signal to the antenna motor 7 so that the hole 302 of the rotary antenna 6 is located in the area of the object to be heated 21. The antenna motor 7 rotates according to a rotation instruction signal from the control means 10. For example, when the object to be heated 21 is arranged in the area from the center to the front, the hole 302 of the rotary antenna 6 is reciprocated in the area where the object to be heated 21 exists. As a result, the electromagnetic waves sent from the waveguide 9 are concentrated in the hole 302 of the rotary antenna 6, the electromagnetic waves are concentrated in the object to be heated 21 above the hole 302, and the hole 302 of the rotary antenna 6 moves. The entire object to be heated 21 that falls within the range is warmed. When the object to be heated 21 is in the center or the object to be heated 21 is large, the rotary antenna 6 is caused to rotate at a constant speed. As a result, electromagnetic waves can be sent to the entire heating chamber 4.

Step 509: The control means 10 sends to the temperature / brightness detection means 11 a temperature measurement instruction signal for measuring the temperature of the region of the article to be heated 21. Temperature / brightness detection means 11
Receives the temperature measurement instruction signal from the control means 10,
The temperature distribution in the area of the object to be heated 21 is measured, and the control means 10
The temperature distribution in the region of the object to be heated 21 is sent to. The measurement and transmission of the temperature distribution in the area of the object to be heated 21 are repeated.

Step 510: The control means 10 controls the temperature
When the temperature distribution in the area of the object to be heated 21 is received from the brightness detecting means 11 and the temperature of the object to be heated 21 reaches the finish temperature, an operation stop signal is sent to the magnetron 8, a light-off signal is sent to the light 13, and an antenna motor 7 is sent to the antenna motor 7. A stop signal is sent to the temperature / brightness detecting means 11 as a temperature measurement stop signal. The magnetron 8 receives the operation stop signal and stops the generation of electromagnetic waves. The light 13 goes out. The antenna motor 7 stops. The temperature / brightness detecting means 11 stops the temperature measurement.

FIG. 6 shows an embodiment of the temperature / brightness detecting means 11. One example of the temperature / brightness detecting means 11 is
Brightness measuring unit 601, vertical motor 602, jig 60
3 and a lateral motor 604.

The temperature / brightness measuring unit 601 comprises a temperature measuring means 605 and a lightness measuring means 606. The temperature measuring means 605 and the lightness measuring means 606 are arranged side by side so that the fields of view of sensing are the same. ing.

The temperature measuring means 605 such as an infrared sensor (thermopile or the like) measures the temperature of a certain region of the heating chamber 4 in a non-contact manner. The brightness measuring means 606 such as a phototransistor or a photodiode measures the brightness (brightness) of a certain area of the heating chamber 4.

The vertical motor 602 has its shaft (not shown) attached to the temperature / brightness measuring section 601, and the main body of the vertical motor 602 is attached to the jig 603. By rotating
The orientation of the temperature / brightness measuring unit 601 is changed to the vertical direction.

The jig 603 is attached to the shaft (not shown) of the horizontal motor 604 and the main body of the vertical motor 602.

The horizontal motor 604 has its shaft attached to the jig 603, and by rotating the shaft of the horizontal motor 604, the jig 603, the vertical motor 602, and the temperature / brightness measuring unit 601 are oriented. Change laterally.

The vertical motor 602, the horizontal motor 604, and the jig 603 are collectively referred to as a direction changing means (60).
0).

The operation of one embodiment of the temperature / brightness detecting means 11 shown in FIG. 6 will be described.

When a signal for starting the measurement of temperature and brightness is received from the control means 10, the vertical motor 602 and the horizontal motor 604 are rotated so that the temperature as shown by the trajectory 701 at the center of the visual field in FIG. The field of view of the brightness measuring unit 601 is changed, the temperature of each region of the heating chamber 4 is measured by the temperature measuring unit 605, the brightness is measured by the brightness measuring unit 606, and the temperature distribution and the brightness distribution of the heating chamber 4 are controlled by the control unit 10. To send.

When a temperature measurement instruction signal for measuring the temperature of the area of the object to be heated 21 is received from the control means 10, the vertical motor is operated so that the field of view of the temperature / brightness measuring unit 601 scans the area of the object to be heated 21. 602 and lateral motor 60
4 is rotated, the temperature of the region of the object to be heated 21 is measured by the temperature measuring means 605, and the temperature distribution of the object to be heated 21 is sent to the control means 10.

In the embodiment of the heating cooker of the present invention shown in FIG. 2, even if the temperature / brightness detecting means 11 is installed at the upper back of the side wall of the heating chamber 4, the temperature distribution and the brightness of the heating chamber 4 are increased. The distribution of temperature and the temperature distribution of the object to be heated 21 can be measured.

Conventionally, the area of the object to be heated 21 has been detected based on the output image of the heating chamber 4 from the image sensor. In the embodiment of the heating cooker of the present invention shown in FIG. 2, the brightness measuring means 606 such as a phototransistor or a photodiode is used to detect the region of the object to be heated 21. Since the signal from the lightness measuring unit 606 has a smaller capacity than an image, it can be processed even by the control unit 10 (microprocessor) having a low data acquisition performance and a low processing performance, so that the apparatus cost can be reduced.

Conventionally, the temperature distribution of the heating chamber 4 is measured by an infrared sensor, and the position of the object to be heated 21 is detected when the temperature shows a peak. Therefore, the object to be heated 21 is at room temperature or smaller than room temperature. Case 21 to be heated at the start of heating
Position could not be detected. Further, since the area of the object to be heated 21 cannot be detected, the object to be heated 2
When 1 is large, there is a problem that only the central portion of the object to be heated 21 can be heated.

In the embodiment of the heating cooker of the present invention shown in FIG. 2, since the area of the object to be heated 21 is detected based on the brightness distribution of the heating chamber 4, the object to be heated 21 is at room temperature or at room temperature. Even if it is small, the area of the object to be heated 21 can be detected, electromagnetic waves can be concentrated on the object to be heated 21 from the start of heating, and the heating time can be shortened.

Further, since the area of the object to be heated 21 is detected and the portion where the electromagnetic waves are concentrated is moved by the control of the rotating antenna 6, the object to be heated 21 is heated regardless of the size of the object to be heated 21. The whole can be heated.

Conventionally, the weight sensor 14 is installed in each of the 5 × 5 divided regions of the heating chamber 4, and a plurality of optical sensors are installed on the side wall of the heating chamber 4. In one embodiment of the heating cooker of the present invention shown in FIG. 2, one infrared sensor (temperature measuring means 6
05), one phototransistor (brightness measuring means 60
6) and the two motors (vertical direction motor 602 and horizontal direction motor 604) can detect the area of the object to be heated 21, so that the device cost can be reduced.

In the embodiment of the heating cooker of the present invention shown in FIG. 2, since the temperature / brightness detecting means 11 measures only the temperature of the region of the object to be heated 21 during heating, the temperature distribution of the entire heating chamber 4 is shown. It is possible to shorten the measurement time of the temperature distribution of the object to be heated 21 as compared with the case of measuring.

In the embodiment of the heating cooker according to the present invention shown in FIG. 2, since the measurement time of the temperature distribution of the object to be heated 21 is short, the object to be heated 21 is easily brought to the finish temperature. For example,
When the temperature distribution of the entire heating chamber 4 is measured and the measurement time of the temperature distribution is long, the measured temperature of the object to be heated 21 during heating is 52
Assuming that the temperature is 58 ° C., 58 ° C., and 64 ° C., if the finishing temperature is 60 ° C., the heating is stopped when the object to be heated 21 reaches 64 ° C.

On the other hand, when the area of only the object to be heated 21 is measured and the temperature distribution measurement time is short, the measured temperature of the object to be heated 21 is 52 ° C., 55 ° C., 58 ° C. and 61 ° C. during heating. Becomes smaller and the temperature of the object to be heated 21 reaches 61 ° C., the heating can be stopped.

In step 509 of the operation of the embodiment of the heating cooker of the present invention shown in FIG. 5, the temperature in the region of the object to be heated 21 is repeatedly measured by the temperature / brightness detecting means 11 during heating, and the average value is obtained. Therefore, as compared with the case where the temperature distribution of the entire heating chamber 4 is measured, the temperature measurement accuracy can be increased in the same measurement time.

In the embodiment of the heating cooker of the present invention shown in FIG. 2, the field of view of the brightness of the brightness measuring means 606 is made smaller than that of the temperature measuring means 605.
When the temperature of the object to be heated 21 is calculated based on the area ratio of the area of the object to be heated 21 in the field of view of the temperature measurement and the measured temperature of the area without the object to be heated 21.

[0065]

[Formula 1] Therefore, the accuracy of the measurement temperature of the object to be heated 21 can be improved.

In one embodiment of the heating cooker of the present invention shown in FIG. 2, in order to measure the temperature of the region of the object to be heated 21,
Higher temperature reliability than measuring the temperature at one location.

In the embodiment of the heating cooker according to the present invention shown in FIG. 2, the temperature / brightness detecting means 11 and the light 13 are arranged close to each other as shown in FIG. Thus, the shadow of the object to be heated 21 is less likely to appear, so that the region of the object to be heated 21 can be measured with high accuracy.

In the embodiment of the heating cooker of the present invention shown in FIG. 2, if another light (not shown) is additionally installed beside the temperature / brightness detecting means 11 in FIG. Since the shadow of the object to be heated 21 is less likely to appear than in the case of only one, it is possible to measure the region of the object to be heated 21 with higher accuracy.

In the embodiment of the heating cooker of the present invention shown in FIG. 2, four weight sensors 14 (such as a capacitance type weight sensor) shown in FIG. 9 (a sectional view taken along the broken line 101 in FIG. 1) are shown. Are arranged near the corners of the bottom plate 5, respectively.
In steps 502 and 503 of the operation of the embodiment of the heating cooker of the present invention shown in FIG. 1, the temperature / brightness detecting means 11 measures the brightness distribution of the heating chamber 4, and the weight sensor 1
4 to measure the weight of the object 21 to be heated,
When the weight of 1 is zero, it is determined that there is no object to be heated 21,
When the weight of the object to be heated 21 is not zero, it is determined that the object to be heated 21 exists. As a result, the accuracy of determining the presence or absence of the object to be heated 21 is higher than that in determining the presence or absence of the object to be heated 21 based on the temperature distribution.

The temperature / brightness measuring section 6 of the temperature / brightness detecting means 11 in the embodiment of the heating cooker according to the present invention shown in FIG.
When a light emitting means 607 such as a light emitting diode is additionally installed in 01 so as to be in the same direction as the sensing directions of the temperature measuring means 605 and the brightness measuring means 606 as shown in FIG. Since the light is applied to the measurement area (visualization of the sensing area), it is possible to confirm whether or not the object to be heated 21 is normally sensed during heating.

FIG. 10 shows the configuration of an embodiment of the heating cooker according to the present invention. One embodiment of the present invention includes a heating chamber 4 and a bottom plate 5.
1, a rotary antenna 6, an antenna motor 7, a magnetron 8, a waveguide 9, a control unit 10, a temperature measuring unit 15, a door sensor 12, an operation panel 3, and a temperature sensor 16. As shown in FIG. 4, the temperature measuring means 15 is installed outside the upper side surface of the heating chamber 4, and based on a signal from the control means 10, the heating chamber 4 or the object 2 to be heated 2 is heated.
The temperature distribution in the area 1 is measured. Further, it is connected to the control means 10.

The temperature sensor 16 is installed outside the heating chamber 4 and measures the temperature in the vicinity of the heating chamber 4. Further, it is connected to the control means 10.

The other components are the same as those of the heating cooker according to the present invention shown in FIG.

The operation of the embodiment of the heating cooker of the present invention shown in FIG. 10 will be described with reference to FIG.

Step 1101: When the start button 31 is pressed, the operation panel 3 sends a heating start signal and a finishing temperature to the control means 10. When the control means 10 receives the heating start signal and the finishing temperature from the operation panel 3,
An operation start signal is sent to the magnetron 8, a rotation start signal is sent to the antenna motor 7, a temperature measurement signal is sent to the temperature sensor 16, and a temperature distribution measurement signal for the heating chamber 4 is sent to the temperature measuring means 15.

Step 1102: The magnetron 8 receives the operation start signal from the control means 10, operates and outputs an electromagnetic wave to the waveguide 9. The antenna motor 7 receives the rotation start signal and rotates to rotate the rotating antenna 6.

Step 1103: The temperature sensor 16 receives a temperature measurement signal from the control means 10, measures the temperature near the heating chamber 4, and sends the temperature near the heating chamber 4 to the control means 10.

Step 1104: The temperature measuring means 15
A measurement signal of the temperature distribution of the heating chamber 4 is received from the control means 10, the temperature distribution of the heating chamber 4 is measured, and the temperature distribution of the heating chamber 4 is sent to the control means 10.

Step 1105: The control means 10 measures the temperature in the vicinity of the heating chamber 4 from the temperature sensor 16 by the temperature measuring means 1
5 receives the temperature distribution of the heating chamber 4, subtracts the temperature in the vicinity of the heating chamber 4 from the temperature distribution, and if the difference is greater than or equal to a threshold value, which is one of the differences, detects the area of the object to be heated 21 in the heating chamber 4. Is determined to be possible, and the process proceeds to step 1106. If the difference between them is less than the threshold value for all the regions, it is determined that the region of the object to be heated 21 in the heating chamber 4 cannot be detected, and the process returns to step 1104.

Step 1106: The control means 10 subtracts the temperature in the vicinity of the heating chamber 4 from the temperature distribution, determines that there is an object to be heated 21 in a region that is equal to or more than a certain threshold among the differences, and the object to be heated 21 is Detect the area.

Step 1107: The control means 10 sends a rotation instruction signal to the antenna motor 7 so that the hole 302 of the rotary antenna 6 is located in the area of the object to be heated 21. The antenna motor 7 rotates according to a rotation instruction signal from the control means 10. For example, when the object to be heated 21 is arranged in the area from the center to the front, the hole 302 of the rotary antenna 6 is reciprocated in the area where the object to be heated 21 exists. As a result, the electromagnetic waves sent from the waveguide 9 are concentrated in the hole 302 of the rotary antenna 6, the electromagnetic waves are concentrated in the object to be heated 21 above the hole 302, and the hole 302 of the rotary antenna 6 moves. The entire object to be heated 21 that falls within the range is warmed. When the object to be heated 21 is at the center or the object to be heated 21 is large, the rotary antenna 6 is rotated at a constant speed. Thereby, electromagnetic waves can be sent to the entire heating chamber 4.

Step 1108: The control means 10 sends to the temperature measuring means 15 a measurement signal of the temperature distribution of the object to be heated 21 for measuring the temperature of the area of the object to be heated 21. The temperature measuring means 15 receives the measurement signal of the temperature distribution of the article to be heated 21 from the control means 10, measures the temperature distribution of the area of the article to be heated 21, and causes the control means 10 to determine the temperature distribution of the area of the article to be heated 21. send. The measurement and transmission of the temperature distribution in the area of the object to be heated 21 are repeated.

Step 1109: The control means 10 receives the temperature distribution of the area of the object to be heated 21 from the temperature measuring means 15, and when the temperature of the object to be heated 21 reaches the finishing temperature, an operation stop signal is sent to the magnetron 8. A stop signal is sent to the antenna motor 7 and a temperature measurement stop signal is sent to the temperature measuring means 15. The magnetron 8 receives the operation stop signal and stops the generation of electromagnetic waves. The antenna motor 7 stops.
The temperature measuring means 15 stops measuring the temperature of the area of the object to be heated 21.

FIG. 12 shows an embodiment of the temperature measuring means 15. An example of the temperature measuring means 15 is a temperature measuring unit 17
A vertical motor 602, a jig 603, and a horizontal motor 604.

The temperature measuring section 17 is provided with a temperature measuring means 15. The temperature measuring means 15 such as an infrared sensor (thermopile or the like) measures the temperature of each region of the heating chamber 4 in a non-contact manner.

The vertical motor 602 has its shaft (not shown) attached to the temperature measuring unit 17, and
The main body of No. 02 is attached to the jig 603, and by rotating the shaft of the vertical motor 602, the temperature measuring unit 1
Change the direction of 7 vertically.

Further, the jig 603 is provided with a lateral motor 604.
The shaft and the body of the vertical motor 602 are attached.

The lateral motor 604 has its shaft (not shown) attached to the jig 603, and the lateral motor 604
The orientation of the jig 603, the vertical direction motor 602, and the temperature measuring unit 17 is changed to the horizontal direction by rotating the axis of.

The operation of one embodiment of the temperature measuring means 15 shown in FIG. 12 will be described.

When the measurement signal of the temperature distribution of the heating chamber 4 is received from the control means 10, by rotating the vertical motor 602 and the horizontal motor 604, as shown by the trajectory 701 at the center of the visual field in FIG. The field of view of the measuring section 17 is changed, the temperature measuring means 15 measures the temperature of each region of the heating chamber 4, and the temperature distribution of the heating chamber 4 is sent to the control means 10.

When the measurement signal of the temperature distribution of the object to be heated 21 is received from the control means 10, the vertical motor 602 and the horizontal motor 604 are controlled so that the visual field of the temperature measuring means 15 scans the area of the object to be heated 21. It is rotated and the region of the object to be heated 21 is scanned by the temperature measuring means 15, the temperature of the region of the object to be heated 21 is measured, and the temperature distribution of the object to be heated 21 is sent to the control means 10.

In step 1105 of the operation of the embodiment of the heating cooker of the present invention shown in FIG. 11, the object to be heated 2 is determined based on the difference between the initial temperature distribution and the current temperature distribution in the heating chamber 4.
It is determined whether the area 1 can be detected, and step 11
Even if it is determined that the area in which the difference between them is equal to or larger than the threshold value in 06 is the area of the object to be heated 21, the area of the object to be heated 21 at room temperature can be detected.

Conventionally, the area of the object to be heated 21 has been detected based on the output image of the heating chamber 4 from the image sensor. Figure 10
In the embodiment of the heating cooker of the present invention shown in FIG. 2, the temperature measuring means 15 such as an infrared sensor and the temperature sensor 16 are used to detect the area of the object to be heated 21, and the area to be heated is heated without using the image sensor. Since the area of the object 21 can be detected, the device parts and the device cost can be reduced.

Conventionally, the temperature distribution of the heating chamber 4 is measured by an infrared sensor, and the position of the object to be heated 21 is detected when the temperature shows a peak. Therefore, the area of the object to be heated 21 can be detected. However, if the object to be heated 21 is large, there is a problem that only the central portion of the object to be heated 21 can be heated. In the embodiment of the heating cooker of the present invention shown in FIG. 10, the difference between the temperature near the heating chamber 4 by the temperature sensor 16 and the temperature distribution of the heating chamber 4 by the temperature measuring means 15 is calculated to obtain the object to be heated 21. Area can be detected, and the portion where the electromagnetic waves are concentrated is moved by the control of the rotating antenna 6, so that the entire heated object 21 can be heated regardless of the size of the heated object 21.

Conventionally, the weight sensor 14 is installed in each of the 5 × 5 divided regions of the heating chamber 4, and a plurality of optical sensors are installed on the side wall of the heating chamber 4. In one embodiment of the heating cooker of the present invention shown in FIG. 10, one infrared sensor (temperature measuring means 15) and two motors (vertical motor 602, lateral motor 604) detect the area of the object to be heated 21. Therefore, the device parts and the device cost can be reduced.

In the embodiment of the heating cooker of the present invention shown in FIG. 10, since the detection is repeated during heating, even the object 21 to be heated having the same temperature as the heating chamber 4 which is difficult to detect by the infrared sensor. Object to be heated 2 that is heated during heating
One area can be detected.

In the embodiment of the heating cooker according to the present invention shown in FIG. 10, during heating, the temperature measuring means 15 moves the object 21 to be heated.
Since the temperature is measured only in the area, the measurement time of the temperature distribution of the object to be heated 21 can be shortened as compared with the case of measuring the temperature distribution of the entire heating chamber 4.

In the embodiment of the heating cooker of the present invention shown in FIG. 10, since the time for measuring the temperature distribution of the object to be heated 21 is short, the object to be heated 21 can be easily brought to the finish temperature. For example, when the temperature distribution of the entire heating chamber 4 is measured and the measurement time of the temperature distribution is long, the measured temperature of the object to be heated 21 during heating is 5
Assuming that the temperatures are 2 ° C., 58 ° C., and 64 ° C., if the finish temperature is 60 ° C., heating will be stopped when the object to be heated 21 reaches 64 ° C.

On the other hand, when only the region to be heated 21 is measured and the temperature distribution measurement time is short, the region to be heated 2 during heating is measured.
When the measurement temperature of No. 1 is 52 ° C., 55 ° C., 58 ° C., 61 ° C., the resolution becomes small and the heating can be stopped when the temperature of the object to be heated 21 reaches 61 ° C.

In step 1108 of the operation of the embodiment of the heating cooker of the present invention shown in FIG. 11, the temperature of the region of the article to be heated 21 is repeatedly measured by the temperature measuring means 15 during heating, and the average value is obtained. In comparison with the case where the temperature distribution of the entire heating chamber 4 is measured, the temperature measurement accuracy can be increased in the same measurement time.

In the embodiment of the heating cooker of the present invention shown in FIG. 10, since the temperature of the region of the object to be heated 21 is measured, the temperature reliability is higher than that of measuring the temperature at one location.

In an embodiment of the temperature measuring means 15 shown in FIG. 12, a light emitting means 607 such as a light emitting diode is attached to the temperature measuring section 17 as shown in FIG. 13 so that it is in the same direction as the sensing direction of the temperature measuring means 15. When the light emitting means 607 irradiates the temperature measurement area with light (visualization of the sensing area), the object to be heated 2 is heated during heating.
It is possible to confirm whether or not 1 is normally sensed.

In one embodiment of the heating cooker of the present invention shown in FIG. 10, there are four heating cookers as shown in FIG. 9 (a sectional view taken along the broken line 101 in the embodiment of the heating cooker of the present invention in FIG. 1). The weight sensors 14 (not shown in FIG. 10) are arranged near the corners of the bottom plate 5, and the four weight sensors 14 and the control means 10 are connected. The control means 10 subtracts the weight of the bottom plate 5 from the sum of the weights measured by the four weight sensors 14 when receiving the signal that the door sensor 12 has opened, and when the weight is zero, the control means 10 is placed in the heating chamber 4. It is determined that there is no object to be heated 21, and the temperature distribution of the heating chamber 4 measured by the temperature measuring means 15 at that time is stored in advance as a temperature distribution in the state where there is no object to be heated 21 in the heating chamber 4.

Therefore, in the operation of the embodiment of the heating cooker according to the present invention shown in FIG. 11, step 1103 is omitted, and the temperature distribution measured in step 1105 by the temperature measuring means 15 is the temperature distribution in the state where there is no object to be heated 21. , And if one of the values in each region is greater than or equal to a threshold value, the heating chamber 4
It is determined that the area of the object to be heated 21 located in is detectable. When all the values of each area are less than a certain threshold value, it is determined that the area of the object to be heated 21 in the heating chamber 4 cannot be detected.

In step 1106, the temperature distribution measured by the temperature measuring means 15 is subtracted from the temperature distribution in the absence of the object to be heated 21.
The area of the object to be heated 21 is detected by determining that 1 is the area.

When the above-described operation is performed, the area of the object to be heated 21 can be detected without depending on the variation in the temperature of each area. Therefore, as compared with the operation of the embodiment of the heating cooker of the present invention shown in FIG. Thus, even if the difference in temperature between the object to be heated 21 and the heating chamber 4 is smaller, the region of the object to be heated 21 can be detected, concentrated heating can be performed at an early stage, and the heating time can be shortened.

[0107]

In the past, the area of the object to be heated was detected based on the output image of the heating chamber from the image sensor. According to the cooking device of the present invention, the area of the object to be heated is detected by using the brightness measuring means such as the phototransistor or the photodiode. Since the signal from the lightness measuring means has a smaller capacity than that of the image, it can be processed even by the control means (microprocessor) having a low data acquisition performance or processing performance, so that the apparatus cost can be reduced.

Conventionally, the temperature distribution of the heating chamber is measured by an infrared sensor, and the position of the object to be heated is detected when the temperature shows a peak. Therefore, when the object to be heated is at room temperature or smaller than room temperature, heating is started. Sometimes the position of the heated object could not be detected.

Further, since the area of the object to be heated cannot be detected, there is a problem that only the central portion of the object to be heated can be heated when the object to be heated is large.

According to the heating cooker of the present invention, since the area of the object to be heated is detected based on the brightness, the area of the object to be heated can be detected even when the object to be heated is at room temperature or smaller than room temperature. Electromagnetic waves can be concentrated on the object to be heated from the start of heating,
The heating time can be shortened.

Further, since the area of the object to be heated is detected and the electromagnetic wave is concentrated in that area by controlling the rotating antenna,
The entire object to be heated can be heated regardless of the size of the object to be heated.

Conventionally, a weight sensor is installed in each of the 5 × 5 divided regions of the heating chamber, and a plurality of optical sensors are installed on the side wall of the heating chamber. According to the cooking device of the present invention, one infrared sensor (temperature measuring means), one phototransistor (brightness measuring means), and two motors can detect the area of the object to be heated, which reduces device cost. It can be reduced.

According to the cooking device of the present invention, since the temperature / brightness detecting means measures the temperature of only the region of the object to be heated during heating, compared with the case where the temperature distribution of the entire heating chamber is measured, The measurement time of the temperature distribution of the heated object can be shortened.

According to the heating cooker of the present invention, since the time for measuring the temperature distribution of the object to be heated is short, it is easy to bring the object to be heated to the finishing temperature. For example, if the temperature distribution of the entire heating chamber is measured and the measurement time of the temperature distribution is long, if the measured temperature of the object to be heated during heating rises to 52 ° C., 58 ° C., and 64 ° C., the finishing temperature of 60 ° C. In this case, the heating is stopped when the object to be heated reaches 64 ° C.

On the other hand, when only the area to be heated is measured and the temperature distribution measurement time is short, the resolution of the object to be heated during heating decreases to 52 ° C., 55 ° C., 58 ° C. and 61 ° C. The heating can be stopped when the temperature of the object to be heated reaches 61 ° C.

According to the heating cooker of the present invention, the temperature of the area of the object to be heated is repeatedly measured by the temperature / brightness detecting means during heating, and the average value is obtained. Therefore, the temperature distribution of the entire heating chamber is measured. Compared with the case, the temperature measurement accuracy can be increased in the same measurement time.

According to the cooking device of the present invention, the field of view of the brightness of the brightness measuring means is made smaller than the field of view of the temperature measurement of the temperature measuring means, and the area of the area to be heated within the field of view of the temperature measurement is reduced. The accuracy of the measured temperature of the object to be heated can be improved by obtaining the temperature of the object to be heated from both the ratio and the measured temperature in the area without the object to be heated.

According to the heating cooker of the present invention, since the temperature of the region of the object to be heated is measured, the reliability of the temperature is higher than that of measuring the temperature at one location.

According to the cooking device of the present invention, since the temperature / brightness detecting means and the light are arranged close to each other, the shadow of the object to be heated is less likely to be seen from the temperature / brightness detecting means. The area of the object can be measured with high accuracy.

According to the cooking device of the present invention, the temperature / brightness measuring portion of the temperature / brightness detecting means or the temperature measuring portion of the temperature measuring means is provided with a light emitting means such as a light emitting diode, and the temperature measuring means and the lightness measuring means are sensed. Since the light emitting means illuminates the temperature and brightness measurement area (visualization of the sensing area), the light emitting means illuminates the temperature and brightness measurement area. You can check.

Conventionally, the area of the object to be heated has been detected based on the output image of the heating chamber from the image sensor. According to the cooking device of the present invention, the area of the object to be heated is detected by using the brightness measuring means such as an infrared sensor and the temperature sensor, and the area of the object to be heated can be detected without using the image sensor. Therefore, the device parts and the device cost can be reduced.

Conventionally, the temperature distribution of the heating chamber is measured by an infrared sensor, and the position of the object to be heated is detected when the temperature shows a peak. When the heated object is large, there is a problem that only the central portion of the object to be heated can be heated. According to the heating cooker of the present invention, the area of the object to be heated can be detected by obtaining the difference between the temperature in the vicinity of the heating chamber by the temperature sensor and the temperature distribution in the heating chamber by the temperature measuring means, and by controlling the rotating antenna. Since the electromagnetic waves are concentrated in that region, the entire object to be heated can be heated regardless of the size of the object to be heated.

Conventionally, a weight sensor is provided in each of the 5 × 5 divided regions of the heating chamber, and a plurality of optical sensors are provided on the side wall of the heating chamber. According to the heating cooker of the present invention, the area of the object to be heated can be detected by one infrared sensor (temperature measuring means) and two motors, so that the device parts and the device cost can be reduced.

According to the cooking device of the present invention, since detection is repeated during heating, it is difficult to detect with an infrared sensor. Even an object to be heated having the same temperature as the heating chamber can detect that region during heating. You can

[Brief description of drawings]

FIG. 1 is an external view of an embodiment of a heating cooker according to the present invention.

FIG. 2 is a diagram showing a configuration of an embodiment of a heating cooker of the present invention.

FIG. 3 is a plan view showing an embodiment of a rotary antenna.

FIG. 4 is a perspective view showing a state in which a door of the heating cooker according to the embodiment of the present invention is opened.

FIG. 5 is a diagram showing an operation of one embodiment of the heating cooker of the present invention.

FIG. 6 is a perspective view showing an embodiment of temperature / brightness detecting means.

FIG. 7 is a perspective view showing an embodiment of temperature / brightness detecting means with light emitting means added to FIG.

FIG. 8 is a diagram showing a trajectory of a visual field center measured by a temperature / brightness detecting unit and a temperature measuring unit.

FIG. 9 is a cross-sectional view of a broken line portion of FIG. 1, which is an embodiment of the heating cooker of the present invention.

FIG. 10 is a diagram showing a configuration of an embodiment of a heating cooker according to the present invention.

FIG. 11 is a diagram showing an operation of the heating cooker according to the embodiment of the present invention.

FIG. 12 is a perspective view showing an embodiment of temperature measuring means.

FIG. 13 is a perspective view showing an embodiment of a temperature measuring means with a light emitting means attached to FIG.

[Explanation of symbols] 4 ... Heating room 6 ... Rotating antenna 8 ... Magnetron 15 ... Temperature measuring means 21 ... Object to be heated 600 ... Direction changing means 605 ... Temperature measuring means 606 ... Brightness measuring means 607 ... Light emitting means

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 6/72 H05B 6/72 A (72) Inventor Mitsuru Honma 502 Jinmachi, Tsuchiura-shi, Ibaraki Hiritsu Seisakusho Co., Ltd. In-lab (72) Inventor Sanou Maru Satoshi, Shinjyojiyo, 3-1, Kashiwa-shi, Chiba Pref. (72) Inventor Kiyoshi Ozawa, 3-1, Shinjuyoji, Kashiwa-shi, Chiba, F-term (Reference) 3K086 AA01 AA07 AA08 BA08 CA04 CA09 CB03 CB04 CB06 3K090 AA01 AA02 AB02 BA01 BB01 DA08 3L086 BB07 CB15 CB16 DA07 DA12 DA20

Claims (8)

[Claims] 1. A temperature measuring unit (605) for measuring the temperature of each region in the heating chamber (4) in a non-contact manner, and a brightness measuring unit (60) for measuring the brightness of each region in the heating chamber (4). 6
06), and direction changing means (6) for changing the directions of the visual fields of the temperature measuring means (605) and the brightness measuring means (606).
00) and the temperature measuring means (605) and the brightness measuring means (606) are arranged side by side so as to measure the same region. 2. A heating chamber (4) with a brightness measuring means (606).
The area of the object to be heated (21) inside is detected, and during the heating of the object to be heated (21), the field of view of the temperature measuring means (605) is directed to the area of the object to be heated (21), and The heating cooker according to claim 1, wherein the temperature of the heating object (21) is measured. 3. A magnetron (8) for generating electromagnetic waves
And a rotating antenna (6) that concentrates the electromagnetic waves and sends the electromagnetic waves to the heating chamber (4), and the area of the object to be heated (21) in the heating chamber (4) measured by the brightness measuring means (606). The heating cooker according to claim 1, wherein the rotating antenna (6) is controlled so as to concentrate the electromagnetic waves on the region of the object (21) to be heated. 4. The light emitting means (607) for emitting light to the region in the heating chamber (4) where the temperature is being measured, the temperature measuring means (605) being provided. Heating cooker. 5. A temperature measuring means (15) for measuring the temperature of each region in the heating chamber (4), and the temperature measuring means (15).
Direction changing means (600) for changing the direction of the visual field of the object, and detects the area of the object to be heated (21) based on the temperature in the heating chamber (4) measured by the temperature measuring means (15). During the heating of the object to be heated (21), the direction of the temperature measuring means (15) is changed by the direction changing means (600), and the area of the object to be heated (21) is scanned to obtain the object to be heated. A heating cooker characterized by measuring the temperature of (21). 6. A temperature measuring means (15) for measuring the temperature of each region in the heating chamber (4), a magnetron (8) for generating an electromagnetic wave, and a rotating antenna (6) for concentrating the electromagnetic wave. Detecting the area of the object to be heated (21) based on the temperature in the heating chamber (4) measured by the temperature measuring means (15), and controlling the rotation of the rotating antenna (6),
A heating cooker characterized in that a portion for concentrating the electromagnetic wave is moved within a region of the object to be heated (21). 7. A temperature measuring means (15) for measuring the temperature of each region in the heating chamber (4), and the temperature measuring means (15).
Direction changing means (600) for changing the direction of the field of view, and light emitting means (607) for emitting light to the region in the heating chamber (4) where the temperature measuring means (15) measures the temperature. A cooking device characterized by that. 8. The temperature of each region in the heating chamber (4) is measured by a temperature measuring means (15) during heating, and the heating target (21) is raised based on the rising temperature of the heating target (21). The heating cooker according to claim 5, wherein the region 21) is detected.