JPWO2016170734A1 - Cooker - Google Patents

Abstract

A cooking device of the present disclosure includes a microwave generation unit that generates a microwave, a heating chamber for storing an object to be heated, an infrared sensor installed in the heating chamber, and a scanning unit that scans the infrared sensor. And a control unit that controls the microwave generation unit based on the output of the infrared sensor. The infrared sensor acquires a plurality of temperature distributions by acquiring a temperature distribution every time a predetermined distance is scanned. Further, the control unit controls the microwave generation unit in accordance with the temperature distribution obtained by adding a plurality of temperature distributions.

Description

  The present disclosure relates to a heating cooker that heats an object to be heated.

  Conventionally, a heating cooker using an infrared sensor is used.

  A conventional cooking device includes a heating chamber, a high frequency generator, an infrared array sensor, and a control unit. The food or the object to be heated including the food and the container is stored in the heating chamber. The high frequency generator generates a high frequency for heating the object to be heated. The infrared array sensor detects temperatures at a plurality of locations within a viewing angle including an object to be heated by a plurality of infrared sensor elements arranged in a matrix. A control part controls heating of a to-be-heated material by controlling a high frequency generator (patent documents 1).

  Another conventional cooking device includes a microwave generator, an inverter, a heating chamber, and control means. The microwave generator generates microwaves. And an inverter supplies electric power required in order to generate a microwave to a microwave generation part. The heating chamber stores a load heated by microwaves. The control means controls the inverter 8 to vary the power of the microwave generator (Patent Document 2).

JP 2013-36635 A JP 2013-127327 A

  A cooking device of the present disclosure includes a microwave generation unit that generates a microwave, a heating chamber for storing an object to be heated, an infrared sensor installed in the heating chamber, and a scanning unit that scans the infrared sensor. And a control unit that controls the microwave generation unit based on the output of the infrared sensor. The infrared sensor acquires a plurality of temperature distributions by acquiring a temperature distribution every time a predetermined distance is scanned. Further, the control unit controls the microwave generation unit in accordance with the temperature distribution obtained by adding a plurality of temperature distributions acquired by the infrared sensor.

The figure which shows the heating cooker of Embodiment 1 of this indication. The figure which shows the scanning part of the heating cooker of Embodiment 1 of this indication. The figure which shows the scanning of the infrared sensor of the heating cooker of Embodiment 1 of this indication. The figure which shows the image produced | generated from the temperature distribution acquired with the infrared sensor of Embodiment 1 of this indication. The figure which shows the image produced | generated from the several temperature distribution acquired with the infrared sensor of Embodiment 1 of this indication. The figure which shows the scanning part of Embodiment 2 of this indication The figure which shows the scanning part of Embodiment 3 of this indication The figure which shows the pixel part scanned by the scanning part of Embodiment 3 of this indication.

  Prior to the description of the embodiment of the present disclosure, problems of the conventional cooking device described in Patent Document 1 and Patent Document 2 will be described.

  The cooking devices shown in Patent Document 1 and Patent Document 2 cannot accurately measure the temperature of the heated object when the size of the heated object is small. In addition, when the temperature of a part of the object to be heated is locally high, the temperature cannot be measured accurately.

  The cooking device of the present disclosure can accurately measure the temperature of the object to be heated even when the object to be heated is small or even when the temperature of a part of the object to be heated is locally high.

  Next, the heating cooker which concerns on embodiment is demonstrated using drawing. In addition, in each drawing, about the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted. In addition, each component in each embodiment may be arbitrarily combined within a consistent range. Furthermore, another embodiment realized by excluding some of the constituent elements may be an embodiment of the present disclosure. Modifications obtained by applying various modifications conceivable by those skilled in the art to the embodiments described below without departing from the gist of the present disclosure, that is, the meanings indicated in the claims. included.

(Embodiment 1)
Below, the heating cooker 1 of Embodiment 1 is demonstrated, using drawing.

  FIG. 1 shows a heating cooker 1 according to Embodiment 1, and FIG.

  The heating cooker 1 according to Embodiment 1 includes a microwave generation unit 2, a heating chamber 4, an infrared sensor 5, a scanning unit 6, a control unit 7, and an inverter 8. The microwave generator 2 generates a microwave. The heating chamber 4 accommodates the microwave generator 2 and the object to be heated 3 such as food or cloth. The infrared sensor 5 is installed on the inner wall of the heating chamber 4. The scanning unit 6 scans the infrared sensor 5. The control unit 7 controls the microwave generation unit 2. The inverter 8 supplies power to the microwave generation unit 2.

  The microwave generator 2 is supplied with electric power from the inverter 8. The microwave generator 2 generates a 2450 MHz microwave. The wavelength of the microwave generated by the microwave generation unit 2 is not limited to 2450 MHz, and may be another wavelength.

  The microwave is introduced into the heating chamber 4 through an antenna (not shown). The object to be heated 3 is rotated by a turntable (not shown) provided in the heating chamber 4 so that the object to be heated 3 is evenly heated. The present embodiment is configured as described above. Note that the antenna is not limited to this configuration, and the antenna may be rotated without providing a turntable.

  The heating chamber 4 is made of a metal such as aluminum in order to reduce heating loss. An infrared sensor 5 is installed on the inner wall of the heating chamber 4 to detect the temperature of the object to be heated 3 in the heating chamber 4.

  The control unit 7 is connected to the microwave generation unit 2, the inverter 8, and the infrared sensor 5. The person who operates the cooking device 1 will be described below as a “user”. The inverter 8 operates according to the user's operation. The inverter 8 supplies power to the microwave generation unit 2, and the microwave generation unit 2 generates microwaves. Based on the output of the infrared sensor 5, the control unit 7 controls the microwave generation unit 2 so that the article 3 to be heated is heated evenly. The cooking device 1 is controlled so that the article 3 to be heated can be heated as input by the user to the cooking device 1.

  The infrared sensor 5 has a thermal infrared detection unit in which a temperature sensing unit is embedded. A thermoelectric conversion unit is used as the temperature sensing unit. This thermoelectric conversion part is comprised by the thermopile which converts the thermal energy by the infrared rays radiated | emitted from the to-be-heated material 3 into an electrical energy. The infrared sensor 5 includes an infrared detection element 100 (non-contact infrared detection element). The infrared detecting element 100 has a two-dimensional array shape in which a × b pixel portions 9 are formed in a two-dimensional array of a rows and b columns on the surface of a semiconductor substrate. A and b are integers of 2 or more.

  The pixel unit 9 includes a temperature sensing unit and a MOS (Metal-Oxide Semiconductor) transistor for taking out an output voltage of the temperature sensing unit. The pixel portion 9 in the first embodiment is configured as an 8 × 8 pixel portion.

  Note that the pixel units 9 are arranged in the direction of the short axis of the pixel unit 9, and hereinafter, the direction in which the pixel units 9 are arranged is referred to as a row direction or a column direction. Then, the row direction of the pixel unit 9 is described as an X-axis direction (first direction), and the column direction is described as a Y-axis direction (second direction).

  The scanning unit 6 is configured by a motor or the like, and rotates the infrared sensor around the rotation axis 10 to scan the infrared sensor 5 in a direction connecting the ceiling 11 and the bottom surface 12 of the heating chamber 4.

  Next, how the scanning unit 6 scans the infrared sensor 5 and obtains the temperature distribution will be described. FIG. 3 shows the detection region 13 of the infrared sensor 5 (shown in FIG. 1) before and after scanning. FIG. 4A shows a generated image generated based on the temperature distribution. FIG. 4B shows a generated image generated based on a plurality of temperature distributions acquired by scanning an infrared sensor. In FIG. 3, the detection area 13 before scanning is indicated by a solid line, and the detection area 14 after scanning is indicated by a dotted line. In FIG. 4A and FIG. 4B, the dark part shows the measurement image 15 in which the measurement is completed, and the white part shows the unmeasured image 16 in which the measurement is not completed. Here, the length of one side of the pixel portion 9 is described as c.

  First, the temperature distribution of the detection region 13 of the infrared sensor 5 is acquired. Next, the infrared sensor 5 is scanned by the length c / 2 in the X-axis direction by the scanning unit 6, and the temperature distribution of the detection region 14 after scanning is acquired. Next, the temperature distribution of the detection region 14 after scanning the information between the pixels of the temperature distribution acquired first is acquired. The process of acquiring the temperature distribution by scanning the infrared sensor 5 by the length c / 2 is repeated, and the infrared sensor 5 acquires a temperature distribution every time it scans a predetermined distance, and acquires a plurality of temperature distributions. . The temperature distribution after complementation is acquired by adding the temperature distributions so as to complement the information between the pixels of the plurality of temperature distributions acquired in this way.

  As shown in FIG. 4A and FIG. 4B, the temperature distribution of the first embodiment is compared with the case where the temperature distribution is acquired by the conventional method using only the temperature distribution acquired by scanning without supplementing the temperature distribution. The measured image is doubled in the temperature distribution obtained by the method. Compared to before the temperature distribution is complemented, the number of pixels for which measurement has been completed is doubled, so the resolution is doubled. In this way, by scanning the infrared sensor 5 and acquiring the post-complement temperature distribution, a more detailed temperature distribution can be acquired.

  Here, a problem when the object to be heated 3 is smaller than an area that can be detected by one pixel unit 9 will be described.

  The temperature data obtained in one pixel unit 9 is temperature data obtained by averaging the temperature of the object to be heated 3 and the temperature of the object other than the object to be heated 3 such as the background. Therefore, the temperature of the object to be heated 3 is accurately determined. It cannot be detected.

  However, in the heating cooker 1, the control unit 7 controls the microwave generation unit 2 according to the high-resolution temperature distribution. Even when the object to be heated 3 is small, the temperature of the object to be heated 3 is not averaged by the temperature of the background other than the object to be heated 3. Therefore, the heating cooker 1 can detect the temperature of the article to be heated 3 with high accuracy. The accuracy of heating control in the heating cooker 1 can be improved.

  Even when the object to be heated 3 is sufficiently large, the temperature of a part of the object to be heated 3 may be different from the temperature of the other part. However, in the heating cooker 1, the microwave generation unit 2 is controlled according to the high-resolution temperature distribution, so that the heating control can be performed with high accuracy.

  In the present embodiment, the infrared sensor 5 is scanned by the length c / 2, but the distance to scan the infrared sensor 5 is not limited to this. For example, the distance for scanning the infrared sensor 5 may be set to another distance such as c / 4. When the scanning distance of the infrared sensor 5 is set to c / 4, the resolution of the post-complementation temperature distribution is quadrupled compared to the case where the temperature distribution is not supplemented. Therefore, the temperature of the article to be heated 3 can be detected more accurately.

  In this way, if the scanning distance of the infrared sensor 5 is shortened, the resolution of the post-complementation temperature distribution can be improved only by shortening the distance. When the scanning distance of the infrared sensor 5 is set to c / n, a post-complementation temperature distribution having a resolution n times that of the non-complementary temperature distribution can be acquired. The distance for scanning the infrared sensor 5 can be appropriately set according to the use conditions of the heating cooker 1.

(Embodiment 2)
The heating cooker of Embodiment 2 is demonstrated using drawing. FIG. 5 illustrates the scanning unit 6 according to the second embodiment of the present disclosure.

  Similarly to the first embodiment, the heating cooker according to the second embodiment includes a microwave generation unit 2, a heating chamber 4, an infrared sensor 5, a scanning unit 6, a control unit 7, and an inverter 8. Have. In addition, the same code | symbol is attached | subjected about the structure similar to Embodiment 1, and detailed description is abbreviate | omitted.

  As shown in FIG. 5, the cooking device of the second embodiment scans the infrared sensor 5 (shown in FIG. 1) in the direction of the long axis 23 (the longest part of the pixel unit 22) of the pixel unit 22. By scanning the infrared sensor 5 in the direction of the long axis 23, for example, the infrared sensor 5 is scanned by d / 2 that is ½ of the length d of the long axis 23 of the pixel unit 22. When the temperature distribution is acquired by adding the temperature distributions, it is possible to acquire a temperature distribution with a resolution four times that before complementing the temperature distribution. In this way, by scanning in the direction of the long axis 23 of the pixel unit 22, a higher-resolution temperature distribution can be acquired, and thus the accuracy of heating control of the heating cooker 1 can be improved. Even if the scanning direction of the infrared sensor 5 is not the major axis 23 direction of the pixel unit 22, the effect of improving the resolution can be obtained by scanning in a direction other than the X-axis direction and the Y-axis direction of the infrared sensor 5. Can do.

  That is, when the infrared sensor 5 is scanned in a direction different from the direction of the short axis of the infrared detection element 100, the resolution can be further improved.

(Embodiment 3)
The heating cooker of Embodiment 3 is demonstrated using drawing. FIG. 6 illustrates the scanning unit 6 according to the third embodiment of the present disclosure, and FIG. 7 illustrates the pixel unit 32 scanned by the scanning unit 6.

  Similarly to the first embodiment, the heating cooker according to the third embodiment includes a microwave generation unit 2, a heating chamber 4, an infrared sensor 5, a scanning unit 6, a control unit 7, and an inverter 8. Have. In addition, the same code | symbol is attached | subjected about the structure similar to Embodiment 1, and detailed description is abbreviate | omitted.

  The heating cooker according to the third embodiment includes a row 33 that is a first row and a row 34 that is a second row in which a plurality of pixel portions 32 are arranged. The position of the pixel 35 at one end of the row 33 and the position of the pixel 36 at one end of the row 34 in the X-axis direction are different.

  That is, the pixel unit 32 is arranged so that the infrared detection element 100 is stepped. In the following description, the pixel 35 and the pixel 36 are described as being shifted by c / 4. In addition, you may change suitably how the pixel 35 and the pixel 36 shift | deviate according to the use conditions of a heating cooker.

  In the heating cooker according to the third embodiment, the infrared sensor 5 is scanned in the Y-axis direction of the pixel unit 32 arranged in a staircase pattern. As shown in FIG. 7, the pixel 35 and the second pixel 36 are arranged so as to be shifted in the X-axis direction. Since the pixel 35 and the pixel 36 are shifted, when a high-resolution temperature distribution is acquired by adding a plurality of temperature distributions, the resolution in the X-axis direction can be improved as compared with the first embodiment. In the third embodiment, since the infrared detection element 100 is arranged so that the pixel 35 and the pixel 36 are shifted by c / 4 in the X-axis direction, the resolution in the X-axis direction can be quadrupled. Thereby, the precision of the heating control of the heating cooker can be improved.

  In addition, when the high-resolution temperature distribution is acquired, the resolution is lowered in a portion where the temperature distribution is not added, and therefore, the infrared sensor 5 is scanned so that the object to be heated 3 fits in the region where the temperature distribution is added. There is a need. Here, in the arrangement method of the pixel unit 32 of the third embodiment, the area where the resolution is low is narrower than that of the second embodiment, and therefore, the distance for scanning the infrared sensor 5 is shortened. For this reason, a high-resolution temperature distribution can be acquired in a short time, and the followability with respect to the temperature change of the to-be-heated material 3 improves.

  That is, the cooking device of the present disclosure includes a microwave generation unit 2 that generates microwaves, a heating chamber 4 for storing an object 3 to be heated, an infrared sensor 5 installed inside the heating chamber 4, A scanning unit 6 that scans the infrared sensor 5 and a control unit 7 that controls the microwave generation unit 2 based on the output of the infrared sensor 5 are provided. The infrared sensor 5 acquires a plurality of temperature distributions by acquiring the temperature distribution every time the predetermined distance is scanned. Furthermore, the control unit 7 controls the microwave generation unit 2 in accordance with the temperature distribution obtained by adding a plurality of temperature distributions.

  The cooking device according to the present disclosure can reduce uneven heating and heat the object to be heated more evenly.

  The cooking device of the present disclosure can heat the object to be heated so as to be more uniform regardless of the size of the temperature sensor object to be heated. Therefore, it is useful for cooking appliances such as microwave ovens for general household use and business use.

DESCRIPTION OF SYMBOLS 1 Heating cooker 2 Microwave generation part 3 To-be-heated object 4 Heating chamber 5 Infrared sensor 6 Scanning part 7 Control part 8 Inverter 9, 22, 32 Pixel part 10 Rotating shaft 11 Ceiling 12 Bottom face 13 Detection area 14 Detection area 15 Measurement image 16 Unmeasured image 23 Long axis 33, 34 rows 35, 36 pixels 100 Infrared detector

Claims (5)

A microwave generator for generating microwaves;
A heating chamber for storing an object to be heated;
An infrared sensor installed inside the heating chamber;
A scanning section for scanning the infrared sensor;
A control unit for controlling the microwave generation unit based on the output of the infrared sensor;
With
The infrared sensor acquires a plurality of temperature distributions by acquiring a temperature distribution every time a predetermined distance is scanned,
The control unit is a heating cooker that controls the microwave generation unit according to a temperature distribution obtained by adding the plurality of temperature distributions. The infrared sensor has an infrared detection element, and the infrared detection element has a two-dimensional array of a rows and b columns composed of a × b pixel units (a and b are integers of 2 or more),
The cooking device according to claim 1.   The cooking device according to claim 2, wherein the infrared sensor is scanned in a direction different from a direction of a short axis of the infrared detection element. The infrared detection element has a plurality of pixel portions arranged in a first row extending in a first direction and a plurality of pixel portions arranged in a second row extending in the first direction. And
Positions of end portions in the first direction of the plurality of pixel portions arranged in the first row and positions of end portions in the first direction of the plurality of pixel portions arranged in the second row The cooking device according to claim 2, wherein the different in the first direction.   The cooking device according to claim 4, wherein the infrared sensor is scanned in a second direction orthogonal to the first direction.