JP3044945B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device such as a microwave oven, and more particularly to an automatic cooking device for performing thawing cooking.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional heating cooker of this type places a frozen food 3 on a cooking dish 2 installed in a cooking chamber 1 and places it on an operation panel 4. The food weight is set by the food weight setting dial 5 and the cooking is started by pressing the cooking start button 6. The cooking time and the high-frequency output of the magnetron 7 are determined according to the food weight set by the setting dial 5, and the thawing cooking is started.
After the start of cooking, the high-frequency output is sequentially reduced along with the cooking time to carry out cooking (Japanese Utility Model Publication No. 3-30722).
No.).

[0003]

However, in the above configuration, both the cooking time and the high-frequency output at the start of cooking are set at the same time by the set weight of the frozen food, so that the control process is complicated, and However, there was a problem that it became complicated. In addition, since the cooking time and the high-frequency output at the start of cooking were both set at the same time by the set weight of the frozen food, especially when the surface temperature of the frozen food is different, the finished state of the thawing cooking is significantly different, and in some cases, Also, there are problems such as an incomplete finish such as thawing over.

[0004] The present invention solves the above-mentioned conventional problems. By setting a high-frequency output according to the surface temperature of frozen food, it is possible to finish cooking with a simple control process and to perform thawing cooking. The purpose is to provide a vessel.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a temperature detecting device for detecting a surface temperature in a cooking chamber.
Means, and a high-frequency output according to the output of the temperature detecting means.
And a controller for controlling the temperature of the cooking chamber.
Rotation about the detection window on the fixed wall
It is something that moves.

[0006]

According to configuration of the present invention, it is possible to detect the entire surface temperature of the frozen food in the thawing carried out in easy single configuration. Therefore, by using this method, thawing cooking in a good finished state can be performed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a partially cutaway front view of a heating cooker according to the present invention, and the same components as those in the conventional example are denoted by the same reference numerals. 8
Indicates a surface temperature detection unit including an infrared sensor for detecting the surface temperature of food. The frozen food 3 is placed on the cooking dish 2, and the cooking start button 6 is pressed to start cooking. FIG.
Shows the signal flow. When the cooking start button 6 is pressed, the control unit 9 reads the surface temperature of the food detected by the surface temperature detection unit 8 and calculates a high-frequency output. Based on the calculation result, the magnetron 7 is operated via the drive unit 10 to perform heating cooking. FIG. 3 shows the relationship between the surface temperature of the food and the high-frequency output according to the present invention. In the figure, the horizontal axis indicates the surface temperature of the food, and the vertical axis indicates the high frequency output. When the surface temperature of frozen food is -20 ° C or less, the maximum high-frequency output,
For example, cooking is performed at 600 W, and the high-frequency output is sequentially reduced with the rise of the surface temperature of the frozen food so that the cooking is performed. When the surface temperature of the food reaches −5 ° C., the cooking is completed. Was set as follows. As described above, since the high-frequency output at the time of cooking is changed according to the surface temperature of the frozen food, defects in the finish such as thawing over of the frozen food are eliminated, and a good quality is always obtained according to the surface temperature of the frozen food. Finish thawing cooking can be performed. Since the high-frequency output is calculated only based on the surface temperature of the frozen food, the control process is greatly simplified. In addition, when the surface temperature of the food is low, cooking is performed with a large high-frequency output, and the high-frequency output is sequentially reduced as the surface temperature increases.
Decompression cooking could be performed in a relatively short time regardless of the food weight.

Embodiment 2 It is generally said that a cooking device such as a microwave oven has large uneven heating. It is also said that high frequency power is concentrated when a part of the surface of the frozen food is abnormally heated. In the first embodiment of the present invention, since the high-frequency output is determined based on the surface temperature of the frozen food, it is necessary to accurately detect the entire surface temperature of the frozen food. Hereinafter, a method for detecting a surface temperature according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 4A shows a conventional food temperature detecting method using this kind of infrared sensor. When detecting the surface temperature of food with an infrared sensor of this type, the viewing angle 11 of the infrared sensor is narrowed in order to increase the detection temperature accuracy, and the viewing angle on the food surface is set to the same temperature within the viewing angle, for example. Is φ10 to φ2
It was necessary to be about 0 mm. Further, since it is necessary to detect the entire surface of the food, the infrared sensor 8 is swung and scanned over a wide range 12. For this reason, it was necessary to provide a large opening 14 in the ceiling surface 13 of the cooking chamber 1. Therefore, the high-frequency output supplied from the magnetron 7 to the cooking chamber 1 leaks to the infrared sensor 8 through the opening 14, and the infrared sensor malfunctions, or
During cooking, there was a problem that the surface temperature of the food could not be detected. In addition, for example, as shown in FIG. 4B, an opening window 15 of about 4 mm square and a grid 1 of about 1 mm width are formed in the opening 14.
In the case where a lattice-shaped high-frequency shield plate 17 composed of 6 is provided, it is necessary to swing the infrared sensor so that the viewing angle 11 of the infrared sensor just enters the opening window 15, and a highly accurate neck is required. Swing control was required. That is,
When the grating width 16 falls within the viewing angle 11 of the infrared sensor, the surface temperature of the grating width 16 is detected, which causes a malfunction. For this reason, the control of the swiveling scan of the infrared sensor becomes very complicated, and it has been very difficult to realize in practice. There is also a problem that the surface temperature of the food entering the shadow portion of the grid width 16 cannot be detected.

FIG. 5 shows the rotation operation of the temperature detecting means according to the present invention in detecting the surface temperature of food. In order to improve the detection accuracy of the food surface temperature, the food 3 placed on the cooking dish 2
The viewing angle 11 is narrowed down so that the detection range of the infrared sensor 18 on the surface of the above becomes about φ10 to φ20 mm as in the conventional case. Small detection window 1 that does not block the narrowed viewing angle 11
9, for example, a circular hole φ5 mm is provided on the wall surface of the cooking chamber 1, for example, the ceiling surface 13. In the figure, broken lines 18a and 18b are shown.
By rotating the infrared sensor 18 about the detection window 19 as a center of rotation and detecting the surface temperature of the food 3 as shown in FIG.
Can detect the temperature of the entire surface. The high frequency power supplied from the magnetron 7 to the cooking chamber 1 is about φ5
Since there was almost no leakage from the circular hole of mm, the infrared sensor did not malfunction. Furthermore, since the small detection window 19 made of a circular hole of about φ5 mm does not have the grid width 16 as shown in FIG. 4, there is no shadow portion where the infrared sensor cannot detect the temperature on the food surface, and the frozen food is Since the temperature of the entire surface can be accurately detected, a portion of the surface is not abnormally heated.

The present invention is not limited to the above embodiment. For example, the high-frequency output is changed as shown in FIG. 3, but is changed stepwise according to the surface temperature of the food.
This may be as shown in FIG. Further, the infrared sensor for detecting the surface temperature of the food is provided on the ceiling surface, but may be on the side wall surface of the cooking chamber as long as the surface temperature of the food can be detected.

As described in detail above, according to the present invention, high-frequency output is always controlled in accordance with the surface temperature of food to perform thawing cooking, so that thawing cooking with a good finish can be realized.

[0013]

As described above, according to the cooking device of the present invention,
For example, the temperature detection means is rotated around a single small detection window as a center of rotation to detect the surface temperature of the food, so that the surface temperature of the entire surface of the food can be accurately detected, that some of the food surface is heated to abnormal Do <br/> physician.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front sectional view of a cooking device according to an embodiment of the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a change in high-frequency output according to one embodiment of the present invention.

FIG. 4A is a diagram showing a detection method of a conventional infrared sensor. FIG. 4B is a diagram showing a grid-like high-frequency shield plate provided in an opening.

FIG. 5 is a diagram for explaining the operation of the infrared sensor of the present invention.

FIG. 6 is a partially cutaway front sectional view of a conventional cooking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooking room 3 Food 7 Magnetron (high frequency oscillator) 8 Infrared sensor (temperature detection means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-24125 (JP, A) JP-A-59-217421 (JP, A) Fully open Showa 60-135510 (JP, U) Really open Showa 57- 24908 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24C 7/02 330

Claims (2)

(57) [Claims] A temperature detecting means for detecting a surface temperature in a cooking chamber.
And a high-frequency output according to the output of the temperature detecting means.
And a controller for controlling the temperature of the cooking chamber.
Rotational movement using the detection window provided on the fixed wall as the center of rotation
Heating cooker which was formed by. 2. The method according to claim 1, wherein the size of the detection window is Φ5 mm or less.
The heating cooker according to claim 1 .