JPH06101846A - Heating cooker - Google Patents

Abstract

PURPOSE:To provide a heating cooker by which execution of defreezing cooking of a frozen food can be carried out in an excellent finishing state, in a heating cooker, such as a microwave oven. CONSTITUTION:A heating cooker comprises a cooking chamber 1 to accommodated a food 3, a temperature detecting means 8 to detect the surface temperature of the accommodated food, a high frequency oscillator 7 to perform high frequency heating of the accommodated food, and a controller to control a high frequency output. A high frequency output is controlled according to temperature detected by the temperature detecting means.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a conventional cooking device of this type, as shown in FIG. 6, a frozen food 3 is placed on a cooking plate 2 for cooking installed in a cooking chamber 1 and is placed on an operation panel 4. The food weight is set with the food weight setting dial 5, and the cooking start button 6 is pressed to carry out cooking. 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 start the thawing cooking,
After the start of cooking, the high frequency output was sequentially reduced with the cooking time to perform cooking (actual fair 3-30722).
Issue).

[0003]

However, in the above-described structure, both the cooking time and the high frequency output at the start of cooking are set at the same time depending on the set weight of the frozen food, so that the control process is complicated and The problem was that it would be complicated. Also, both the cooking time and the high-frequency output at the start of cooking were set at the same time depending on the set weight of the frozen food. There was also a problem such as a defective finished state such as defrosting.

The present invention solves the above-mentioned problems of the prior art. By setting a high-frequency output according to the surface temperature of frozen foods, it is possible to perform defrosting cooking with good finish by a simple control process. The purpose is to provide a vessel.

[0005]

In order to solve the above-mentioned problems, in the first aspect of the present invention, a cooking chamber for accommodating foods, a temperature detecting means for detecting the surface temperature of the foods accommodated therein, and a temperature detecting means for accommodating the foods. The high-frequency oscillator heats the food at a high frequency, and the controller controls the high-frequency output. The high-frequency output is controlled by the surface temperature detected by the temperature detecting means.

In the second aspect of the present invention, the temperature detecting means is rotated about a detection window provided on the wall surface of the cooking chamber as a center of rotation so that even a part of the surface of the food is not thawed. However, the entire surface of the stored food can be detected evenly during thawing and cooking.

[0007]

According to the first aspect of the present invention, the high frequency output is determined only by the surface temperature of the frozen food, the thawing cooking is started, and the high frequency output is sequentially decreased as the surface temperature of the frozen food rises. Controlling simplifies the control process. Further, since the high frequency output is controlled by the surface temperature of the frozen food, a good finished state of thawing and cooking can be obtained.

Further, according to the second structure of the present invention, it is possible to detect the total surface temperature of the frozen food during thawing and cooking with a simple structure. Therefore, by using this method, it is possible to carry out thawing cooking in a good finished state.

[0009]

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, in which the same components as in the conventional example are designated by the same reference numerals. Reference numeral 8 denotes a surface temperature detecting section 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. 2 shows a 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 this calculation result, the magnetron 7 is operated via the drive unit 10 to carry out heating and cooking.
FIG. 3 shows the relationship between the surface temperature and the high frequency output of the food according to the present invention. In the figure, the horizontal axis shows the surface temperature of the food and the vertical axis shows the high frequency output. When the surface temperature of the frozen food is -20 ° C or lower, the cooking is performed at the maximum high frequency output, for example, 600 W, and the high frequency output is sequentially decreased as the surface temperature of the frozen food increases, and the cooking is set to be performed. The cooking was set to end when the surface temperature of the food reached -5 ° C. In this way, since the high-frequency output at the time of cooking is changed depending on the surface temperature of the frozen food, there is no finish defect such as defrosting of the frozen food, and depending on the surface temperature of the frozen food, it is always good. Finished thawing cooking can be performed. Since the high frequency output is calculated only by the surface temperature of the frozen food, the control process is greatly simplified. In addition, when the surface temperature of food is low, cooking is performed with a large high-frequency output, and the high-frequency output is sequentially reduced as the surface temperature rises.Thus, thawing cooking can be performed in a relatively short time regardless of the weight of the food. did it.

(Embodiment 2) Generally, it is said that a heating cooker such as a microwave oven has large heating unevenness. Also, if a portion of the surface of frozen food is abnormally heated, high frequency power
Are said to be concentrated. In the first embodiment of the present invention, since the high frequency output is determined by the surface temperature of the frozen food, it is necessary to accurately detect the total surface temperature of the frozen food. A surface temperature detecting method according to a second embodiment of the present invention will be described below with reference to the drawings. A conventional food temperature detection method using this type of infrared sensor is shown in FIG. When detecting the surface temperature of food with this type of infrared sensor, the viewing angle 11 of the infrared sensor is narrowed down in order to improve the detection temperature accuracy so that the inside of the viewing angle has the same temperature, for example, the viewing angle on the food surface. Had to be about φ10 to φ20 mm. Also, because it is necessary to detect the entire surface of food,
The infrared sensor 8 was swung over a wide range 12. Therefore, it is necessary to provide a large opening 14 on 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 the surface temperature of food cannot be detected during cooking. There was such a problem. Further, when the opening 14 is provided with a grid-shaped high-frequency shield plate 17 composed of an opening window 15 of about 4 mm □ and a grid 16 of about 1 mm width, as shown in FIG. The infrared sensor needs to be swung so that the viewing angle 11 of the infrared sensor is exactly within the opening window 15, and highly accurate swing control is required. That is, the viewing angle of the infrared sensor 11
If the lattice width 16 is inside, it means that the surface temperature of the lattice width 16 is detected, which causes a malfunction. For this reason,
Since the control of the swinging scan of the infrared sensor becomes very complicated, it was very difficult to realize in practice. In addition, there is a problem that the surface temperature of the food that enters the shaded area of the grid width 16 cannot be detected.

FIG. 5 shows the rotating operation of the temperature detecting means according to the present invention in detecting the surface temperature of food. Foods 3 placed on the cooking plate 2 to increase the detection accuracy of the food surface temperature
The viewing angle 11 is narrowed so that the detection range of the infrared sensor 18 on the surface of is about 10 to 20 mm as in the conventional case. A small detection window 1 that does not block this 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
As shown in FIG. 3, the infrared sensor 18 is rotated about the detection window 19 to detect the surface temperature of the food 3, and the food 3 is detected through a single small detection window 19.
It is possible to detect the temperature of the entire surface of. Further, the high frequency power supplied from the magnetron 7 to the cooking chamber 1 is about φ5.
The infrared sensor did not malfunction because it hardly leaked from the circular hole of mm. Furthermore, since the small detection window 19 consisting of a circular hole of about φ5 mm does not have the grid width 16 as shown in FIG. 4, there is no shadow part where the infrared sensor cannot detect the temperature on the food surface, and the frozen food Since the temperature of the entire surface can be detected accurately, no part of the surface is 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 the high frequency output is changed stepwise according to the surface temperature of the food,
It may be configured as shown in FIG. Further, the infrared sensor for detecting the surface temperature of the food is provided on the ceiling surface, but it may be 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, the high-frequency output is always controlled according to the surface temperature of the food to perform the thawing cooking, so that the thawing cooking with a good finish can be realized.

[0015]

As described above, according to the cooking device of the present invention, the following effects can be obtained.

(1) Since the high frequency output is controlled by the surface temperature of the frozen food, the control process is simplified.

(2) Since the high frequency output is changed depending on the surface temperature of the frozen food, thawing cooking with a good finish can be carried out in a short time regardless of the weight of the food.

(3) Since the infrared sensor is rotated around the single small detection window as the center of rotation to detect the surface temperature of the food, there is no malfunction of the infrared sensor due to the high frequency output.

(4) Since the infrared sensor is rotated around the single small detection window as the rotation center to detect the surface temperature of the food, the surface temperature of the entire surface of the food can be accurately detected, and the frozen food can be detected. There is no abnormal heating of part of the surface.

[Brief description of drawings]

FIG. 1 is a partially cutaway front sectional view of a heating cooker 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 changes in high frequency output according to an embodiment of the present invention.

FIG. 4A is a diagram showing a conventional infrared sensor detection method. FIG. 4B is a diagram showing a grid-shaped 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]

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

Claims (2)

[Claims] 1. A cooking chamber for storing food, a temperature detecting means for detecting a surface temperature of the stored food, a high frequency oscillator for heating the stored food by high frequency, and a controller for controlling high frequency output. A heating cooker in which a high frequency output is controlled according to the surface temperature detected by the temperature detecting means. 2. The heating cooker according to claim 1, wherein the temperature detecting means rotates about a detection window provided on a wall surface of the cooking chamber as a rotation center to detect the surface temperature of the stored food.