JPH10259918A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always realize a constant finishing temperature by detecting the weight of a food in a heating chamber to drive heating means individually until the finishing temperature is detected when the weight of the food reaches a specified value or until specified temperature higher than the set temperature is detected when it exceeds the specified value. SOLUTION: When heating is started by a control section 90 operating an operation panel 34 to operate a microwave oven 100, the weight of a food in a cavity is detected by a weight sensor 501 to compare a detected weight W with previously stored specified weight W1 -W3 (W1 <W2 <W3 ). A magnetron 22 or a heater 80 is driven until a detected temperature T of the food reaches a set temperature (apparent finishing temperature) T1 previously stored corresponding to the specified weight W1 when W<=W1 or until a set temperature T2 (T1 <=T2 ) is reached when W1 <W<=W2 . Thereafter, when the detected temperature T reaches a finishing temperature, the control section 90 stops the magnetron 22 to end heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooking device,
In particular, the present invention relates to a heating cooker that performs heating while detecting the temperature of food in a cavity (heating chamber) with an infrared sensor.

[0002]

2. Description of the Related Art Some conventional microwave ovens are provided with an infrared sensor. During cooking, the infrared sensor detects infrared radiation emitted from the food placed on the turntable in the cavity, and detects the temperature of the food based on the detected infrared. Then, it is monitored whether or not the food has reached the finished temperature.

[0003]

However, in a microwave oven in which an infrared sensor is installed on the side of the cavity so as to catch infrared rays emitted from food obliquely from above, a cup containing milk is required. If more than one wine or sake is placed on the turntable,
Irregularities easily occur in the infrared light detected by the infrared sensor. For example, if a distorted object with a distorted shape and a height is placed, the turntable will rotate and the detected infrared light will be the constricted part or the lower part containing sake. As a result, large detection unevenness occurs.

[0004] Even in a microwave oven in which an infrared sensor is provided above a cavity, as described above,
If the food is not evenly placed on the turntable, detection unevenness occurs.

[0005] Further, when a plurality of objects are heated, heating unevenness is more likely to occur and heating is less likely when one object is heated. For example, the state of receiving microwaves emitted from the magnetron is different between when a single box is heated and when a plurality of boxes are heated, and when a plurality of boxes are heated. 1, uneven heating is more likely to occur than when a single item is heated, and it is difficult to heat.

Therefore, even when the same finishing temperature is set, the relationship between the field of view of the infrared sensor and the position of the food to be heated differs depending on the number and quantity of the food, so that unevenness in temperature detection occurs, Since the relationship with the position of the food to be heated is different, heating unevenness occurs and the temperature distribution changes, so that there is a problem that the actual finishing temperature differs depending on the number and amount of the food.

The present invention has been made to solve the above problems, and provides a cooking device capable of realizing a constant finishing temperature irrespective of the number and weight of foods to be heated. The purpose is to do.

[0008]

According to a first aspect of the present invention, there is provided a heating cooker comprising: a heating chamber for storing food; heating means for heating the food in the heating chamber; and a weight for detecting the weight of the food in the heating chamber. A detector, an infrared detector for detecting infrared radiation emitted from the food in the heating chamber, and a heating unit, which detects the temperature of the food based on the infrared radiation emitted from the food detected by the infrared detector. A control unit, wherein the control unit, when the food has a predetermined weight, drives the heating unit until a set finishing temperature is detected, and the food has a weight equal to or more than the predetermined weight In this case, the heating unit is driven until a predetermined temperature higher than the set finishing temperature is detected.

A heating cooker according to a second aspect of the present invention is the heating cooker according to the first aspect, further comprising a display unit for displaying a finished temperature irrespective of the predetermined temperature during heating by the heating means. .

[0010] According to a third aspect of the present invention, in the cooking device of the first or second aspect, the infrared detector is disposed so as to catch infrared rays emitted from the food obliquely from above.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 1 is a perspective view of a microwave oven 100 according to an embodiment of the present invention. FIG. 2 is a simplified cross-sectional view showing the internal structure of microwave oven 100 shown in FIG. Referring to FIG. 1 and FIG.
The infrared sensor 1 is disposed on the side of the cavity (heating chamber) 17, that is, so as to catch the infrared rays 25 radiated from the food 31 from obliquely above. The magnetron 22 supplies a microwave into the cavity 17. Below the magnetron 22, a high-voltage transformer 33 is arranged. Above the cavity 17, a heater 80
Is arranged. By a key input on the operation panel 34, a cooking heating course is set. Cooling fan 35
Cools the peripheral devices (including the infrared sensor 1) whose temperature has increased due to the heat of the magnetron 22, the heater 80, or the cavity 17. A door 15 is attached to the front of the cavity 17. Then, a control unit (microcomputer) 90 that controls these devices comprehensively includes:
It is provided on the back of the operation panel 34. At the bottom of the cavity 17, a turntable 18 for placing food is rotatably provided. Cavity 17
A weight sensor 501 connected to the rotation shaft of the turntable 18 and a turntable motor 505 for rotating the turntable 18 are arranged below the bottom surface of the turntable 18. The weight sensor 501 is for detecting the weight of the food 31 placed on the turntable 18.

FIG. 3 is a block diagram showing a main electrical configuration of the microwave oven 100 shown in FIGS.
Referring to FIG. 3, microwave oven 100 includes infrared sensor 1
, Turntable motor 505 and magnetron 22
, Operation panel 34, heater 80, control unit (microcomputer) 90, and weight sensor 501.

FIG. 4 is a flowchart for explaining the operation of the microwave oven 100 shown in FIGS. With reference to FIGS. 1 to 4, the control unit 90 starts heating by a key input on the operation panel 34, and in step S 401, the cavity 17
When the food 31 is placed on the turntable 18 in the
The weight W of the food 31 is detected by the weight sensor 501. Then, the control unit 90 controls the weight of the food 31 detected by the weight sensor 501 (hereinafter, referred to as the detected weight of the food 31).
W and predetermined weights W ₁ , W ₂ , W ₃ stored in advance.
(W ₁ <W ₂ <W ₃ ).

If the detected weight W of the food 31 is W ≦ W₁So
If so, the control unit 90 detects the food 31 in S402.
The temperature T is equal to a predetermined weight W₁Is stored in advance corresponding to
Set temperature (apparent finish temperature) T₁Until
Food 31 by magnetron 22 or heater 80
Heat. If the detected weight W is W₁<W ≦ W_TwoIf
In S403, the control unit 90 determines the detected temperature of the food 31.
The degree T is a predetermined weight W _TwoIs stored in advance corresponding to
Set temperature (apparent finish temperature) T_Two(T₁≤T_Two)
Till the magnetron 22 or heater 80
Heat the food.

If the detected weight W satisfies W ₂ <W ≦ W ₃ , in S404, the control unit 90 determines that the detected temperature T of the food is stored in advance corresponding to the predetermined weight W _3. The food is heated by the magnetron 22 or the heater 80 until the set temperature (apparent finished temperature) T ₃ (T ₂ ≦ T ₃ ) is reached. That is, as the weight of the food 31 increases, the control unit 90 controls the food 31 until a higher temperature is detected.
Keep heating.

Here, the detected temperature T of the food 31 detected by the control unit 90 is the temperature of the food 31 detected by the infrared sensor 1.
Is the temperature detected by the control unit 90 based on the infrared rays 25 radiated from the. In S405, the control unit 90 detects the temperature, and in S406, determines whether the temperature detected in S405 has reached the set temperature. If the temperature detected in S406 has reached the finishing temperature, the controller 90
Stops the magnetron 22 and ends the heating. S
If the temperature detected in 406 has not reached the set temperature (apparent finished temperature), S405, until the temperature of the food 31 reaches the set temperature (apparent finished temperature).
Step S406 is repeated.

For example, in the case of warming sake or milk, an appropriate heating temperature is stored in advance as a set temperature according to the number of bottles and the number of cups, and based on the weight W detected by the weight sensor 501, And the number of cups are estimated, and heating is performed at a set temperature corresponding to the number or number of cups.

That is, in the case of a heating course for warming a bottle of sake, for example, the predetermined weight W ₁ is the weight when the number of bottles is one, and the predetermined weight W ₂ is two when the bottle is sharp. weight in the case of a predetermined weight W ₃ being is set as that the weight of the case number of Tokkuri is three. As another example, if the heating course to warm cups containing the milk, the predetermined weight W ₁ is the weight of the case cups number of cups of a cup, a predetermined weight W ₂ is goblet number of cup 2
Weight in the case of cup, predetermined weight W ₃ being cup number of cups is set so that the weight in the case of three cups.

Table 1 shows the microwave oven 10 shown in FIGS.
5 shows an example of an automatic menu at 0 and a table of measured temperature values when heating is performed in each of the automatic menus.

[0021]

[Table 1]

Referring to Table 1, examples are shown for two types of automatic menus, "Sake no Kan" and "Hot Milk". That is, for each automatic menu, the set temperature (apparent finish temperature) corresponding to the weight set in advance in the control unit 90 of the microwave oven 100, and the actual amount of alcohol or milk when heating is performed at the set temperature. For comparison, and for comparison, the actual finishing temperature when heating is performed in a conventional microwave oven that does not change the set temperature in accordance with the weight. Here, the actual finishing temperature is a temperature measured by stirring after heating.

First, the case of "Sake no Kan" will be described. Referring to Table 1, when microwave sensor 100 detects the weight (approximately 592 g or less in this example) of one bottle containing sake by weight sensor 501, detection temperature detected by control unit 90. Is heated to 45 ° C. Also, when the weight of two bottles containing sake is detected,
Heating is performed until the temperature detected by control unit 90 reaches 60 ° C. Further, when the weight of three bottles containing the sake is detected, heating is performed until the detected temperature detected by the control unit 90 becomes 70 ° C. When the weight of four bottles containing the sake is detected, the control unit 90
The heating is performed until the detected temperature detected by the above becomes 75 ° C.

When heating is performed in this manner, the measured temperature after the agitation of the sake is 55.
° C, the average measurement temperature in case of 2 pieces is 53.7 ° C,
The average measurement temperature in the case of three concavities is 54.9 ° C, and the average measurement temperature in the case of four concavities is 52.7 ° C.

On the other hand, according to the conventional microwave oven, the set temperature is always 45 ° C. irrespective of the weight. The temperature is 46.2 ° C., the average measured temperature in the case of three sharp lines is 37.9 ° C., and the average measured temperature in the case of four sharp lines is 36.5 ° C.

Therefore, when heating with a conventional microwave oven, the set temperature is constant even if the weight (ie, the number of striking lines) increases, so the actual finishing temperature increases as the weight (number of striking lines) increases. Tends to be low. On the other hand, when heating with the microwave oven 100 according to the embodiment of the present invention, even if the weight (the number of sharpness) increases, the heating is automatically performed at the set temperature that is set higher accordingly. The finishing temperature hardly changes with weight. Therefore, irrespective of the number of bottles, the sake can always be heated to the optimum temperature.

Next, the case of "warm milk" will be described. Referring to Table 1, when microwave sensor 100 detects the weight of one cup of milk (about 640 g or less in this example) by weight sensor 501, control unit 90.
The heating is performed until the detected temperature detected by the above becomes 46 ° C. When the weight of two cups containing milk is detected, heating is performed until the temperature detected by the control unit 90 reaches 66 ° C. In addition, a cup 3 with milk
When the weight of the cup is detected, heating is performed until the temperature detected by the control unit 90 reaches 75 ° C. And
When the weight of four cups of milk is detected, heating is performed until the detected temperature detected by the control unit 90 reaches 80 ° C.

When heated in this way, the measured temperature of the milk after stirring is 5 for a cup.
6.4 ° C, average measured temperature for 2 cups is 56.2
° C, the average measured temperature for 3 cups is 56.0 ° C, and the average measured temperature for 4 cups is 56.0 ° C.

On the other hand, according to the conventional microwave oven, the set temperature is always 50 ° C. irrespective of the weight, the measured temperature for one cup is 63.0 ° C., and the average measured temperature for two cups is 43.2 ° C, average measured temperature for 3 cups is 38.1 ° C, average measured temperature for 4 cups is 3
1.0 ° C.

Therefore, when heating with a conventional microwave oven, the set temperature is constant even if the weight (that is, the number of cups) increases, so that as the weight (the number of cups) increases, the actual temperature increases. The finishing temperature tends to be low. On the other hand, the microwave oven 1 according to the embodiment of the present invention
In the case of heating at 00, even if the weight (the number of cups) increases, the heating is automatically performed at a set temperature that is set higher accordingly, so that the actual finished temperature hardly changes with the weight. . Therefore, the milk can always be heated to the optimum temperature regardless of the number of cups.

When a heating course is set and during heating, the display section 35 on the operation panel 34 displays a target finish temperature instead of a set temperature corresponding to the weight or number. Therefore, the user can know the target finish temperature without misunderstanding the target finish temperature.

As described above, according to the microwave oven 100 according to the embodiment of the present invention, it is possible to always warm the food to an optimum constant temperature regardless of the weight or the number of the food 31 to be heated. . In addition, since the target finish temperature is displayed on the display unit, the user can know the target finish temperature without misunderstanding the target finish temperature.

[0033]

According to the heating cooker according to the first aspect, when the food has a weight equal to or greater than the predetermined weight, the heating means is used until the control unit detects a predetermined temperature higher than the set finishing temperature. Is driven, it is possible to provide a heating cooker that can realize a constant finished temperature regardless of the number and weight of foods to be heated.

According to the heating cooker according to the second aspect, in addition to the effect of the first aspect, the finished temperature is displayed on the display unit regardless of the predetermined temperature, so that the actual finished temperature is displayed on the display unit. Will be displayed.

According to the cooking device of the third aspect, in addition to the effects of the first or second aspect, the infrared detector is disposed so as to catch the infrared radiation radiated from the food obliquely from above. However, it is possible to eliminate the detection unevenness.

[Brief description of the drawings]

FIG. 1 is a perspective view of a microwave oven according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a simplified internal structure of the microwave oven shown in FIG.

FIG. 3 is a block diagram showing a main electrical configuration of the microwave oven shown in FIGS. 1 and 2;

FIG. 4 is a flowchart for explaining the operation of the microwave oven shown in FIGS.

[Explanation of symbols]

 Reference Signs List 1 infrared sensor 17 cavity 22 magnetron 34 operation panel 35 display unit 80 heater 90 control unit (microcomputer) 100 microwave oven 501 weight sensor

[Procedure amendment]

[Submission date] May 19, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

[0021]

[Table 1]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

When the heating course is set and during the heating, the display section 3 on the operation panel 34 displays the target finishing temperature instead of the set temperature corresponding to the weight or the number. Therefore, the user can know the target finish temperature without misunderstanding the target finish temperature.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 Infrared sensor 3 Display unit 17 Cavity 22 Magnetron 34 Operation panel 80 Heater 90 Control unit (microcomputer) 100 Microwave oven 501 Weight sensor

Claims (3)

[Claims] 1. A heating chamber for storing food, heating means for heating the food in the heating chamber, a weight detector for detecting the weight of the food in the heating chamber, and the food in the heating chamber. An infrared detector that detects infrared radiation emitted from the control unit that drives the heating unit and detects a temperature of the food based on infrared radiation emitted from the food detected by the infrared detector. The control unit, when the food has a predetermined weight,
The heating unit is driven until a set finishing temperature is detected, and when the food has a weight equal to or more than the predetermined weight, the heating is performed until a predetermined temperature higher than the set finishing temperature is detected. A cooking device that drives the means. 2. The cooking device according to claim 1, further comprising a display unit for displaying the finished temperature regardless of the predetermined temperature during heating by the heating unit. 3. The cooking device according to claim 1, wherein the infrared detector is arranged to catch infrared rays emitted from the food obliquely from above.