JPH10274416A - Heating cooking utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat a foodstuff further inside definitely and to a satisfactory extent. SOLUTION: In the case when a normal temperature foodstuff, which is less than 500g, is heated to 75 deg.C, which is an intended finishing temperature, at first, the foodstuff is heated with a normal output 650W until the temperature of the foodstuff reaches 75 deg.C (first mode). On and after the time t1 at which the temperature of the foodstuff reaches 75 deg.C, the foodstuff is insulated and heated at 90 deg.C higher than 75 deg.C with a weak output of 350W.

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, which are examples of a cooking device, 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 (heating chamber), and the control unit detects the temperature of the food based on the detected infrared radiation. ing. Then, it is monitored whether or not the food has reached a target finishing temperature.

In this conventional microwave oven, a heating course for automatically heating the food based on the weight of the food is set in advance, and the heating course in the heating course is determined based on the temperature of the food detected as described above. Heating is controlled.

[0004]

Some of the foods to be heated are large or thick. In addition, there is also a thing which wants to sufficiently heat the inside of the food. However, in the conventional microwave oven as described above, even if infrared rays emitted from the food being heated are detected by the infrared sensor, mainly the temperature of the surface of the food is detected,
The temperature inside the food is not detected. Therefore, even if it is desired to heat the inside of the food firmly, there is a problem that the heating may be completed before the food is sufficiently heated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a heating cooker capable of reliably and sufficiently heating the inside of food.

[0006]

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 heater for placing the food in the heating chamber. A turntable, a turntable motor that drives the turntable, an infrared detector that detects infrared radiation emitted from the food, and a control unit that detects the temperature of the food based on the infrared light detected by the infrared detector. The control unit drives the heating means in the first mode until the food reaches the first temperature, and then controls the second mode in which the food is higher than the first temperature in the second mode. And the heating means is driven so as to maintain the second temperature.

According to a second aspect of the present invention, the first temperature is a target finish temperature of the food, and the second temperature is higher than the target finish temperature of the food. Is also a high temperature.

According to a third aspect of the present invention, there is provided a heating cooker according to the first or second aspect, further comprising a weight sensor for detecting the weight of the food, wherein the heating time in the first mode is: The heavier the food detected by the weight sensor, the longer the food.

[0009]

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. 2, the microwave oven 100 includes:
The infrared sensor 1 is arranged 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. Heater 80 used for oven heating
Are provided above the cavity 17 and below the bottom (the heater below the bottom of the cavity 17 is not shown).
By a key input on the keyboard 60 on the operation panel 34, a cooking heating course is set. Cooling fan 35
Are the magnetron 22 and its peripheral devices whose temperature has been increased by the heat of the cavity 17 (including the infrared sensor 1).
To cool. A door 15 is attached to the front of the cavity 17. A control unit (microcomputer) 90 for controlling these devices in a comprehensive manner is also provided on the operation panel 34.
It is provided on the back of. At the bottom of the cavity 17, a turntable 18 for placing food is rotatably provided. A turntable motor 505 for rotating the turntable 18 and a weight sensor 501 for detecting the weight on the turntable are arranged below the bottom surface of the cavity 17. And FIG.
FIG. 3 is a block diagram showing a main electrical configuration of the microwave oven 100 shown in FIGS. 1 and 2.

FIG. 4 shows the microwave oven 10 shown in FIGS.
FIG. 3 is a circuit diagram showing a specific circuit configuration of a 0. Referring to FIG. 4, a keyboard 60 used for setting input and a thermistor 511 for detecting the temperature in cavity 17 are also connected to control unit 90. 15A is a fuse, 1
5B is a temperature fuse, and RL-7 is a door switch that opens and closes in response to opening and closing of the door 15.

FIGS. 5 and 6 are flowcharts for explaining the operation of the microwave oven 100 shown in FIGS. 1 to 6, step S501 (hereinafter, referred to as step S501)
Steps are omitted), and key input for determining a heating course corresponding to a normal-temperature food (hereinafter, referred to as a normal-temperature food) or a frozen food is performed on the operation panel 34. S50
When a key input is made in step S1, it is determined in step S502 whether or not the heating course keyed in step S501 is a course for automatically heating (hereinafter, referred to as an automatic course). If it is determined in S502 that the input heating course is not the automatic course, the next setting is manually input (FIG. 5).
Abbreviated as the next process). If it is determined in S502 that the input heating course is an automatic course, then in S502
In step 503, it is determined whether or not the heating course keyed in S501 is a heating course (hereinafter, referred to as a warming course) for heating so that the inside of the food is sufficiently heated.

If the course is not input because of the warming in step S503, an automatic course (details are omitted) other than the warming course (a heating course in which heat insulation can be performed) is performed. If the course has been warmed up in S503, it is determined in S504 whether a start key for starting heating has been input. S5
If the start key is not input in 04, the process returns to S502, and the above operation is repeated. If it is determined in S504 that the start key has been input, the flag F0,
F1 is reset, and the heating start system is prepared. Here, the flag F0 is a discrimination flag indicating heating by normal output, and the flag F1 is a discrimination flag indicating heating by weak output.

In step S507, the switch RL-1 is turned on, and heating starts. In addition, in step S508, the switch RL-2 is turned on, and the turntable motor (hereinafter referred to as T.L.
505) is turned on. Further, in step S509, the switch RL-6 is turned on, and the chopper motor (hereinafter, referred to as chopper motor) is turned on.
C. M) is turned on. Then, in step S510, the switch RL-5 is turned on, and the oscillation of the magnetron 22 is started. In this example, the food is heated by the magnetron 22, but depending on the heating course, the switch RL may be used.
-3, RL-4 may be turned on and heating may be performed by the heater 80. Also, the magnetron 22 and the heater 80
In some cases, heating is performed using both.

In step S511, the weight of the food placed on the turntable is detected by the weight sensor 501. In a normal heating course, an optimum heating time for a food having a predetermined weight is set in advance. However, if the detected weight of the food is heavier than the predetermined weight, it is necessary to newly set an additional heating time (hereinafter, referred to as an additional heating time). Further, it is determined whether the food to be heated in S512 is a frozen food (that is, a normal-temperature food). In the case of frozen food, it is necessary to newly set an additional heating time. Based on the weight detected in S511 and the result of the determination in S512, the additional heating time t0 in S513, the warming temperature Tx of the food at that time, the finishing temperature T0,
The heat retention tx is determined.

In step S514, the temperature T1 of the food is detected based on the amount of infrared light from the food detected by the infrared sensor 1. In S515, it is determined whether or not the detected temperature T1 has become T1 ≧ T0. If T1 ≧ T0 in S515, S
Returning to step 514, food temperature detection is performed until T1 ≧ T0. If T1 ≧ T0 in S515,
In S516, a timer countdown is started to measure the heating time from the start of heating to the end of heating. In S516, the countdown of the timer is started, and the additional heating time t0 is measured. Then, in S517, the count value t0 of the timer (that is, the additional heating time) becomes t0 = 0.
Is determined. When the weight of the food is less than the predetermined weight, the count value t0 of the timer is t0.
= 0.

In step S517, the count value t0 of the timer is still obtained.
Is determined not to be t0 = 0, the process returns to step S516, and the temperature T1 of the food being heated is detected. If it is determined in S517 that the count value t0 of the timer has reached t0 = 0, heating is performed with a low output in S518. In S519, the temperature T2 of the food being heated at a low output is detected based on the amount of infrared light detected by the infrared sensor 1. Then, in S520, the heat retention time tx is counted down by a timer. Then, in S521, it is determined whether or not the count value tx (that is, the heat retention time) is tx = 0 (that is, whether or not the heat retention heating is completed).

At S521, the count value tx of the timer is still equal to
If it is determined that the value is not 0 (the heating and heating is not completed), it is determined in S522 whether or not the temperature T2 of the food during the heating and heating with the low output becomes T2 ≧ Tx. S52
If it is determined in step 2 that T2 ≧ Tx, the magnetron 22 is stopped in S523 and the heating is temporarily turned off. Thereby, a rise in the temperature of the food is suppressed. And S5
Returning to step 19, the temperature T2 of the food whose heating at the low output has been turned off is detected until the count value tx becomes 0 (until the heat keeping heating is completed). In S522, the temperature T (= T2) of the food decreases due to the passage of time or the like, and T2 ≧ T
If it is determined that x has been reached, the process returns to step S518, and the food is heated again with a low output.

When the count value tx of the timer reaches 0 in S521 (when the heating and heating is completed), the switch RL-5 is turned off in S524, and the oscillation of the magnetron 22 stops. Subsequently, the switch RL-2 is turned off in S525,
T. The T motor turns off. Further, in step S526, the switch R
L-6 is turned off, and C.I. M is turned off, the switch RL-1 is turned off in S527, and the heating ends. Then, the microwave oven 100 enters a standby state for the next heating.

FIG. 7 is a diagram showing a specific example of the temperature change of the room temperature food heated by the microwave oven 100 according to the flowcharts of FIGS. 5 and 6, wherein FIG.
It is a figure which shows the temperature change of the room temperature food of less than g, and (b) is a figure which shows the temperature of the room temperature food of 500 g or more. FIG.
Referring to (a), when heating room-temperature food of less than 500 g, the desired finishing temperature of 75 ° C. with an output of 650 W
The food 31 is heated until it reaches (= T0). Time t when the temperature T (= T1) of the food 31 reaches 75 ° C.
_{The first} mode is referred to as a _first mode, and the time after time t1 is referred to as a second mode.

In the second mode after time t ₁ , during the heat retention time tx (not shown in FIG. 7), the food 31 has a weak output 35.
Heating and heating at 90 ° C. (= Tx) higher than 75 ° C. at 0 W. By this heat-retaining heating, the food 31 can be gradually and sufficiently heated to the inside of the food without burning. Here, the temperature T of the food 31 at the time of the above-mentioned heat retention heating is set.
The magnetron 22 or the heater 80 is turned on / off so that (= T2) is maintained at about 90 ° C.

Here, the warming time tx shown in S513 of FIG. 5 becomes longer as the weight of the food increases. Also, the length of the frozen food is long. Actually, for example, a time obtained by multiplying the heating time required to reach the finish temperature T0 by a coefficient which is larger as the weight of the food becomes heavier and which is larger in the case of frozen food is set as the heat retention time tx.

Next, referring to FIG. 7 (b), when heating room temperature food of 500 g or more, until the temperature of the food 31 reaches 80 ° C. (= T0), which is slightly higher than the target finishing temperature, at a normal output of 650W. Is heated. Then, the temperature T (= T1) of the food 31 is heated continuously from the time t ₂ has been reached 80 ° C. until further time t ₃ (= 1.4t _2). Up to this time t ₃ the first mode, the time t ₃ and later referred to as a second mode.

Time t_ThreeIn the second mode,
During the time tx (not shown in FIG. 7), the food 31 has a low output 3
Warm at 100 W (= Tx) higher than 80 C at 50 W
Get heated. Burning the food 31 by this heat retention
Without heating the inside of the food 31
Can be. Here, time t in FIG._TwoFrom time t _Three
Corresponds to the additional heating time t0 in S513. Also,
At the time of heat retention, the temperature T (= T2) of the food 31 is approximately 8
To keep the temperature constant at 0 ° C., the magnetron 22 or
Turns on / off the heater 80.

FIG. 8 is a diagram showing a specific example of the temperature change of the frozen food heated by the microwave oven 100 according to the flowcharts of FIGS. 5 and 6, wherein FIG. 8A shows the temperature of the frozen food less than 500 g. FIG.
(B) is a figure which shows the temperature of 500 g or more of frozen foods. Referring to FIG. 8 (a), when heating frozen food of less than 500 g, frozen food is less likely to be heated than normal-temperature food, so that 80 ° C., which is higher than the target finishing temperature of 75 ° C. at a normal output of 650 W, is used. The food 31 is heated until it reaches (= T0). The temperature T (= T1) of the food 31 is 7
The first mode until time t ₄ when 5 ° C. is reached, time t ₄
The following is referred to as a second mode.

In the second mode after time t ₄ , the food 31 has a low output 3 during the warming time tx (not shown in FIG. 8).
Heating is performed at a temperature of 110 ° C. (= Tx) higher than 80 ° C. at 00 W. By this heat-retaining heating, the food 31 can be gradually and sufficiently heated to the inside of the food without burning. Here, the temperature T of the food 31 at the time of the above-mentioned heat retention heating is set.
(= T2) is kept constant at about 110 ° C.
The magnetron 22 or the heater 80 is turned on / off.

Next, referring to FIG.
650W output when heating normal temperature foods
Food 3 until the temperature reaches 80 ° C, slightly higher than the glue temperature
1 is heated. The temperature T (= T1) of the food 31 is 75 ° C.
Time t when (= T0) _FiveFrom time t₆(=
1.4t_Five). This time t₆Until
In the first mode, time t₆The following is referred to as a second mode.

In the second mode after time t ₆ , the food 31 has a low output 3 during the warming time tx (not shown in FIG. 8).
Heating is performed at a temperature of 110 ° C. (= Tx) higher than 80 ° C. at 00 W. By this heat-retaining heating, the inside of the food can be gradually and sufficiently heated without burning the food. Here, the time t ₆ from time t ₅ in FIG. 8 (b) is S
This corresponds to 512 additional heating times t0. In addition, at the time of the heat retention heating, the temperature T (= T2) of the food 31 is almost 110
The magnetron 22 or the heater 80 is turned on / off so that the temperature is kept constant at ° C.

Therefore, when the food to be heated is large or thick, and when it is desired to sufficiently heat the inside of the food, it is possible to sufficiently heat the inside of the food.

Further, in the first mode, the heating is rapidly performed at a temperature higher than the finishing temperature, and thereafter, the finishing temperature is adjusted by the heat-retention heating in the second mode.
It is also possible to end the heating in a short time.

As described above, according to the microwave oven 100 according to the embodiment of the present invention, it is possible to automatically heat the food in an optimal heating course and sufficiently heat the inside of the food.

[0032]

According to the heating cooker according to the first aspect, the control unit drives the heating means in the first mode until the food reaches the first temperature, and then in the second mode. The heating means is driven so that the food reaches a second temperature higher than the first temperature and maintains the second temperature. Therefore, it is possible to sufficiently heat the inside of the food.

According to the heating cooker of the second aspect, in addition to the effect of the first aspect, the first temperature is a target finish temperature of the food, and the second temperature is higher than the target finish temperature of the food. Because the temperature is also high, the food is easily heated sufficiently.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, the heating time in the first mode becomes longer as the weight of the food detected by the weight sensor increases. Therefore, when the weight is heavy, it is determined that the food is large or thick, and sufficient heating is performed.

[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 an electric configuration of the microwave oven shown in FIGS. 1 and 2;

FIG. 4 is a circuit diagram showing a specific configuration of the microwave oven shown in FIGS.

FIG. 5 is a flowchart for explaining the operation of the microwave oven shown in FIGS.

FIG. 6 is a flowchart for explaining the operation of the microwave oven shown in FIGS.

FIG. 7 is a diagram showing a specific example of a temperature change of a normal-temperature food heated by a microwave oven according to the flowcharts of FIGS. 5 and 6, and FIG. 7A is a diagram showing a temperature change of a normal-temperature food of less than 500 g; (B) is a diagram showing the temperature of the room temperature food of 500 g or more.

8 is a diagram showing a specific example of a temperature change of frozen food heated by a microwave oven according to the flowcharts of FIGS. 5 and 6, and FIG. 8 (a) is a diagram showing a temperature change of frozen food less than 500 g; (B) is a diagram showing the temperature of the frozen food of 500 g or more.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infrared sensor 17 Cavity 18 Turntable 22 Magnetron 34 Operation panel 60 Keyboard 80 Heater 90 Control part (microcomputer) 100 Microwave oven 505 Turntable motor 501 Weight sensor

Claims (3)

[Claims] 1. A heating chamber for storing food, heating means for heating the food in the heating chamber, a turntable for placing the food in the heating chamber, and driving the turntable Turntable motor, an infrared detector for detecting infrared radiation emitted from the food, and based on the infrared light detected by the infrared detector,
A control unit for detecting a temperature of the food, wherein the control unit drives the heating unit until the food reaches a first temperature in a first mode, and then, in a second mode, A cooking device, wherein the food reaches a second temperature higher than the first temperature and drives the heating means so as to maintain the second temperature. 2. The food according to claim 1, wherein the first temperature is a target finish temperature of the food, and the second temperature is a temperature higher than the target finish temperature of the food. Cooking cooker. 3. The apparatus according to claim 1, further comprising a weight sensor configured to detect a weight of the food, wherein a heating time in the first mode increases as the weight of the food detected by the weight sensor increases.
Or the heating cooker according to 2.