JP3316953B2 - 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, and more particularly to a cooking device for performing automatic cooking or the like by using both high-frequency heating and radiant heating.

[0002]

2. Description of the Related Art Conventionally, there is a microwave oven in which a magnetron for performing cooking such as reheating and thawing and a heater for baking cakes and breads are mounted on a single device, and many menus can be cooked. . For example, as shown in FIG. 12, a magnetron 1 for generating a high frequency and a heater 2 for radiant heating are provided, the food 3 is put in a cooking chamber 4 and placed on a table 5 for cooking. By operating, the food is heated by the magnetron 1 for a range menu such as reheating and thawing, and the food is heated by the heater 2 for an oven menu such as cake and bread. Reference numeral 7 denotes a start key, which is used to start cooking by pressing this key. Generally, cooking finish information is obtained from the weight sensor 8 or the temperature sensor 9 to automatically complete cooking.

For example, when baking a cake in such a microwave oven, a heater 2 is used. A menu with a thin dough like a roll cake can be cooked at a high temperature of about 200 ° C for a short time of about 15 minutes, while a thick one like a sponge cake can be slowly cooked at a slightly lower temperature of about 150 ° C for about 40 minutes. I cook around.

In order to cook the sponge cake in a shorter time, a high frequency is generated by the magnetron 1 and the thick dough is heated from the inside, and the surface is browned by the heater 2. The management of the time to do it is delicate and if it is wrong, it will be burnt or dry. If this time management is to be performed by the weight sensor 8, there is a problem that the weight of the container cannot be specified, and there is a problem of a structural restriction that connects the weight sensor 8 and the mounting table 5, and the temperature sensor 9 hardly recognizes a change. However, there is only a case where a high frequency is generated for a very short time with a sufficient margin.

[0005]

In such a conventional heating cooker, the advantages of both can be successfully combined despite the fact that the magnetron as the high frequency heating means and the heater as the radiation heating means are mounted. There was a menu that took a long time to cook. In addition, even if it is called cake, the menu must be selected by the user because the cooking sequence is different between a thick menu such as sponge cake and a thin menu such as roll cake, and more specifically, Madeleine, pound There are menus with different shapes, such as cakes, and each requires a menu selection key corresponding to each to achieve a good finish. In this way, there is a menu selection key that is difficult for a user who selects a detailed menu to understand, or the finish is divided into the same cooking sequence, or the selection key is deleted as an automatic cooking menu. However, there has been a problem that both users feel dissatisfied. Further, since both the heater and the magnetron generally consume large power, there has been a problem that high-frequency heating and radiant heating cannot be performed simultaneously with an ordinary household outlet capacity.

[0006] The present invention has been made to solve the above-mentioned problems, and a first aspect is as follows.
The first object of the present invention is to shorten the cooking time by optimally combining high-frequency heating and radiant heating while detecting the temperature of food with an infrared temperature sensor.

A second object is to accurately detect the temperature of food in a wide temperature range and improve the accuracy of cooking.

A third object is to increase the reliability by protecting the infrared temperature sensor from the heat of the atmosphere.

A fourth object is to make it possible to cook a plurality of cooking menus in a common cooking sequence by controlling the heating based on food temperature information obtained from an infrared temperature sensor, and to improve the usability by integrating menu selection keys. Aim.

[0010]

[0011]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention provides a cooking chamber for storing food, a high-frequency heating means for high-frequency heating the food in the cooking chamber, and a food in the cooking chamber. Radiant heating means, an infrared temperature sensor for thermoelectrically converting the amount of infrared radiation radiated from food in the cooking chamber, and driving of the high-frequency heating means and the radiant heating means controlled by an output from the infrared temperature sensor. A heating controller was provided.

In order to achieve the second object, a plurality of food temperature detecting circuits for detecting the temperature of food stored in the cooking chamber from the output of the infrared temperature sensor, and the output of the plurality of food temperature detecting circuits. The output of at least one of the food temperature detection circuits is selected, and a food temperature calculator for calculating the temperature of the food is provided.

In order to achieve the third object, a cooking chamber is provided with an opening in a path through which infrared rays radiated from foods reach an infrared temperature sensor, and a switch for opening and closing the opening. And an opening / closing controller for controlling the driving of the switch to close the opening while the food is being heated by the radiant heating means.

In order to achieve the fourth object, an infrared ray
Detecting the temperature rise rate of food by the output of the temperature sensor
Temperature rise rate detector and output of the temperature rise rate detector
Radiation time calculator for calculating the operation time of radiant heating means
And the heating controller detects the infrared temperature sensor.
High-frequency heating until the temperature reaches a preset temperature
After driving the heating means, the temperature detected by the temperature rise detector
Time calculated by the radiation time calculator from the temperature rise rate, radiation
The heating and heating means are controlled to be driven.

[0015]

[0016]

According to the first aspect of the present invention, an infrared temperature sensor detects the temperature of food in a cooking chamber, and a heating controller drives the high-frequency heating means using the detected temperature. Control, drive control of the radiant heating means, or both. That is, the progress of cooking is detected based on the temperature of the food, and the food is heated by an optimal heating means accordingly.

Further, according to the second means for solving the problem, the food temperature calculator selects an appropriate output of the food temperature detection circuit from a plurality of food temperature detection circuits corresponding to the respective temperature bands from low to high temperature, and controls the temperature of the food. By calculating, the food temperature is detected in a wide temperature range.

Further, according to the third means for solving the problem, the infrared temperature sensor detects the temperature of the food through an opening provided in the cooking chamber, and the opening / closing controller controls the opening / closing controller in the opening during heating by the radiant heating means. By controlling the drive to close the provided switch, the infrared temperature sensor and the cooking chamber are thermally shut off during the radiant heating.

According to the fourth means for solving the problems, at the beginning of cooking, the heating controller heats the food by the high frequency heating means until the temperature of the food in the cooking chamber detected by the infrared temperature sensor reaches a predetermined temperature. Here, the high-frequency heating end determining unit determines that the predetermined temperature has been reached, and at this stage, the heating switching unit switches the heating unit and starts heating the food with the radiant heating unit.
Furthermore, the temperature rise rate of the food detected by the infrared temperature sensor during heating by the high-frequency heating means is detected by the temperature rise rate detector, and the radiation time calculator computes the time required for radiant heating from the output, and the computation result Is used to determine the completion of the radiant heating. That is, the progress of cooking in a plurality of cooking menus is centrally detected based on the food temperature information, and the completion of cooking is determined.

[0020]

[0021]

An embodiment of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, an example in which the present invention is applied to a microwave oven as a heating cooker will be described. In FIG. 1, reference numeral 10 denotes an infrared temperature sensor that detects the temperature of the food 3 in a non-contact manner by converting an amount of infrared radiation radiated from the food 3 as an object into an electric signal. As the infrared temperature sensor, there is a so-called thermopile type having a hot junction and a cold junction therein, and a so-called pyroelectric type having a chopper. 11 is a thermistor for cooking room 4
Detect the temperature of

Reference numeral 12 denotes a heating controller, which is a menu selection key 6,
Cooking start key 7, infrared temperature sensor 10, thermistor 7
Controls the magnetron 1 as high-frequency heating means and the heater 2 as radiant heating means based on output information from
A heating means selector 13, a high-frequency heating controller 14, and a radiant heating controller 15 are provided inside.

The heating means selecting section 13 includes the infrared temperature sensor 1
From the temperature of the food 3 obtained from 0, whether to heat with the magnetron 1, the heater 2, or both is selected, and the high-frequency heating control unit 14 and the radiant heating control unit 15 receive a drive permission signal or a drive inhibition signal. Is output.

The high-frequency heating control unit 14 includes the heating unit selection unit 1
While the drive permission signal is being received from the control unit 3, the drive of the magnetron 1 is controlled based on the temperature of the food 3 detected by the infrared temperature sensor 10. Radiation heating control unit 15
While the drive permission signal is being received from the heating means selecting unit 13, the heater 2 is controlled by the temperature of the food 3 detected by the infrared temperature sensor 10 or the temperature of the cooking chamber 1 detected by the thermistor 11.
Control such as on / off control and capacity control.

The operation of baking a sponge cake as a specific operation will be described with reference to the flowcharts of FIGS. In the flowchart of FIG. 2, the numbers of the parts in FIG. 1 corresponding to the operations are given. In addition, the food 3 in FIG. 1 will be described on the assumption that the sponge cake dough is put in a mold.

The user puts the cake dough in a mold, places it on the plate 16 and stores it in the cooking chamber 4, and selects a desired menu sponge cake using the menu selection key 6. The menu selection keys include pound cake and roll cake as well as sponge cake as a cake menu. Pressing the cooking start key 7 starts cooking the sponge cake.
First, as a first step, the heating means selecting unit 13 outputs a drive permission signal to the high-frequency heating control unit 14 to heat the entire dough, and outputs a drive inhibition signal to the radiant heating control unit 15, and the high-frequency heating control unit 14 drives the magnetron 1 to perform high-frequency heating.

Sponge cake 3 with infrared temperature sensor 10
The magnetron 1 is always driven at the maximum capacity until Tc> Tcs1. Where Tc
It is appropriate that s1 is a predetermined temperature which is usually about 60 to 70 ° C. The predetermined temperature Tcs1 may be different for each menu. When Tc> Tcs1, the high-frequency heating control unit 14 lowers the capability of the magnetron 1 and drives it with low capability. This is a process in which the dough starts to swell. In this process, if the heating of the dough is not uniform, the dough may be deformed or boiled or dried at the time of finishing. In order to uniformly heat the entire dough, it is desirable to reduce the ability. However, if it is possible to uniformly heat the whole by using a plurality of magnetrons, diffusing radio waves with an impeller, or rotating the sponge cake 3, there is no need to reduce the performance. The capacity control may be performed by an inverter power supply, or may be performed by duty control such as driving for 3 seconds and stopping for 7 seconds. Low-frequency high-frequency heating is performed until Tc> Tcs2.

Tcs2 is a temperature at which the dough almost completely swells at a predetermined set temperature, and is usually desirably 90 to 100 ° C. This Tcs2 may be set to a different temperature depending on the menu. When Tc> Tcs2, the heating means selection unit 13 outputs a drive prohibition signal to the high-frequency heating control unit 14 and a drive permission signal to the radiation heating control unit 15. From here, cooking shifts to a process of browning the surface of the sponge cake 3. This scoring process is Tc> Tcs3
Repeat until

This Tcs3 is 12 at a predetermined temperature.
It is about 0-150 ° C. In the process of adding the browning, the radiant heating control unit 15 performs on / off control of the heater 2 based on the temperature Tr of the cooking chamber 4 which can be detected by the thermistor 11. This is for uniformly browning the entire fabric and for protecting the heater 2 itself from heat. Temperature Trs + Δ higher by ΔTrs than predetermined temperature Trs
If Tr> Trs + ΔTrs as compared with Trs, the energization of the heater 2 is stopped, and the temperature Tr of the cooking chamber 4 decreases to T
When r <Trs−ΔTrs, the heater 2 is energized to control the temperature of the cooking chamber 4 to be substantially maintained at Trs. T
A relatively high temperature of about 200 ° C. is appropriate for rs, and ΔTrs
About 3 deg is appropriate. Also, Trs, ΔTrs
May be different depending on the menu.

Although the above description has been made with reference to the case of cooking a cake which has particularly long cooking time, the same effect can be obtained by cooking a side dish such as gratin, hamburger, grilled fish and the like. For example, if a fish is to be grilled, it is first heated by the magnetron 1 and when the surface temperature detected by the infrared temperature sensor 10 reaches a predetermined temperature, the heater 2 is used to scorch and simultaneously remove the odor peculiar to the fish. In addition to shortening the time, it also has the effect of making it delicious without escaping water and oil. In general, in thawing, which is a typical menu of high-frequency heating cooking, the magnetron 1 and the heater are alternately driven or simultaneously driven after the food temperature which can be detected by the infrared temperature sensor 10 reaches a predetermined temperature by heating with the magnetron 1 to achieve high speed. It is also possible to perform thawing with good temperature distribution.

Next, as a second embodiment of the present invention, a food temperature detecting circuit for processing an electric signal obtained from an infrared temperature sensor will be described. Here, a case will be described in which a sensor called a thermopile type which has a hot junction and a cold junction and generates a voltage between the contacts according to the temperature of an object is used as the infrared temperature sensor.

In FIG. 3, an infrared temperature sensor 10 outputs a voltage between the hot junction 10a and the cold junction 10b. 17a and 17b are food temperature detection circuits, and operational amplifiers 18a and 18b and resistors 19a and
This is an amplifier circuit including 19b, 20a, and 20b. The amplification factor is determined by the resistors 19a, 19b, 20a, and 20b. The food temperature detection circuits 17a and 17b have different amplification factors. That is, the food temperature detection circuit 17a has a large amplification factor for detecting a temperature lower than 100 ° C. so that the resolution can be fine. Although the food temperature detection circuit 17b has a high resolution,
The amplification factor is reduced to detect temperatures of 00 ° C. or higher.

Reference numeral 21 denotes a food temperature calculator, which is constituted by a microcomputer having an A / D conversion function. Food temperature calculator 21
If the output of the food temperature detection circuit 17a is less than a predetermined value, the food temperature is determined to be less than 100 ° C.
The food temperature Tc is calculated based on the output voltage Va of FIG.
The calculation is performed as Va + T0. Here, Ka is a predetermined constant corresponding to the amplification factor of the food temperature detection circuit 17a.
Is the ambient temperature of the infrared temperature sensor 10.

If the output of the food temperature detection circuit 17a is equal to or higher than a predetermined value, the food temperature calculator 21 determines that the temperature is 100 ° C. or higher, and determines the food temperature Tc based on the output voltage Vb of the food temperature detection circuit 17b as Tc = Kb. It is calculated as × Vb + T0.
Here, Kb is a predetermined constant corresponding to the amplification factor of the food temperature detection circuit 17b. Although this arithmetic expression is simply expressed by a linear expression, it is also possible to improve the accuracy by approximation by a higher-order expression. The food temperature calculator 21 outputs the calculation result as a food temperature.

Numerals 22 and 23 are connected in series with a DC power supply, and operational amplifiers 18a and 18b and a food temperature calculator 21 are connected from both ends thereof.
Power supply. In addition, the midpoint potential is connected to the cold junction 10b of the infrared temperature sensor 10 to serve as a reference potential. In correspondence with the above embodiment, Tc> Tcs1 determination, Tc>
The temperature zone for determining Tcs2 is the food temperature detection circuit 17a.
The food temperature detection circuit 17b detects the temperature zone in which Tc> Tcs3 is determined, and the Tc> Tcs2 determination with strict accuracy is accurately detected with a fine resolution.
The determination of c> Tcs3 is a rough detection.

FIG. 4 shows another embodiment. FIG. 4 and FIG.
The difference is that the amplification is performed in two stages. First, the first-stage amplification is performed by an amplifier circuit including an operational amplifier 24 and resistors 25 and 26. The amplified output voltage is further amplified in the second stage by the food temperature detection circuits 17a and 17b. The food temperature detection circuits 17a and 17b are composed of operational amplifiers 18a and 18b and resistors 19a, 19b, 20a and
0b. Food temperature calculator 17a
And 17b have different potentials as the reference for amplification. For this reason, the DC power supplies 22a, 22b, and 23 are connected in series.
The food temperature detection circuit 17a uses the midpoint potential of the DC power supplies 22a and 22b as a reference for amplification, and the food temperature detection circuit 17b uses the midpoint potential of the DC power supplies 22b and 23 as the amplification reference.

The food temperature calculator 21 similarly calculates the food temperature Tc based on the output voltage Va of the food temperature detection circuit 17a if the output of the food temperature detection circuit 17a is less than a predetermined value.
If it is not less than the predetermined value, the food temperature Tc is calculated based on the output voltage Vb of the food temperature detection circuit 17b. In this case, one more amplifier circuit is required, but a wide temperature range can be detected without changing the resolution. The thermopile type infrared temperature sensor has been described above, but the same effect can be obtained with a pyroelectric type infrared temperature sensor having a chopper.

Next, a third embodiment of the present invention will be described with reference to FIGS. An opening 27 is provided in the cooking chamber 4, and a switch 28 for opening and closing the opening 27 is provided. The switch 29 is driven by a motor 29, and the motor 29 is controlled by a switch controller 30. The opening / closing controller 30 controls the motor 29 based on a signal from the heating means selection unit 13. When the heating means selection unit 13 outputs a drive permission signal to the radiant heating control unit 15, the motor is controlled to close the opening 27. When the drive 29 is driven and a drive prohibition signal is output to the radiation heating control unit 15, the motor 29 is driven so as to open the opening 27. That is, during the radiant heating, the infrared temperature sensor 10 is protected from the heat of the cooking chamber 4 by closing the opening 27.

An example of cooking a cake as a specific operation in this case will be described with reference to the flowchart of FIG. In the flowchart of FIG. 6, the numbers of the parts of FIG. 5 corresponding to the operations are given.

The user puts the cake dough in a mold, places it on the plate 16 and stores it in the cooking chamber 4, and selects a desired menu using the menu selection key 6. The menu selection keys include a sponge cake, a pound cake, and a roll cake as cake menus. Pressing the cooking start key 7 starts cooking the cake.

As a first step, the heating means selecting section 13
Outputs a drive permission signal to the high-frequency heating control unit 14 to heat the entire dough, outputs a drive inhibition signal to the radiant heating control unit 15, and the high-frequency heating control unit 14 drives the magnetron 1 to perform high-frequency heating. I do. Heating means selection unit 1
3 also outputs a signal to the opening / closing controller 30 at the same time, and the opening / closing controller 30 drives the motor 29 to open the opening 27 to secure a path for infrared rays emitted from the cake 3 to reach the infrared temperature sensor 10.

The surface temperature Tc of the cake 3 is detected by the infrared temperature sensor 10, and the high-frequency heating control unit 14 drives the magnetron 1 at the maximum capacity at all times until Tc> Tcs1, and furthermore, when the temperature of the food 3 rises, Tc> The capability of the magnetron 1 is reduced until it reaches Tcs2, and the magnetron 1 is driven with low capability. T
When c> Tcs2, the heating means selecting unit 13 outputs a driving prohibition signal to the high-frequency heating control unit 14 and a driving permission signal to the radiation heating control unit 15. At this time, a signal is simultaneously output to the opening and closing controller 30, and the opening and closing controller 30 drives the motor 29 to close the opening 27 and protect the infrared temperature sensor 10 from the heat of the cooking chamber 4.

From here, cooking proceeds to the process of browning the surface of the cake 3. The time required for radiation differs depending on the menu and is a predetermined time, for example, ts1 = 12 minutes for sponge cake, ts2 = 10 minutes for pound cake, and ts3 for roll cake.
= 6 minutes or the like is stored in the heating controller 12. This depends largely on the thickness of the dough, and the sponge cake with a thick dough has a long time, the roll cake with a thin dough has a short time, and the pound cake is set at about the middle.

The heating controller 12 sets the radiation setting time ts = ts1 if, for example, a sponge cake is being cooked by the cooking menu input from the menu selection key 6. The radiation heating control unit 15 starts heating with the heater 2 and simultaneously starts counting the radiation time t. In the process of applying the browning, the radiant heating control unit 15 uses the thermistor 1
The on / off control of the heater 2 is performed based on the temperature Tr of the cooking chamber 4 which can be detected from 1 and the control is performed such that the temperature of the cooking chamber 4 substantially maintains a predetermined temperature Trs. Trs is 200
A relatively high temperature of about ° C is appropriate and may differ depending on the menu. When the elapsed time t counted from the start of the radiant heating becomes t> ts, the radiant heating control unit 15 terminates the heating and notifies the user of the completion of the cooking such as display and notification.

Here, it has been described that when the opening 27 is closed by the switch 28, the infrared ray path from the food 3 is cut off and the temperature of the food 3 cannot be detected. However, if the switch 28 is made of a material that transmits infrared light. Even when the opening 27 is closed, the temperature of the food 3 may be detected, and the radiant heating control unit 15 may control the heater 2 based on the detected temperature. In this case, it is necessary to detect the temperature of the food 3 in consideration of the transmittance of the switch 28, but the accuracy is slightly lowered, but at least Tc> Tc
When the determination of s2 is performed, since the opening 27 is in the open state, the temperature of the food 3 can be accurately detected, and the high-frequency heating can be appropriately switched to the radiant heating.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. Reference numeral 31 denotes a heating changer which preliminarily stores a procedure in which the food is heated by the high frequency heating means at the beginning of cooking, and the heating means is switched from the middle to heat the food by the radiant heating means. That is, the heating switching unit 31 outputs a drive permission signal to the high-frequency heating control unit 14 at the beginning of cooking, heats the food 3 with the magnetron 1, switches the food 3 in the middle, outputs a drive permission signal to the radiant heating control unit 15, and controls the heater 2. Heat.
It is the high-frequency heating end determiner 32 that determines this switching opportunity. The high-frequency heating end determination unit 32 outputs a signal to the heating switching unit 31 when the temperature of the food 3 output from the infrared temperature sensor 10 reaches a predetermined temperature and switches from heating by the magnetron 1 to heating by the heater 3. To indicate that

Reference numeral 33 denotes a temperature rising speed detector which measures the time required for the temperature of the food 3 detected by the infrared temperature sensor 10 to rise from a first predetermined temperature to a second predetermined temperature. Numeral 34 denotes a radiation time calculator for calculating the radiation heating time from the temperature rise time measured by the temperature rise speed detector 33.

Numeral 35 denotes a cooking completion judging device which is a radiation time calculator 3
After outputting the drive permission signal to the radiant heating control unit 15 for the time calculated in 4, the cooking completion signal is output and the heating is stopped. That is, the food 3 is heated by the magnetron 1 until the temperature of the food 3 reaches a predetermined temperature, and is heated by the heater 2 for a time calculated based on the heating time.

The relationship between the temperature rise time tm measured by the temperature rise rate detector 33 and the radiation time ts will be described with reference to FIG. FIG. 8 shows the surface temperature change characteristics of the cake dough as the heating progresses. High-frequency heating at the maximum capacity is performed until the surface temperature Tc reaches Tcs1, and low-frequency heating is performed until the surface temperature Tcs2 is reached. Hereinafter, an example in the case of performing radiant heating is shown. Time tm of high-frequency heating from the time when the surface temperature Tc exceeds Tcs1 to the time when it reaches Tcs2
And the appropriate time ts after which the radiant heating is performed is approximately proportional. This is because tm and ts most depend on the thickness and shape of the fabric, and since the elements that have the most influence are the same, the result is a roughly proportional relationship. FIG. 8 illustrates an example in which the initial temperatures of the dough are the same, but the tendency of the proportional relationship is the same even when the initial temperatures are different.

An example of cooking a cake as a specific operation in this case will be described with reference to the flowchart of FIG. In the flowchart of FIG. 9, the numbers of the parts in FIG. 7 corresponding to the operations are given. The user puts the cake dough in a mold, places it on the plate 16 and stores it in the cooking chamber 4, and selects a desired menu using the menu selection key 6. The menu selection key 6 is used to select a large menu such as cake and grilled fish. Pressing the cooking start key 7 starts cooking the cake. First, as a first step, the heating switching unit 31 outputs a drive permission signal to the high frequency heating control unit 14, outputs a drive inhibition signal to the radiant heating control unit 15, and the high frequency heating control unit 14 drives the magnetron 1 Perform high frequency heating. The heating switch 31 also outputs a signal to the switching controller 30 at the same time.
0 drives the motor 29 to open the opening 27. The surface temperature Tc of the cake 3 is detected by the infrared temperature sensor 10 and T
Until c> Tcs1, the high-frequency heating control unit 14 always drives the magnetron 1 at the maximum capacity, and further lowers the capacity of the magnetron 1 until the temperature of the food 3 becomes Tc> Tcs2 to drive the magnetron 1 at a low capacity. The temperature rise rate detector 33 counts the time from when Tc> Tcs1 to when Tc> Tcs2. When Tc> Tcs2, the heating means selection unit 13 outputs a drive prohibition signal to the high-frequency heating control unit 14 and a drive permission signal to the radiation heating control unit 15.

The radiation time calculator 34 calculates the time t required for radiation based on the time tm counted by the temperature rise speed detector 33.
s is calculated as ts = A × tm + B. Where A, B
Is a predetermined constant. At this time, the heating switch 31 outputs a signal to the switching controller 30, and the switching controller 30
Is driven to close the opening 27 to protect the infrared temperature sensor 10 from the heat of the cooking chamber 4. From here, cooking moves to the process of browning the surface of the cake 3. The radiant heating control unit 15 starts heating with the heater 2 and the cooking completion determination unit 35 sets the radiant time t.
Start counting. In this scorching process, the radiant heating control unit 15 performs on / off control of the heater 2 based on the temperature Tr of the cooking chamber 4 which can be detected by the thermistor 11, and the temperature of the cooking chamber 4 substantially maintains a predetermined temperature Trs. To control. Although a relatively high temperature of about 200 ° C. is appropriate for Trs, it may be determined in relation to the high-frequency heating time tm. When the elapsed time t counted from the start of the radiant heating becomes t> ts, the cooking completion determiner 35 outputs a completion signal to the radiant heating control unit 15 to end the heating, and displays the cooking and other information to the user. Signal completion.

In the above example, the temperature rise rate detector 33 is set to T
The time from when c> Tcs1 to when Tc> Tcs2 was counted, which is obtained by using, for convenience, Tcs1 which is the set temperature for switching the high-frequency heating capacity and Tcs2 which is the set temperature for switching the heating means. However, the present invention is not restricted to the present invention, and there may be another set temperature for detecting the temperature rise rate. In addition, although the rising speed is detected when the temperature rises in a certain temperature range, the rising speed may be determined based on the rising temperature per unit time. As described above with the example of a cake, for example, even for grilled fish, menus that want to be controlled with different heating times such as one fish, fillet, teriyaki, dried fish, etc. can be cooked as a unified sequence in the same way, There is a similar effect of grouping keys as one menu.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
1 will be described. The radiant heating means is constituted by a burner which burns gas at 36. Numeral 38 denotes an electromagnetic valve which turns on and off combustion in a burner 36 together with an igniter 39. 40
Is a pipe that forms a gas passage from the solenoid valve 38 to the burner 36. The case 41 is formed of a metal plate having a large number of small holes in order to supply air necessary for combustion, to exhaust combustion exhaust gas, and to prevent high frequency from being emitted outside the case. Reference numeral 42 denotes a reflecting plate which is provided at a position sufficiently distant to protect the infrared temperature sensor 10 from heat of combustion, and is provided to guide infrared rays radiated from the food 3 to that position. An example of cooking a sponge cake as a specific operation in this case will be described based on the flowchart of FIG. In the flowchart of FIG. 11, the numbers of the parts of FIG. 10 corresponding to the operations are given.

The user puts the cake dough in a mold, places it on the plate 16 and stores it in the cooking chamber 4, and selects a desired menu by using the menu selection key 6. Pressing the cooking start key 7 starts cooking the sponge cake. First, as a first step, the heating means selection unit 13 outputs a drive permission signal to the high-frequency heating control unit 14 to heat the entire dough, and the radiation heating control unit 1
5 outputs a drive inhibition signal to the high-frequency heating control unit 14.
Drives the magnetron 1 to perform high-frequency heating.

Sponge cake 3 with infrared temperature sensor 10
The high-frequency heating control unit 14 always drives the magnetron 1 at the maximum capacity until Tc> Tcs1. When Tc> Tcs1, the heating unit selection unit 1
Reference numeral 3 outputs a drive permission signal to both the high-frequency heating control unit 14 and the radiant heating control unit 15. From here, cooking is performed by combining the process of expanding the dough of the sponge cake 3 and the process of scorching the surface of the dough. The high-frequency heating control unit 14 reduces the capacity of the magnetron 1 and drives the magnetron 1 with a low capacity, and the radiant heating control unit 15 performs combustion with a burner 36. In order to perform combustion with the burner 36, the radiant heating control unit 15 discharges with the igniter 39, ignites by opening the electromagnetic valve 38, and ignites the igniter 40.
To stop. At this time, safety can be improved if ignition is confirmed with a frame rod or the like (not shown). In this process, the radiation heating control unit 15 controls the burner 36 to turn on and off the burner 36 based on the temperature Tr of the cooking chamber 4 that can be detected by the thermistor 11, so that the temperature of the cooking chamber 4 substantially maintains a predetermined temperature Trs. And is performed until Tc> Tcs3. To extinguish the burner 36, the solenoid valve 38 may be closed. Trs has a relatively high temperature of about 200 ° C. and may vary depending on the menu.

Although an example of cake cooking has been described above, the present invention can be applied to other cooking menus. In particular, in the case of grilling fish, the cooking time can be shortened, so that water and oil are not escaped and umami unique to fish is achieved. Good cooking can be left.
Also, the solenoid valve 38 is not an on / off control, but a proportional valve capable of adjusting the opening degree electrically and adjusting the combustion amount.
The combustion amount may be controlled according to the temperature difference from rs. In this case, the temperature can be finely controlled, and the finished state is improved. The same effect can be obtained by using forced air supply and exhaust instead of natural air supply and exhaust in the case of combustion air supply and exhaust.In this case, the degree of freedom in the position of air supply and exhaust is increased, and safety is the highest priority for the user. Becomes easier.

In the first to fifth embodiments described above, a case has been described in which one infrared temperature sensor is used to detect the temperature of food. However, this is not a limitation on the present invention, and a plurality of infrared temperature sensors may be used. Alternatively, the heating means may be controlled based on the temperature at which the temperature at a plurality of locations is detected by driving an infrared temperature sensor or the like and the maximum value, the minimum value, or the average value is subjected to statistical processing. In this case, the temperature can be accurately detected, and the finish of cooking can be improved.

[0059]

As is apparent from the above embodiment, according to the present invention, the infrared temperature sensor detects the temperature of the food in the cooking chamber, and the heating controller drives the high-frequency heating means using the detected temperature. Since the control or the drive control of the radiant heating means or the drive control of both is controlled, the progress of cooking can be detected based on the temperature of the food, and the food can be heated by the optimal heating means accordingly, thereby shortening the cooking time. .

Further, according to the present invention, the food temperature calculator selects an appropriate output of the food temperature detection circuit from a plurality of food temperature detection circuits corresponding to the respective temperature bands from low to high and calculates the food temperature. Therefore, it is possible to accurately detect the food temperature corresponding to a wide temperature range and improve the finish of cooking.

According to the present invention, the infrared temperature sensor detects the temperature of the food through the opening provided in the cooking chamber, and the opening / closing controller is provided in the opening during heating by the heating controller by the radiant heating means. By controlling the drive to close the switch,
Since the infrared temperature sensor and the cooking chamber are thermally shut off during the radiant heating, the infrared temperature sensor can be protected from heat and reliability can be improved.

According to the present invention, at the beginning of the cooking, the heating controller heats the food by the high frequency heating means until the temperature of the food in the cooking chamber detected by the infrared temperature sensor reaches a predetermined temperature, and detects the temperature rise rate. The cooking appliance detects the temperature rise rate, calculates the time required for radiant heating from the output, and the cooking completion determiner determines the completion of radiant heating based on the calculation result. Can be centrally detected based on the food temperature information, and the completion of cooking can be determined, so that the user can avoid troublesome menu selection and can improve the usability.

[0063]

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the cooking device.

FIG. 3 is a circuit diagram of a food temperature detecting device for explaining a cooking device according to a second embodiment of the present invention;

FIG. 4 is a circuit diagram of another example of a food temperature detecting device for explaining the cooking device;

FIG. 5 is a configuration block diagram of a heating cooker according to a third embodiment of the present invention.

FIG. 6 is a flowchart illustrating the operation of the cooking device.

FIG. 7 is a configuration block diagram of a heating cooker according to a fourth embodiment of the present invention.

FIG. 8 is a characteristic diagram showing a change in food surface temperature illustrating the cooking device;

FIG. 9 is a flowchart illustrating the operation of the heating cooker.

FIG. 10 is a configuration block diagram of a heating cooker according to a fifth embodiment of the present invention.

FIG. 11 is a flowchart illustrating the operation of the cooking device.

FIG. 12 is a block diagram showing a configuration of a conventional heating cooker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency heating means 2 Radiant heating means 3 Food 4 Cooking room 10 Infrared temperature sensor 12 Heating controller 17a, 17b Food temperature detection circuit 21 Food temperature calculator 27 Opening 28 Switch 30 Opening controller 31 Switch 32 High frequency heating end Judgment device 33 Temperature rise speed detector 34 Radiation time calculator 35 Cooking completion judgment device 36 Burner

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takuo Shimada 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shunichi Nagamoto 1006 Odaka Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co. In-house (56) References JP-A-58-13934 (JP, A) JP-A-2-263016 (JP, A) JP-A-3-134410 (JP, A) JP-A-60-32291 (JP, A) JP-A-52-79254 (JP, A) JP-A-59-138816 (JP, A) JP-A-61-133496 (JP, A) JP-A-4-332492 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F24C 7/02 330 F24C 7/02 531 F24C 1/02 320

Claims (3)

(57) [Claims] 1. A cooking chamber for storing food, high-frequency heating means for high-frequency heating the food in the cooking chamber, radiant heating means for radiantly heating the food in the cooking chamber, and radiation from the food in the cooking chamber. An infrared temperature sensor that thermoelectrically converts an amount of infrared light, a heating controller that controls the driving of the high-frequency heating unit and the radiant heating unit based on an output from the infrared temperature sensor, and a food product based on an output from the infrared temperature sensor.
A temperature rise rate detector for detecting a temperature rise rate of the
Operation time of radiant heating means from output of temperature rise rate detector
And a radiation time calculator for calculating the heating controller
The detection temperature of the infrared temperature sensor is set in advance
The high-frequency heating means was driven until a predetermined temperature was reached.
Later, from the temperature rise rate detected by the temperature rise detector,
The time calculated by the radiant time calculator, the radiant heating means
A cooking device controlled to be driven . 2. A plurality of food temperature detection circuits for detecting a temperature of food stored in a cooking chamber from an output of an infrared temperature sensor, and at least one of the food temperature detection circuits based on an output of the plurality of food temperature detection circuits. The cooking device according to claim 1, further comprising a food temperature calculator for selecting an output and calculating a temperature of the food. 3. A cooking room is provided with an opening in a path through which infrared rays radiated from the food reach the infrared temperature sensor, and a switch for opening and closing the opening, and the food is radiated by the radiant heating means by the output of the heating controller. The cooking device according to claim 1, further comprising an opening / closing controller that controls the driving of the switch to close the opening during heating.