JPH09145060A - Temperature measuring device and temperature measuring method using thermopile sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to always cook a material to be cooked at a desired temperature by providing a material-to-be-cooked temperature estimating unit for estimating the temperature of the material when the material has a small size and its temperature is scarcely detected. SOLUTION: A sensor section 100 for sensing the infrared rays radiated from the material 11 to be cooked on a turntable 12 in a heating chamber 10 has a condensing unit 33 for condensing the infrared rays to output it and a thermopile sensor 34 for sensing the condensed infrared rays to output a voltage. The route which is incident for the radiated infrared rays from the unit 33 makes it possible to be altered by a plane reflecting mirror 37 controlled by a plane reflecting mirror drive controller 40 according to the position of the material 11 recognized via a material-to-be-cooked position recognition unit 39. A heating driver 400 is controlled by a controller 200 by using the data from the section 100 to control the material 11 to a suitable temperature. When the material 11 is separated, the temperature is estimated by a material- to-be-cooked temperature estimating unit 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device and a temperature measuring method using a thermopile sensor, and more particularly to measuring a size and a position of an object to be cooked on a turntable to measure an accurate temperature of the object to be cooked. The present invention relates to a temperature measuring device and method using a thermopile sensor.

[0002]

2. Description of the Related Art FIG. 1 is a block diagram showing a configuration of a conventional temperature measuring device using a thermopile sensor.

Referring to FIG. 1, a temperature measuring device using a thermopile sensor according to the prior art is placed in the center of a heating chamber 10 so that an object 11 to be cooked can be placed, and a turntable 12 described above. A heating unit 13 for generating microwaves for heating the cooked food 11, and the heating unit 13
Drive unit 14 for controlling the turntable 12
To be cooked 11 in the heating chamber 10 through a temperature measurement hole located at the top of the heating chamber 10 corresponding to the side surface away from the center of the
A temperature detection position drive unit 1 including a thermopile sensor 15 for detecting the temperature of the thermopile, a stepping motor (not shown) for controlling the position of the thermopile sensor 15 to vary the temperature detection position, a timing belt (not shown), and the like.
6, the shielding portions 17 and 18 for shielding the temperature measurement holes when the thermopile sensor 15 cannot measure the temperature of the portion 11 to be cooked, and the cooling for operating the shielding portions 17 and 18 and cooling the thermopile sensor. Fan 19
The temperature of the object to be cooked is detected from the output of the thermopile sensor 15, and the temperature of the object to be cooked and the cooling fan control unit 20 for controlling the cooling fan; A determination unit 21 for determining whether or not each unit is operable from the output.

[0004] The operation of the temperature measuring apparatus using the thermopile sensor according to the prior art constructed as described above will be described as follows.

[0005] The thermopile sensor 15 averages all temperatures existing within the viewing angle and outputs a voltage. Therefore, when the object 11 is smaller than the sensor viewing angle, it is difficult to accurately measure the temperature of the object.

Accordingly, a driving section such as a stepping motor is connected to a thermopile sensor 15 having a narrow viewing angle, and the sensor is reciprocally rotated to change the temperature measurement range of the sensor. The method of determining the position of the object to be cooked while changing the position is as follows.

When the user selects the cooking start key after placing the food 11 on the turntable 12 located at the center of the heating chamber 1 of the microwave oven, the temperature of the food is detected and the fan control unit 20 recognizes it. After that, a drive signal for driving each unit is output to the determination unit 21.

The determination unit 21 to which the driving signal is applied first controls the heating unit 13 through the heating driving unit 14 to generate microwaves in the heating chamber 10, and the turntable 12 in the heating chamber 10 rotates. Start the turntable 1
The object to be cooked 11 positioned above 2 also starts to rotate.

When the turntable 12 starts rotating,
The determination unit 21 is configured so that the thermopile sensor 15 and the temperature detection position driving unit 16 operate continuously.

The thermopile sensor 15 measures the temperature while changing the position by driving the temperature detection position drive unit 16. When using a stepping motor that divides one reciprocating motion of the sensor into eight, the temperature is measured by the reciprocating motion of the sensor. The area is as shown in FIG.

If the temperature is measured while the reciprocating motion of the sensor is repeated while the turntable 12 makes one rotation, the temperature for all areas of the turntable 12 is measured.

However, it is assumed that one round trip of the sensor is divided into eight, so that the sensor
If the turntable 12 is reciprocated twice, the number of data measured during one rotation of the turntable 12 becomes 80, and this 80
160 data obtained by adding the position data of the turntable 12 corresponding to the temperature data are stored in the memory.

If the temperature measurement data of the sensor for two rotations of the turntable 12 and the turntable 1
By storing the position data of No. 2 and comparing the data of the first rotation with the data of the second rotation for each data, the temperature distribution with respect to the turntable 12 can be known.

If there is a portion where the temperature is significantly increased during the second rotation of the turntable 12 from the first rotation of the turntable 12, the object 11 may be located at the increased portion. Recognize. Further, the size of the object to be cooked 11 can be determined from the position data of the turntable 12 at which the temperature has significantly increased.

As described above, the temperature data measured while continuously reciprocating the thermopile sensor 15 using the stepping motor and the turntable 12 corresponding to the temperature data are measured.
When the position of the food 11 is grasped from the position data of the turntable 3, the temperature detection position driving unit 16 fixes the thermopile sensor 15 at the position of the food 11.
The temperature of the object to be cooked 2 can be measured for each rotation of.

The temperature of the object 11 is detected by a thermopile sensor 15, converted into an electric signal corresponding to the detected temperature, and supplied to the temperature detection and cooling fan control unit 20. The cooking object temperature detection and cooling fan control unit 20 averages the detected cooking object temperature and converts the averaged temperature into a voltage, which is output to the determination unit 21.

The judging section 21 calculates the heating time based on the temperature of the object to be cooked, and determines the heating section 1 in accordance with the calculated heating time.
3 is controlled to perform automatic cooking.

The cooking fan temperature detection and cooling fan control unit 20 outputs a control signal for cooling the cooling fan 19 if it is heated over time.

As described above, in the method of measuring the temperature of the object to be cooked using the thermopile sensor 15, the view angle of the sensor having a narrow view angle is placed on the side of the turntable 12, and a drive unit such as a stepping motor is used. The viewing angle of the sensor is reciprocated to the angle shown in FIG. 2 to search for the position of the object to be cooked 11, and the field of view of the sensor is fixed at the position where the object to be cooked 11 is present. The temperature of the object to be cooked can be measured.

[0020]

However, in the prior art as described above, in order for the thermopile sensor to accurately measure the temperature of any object, infrared light of the object to be measured is input to the sensor for at least 0.25 seconds or more. If so, the time during which the thermofile type viewing angle stays in each measurement area when moving the temperature measurement area of the sensor must be at least 0.25 seconds or more.

If the thermopile sensor is reciprocated, the field of view of the sensor is divided into eight with respect to the radius of the turntable and deformed. One turn of the turntable is 10 seconds, and the field of view of the sensor remains in each field of view. Time 0.2
When the reciprocating speed of the sensor is adjusted to 5 seconds, the rotation of the turntable and the temperature measurement position due to the reciprocating motion of the sensor change as shown in FIG.

At this time, e. Of the turntable in FIG.
When there is an object to be cooked at the position, the temperature data for the two rotations of the turntable and the corresponding position data of the turntable correspond to the seventh and eleventh temperature data of the area of the turntable where the temperature change is significantly changed. Part.

In this case, the object to be cooked is located at the d. And e. Positions apart from the center of the turntable, but the temperature measurement area of the sensor is most in contact with the object to be cooked during the seventh and tenth measurements. In other words, the cooking target at the d. And e. Positions of the turntable is mistakenly determined to be at the c. Position, and the detection position drive unit is controlled so that the viewing angle of the sensor is at the c. Position of the turntable. Then, there is a problem that cooking is finished at a temperature far higher than a desired temperature.

In other words, the conventional technique of reciprocating the sensor using a drive unit such as a stepping motor to determine the position and size of the object to be cooked while changing the measurement area of the sensor is the time response characteristic of the sensor. In addition, there is a problem that it is difficult to actually apply to the microwave oven because the rotation speed of the turntable is not considered.

When the temperature of the object to be cooked is measured while continuously reciprocating the sensor by using a detection position driving unit such as the stepping motor, the use of the stepping motor complicates the sensing structure. Therefore, there is a problem that it is difficult to apply a thermofile type infrared sensor to a microwave oven due to an increase in cost of a sensing device.

When the sensor is reciprocated by the driving unit such as the stepping motor, the structure for moving the sensor itself is not only a practically difficult problem, but also noise due to the movement of the sensor is generated. There are disadvantages that arise.

Accordingly, the present invention has been devised to solve the above-mentioned various problems of the prior art, and an object of the present invention is to fix a thermopile sensor and move the flat reflecting mirror to deform a sensing area. Temperature measurement using a thermopile sensor that enables a cooked object to be cooked to a desired temperature by placing a cooked object position determining unit that determines the position of the cooked object using the degree of change in the side surface temperature of the turntable. It is to provide an apparatus and a method.

[0028]

A temperature measuring apparatus using a thermopile sensor according to the present invention comprises a turntable which is placed at the center of a heating chamber and on which an object to be cooked can be placed;
A sensor unit for sensing infrared rays radiated from the object to be cooked in the heating chamber, a control unit for controlling each unit to properly cook using the data transmitted from the sensor unit, and an output from the control unit A reflector adjustment unit for recognizing the position of the object on the turntable based on the data and adjusting the plane reflecting mirror, and generating an electron wave for heating the object based on data output from the control unit. A heating drive unit for heating the food; and, when the size of the food is small, it is difficult to sense the temperature of the food, so that the temperature of the food can be estimated and the appropriate temperature of the food can be controlled. The above-mentioned object temperature estimating section is provided, whereby the above object is achieved.

In one embodiment, the sensor unit collects and outputs infrared rays radiated from the object to be cooked in the heating chamber, and detects and converts and outputs the infrared rays transmitted from the condensing unit. And a thermopile sensor.

In one embodiment, the control unit converts an analog signal transmitted from the thermopile sensor into digital data, and a cooking unit using the data transmitted through the analog / digital conversion unit. A microcomputer to control each part,
And a noise determination unit that determines whether or not electrical noise is generated from a sensing value transmitted through the microcomputer.

In one embodiment, the reflector adjusting unit is configured to recognize a position of the object to be cooked on the turntable based on sensor output data transmitted through the microcomputer, and to recognize the position of the object to be cooked through the microcomputer. A plane reflecting mirror driving control unit that outputs a driving signal based on the recognized position of the object to be cooked to the reflecting mirror driving unit; a plane reflecting mirror driving unit that is driven by the plane reflecting mirror; A flat reflecting mirror that changes a path through which the emitted infrared light is incident on the light collector.

In one embodiment, the flat reflecting mirror driving section includes a first solenoid and a second solenoid which are turned on / off under the control of the flat reflecting mirror driving control section, a solenoid support for supporting the first solenoid, A driving iron piece, a leaf spring, and a plane reflecting mirror which are moved by turning on / off the first solenoid and the second solenoid, and a rotation angle of the plane reflecting mirror which is limited by turning on / off the first solenoid and the second solenoid; And a rotation restricting plate for restricting the movement distance of the turntable area that can be sensed.

[0033] In one embodiment, the condensing section is formed of a convex lens or a concave reflecting mirror.

In one embodiment, the flat mirror driving unit is a first solenoid that is turned on / off under the control of the flat mirror driving control unit, a solenoid support that supports the first solenoid, and the first solenoid. The turning angle of the plane reflecting mirror is limited by turning on / off the driving iron piece, the leaf spring, and the plane reflecting mirror which are turned on / off, and the first solenoid is turned on / off, thereby restricting the moving distance of the turntable area which can be detected by the thermopile sensor. And a rotation limiting plate.

In one embodiment, the flat mirror driving unit controls the position of the flat mirror so that the thermopile sensor can measure the temperature of the center and side surfaces of the turntable.

In one embodiment, the temperature changes at the center and the side of the turntable are obtained by using the vibration width of the sensor output.

In one embodiment, the flat mirror drive control unit includes a switching unit that turns on / off a solenoid by an output of a microcomputer that outputs a drive signal for driving the flat mirror.

In one embodiment, the first solenoid and the second solenoid are designed to face each other with the same polarity.

In one embodiment, a permanent magnet is used instead of a leaf spring integrated with the driving iron piece and the plane reflecting mirror.

In one embodiment, the polarity of the permanent magnet and the polarity of the solenoid are designed to face each other with the same polarity.

In one embodiment, the driving iron piece, the leaf spring and the plane reflecting mirror are integrated. In one embodiment, the switching unit includes a resistor R1 and a first switch Q1 connected to a microcomputer, a resistor R2 and a resistor R3 connected in parallel to the first switch Q1, and a resistor R2 and a resistor R3 connected to the solenoid. And the second switch Q2.

In one embodiment, the first switch Q1 and the second switch Q2 use transistors.

In one embodiment, the switching section comprises a resistor and a switch connected between the microcomputer and the plurality of solenoids.

The temperature measuring method using the thermo-file sensor according to the present invention initializes the variable for recognizing the position of the object to be cooked at the start of cooking, and measures the temperature with respect to the sensor output voltage through the thermopile sensor and the analog / digital changing section. When the temperature calculation is completed in the first step, the time after the start of cooking is calculated, and when the cooking time is in the first section, the solenoid is turned off to measure the temperature change in the center of the turntable. If the cooking time is in the second section, the solenoid is turned on and the temperature change of the side surface of the turntable is measured, and if the cooking time is in the third section, the cooked food is cooked. The third step of comparing the temperature of the food with the temperature of the turntable, and the temperature change measured if the temperature of the food to be cooked in the third step is higher than the temperature of the turntable. Or physical object is in the heart, or which encompass a fourth step of determining whether the side portions, the object can be achieved.

In one embodiment, the first section of the second step is a time during which the temperature change at the center of the turntable can be sufficiently grasped.

In one embodiment, the second section for measuring the temperature change of the side surface of the turntable in the third step is one turntable rotation time.

In one embodiment, if the temperature of the food in the fourth step is lower than the temperature of the turntable, the determination of the position of the food is reserved until the temperature of the food becomes higher than the temperature of the turntable. And a step of measuring the temperature of the portion determined in the step.

[0048]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a temperature measuring apparatus and method using a thermopile sensor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a block diagram showing the configuration of a temperature measuring apparatus using a thermopile sensor according to the present invention.

Referring to FIG. 4, a temperature measuring apparatus using a thermopile sensor according to the present invention is a turntable 1 which is located at the center of a heating chamber and on which an object to be cooked can be placed.
2, a sensor unit 100 for sensing infrared rays radiated from an object to be cooked in the heating chamber 10, and a control unit 200 for controlling each unit so that cooking can be properly performed using data transmitted from the sensor 100. According to the data output from the control unit 200, the food 1 on the turntable 12 is
A reflector adjusting unit 300 that recognizes the position of the reflector 1 and adjusts the plane reflecting mirror 37, and generates an electronic wave to heat the object 11 based on data output from the controller 200, thereby controlling the object to be cooked. A heating drive unit 400 for heating and, when the size of the object to be cooked 11 is small, it is difficult to sense the temperature of the object to be cooked, so that the temperature of the object to be cooked can be estimated to control the appropriate temperature of the object to be cooked. Cooking object temperature estimation unit 4
And 4.

The sensor section 100 is a condensing section 33 composed of a convex lens or a concave reflecting mirror for condensing and outputting infrared rays radiated from the object 11 in the heating chamber 10, and transmitted from the condensing section 33. And a thermopile sensor 34 which detects infrared rays, converts them into a voltage, and outputs the voltage.

The control unit 200 includes a thermopile sensor 3
An analog / digital conversion unit 35 for converting an analog signal transmitted from 4 into digital data; a microcomputer 36 for controlling each unit to enable proper cooking using the data transmitted through the analog / digital conversion unit 35;
The noise determination unit 43 determines whether the noise is electrical noise based on the sensing value transmitted through the microcomputer 36.

The reflecting mirror adjusting unit 300 includes a flat reflecting mirror 37 for changing the path of the infrared rays radiated from the object 11 to be incident from the condensing unit 33, and a flat reflecting mirror driving unit for driving the flat reflecting mirror 37. 38, and a cooking object position recognition unit that determines whether the cooking object 11 is on the side surface or the center of the turntable 12 based on the temperature change data of each sensing area due to the rotation of the turntable 12 transmitted through the microcomputer 36. 39 and the cooking object position recognition unit 3
9 and the plane reflecting mirror 3 depending on the position of the object to be cooked
And a flat mirror drive controller 40 for controlling power supply to adjust the position of the mirror 7.

The heating control section 400 comprises a heating section 41 for generating an electron wave in the heating chamber 10 and a heating drive section 42 for controlling the driving of the heating section 41.

The operation of the temperature measuring apparatus using the thermopile sensor according to the present invention having the above-described structure will be described below.

When the user selects the cooking start key after placing the object 11 on the turntable 12 located in the center of the heating chamber 41 of the microwave oven, the microcomputer 36 recognizes this and selects the heating driving unit 42. To drive the heating unit 41.

When the heating unit 41 is driven to generate an electron wave in the heating chamber 10, the turntable 12 in the heating chamber 10 starts rotating, and the object to be cooked located on the turntable 12 is rotated. 11 also starts rotating.

If the object to be cooked 11 is cooked while rotating, infrared rays are emitted from the object to be cooked 11 and are incident on the condenser 33 through the infrared ray passing hole.

At this time, the path of the radiated infrared rays is changed so that the plane reflecting mirror 37 is incident on the condensing section 33. Next, the light collecting unit 33 formed of one of a convex lens and a concave reflecting mirror collects the emitted infrared light and sends it to the thermopile sensor 34.

At this time, the condensing unit 33 not only narrows the viewing angle of the sensor but also increases the output voltage of the sensor.

The condensing section 33 condenses the incident infrared rays and sends them to a thermopile sensor 34. The thermopile sensor 34 converts the infrared rays into a signal corresponding to an analog voltage value and sends the signal to an analog / digital conversion section 35. Output.

The analog / digital converter 35 converts analog data into digital data and converts the analog data into digital data.
6 is output.

If the data transmitted to the microcomputer 36 is output to the noise determination unit 43, the noise determination unit 43 determines whether the data is noise. If the data is noise, the data is not output. The data is output to the heating drive unit 42 and the object temperature estimating unit 44, respectively.

Therefore, the heating drive section 42 is
Is generated in the heating chamber 10 while controlling the temperature.

The cooking object temperature estimating section 44 estimates the temperature of the cooking object 11 when the cooking object 11 is far away from the thermopile sensor 34, and estimates the temperature of the cooking object 11.
The position of the object on which is located is recognized by the object position recognition unit 39.

The object-to-be-cooked position recognition section 39 is provided for the object-to-be-cooked 1.
The control signal is output to the flat mirror drive control unit 40 by the position recognition of (1).

The microcomputer 36 has a fixed focusing section 33.
In order to measure the temperature of the turntable 12 on which the object to be cooked 11 is located according to the position of the flat reflecting mirror 37 and the position of the flat reflecting mirror 37, a signal for changing the position of the flat reflecting mirror 37 is output.

Then, the thermopile sensor 34 changes to a region where the temperature can be measured depending on the position of the plane reflecting mirror 37.

That is, the plane reflecting mirror driving unit 38 adjusts the plane reflecting mirror 37 so that the plane reflecting mirror 37 moves toward the center or the side of the turntable 12 depending on the position of the object to be cooked.

In FIG. 5, the plane reflecting mirror driving section 38 includes a driving iron piece 47 integral with the plane reflecting mirror 37 and a driving iron piece 47 so that the thermopile sensor 34 can measure the temperature of a desired portion of the turntable 12. Leaf spring 4 to hold
6 and a first solenoid 49 for moving the driving iron piece 47.

The operation of the above-structured flat mirror driving section 38 will be described with reference to FIG.

When the plane reflecting mirror 37 is placed at the position A, the thermopile sensor 34 can measure the temperature at the center of the turntable 12, and when it is placed at the position B, it can measure the temperature on the side surface of the turntable 12. .

The microcomputer 36 controls the object-to-be-cooked position recognition unit 3.
When a control signal is output to the plane reflecting mirror drive control section 40 through 9, power is supplied to the first solenoid 49 of the plane reflecting mirror driving section 38 by the plane reflecting mirror drive control section 40.

Accordingly, a magnetic field is generated near the first solenoid 49, and a force is applied to the driving iron piece 47 integrated with the plane reflecting mirror 37, so that the driving iron piece 47 sticks to the first solenoid 49.

At this time, the flat reflecting mirror 37 is at the position B as shown in FIG. 6, and the infrared ray radiated from the side of the turntable 11 is incident on the thermopile sensor 34. Be able to measure temperature.

When the power supply is stopped, the driving iron 4
7 returns to the original position by the restoring force of the leaf spring 46 again.

When the plane reflecting mirror 37 is at the original position, the length of the rotation limiting plate 51 is determined so that the sensing area of the thermopile sensor 34 is located at the center.

The flat reflecting mirror 37 is at the position A in FIG. 6 and the infrared ray at the center of the turntable 12 is incident on the thermopile sensor 34.

Accordingly, the temperature at the center of the turntable 12 can be measured.

When the power is not supplied to the first solenoid 49 in the plane mirror driving unit 38 operating as described above, the rotation limiting plate 51 limits the rotation angle of the plane mirror 37.

Further, the rotation limiting plate 51 limits the moving distance of the turntable 12 which can be detected by the thermopile sensor 34.

Further, it can be seen that the temperature sensing area of the thermopile sensor 34 is moved by the rotation angle of the plane reflecting mirror 37 of FIG. 4, but as shown in FIG. 7, the rotation angle α of the plane reflecting mirror 37 and the thermopile sensor The sensing area movement distance d of 34 has the following relationship.

FIG. 8 shows the moving distance of the thermopile sensor 34 depending on the rotation angle of the plane reflecting mirror 37 when the height of the heating chamber 10 of the microwave oven is 23 cm.

If the rotation angle of the plane reflecting mirror 37 is 5 °, the temperature measuring area of the thermopile sensor 34 is moved by 4 cm, and if the plane reflecting mirror 37 rotates 7.5 °, the temperature measuring area is 6.16 cm, 10 °. Then move 8.37 cm.

The flat mirror drive control section 40 turns on or off by the output of the microcomputer 36 which outputs a drive signal for driving the flat mirror 37 as shown in FIG. It comprises a power switch 40a for supplying or shutting off. That is, when the microcomputer 36 outputs a high level of 5V, the transistor Q1 of the power switch 40a is turned on and bypassed to the ground side, so that the voltage applied to the base of the transistor Q2 becomes 0V.

Accordingly, the transistor Q2 is also turned on, and power is supplied to the first solenoid 49. When the microcomputer 36 outputs a low potential of 0 V, the transistor Q1 of the power switch 40a is turned off.

Further, current stops flowing to the base of the transistor Q2, and the transistor Q2 is turned off.

Accordingly, power is not supplied to the first solenoid 49, and the thermopile sensor 34 senses the temperature at the center of the turntable 12.

When the cooking object position recognition section 39 starts cooking, the cooking object 11 is located at the center of the turntable 13 or on the side of the turntable 13 based on the temperature change data of each sensing area due to the rotation of the turntable 12. Determine if there is.

If the object to be cooked 11 is on the side surface of the turntable 12, the microcomputer 36 outputs a high level of 5V in a fixed manner so as to operate the flat mirror drive control section 40.

The output voltage is fixedly directed by the flat reflecting mirror 37 to the side surface of the turntable 12, and if the cooking target 11 is in the center of the turntable 12, the microcomputer 36 fixes a low level of 0V. Output.

Accordingly, since the first solenoid 49 does not operate, the plane reflecting mirror 37 is fixedly directed toward the center of the turntable 12.

Although the output of the thermopile sensor 34 changes while vibrating due to the rotation of the turntable 12, if the turntable 12 rotates once every 10 seconds, only when the object 11 is in the vicinity of the thermopile sensor 34, The temperature of the object to be cooked can be sensed.

Further, since the temperature of the object to be cooked estimating section 44 can increase a lot in 10 seconds in the case of a small object to be cooked, even when the object to be cooked 11 is far from the thermopile sensor 34, the temperature of the object to be cooked can be increased. The temperature of the object to be cooked 11 is estimated so that the appropriate temperature of the object to be cooked 11 can be controlled.

The microwave oven cooks food using a high-output electron wave (microwave), and a thermopile sensor 3
4 outputs a minute voltage, so that noise due to an electron wave is generated in the output of the sensor.

Accordingly, the noise determination section 43 determines whether the signal transmitted through the analog / digital converter 35 is noise.

The noise mode is such that the temperature of the object to be cooked is simply increased when the object to be cooked 11 is heated by the heating unit 41, or the noise is vibrated by turning on / off the heating unit 41 or the heating unit 41 is turned off. Is determined to appear in a simple decreasing form.

FIG. 10 is a structural view showing another embodiment of the driving unit of the plane reflecting mirror of FIG. 4, and is a plate spring 46 holding a driving iron piece 47 integrated with the plane reflecting mirror 37, and can be moved to the left and right. The first solenoid 49 includes an iron core and moves the driving iron piece 47, and includes a second solenoid 49a that adjusts the movement of the first solenoid iron core 48.
When supplying power to all the second solenoids 49a that adjust the movement of the solenoid iron core 48, two solenoids 49 are used.
The operations of 49a and the plane reflecting mirror 37 are as follows.

In the microcomputer 36 shown in FIG. 11, 0 V is applied to the switching section 40b through the two output ports P1 and P2.
Is output, the current stops flowing to the bases of the transistors Q1 and Q2, and the transistors Q1 and Q2 are turned off.

Therefore, no power is supplied to the first solenoid 49 and the second solenoid 49a, and the driving iron 47
13A is directed toward the center of the turntable 12 as shown in FIG. 13A, so that the thermopile sensor 34 measures the temperature of the center of the turntable 12.

If the microcomputer 36 of FIG. 11 outputs a high level only to the two output ports P1, the transistor Q1 is turned on, so that the first switch SW1 of FIG. 10 is turned on, and the transistor Q2 is turned off. The second switch SW2 in FIG. 10 is turned off.

The iron core 48 inside the first solenoid 49 is moved in the direction of the iron piece of the second solenoid 49a, and at the same time, the driving iron piece 47 integrally formed with the plane reflecting mirror 37 is also moved by the first solenoid 49. Will stick to the iron core 48.

Accordingly, the plane reflecting mirror 37 is arranged as shown in FIG.
And the thermopile sensor 34 measures the temperature of the outermost surface of the turntable 12.

When the microcomputer 36 of FIG. 11 outputs 5 V to the two output ports P1 and P2 and turns on all the transistors Q1 and Q2 of the switching section 40b, the first and second switches SW1 and SW1 of FIG. SW2 is turned on.

At this time, the first solenoid 49 and the second solenoid 49a form magnetic fields of opposite polarities.

The iron core 48 of the first solenoid 49 is
When the plane reflecting mirror 37 is pushed by the solenoid 49a,
Is placed on B.

Therefore, the thermopile sensor 34 measures the temperature of a part slightly off the center of the turntable 12.

FIG. 12 is a structural view showing still another embodiment of the plane reflecting mirror driving section of FIG. 4, and includes a permanent magnet 52 integral with the plane reflecting mirror 37 and a rotating member for holding the permanent magnet 52. It is composed of a shaft 53.

When the power is supplied to the first solenoid 49, the polarity of the permanent magnet 52 is made to match the polarity of the first solenoid 49 and the polarity of the permanent magnet 52.

When the leaf spring 46 is used to control the position of the plane reflecting mirror 37, the elasticity of the leaf spring 46 is changed by turning on / off a number of first solenoids 49.

Therefore, by using the permanent magnets 52 to solve the problem of reducing the reliability of the thermopile sensor 34, the life and reliability of the sensing device can be improved.

The operation of the permanent magnet 52 and the first solenoid 49 is performed when power is not supplied to the first solenoid 48.
Solenoid iron piece 4 integrated with solenoid 49
8 causes the permanent magnets to stick together.

The flat reflecting mirror 37 is directed to the side surface of the turntable 12, and the thermopile sensor 34 measures the temperature of the food on the turntable 12. When power is supplied to the first solenoid 49, the permanent magnet 52
A polarity equal to the polarity of

As a result, the permanent magnet 52 moves away from the first solenoid 49, and the plane reflecting mirror 37 integrated with the permanent magnet 52 eventually moves toward the center of the turntable 12. Measure the temperature at the center.

FIG. 14 is a graph showing the temperature change characteristics of the object to be cooked and the turntable for explaining the basic principle for recognizing the position of the object to be cooked. It is a temperature change curve of the to-be-cooked thing mounted on the turntable at the time of heating.

That is, it can be seen that when heating the object to be cooked at the same time, the temperature increase of the object to be cooked is faster than the temperature increase of the turntable.

Accordingly, the object to be cooked 11 and the turntable 1
The position of the object to be cooked 11 can be recognized by using the difference due to the temperature increase of 2.

Before explaining the recognition position of the object to be cooked based on FIG. 16, a timing chart for judging the position of the object on the turntable as shown in FIG. 15 is as follows. .

In FIG. 15, T _p is a cycle time (hereinafter, referred to as a sensing cycle time) in which both the center and the side of the turntable 12 are alternately sensed by the thermofile sensor 34, and j is an elapsed time after the start of cooking ( the following is a cooking start elapsed time referred to as), k is the j from j t _p
This is the value obtained by subtracting the quotient divided by R.
The time from 0 to k = 1 and the turntable 42
Is a section for sensing the temperature at the center of the area, and the R2 time zone is from k = k1 (hereinafter, referred to as a first section) to k = k2.
(Hereinafter referred to as a second section), which is a section for sensing the temperature of the side surface of the turntable 12, and t _c is the minimum elapsed time after the start of cooking in which the position determination algorithm of the object to be cooked is performed. (Hereinafter, referred to as a minimum elapsed time) and k3 (hereinafter, referred to as a third section) determine the position of the article to be cooked 11 from the temperature data of the center and side surfaces of the turntable 12 and determine the position of the flat reflector driving unit 38. 1 solenoid 4
9 shows a time point at which the sensing area of the thermo file sensor 34 is determined by operating the thermocouple 9.

[0120] The value of the t _p is set to twice the one rotation time of the turntable 12.

Therefore, if one turn of the turntable 12 is 10 seconds, t _p is set to 20 seconds.

The value of k1 is determined by the thermo file sensor 34.
Sets the time during which the temperature change at the center of the turntable 12 can be sufficiently grasped. When the object to be cooked 11 is at the center of the turntable, the output of the sensor ideally does not vibrate but simply increases. .

Therefore, the value of the first section k1 is set to be shorter than one rotation time of the turntable 12, but 5 seconds is appropriate.

The value of the second section k2 sets one rotation time of the turntable 12 in order for the thermofile sensor 34 to sufficiently grasp the temperature change on the side surface of the turntable 12. Therefore, if one rotation time of the turntable 12 is 10 seconds, the value of the second section k2 is set to 10 seconds.

[0125] To set a value between the value of the third section and k3 k2 and t _p, a t _p = 20 seconds, k3 if k2 = 15 seconds set a value from 15 seconds to 20 seconds I do.

[0126] The t _c is cooking after the start of the turn table 12
Set of smaller than twice the t _p is an alternating sensing period of the central and side portions.

[0127] For example, t _p = 20 seconds, k1 = 5 seconds, k3
= If 18 seconds, t _C is t _p + k3 at 35 seconds of t _p + k2
38 seconds is appropriate.

Referring to FIGS. 16 and 17, the recognition of the position of the object to be cooked based on the above-described variables and time, when the user of the microwave oven presses the cooking start key, the microcomputer 36 performs the position recognition of the object to be cooked. Initialize variables (S101),
The solenoid of the flat mirror driving unit 38 is turned off, and the heating unit 41 such as a magnetron is operated.

As the heating unit 41 operates, the object to be cooked 11 located on the turntable 12 heats and emits the infrared light which is radiated through the condenser unit 33, the thermofile sensor 34 and the analog / digital converter 35. The input sensor output voltage is converted into the current temperature T (S102).

[0130] Then, a variable value k using the sensing period time t _p stored in the internal memory of the microcomputer 36 from the cooking start elapsed time after j as _{k = j-j / t p} (S103) It is determined whether the value of the variable flag is 0 (S104).

If the flag value is "1", it is determined that the position of the object to be cooked has been recognized, and the heating control algorithm is executed (S105).

If the flag value is "0", the variable value k
Is checked from 0 to the first section k1 (S106), that is, if it is in the R1 time zone, the first solenoid 49 is turned off, and the temperature of the central portion of the turntable 12 is sensed (S107). Minimum temperature T
cmin (S108), (S110) and maximum temperature Tcm
ax (S109) and (S111) are calculated, and the calculated maximum temperature Tcmax and the maximum temperature Tpcmax stored in the memory are different from each other by Tc, Tc = Tcmax-Tpcm.
ax is calculated (S112).

When the variable value k is in the first section k1 and the second section k2 (S113), that is, in the R2 time zone, the first solenoid 49 is turned on to sense the temperature of the side surface of the turntable 12 ( S114) The time zone R
2, the difference Ts between the minimum temperature Tsmin and the maximum temperature Tpsmax stored in the memory Ts, Ts = Tsmax
-Tpsmax, maximum temperature Tsmax, and minimum temperature Tsm
The difference Tsv from T.in, Tsv = Tsmax−Tsmin, is calculated (S119), (S120).

[0134] is stored in the memory to the maximum temperature and the minimum temperature value in the Tpcmax and Tpsmax previous sensing cycle time t _p (S121).

If the value of the variable k is the third section k3, (S
122), the elapsed time after the start of cooking to determine the position of the greater than the minimum elapsed time t _c stored in the memory (S123) the food.

That is, the first process for determining the position of the object to be cooked is to compare the temperature of the object to be cooked 11 with the temperature of the turntable 12 so that the temperature of the object to be cooked 11 is higher than the temperature of the turntable 12. It is determined whether the temperature is high or low, and the position of the food is not determined until the temperature of the food becomes higher than the temperature of the turntable.

When the initial temperature of the object to be cooked 11 is higher than or similar to the initial temperature of the turntable 12 as shown in FIG. 18B, it can be seen that the vibration width increases as the cooking time elapses. The initial temperature of the turntable 12
If the temperature is lower than the initial temperature, the vibration width of the sensor output decreases until the temperature of the turntable and the temperature of the object to be cooked become similar, and then increases again, as shown in FIG.

Accordingly, T, which means the vibration width of the sensor output,
By comparing sv and Tpsv, the increase or decrease of the vibration width can be determined. Based on the increase or decrease of the vibration width, it can be determined whether or not the current time can recognize the position of the object to be cooked.

[0139] Here, the maximum temperature and the minimum temperature down differences in Tpsv previous sensing cycle time t _p (Tsmax-
Tsmin) stored in the memory as the value Tsv.

If the object to be cooked 11 is placed at the center of the turntable 12, the vibration of the sensor output hardly occurs, so that the difference between the previous cycle and the current maximum and minimum temperatures, Tsv and Tpsv, is determined. By comparison, it can be determined whether or not the object to be cooked 12 is at the center of the turntable 12.

Therefore, Ts is used to determine the position of the object to be cooked.
If Tsv is larger by comparing v with Tpsv (S12
5), currently recognized as the temperature of the food 11 is above or similar than the temperature of turntable 12, and the change in T _C between the maximum temperature at which the thermo file sensor 16 to sense the central portion of the turntable 12 sensor 16 compares the difference Tc to Ts of the variation Ts between the maximum temperatures when sensing the side surface of the turntable 12 with a constant c1 stored in the memory.

As a result of this comparison, the difference between the maximum temperature changes (Tc
If (−Ts) is larger than the constant c1 (S127), it means that the temperature change at the center of the turntable 12 is large, and thus the object to be cooked 11 is
2 and the first solenoid 49
And the thermo file sensor 34 senses the center of the turntable 12 (S128).

Then, the difference (Tc-T
If s) is smaller than the constant c1, it means that the temperature change at the side surface of the turntable 12 is large.
Recognizing that the object to be cooked 11 is located on the side surface of the turntable 12, the solenoid 23b is turned off, and the thermofile sensor 16 senses the side surface of the turntable 12 (S129).

Here, ideally, the value of the constant c1 stored in the memory is set to 0. However, the sample 11 is located on the side of the turntable 12, and the temperature of the sample is sampled. If the time is not sufficiently short, the value is set in consideration of the fact that the maximum temperature of the object to be cooked 11 cannot be accurately sensed as shown in FIG.
= 0.1 is set.

If the Tsv is smaller than the Tpsv, the food 1 located on the side of the turntable 12
1 if the current temperature is lower than the temperature of the turntable 12, or a small sensing error with respect to the irregularly shaped object 11 located at the center of the turntable 12 or the object 11 located at the center of the turntable 12. Tsmax and Tsmi are determined by using the value of the constant c3 stored in the memory to distinguish between the two cases.
The magnitude of n + c3 is compared.

[0146] Here, Tpsmax is the maximum value of the side surface temperature of the turntable 12 between the previous sensing cycle time t _p, Tsmax current sensing cycle time t _p
, The output of the thermofile sensor 34 does not oscillate ideally when the object to be cooked 11 is located at the center of the turntable 12, but simply increases, so that Tsmin is always obtained. Is T
It becomes larger than psmax.

However, actually, even when the object to be cooked is located at the center of the turntable due to the shape of the object to be cooked or a minute change in the sensing position, the output of the sensor vibrates when sensing the side surface of the turntable. In consideration of the above, the value of the constant c2 is set. Here, the value of the constant c2 is set to 3.

As a result of the comparison between Tpxmax and Tsmin + c3, if Tpsmax is greater than Tsmin + c3, it is determined that the current temperature of the object to be cooked 11 is lower than the temperature of the turntable 12; The determination of the position of the object to be cooked is reserved until it becomes larger.

The Tpsmax is equal to Tsmin +
If it is smaller than c3, the object to be cooked 11 is the turntable 12
Is determined to be located at the center of the turntable, the solenoid is turned off, and the temperature of the center of the turntable is sensed (S13).
0).

If the position of the food 11 is determined by the above method, the variable flag is given a value of "1" so that the position recognition algorithm of the food is not executed again (S13).
2).

If the operation so far is briefly re-examined,
As the heating unit 41 is operated, the object to be cooked 11 located on the turntable 12 is heated, and infrared rays emitted while being heated are input through the condenser unit 33, the thermofile sensor 34, and the analog / digital converter 35. The output voltage is converted to the current temperature T.

[0152] Then, obtained from cooking start elapsed time after j to the value of a variable k by using the sensing period time t _p stored in the internal memory of the microcomputer 36 of the k = j-j / t _p, flag Check the value.

If it is determined whether the flag value is 1 or 0, and if the flag is "0", the variable value k is checked. If the value is in the range from 0 to k1, the first solenoid 49
Is turned off, and the maximum temperature Tcmax and the minimum temperature Tcmin in the section are calculated while sensing the temperature at the center of the turntable 12.

The difference Tc, T between the calculated maximum temperature Tcmax and the maximum temperature Tpcmax stored in the memory.
Calculate c = Tcmax−Tpcmax.

If the variable value k is between the k1 section and the k2 section, the first solenoid 49 is turned on to sense the temperature of the side surface of the turntable 12, and the maximum temperature Tsmax and the minimum temperature in that section are detected. Temperature Tsm
Calculate in.

The difference between the calculated maximum temperature Tsmax and the maximum temperature Tpsmax stored in the memory (Ts =
Tsmax−Tpsmax), and the difference between the maximum temperature Tsmax and the minimum temperature Tsmin (Tsv = Tsm).
ax-Tsmin).

Also, the value of the variable k exists in the third section k3,
If cooking start after the elapsed time is greater than the minimum elapsed time t _c which is stored in the memory, to compare the Tsv and Tpsv to determine the position of the food.

As a result of the comparison, if the temperature is larger than Tsv, it is recognized that the temperature of the object to be cooked 12 is higher than or similar to the temperature of the turntable 12 and the thermo file sensor 34 senses the center of the turntable 12 when sensing. The change part Tc between the maximum temperatures and the sensor 16 are the turntable 1
The change T between the maximum temperatures when sensing the side surface part 2
a constant c1 that stores the difference (Tc−Ts) in the memory
Compare with

Therefore, the difference (Tc−
If Ts) is larger than the constant c1, it is recognized that the object to be cooked 11 is located at the center of the turntable 12, and the first solenoid 49 is operated so that the thermofile sensor 34 senses the center of the turntable 12,
If the difference Tc-Ts for the maximum temperature change is smaller than the constant c1, it is recognized that the object to be cooked 11 is located on the side of the turntable 12, the first solenoid 49 is turned off, and the thermo file sensor 34 is turned on by the side of the turntable 12. Sensing.

As a result of this comparison, Tsv is equal to Tpsv
If smaller, the value of Tpsmax and Tsmin + c3 are compared again using the value of the constant c3 stored in the memory.

If Tpsmax is equal to Tsmin + c
If the value is larger than 3, it is determined that the current temperature of the food 11 is lower than the temperature of the turntable 12, and the position of the food is determined until the temperature of the food 11 becomes higher than the temperature of the turntable 12. Reserve

Further, the Tpsmax is equal to Tsmin + c
If it is smaller than 3, the object to be cooked 11 is the turntable 12
Is determined to be located at the center of the turntable, and the solenoid is turned off to sense the temperature at the center of the turntable.

If the position of the object to be cooked 11 is determined by the above-described method, a value of "1" is given to the variable flag so that the algorithm for recognizing the position of the object to be cooked is not performed again.

When the position of the object to be cooked 11 is recognized as described above, the object to be cooked position recognition section 39 sends a driving signal based on the position of the object to be cooked to the plane reflecting mirror driving section 38 through the plane reflecting mirror drive control section 40. Output.

The flat reflecting mirror driving section 38 includes the flat reflecting mirror 3.
7 is driven and fixed in accordance with the position of the object to be cooked.

Then, if the infrared ray radiated from the object to be cooked 11 is incident on the flat reflecting mirror 37 after changing the path of the infrared ray to the condenser section 33, the condenser section 33 collects the input infrared ray. And transmitted to the thermo file sensor 34, and the subsequent operations are repeated in the above-described process.

Then, another embodiment for recognizing the position of the object to be cooked will be described with reference to FIGS.

In FIG. 19, A and B are temperature sensing areas of the thermo file sensor 34 by the action of the plane reflecting mirror 37, that is, in FIG.
The temperature sensing area corresponding to the position B is shown,
a shows the case where the small object is located at the center of the turntable, b shows the case where the small object is located between the center and the side of the turntable, and c shows the case where the small object is located on the turntable. It shows the case where it is located on the side of.

In the case of a large cooked object, since it exists over a wide portion of the turntable, it is not necessary to have the accuracy of the position recognizing section 39 of the cooked object for measuring the temperature of the cooked object, but as shown in FIG. For a small cooked object, the exact position of the cooked object should be recognized in order to match the sensing area of the thermo file sensor 34 with the position of the cooked object.

At this time, when the sensing area of the thermo file sensor 34 is A, the sensor output does not fluctuate due to the rotation of the turntable 12, while the sensing area is B.
In this case, the sensor output curve differs depending on the position of the article 11 to be cooked.

FIG. 20 is a diagram showing a change in the sensor output depending on the position of a small object to be cooked. The closer the object to be cooked 11 is to the center of the turntable 12, the larger the vibration width is as b. As the distance increases, the vibration width decreases as indicated by c.

Referring to FIGS. 19 and 20, another embodiment will be described.
The sensor output voltage input through the digital converter 35 is calculated as the current temperature T, and the current time is checked. If the current time is in the R1 section between t1 and t2 as shown in FIG. Then, the first solenoid 49 is turned on, and the side surface temperature of the turntable 12 is measured.

The maximum value Tmax and the minimum value Tmin of the measured side surface temperature are calculated, and the variable B for calculating the signal width of the sensor output in the section R3 is calculated from the first variable value K1 stored in the memory. It is calculated as follows.

B = (Tmax−Tmin) * K1 Here, the first variable value K1 is set in consideration of the sampling time and the rotation speed of the turntable. When the difference between the temperature of the object to be cooked and the temperature of the turntable is small so as not to change, the value is set small enough not to ignore the vibration of the sensor output.

The cooking time R between the times t2 and t3
If there are two sections, the heating unit 41 and the first solenoid 49 are turned off, the central temperature of the turntable 12 is measured, and the average value Tc of the measured central temperatures is calculated.

[0176] In addition, the cooking time is t3 + t _d and t4 + t _d
If it is in the R3 section between them, the heating part 41 is turned off and the first solenoid 49 is turned on to turn on the side surface temperature T1 of the turntable 12.
Is measured, and the number of times when the difference between the side surface temperature T1 and the center temperature Tc of the turntable is larger than B is counted, and the variable Cn is counted.
The maximum value Tdmax of the difference between the side surface temperature T1 and the center temperature Tc of the turntable is calculated.

If the maximum value Tdmax of the difference between the calculated side surface temperature T1 and the center temperature Tc of the turntable is larger than the second variable value k2, the value of Cnt is compared with k5 and k6, and CNT becomes k5 and k6. If the value is in the range, the first solenoid 49 is turned off to sense the central portion of the turntable 12, or the first solenoid 49 is turned on to sense the side surface of the turntable 12.

Here, k5 and k6 are related to the sampling time of the microcomputer 36 and one rotation time of the turntable. If a small object is located on the side of the turntable, the time during which the temperature of the object is sensed. Is less than half of one turn of the turntable.

For example, one rotation time of the turntable is 1
If the sampling time of the microcomputer 36 is 0 second and the sampling time of the microcomputer 36 is 1 second, the time during which the temperature of the small object located on the side surface of the turntable 12 is sensed is less than 10 seconds to 5 seconds.

Therefore, the value of k6 is set so as to be half of one turn time of the turntable.

Although the sensor output can slightly vibrate depending on the shape and type of the object to be cooked even when the object to be cooked 11 is located at the center of the turntable, the value of k5 is set in view of the minute vibration.

[0182] If the maximum value Tdmax difference of the central temperature Tc of the side temperature T1 and the turntable is less than the second variable value k2, initialized t _d to k3 to 0, B calculated by R1 interval knt, Cnt is reset to 0, and t _d
After time, the algorithm of the R3 section is performed again.

[0183]

As described above, according to the present invention, the position of the object to be cooked on the turntable can be accurately determined using the plane reflecting mirror, so that the object to be cooked can be cooked at a desired temperature.

Further, the temperature of a small object to be cooked on the turntable can be accurately measured, and the structure is simple and the microwave oven can be manufactured at low cost by using a plane reflecting mirror.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a temperature measuring device using a thermofile sensor according to a conventional technique.

FIG. 2 is a temperature measurement area diagram when a thermo file sensor reciprocates on a turntable to search for a position of an object to be cooked.

FIG. 3 is an area diagram showing actual sensing when changing a sensing area using a thermo file sensor.

FIG. 4 is a block diagram showing a configuration of a temperature measuring device using a thermofile sensor according to the present invention.

FIG. 5 is a structural diagram showing an embodiment of a flat reflecting mirror driving section of FIG. 4;

FIG. 6 is a diagram illustrating a change in a temperature measurement area according to the position of the plane reflecting mirror in FIG. 4;

FIG. 7 is a conversion diagram of a sensor sensing area center according to a rotation angle (α) of the plane reflecting mirror of FIG. 4;

FIG. 8 is a table showing the movement distance of the center of the sensor sensing area when the height of the cavity of the microwave oven is 23 cm.

FIG. 9 is a control circuit diagram of the flat reflecting mirror driving section of FIG. 5;

FIG. 10 is a structural view showing another embodiment of the flat mirror driving unit of FIG. 4;

FIG. 11 is a control circuit diagram of the flat reflecting mirror driving section of FIG. 6;

FIG. 12 is a structural view showing still another embodiment of the flat mirror driving unit of FIG. 4;

FIG. 13 is a diagram illustrating a change in a temperature measurement area depending on the position of the plane reflecting mirror in FIG. 6;

FIG. 14 is a temperature change characteristic diagram of a cooked object and a turntable for explaining a basic principle for recognizing a position of the cooked object.

FIG. 15 is a timing diagram for recognizing a position of a cooking target according to the present invention.

FIG. 16 is an operation flowchart for a temperature measuring method using the thermofile sensor of the present invention.

FIG. 17 is an operation flowchart for a temperature measurement method using the thermofile sensor of the present invention.

18A and 18B are graphs showing changes in sensor output when an object to be cooked is located on the side surface of the turntable, and FIG. 18A is a graph showing changes in sensor output when the initial temperature of the object to be cooked is lower than the temperature of the turntable. (B) is a sensor output change graph when the initial temperature of the object to be cooked is higher than the temperature of the turntable, and (c) is a sensor output change graph according to the sampling time for the object to be cooked positioned on the side surface of the turntable. is there.

FIG. 19 is an explanatory diagram showing a form in which a subject is located in a sensing area.

FIG. 20 is a graph showing changes in sensor output depending on the position of a small object to be cooked.

FIG. 21 is a timing chart for recognizing the position of an object to be cooked.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heating chamber 11 Cooking object 12 Turntable 33 Light condensing part 34 Thermofile sensor 35 Analog / digital conversion part 36 Microcomputer 37 Planar reflecting mirror 38 Flat reflecting mirror driving part 39 Cooking object position recognition part 40 Flat reflecting mirror driving control part Reference Signs List 41 heating unit 42 heating drive unit 43 noise determination unit 44 cooking object temperature estimation unit 46 leaf spring 47 drive iron piece 48 solenoid iron core / iron piece 49, 49a first and second solenoids 50 solenoid support table 51 rotation limiting plate 52 permanent magnet 53 Rotary axis

Claims (21)

[Claims] 1. A turntable which is placed at the center of a heating chamber and on which an object to be cooked can be placed, a sensor unit for sensing infrared rays radiated from the object to be cooked in the heating chamber, and transmitted from the sensor unit A control unit for controlling each unit so that cooking can be properly performed using the data obtained from the control unit; and a reflecting mirror adjustment for recognizing a position of an object to be cooked on a turntable based on data output from the control unit and adjusting a flat reflecting mirror. A heating drive unit that generates an electron wave to heat the object to be cooked based on data output from the control unit, and that the temperature of the object to be cooked is small when the object to be cooked is small. A thermopile sensor comprising: a cooking object temperature estimating unit configured to estimate the temperature of the cooking object by making it difficult to perform sensing and to control an appropriate temperature of the cooking object. Temperature measurement device. 2. The light sensor according to claim 1, wherein the sensor unit is configured to collect and output infrared rays radiated from an object to be cooked in the heating chamber, and a thermopile configured to sense, convert, and output the infrared rays transmitted from the condenser unit. The temperature measurement device using the thermopile sensor according to claim 1, comprising a sensor. 3. The control unit includes: an analog / digital conversion unit that converts an analog signal transmitted from the thermopile sensor into digital data; and a control unit configured to cook properly using the data transmitted through the analog / digital conversion unit. The thermopile according to claim 1, further comprising: a microcomputer for controlling; and a noise determination unit that determines whether or not the electrical noise is generated when the electrical noise is generated based on a sensing value transmitted through the microcomputer. Temperature measurement device using a sensor. 4. The reflector adjusting unit is configured to recognize a position of an object to be cooked on a turntable based on sensor output data transmitted through a microcomputer, and an object recognized through the object position recognition unit. A plane reflector drive controller that outputs a drive signal based on the position of the food to the reflector drive unit; a plane reflector drive unit that is driven by the plane reflector; and the reflector adjuster is radiated from the object to be cooked. 2. The temperature measuring device using a thermopile sensor according to claim 1, further comprising: a flat reflecting mirror that changes a path through which the infrared ray is incident on the light collecting unit. 5. The flat mirror driving unit includes a first solenoid and a second solenoid which are turned on / off under the control of a flat mirror driving control unit, a solenoid support for supporting the first solenoid, and a first solenoid. A driving iron piece, a leaf spring, and a plane reflecting mirror that are moved by turning on / off a solenoid and a second solenoid, and a rotation angle of the plane reflecting mirror is limited by turning on / off the first solenoid and the second solenoid, so that a thermopile sensor can sense. 2. The temperature measuring device using a thermopile sensor according to claim 1, further comprising a rotation limiting plate for limiting a moving distance of the turntable region. 6. The temperature measuring device using a thermopile sensor according to claim 2, wherein the light condensing part is formed of a convex lens or a concave reflecting mirror. 7. The flat reflecting mirror driving section includes a first solenoid that is turned on / off under the control of a flat reflecting mirror driving control section, a solenoid support that supports the first solenoid, and an on / off state of the first solenoid. Drive iron piece that moves by off,
A plate spring and a plane reflecting mirror, and a rotation restricting plate for restricting a rotation angle of the plane reflecting mirror by turning on / off the first solenoid to restrict a moving distance of a turntable area that can be detected by a thermopile sensor. A temperature measuring device using the thermopile sensor according to claim 4. 8. The flat mirror driving unit according to claim 4, wherein the flat mirror driving unit controls the position of the flat mirror so that the thermopile sensor can measure the temperature of the center and the side of the turntable. Temperature measuring device using a thermopile sensor. 9. The temperature measuring device using a thermopile sensor according to claim 4, wherein the temperature changes at the center and side portions of the turntable are obtained using a vibration width of a sensor output. 10. The flat mirror driving control unit according to claim 4, further comprising a switching unit for turning on / off a solenoid by an output of a microcomputer that outputs a driving signal for driving the flat reflecting mirror. Temperature measuring device using a thermopile sensor. 11. The temperature measuring device using a thermopile sensor according to claim 5, wherein the first solenoid and the second solenoid are designed to face each other with the same polarity. 12. The temperature measuring device using a thermopile sensor according to claim 7, wherein a permanent magnet is used in place of the plate spring integrated with the driving iron piece and the plane reflecting mirror. 13. The temperature measuring device using a thermopile sensor according to claim 7, wherein the polarity of the permanent magnet and the polarity of the solenoid are designed to face each other with the same polarity. 14. The temperature measuring device using a thermopile sensor according to claim 7, wherein the driving iron piece, the leaf spring and the plane reflecting mirror are integrated. 15. The switching unit includes a resistor R1 and a first switch Q1 connected to a microcomputer, a resistor R2 and a resistor R3 connected in parallel to the first switch Q1, and a resistor R2 and a resistor R3 and a solenoid. The temperature measuring apparatus using a thermopile sensor according to claim 10, comprising a second switch (Q2). 16. The transistor according to claim 1, wherein the first switch and the second switch use transistors.
0. A temperature measuring device using the thermopile sensor according to 0. 17. The temperature measuring device using a thermopile sensor according to claim 10, wherein the switching unit includes a resistor and a switch connected between the microcomputer and the plurality of solenoids. 18. A thermopile sensor and an analog / digital converter for initializing a variable for recognizing a position of an object to be cooked at the start of cooking.
A first step of calculating the temperature with respect to the sensor output voltage through the digital change unit; calculating the time after the start of the cooking if the temperature calculation is completed in the first step; and turning off the solenoid if the cooking time is in the first section. And measure the temperature change at the center of the turntable.
And if the cooking time is in the second section in the second step, the solenoid is turned on to measure the temperature change of the side surface of the turntable. If the cooking time is in the third section, the temperature of the object to be cooked is measured. And a third step of comparing the temperature of the turntable with the temperature of the turntable. If the temperature of the turntable is higher than the temperature of the turntable in the third step, the target is located at the center using the temperature change measured, or And a fourth step of determining whether the temperature is present on the side surface. 19. The temperature measurement using a thermopile sensor according to claim 18, wherein the first section of the second step is a time period in which a change in temperature at the center of the turntable can be sufficiently grasped. Method. 20. A second section for measuring a temperature change of a side surface of the turntable in the third step is a first section of the turntable.
The temperature measurement method using a thermopile sensor according to claim 18, wherein the rotation time is a rotation time. 21. reserve the determination of the position of the object to be cooked until the temperature of the object to be cooked becomes higher than the temperature of the turntable if the temperature of the object to be cooked in the fourth step is lower than the temperature of the turntable; 19. The temperature measuring method using a thermopile sensor according to claim 18, further comprising a step of measuring a temperature of a portion determined in the step.