JPH07301427A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To permit the utilization of a pyroelectric infrared ray sensor having no chopper mechanism by setting the boundary surface of an infrared ray detecting area at a place near the central axis of a rotating means, in a high-frequency heating device, controlling a driving means based on the detection result of an infrared ray detecting means, detecting infrared rays emitted from an infrared ray radiating body. CONSTITUTION:When a food 1 is mounted on a turn table 2, turned by a motor 3, and a magnetron 4 is driven, high-frequency wave is projected into a heating chamber 7 through a wave guide 5 whereby the food 1 is heated uniformly. Then, the food 1 projects infrared rays in accordance with the temperature of the food to the circumference of the same while the projected infrared rays in an infrared ray detecting area 11 are detected by a pyroelectric infrared ray sensor 8 through a detecting window 9. The sensor 8 is set at a position so that the boundary surface L of the infrared ray detecting area 11 passes through the central axis 2a of the turn table 2 whereby the area of the food 1 in the detecting area 11 is changed in synchronizm with the period of the rotation to permit the correct catching of the change of surface temperature of the food.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device for heating foods and the like using high frequency waves.

[0002]

2. Description of the Related Art As a conventional device of this type using a pyroelectric infrared sensor, there is a high frequency heating device described in Japanese Patent Laid-Open No. 5-39929. The apparatus described in Japanese Patent Laid-Open No. 5-39929 is shown in FIG. In FIG. 17, 1 is a heating chamber, 2 is food, 3 is a turntable, 6 is a motor,
7 is a high frequency oscillator. 13 is a radiation infrared detector, 1
Reference numeral 4 is a chopper, 15 is a chopper rotation motor, 16 is an opening, and 17 is a shutter, and these constitute a food surface temperature detecting means 18. Reference numeral 19 is a ceiling surface, 20 is a microcomputer, and 21 is a surface temperature detection circuit.

In this structure, the infrared rays emitted from the food 2 are chopped by the chopper 14 from the opening 16 of the ceiling surface 19 of the heating chamber 1 and are input to the emitted infrared ray detector 13. And the radiant infrared detector 1
3 outputs a voltage according to the difference between the temperature of the chopper 14 and the temperature of the food 2. That is, a chopper temperature detecting means (not shown) is provided near the chopper 14, and an analog signal of the differential voltage output from the radiant infrared detector 13 is corrected based on the output of the chopper temperature detecting means. The temperature is sent to the surface temperature detection circuit 21.

[0004]

According to the food surface temperature detecting means 18 of the high frequency heating device having such a structure, there is an advantage that the accurate temperature of the food 2 can be detected. However, since the chopper mechanism 14 and the chopper temperature detecting means are also provided in the vicinity of this chopper, the cost is high and the mechanism is complicated. Further, in order to directly measure the temperature of the food 2 from above, the radiant infrared detector 13 must be installed on the ceiling surface 19 of the heating chamber 1, and the vapor and smoke emitted from the food 2 or the scattered oil and broth can be detected. Radiant infrared detector 13
It easily gets dirty and gets dirty. Further, in the high-frequency heating device combined with the oven function and the grill function, since the heaters are attached to the ceiling surface 19 and the lower wall of the heating chamber 2, it is difficult to install the heat insulating means in the radiant infrared detector 13, and the structure thereof is large. There is a problem that it becomes more complicated and the cost becomes higher.

The present invention has been made in view of the above problems.
The first purpose is to use a pyroelectric infrared sensor without a chopper mechanism, without limiting the installation location to the upper wall of the heating chamber of the high-frequency heating device with a simple structure, and to change the surface temperature of the heated or thawed material. It is to obtain a high-frequency heating device equipped with a surface temperature change detecting means for detecting.

A second object of the present invention is to use a pyroelectric infrared sensor which does not directly contaminate the sensor with steam or smoke emitted from food, or oil or juice splashing from food, so that a heated object or Another object of the present invention is to obtain a high-frequency heating device equipped with a surface temperature change detecting means for detecting the surface temperature change of the thawed material.

A third object of the present invention is to provide a temperature detecting means using a pyroelectric infrared sensor capable of measuring a rough temperature of a food put in a heating chamber of a high frequency heating device with a simple structure. It is to obtain a high frequency heating device.

A fourth object of the present invention is to obtain a high-frequency heating apparatus having a temperature detecting means using a pyroelectric infrared sensor capable of detecting boiling of food with a simple structure.

A fifth object of the present invention is to provide a high-frequency heating apparatus having a temperature detecting means using a pyroelectric infrared sensor capable of detecting the end of thawing of food with a simple structure.

A sixth object of the present invention is to provide a high-frequency heating device equipped with a temperature detecting means using a pyroelectric infrared sensor, which can enhance the accuracy of detection of boiling or thawing of food with a simple structure. Is to get.

[0011]

According to the present invention, there is provided a heating chamber for heating an object to be radiated, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, a driving means for driving the high frequency oscillating means, and a high frequency power. Is provided with a rotating means for rotating the radiated body, an infrared detecting means for detecting infrared rays radiated from the radiated body, and a control means for controlling the driving means based on the detection result of the infrared detecting means, The high frequency heating device is configured such that the boundary surface of the infrared detecting region of the infrared detecting means is set near the central axis of the rotating means.

Further, the high frequency heating device is provided with the infrared detecting means provided on the wall surface of the heating chamber obliquely above the object to be radiated.

Further, according to the present invention, there is provided a heating chamber having an opening / closing door into and from which an object to be radiated is put in and out, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, and a driving means for driving the high frequency oscillating means. A high-frequency heating device is provided, which is provided with an opening / closing door for detecting infrared rays radiated from an object to be radiated, and a control means for controlling the driving means based on the detection result of the infrared detecting means. .

Further, the present invention comprises a heating chamber for heating the body to be radiated, a temperature detecting means for detecting the temperature of the heating chamber, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, and a high frequency oscillating means. The drive means for driving, the rotating means for rotating the object to be heated which is heated by the high frequency power radiated into the heating chamber, and the boundary surface of the infrared detection region near the central axis of the rotating means are set from the object to be irradiated. The high frequency heating device comprises an infrared detecting means for detecting emitted infrared rays and a control means for controlling the driving means based on the detection results of the infrared detecting means and the temperature detecting means.

[0015]

[Function] The food is mounted on the turntable and is rotated integrally with the turntable by the motor. On the other hand, the high frequency emitted from the magnetron is radiated into the heating chamber through the waveguide, and the rotating food is heated uniformly. Infrared rays are projected on the food heated by high frequency, and the projected infrared rays in the infrared ray detection area are detected by the pyroelectric infrared sensor through the detection window. The detection signal of the pyroelectric infrared sensor is input to the control device via the amplifier, and the magnetron 4 is controlled based on the time-series detection signal.

The pyroelectric infrared sensor outputs a differential signal when the amount of received infrared light in the detection area changes. A positive signal is output when the amount of infrared rays to the pyroelectric infrared sensor increases, and a negative signal is output when the amount of infrared rays decreases.
When one side of the infrared detection area is set on the center axis of the turntable, by rotating the turntable,
The area of the food in the detection area when viewed from the pyroelectric infrared sensor changes in synchronization with the rotation cycle. Therefore, the incident infrared ray amount of the pyroelectric infrared sensor also changes periodically.

[0017]

Preferred embodiments of the present invention will be described below with reference to the drawings. Example 1. FIG. 1 is a structural explanatory diagram of Embodiment 1 of the present invention, and FIG.
2 is a plan view of FIG. 1. FIG. 1 and 2, 1 is food, 2 is a turntable, and 3 is a motor. When the motor 3 is driven, the turntable 2 on which the food 1 is placed rotates about the central axis 2a. Reference numeral 4 is a magnetron, 5 is a waveguide, 6 is a control device composed of an electronic circuit including a microcomputer, and 7 is a heating chamber. Reference numeral 8 is an infrared sensor, 9 is a detection window provided on the side wall surface 7a of the heating chamber 7, and 10 is an amplifier. The infrared sensor 8 includes a heat sensor and a quantum sensor, but a pyroelectric infrared sensor is used here.

Reference numeral 11 is an infrared detection area, and L is a boundary surface for partitioning the inside and outside of the infrared detection area 11. The infrared detection area 11 has a solid angle α surrounded by a boundary line L with a focus on the pyroelectric infrared sensor 8 as shown by a broken line.
It is composed of. The position of the boundary line L is set so as to substantially coincide with the center axis 2a of the turntable 2. As a result, the pyroelectric infrared sensor 8 passes through the detection window 9 and the infrared detection area 1 represented by the solid angle α.
Infrared rays in 1 are received. Reference numeral 12 is a high-frequency heating device.

The operation of the embodiment of the present invention having such a configuration will be described below.
It will be described next. The food 1 is mounted on the turntable 2, and the motor 3 rotates integrally with the turntable 2. On the other hand, the high frequency wave emitted from the magnetron 4 is radiated into the heating chamber 7 through the waveguide 5, and the rotating food 1 is heated uniformly. The food 1 heated by high frequency projects infrared rays according to the temperature of the food, and the projected infrared rays in the infrared detection area 11 are detected by the pyroelectric infrared sensor 8 through the detection window 9. The detection signal of the pyroelectric infrared sensor 8 is input to the control device 6 via the amplifier 10, and the magnetron 4 is controlled based on the time-series detection signal.

Generally, the pyroelectric infrared sensor outputs a differential type signal when the amount of received infrared light in the detection area 11 changes. A positive signal is output when the amount of infrared rays to the pyroelectric infrared sensor 8 increases, and a negative signal is output when the amount of infrared rays decreases. As shown in FIG. 2, the infrared detection area 1
Since the boundary surface L of 1 is set on the central axis 2a of the turntable 2, by rotating the turntable 2, the detection area 11 that forms the solid angle α when viewed from the pyroelectric infrared sensor 8 is detected. The area of the food 1 inside changes in synchronization with the rotation cycle. Therefore, the incident infrared ray amount of the pyroelectric infrared sensor 8 also changes periodically.

When the food 1 is heated and its temperature rises, the incident infrared ray amount of the pyroelectric infrared sensor 8 also increases in response to the temperature rise. Therefore, the detection signal of the pyroelectric infrared sensor 8 actually increases while periodically changing. The signal waveform obtained at this time is shown in FIG. Figure 3
The horizontal axis represents the time t, and the vertical axis represents the output of the pyroelectric infrared sensor 8.

When the food 1 having a circular cross section such as a conical shape, a cylindrical shape, or a spherical shape is arranged concentrically with the central axis 2a of the turntable 2, the detection area of the pyroelectric infrared sensor 8 changes. There is no. Therefore, the incident infrared ray amount of the pyroelectric infrared sensor 8 does not change. However, it is virtually impossible to arrange the above horizontal cross section on the central axis 2a to be a perfect circle and to be accurately coaxially arranged on the turntable 2. Even if it is possible, there is certainly no signal change in the early stage of heating, but in the case of high frequency heating, it is difficult to distribute the high frequency in the heating chamber 7 completely, so the emitted high frequency The distribution of electric power in the heating chamber 7 becomes non-uniform, causing uneven heating of the food 1. Therefore, the incident infrared ray amount of the pyroelectric infrared sensor 8 changes.

According to the first embodiment, the pyroelectric infrared sensor 8
Since it has no chopper mechanism and is of an independent type and has no temperature detecting means, the structure is extremely simple as compared with the conventional device. In addition, since the pyroelectric infrared sensor 8 is attached to the lateral wall surface of the heating chamber 7, the steam and dripping from the food 1 are less likely to be directly attached to the pyroelectric infrared sensor 8, and are used for ovens and grills. Since it is also separated from the heater of (3), it is easy to insulate it, malfunctions are reduced and the service life is extended.

Embodiment 2 FIG. 4 is a structural explanatory view of Embodiment 2 of the present invention, and FIG. 5 is a plan explanatory view of FIG. In Example 2 of FIGS. 4 and 5, the pyroelectric infrared sensor 8 is provided on the ceiling surface of the heating chamber 7. Further, the pyroelectric infrared sensor 8 is arranged at an oblique position in the turntable 2 near the side wall from the axis 2b of the central axis 2a. Also in the second embodiment, the boundary surface L of the detection area 11 is set substantially on the central axis 2a. According to the configuration of the second embodiment, since the pyroelectric infrared sensor 8 is removed from directly above the turntable 2, it is possible to reduce the influence of adhesion of splashed juice or the like that comes out of the food 1.

Embodiment 3 FIGS. 6 and 7 are a structural explanatory view and a plan explanatory view of a third embodiment of the present invention. 6 and 7 also show a case where the position of the boundary surface L of the detection area 11 is made to coincide with the center axis 2a of the turntable 2. However, in FIGS. 6 and 7, the pyroelectric infrared sensor 8 is arranged at the corner of the side wall of the heating chamber 7 near the ceiling surface. Therefore, also in the cases of Embodiments 2 and 3, the pyroelectric infrared sensor 8 detects the signal waveform which increases while periodically changing as shown in FIG.

Example 4. FIG. 8 is a structural explanatory view of the fourth embodiment of the present invention. In FIG. 8, 20 is a door of the high frequency heating device 12, 21 is an inner glass, 22 is a punching metal for preventing microwave leakage, 23 is an infrared transparent glass, 2
4 is an outer glass. The central axis 2a of the boundary surface L when the other members such as the pyroelectric infrared sensor 8 and the door 20 are closed
The above setting has the same configuration as that of the first embodiment. In particular,
In the second embodiment, the pyroelectric infrared sensor 8 is provided inside the door 20. The door 20 is arranged from the inner side to the glass 21, the punching metal 22, and the outer glass 24 in this order, and a part of the inner glass 21 is hollowed out so that the infrared transparent glass 2
3 is fitted. Then, the cut-out portion is used as the detection window 9
The pyroelectric infrared sensor 8 is attached to the outside of the punching metal 22.

As described above, in the fourth embodiment, the pyroelectric infrared sensor 8 is mounted inside the door 20 through the infrared transparent glass 23. For this reason, the vapor and the juice from the food 1 are hardly scattered directly to the pyroelectric infrared sensor 8 and are also separated from the heater (not shown) attached to the upper wall used in oven cooking or grill cooking. In addition, the heat insulating structure can be easily configured, and malfunctions are eliminated as compared with the above-described embodiments, and the life is further extended.

Example 5. FIG. 9 is a perspective explanatory view showing the configuration of Embodiment 5 of the present invention, and FIG. 9 shows a state where the door 20 of the high frequency heating device 12 is opened. In FIG.
30 is a styrene tray. Pyroelectric infrared sensor 8
Is attached to the door 20 with the same configuration as that of the fourth embodiment, and receives infrared rays in the infrared detection area 11 surrounded by the boundary surface L shown by the broken line. Then, as shown in the drawing, the door 20 is opened and the food 1 is placed on the styrene tray 30.
And is placed on the turntable 2 in the heating chamber 7. At this time, the pyroelectric infrared sensor 8 detects the food 1 passing in front of the door 20 to detect the ambient temperature (room temperature) and the food 1.
A signal is generated according to the temperature difference between and, and is input to the control device 6 via the amplifier 10 shown in FIG. 1, and the magnetron 4 is controlled based on this signal in time series.

FIG. 10 (A) shows the output waveform of the pyroelectric infrared sensor 8 when the food 1 at -18 ° C. is put into the heating chamber 7 immediately after being taken out from the freezer of the refrigerator. Also,
(B) is an output waveform when the food 1 at -5 ° C is put, and (C) is an output waveform when the food 1 at 40 ° C is put. (A) Foods that are considerably colder than room temperature 1
It is the case that is input, and there is a feature that a large negative signal appears first. Although (B) is lower than room temperature, a relatively small negative signal is first output when the food 1 is taken out of the freezer room for a while and when the food 1 is improperly frozen. Since the food 1 having a temperature higher than room temperature is put in (C) of the figure, there is a feature that a positive signal appears first.

For example, in the case of defrosting with the high-frequency heating device 12, in the case of (A), the defrosting is carried out under the usual control.
In the case of (B), for example, by correcting the thawing time shorter, changing the output of the high frequency to a weaker control, and the like, it is possible to prevent overthawing and improve the thawing finish. it can. Further, for example, in the case of warm cooking with the high-frequency heating device 12, in the case of (C), the heating is performed under the usual control, but in the case of (A), the program is first used for the defrosting control, and then the warming control is performed. You can switch to a special program to improve the finish. This is because if the frozen food 1 is heated at a stretch, uneven heating easily occurs.

Example 6. FIG. 11 is a configuration explanatory view of the sixth embodiment of the present invention, and illustrates a case where the food 1 is put in a container and cooked by heating. FIG. 12 is a graph showing changes in the output waveform from the pyroelectric infrared sensor 8 when heating is actually performed. The horizontal axis represents time and the vertical axis represents sensor output. It can be clearly seen that the signal changes in synchronization with the rotation of the turntable 2 and the signal increases as the heating progresses. It can be seen that the signal from the pyroelectric infrared sensor 8 is severely disturbed when the food 1 is sufficiently warmed to start boiling. This is due to the steam blown from the food 1.
Since this is a characteristic signal change, this detection is simple, and it is possible to finish the heating by heating when the signal disturbance is detected.

As a concrete detection method, the number of peak values or the number of signal changes from positive to negative or from negative to positive is counted for each rotation cycle of the turntable 1, and when the number greatly increases. There is a method to finish warming with.

Example 7. FIG. 13 is a structural explanatory view of the seventh embodiment of the present invention. Generally, when the food 1 is heated by thawing, its temperature approaches the temperature in the heating chamber 7 in a steady state, so the temperature difference between the food 1 and the heating chamber 7 becomes smaller, and the pyroelectric infrared rays are actually used. The signal obtained from the sensor 8 decreases while making periodic changes.

FIG. 14 is a graph showing changes in the output waveform from the pyroelectric infrared sensor 8 when thawing and heating are actually performed. The horizontal axis represents time and the vertical axis represents sensor output. It can be clearly seen that the signal changes in synchronization with the rotation of the turntable 2 and the signal becomes smaller as the heating progresses. When the food 1 reaches about −3 ° C. near the end of thawing, most of the frozen portion in the cells of the food 1 begins to melt,
The proportion of the heat supplied by the high-frequency heating consumed as latent heat increases, so that the temperature rise of the food 1 temporarily slows down. As a result, there is almost no change in time series near -3 ° C near the end of the thawing, and the thawing end point can be detected by detecting this point.

As a concrete detection method, the maximum peak value is detected for each rotation cycle of the turntable 2 and the rate of change is observed, and the maximum peak value in the first round is detected and thereafter. There are a method of following a synchronized signal, a method of integrating all or a part of each cycle, and a method of following a change in the integrated value.

Example 8. FIG. 15 is a structural explanatory view of the eighth embodiment of the present invention. In FIG. 15, reference numeral 60 is a thermistor. The thermistor 60 is provided on the side wall of the heating chamber 7
Measure the temperature. Also in the eighth embodiment, the boundary surface L of the detection area 11 of the pyroelectric infrared sensor 8 is arranged on the central axis 2a of the turntable 2 as in the above-described respective embodiments. As described in Example 7 above, when the food 1 is heated by thawing, its temperature approaches the temperature in the heating chamber 7 in a steady state, so the food 1 and the heating chamber 7
The temperature difference between and becomes smaller, and the signal actually obtained from the pyroelectric infrared sensor 8 decreases while making periodic changes.

However, the temperature in the heating chamber 7 is considerably higher than room temperature after, for example, oven cooking using a heater, grill cooking, and warm cooking, and 3 after grill cooking.
It may have risen to around 00 ° C. Since the temperature change in the heating chamber 7 is smaller than the temperature change of the food 1 in the normal thawing, there is a phenomenon that the output of the pyroelectric infrared sensor 8 disappears near the thawing end point near -3 ° C. ,
This phenomenon becomes weak when the temperature change in the heating chamber 7 is large.

FIG. 16 is a graph showing changes in the output waveform from the pyroelectric infrared sensor 8 when thawing and heating are actually performed after cooking in the oven. The horizontal axis represents time and the vertical axis represents sensor output. It can be clearly seen that the signal changes in synchronization with the rotation of the turntable 2 and the signal becomes smaller as the heating progresses. When the food 1 reaches about -3 ° C near the end of thawing, most of the frozen portion in the cells of the food 1 starts to melt, so the heat supplied by the high frequency heating is largely consumed as latent heat. Therefore, the temperature rise of the food 1 is temporarily slowed down.

However, since the temperature of the heating chamber 7 is still decreasing because it is just after using the oven, the temperature change is not slowed down as a result, and the temperature change hardly disappears. It exceeds the end point and fails. Therefore, the temperature of the heating chamber 7 is detected as a correction means, and when the heating chamber 7 is at a high temperature, it is safe,
The thawing is completed when the temperature changes slowly. As a result, even after the oven cooking, the grill cooking, and the warm cooking, the thaw cooking can be performed without causing the user to wait until the heating chamber 7 cools down.

Further, during normal boiling detection, the temperature of the food 1 rises earlier than the temperature in the heating chamber 7 to generate steam, and the temperature difference and the aperiodicity of steam are used for boiling. It is detecting. However, if the temperature of the heating chamber 7 is initially high and gradually becomes high during high frequency cooking, and if the temperature of the steam and the temperature of the heating chamber 7 are almost the same at around 100 ° C, there is no temperature difference. Therefore, the signal may not be detected in some cases. In order to prevent such a situation, when the temperature in the heating chamber 7 becomes around 100 ° C., the sensitivity of the pyroelectric infrared sensor 8 is increased to deal with it.

On the contrary, if the temperature of the heating chamber 7 becomes 100 ° C. and the signal that has been output so far cannot be detected, it is considered that the temperature difference between the food 1 and the heating chamber 7 has disappeared, and therefore the food It is also effective to judge that the temperature of the steam from No. 1 or from the food 1 has risen to near 100 ° C. and end the heating.

[0042]

According to the present invention, a heating chamber for heating an object to be radiated, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, a driving means for driving the high frequency oscillating means, and a high frequency power is applied. Rotating means for rotating the radiated body,
Infrared detecting means for detecting infrared rays emitted from the object to be radiated, and control means for controlling the driving means based on the detection result of the infrared detecting means, the boundary surface of the infrared detecting area of the infrared detecting means of the rotating means. A high-frequency heating device set near the central axis was constructed. As a result, since the pyroelectric infrared sensor without the chopper mechanism is used, the mechanism is extremely simple and the cost can be reduced.

Further, the high-frequency heating device is constructed in which the infrared detecting means is provided on the wall surface of the heating chamber obliquely above the object to be radiated. As a result, the installation location of the infrared detecting means can be selected in a place other than directly above the side wall of the heating chamber, etc., and splashes from the radiated object to be heated and contamination by steam etc. are eliminated. Also,
The detection accuracy of the infrared detecting means is not lowered, and the maintenance work is easy and the handling is easy.

According to the present invention, there is provided a heating chamber having an opening / closing door into and from which an object to be radiated is put in / out, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, a driving means for driving the high frequency oscillating means, and an opening / closing door. A high-frequency heating device is provided, which is provided with an infrared detecting means for detecting infrared rays emitted from the object to be radiated and a control means for controlling the driving means based on the detection result of the infrared detecting means. As a result, a pyroelectric infrared sensor without a chopper mechanism is provided on the outside of the door of the high-frequency heating device, and when the door is opened and food is inserted, it passes through the detection area of the sensor. You can tell whether food is cold or not, or hot or not. Further, it is possible to detect the boiling or thawing of food by a simple mechanism. Further, the arrangement of the heater heating source for the oven or the grill cooking can be configured almost independently of the arrangement.

According to the present invention, a heating chamber for heating an object to be radiated, a temperature detecting means for detecting the temperature of the heating chamber, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber,
The driving means for driving the high frequency oscillating means, the rotating means for rotating the radiated body heated by the high frequency power radiated in the heating chamber, and the boundary surface of the infrared detection region are set near the central axis of the rotating means. A high-frequency heating device is provided, which includes infrared detection means for detecting infrared rays emitted from the object to be radiated, and control means for controlling the driving means based on the detection results of the infrared detection means and the temperature detection means. As a result, the temperature detecting means measures the temperature inside the heating chamber and uses it as a correction signal, so that it is possible to accurately improve the accuracy of boiling detection and thaw end detection even after oven cooking, grill cooking and warm cooking.

Therefore, according to the present invention, the structure is simple without using the chopper mechanism, the installation location does not need to be attached to the upper wall of the heating chamber, it is resistant to dirt, and it is easy to insulate because it is separated from the heater, and the cost is low. It is possible to provide a high-frequency heating device equipped with a temperature sensor capable of reducing the temperature and detecting a surface temperature change having a long life.

[Brief description of drawings]

FIG. 1 is a configuration explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory plan view of FIG.

FIG. 3 is an output waveform diagram of the pyroelectric infrared sensor of FIG.

FIG. 4 is a configuration explanatory diagram of a second embodiment of the present invention.

5 is an explanatory plan view of FIG. 4. FIG.

FIG. 6 is a structural explanatory view of a third embodiment of the present invention.

7 is an explanatory plan view of FIG.

FIG. 8 is a structural explanatory view of a fourth embodiment of the present invention.

FIG. 9 is a structural explanatory view of a fifth embodiment of the present invention.

10 is an output waveform diagram of the pyroelectric infrared sensor of FIG.

FIG. 11 is a structural explanatory view of a sixth embodiment of the present invention.

12 is an output waveform diagram of the pyroelectric infrared sensor of FIG.

FIG. 13 is a structural explanatory view of a seventh embodiment of the present invention.

14 is an output waveform diagram of the pyroelectric infrared sensor of FIG.

FIG. 15 is a structural explanatory view of an eighth embodiment of the present invention.

16 is an output waveform diagram of the pyroelectric infrared sensor of FIG.

FIG. 17 is a structural explanatory view of a conventional high-frequency heating device.

[Explanation of symbols]

1 food, 2 turntable, 3 motor, 4 magnetron, 7 heating chamber, 8 pyroelectric infrared sensor, 11
Detection area, 23 infrared transparent glass, 60 thermistor, α solid angle, L boundary line.

Claims (4)

[Claims] 1. A heating chamber for heating an object to be radiated, a high-frequency oscillating means for oscillating high-frequency power radiated into the heating chamber, a driving means for driving the high-frequency oscillating means, and an object to be irradiated with the high-frequency power. The infrared radiation detecting means for detecting the infrared radiation emitted from the radiation target body; and the control means for controlling the driving means based on the detection result of the infrared radiation detection means. A high-frequency heating device, characterized in that the boundary surface of the infrared detection region of the detection means is set near the central axis of the rotating means. 2. The infrared detecting means is provided on the wall surface of the heating chamber obliquely above the radiated body.
The high-frequency heating device described. 3. A heating chamber having an opening / closing door into and from which an object to be radiated is put in and out, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, a driving means for driving the high frequency oscillating means, and the opening / closing. A high-frequency heating apparatus comprising: an infrared detecting means provided on a door for detecting infrared rays emitted from an object to be radiated; and a control means for controlling the driving means based on a detection result of the infrared detecting means. . 4. A heating chamber for heating an object to be radiated, a temperature detecting means for detecting the temperature of the heating chamber, a high frequency oscillating means for oscillating high frequency power radiated into the heating chamber, and a driving means for the high frequency oscillating means. Driving means, rotating means for rotating an object to be heated which is heated by high-frequency power radiated in the heating chamber, and a radiation surface by setting a boundary surface of an infrared detection region near a central axis of the rotating means. A high-frequency heating device comprising: an infrared detecting means for detecting infrared rays emitted from the body; and a controlling means for controlling the driving means based on the detection results of the infrared detecting means and the temperature detecting means.