JP2011158213A - High frequency heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency heating device with an infrared ray sensor of low cost without sacrificing a view angle and the noise-proof performance of the infrared ray sensor. <P>SOLUTION: An optical lens, a reflection mirror and a reflector are not used in the infrared ray sensor 4 in order to reduce the cost of the infrared ray sensor 4, a sensor opening 8 of the infrared ray sensor 4 is increased in size to lower a gain of an amplifier of the infrared ray sensor 4 to the noise-proof performance allowable in the accuracy of a detection temperature of the infrared ray sensor 4, and an opening 6 formed at a wall surface of a heating chamber 2 of the high frequency heating device is determined to have an opening size to block the view angle of the infrared ray sensor 4 to prevent an adverse effect of the widening of the view angle of the infrared ray sensor 4 caused by the increase of the sensor opening 8 of the infrared ray sensor 4 in size, and thus the view angle of the infrared ray sensor 4 can be reduced as the total result of the infrared ray sensor 4 and the opening 6 formed on the wall surface of the heating chamber 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-frequency heating device that detects a surface temperature of an object to be heated in a non-contact manner using an infrared sensor and controls a high-frequency generator.

  Conventionally, this type of high-frequency heating device has an infrared sensor installed outside the heating chamber, detects the temperature of the object to be heated placed in the heating chamber through an opening provided on the wall surface of the heating chamber, and based on the temperature information Control the high frequency generator. And the magnitude | size of the opening provided in the wall surface of a heating chamber is set to the magnitude | size which does not block the viewing angle of an infrared sensor so that the detection temperature of an infrared sensor may not be affected (for example, refer patent document 1). Although this patent document does not clearly describe the size of the opening provided in the heating chamber, it is apparent that the size is set so as not to obstruct the viewing angle of the infrared sensor.

  FIG. 3 shows a conventional high-frequency heating device described in Patent Document 1. As shown in FIG. 3, the infrared sensor 4 installed outside the heating chamber 2, the opening 6 provided in the wall surface of the heating chamber 2, and the surface temperature of the article 1 to be heated placed in the heating chamber 2 It is comprised from the control apparatus 5 which controls the high frequency generator 3 based on the detected temperature of the infrared sensor 4. FIG.

JP 2001-173960 A

  The size of the object to be heated cooked by the high-frequency heating device varies, and a small one may be used for cooking one Shumai. Therefore, the viewing angle of the infrared sensor for detecting the temperature of the object to be heated is generally set to about 7 ° or less so that the temperature of the small object to be heated can be detected.

  However, in the conventional configuration, in order to reduce the viewing angle of the infrared sensor to about 7 ° or less, it is necessary to install an optical lens or a reflecting mirror at the tip of the infrared sensor, or to install a reflector in the infrared sensor. , Has the problem of high costs. To reduce the viewing angle to about 7 ° or less without using an optical lens, reflector, or reflector, the aperture at the tip of the infrared sensor can be reduced, but the amount of infrared rays that enter the infrared sensor is small because the aperture is small. Therefore, it is necessary to increase the gain of the amplifier of the infrared sensor. When the gain of the amplifier is increased, the amount of noise amplification increases and the noise resistance performance deteriorates. Since the high-frequency heater generates high-frequency radio waves, the amount of noise generated is large, and if the noise resistance of the infrared sensor deteriorates, there is a problem that the detection temperature of the infrared sensor is affected.

  An object of the present invention is to solve the above-described conventional problems, and to provide a high-frequency heating device that simplifies the configuration of the infrared sensor and is inexpensive without sacrificing the viewing angle and noise resistance performance of the infrared sensor. And

In order to solve the above-mentioned conventional problems, the high-frequency heating device of the present invention increases the aperture of the infrared sensor without using an optical lens, a reflecting mirror, or a reflector in order to reduce the cost of the infrared sensor. In order to prevent the harmful effects of the infrared sensor's viewing angle from being widened by reducing the gain of the infrared sensor's amplifier to a noise-resistant performance that allows the detection accuracy of the infrared sensor's temperature to be acceptable. By making the opening provided on the wall of the heating chamber of the high-frequency heating device an opening size that blocks the viewing angle of the infrared sensor, the infrared sensor and the opening provided on the wall of the heating chamber can be combined to increase the viewing angle of the infrared sensor. It can be made smaller.

  In order to simplify the configuration of the infrared sensor and reduce the cost, the high-frequency heating device of the present invention increases the aperture of the infrared sensor without using an optical lens, a reflecting mirror, or a reflector, thereby reducing the cost of the infrared sensor. In order to prevent the harmful effect of widening the viewing angle of the infrared sensor by reducing the gain of the amplifier to the noise-resistant performance that allows the detection temperature accuracy of the infrared sensor to be acceptable, and increasing the aperture of the infrared sensor, By making the opening provided on the wall of the heating chamber into an opening size that blocks the viewing angle of the infrared sensor, the viewing angle of the infrared sensor can be reduced in total with the opening provided on the wall of the heating chamber. It is.

Main part block diagram of high frequency heating apparatus in Embodiment 1 of this invention Configuration diagram of a high-frequency heating device in Embodiment 1 of the present invention Configuration diagram of a conventional high-frequency heating device

  According to a first aspect of the present invention, there is provided a heating chamber that accommodates an object to be heated, a high-frequency generator that radiates high-frequency radio waves to the heating chamber, an infrared sensor that detects a surface temperature of the object to be heated in a non-contact manner, and an infrared sensor An opening provided on the wall surface of the heating chamber, and an opening provided on the wall surface of the heating chamber. In order to reduce the cost of the infrared sensor by setting the aperture size to block the viewing angle of the infrared sensor in the previous term, the infrared sensor has a larger aperture without using an optical lens, reflector or reflector. In addition, the gain of the infrared sensor amplifier is reduced to noise-resistant performance that allows the detection temperature accuracy of the infrared sensor to be acceptable, and the opening of the infrared sensor is increased. In order to prevent the adverse effect of widening the viewing angle of the infrared sensor, the opening provided on the wall of the heating chamber of the high-frequency heating device is made to be an opening size that blocks the viewing angle of the infrared sensor, thereby providing the infrared sensor and the heating chamber on the wall. The viewing angle of the infrared sensor can be reduced in total with the open aperture.

  According to the second aspect of the present invention, when the accuracy of the detection temperature of the infrared sensor deteriorates only by the configuration of the first aspect of the invention by providing a heat insulating material around the opening provided on the wall surface of the heating chamber, The accuracy can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a main part configuration diagram of the high-frequency heating device according to the first embodiment of the present invention, and FIG. 2 is a configuration diagram of the high-frequency heating device according to the first embodiment of the present invention.

1 and 2, a heating chamber 2 that houses an object 1 to be heated, a high-frequency generator 3 that radiates high-frequency radio waves to the heating chamber 2, and an infrared sensor 4 that detects the surface temperature of the object 1 to be heated in a non-contact manner. And a control device 5 for controlling the high-frequency generator 3 based on the surface temperature of the object 1 to be heated, and an infrared sensor 4 provided on the wall surface of the heating chamber 2 for detecting the surface temperature of the object 1 to be heated in a non-contact manner. An opening 6, a case 7 for housing the infrared sensor 4, a sensor opening 8 provided at the tip of the infrared sensor 4, and a heat insulating material 9 provided around the opening 6 provided on the wall surface of the heating chamber 2. ing.

  About the high frequency heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the basic operation will be described. When the high frequency heating device starts cooking, the control device 5 starts driving the high frequency generator 3, and high frequency radio waves are radiated into the heating chamber 2. At the same time, the infrared sensor 4 starts to detect the surface temperature of the heated object 1 through the opening 6 provided on the wall surface of the heating chamber 2 in a non-contact manner. And the control apparatus 5 stops the high frequency generator 3 by the information of the detected surface temperature of the to-be-heated object 1, and complete | finishes cooking.

  Next, details will be described. The sensor opening 8 at the tip of the infrared sensor 4 is set to have a large opening size (dimension) so that the gain of the amplifier (not shown) of the infrared sensor 4 can be lowered to a noise-resistant performance that allows the accuracy of the detection temperature of the infrared sensor 4. It is. When no optical lens, reflector, or reflector is used for the infrared sensor 4, the size of the sensor element (not shown) of the infrared sensor 4, the distance between the sensor element (not shown) and the sensor opening 8, and the opening of the sensor opening 8. The viewing angle A of the infrared sensor 4 is naturally determined depending on the size.

  Therefore, if the opening size of the sensor opening 8 is increased, the viewing angle A of the infrared sensor 4 becomes wider. The viewing angle A of the sensor opening 8 that can ensure the noise-resistant performance that can be detected by the detection temperature of the infrared sensor 4 varies depending on various conditions such as the noise-resistant performance of the infrared sensor 4 and the position of the infrared sensor 4 in the high-frequency heating device. Generally, it is about 15 ° or more.

  The size of the object to be heated 1 cooked by the high-frequency heating device varies, and a small one may be used for cooking one Shumai. Therefore, the viewing angle of the infrared sensor 4 that detects the temperature of the heated object 1 is generally set to about 7 ° or less so that the temperature of the small heated object 1 can also be detected. Therefore, it is too wide when the viewing angle A is about 15 ° or more.

  Therefore, the viewing angle A of the infrared sensor 4 can be apparently made the viewing angle B by blocking the viewing angle A of the infrared sensor 4 by the opening 6 provided in the wall surface of the heating chamber 2. Since the viewing angle B of the infrared sensor 4 can be determined by the opening size of the opening 6 provided in the wall surface of the heating chamber 2, the viewing angle B can be set to about 7 ° or less.

  In this case, the viewing angle of the infrared sensor 4 is only the viewing angle A and apparently the viewing angle B. Therefore, the infrared sensor 4 detects the temperature of the heated object 1 in the heating chamber 2 at the viewing angle B through the opening 6 provided on the wall surface of the heating chamber 2. Since the temperature around the opening 6 provided on the wall surface is also detected, the detection temperature of the infrared sensor 4 is the temperature of the heated object 1 in the heating chamber 2 and the ambient temperature of the opening 6 provided on the wall surface of the heating chamber 2. The average value of is detected.

However, it is not a simple average value, but is determined by the aperture area ratio between the viewing angle A and the viewing angle B and the viewing angle characteristics of the infrared sensor 4. And since the heating temperature rise by the high frequency radio wave radiated | emitted from the high frequency generator 3 is little around the opening 6 provided in the wall surface of the heating chamber 2, it becomes a temperature substantially equal to the ambient temperature of the infrared sensor 4, but the heating chamber 2 Depending on the position of the opening 6 provided on the wall surface and the method of stirring the high-frequency radio wave radiated from the high-frequency generator 3, the temperature around the opening 6 provided on the wall surface of the heating chamber 2 may rise slightly. In such a case, by providing the heat insulating material 9 around the opening 6 provided on the wall surface of the heating chamber 2, the heat insulating material 9 blocks the temperature rise around the opening 6 provided on the wall surface of the heating chamber 2. Can be improved.

  Since a temperature detecting element (not shown) such as a thermistor is built in the infrared sensor 4, the ambient temperature of the opening 6 provided on the wall surface of the heating chamber 2 can be detected. Accordingly, since the temperature in the range of the viewing angle A excluding the viewing angle B of the infrared sensor 4 can be detected, the detection temperature of only the viewing angle B of the infrared sensor 4 can be calculated.

  For reference, the case where the viewing angle A of the infrared sensor 4 is not blocked by the opening 6 provided in the heating chamber 2 will be described. Since the viewing angle A is about 15 ° or more, if the heated object 1 in the heating chamber 2 is small, the temperature around the heated object 1 is also detected, and the average value of the temperature of the heated object 1 and the ambient temperature is calculated. To detect.

  The object to be heated 1 is placed directly on the bottom surface of the heating chamber 2 or placed on a dish (not shown), but the bottom surface and the dish of the heating chamber 2 are made of glass or porcelain. The temperature rises due to heating by the high-frequency radio wave radiated from the generator 3. Since the degree of temperature change varies depending on the size of the object to be heated 1 and the heating time, it is impossible to calculate the temperature of only the object to be heated 1 from the temperature detected by the infrared sensor 4. 1 cannot be stopped at an appropriate temperature.

  As described above, in the present embodiment, in order to reduce the cost of the infrared sensor 4, the sensor opening 8 of the infrared sensor 4 is enlarged without using an optical lens, a reflecting mirror, or a reflector for the infrared sensor. In addition, the gain of the amplifier of the infrared sensor 4 is reduced to a noise resistance performance that allows the accuracy of the detection temperature of the infrared sensor 4 and the opening of the infrared sensor 4 is enlarged, thereby preventing the adverse effect of widening the viewing angle of the infrared sensor 4. Therefore, by making the opening 6 provided on the wall surface of the heating chamber 2 of the high-frequency heating device into an opening size that blocks the viewing angle of the infrared sensor 4, the total of the infrared sensor 4 and the opening 6 provided on the wall surface of the heating chamber 2. Thus, the viewing angle of the infrared sensor 4 can be reduced.

  As described above, the high-frequency heating device according to the present invention is not limited to the high-frequency heating device and can be used for other devices using an infrared sensor, and can be widely applied.

2 Heating chamber 4 Infrared sensor 6 Opening

Claims (2)

A heating chamber that houses an object to be heated, a high-frequency generator that radiates high-frequency radio waves to the heating chamber, an infrared sensor that detects a surface temperature of the object to be heated in a non-contact manner, and the infrared sensor that is in the heating chamber An opening provided on the wall surface of the heating chamber for detecting the temperature of the object to be heated and a control device for controlling the high-frequency generator based on the surface temperature of the object to be heated are provided on the wall surface of the heating chamber. The high-frequency heating apparatus is characterized in that the opening has an opening size that blocks a viewing angle of the infrared sensor. The high-frequency heating device according to claim 1, wherein an opening provided on a wall surface of the heating chamber and a heat insulating material are provided around the opening.

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