JP2003158394A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable high frequency heating device capable of surely transferring a signal through a lead wire connecting a device, for detecting the temperature of a high frequency heating device overheating chamber and a controller by preventing the lead wire from being affected by any high frequency noise. SOLUTION: A lead wire 9 connecting a detecting device 22 and a controller 21 is constituted by coating a core wire constituted by coating a conductor with an insulator with an insulator 20 containing a radio absorber. A temperature detecting device 22 is constituted of an infrared detecting element 10 for detecting an infrared ray to be radiated from food, a lens 22 for converging the infrared ray to be radiated from food on the infrared detecting element 10, a chopper 12 for periodically intermitting the infrared ray, a motor 13 for driving the rotation of the chopper 12, an amplifier circuit 14 for amplifying the signal of the infrared detecting element 10, and a board 15 on which the infrared detecting element 10 and the amplifier circuit 14 and the motor are mounted.

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 having a lead wire for connecting a detection device for detecting temperature, humidity, gas, etc. and a control device.

[0002]

2. Description of the Related Art Heretofore, as a high-frequency heating apparatus of this kind, there has been one described in, for example, Japanese Utility Model Publication No. 55-149107. FIG. 4 is an electric circuit diagram of a main part of the conventional high-frequency heating device described in the above publication.

In FIG. 4, an infrared detecting element 1 for receiving infrared rays emitted from an object to be heated and outputting a signal corresponding to the temperature of the object to be heated, an amplifier circuit 2 for amplifying the signal and an infrared ray. The shield case 3 enclosing the detection element 1 and the amplifier circuit 2 and the feedthrough capacitor 4 attached to the shield case 3 are provided, and the internal signal line 5 in the shield case 3 is connected to the external signal line 6 through the feedthrough capacitor 4. is there. Although there is always a weak high frequency leaked from the heating chamber inside the high frequency heating device, the feedthrough capacitor 4 acts to prevent the high frequency propagating from the external signal line 6 from propagating to the internal signal line 5, and the shield case 3 prevents Since high frequencies propagating in the air are shielded, the intrusion of high frequency noise into the shield case 3 can be completely blocked.

[0004]

However, in the above-mentioned conventional structure, the structure of the shield case becomes complicated because a capacitor must be formed integrally with the internal signal line 5 in the through hole of the shield case 3. Had. Further, as an application of the temperature detector using the infrared detecting element as in the conventional example, the entire shield case 3 may be driven between predetermined positions to detect temperatures at a plurality of positions. At this time, since the shield case 3 is driven while the external signal line 6 is connected, the external signal line is required to have flexibility. The present invention is to solve the above-mentioned conventional problems, and has a simple structure in which a signal can be exchanged between a detection element such as temperature, humidity and gas and a control device without being affected by high frequency noise. It is an object of the present invention to provide a high-frequency heating device having high efficiency.

[0005]

In order to solve the above-mentioned conventional problems, the lead wire connecting the detection device and the control device has a conductor coated with an insulator and a core wire covered with an insulator including a radio wave absorber. It is configured.

As a result, since the coating of the lead wire including the electromagnetic wave absorbing member completely absorbs the high frequency noise, it is possible to prevent the high frequency noise from entering the inside of the shield case.

Further, since it is not necessary to use a metal mesh or the like for the external signal line, the external signal line is flexible.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1
A high-frequency noise that attempts to enter through the through hole of the shield case by providing a lead wire for connecting a detection device that detects humidity, gas, etc., and by covering the lead wire with an insulator including a radio wave absorber. Is a structure that can be completely blocked by the electromagnetic wave absorber and prevents the intrusion of high-frequency noise into the shield case, and since the core wire of the lead wire between the detection device and the control device is also covered with the electromagnetic wave absorber, the conductor of the lead wire There is no possibility that high frequency noise will enter the shield case through.

According to a second aspect of the present invention, there is provided a detection device for detecting temperature, humidity, gas, etc., a control device, and a lead wire connecting the detection device and the control device, and the lead wire is insulated from a conductor. By covering the core wire covering the object with an insulator containing a radio wave absorber, the high frequency noise that tries to enter from the through hole of the shield case is absorbed by the radio wave absorber and the high frequency noise enters the shield case. Is a structure that can be completely cut off, and since the core wire of the lead wire between the detection device and the control device is also covered with the electromagnetic wave absorber, there is no possibility that high frequency noise will enter the shield case through the conductor of the lead wire.

According to a third aspect of the present invention, a driving mechanism is provided, and the detection device is configured such that the mounting position can be moved in a predetermined space by the driving mechanism, so that the temperatures of a plurality of food items can be detected. In addition, since it is not necessary to use a metal mesh or the like for the external signal line, the external signal line can be driven with a light force because it has flexibility.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of essential parts of a control device, a lead wire and a temperature detecting device of a high frequency heating apparatus according to a first embodiment of the present invention.

In FIG. 1, the temperature detector 7 and the controller 8 are connected by a lead wire 9. The temperature detecting device 7 is an infrared detecting element 10 for detecting infrared rays emitted from food.
A lens 11 for condensing infrared rays emitted from food on the infrared detecting element 10, a chopper 12 for periodically turning on and off the infrared rays, a motor 13 for rotationally driving the chopper 12, and an amplifier circuit for amplifying signals of the infrared detecting element 10. 14, an infrared detection element 10, an amplifier circuit 14, and a substrate 15 on which a motor is mounted, and these are shielded by a shield case A16 and a shield case B17 which are made of metal and have a box shape. An opening 18 for introducing infrared rays emitted from food is provided in a portion of the shield case A16 facing the lens. Core wire 19 of lead wire 9
The conductor is wired on the substrate 15. The core wire 19 of the lead wire 9 is covered with a coating 20 in which an insulating material such as silicon is mixed with a material having a property of absorbing radio waves such as ferrite. The lead wire 9 is drawn out of the shield case through a tubular gap formed by the shield case A16 and the shield case B17. The other end of the lead wire 9 is connected to a control device 21 that processes a signal from the temperature detection device 22 to calculate the temperature of the food, detects the finished state of the food, and controls the heating time of the food.

In the sectional view of the lead wire 9 shown in FIG.
The core wire 19 is a conductor 23 composed of a plurality of thin wires such as copper, and its periphery is insulated by a coating 24. 3 in FIG.
A core wire 19 of a book is used, and a coating 20 is provided around the core wire 19 in which an insulating material such as silicon is mixed with a material having a property of absorbing radio waves such as ferrite and metal whiskers.

FIG. 3 is a sectional view showing a mounting state of the temperature detecting device 22, the lead wire 9 and the control device 21 in the high frequency heating device. The food 28 is placed on a rotary plate 27 driven by a table drive motor 26 provided on the bottom surface of the heating chamber 25. The food 28 is heated by the high frequency generated by the high frequency generator 29. The temperature detecting device 22 is provided on the opening provided on the upper surface of the heating chamber 25, and the temperature detecting device 22 is moved left and right by the drive motor 30 to detect the temperature of the food 28 at a plurality of locations.

The operation and action of the high-frequency heating device configured as described above will be described below.

First, in FIG. 3, even if a weak high frequency leaked from the heating chamber 25 is present around the temperature detecting device 22, the coating 20 of the lead wire 9 is made of an insulating material containing a radio wave absorber. Since all weak high frequencies are absorbed, high frequency noise is not superimposed on the conductor 23. Further, since the lead wire 9 is strongly sandwiched between the shield case A16 and the shield case 17B, it is difficult to form a gap between the lead wire 9 and each of the shield cases A16 and B17, and high frequency noise enters the temperature detection device 22. There is no such thing. Further, by driving the temperature detecting device 22 by the drive motor 30, it is possible to detect the food temperature at a plurality of places of the food and it is not necessary to use a metal mesh or the like for shielding the lead wire 9. Is flexible and can be driven with a light force.

As described above, in the present embodiment, the lead wire for connecting the detection device and the control device has a structure in which the core wire in which the conductor is covered with the insulator is covered with the insulator including the electromagnetic wave absorber. . As a result, the high-frequency noise that tries to enter through the through-hole of the shield case is absorbed by the electromagnetic wave absorber, and the high-frequency noise that enters the shield case can be completely blocked. Since the core wire is also covered with the electromagnetic wave absorber, there is no possibility that high frequency noise will enter the shield case through the conductor of the lead wire. Further, since the lead wire is flexible, the lead wire does not have a large load even when the temperature detecting device is driven, and can be driven by a small motor.

Although the temperature detecting device using the infrared detecting element has been described in this embodiment, it is needless to say that the influence of the high frequency noise can be similarly eliminated when detecting the humidity or the gas concentration. Nor.

Although the metal shield case is described in this embodiment, any material having a shielding effect such as a resin containing carbon fiber may be used.

The radio wave absorber is not limited to ferrite, and may be any metal such as a metal whisker that absorbs radio waves.

[0022]

As described above, according to the present invention, the lead wire connecting the detection device and the control device has a structure in which the core wire in which the conductor is covered with the insulator is covered with the insulator including the electromagnetic wave absorber. As a result, the signal of the detection device can be reliably transmitted to the control device without being affected by high frequency noise, and a highly reliable high frequency heating device can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of main parts of a control device, a lead wire, and a temperature detection device of a high-frequency heating device of the present invention

FIG. 2 is a sectional view of a lead wire of the high-frequency heating device of the present invention.

FIG. 3 is a sectional view of the high-frequency heating device of the present invention.

FIG. 4 is an electric circuit diagram of a main part of a conventional high-frequency heating device.

[Explanation of symbols]

9 lead wire 10 Infrared detector 21 Control device 20 Coating including electromagnetic wave absorber 22 Temperature detector

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K086 AA04 CA02 CA04 CA20 CB04                       CB20 FA09 FA10                 3L086 BB20 CB12 CB17 DA18                 5E321 AA21 GG09

Claims (3)

[Claims] 1. A high-frequency heating device comprising: a lead wire for connecting a detection device for detecting temperature, humidity, gas, etc., wherein the lead wire is covered with an insulator containing a radio wave absorber. 2. A detection device for detecting temperature, humidity, gas, etc., a control device, and a lead wire for connecting the detection device and the control device, wherein the lead wire is a core wire in which a conductor is coated with an insulator. A high-frequency heating device configured to be covered with an insulator including an absorber. 3. The high-frequency heating device according to claim 1, further comprising a drive mechanism, wherein the detection device is configured such that the mounting position can be moved in a predetermined space by the drive mechanism.