JP4426037B2 - Radio wave heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home-use radio wave warmer that can be used for heat treatment of arms and legs, and irradiates an object to be heated such as a short wave or a very short wave (HF to VHF) band with the electromagnetic wave. The present invention relates to a home-use electric wave heater that generates heat by heating the tissue of a heated object such as a body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a warming device that warms a body by high-frequency induction heating based on the same principle as a microwave oven is known. This device is used for the purpose of suffocating and killing cancer cells by applying a high-power electromagnetic wave with an output of 200 to 500 W to the affected area. However, because of the high output, it is necessary to cool other parts of the human body surface. Further, the above-mentioned device warms water molecules by vibrating, and normally uses an electromagnetic wave in the UHF band of 2500 MHz. However, since the frequency of the frequency is short, it is difficult to warm a large object to be heated.
[0003]
FIG. 4 is an explanatory diagram showing a usage example of a home-use radio wave warmer. In contrast to the heating device based on the same principle as the microwave oven, a home electric wave heater uses an electromagnetic wave in the HF to VHF band (for example, 27.17 MHz) to warm a large object 30 such as a human body. Yes. Then, a heated object 30 such as a human body is sandwiched between the electrode plates 10 in the two conductors 40, and a short wave or very high frequency (HF to VHF) band of about 40 W is provided between the main body 20 and the two electrode plates 10. The human body 30 is heated by flowing a high-frequency current.
[0004]
When electromagnetic waves are transmitted through the human body, the water molecules in the human body vibrate, the frictional heat between the water molecules is generated by the vibration of the water molecules, and the human body tissue itself generates heat. Since the electromagnetic waves are sufficiently transmitted through the human body, not only the surface of the human body but also the deep part of the human body can be heated. That is, the heat of the surface is not conducted to the inside, but the internal tissue of the human body itself generates heat. Therefore, the radio wave heater can efficiently warm the deep part of the body.
[0005]
[Problems to be solved by the invention]
FIG. 3 is an explanatory diagram showing the configuration of a home-use radio wave heater using the conventional conductor 40. In the conventional home electric wave warmer described above, the electrode plate 10 and the output connector 61 of the main body are connected by the terminals 63 and 64 of the connector 62 and the central conductors of the two coaxial cables 66 and 67. The outer conductors of the coaxial cable were connected to each other and grounded to the frame ground (housing 21) or the circuit ground of the main body 20 via the terminal 65 of the connector. FIG. 3 shows a case where the main body side connector 61 and the conductor side connector 62 are separated from each other. By pushing the conductor side connector 62 into the main body side connector 61, the circuit output and the conductor side connector 62 are shown. The terminals 63 and 64, and the ground terminal of the main body side connector 61 and the terminal 65 of the conductor side connector 62 are connected to each other.
[0006]
However, when the coaxial cable having the structure as shown in FIG. 3 is used, there is a problem that the radiation noise level from the cables 66 and 67 and the like is high, which affects the surrounding electronic equipment such as a radio. .
An object of the present invention is to solve the problems of the conventional radio wave heater and provide a home radio wave heater that can reduce radiation noise as compared with the conventional one.
[0007]
[Means for Solving the Problems]
The radio wave warmer of the present invention is a radio wave warmer for heating an object to be heated by sandwiching an object to be heated between two electrode plates and supplying a high frequency current between the two electrode plates. The radio wave warmer includes balanced output means, and the two electrode plates and the two output terminals of the balanced output means of the radio wave heater are respectively connected by central conductors of two coaxial cables. The radio wave heater side end of the outer conductor of the coaxial cable is grounded to the case of the radio wave warmer, and further, two wires are provided between the radio wave heater side end and the electrode plate side end. The outer conductors of the coaxial cable are connected to each other. Alternatively, the radio wave warmer side end portions of the outer conductors of the two coaxial cables are grounded to the case of the radio wave warmer via an impedance element.
[0008]
In the present invention, it is presumed that the high-frequency current flowing in the outer conductor of the coaxial cable is reduced by the above configuration, and as a result of the experiment, it was confirmed that the radiation noise affecting the surrounding electronic devices can be reduced as compared with the conventional case. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail. FIG. 5 is a block diagram showing the configuration of the radio wave warmer. The oscillation circuit 52 generates an AC signal of 27.17 MHz, for example. The amplifying circuit 53 amplifies the AC signal using an amplifying element such as a transistor, and outputs about 40 w of power. The filter circuit 54 is a band-pass filter composed of, for example, a coil and a capacitor for allowing only a desired frequency (for example, 27.17 MHz) to pass therethrough.
[0010]
The matching circuit 55 is a circuit that converts the output impedance of the amplifier circuit 53 into impedance between conductors and outputs the balanced output in order to efficiently irradiate the object to be heated with the output of the amplifier circuit 53. The matching circuit 55 adjusts the matching by rotating the variable capacitors in the matching circuit by the motor 57, for example. The two balanced output terminals (connector 60) of the matching circuit 55 are connected to the electrode plates 10 of the two conductors 40 by coaxial cables (66, 67) each having an external conductor grounded. The level detection circuit 58 is a circuit that detects the level of the AC signal output from the output terminal.
[0011]
The microcomputer 51 includes a CPU, a ROM, a RAM, an analog / digital input / output circuit, etc., and performs A / D conversion on the output signal level information input from the level detection circuit 58 based on an operation instruction from the panel circuit 59. Based on the level information, the motor 57 is controlled via the motor drive circuit 56 so that the level information becomes the highest, for example. Then, on / off of the output is controlled by turning on / off the operation of the oscillation circuit 52, for example, so as to obtain a desired heating effect using a built-in timer.
[0012]
The panel circuit 59 is equipped with information input circuits such as an output setting switch, a timer setting switch, and a start / stop switch, and display circuits such as an output setting display lamp, a timer display, and an output level display lamp. The DC power supply circuit 50 supplies DC power to each circuit in the apparatus.
[0013]
FIG. 1 is a front view showing the structure of a first embodiment of a conductor to which the present invention is applied. The difference between the conductor of the first embodiment and the conventional conductor is that the outer conductors are electrically connected in the middle of the two coaxial cables 66 and 67 in the conductor of the present invention.
[0014]
In the connector 62 which is the end portion of the outer conductor of the two coaxial cables 66 and 67 on the side of the radio wave warmer, each outer conductor is connected to the casing 21 of the radio wave heater 20 via the ground terminal 64 of the connector. Grounded. In the present invention, the outer conductors of the two coaxial cables 66 and 67 are connected (68) between the radio wave warmer side end and the electrode plate side end. The connection method can be implemented by soldering the outer conductors, for example, or caulking the outer conductors of the two coaxial cables 66 and 67 together with a metal ring.
[0015]
The reason why the radiation noise is reduced by this configuration is estimated as follows. That is, the output of the radio wave warmer is a balanced output, and high-frequency currents having opposite phases flow between the core wires of the two coaxial cables 66 and 67. A capacitive component exists between the center conductor and the outer conductor of each of the coaxial cables 66 and 67, and the outer conductors are connected within the connector 62.
[0016]
Therefore, the high-frequency current output from the main body 20 is conventionally, for example, the core of the coaxial 66 → the capacitive component of the coaxial 66 → the outer skin of the coaxial 66 → the ground terminal of the connector 62 → the outer skin of the coaxial 67 → the capacitive component of the coaxial 67 → coaxial 67. It flows by the route called the heart line.
However, since the current flowing through the outer skin of the coaxial 66 and the current flowing through the outer skin of the coaxial 67 are in opposite phases, it is estimated that the outer skins of the two coaxial cables act as antennas and radiate electromagnetic waves.
[0017]
In this embodiment, the outer conductors are connected (68) at the intermediate position between the two coaxial cables 66 and 67, whereby the route through which the high-frequency current flows is shortened and the antenna action is reduced. It is thought to decrease. Therefore, when practicing the present invention, it seems that it is more effective to connect the outer skins as close to the electrode plate 10 as possible. Further, the number of connection points 68 is increased as much as possible, or the connection is continuously performed. It seems that it is more effective.
[0018]
FIG. 2 is a front view showing the structure of a second embodiment of the conductor to which the present invention is applied. The difference between the conductor of the second embodiment and the conventional conductor is that in the conductor of the present invention, in the connector 61, the outer conductors of the two coaxial cables 66 and 67 are connected via a capacitor 69 to a radio wave heater. It is in the point which earth | grounded to the housing | casing 21 of 20. FIG.
In the connector 62, which is the radio wave heater side end of the outer conductor of the two coaxial cables 66 and 67, each outer shell is connected to the ground terminal 64 of the connector, and the main body corresponding to the ground terminal 64. A terminal of the side connector 61 is grounded to the casing 21 of the radio wave warmer 20 via a capacitor 69. As a result of experiments, it has been found that the capacitance of the capacitor 69 is about a few hundred picofarads and has a radiation noise reduction effect.
[0019]
In FIG. 61, the configuration in which the capacitor 69 is inserted into the main body side connector 61 is disclosed. However, for example, it is possible to insert a capacitor into the conductor side connector 62. A connector may be used, and the connection terminal of the connector and the frame ground 21 may be connected by a capacitor.
[0020]
The reason why the radiation noise is reduced by this configuration is estimated as follows. That is, as described above, the high-frequency current output from the main body 20 is, for example, the core of the coaxial 66 → the capacitive component of the coaxial 66 → the outer sheath of the coaxial 66 → the ground terminal of the connector 62 → the outer sheath of the coaxial 67 → the capacitive component of the coaxial 67. → It flows along the route of coaxial 67 core wire.
Here, when the ground terminal 65 of the connector 62, which is a connection point between the outer conductors, is connected to the housing 21 of the main body, the housing 21 of the main body 20 becomes a neutral point with respect to the high-frequency output current. It is presumed that the current flowing through the outer surface of the coaxial 66 or the coaxial 67 and the casing 21 act as an antenna, a high-frequency current flows, and an electromagnetic wave is radiated.
[0021]
In the present embodiment, the high frequency current is reduced by inserting a capacitor 69 as an impedance element between the connection point 64 of the outer conductors of the two coaxial cables 66 and 67 and the casing 21 of the main body. It is considered that radiation noise is reduced. However, if the connection point 64 between the outer conductors of the two coaxial cables 66 and 67 and the casing 21 of the main body are completely separated, the radiation noise increases. Therefore, when implementing the present invention, it is necessary to experimentally determine the type of element (capacitor, coil, resistor, or combination thereof) and the value that will most reduce the radiation noise as the impedance element.
With the configuration and operation as described above, the intensity of the electromagnetic wave radiated from the radio wave heater can be reduced as compared with the prior art.
[0022]
As mentioned above, although the Example of this invention was disclosed, the following modifications can also be considered to this invention. As the embodiments, the first and second embodiments have been disclosed, but the techniques of the two embodiments can also be implemented in combination.
In the first embodiment, two coaxial cables are used. For example, two central conductors are provided in one outer conductor between the connector 62 in FIG. The coaxial cable may be used, or two coaxial cables may be bundled and further covered with an outer conductor.
In the embodiment, an example in which the present invention is applied to an apparatus for heating a human body has been disclosed. However, the present invention is not limited to any heating that heats an object to be heated by passing a high-frequency current between electrodes. Applicable to the device.
[0023]
【The invention's effect】
As described above, in the present invention, the object to be heated is sandwiched between two electrode plates, and the object to be heated is heated by supplying a high-frequency current between the two electrode plates. In this device, the outer conductors of two coaxial cables are connected to each other between the radio wave warmer side end and the electrode plate side end. Alternatively, the radio wave warmer side ends of the outer conductors of the two coaxial cables are grounded to the casing of the radio wave warmer via an impedance element.
In the present invention, it is presumed that the high frequency current flowing through the outer conductor of the coaxial cable is reduced by the above configuration, and as a result of the experiment, there is an effect that the radiation noise affecting the surrounding electronic devices is reduced as compared with the conventional case. It was confirmed.
[Brief description of the drawings]
FIG. 1 is a front view showing the structure of a first embodiment of a conductor to which the present invention is applied.
FIG. 2 is a front view showing a structure of a second embodiment of a conductor to which the present invention is applied.
FIG. 3 is an explanatory diagram showing a configuration of a radio wave heater using a conventional conductor 40;
FIG. 4 is an explanatory diagram showing an example of use of a home electric wave warmer.
FIG. 5 is a block diagram showing a configuration of a radio wave heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Electrode plate, 20 ... Radio wave warmer main body, 21 ... Housing, 30 ... Human body, 40 ... Conductor, 50 ... DC power supply circuit, 51 ... Microcomputer, 52 ... Oscillation circuit, 53 ... Amplification circuit, 54 ... Filter circuit, 55 ... matching circuit, 56 ... motor drive circuit, 57 ... motor, 58 ... level detection circuit, 59 ... panel circuit, 60-62 ... connector, 63, 64 ... connector terminal, 65 ... ground terminal, 66, 67 ... Coaxial cable, 68 ... Connection, 69 ... Capacitor

Claims (1)

In a radio wave heater that heats an object to be heated by sandwiching an object to be heated between two electrode plates and supplying a high frequency current between the two electrode plates,
The radio wave warmer includes balanced output means,
The two electrode plates and the two output terminals of the balanced output means of the radio wave heater are respectively connected by center conductors of two coaxial cables,
The radio wave warmer side ends of the outer conductors of the two coaxial cables are connected to each other, and the connection point is grounded to the case of the radio wave warmer via a capacitor. A radio wave heater.

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