JP2001157717A - Electric wave humidifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wave humidifier for household use to reduce radiation noises much more than conventional humidifiers. SOLUTION: In the electric wave humidifier 20 to humidify an object by putting it between two electrode plates 10 and supplying high-frequency electric current, this electric wave humidifier 20 is provided with an equilibrium output means, the two electrode plates 10 are connected to the output terminals of the electric wave humidifier by means of the center conductors of two coaxial cables 66, 67, respectively, a connection portion 65, connected to the side edge of the electric wave humidifier, of the outer covering conductors of the two coaxial cables is grounded to the frame body 21 of the electric wave humidifier and the outer covering conductors of the two coaxial cables are connected to each other (68) between the side edge of the electric wave humidifier and the side edge of the electrode plates 10. By the above structure, high-frequency electric current running through the outer covering conductors of the coaxial cables are expected to be decreased and thus radiation noises which affect electronics around can be reduced much more than conventional humidifiers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave heater for home use which can be used for thermal treatment of arms and legs.
The present invention relates to a radio wave heater for home use which irradiates a short-wave or ultra-short wave (HF to VHF) band electromagnetic wave to a heated object such as a body and generates heat by heating the tissue itself of the heated object such as a body by penetration of the electromagnetic wave. Things.

[0002]

2. Description of the Related Art Conventionally, there has been known a heating apparatus for heating a body by high-frequency induction heating based on the same principle as a microwave oven. Although this device is used for the purpose of suffocating cancer cells by applying high-power electromagnetic waves having an output of 200 to 500 W to an affected part, it is necessary to cool other parts of the human body surface due to the high power. In addition, the above-mentioned apparatus is for heating by vibrating water molecules, and usually uses electromagnetic waves in the UHF band of 2500 MHz. However, since the frequency has a short wavelength, it is difficult to warm a large object to be heated.

FIG. 4 is an explanatory view showing an example of using a radio wave heater for home use. In contrast to a heating device based on the same principle as that of the microwave oven, a radio wave heater for home use heats a large object 30 such as a human body.
7.17 MHz). The object to be heated 30 such as a human body is sandwiched between the electrode plates 10 in the two conductors 40, and a short-wave or ultrashort-wave (HF to VHF) band of about 40 W is applied between the main body 20 and the two electrode plates 10. The human body 30 is heated by flowing a high-frequency current.

When an electromagnetic wave is transmitted through a human body, water molecules in the human body vibrate, and the vibration of the water molecules generates frictional heat between the water molecules, thereby generating heat in the human body tissue itself. Since the electromagnetic wave sufficiently penetrates the human body, it can heat not only the surface of the human body but also a deep part of the human body. That is, the heat of the surface does not conduct to the inside, but the internal tissues of the human body generate heat. Therefore, the radio wave heater can efficiently heat a deep part of the body.

[0005]

FIG. 3 shows a conventional conductor 4.
It is explanatory drawing which shows the structure of the household electric wave heater using 0. In the conventional household electric wave heater described above,
Terminals 63 and 64 of the connector 62 and two coaxial cables 6 are connected between the electrode plate 10 and the output connector 61 of the main body.
6 and 67, the outer conductors of the coaxial cable are connected to each other, and are grounded to the frame ground (housing 21) of the main body 20 or the circuit ground via the terminal 65 of the connector. FIG. 3 illustrates a case where the main body side connector 61 and the conductor side connector 62 are separated, and by pushing the conductor side connector 62 into the main body side connector 61, the circuit output and the conductor side connector 62 are removed.
Of the main body side connector 61 and the terminal 65 of the conductor side connector 62 are respectively connected.

However, when a coaxial cable having a structure as shown in FIG. 3 is used, the radiation noise level from the cables 66 and 67 is high, which affects peripheral electronic devices such as a radio. was there. An object of the present invention is to solve the above-mentioned problems of the conventional radio wave heater and to provide a household radio wave heater capable of reducing radiation noise as compared with the conventional radio wave heater.

[0007]

According to the radio wave heater of the present invention, an object to be heated is sandwiched between two electrode plates, and a high-frequency current is supplied between the two electrode plates to provide an object to be heated. In the electric wave warmer for heating the electric wave, the electric wave heater has a balanced output means, and two electrode plates and two output terminals of the balanced output means of the electric wave heater are two coaxial cables. , The ends of the outer conductors of the two coaxial cables on the radio wave heater side are grounded to the housing of the radio wave heater, and the ends of the radio wave heater side and the electrode plate The outer conductors of the two coaxial cables are connected to each other between the side ends. Alternatively, the radio wave heater side ends of the outer conductors of the two coaxial cables are grounded to the housing of the radio wave heater via an impedance element.

In the present invention, it is presumed that the configuration described above reduces the high-frequency current flowing through the outer conductor of the coaxial cable, and as a result of experiments, it has been found that radiation noise affecting surrounding electronic devices can be reduced as compared with the related art. confirmed.

[0009]

Embodiments of the present invention will be described below in detail. FIG. 5 is a block diagram showing the configuration of the radio wave heater. The oscillation circuit 52 generates, for example, an AC signal of 27.17 MHz. The amplifying circuit 53 amplifies the AC signal using an amplifying element such as a transistor, for example.
Outputs about power. The filter circuit 54 is, for example, a band-pass filter including a coil and a capacitor for passing only a desired frequency (for example, 27.17 MHz).

The matching circuit 55 is used to efficiently irradiate the output of the amplification circuit 53 to the object to be heated.
Is a circuit for converting the output impedance of the above to the impedance between the conductors and outputting a balanced output. The matching circuit 55
For example, the matching is adjusted by rotating the variable condenser in the matching circuit by the motor 57. Two balanced output terminals of the matching circuit 55 (connector 60)
Are coaxial cables (66,
67) are connected to the electrode plates 10 of the two conductors 40. The level detection circuit 58 is a circuit that detects the level of the AC signal output from the output terminal.

The microcomputer 51 includes a CPU, R
An OM, a RAM, an analog / digital input / output circuit, and the like are provided. Based on an operation instruction from a panel circuit 59, output signal level information input from the level detection circuit 58 is A / D-converted.
After conversion, the motor 57 is controlled via the motor drive circuit 56 based on this level information so that the level information becomes the highest, for example. Then, using the built-in timer, to obtain the desired heating effect,
For example, the on / off of the output is controlled by turning on / off the operation of the oscillation circuit 52.

The panel circuit 59 includes an output setting switch,
An information input circuit such as a timer setting switch and a start / stop switch and a display circuit such as an output setting display lamp, a timer display, and an output level display lamp are provided. The DC power supply circuit 50 supplies DC power to each circuit in the device.

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, in the conductor of the present invention, the outer conductors are electrically connected in the middle of the two coaxial cables 66 and 67.

In the connector 62, which is the end of the outer conductor of the two coaxial cables 66 and 67 on the radio wave heater side, each of the outer conductors is connected to the casing of the radio wave heater 20 via the ground terminal 64 of the connector. It is grounded to the body 21. In the present invention, the outer conductors of the two coaxial cables 66 and 67 are further connected (68) between the radio wave heater side end and the electrode plate side end. The connection method can be implemented by, for example, soldering the outer conductors or caulking the outer conductors of the two coaxial cables 66 and 67 together with a metal ring.

The reason that the radiation noise is reduced by this configuration is presumed as follows. That is, the output of the radio wave heater is a balanced output, and a high-frequency current having an opposite phase flows between the core wires of the two coaxial cables 66 and 67. A capacitance 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 in the connector 62.

Therefore, conventionally, the high-frequency current output from the main body 20 is conventionally, for example, the core wire of the coaxial 66 → the capacitance component of the coaxial 66 → the outer sheath of the coaxial 66 → the ground terminal of the connector 62 → the coaxial 67.
Flow through the route of outer skin → capacitive component of coaxial 67 → core wire of coaxial 67. 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 presumed that the outer sheath of the two coaxial cables acts as an antenna, and electromagnetic waves are radiated.

In this embodiment, the outer conductors are connected to each other at an intermediate position between the two coaxial cables 66 and 67 (6).
8) It is considered that the route through which the high-frequency current flows is shortened, and the antenna function is reduced, resulting in a reduction in radiation noise. Therefore, when implementing the present invention, it is considered 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 should be increased as much as possible, or the connection should be made continuously. Doing so seems to be more effective.

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. 20 housings 21
At the point where it is grounded. 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 sheath is connected to the ground terminal 64 of the connector, and the main body corresponding to the ground terminal 64 The terminal of the side connector 61 is connected to the radio wave heater 20 via a capacitor 69.
Are grounded. As a result of an experiment, it has been found that the capacitance of the capacitor 69 has an effect of reducing radiation noise at about several hundred picofarads.

In FIG. 61, the structure in which the capacitor 69 is inserted into the main body side connector 61 is disclosed. However, for example, a capacitor can be inserted into the conductor side connector 62. May use a normal connector, and connect the connection terminal of the connector and the frame ground 21 with a capacitor.

The reason that the radiation noise is reduced by this configuration is presumed as follows. That is, as described above,
The high-frequency current output from the main body 20 is, for example, coaxial 66
, The capacitance component of the coaxial 66 → the outer sheath of the coaxial 66 → the grounding terminal of the connector 62 → the outer sheath of the coaxial 67 → the capacitive component of the coaxial 67 → the core of the coaxial 67 flows. Here, if 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,
1 is considered to be a neutral point with respect to the high-frequency output current, and the current flowing through the outer sheath of the coaxial 66 or the coaxial 67 and the housing 21 act as an antenna, and the high-frequency current flows.
It is presumed that electromagnetic waves are emitted.

In this embodiment, the connection point 64 between the outer conductors of the two coaxial cables 66 and 67 and the housing 2
It is considered that the insertion of the capacitor 69, which is an impedance element, between the elements 1 reduces the high-frequency current and reduces radiation noise. However, when the connection point 64 between the outer conductors of the two coaxial cables 66 and 67 and the housing 21 of the main body are completely separated, radiation noise increases. Therefore, when practicing the present invention, it is necessary to experimentally determine the type (capacitor, coil, resistor or a combination thereof) and value of the element that minimizes radiation noise as an impedance element. With the above configuration and operation, the intensity of the electromagnetic wave radiated from the electric wave heater can be reduced as compared with the related art.

While the embodiment of the present invention has been disclosed above, the present invention may have the following modifications. Although the first and second embodiments have been disclosed as the embodiments, the techniques of the two embodiments may be implemented in combination. In the first embodiment, two coaxial cables are used. For example, two central conductors are included in one outer conductor between the connector 62 and the connection point 68 between the outer sheaths in FIG. It is also possible to use such a coaxial cable, or to bundle two coaxial cables and cover them with an outer conductor. In the examples,
Although an example in which the present invention is applied to an apparatus for heating a human body has been disclosed, the present invention is applicable to any heating apparatus that heats an object to be heated by flowing a high-frequency current between electrodes.

[0023]

As described above, in the present invention,
An object to be heated is sandwiched between two electrode plates, and a high-frequency current is supplied between the two electrode plates to heat the object to be heated. The outer conductors of the two coaxial cables are connected between the end portions on the electrode plate side. Alternatively, the radio wave heater side ends of the outer conductors of the two coaxial cables are grounded to the housing of the radio wave heater via an impedance element. In the present invention, it is estimated 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 an experiment, there is an effect that radiation noise affecting surrounding electronic devices is reduced as compared with the related art. It was confirmed that.

[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 the guide 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 a usage example of a radio wave heater for home use.

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 heater main body, 21 ... Housing, 3
0 ... 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, 6
3, 64: connector terminal, 65: ground terminal, 66, 67
... coaxial cable, 68 ... connection, 69 ... capacitor

Claims (3)

[Claims] 1. A radio wave heater for heating an object to be heated by sandwiching the object to be heated between two electrode plates and supplying a high-frequency current between the two electrode plates. The warmer includes balanced output means, and the two electrode plates and two output terminals of the balanced output means of the radio wave heater are connected by center conductors of two coaxial cables, respectively. The radio wave heater side end of the outer conductor of the coaxial cable is grounded to the radio wave heater housing, and further, between the radio wave heater side end and the electrode plate side end,
A radio wave heater wherein outer conductors of the two coaxial cables are connected to each other. 2. An electric wave heater for heating an object to be heated by sandwiching the object to be heated between two electrode plates and supplying a high-frequency current between the two electrode plates. The warmer includes balanced output means, and the two electrode plates and two output terminals of the balanced output means of the radio wave heater are connected by center conductors of two coaxial cables, respectively. A radio wave heater characterized in that an end of the outer conductor of the coaxial cable on the side of the radio wave heater is grounded to a housing of the radio wave heater via an impedance element. 3. The radio wave heater according to claim 2, wherein said impedance element is a capacitor.