KR20020010244A - Blocking Device of Electromagnetic Wave Radiation - Google Patents

Abstract

PURPOSE: An electromagnetic interference shielding device is provided to prevent erroneous operation of electronic device, while protecting a human body from the electromagnetic interference. CONSTITUTION: An electromagnetic interference shielding device is characterized in that a plurality of coils(30) are disposed onto a multiple layer structure constituted by a magnetic metallic plate(10) and a non-ferrous metallic plate(20), and each coil forms a serial closed circuit by using a lead wire(40). The coil is wound in the same direction at a bobbin and connected in serial. The coil is arranged to be perpendicular to the magnetic metallic plate and non-ferrous metallic plate.

Description

Blocking Device of Electromagnetic Wave Radiation

The present invention relates to a radiation shielding mechanism, and more particularly, by adding a voltage-free application coil to a non-ferrous and magnetic multilayer metal plate to simultaneously conduct electric and magnetic fields of electromagnetic waves in PC monitors, TVs, electronic and medical equipment, shielded rooms, and the like. The present invention relates to a shielding electromagnetic shielding mechanism capable of shielding, preventing malfunction of electronic products due to electromagnetic waves, preventing harmful effects of human body due to low frequency electromagnetic waves, and utilizing coil induced electricity as an energy source.

In general, a highly conductive Au, Al, Cu non-ferrous metal film is grounded for shielding a radiated electric field, and a magnetic metal film such as mumetal and amorphous, which has a high permeability, for shielding a radiated field (low frequency region). ) And Au, Al, Cu nonferrous metal films (high frequency region) having high conductivity are used.

In the shielding of radiated electric field, the radiated electric field strikes and reflects on the highly conductive metal and changes to conduction current and flows to the ground, which causes the shielding of the electric field. Perform attenuation.

In the radio frequency shielding, the magnetic field is attenuated by the inflow into the metal where the magnetic permeability of the radioactive magnetic field is high in the low frequency region. Shielded by eddy current effect.

As such, non-ferrous metals composed of electric field alone or magnetic field alone shielding and having excellent conductivity as electric field shielding, and magnetic metals having high magnetic permeability are used as magnetic field shielding. The disadvantage is that it is sensitive.

In addition, high permeability magnetic metal material for low frequency magnetic field shielding or silver (Au), which is the best for electric field shielding, is expensive, thereby increasing the cost of the product.

Therefore, an object of the present invention is to solve the above-mentioned disadvantages, by adding a voltage-free application coil to the non-ferrous and magnetic multilayer metal plate simultaneously to the electric field and magnetic field of electromagnetic waves in PC monitors, TVs, electronic and medical equipment, shielded rooms, etc. The present invention provides a radiation shielding mechanism that shields, prevents malfunction of electronic products due to electromagnetic waves, prevents harm to humans due to low frequency electromagnetic waves, and utilizes induction electricity of a coil as an energy source.

1 is a perspective view of a mechanism according to the present invention,

Figure 2 is a side view showing the connection state of the mechanism according to the invention,

Figure 3 is a graph measuring the induced voltage using the instrument according to the invention.

Explanation of symbols on the main parts of the drawings

10 magnetic metal plate 20 non-ferrous metal plate

30 coil 40 lead wire

In order to achieve this object, the present invention provides a device for shielding radiated electromagnetic waves of monitors, televisions, other electronics, and electrical devices and utilizing induced electrical energy: on multiple layers of magnetic metal plate 10 and nonferrous metal plate 20. A plurality of coils 30 are arranged, each coil 30 is characterized in that connected using a conductive wire 40 to form a closed circuit in series.

As another feature of the invention, the coils 30 are wound in the same rotational direction and attached in parallel with no voltage applied.

In this way, superior shielding is achieved at the same time, instead of solely shielding the electromagnetic field or the magnetic field of the radiated electromagnetic waves, thereby preventing malfunction of each electronic product and equipment and harmfulness of the human body.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a perspective view showing a mechanism according to the present invention, Figure 2 is a side view showing a connection state of the mechanism according to the present invention.

According to the present invention, the magnetic metal plate 10 is used alone or a multi-layered structure of the nonferrous metal plate 20 and the magnetic metal plate 10 is used. The magnetic metal plate 10 and the nonferrous metal plate 20 are arranged in the direction of the electromagnetic wave source, and a plurality of circular or square coils 30 are attached to one surface thereof.

Each coil 30 is wound on a bobbin of circular or square cross section in the same rotational direction and connected in series. The coils 30 are mounted in parallel with the magnetic metal plate 10 and the nonferrous metal plate 20 while being parallel to each other.

The attachment of the coil 30 causes Faraday's law and the law of the lens to generate the induction current of the coil due to the magnetic field component of the radiated electromagnetic wave, and the repulsive magnetic field caused by the induced current emits radiation as compared to the shielding method using only a metal layer. It further reduces the magnetic field of electromagnetic waves. Since the winding directions of the respective coils 30 are all in the same direction, the magnetic fields of the connected radiated electromagnetic waves are all attenuated simultaneously.

In addition, the increase in the saturation magnetic flux density of the magnetic metal hysteresis curve prevents the permeability decrease due to the decrease in the saturation magnetic flux density of the magnetic metal alone and increases the real permeability. The coil 30 acts as a kind of antenna, and absorbs and loses field energy of radiated electromagnetic waves, so that the coil 30 is more effective than electric field shielding using a conventional metal layer.

In addition, the induced electrical energy of the coil (see Table 1) can be usefully used via the circuit charging system.

As such, if the structure in which the no-voltage applying coil 30 is added is used rather than using only magnetic metal, non-ferrous or magnetic multilayer metal, it shows better simultaneous shielding effect of electric and magnetic fields of electromagnetic waves. When applied to electronic and medical equipment and other shielded rooms, it is possible to prevent the malfunction of electronic products due to electromagnetic waves and the harmful effects of the human body due to low frequency electromagnetic waves.

Figure 3 is a graph measuring the induced voltage using the instrument according to the present invention, and shows the measured waveform of the induced voltage (about 0.8V) of the oscilloscope.

In order to analyze the effect of the addition of eight coils 30 on the magnetic metal plate 10 and the non-ferrous metal plate 20, a method of acquiring a measured value according to an electromagnetic shielding experiment at about 15 cm from the side of the electron gun of a 15-inch PC monitor Choose. The magnetic metal plate 10 is a Mumetal (ferrous metal plate) 20 is made of Cu and grounded. The coil 30 is composed of a wire diameter of 0.4 mm, ten windings, and a diameter of 1 cm of a circular cross section. Such an instrument of the present invention is mounted and an electric field and a magnetic field are measured according to frequency using an electromagnetic field meter (EM field meter).

The results of the experiment are summarized in Table 1 and Table 2.

Unshielded Magnetic metal Mumetal and Coil Non Ferrous (Cu) and Magnetic Metals (Mumetal) Non Ferrous / Mumetal and Coil Band 1 (5㎐-2㎑) Magnetic field (nT) 1642 620 570 618 565 Electric field (V / m) 13.1 4.0 3.5 3.8 3.1 Band 2 (2㎑-400㎑) Magnetic field (nT) 413 226 189 215 165 Electric field (V / m) 10.9 2.1 1.7 2.1 1.7

In Table 1, in the case of the shielding shown in the left part, the influence of the electromagnetic wave is the most severe, and as in the far right, the magnetic metal plate 10, the nonferrous metal plate 20, and the coil 30 are constituted according to the method of the present invention. The effect is the best. It can be seen that the difference also appears depending on the presence or absence of the coil (30).

In Table 2, when the non-ferrous metal alone (Al) is used without the magnetic metal, the magnetic field is not shielded in the frequency band of band 1, and the magnetic field value is increased when the coil is added. In addition, it can be seen that the shielding of electromagnetic waves is insufficient when using paper instead of the magnetic metal plate 10 and the nonferrous metal plate 20 as shown in the far right.

Non Ferrous Metals (Al) Non Ferrous Metals (Al) and Coils Paper and coil Band 1 (5㎐-2㎑) Magnetic field (nT) 1642 1660 1640 Electric field (V / m) 3.9 3.1 12 Band 2 (2㎑-400㎑) Magnetic field (nT) 385 376 405 Electric field (V / m) 2.0 1.7 10

As such, in the structure of nonferrous / magnetic metals and coils, a repulsive magnetic field is generated due to the induced current of the coil, and the magnetic permeability is increased to have an excellent effect on shielding the magnetic field. At the same time, good field shielding due to multilayer reflection and field energy losses is achieved.

The induced energy of the attached coil 30 may be utilized for various purposes, such as a charging battery.

In addition, in the manufacturing process, a sensitive heat treatment process for increasing the real permeability of the magnetic metal may be omitted as in the prior art.

According to the above configuration and operation, the present invention adds a voltage-free application coil to a non-ferrous and magnetic multilayer metal plate to simultaneously shield electric and magnetic fields of electromagnetic waves in PC monitors, TVs, electronic and medical equipment, shielded rooms, and the like. It prevents malfunction of electronic products, prevents harmful effects of human body caused by low frequency electromagnetic waves, and has the effect of utilizing coil induced electricity as an energy source.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

Claims (2)

In appliances that shield radiated electromagnetic waves from monitors, televisions, other electronics and electrical devices and utilize induced electrical energy: A plurality of coils 30 are disposed on multiple layers of the magnetic metal plate 10 and the nonferrous metal plate 20, and each coil 30 is connected to form a closed circuit in series using the conductive wire 40. Radiated electromagnetic shielding mechanism. The method of claim 1, The coil 30 is wound in the same direction of rotation and radiated electromagnetic shielding mechanism, characterized in that attached in parallel with no voltage applied state.