JP2001131811A - Electromagnetic wave-shielding clothing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject piece of clothing aiming at preventing electromagnetic wave effect on the human body due to a high-frequency electromagnetic field radiated from antennas of e.g. portable telephones, radio equipment placed near the human body, and capable of not only preventing electromagnetic wave effect on the human body but also effectively preventing the malfunction of a medical equipment implanted in the human body such as a pacemaker. SOLUTION: This piece of clothing is characterized by that the clothing form is designed and made so as to gain desirable electromagnetic wave- shielding characteristics through measurement with an evaluation equipment for measuring electromagnetic wave-shielding characteristics in a clothing form which can measure electromagnetic wave-shielding characteristics in a clothing- worn condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shield for preventing the influence of electromagnetic waves on a human body due to a high-frequency electromagnetic field radiated from an antenna placed near the human body such as a portable telephone or a wireless device. The present invention relates to clothing, and furthermore, the present invention not only can protect the influence of electromagnetic waves on the human body, but also effectively acts on the prevention of malfunction of medical equipment implanted in the body, such as a pacemaker.

[0002]

2. Description of the Related Art Conventionally, measurement of electromagnetic wave shielding characteristics of an electromagnetic wave shielding garment using a conductive fiber thread for the purpose of preventing the effects of electromagnetic waves on the human body and medical devices implanted in the body. Has been carried out on a material piece of electromagnetic wave shielding clothes using an electromagnetic wave shielding characteristic measuring and evaluating apparatus such as the KEC method and the Advantest method which are generally widely used.

[0003] However, even if a predetermined piece of electromagnetic wave shielding property is obtained in a material piece of an electromagnetic wave shielding garment using a conductive fiber thread, depending on the shape of the garment, the predetermined electromagnetic wave shielding property may be obtained due to the infiltration or penetration of the electromagnetic wave. I was not satisfied.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to measure a desired electromagnetic wave by measuring with an electromagnetic wave shielding characteristic measuring and evaluating apparatus in a clothes shape. An object of the present invention is to provide an electromagnetic wave shielding garment that is designed and manufactured so as to obtain a shielding characteristic and is not affected by the sneaking, penetration, etc. of an electromagnetic wave.

[0005]

That is, according to the present invention, by measuring an electromagnetic wave shielding characteristic in a clothes shape, which can measure an electromagnetic wave shielding characteristic in a state in which clothes are worn, a desired evaluation is performed. It is characterized by designing and manufacturing clothing shapes so as to obtain electromagnetic wave shielding characteristics.

[0006] An apparatus for measuring and evaluating electromagnetic wave shielding characteristics in the form of clothes comprises a signal transmitter for generating a high-frequency signal, a transmitting antenna connected to the high-frequency signal transmitter for radiating a high-frequency electromagnetic field to free space, A simulated living body whose shape and electric constants such as permittivity and magnetic permeability are substantially equal to the actual human body,
It is installed at a predetermined position inside the simulated living body, receives a high-frequency electromagnetic field, has an impedance equivalent to the living body, and has a shape substantially equivalent to a lead wire of an implantable device implanted in an actual human body And a signal receiver connected to the receiving antenna for receiving a high-frequency signal.

[0007] Furthermore, the electromagnetic wave shielding characteristics of the clothing shape are 15 dB or more when the distance between the transmitting antenna and the pseudo-living body is 5 cm, 18 dB or more when the distance is 10 cm, and 20 dB or more when the distance is 20 cm compared to when the clothing is not worn. The shield effect is that the clothing shape is a shape that does not generate a gap when worn, the shape that does not generate a gap when worn is underwear or a T-shirt, and that malfunction of the cardiac pacemaker is prevented. Each has its own characteristics.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-described configuration, as an apparatus for measuring and evaluating electromagnetic wave shielding characteristics in the form of clothes, an electromagnetic wave shielding characteristic measuring and evaluating apparatus (Japanese Patent Application No. 11-249673) filed by the present applicant is preferable. Can be used. That is, as an apparatus for measuring and evaluating electromagnetic wave shielding characteristics in a clothing shape, a signal transmitter for generating a high-frequency signal, a transmitting antenna connected to the high-frequency signal transmitter and emitting a high-frequency electromagnetic field to free space, A simulated living body whose electric constants such as permittivity and magnetic permeability are substantially equal to the actual human body, are provided at a predetermined position inside the simulated living body, receive a high-frequency electromagnetic field, and further have an impedance equivalent to the living body, And a receiving antenna having a shape substantially equivalent to a lead wire of an implantable device implanted in an actual human body, and a signal receiver connected to the receiving antenna for receiving a high-frequency signal. It is possible to measure the electromagnetic wave shielding characteristics with respect to electromagnetic wave propagation from a desired position, angle, and distance by wearing an electromagnetic wave shielding garment as the target object. By measuring with this electromagnetic wave shield characteristic measuring and evaluating apparatus, it is possible to design and manufacture a clothing shape so as to obtain desired electromagnetic wave shield characteristics which are not affected by the sneaking, penetration, etc. of electromagnetic waves.

The electromagnetic wave shielding clothing of the present invention is made by using a knitted, woven, non-woven or net-like fabric using conductive fiber yarns. It has excellent shielding characteristics. Further, as the conductive fiber yarn, a yarn obtained by fiberizing a conductive resin such as polyacetylene, or nylon,
A thread obtained by applying a conductive resin such as polyacetylene to a synthetic fiber such as polyester, acrylic, or polypropylene, or a thread obtained by applying a metal component such as gold, silver, copper, or nickel by vacuum evaporation, sputtering, electroless plating, or coating. Examples thereof include fine wires of metal such as stainless steel, gold, silver, and copper, and in particular, synthetic fibers obtained by electrolessly plating silver on silver are preferable.

The electromagnetic wave shielding clothing of the present invention can be obtained by cutting and sewing a cloth having excellent near-field electromagnetic shielding properties even as a single cloth as described above.
It is preferable that the conductive fiber yarns of each part constituting the garment be in contact with each other and be sewn so as to be conductive. Also,
As for the shape of the clothes, in the case of a shape such as a button on the front body such as a Y-shirt, a gap is formed at the time of wearing, and electromagnetic waves penetrate through the gap. Is unfavorable because a product satisfying the above is not obtained. Furthermore, in the case of using a conductive material such as an apron that covers only the front of the human body, the electromagnetic wave wraps around the conductive material, and such a shape can also satisfy the electromagnetic wave shielding characteristics when worn. Is not preferred since

That is, the shape of the electromagnetic wave shielding clothing of the present invention is measured by an electromagnetic wave shielding characteristic measuring and evaluating apparatus in the shape of the clothing, and a desired electromagnetic wave shielding characteristic which is not affected by the wraparound, infiltration or the like of the electromagnetic wave can be obtained. Any clothing shape may be used, and preferably, a conductive material is used over the entire upper garment shape. Shapes that do not occur.
Further, more preferably, the shape of underwear or a T-shirt or the like, and most preferably, the shape of a long-sleeve high neck or the like is preferable because it can prevent invasion of electromagnetic waves from the cuffs and around the neck. The material and configuration of the electromagnetic shielding clothing of the present invention are not particularly limited to those described above.

[0012]

The present invention will be described below in more detail with reference to Examples and Comparative Examples. In addition, each following example does not limit this invention. The evaluation of the electromagnetic wave shielding characteristics in the following examples and comparative examples is described in (1) to (1) below.
The method of (3) was used.

(1) Material Electromagnetic Wave Shielding Property (KEC Method) A material (20 cm × 20 cm ×) to be measured between antennas in a shield box (MB8602B; manufactured by Anritsu Corporation) in which a transmitting antenna and a receiving antenna are installed in a short distance. 2
0 cm), and transmitted at different frequencies in the range of 100 MHz to 1 GHz, and the attenuation at each frequency was measured with a spectrum analyzer (TR4173; manufactured by Advantest). The performance evaluation was performed at 800 MHz, which is one frequency band of the mobile phone, by the difference (dB) between the case where the material was not sandwiched and the case where the material was sandwiched.

(2) Clothing Shape Electromagnetic Wave Shielding Property The clothing shape electromagnetic wave shielding characteristics were measured in an anechoic chamber using the measurement system shown in FIG. That is, a receiving antenna 4 (a 500 Ω load resistor is connected to the end of a coaxial cable so as to have an impedance equivalent to that of a living body at a desired position inside the coaxial cable, and the shape of the coaxial cable is a cardiac pacemaker to be operated in the body. Simulated living body 2 (which simulates the shape of a lead wire) is widely used in human-equivalent containers molded with FRP having a relative dielectric constant of 3 as having an electric constant such as a dielectric constant equivalent to that of a living body. 0.5% Na
A transmission antenna 3 (R3551; manufactured by Advantest Co., Ltd.) installed at a desired position, angle, and distance from the signal transmitter 5 with or without the electromagnetic wave shielding clothing 1 on a Cl-filled solution. A high frequency power of 800 MHz is applied via a dipole antenna TR1722 (manufactured by Advantest), and the attenuation state of the transmission power is checked by the signal receiver 6 (spectrum analyzer R3).
361A; Advantest). The position, angle and distance of the transmitting antenna 3 are in front of the simulated living body 2 and at the same height as the receiving antenna 4, and the angle of the transmitting antenna 3 is set so that the element is horizontal to the ground and 5cm from living body 2 and 10c
m and 20 cm. These conditions are the conditions where the most remarkable difference appeared in the electromagnetic wave shielding characteristics in the clothing shape. The performance evaluation was made based on the difference (dB) between the case where the electromagnetic wave shielding clothing was not worn and the case where the electromagnetic shielding clothing was worn.

(3) Analysis of electromagnetic field distribution by FDTD method FDTD method analysis simulator (XFD manufactured by REMCOM)
TD5.0 Bio-Pro), 10 mm × 10
600mm × 40 divided by a cube of mm × 10mm
In a free space of 0 mm × 700 mm, conductivity 1.43,
A 300 mm x 100 mm x 500 mm torso with a relative dielectric constant of 53 defines a simulated living body having a structure with a neck and an arm, and radiates a sine wave at a frequency of 800 MHz from a half-wave dipole antenna placed horizontally 50 mm forward from the living body. About 10 ns after reaching the steady state, the magnetic field intensity distribution within 15 mm from the body surface (the depth at which the pacemaker is implanted)
(Hz component, XZ cross section) was obtained. As the analysis model, a model of each shield garment shown in Table 1 was used. Further, the conductivity of the model was set to σ = 1 × 10 ⁵ S / m, which is almost the same as the conductivity of the shield clothing, and the gap between the model and the simulated living body was set to 5 mm. The evaluation was performed based on the coloration around the chest in the analysis result diagrams (FIGS. 2 to 6). In addition,
The magnetic field intensity is higher in the order of red>orange>yellow>green> blue, that is, the warm color system has more electromagnetic waves.

[0016]

[Table 1]

Example 1 A silver-plated nylon fiber yarn (X-st manufactured by SAUQUIT) was used as the conductive fiber yarn.
atic 100 denier / 34 filaments) and elastic fiber yarn (20d polyurethane yarn as a core yarn)
0d nylon yarn covered with a single covering yarn) and 80th cotton yarn, and the ratio of silver-plated nylon yarn: single covering yarn is 1:
In step 1, knitting was performed to obtain a reversible plain knitted fabric knitted on the front side of the knitted fabric and on the back side (skin side) of the knitted fabric. The knitted fabric was cut and sewn by a conventional method to prepare a short-sleeve round neck underwear. The knitted fabric is used for the neck tape and the sleeve tape of the undergarment, and the knitted fabric of the cotton thread is folded back to the skin side, and the surface side of the body fabric, the neck tape, and the silver-plated nylon of the sleeve tape are further used. The fabric was sewn so as to be in contact with the knitted fabric containing the yarn.

With respect to the reversible flat knitted fabric, the electromagnetic wave shielding property of the material is measured by the method (1), and further, the short-sleeve round neck underwear is worn by a simulated living body, and then garmented by the method (2). The shape electromagnetic wave shielding property was measured, and the electromagnetic wave shielding performance was evaluated. Table 2 shows the evaluation results. FIG. 2 shows the results of the electromagnetic field distribution analysis of the above (3) using the model of the short sleeved round neck underwear.

[0019]

[Table 2]

Example 2 Using the reversible flat knitted fabric obtained in Example 1, a short-sleeved V-neck undergarment was produced in the same manner as in Example 1 except that the shape of the neck was a V-neck. After the short-sleeved V-neck underwear was worn on the simulated living body, the electromagnetic wave shielding performance was evaluated by measuring the electromagnetic wave shielding property of the clothing shape by the method (2) described above. The evaluation results are also shown in Table 2. FIG. 3 shows the result of the electromagnetic field distribution analysis of the above (3) using the model of the short sleeve V-neck underwear.

(Comparative Example 1) Silver-plated nylon fiber (X-stat manufactured by SAUQUIT) was used as the warp and the weft.
ic) blended conductive fiber yarn (manufactured by Kanebo Fiber Co., Ltd.)
A Y-shirt-shaped electromagnetic wave shielding garment (protective clothing for a cardiac pacemaker such as a cellular phone manufactured by MHP) made of a plain weave fabric using X-age) was used. For the woven fabric, the material electromagnetic wave shielding property was measured by the method of (1), and further, for the Y-shirt-shaped electromagnetic wave shielding clothing, the garment was worn by a simulated living body, and then the garment-shaped electromagnetic wave shielding was performed by the method of (2). The performance was measured, and the electromagnetic wave shielding performance was evaluated. These evaluation results are also shown in Table 2. FIG. 4 shows the results of the electromagnetic field distribution analysis of the above (3) using the model of the Y-shirt-shaped electromagnetic wave shielding clothing.

(Comparative Example 2) Reticulated fabric in which silver was coated on polyester fiber (MG net manufactured by Freesia)
Vest-shaped electromagnetic wave shielding clothes (MG Vest, manufactured by Freesia) were used. The material electromagnetic wave shielding property of the net-like cloth was measured by the method (1), and the vest-like electromagnetic wave shielding clothes were worn on a simulated living body, and then the clothing shape electromagnetic wave shielding property was measured by the method (2). Was measured, and the electromagnetic wave shielding performance was evaluated. These evaluation results are also shown in Table 2.
FIG. 5 shows a result of the electromagnetic field distribution analysis of the above (3) using a model of the vest-shaped electromagnetic wave shielding clothing.

(Comparative Example 3) FIG. 6 shows the result of the electromagnetic field distribution analysis of the above (3) using a model in which the electromagnetic wave shielding clothing is not worn on the simulated living body.

As is clear from Table 2, the material electromagnetic wave shielding properties of the reversible flat knitted fabric obtained in Example 1 is as follows.
Compared to the woven fabric of Comparative Example 1 and the net-like fabric of Comparative Example 2, although they are comparable (slightly better in Example 1), but compared the clothing shape electromagnetic wave shielding properties,
Examples 1 and 2 are much more excellent, and it can be seen that the electromagnetic wave shielding clothing of the present invention is appropriately designed and manufactured by the apparatus for measuring and evaluating electromagnetic wave shielding characteristics in the form of clothing.

As shown in the results of the electromagnetic field distribution analysis by the FDTD method (FIGS. 2 to 6), the results of the short sleeve round neck underwear model of the first embodiment (FIG. 2) and the short sleeve V neck underwear of the second embodiment are shown. From the model results (FIG. 3), the color scheme around the chest is green, yellow, or orange, indicating that the electromagnetic waves are reliably shielded. On the other hand, in the result of the Y-shirt-shaped electromagnetic wave shield clothing model of Comparative Example 1 (FIG. 4) and the result of the best-shaped electromagnetic wave shield clothing model of Comparative Example 2 (FIG. 5), the coloration around the chest is orange or red. , Comparative Example 3
This is almost the same as the result (FIG. 6) of the model in which the electromagnetic wave shielding clothes are not worn, and it can be seen that the electromagnetic wave shielding effect is hardly obtained. This is in good agreement with the measurement result of the clothing shape electromagnetic shielding property.

[0026]

As described above, according to the electromagnetic wave shielding clothing of the present invention, the influence of the electromagnetic wave on the human body due to the high-frequency electromagnetic field radiated from the antenna placed near the human body such as a mobile phone or a wireless device. Can be prevented, and malfunction of a medical device implanted in the body, such as a pacemaker, can be prevented.

[Brief description of the drawings]

FIG. 1 is a measurement system diagram of an apparatus for measuring and evaluating electromagnetic wave shielding characteristics in a clothing shape.

FIG. 2 is a diagram illustrating an analysis result of an electromagnetic field distribution of a short-sleeved round neck underwear model of Example 1.

FIG. 3 is a diagram showing an electromagnetic field distribution analysis result of a short-sleeved V-neck underwear model of Example 2.

FIG. 4 is a diagram showing an electromagnetic field distribution analysis result of a Y-shirt-like clothing model of Comparative Example 1.

FIG. 5 is an electromagnetic field distribution analysis result diagram of a vest-like garment model of Comparative Example 2.

FIG. 6 is an electromagnetic field distribution analysis result diagram of a model in which the electromagnetic wave shielding clothing of Comparative Example 3 is not worn.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic shielding clothing 2 Simulated living body 3 Transmitting antenna 4 Receiving antenna 5 Signal transmitter 6 Signal receiver

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenzo Ishikawa 262 Sou, Miyazu-shi, Kyoto Gunze Co., Ltd. 72) Inventor Toshiyuki Shimizu 262 So, Miyazu-shi, Kyoto Gunze Co., Ltd. Apparel Business Division F-term (reference) 3B011 AA01 AB01 AC25 5E321 AA21 BB41 BB44 GG05

Claims (6)

[Claims] 1. An electromagnetic wave shielding characteristic measurement apparatus for measuring an electromagnetic wave shielding characteristic in a clothes shape capable of measuring an electromagnetic wave shielding characteristic in a state where clothes are worn, so that the clothing shape is adjusted so that a desired electromagnetic wave shielding characteristic is obtained. Electromagnetic shielding clothing that is designed and manufactured. 2. An apparatus for measuring and evaluating electromagnetic wave shielding characteristics in the form of clothing, comprising: a signal transmitter for generating a high-frequency signal; and a transmitting antenna connected to the high-frequency signal transmitter for radiating a high-frequency electromagnetic field to free space. , A simulated living body whose shape and electric constants such as permittivity and magnetic permeability are substantially equal to the actual human body,
It is installed at a predetermined position inside the simulated living body, receives a high-frequency electromagnetic field, has an impedance equivalent to the living body, and has a shape substantially equivalent to a lead wire of an implantable device implanted in an actual human body The electromagnetic wave shielding garment according to claim 1, comprising a receiving antenna having: and a signal receiver connected to the receiving antenna for receiving a high-frequency signal. 3. The electromagnetic wave shielding characteristic of the clothing shape is 15 dB or more when the distance between the transmitting antenna and the simulated living body is 5 cm, 18 dB or more when the distance is 10 cm, and 20 dB when the distance is 20 cm compared to when the clothing is not worn. 3. The shield effect as described above, wherein:
Electromagnetic shielding clothing as described in. 4. The clothing according to claim 1, wherein the clothing has a shape in which no gap is generated when worn.
Electromagnetic shielding clothing as described in. 5. The shape in which no gap is generated at the time of wearing,
The electromagnetic shielding clothing according to claim 4, wherein the clothing is an underwear or a T-shirt. 6. The electromagnetic shielding clothing according to claim 1, wherein malfunction of the cardiac pacemaker is prevented.