JP2012180630A - Electromagnetic wave and sound wave absorbing yarn, electromagnetic wave and sound wave absorbing fabric, electromagnetic wave and sound wave absorbing sheet, electromagnetic wave and sound absorbing plate, and electromagnetic wave and sound wave absorbing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave and sound wave absorbing sheet having both excellent electromagnetic wave absorbing characteristics and sound wave absorbing characteristics, and further having an extremely light weight and thin thickness, and also having translucency by which the opposite side of the sheet can be seen.SOLUTION: An electromagnetic wave and sound wave absorbing fabric having an excellent electromagnetic wave and sound wave absorbing ability is provided by weaving a coarse fabric using an electromagnetic wave and sound wave absorbing yarn, where the yarn is obtained by spinning an organic synthetic resin or rubber or elastomer into which short carbon fibers or carbon powder or short metal wires or metal powder is kneaded. An electromagnetic wave and sound wave absorbing sheet having also translucency is provided by fusing the electromagnetic wave and sound wave absorbing fabric and two transparent thin vinyl sheets together, with the fabric held between the sheets.

Description

  INDUSTRIAL APPLICABILITY The present invention can be used as an excellent electromagnetic wave and sound wave absorber, and has an electromagnetic wave and sound wave absorbing yarn, an electromagnetic wave and sound wave absorbing fabric, an electromagnetic wave and sound wave absorbing sheet, and an electromagnetic wave and sound wave absorbing sheet, as necessary. The present invention relates to a plate and an electromagnetic wave / sound absorbing structure.

  In recent years, with the development of IT (information technology), IT and OA devices such as personal computers (hereinafter referred to as “personal computers”) have rapidly spread, and even in normal home and work environments, The effect of electromagnetic waves radiated from IT equipment / OA equipment on the human body has become a problem. Therefore, in Patent Document 1, for the purpose of applying the above equipment to an electromagnetic wave shielding cabinet or the like, a woven fabric composed of a composite elastic yarn in which metal fibers are spirally wound around an elastic fiber is thermoplastically synthesized. An idea of a synthetic resin plate for electromagnetic wave shielding sandwiched between resin sheets is disclosed.

  In Patent Document 2, in order to shield electromagnetic waves in a wider range, a blended yarn of an aluminum fiber obtained by finely cutting an aluminum foil into staple fibers and a normal spinnable fiber is used. The present invention discloses an idea of a curtain for electromagnetic wave shielding formed by a woven fabric woven using a woven fabric.

  Furthermore, in the invention described in Patent Document 3, in order to sew electromagnetic shielding work clothes and the like for the purpose of more reliably protecting the human body from electromagnetic waves, the conductive metal wire and the twisted yarn or filament yarn are drawn in parallel. A core yarn is formed in a uniform manner, and a twisted yarn or a filament yarn is Z-twisted and S-twisted around the core yarn to prevent the conductive metal wire from being exposed, thereby forming a composite yarn for electromagnetic wave shielding and weaving.

  On the other hand, prevention of noise pollution to private houses along highways and railway lines is also an important issue. For this reason, various soundproof structures, sound absorbing structures, soundproof walls, and the like have been developed.

  For example, in Patent Document 4, in a porous soundproof structure configured by disposing an exterior plate and an interior plate having a large number of through holes so as to face each other, the interior plate has a top located on the exterior plate side. The patent invention of the porous soundproof structure in which the convex part is formed and the top part of the convex part is joined to the exterior board via the damping member which attenuates vibration is disclosed. Thus, it is said that sufficient soundproof performance is exhibited not only for the resonance frequency in the general formula of the Helmholtz resonance principle but also for noise in a wide frequency band.

  In Patent Document 5, a transparent plate is provided with a large number of pores to form a porous plate, and the surface impedance of the porous plate with respect to a frequency intended for sound absorption is a product of the density of air and the speed of sound. The invention of a sound-absorbing structure in which the aperture ratio of pores to the surface of a porous plate is determined so as to approach a fixed impedance is disclosed. Thus, it is possible to obtain a sound-absorbing material that can have sufficient transparency and is excellent in terms of rigidity and the like.

  Further, in Patent Document 6, a translucent sound absorbing material in which a perforated plate having an aperture ratio of 40% or more is provided by providing openings having a hole diameter of 3 to 50 mm on both sides or one side of a translucent film-like material; A patented invention of a translucent soundproof board comprising a translucent soundproof board and a panel frame member that holds these at regular intervals is disclosed. As a result, the light-transmitting soundproof plate has light-transmitting properties and see-through properties, and also has sound-absorbing properties and sound-insulating properties.

  Further, Patent Document 7 discloses an invention of a radio wave acoustic wave absorber formed by laminating a radio wave reflector, a sound absorbing unit, a radio wave absorbing unit, and a plate-shaped radio wave absorber protecting unit made of a dielectric. By using the radio wave absorber having such a configuration, it has a function of absorbing radio waves and sound waves coming from the radio wave absorber protection part side, and can be used in the field, which was difficult with conventional radio wave absorbers. It can be installed on roads.

No. 3-40595 No. 3-36538 JP 2004-11033 A Japanese Patent No. 3661779 JP 2003-41528 A Japanese Patent No. 3625392 JP 2004-3259 A

  However, in the synthetic resin plate for electromagnetic wave shielding described in Patent Document 1, a woven fabric composed of metal fibers is sandwiched between thermoplastic synthetic resin sheets, and the metal material is not exposed on the surface. . As a result, the electromagnetic wave shielding performance is not as large as 57 dB at a frequency of 30 MHz and 42 dB at 1000 MHz (1 GHz). Further, in the curtain for electromagnetic wave shielding described in Patent Document 2, since the surface exposure ratio of the aluminum fiber is small, the electromagnetic wave shielding performance remains at 30 to 50 dB with respect to the electromagnetic wave having a frequency of 10 to 500 MHz.

  Further, in the composite yarn for electromagnetic wave shielding and knitting described in Patent Document 3, since the metal wire is not exposed because importance is placed on the comfort, no specific measurement data is described. However, the electromagnetic shielding performance is considered to be even smaller.

  Furthermore, although the electromagnetic wave shielding performance to some extent is obtained in the devices or inventions described in Patent Documents 1 to 3, the soundproofing effect and the sound absorbing effect are hardly provided. On the other hand, in the inventions described in Patent Documents 4 to 6, the soundproofing effect and sound absorbing effect are excellent, but the electromagnetic wave shielding performance is not at all. Thus, the devices or inventions described in Patent Documents 1 to 6 do not have both electromagnetic wave absorption characteristics and sound wave absorption characteristics.

  On the other hand, Patent Document 7 describes an invention of a radio wave absorber having both radio wave absorption characteristics and sound wave absorption characteristics. However, a metal plate is used as the radio wave reflector constituting the radio wave absorber, the sound absorbing part includes a sound absorbing material made of glass wool or synthetic fiber, and the radio wave absorbing part is made of a conductive foam having open cells. Therefore, the radio wave absorber is heavy and thick as a whole, and it is not easy to mount it on the inner wall of the tunnel, and a lighter and thinner radio wave absorber has been desired.

  In addition, since the radio wave absorber having such a configuration blocks the light beam and the other side is not visible, when used as a road accessory, it obstructs the view of the driver and passengers of a vehicle such as an automobile and feels obstruction. give. Furthermore, in an ETC (Electronic Toll Collection) system provided at a toll booth on an expressway, etc., when used for electromagnetically blocking between the gates of adjacent ETC systems, the passing situation of vehicles at adjacent gates There was a problem that could not be seen.

  Therefore, the present invention combines an excellent electromagnetic wave absorption property and a sound wave absorption property, and is also extremely light and thin, and has an electromagnetic wave / sonic wave absorption sheet and an electromagnetic wave / sonic wave absorption plate having translucency so that the other side can be seen if necessary, An object of the present invention is to provide an electromagnetic wave / sound absorbing structure, an electromagnetic wave / sound absorbing yarn for manufacturing them, an electromagnetic wave / sound absorbing fabric, and an electromagnetic wave shielding yarn capable of shielding electromagnetic waves with a similar structure.

  The electromagnetic wave / acoustic absorption yarn according to the invention of claim 1 is an electromagnetic wave / acoustic absorption yarn obtained by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. Thus, the fluororesin is coated over the entire length of the electromagnetic wave / sound absorbing yarn.

  Here, examples of the “organic synthetic resin” include thermoplastic resins such as polyethylene, polypropylene, acrylic resin, and vinyl chloride resin, and thermosetting resins such as phenol resin and epoxy resin. “Elastomer” in the broad sense means “highly elastic polymer” and includes natural rubber and synthetic rubber (edited by Saburo Nagakura et al., “Iwanami Rikagaku Dictionary, 5th Edition”, page 153, published.・ Iwanami Shoten Co., Ltd., issue date, February 20, 1998), here, it means a narrowly defined elastomer that does not contain rubber.

  In addition, as a method of coating the fluororesin, there are a method of spraying a liquid fluororesin, a method of immersing in a fluororesin solution, a method of baking a gaseous fluororesin, and the like.

  The electromagnetic wave / acoustic absorption fabric according to the invention of claim 2 is formed by weaving the electromagnetic wave / acoustic absorption yarn according to claim 1 or by mixing the electromagnetic wave / acoustic absorption yarn and normal spinnable fiber. Weaving.

  The electromagnetic wave / acoustic absorption fabric according to the invention of claim 3 is made by weaving an electromagnetic wave / acoustic absorption yarn formed by kneading a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. Electromagnetic wave / sound absorbing fabric made by coating a fluororesin over the entire surface of the electromagnetic wave / sound absorbing fabric made by mixing and weaving the above electromagnetic wave / sound absorbing yarn and ordinary spinning fiber It is.

  The electromagnetic wave / sound absorbing sheet according to the invention of claim 4 is formed by weaving an electromagnetic wave / sound absorbing yarn formed by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. Electromagnetic wave / sound absorbing fabric, or two thin organic layers of two or more layers of electromagnetic wave / sound absorbing fabrics formed by mixing and weaving the above electromagnetic wave / sound absorbing yarn and ordinary spinning fiber. It is a thin and highly flexible sheet that is sandwiched between a synthetic resin sheet, rubber sheet, or elastomer sheet and heat-pressed.

  The electromagnetic wave / acoustic wave absorbing sheet according to the invention of claim 5 is made by weaving an electromagnetic wave / acoustic wave absorbing yarn obtained by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. In the electromagnetic wave / acoustic absorption fabric, or the electromagnetic wave / acoustic absorption fabric formed by mixing and weaving the electromagnetic wave / acoustic absorption yarn and the usual spinnable fibers, Two or more different materials are stacked and sandwiched between two thin organic synthetic resin sheets, rubber sheets, or elastomer sheets, and heat-pressed to form a thin and highly flexible sheet.

  The electromagnetic wave / sound absorbing sheet according to the invention of claim 6 is made by weaving an electromagnetic wave / sound absorbing yarn formed by kneading a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. 1 or 2 or more layers of the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing fabric formed by mixing the electromagnetic wave / sound absorbing yarn and the usual spinnable fiber, and the entire surface has a pore diameter. Thin and flexible by sandwiching and bonding between two thin organic synthetic resin sheets or rubber sheets or elastomer sheets in which a large number of through holes in the range of 100 nm to 1 mm are perforated within a range of 5% to 30%. It becomes a highly sheet-like sheet.

  The electromagnetic wave / acoustic wave absorbing plate according to the invention of claim 7 has a predetermined thickness between the electromagnetic wave / acoustic wave absorbing fabrics of the electromagnetic wave / acoustic wave absorbing fabric according to claim 2 or 3 having different textures. Two or more organic synthetic resin plates, rubber plates or elastomer plates are sandwiched and bonded or thermocompression bonded to form a thick and low flexibility plate.

  The electromagnetic wave / acoustic wave absorbing plate according to the invention of claim 8 is formed by weaving an electromagnetic wave / acoustic wave absorbing yarn formed by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. The electromagnetic wave / sound absorbing fabrics, or the electromagnetic wave / sound absorbing fabrics of the electromagnetic wave / sound absorbing yarns mixed and woven by mixing the above-mentioned electromagnetic wave / sound absorbing yarns and ordinary spinnable fibers have different textures of the electromagnetic waves / sound absorbing yarns. Two or more sheets of organic synthetic resin plates or rubber plates or elastomer plates having a predetermined thickness are sandwiched between them and bonded or heat-pressed to form a thick and low flexibility plate.

  The electromagnetic wave / acoustic wave absorbing sheet or electromagnetic wave / acoustic wave absorbing plate according to the invention of claim 9 is characterized in that the electromagnetic wave / acoustic wave absorbing fabric has a coarse texture of 1 mm to 200 mm, and the two thin organic synthetic resin sheets or rubber sheets or elastomers The sheet or the organic synthetic resin plate or the rubber plate or the elastomer plate having the predetermined thickness is transparent.

  An electromagnetic wave / sound absorbing structure according to the invention of claim 10 is a dielectric between two sheets formed by stretching the electromagnetic wave / sound absorbing yarn according to claim 1 in parallel to each other at a predetermined interval from a frame. The electromagnetic wave / sound absorbing yarn stretched across each other with a sheet sandwiched between them is vertically stacked, or the electromagnetic wave / sound absorbing yarn according to claim 1 is stretched vertically and horizontally on a frame. .

  The electromagnetic wave / acoustic absorption structure according to the invention of claim 11 is an electromagnetic wave / acoustic absorption yarn obtained by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. The electromagnetic wave / acoustic absorption yarns that are stretched over each other with a dielectric sheet sandwiched between two sheets that are stretched in parallel with each other at a predetermined interval on the frame body, An electromagnetic wave / sound absorbing yarn is stretched vertically and horizontally on a frame.

  The electromagnetic wave / sound absorption structure according to the invention of claim 12 is the electromagnetic wave / sound absorption structure according to claim 2 or 3, or the electromagnetic wave / sound absorption structure according to claim 10 or 11. On the other hand, the metal nets are opposed to each other with a predetermined interval, and both are fixed to the frame.

  The electromagnetic wave / sound absorption structure according to the invention of claim 13 is a structure in which a thin metal plate or a metal net is fixed to a wall surface to be installed, and a metal channel material having a predetermined channel interval is used. The electromagnetic wave / sound absorbing fabric according to item 3 or the electromagnetic wave / sound absorbing structure according to claim 10 or 11 is attached.

  An electromagnetic wave / sound absorption structure according to the invention of claim 14 is formed by winding the electromagnetic wave / sound absorption yarn of claim 1 around the outer peripheral surface of a plastic pipe having a predetermined inner diameter in the Z direction and the S direction at a predetermined pitch. And a metal rod or metal pipe is supported inside the plastic pipe by caps fixed to both ends of the plastic pipe along the center line of the plastic pipe. .

  The electromagnetic wave / sound absorbing structure according to the invention of claim 15 is formed by arranging a plurality of the electromagnetic wave / sound absorbing structures according to claim 14 in parallel at a predetermined interval.

  The electromagnetic wave / acoustic absorption yarn according to the invention of claim 1 is an electromagnetic wave / acoustic absorption yarn obtained by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. Thus, the fluororesin is coated over the entire length of the electromagnetic wave / sound absorbing yarn.

  Here, examples of the “organic synthetic resin” include thermoplastic resins such as polyethylene, polypropylene, acrylic resin, and vinyl chloride resin, and thermosetting resins such as phenol resin and epoxy resin. The term “elastomer” refers to a “highly elastic polymer substance” in a broad sense, and includes natural rubber and synthetic rubber, but here, it means a narrowly defined elastomer that does not contain rubber.

  Thus, short carbon fiber, carbon powder, short metal wire, or organic synthetic resin fiber or rubber fiber or elastomer fiber kneaded with metal powder is short carbon fiber, carbon powder, short metal wire having conductivity inside, Or, since it contains metal powder, it exhibits excellent electromagnetic wave absorption characteristics, and depending on the method of use, it also exhibits excellent sound wave absorption characteristics. And since it is an organic synthetic resin fiber, a rubber fiber, or an elastomer fiber, a woven fabric can be woven by a normal method.

  The electromagnetic wave / sound absorbing yarn having such a configuration is excellent in water resistance because it is coated with a fluororesin having water repellency over the entire length, and the electromagnetic wave / sound absorbing fabric formed by weaving the electromagnetic wave / sound absorbing yarn is sealed. Even without it, it can be used outdoors as it is.

  In this way, it becomes an electromagnetic wave / sound absorbing yarn that has a large electromagnetic wave / sound absorbing performance and is excellent in water resistance and can be woven with a loom just like a normal spinable fiber.

  The electromagnetic wave / acoustic absorption fabric according to the invention of claim 2 is formed by weaving the electromagnetic wave / acoustic absorption yarn according to claim 1 or by mixing the electromagnetic wave / acoustic absorption yarn and normal spinnable fiber. Weaving.

  As described above, since the electromagnetic wave / acoustic wave absorbing yarn according to claim 1 includes short carbon fiber, carbon powder, short metal wire, or metal powder having conductivity therein, the short metal wire or short carbon fiber is included. In addition to being able to strongly absorb electromagnetic waves having a frequency corresponding to the length of the material, it also has a function of dispersing sound waves by dispersing air, thus functioning as a sound wave absorbing yarn.

  In addition, even when the electromagnetic wave / sound absorbing yarn according to claim 1 and a normal spinnable fiber are mixed and woven, the large electromagnetic wave / sound absorbing performance is not deteriorated, and it is used for an indoor curtain or the like. For example, it is possible to produce a light-shielding effect at a lower cost by mixing and weaving ordinary spinnable fibers.

  Thus, the electromagnetic wave / sound absorbing yarn according to claim 1 is woven, or the electromagnetic wave / sound absorbing yarn according to claim 1 is mixed with a normal spinnable fiber. By doing so, it becomes an electromagnetic wave / sound absorbing fabric that has higher electromagnetic wave / sound absorption performance and is excellent in water resistance and can be woven with a loom just like a normal fabric.

  Furthermore, as a result of earnest experimental research, the present inventor has found that the peak of the wavelength (that is, frequency) of the electromagnetic wave that can be absorbed changes according to the size of the electromagnetic wave / sound absorbing yarn weave in the electromagnetic wave / sound absorbing fabric. I found it. Therefore, by setting the size of the weave of the electromagnetic wave / acoustic absorption yarn in the electromagnetic wave / acoustic absorption fabric according to the wavelength (frequency) of the electromagnetic wave to be absorbed, the electromagnetic wave having the desired wavelength (frequency) can be obtained even by one sheet. An electromagnetic wave / sound absorption fabric that can be strongly absorbed can be obtained.

  In this way, the electromagnetic wave / sound absorbing yarn according to claim 1 is woven to a size of a weave matching the wavelength of the target electromagnetic wave, or the electromagnetic wave / sound absorbing yarn according to claim 1 And ordinary spinnable fibers are mixed and weaved to the size of the weave that matches the wavelength of the target electromagnetic wave. It becomes an electromagnetic wave / sound absorption fabric that can be woven with a loom just like a fabric.

  The electromagnetic wave / acoustic absorption fabric according to the invention of claim 3 is made by weaving an electromagnetic wave / acoustic absorption yarn formed by kneading a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. Electromagnetic wave / sound absorbing fabric made by coating a fluororesin over the entire surface of the electromagnetic wave / sound absorbing fabric made by mixing and weaving the above electromagnetic wave / sound absorbing yarn and ordinary spinning fiber It is.

  An electromagnetic wave / acoustic absorption fabric formed by weaving an organic synthetic resin, rubber, or elastomer into a short carbon fiber, carbon powder, or a short metal wire or metal powder, and spinning the electromagnetic wave / acoustic absorption yarn, or the electromagnetic wave / acoustic wave An electromagnetic wave / sound absorbing fabric woven by mixing absorbent yarn and ordinary spinnable fiber has no water resistance. Therefore, the fluororesin is coated over the entire front and back surfaces of the electromagnetic wave / sound absorbing fabric to provide water resistance so that it can be used outdoors.

  In this way, by forming a short carbon fiber, carbon powder, a short metal wire, or a metal powder containing conductive metal inside, and coating it with a fluororesin and woven electromagnetic waves / acoustic absorption yarns, larger electromagnetic waves / It is an electromagnetic wave / sound absorbing fabric that has a sound absorbing property and is excellent in water resistance and can be woven with a loom just like ordinary spinnable fibers.

  The electromagnetic wave / sound absorbing sheet according to the invention of claim 4 is formed by weaving an electromagnetic wave / sound absorbing yarn formed by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. Electromagnetic wave / sound absorbing fabric, or two thin organic layers of two or more layers of electromagnetic wave / sound absorbing fabrics formed by mixing and weaving the above electromagnetic wave / sound absorbing yarn and ordinary spinning fiber. It is a thin and highly flexible sheet that is sandwiched between a synthetic resin sheet, rubber sheet, or elastomer sheet and heat-pressed.

  As a result, the electromagnetic wave / sound absorbing sheet without water resistance is prevented from getting wet with moisture such as rain, and the electromagnetic wave / sound absorbing sheet can be used outdoors. In addition, when sandwiching between two thin organic synthetic resin sheets or rubber sheets or elastomer sheets and thermocompression bonding, in the part where there is an electromagnetic wave / acoustic absorption yarn below, the thin organic synthetic resin sheet or Since the rubber sheet or elastomer sheet does not adhere, minute holes are formed in the thin organic synthetic resin sheet, rubber sheet, or elastomer sheet to form air passages, and these minute holes form the entire surface of the electromagnetic wave / sound absorbing sheet. Therefore, the electromagnetic wave / sound absorption performance is not impaired.

  In this way, the electromagnetic wave / sound absorbing sheet can be installed in any place and has excellent electromagnetic wave / sound absorbing performance.

  The electromagnetic wave / acoustic wave absorbing sheet according to the invention of claim 5 is made by weaving an electromagnetic wave / acoustic wave absorbing yarn obtained by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. In the electromagnetic wave / acoustic absorption fabric, or the electromagnetic wave / acoustic absorption fabric formed by mixing and weaving the electromagnetic wave / acoustic absorption yarn and the usual spinnable fibers, Two or more different materials are stacked and sandwiched between two thin organic synthetic resin sheets, rubber sheets, or elastomer sheets, and heat-pressed to form a thin and highly flexible sheet.

  When the texture of the electromagnetic wave / sound absorbing fabric is different, the frequency band showing the greatest electromagnetic wave absorption is different. Therefore, by stacking two or more such electromagnetic wave / sound absorbing fabrics, an electromagnetic wave / sound absorbing sheet having excellent electromagnetic wave absorbing performance over a wider frequency band is obtained.

  And it becomes an electromagnetic wave and a sound wave absorption sheet which can use an electromagnetic wave and a sound wave absorption textiles without water resistance by getting wet with moisture, such as rain, and can be used outdoors. In addition, when sandwiching between two thin organic synthetic resin sheets or rubber sheets or elastomer sheets and thermocompression bonding, in the part where there is an electromagnetic wave / acoustic absorption yarn below, the thin organic synthetic resin sheet or Since the rubber sheet or elastomer sheet does not adhere, minute holes are formed in the thin organic synthetic resin sheet, and air passages are formed, and many such minute holes are formed on the entire surface of the electromagnetic wave / sound absorbing sheet. The electromagnetic wave / sound absorption performance is not impaired.

  In this way, the electromagnetic wave / sound absorbing sheet has excellent electromagnetic wave absorption performance over a wider frequency band and can be installed in any place, and has excellent electromagnetic wave / sound absorption performance.

  The electromagnetic wave / sound absorbing sheet according to the invention of claim 6 is made by weaving an electromagnetic wave / sound absorbing yarn formed by kneading a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. 1 or 2 or more layers of the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing fabric formed by mixing the electromagnetic wave / sound absorbing yarn and the usual spinnable fiber, and the entire surface has a pore diameter. Thin and flexible by sandwiching and bonding between two thin organic synthetic resin sheets or rubber sheets or elastomer sheets in which a large number of through holes in the range of 100 nm to 1 mm are perforated within a range of 5% to 30%. It becomes a highly sheet-like sheet.

  If the hole diameter is a through-hole in the range of 100 nm to 1 mm, air passes but moisture does not pass through, so the water-resistant electromagnetic wave and sound-absorbing fabric can absorb moisture such as rain without impairing sound absorption characteristics. It becomes an electromagnetic wave and sound wave absorbing sheet that can be used outdoors by preventing getting wet. If the opening ratio is in the range of 5% to 30%, the two thin organic synthetic resin sheets or rubber sheets or elastomer sheets are not torn, and the organic synthetic resin sheet or rubber is bonded by bonding instead of thermocompression bonding. It is also possible to prevent large holes from opening in the sheet or elastomer sheet.

  In this way, the electromagnetic wave / sound absorbing sheet can be installed in any place and has excellent electromagnetic wave / sound absorbing performance.

  The electromagnetic wave / acoustic wave absorbing plate according to the invention of claim 7 has a predetermined thickness between the electromagnetic wave / acoustic wave absorbing fabrics of the electromagnetic wave / acoustic wave absorbing fabric according to claim 2 or 3 having different textures. Two or more organic synthetic resin plates, rubber plates or elastomer plates are sandwiched and bonded or thermocompression bonded to form a thick and low flexibility plate.

  In this way, by overlapping the electromagnetic wave / acoustic wave absorbing fabrics having different textures with an organic synthetic resin plate, rubber plate or elastomer plate having a predetermined thickness in between, the wavelength peaks of electromagnetic waves to be absorbed are different. The electromagnetic wave / sound absorbing fabric can be arranged at a predetermined interval, and has a strong electromagnetic wave absorbing performance.

  That is, when the texture of the electromagnetic wave / sound absorbing fabric is different, the frequency band showing the largest electromagnetic wave absorption is different. Therefore, by stacking two or more such electromagnetic wave / sound absorbing fabrics, an electromagnetic wave / sound absorbing plate having excellent electromagnetic wave absorbing performance over a wider frequency band is obtained.

  The inventor has found that the electromagnetic wave / sound absorbing fabric is provided with a predetermined interval to provide a superior electromagnetic wave / sound absorbing performance, and the present invention is completed based on this finding. It is a thing. That is, by sandwiching an organic synthetic resin plate or rubber plate or elastomer plate with a predetermined thickness according to the dielectric constant between them, it is possible to install such electromagnetic wave / sound absorbing fabrics separated by a predetermined interval, which is more excellent. The electromagnetic wave / sound absorbing plate has the electromagnetic wave / sound absorbing performance.

  In this way, the electromagnetic wave / sound absorbing plate has excellent electromagnetic wave absorbing performance over a wider frequency band, and more excellent electromagnetic wave / sound absorbing performance.

  The electromagnetic wave / acoustic wave absorbing plate according to the invention of claim 8 is formed by weaving an electromagnetic wave / acoustic wave absorbing yarn formed by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. The electromagnetic wave / sound absorbing fabrics, or the electromagnetic wave / sound absorbing fabrics of the electromagnetic wave / sound absorbing yarns mixed and woven by mixing the above-mentioned electromagnetic wave / sound absorbing yarns and ordinary spinnable fibers have different textures of the electromagnetic waves / sound absorbing yarns. Two or more sheets of organic synthetic resin plates or rubber plates or elastomer plates having a predetermined thickness are sandwiched between them and bonded or heat-pressed to form a thick and low flexibility plate.

  In this way, by overlapping the electromagnetic wave / acoustic wave absorbing fabrics having different textures with an organic synthetic resin plate, rubber plate or elastomer plate having a predetermined thickness in between, the wavelength peaks of electromagnetic waves to be absorbed are different. The electromagnetic wave / sound absorbing fabric can be arranged at a predetermined interval, and has a strong electromagnetic wave absorbing performance.

  That is, when the texture of the electromagnetic wave / sound absorbing fabric is different, the frequency band showing the largest electromagnetic wave absorption is different. Therefore, by stacking two or more such electromagnetic wave / sound absorbing fabrics, an electromagnetic wave / sound absorbing plate having excellent electromagnetic wave absorbing performance over a wider frequency band is obtained.

  The inventor has found that the electromagnetic wave / sound absorbing fabric is provided with a predetermined interval to provide a superior electromagnetic wave / sound absorbing performance, and the present invention is completed based on this finding. It is a thing. That is, by sandwiching an organic synthetic resin plate or rubber plate or elastomer plate with a predetermined thickness according to the dielectric constant between them, it is possible to install such electromagnetic wave / sound absorbing fabrics separated by a predetermined interval, which is more excellent. The electromagnetic wave / sound absorbing plate has the electromagnetic wave / sound absorbing performance.

  In this way, the electromagnetic wave / sound absorbing plate has excellent electromagnetic wave absorbing performance over a wider frequency band, and more excellent electromagnetic wave / sound absorbing performance.

  The electromagnetic wave / acoustic wave absorbing sheet or electromagnetic wave / acoustic wave absorbing plate according to the invention of claim 9 is characterized in that the electromagnetic wave / acoustic wave absorbing fabric has a coarse texture of 1 mm to 200 mm, and the two thin organic synthetic resin sheets or rubber sheets or elastomers The sheet or the organic synthetic resin plate or the rubber plate or the elastomer plate having the predetermined thickness is transparent.

  As described above, the electromagnetic wave / sound absorbing fabric has a coarse texture of 1 mm to 200 mm and the organic synthetic resin sheet, rubber sheet, elastomer sheet, organic synthetic resin plate, rubber plate, or elastomer plate is transparent. The sound absorbing sheet or electromagnetic wave / sound absorbing plate has translucency so that the other side can be seen. Therefore, it is extremely suitable for applications requiring translucency.

  In this way, an electromagnetic wave / sound absorbing sheet or an electromagnetic wave / sound absorbing plate having excellent electromagnetic wave absorbing performance, excellent sound wave absorbing performance, translucency, and the other side can be seen.

  An electromagnetic wave / sound absorbing structure according to the invention of claim 10 is a dielectric between two sheets formed by stretching the electromagnetic wave / sound absorbing yarn according to claim 1 in parallel to each other at a predetermined interval from a frame. The electromagnetic wave / sound absorbing yarn stretched across each other with a sheet sandwiched between them is vertically stacked, or the electromagnetic wave / sound absorbing yarn according to claim 1 is stretched vertically and horizontally on a frame. .

  As a result, even without weaving the fabric with a loom, the electromagnetic wave and sound wave absorption having excellent electromagnetic wave and sound wave absorption performance can be achieved by stretching it at a predetermined interval according to the wavelength of the electromagnetic wave to be absorbed. It becomes a structure. Since only the electromagnetic wave / sound absorbing yarn is stretched at a predetermined interval, the electromagnetic wave / sound absorbing structure is excellent in translucency and the other side can be seen well. In addition, the electromagnetic wave / sound absorbing yarn of claim 1 is stretched over the frame, and the electromagnetic wave / sound absorbing structure is excellent in water resistance, so that it is suitable for outdoor use.

  In this way, an electromagnetic wave / sound absorption structure having a simple structure and excellent electromagnetic wave absorption performance, having excellent sound wave absorption performance, and having translucency and the other side visible.

  The electromagnetic wave / acoustic absorption structure according to the invention of claim 11 is an electromagnetic wave / acoustic absorption yarn obtained by kneading and spinning a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer. The electromagnetic wave / acoustic absorption yarns that are stretched over each other with a dielectric sheet sandwiched between two sheets that are stretched in parallel with each other at a predetermined interval on the frame body, An electromagnetic wave / sound absorbing yarn is stretched vertically and horizontally on a frame.

  As a result, even without weaving the fabric with a loom, the electromagnetic wave and sound wave absorption having excellent electromagnetic wave and sound wave absorption performance can be achieved by stretching it at a predetermined interval according to the wavelength of the electromagnetic wave to be absorbed. It becomes a structure. Since only the electromagnetic wave / sound absorbing yarn is stretched at a predetermined interval, the electromagnetic wave / sound absorbing structure is excellent in translucency and the other side can be seen well.

  In this way, an electromagnetic wave / sound absorption structure having a simple structure and excellent electromagnetic wave absorption performance, having excellent sound wave absorption performance, and having translucency and the other side visible.

  The electromagnetic wave / sound absorption structure according to the invention of claim 12 is the electromagnetic wave / sound absorption structure according to claim 2 or 3, or the electromagnetic wave / sound absorption structure according to claim 10 or 11. On the other hand, the metal nets are opposed to each other with a predetermined interval, and both are fixed to the frame.

  As a result, the electromagnetic wave incident from the electromagnetic wave / sound absorbing fabric side or the electromagnetic wave / sound absorbing structure side is first partially absorbed by the electromagnetic wave / sound absorbing fabric or electromagnetic wave / sound absorbing structure and reflected by a metal net. And absorbed again when passing through the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure. Here, the distance between the metal net and the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure is a predetermined interval that matches the wavelength of the electromagnetic wave to be absorbed. The electromagnetic waves reflected by the net cancel each other and can absorb the electromagnetic waves more effectively.

  The electromagnetic wave / sound absorbing structure formed by fixing the metal net and the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure to the frame allows air to freely pass therethrough. Excellent sound absorbing characteristics are exhibited by the absorbent fabric or electromagnetic wave / sound absorbing structure. In addition, the electromagnetic wave / sound absorbing structure according to the present invention has translucency so that the other side can be seen. Furthermore, since the electromagnetic wave / sound absorbing fabric according to claim 2 or 3 has water resistance, it is suitable for outdoor use for shielding radio waves between ETC systems.

  In this way, an electromagnetic wave / sound absorbing structure that has excellent electromagnetic wave absorbing performance, has excellent sound wave absorbing performance, has translucency, can be seen from the other side, and is lightweight.

  The electromagnetic wave / sound absorption structure according to the invention of claim 13 is a structure in which a thin metal plate or a metal net is fixed to a wall surface to be installed, and a metal channel material having a predetermined channel interval is used. The electromagnetic wave / sound absorbing fabric according to item 3 or the electromagnetic wave / sound absorbing structure according to claim 10 or 11 is attached.

  As a result, the electromagnetic wave incident from the electromagnetic wave / sound absorbing fabric side or the electromagnetic wave / sound absorbing structure side is first partially absorbed by the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure, and is made of a thin metal plate or metal Reflected by the net and absorbed again when passing through the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure. Here, the distance between the thin metal plate or the metal net and the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure is a predetermined distance according to the wavelength of the electromagnetic wave to be absorbed by the metal channel material. Therefore, the incident electromagnetic wave and the electromagnetic wave reflected by the thin metal plate or metal net cancel each other, and the electromagnetic wave can be absorbed more effectively.

  There is a predetermined gap between the thin metal plate or metal net fixed to the wall and the electromagnetic wave / sound absorbing fabric or electromagnetic wave / sound absorbing structure so that air can freely pass therethrough. Therefore, an excellent sound absorption characteristic is exhibited by the electromagnetic wave / sound absorbing fabric or the electromagnetic wave / sound absorbing structure. Furthermore, since the electromagnetic wave / sound absorbing fabric according to claim 2 or 3 has water resistance, it is suitable for outdoor use such as a tunnel inner wall.

  An electromagnetic wave / sound absorption structure according to the invention of claim 14 is formed by winding the electromagnetic wave / sound absorption yarn of claim 1 around the outer peripheral surface of a plastic pipe having a predetermined inner diameter in the Z direction and the S direction at a predetermined pitch. And a metal rod or metal pipe is supported inside the plastic pipe by caps fixed to both ends of the plastic pipe along the center line of the plastic pipe. .

  The electromagnetic wave incident on the electromagnetic wave / sound absorbing structure having such a structure is first partially absorbed by the electromagnetic wave / sound absorbing thread on the outer peripheral surface of the plastic pipe and reflected by a metal rod or pipe inside the plastic pipe. Then, it is absorbed again by the electromagnetic wave / sound absorbing yarn on the outer peripheral surface. Accordingly, electromagnetic waves incident from any direction with respect to the electromagnetic wave / sound absorbing structure can be strongly absorbed. And since a sound wave is absorbed by the electromagnetic wave and sound wave absorption thread | yarn of the outer peripheral surface of a plastic pipe, the outstanding electromagnetic wave and sound wave absorption performance are shown.

  Let's absorb the predetermined inner diameter of the plastic pipe (more precisely, the distance from the inner metal rod or pipe surface to the electromagnetic wave / acoustic absorption yarn on the outer surface) and the predetermined pitch around which the electromagnetic wave / acoustic absorption yarn is wound. By setting according to the wavelength of the electromagnetic wave, it is possible to efficiently absorb the electromagnetic wave of the target wavelength. Further, if a transparent pipe is used as the plastic pipe, an electromagnetic wave / sound absorbing structure having translucency can be obtained.

  In this way, an electromagnetic wave / sound absorbing structure having excellent electromagnetic wave / sound absorbing performance and capable of particularly strongly absorbing an electromagnetic wave with a predetermined wavelength is obtained.

  The electromagnetic wave / sound absorbing structure according to the invention of claim 15 is formed by arranging a plurality of the electromagnetic wave / sound absorbing structures according to claim 14 in parallel at a predetermined interval.

  As a result, electromagnetic waves / sound waves can be absorbed over a wide area, and a stronger electromagnetic wave absorbing ability can be exhibited by corresponding to the wavelength of the electromagnetic waves to be absorbed at a predetermined interval. In addition, since the electromagnetic wave / sound absorption structure according to claim 14 is arranged at a predetermined interval, the other side can be seen even when a transparent plastic pipe is not used. .

  In this way, an electromagnetic wave / sound absorbing structure having excellent electromagnetic wave / sound absorbing performance and capable of particularly strongly absorbing an electromagnetic wave with a predetermined wavelength is obtained.

FIG. 1 is an explanatory view showing a process of manufacturing an electromagnetic wave / sound absorbing yarn according to Embodiment 1 of the present invention. FIG. 2 (a) is a partially enlarged view showing the structure of the electromagnetic wave / sound absorbing yarn according to the first embodiment of the present invention, and FIG. 2 (b) shows the structure of the electromagnetic wave / sound absorbing fabric according to the first embodiment of the present invention. It is a perspective view. FIG. 3 is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing fabric according to the first embodiment of the present invention. FIG. 4A is a perspective view showing a method of manufacturing the electromagnetic wave / sound absorbing sheet according to the first embodiment of the present invention, and FIG. 4B shows the structure of the electromagnetic wave / sound absorbing sheet according to the first embodiment of the present invention. It is a perspective view. FIG. 5A is a cross-sectional view showing the structure of an electromagnetic wave / acoustic wave absorbing plate according to Embodiment 2 of the present invention, and FIG. 5B is a perspective view showing the entire structure. FIG. 6 is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing plate according to the second embodiment of the present invention. 7A is a perspective view showing a construction state of the electromagnetic wave / sound absorbing sheet according to the third embodiment of the present invention on the inner wall of the tunnel, and FIG. 7B is an electromagnetic wave / sound absorbing effect in the tunnel of the electromagnetic wave / sound absorbing sheet. It is explanatory drawing which shows. FIG. 8 is a perspective view showing an example of use of the electromagnetic wave / sound absorbing plate according to the third embodiment of the present invention at a toll gate on an expressway. FIG. 9A is an enlarged view showing a method for producing an electromagnetic wave / acoustic absorption yarn for forming an electromagnetic wave / acoustic absorption structure according to Embodiment 4 of the present invention, and FIG. It is an enlarged view which shows a state. FIG. 10A is a perspective view showing a method for manufacturing an electromagnetic wave / sound absorbing structure according to Embodiment 4 of the present invention, and FIG. 10B is a perspective view showing a completed state of the electromagnetic wave / sound absorbing structure. FIG. 11A is a perspective view showing a method for manufacturing an electromagnetic wave / sound absorbing structure according to a first modification of Embodiment 4 of the present invention, and FIG. 11B is an electromagnetic wave / sound absorbing structure according to the first modification. It is a perspective view which shows the completion state of. FIG. 12A is a perspective view showing a method for manufacturing an electromagnetic wave / sound absorbing structure according to a second modification of Embodiment 4 of the present invention, and FIG. 12B is an electromagnetic wave / sound absorbing structure according to the second modification. It is a perspective view which shows the completion state of. FIG. 13: is a perspective view which shows the usage example in the toll booth of the electromagnetic wave and sound wave absorption structure concerning Embodiment 4 of this invention and the 2nd modification of Embodiment 4 of this invention. FIG. 14A is a perspective view showing the structure of an electromagnetic wave / sound absorbing structure according to a fifth embodiment of the present invention, and FIG. 14B is a perspective view showing an example of use of the electromagnetic wave / sound absorbing structure at a toll gate on a highway. FIG. FIG. 15A is a perspective view showing the structure of the electromagnetic wave / sound absorbing structure according to Embodiment 6 of the present invention, and FIG. 15B is an explanation showing the electromagnetic wave / sound absorbing effect in the tunnel of the electromagnetic wave / sound absorbing structure. FIG. FIG. 16 is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing yarn according to the seventh embodiment of the present invention. FIG. 17 is a partial perspective view showing a state in which the electromagnetic wave shielding yarn according to the eighth embodiment of the present invention is wound around a high voltage electric wire.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that, in the second and subsequent embodiments, the same symbols and the same reference numerals as those in the first embodiment are parts that have the same or corresponding functions as those in the first embodiment, and therefore, duplicate description is omitted here.

Embodiment 1
First, Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1 is an explanatory view showing a process of manufacturing an electromagnetic wave / sound absorbing yarn according to Embodiment 1 of the present invention. FIG. 2 (a) is a partially enlarged view showing the structure of the electromagnetic wave / sound absorbing yarn according to the first embodiment of the present invention, and FIG. 2 (b) shows the structure of the electromagnetic wave / sound absorbing fabric according to the first embodiment of the present invention. It is a perspective view. FIG. 3 is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing fabric according to the first embodiment of the present invention. FIG. 4A is a perspective view showing a method of manufacturing the electromagnetic wave / sound absorbing sheet according to the first embodiment of the present invention, and FIG. 4B shows the structure of the electromagnetic wave / sound absorbing sheet according to the first embodiment of the present invention. It is a perspective view.

  As shown in FIG. 1, the electromagnetic wave / sound absorbing yarn according to the first embodiment is knitted by chain stitching a plurality of transparent polyester fibers 1 and carbon fibers 2 as ordinary spinnable fibers. A production method is employed in which the carbon fiber 2 is continuously knitted by passing one transparent polyester fiber 1 every 2 to 5 chain stitches. In this way, after repeatedly knitting the transparent polyester fiber 1 once every two to five times, the carbon fiber 2 is cut along the transparent polyester fiber 1 between the transparent polyester fibers 1.

  As a result, as shown in FIG. 2 (a), an electromagnetic wave / sonic wave having a structure in which a short carbon fiber beard-like protruding portion 2A is formed on a chain of transparent polyester fiber 1 and carbon fiber 2 sewn. The absorbent yarn 3 can be easily produced. Since the beard-like protruding portion 2A is a carbon fiber and has electrical conductivity, electromagnetic waves having a frequency corresponding to the length of the entire short carbon fiber including the protruding portion 2A of the carbon fiber can be strongly absorbed.

  Further, since the protruding portion 2A of the carbon fiber has rigidity, it has an action of dispersing air and dissipating sound waves, and therefore functions as a sound absorbing yarn. Accordingly, if a woven fabric is woven using the electromagnetic wave / sound absorbing yarn 3, an electromagnetic wave / sound absorbing fabric having a high electromagnetic wave / sound absorbing ability is obtained.

  In the first embodiment, as shown in FIG. 2 (b), an electromagnetic wave / sound absorbing fabric 5 having a coarse texture of about 10 mm is woven using the electromagnetic wave / sound absorbing yarn 3. Thus, the electromagnetic wave / sound absorbing fabric 5 can be seen through the other side while having strong electromagnetic wave / sound absorbing performance.

  Next, the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing fabric 5 will be described with reference to FIG. As shown in FIG. 3, in the electromagnetic wave absorption characteristic measurement test in the first embodiment, the incident angle of the radio wave is 90 degrees, that is, perpendicular to the sample surface. In the metal reflector, the radio wave is totally reflected in any frequency band ranging from 1.0 GHz to 15.0 GHz, which is the measurement range, so that the radio wave absorption is approximately 0 dB (decibel).

  Here, when an styrene foam plate having a thickness of 10 mm was placed on a metal reflector and a large number of carbon fibers cut into a length of 20 mm were dispersed on the metal reflector, an electromagnetic wave absorption characteristic measurement test was performed. As shown in FIG. 2, the radio wave absorption characteristics having a large peak in the vicinity of 5.8 GHz, which is the frequency of the radio wave used in the ETC system.

  As a result, it has been found that a carbon fiber having a length of 20 mm is effective for absorbing a radio wave having a frequency of 5.8 GHz. Therefore, the carbon fiber of the electromagnetic wave / sound absorbing yarn 3 constituting the electromagnetic wave / sound absorbing fabric 5 is used. When the electromagnetic wave / sound absorbing fabric 5 was woven with the length of the entire short carbon fiber including the protruding portion 2A of about 20 mm, and an electromagnetic wave absorption characteristic measurement test was conducted, as shown in FIG. 3, it was about 5.8 GHz. An electromagnetic wave absorption characteristic of 20 dB was shown.

  Accordingly, the electromagnetic wave / sound absorbing fabric 5 formed by weaving the electromagnetic wave / sound absorbing yarn 3 having a short carbon fiber length of about 20 mm is excellent in the ability to absorb radio waves in a frequency band centered on 5.8 GHz. It has been found.

  Next, an electromagnetic wave / sound absorbing sheet manufactured using the electromagnetic wave / sound absorbing fabric 5 will be described with reference to FIG.

  As shown in FIG. 4 (a), in the first embodiment, the top and bottom of the electromagnetic wave / sound absorbing fabric 5 have a large number of pores in the range of 500 nm to 1 μm on the transparent whole surface as a thin organic synthetic resin sheet. A vinyl sheet 6 (thickness of about 0.1 mm) with a through hole of 20% is sandwiched between them, and the upper and lower vinyl sheets 6 are adhered to the electromagnetic wave / sound absorbing fabric 5 using a weather-resistant adhesive. Yes. In this way, as shown in FIG. 3B, the electromagnetic wave / sonic wave absorbing sheet 8 according to the first embodiment is obtained.

  Here, the electromagnetic wave / sound absorbing fabric 5 uses the electromagnetic wave / sound absorbing yarn 3 having a structure in which the short carbon fiber 2A is entangled with the transparent polyester fiber 1 and has a coarse texture of about 10 mm. See through. Furthermore, since a thin organic synthetic resin sheet sandwiching the upper and lower sides is made of a transparent vinyl sheet 6 having a large number of through holes in the range of 500 nm to 1 μm on the entire surface, air may pass therethrough. It is possible to exhibit a sound wave absorbing effect and has translucency.

  In this way, the electromagnetic wave / sound absorbing sheet 8 can be seen through the other side while having an excellent electromagnetic wave / sound absorbing effect. Therefore, the electromagnetic wave / sound absorption sheet is particularly suitable for electromagnetic wave / sound absorption applications that need to be transparent or translucent.

  In the first embodiment, the electromagnetic wave / sound absorbing yarn 3 having a structure in which a short carbon fiber 2A is wound around a transparent polyester fiber 1 as a normal spinnable fiber has been described. However, the present invention is limited to the short carbon fiber 2A. Rather than electromagnetic wires and sound-absorbing yarns with a structure in which short metal wires such as copper wires and stainless steel wires are wound, and substrates such as paper, cloth, and plastic films, metals such as gold, silver, copper, and carbon An electromagnetic wave / acoustic absorption yarn having a structure in which a conductive material is coated, cut into thin pieces, and shortly cut is wound.

  Also, the usual spinnable fiber is not limited to the transparent polyester fiber 1, but other usual spinnable properties such as transparent or opaque synthetic fibers such as transparent nylon fibers and opaque nylon fibers. Fiber can also be used.

  Furthermore, although the transparent vinyl sheet 6 in which a large number of through-holes having a hole diameter in the range of 500 nm to 1 μm are formed on the entire surface as a thin organic synthetic resin sheet with an aperture ratio of 20% is used, the sound absorption characteristic is not required. In some cases, there may be no through-hole, and when there is no requirement for transparency or translucency, other thin organic synthetic resin sheets that are translucent or opaque may be used.

  In addition, the electromagnetic wave / sound absorbing sheet 8 according to the first embodiment includes a weather resistant adhesive sandwiched between a transparent vinyl sheet 6 as a thin organic synthetic resin sheet having a thickness of about 0.1 mm. However, when a large number of through holes are not formed, it can be formed into a sheet by thermocompression bonding.

  Here, normal sound barriers such as highways are made of a thick material that absorbs sound or reflects sound, so the outside cannot be seen at all. Enjoying the scenery was also hindered. However, the sound absorbing sheet 8 according to the first exemplary embodiment of the present invention can be seen through the other side even when one or several sheets are stacked, so that it is not obstructive to enjoy the scenery without giving a feeling of blockage. A soundproof wall can be constructed.

Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5A is a cross-sectional view showing the structure of an electromagnetic wave / acoustic wave absorbing plate according to Embodiment 2 of the present invention, and FIG. 5B is a perspective view showing the entire structure. FIG. 6 is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing plate according to the second embodiment of the present invention.

  As shown in FIG. 5A, the electromagnetic wave / sound absorbing plate 10 according to the second embodiment is manufactured using three electromagnetic wave / sound absorbing fabrics 5A, 5B, and 5C having different weave roughness. Has been. The electromagnetic wave / sound absorbing yarn 3 used for weaving the electromagnetic wave / sound absorbing fabric 5A, 5B, 5C is the same electromagnetic wave / sound absorbing yarn 3 as in the first embodiment.

  The electromagnetic wave / acoustic absorption fabric 5A is made by weaving the electromagnetic wave / acoustic absorption yarn 3 into a 40 mm mesh coarse lattice, and the electromagnetic wave / acoustic absorption fabric 5B is an electromagnetic wave / acoustic absorption yarn 3 having a roughness of 30 mm mesh. The electromagnetic wave / sound absorbing fabric 5C is formed by weaving the electromagnetic wave / sound absorbing yarn 3 into a 20 mm mesh coarse lattice.

  As shown in FIG. 5A, a foamed polystyrene plate 11 having a thickness of 10 mm as an organic synthetic resin plate is sandwiched between these three electromagnetic wave / sound absorbing fabrics 5A, 5B, and 5C. ), The electromagnetic wave / sonic wave absorbing plate 10 according to the second embodiment is manufactured by fastening the periphery with a frame 12.

  Next, the electromagnetic wave absorption characteristics of the electromagnetic wave / sonic wave absorbing plate 10 according to the second embodiment having such a configuration will be described with reference to FIG. As shown in FIG. 6, in the electromagnetic wave absorption characteristic measurement test in the second embodiment, the incident angle of radio waves is set to 75 degrees (that is, an angle inclined from 90 degrees to 15 degrees vertically). In the metal reflector, the radio wave is totally reflected in any frequency band, and therefore, the radio wave absorption is approximately 0 dB (decibel).

  On the other hand, when the electromagnetic wave / sound absorbing fabric 3C formed by weaving the electromagnetic wave / sound absorbing yarn 3 in a 20 mm mesh coarse grid is placed on a metal reflector through a 10 mm thick polystyrene plate and measured. As shown in FIG. 6, radio wave absorption of 20 dB or more was observed at a frequency of 5.8 GHz.

  Further, when the electromagnetic wave / sound absorbing plate 10 according to the second embodiment is measured on a metal reflector through a foamed polystyrene plate having a thickness of 10 mm, as shown in FIG. 6, at a frequency of 5.8 GHz. Radio wave absorption near 30 dB was observed at a frequency of 25 dB or more and a frequency of 6.0 GHz.

表１に示されるように、電磁波・音波吸収プレート１０の周波数５．８ＧＨｚにおける電波吸収量は、２６．５ｄＢと大きい値を示している。本実施の形態２における電磁波吸収特性測定試験においては、電波の入射角を７５度としているため、垂直入射する電波のみでなく、斜めに入射する電波をも強力に吸収することが判明した。従って、本実施の形態２にかかる電磁波・音波吸収プレート１０は、周波数５．８ＧＨｚの電波を使用するＥＴＣシステムの隣り合うゲートの間を電磁波的に遮断するために、極めて有効であることが分かった。 These measurement results are summarized in Table 1.

As shown in Table 1, the electromagnetic wave absorption amount of the electromagnetic wave / acoustic wave absorbing plate 10 at a frequency of 5.8 GHz is a large value of 26.5 dB. In the electromagnetic wave absorption characteristic measurement test in the second embodiment, since the incident angle of radio waves is set to 75 degrees, it has been found that not only vertically incident radio waves but also obliquely incident radio waves are strongly absorbed. Therefore, it can be seen that the electromagnetic wave / acoustic wave absorbing plate 10 according to the second embodiment is extremely effective for electromagnetically blocking between the adjacent gates of the ETC system using the radio wave having a frequency of 5.8 GHz. It was.

Embodiment 3
Next, Embodiment 3 of the present invention will be described with reference to FIGS. 7A is a perspective view showing a construction state of the electromagnetic wave / sound absorbing sheet according to the third embodiment of the present invention on the inner wall of the tunnel, and FIG. 7B is an electromagnetic wave / sound absorbing effect in the tunnel of the electromagnetic wave / sound absorbing sheet. It is explanatory drawing which shows. FIG. 8 is a perspective view showing an example of use of the electromagnetic wave / sound absorbing plate according to the third embodiment of the present invention at a toll gate on an expressway.

  As shown in FIG. 7A, the electromagnetic wave / sound absorbing sheet 8 described in the first embodiment is used as the electromagnetic wave / sound absorbing sheet for construction on the inner wall of the tunnel according to the third embodiment. .

  As described in the first embodiment, the electromagnetic wave / sound absorbing sheet 8 is made by weaving a rough electromagnetic wave / sound absorbing fabric 5 having a texture of about 10 mm using the electromagnetic wave / sound absorbing yarn 3, and 5 is sandwiched between a vinyl sheet 6 in which a large number of through-holes having a hole diameter in the range of 500 nm to 1 μm are formed on a transparent entire surface having a thickness of about 0.1 mm on the upper and lower sides of 5 with a weather-resistant adhesive. The upper and lower vinyl sheets 6 are bonded to the electromagnetic wave / sound absorbing fabric 5 using

  Therefore, the electromagnetic wave / sound absorption sheet 8 has excellent electromagnetic wave absorption performance and sound wave absorption performance, is extremely light and thin, and is very easy to install on the inner wall of the tunnel T.

  Conventionally, in an automobile road tunnel T as shown in FIG. 7 (a), noises such as engine sound and running sound emitted from the automobile V are echoed and amplified on the inner wall of the tunnel T, resulting in greater noise. It was happening. In addition, in the car navigation system (hereinafter referred to as “car navigation”), the radio waves from the satellites are repeatedly reflected on the inner wall of the tunnel T and the road surface, causing irregular reflection noise, so that the car navigation system cannot be used in the tunnel T. There was also a situation of becoming.

  However, by attaching and constructing the electromagnetic wave / sound absorbing sheet 8 on the entire inner wall of the tunnel T, as shown in FIG. 7 (b), the engine sound / running sound, etc. emitted from the automobile V indicated by the solid line arrow, etc. This noise is absorbed by the electromagnetic wave / sonic wave absorbing sheet 8 and does not reverberate, so that a larger noise is not generated. Further, the radio wave from the satellite for car navigation indicated by the broken arrow is not absorbed by the electromagnetic wave / sound absorbing sheet 8 to cause irregular reflection noise, and the car navigation can be used as usual in the tunnel T.

  Next, the electromagnetic wave / sound absorbing plate 15 according to the third embodiment will be described with reference to FIG. The electromagnetic wave / sound absorbing plate 15 according to the third embodiment is the same as the electromagnetic wave / sound absorbing plate 10 according to the second embodiment, except that a transparent acrylic resin plate is used instead of the styrofoam plate 11 as an organic synthetic resin plate. It is.

  In recent years, with the spread of ETC, the number of automobiles V equipped with ETC on-board units has increased, and as shown in FIG. 8, a plurality of ETC gates 16G are provided at a toll gate TG. Yes. Here, an electromagnetic wave shielding plate is provided between the adjacent ETC gates 16G in order to prevent radio wave mixing between the adjacent ETC gates 16G. However, since the conventional electromagnetic wave shielding plate is opaque, the adjacent ETC gates are not provided. There was a problem that it was not possible to confirm the movement of another vehicle V passing through 16G.

  However, the electromagnetic wave / sound absorbing plate 15 according to the third exemplary embodiment has three electromagnetic wave / sound absorbing fabrics 5A having a coarse texture of 40 mm mesh, 30 mm mesh, and 20 mm mesh with a transparent acrylic resin plate interposed therebetween. Since the other side can be seen through because it is composed of 5B and 5C, the movement of the other vehicle V passing through the adjacent ETC gate 16G can be confirmed, and radio wave crossing can be reliably prevented. .

Embodiment 4
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 9A is an enlarged view showing a method for producing an electromagnetic wave / acoustic absorption yarn for forming an electromagnetic wave / acoustic absorption structure according to Embodiment 4 of the present invention, and FIG. It is an enlarged view which shows a state. FIG. 10A is a perspective view showing a method for manufacturing an electromagnetic wave / sound absorbing structure according to Embodiment 4 of the present invention, and FIG. 10B is a perspective view showing a completed state of the electromagnetic wave / sound absorbing structure.

  FIG. 11A is a perspective view showing a method for manufacturing an electromagnetic wave / sound absorbing structure according to a first modification of Embodiment 4 of the present invention, and FIG. 11B is an electromagnetic wave / sound absorbing structure according to the first modification. It is a perspective view which shows the completion state of. FIG. 12A is a perspective view showing a method for manufacturing an electromagnetic wave / sound absorbing structure according to a second modification of Embodiment 4 of the present invention, and FIG. 12B is an electromagnetic wave / sound absorbing structure according to the second modification. It is a perspective view which shows the completion state of. FIG. 13: is a perspective view which shows the usage example in the toll booth of the electromagnetic wave and sound wave absorption structure concerning Embodiment 4 of this invention and the 2nd modification of Embodiment 4 of this invention.

  As shown in FIGS. 9A and 9B, the electromagnetic wave / sound absorbing yarn 9 according to the fourth embodiment is made of glass fiber over the entire length of the electromagnetic wave / sound absorbing yarn 3 according to the first embodiment. After winding 4, polyethylene 7 as an organic synthetic resin is coated over the entire length. As a method for coating polyethylene 7, the total length of electromagnetic wave / sound absorbing yarn 3 shown in FIG. 9A is applied to a solution obtained by dissolving polyethylene 7 in an organic solvent or a melt obtained by heating and melting polyethylene 7. For example, a method in which a glass fiber 4 is wound around the glass fiber 4 is immersed.

  When the method of immersing in a polyethylene solution is employed, the organic solvent is removed by lifting and drying, and when the method of immersing in a polyethylene melt is employed, it is lifted and cooled to obtain FIG. The electromagnetic wave / sound absorption yarn 9 shown in b) can be obtained. Here, as shown in FIG. 9 (a), since the glass fiber 4 is first wound over the entire length of the electromagnetic wave / sound absorbing yarn 3, even if it is immersed in a high-temperature polyethylene melt, it is possible to use it normally. The transparent polyester fiber as the spinning fiber 1 does not melt.

  The electromagnetic wave / sound absorbing yarn 9 having such a structure is excellent in water resistance because it is coated with polyethylene 7 over the entire length, and the electromagnetic wave / sound absorbing fabric formed by weaving the electromagnetic wave / sound absorbing yarn 9 does not seal. Can also be used outdoors. Thus, by coating the electromagnetic wave / sound absorbing yarn 3 provided with many spine-like protruding portions 2A of the carbon fiber 2 on the usual spinnable fiber 1 with the polyethylene 7, it has a larger electromagnetic wave / sound absorbing performance. However, it is excellent in water resistance and can be woven with a loom just like ordinary spinnable fibers.

  Next, a method of manufacturing an electromagnetic wave / sound absorbing structure using the electromagnetic wave / sound absorbing yarn 9 having such a configuration will be described with reference to FIG.

  As shown in FIG. 10 (a), two sheets of electromagnetic wave / acoustic wave absorbing yarns 9 stretched in parallel with an interval of 20 mm are produced on a frame body 17 made of a thin stainless steel pipe. And these two sheets are adhere | attached on both sides of the dielectric material sheet 18 which consists of glass fiber so that the direction of the electromagnetic wave and sound wave absorption thread | yarn 9 stretched on the frame 17 may become perpendicular | vertical mutually.

  The electromagnetic wave / sound absorbing structure thus manufactured is fixed to the upper surface of the frame 24 made of reinforced plastic as shown in FIG. 10 (b), and is used as a metal net shown in FIG. 10 (a). A stainless steel wire mesh 23 is fixed to the bottom surface of the frame body 24. Thereby, as shown in FIG. 10B, the electromagnetic wave / sound absorption structure 20 according to the fourth embodiment is completed.

  The electromagnetic wave / sound absorbing yarn 9 was stretched with an interval of 20 mm in order to absorb the 5.8 GHz radio wave used for the ETC system, and the thickness of the frame 24 was 10 mm, so An interval of about 10 mm is generated between the electromagnetic wave / sound absorption structure and the stainless steel wire mesh 23 on the bottom surface, which is also to absorb the 5.8 GHz radio wave used in the ETC system. The electromagnetic wave / sound absorbing structure 20 manufactured in this way is excellent in water resistance because it uses the electromagnetic wave / sound absorbing yarn 9, and can be used outdoors without any problems.

  Next, the manufacturing method of the electromagnetic wave and sound wave absorption structure concerning the 1st modification of this Embodiment 4 is demonstrated with reference to FIG.

  As shown in FIG. 11 (a), the electromagnetic wave / sound absorbing fabric 21 used in the electromagnetic wave / sound absorbing structure according to the first modification of the fourth embodiment is the same as the electromagnetic wave / sound absorbing fabric according to the first embodiment. The electromagnetic wave / acoustic absorption yarn 22 coated with a fluororesin over the entire length of the acoustic absorption yarn 3 is woven in a lattice shape with an interval of 20 mm. Here, as a method of coating the fluororesin, a method of removing the solvent by immersing the electromagnetic wave / acoustic absorption yarn 3 in the fluororesin solution and then removing the solvent may be used, or a method of baking a gaseous fluororesin may be used. .

  Further, as shown in FIG. 11A, a stainless steel wire net 23 is prepared as a metal net having the same dimensions as the electromagnetic wave / sound absorbing fabric 21. Here, the stainless steel wire mesh 23 is preferably made of a stainless steel wire as thin as possible in order to have excellent translucency when superimposed on the electromagnetic wave / sound absorbing fabric 21 and to make the other side visible. Moreover, since it plays a role of reflecting electromagnetic waves, it is preferable that the mesh of the metal mesh 23 is finer. In the first modification of the fourth embodiment, a stainless steel wire mesh 23 made of a stainless steel wire having a thickness of 0.5 mm and having a mesh size of 2 mm to 3 mm is used.

  As shown in FIG. 11 (b), the electromagnetic wave / sound absorbing fabric 21 and the stainless steel wire mesh 23 are respectively attached to both sides of a reinforced plastic frame 24, and the thickness of the frame 24 (10 mm). It is constituted so as to face each other with a gap of only. As a result, the electromagnetic wave / sound absorption structure 25 according to the first modification of the fourth embodiment is completed.

  The electromagnetic wave / sound absorption structure 25 according to the first modification of the fourth embodiment having such a configuration is mainly used indoors. For example, a thin wooden board can be pasted on the electromagnetic wave / sound absorbing fabric 21 on the upper surface of the electromagnetic wave / sound absorbing structure 25 and applied as a structural material (wall panel) for the wall surface of a house.

  Next, the manufacturing method of the electromagnetic wave and sound wave absorption structure concerning the 2nd modification of this Embodiment 4 is explained with reference to FIG.

  As shown in FIG. 12A, the electromagnetic wave / sound absorbing structure 21A used in the electromagnetic wave / sound absorbing structure according to the second modification of the fourth embodiment is made of the thin stainless steel pipe described above. The above-described electromagnetic wave / sound absorbing yarn 9 is stretched vertically and horizontally at an interval of 20 mm on the frame 17.

  As shown in FIG. 12 (b), the electromagnetic wave / sound absorption structure 21A and the above-described stainless steel wire mesh 23 are attached to both surfaces of the above-mentioned reinforced plastic frame 24, respectively. It is configured to face each other with a gap of 10 mm. Thereby, the electromagnetic wave / sound absorption structure 25A according to the second modification of the fourth embodiment is completed.

  Here, the stainless steel wire mesh 23 is preferably made of a stainless steel wire as thin as possible in order to have excellent translucency when superimposed on the electromagnetic wave / sound absorbing structure 21A and to make the other side visible. . Moreover, since it plays a role of reflecting electromagnetic waves, it is preferable that the mesh of the metal mesh 23 is finer. In the second modification of the fourth embodiment, a stainless steel wire mesh 23 made of a stainless steel wire having a thickness of 0.5 mm and having a mesh size of 2 mm to 3 mm is used.

  In the second modification of the fourth embodiment, the thickness of the frame body 24 is set to 10 mm, which is the same as the reason why the eye of the electromagnetic wave / sound absorbing structure 21A is set to 20 mm, and the ETC system. This is to absorb the 5.8 GHz radio wave used in the above.

  Next, a usage example of the electromagnetic wave / sound absorbing structure 20 according to the fourth embodiment and the electromagnetic wave / sound absorbing structure 25A according to the second modification of the fourth embodiment will be described with reference to FIG. .

  As shown in FIG. 13, two ETC gates 16G are installed next to each other at the toll gate TG on the highway. The electromagnetic wave / sound absorbing structure 25A according to the second modification of the fourth embodiment is installed between the two ETC gates 16G and functions to prevent radio wave crosstalk. As described above, the electromagnetic wave / sound absorption structure 25A is excellent in translucency, and the other side can be seen well, so the driver of the automobile V1 and the driver of the automobile V3 can see each other's movement well, and the ETC gate 16G. You can pass through with confidence.

  Further, as shown in FIG. 13, the electromagnetic wave / sound absorbing structure 20 according to the fourth embodiment is attached obliquely to the roof of the toll gate TG diagonally above the radio wave transmitter of the ETC gate 16G. ing. As a result, the radio wave transmitted from the radio wave transmission unit of the ETC gate 16G reaches only the automobiles V1 and V3 that are about to pass through the ETC gate 16G, and the radio wave that travels backward is absorbed by the electromagnetic wave / acoustic wave absorbing structure 20. Therefore, it is possible to prevent a situation where a cross line occurs between the following automobiles V2, V4 and the automobiles V1, V3.

  In this way, the electromagnetic wave / sound absorbing structure 20 according to the fourth embodiment and the electromagnetic wave / sound absorbing structure 25A according to the second modification of the fourth embodiment ensure crosstalk of radio waves in the ETC gate 16G. Can be prevented.

  The electromagnetic wave / sound absorbing structure 20 is composed of an electromagnetic wave / sound absorbing thread 9 coated with polyethylene 7, a frame 17 made of stainless steel pipe, a stainless steel wire mesh 23, and a frame 24 made of reinforced plastic. Similarly, the electromagnetic wave / sound absorbing structure 25A is composed of an electromagnetic wave / sound absorbing yarn 9 coated with polyethylene 7, a frame 17 made of stainless steel pipe, a stainless steel wire mesh 23, and a frame 24 made of reinforced plastic. Therefore, both have excellent water resistance and can withstand outdoor use.

Embodiment 5
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 14A is a perspective view showing the structure of the electromagnetic wave / sound absorbing structure according to the fifth embodiment of the present invention, and FIG. FIG.

  As shown in FIG. 14 (a), the electromagnetic wave / sound absorbing structure 26 according to the fifth embodiment is provided on the outer peripheral surface of a vinyl chloride pipe 27 as a plastic pipe on the polyethylene 7 according to the fourth embodiment. The electromagnetic wave / acoustic wave absorbing yarn 9 coated with is wound and fixed at a constant pitch P in the Z direction and the S direction, and an aluminum pipe 28 as a metal pipe is passed through the vinyl chloride pipe 27 to pass through the vinyl chloride pipe. By being inserted into caps 29 fitted to both ends of 27, it is supported so as to be positioned along the center line of the vinyl chloride pipe 27.

  Part of the electromagnetic wave incident on the electromagnetic wave / sound absorption structure 26 having such a structure is first absorbed by the electromagnetic wave / sound absorption yarn 9 on the outer peripheral surface of the vinyl chloride pipe 27, and then by the aluminum pipe 28 inside the vinyl chloride pipe 27. It is reflected and again absorbed by the electromagnetic wave / sound absorbing yarn 9 on the outer peripheral surface. As a result, electromagnetic waves incident on the electromagnetic wave / sound absorbing structure 26 from any direction can be strongly absorbed. Since the sound wave is absorbed by the electromagnetic wave / sound absorbing yarn 9 on the outer peripheral surface of the vinyl chloride pipe 27, excellent electromagnetic wave / sound absorbing performance is exhibited.

  The inner diameter of the vinyl chloride pipe 27 (more precisely, the distance from the surface of the inner aluminum pipe 28 to the electromagnetic wave / sound absorbing yarn 9 on the outer peripheral surface) and the pitch P around which the electromagnetic wave / sound absorbing yarn 9 is wound are the electromagnetic waves to be absorbed. By setting according to the wavelength, it is possible to efficiently absorb the electromagnetic wave having the target wavelength. In the fifth embodiment, the pitch P is set to 20 mm, and the distance from the surface of the aluminum pipe 28 to the electromagnetic wave / sound absorbing yarn 9 on the outer peripheral surface is set to 10 mm.

  Next, a usage example of the electromagnetic wave / sound absorbing structure 26 having such a structure will be described with reference to FIG. As shown in FIG. 14B, two ETC gates 16G are installed adjacent to each other at the toll gate TG on the highway. Between these two ETC gates 16G, an electromagnetic wave according to a modification of the fifth embodiment in which a plurality of electromagnetic wave / sound absorbing structures 26 according to the fifth embodiment are arranged in the horizontal direction at regular intervals. A sound wave absorbing structure 30 is installed and functions to prevent crosstalk of radio waves.

  In the electromagnetic wave / sound absorbing structure 30 according to the modification of the fifth embodiment, a pair of support columns 31 are erected on the bottom plate 32, and a plurality of electromagnetic wave / The sound absorbing structure 26 is supported horizontally at regular intervals in the vertical direction. Since the electromagnetic wave / sound absorbing structure 30 includes a plurality of electromagnetic wave / sound absorbing structures 26, the electromagnetic wave incident from any direction can be strongly absorbed. Since there is a space in the vertical direction, the driver of the automobile V passing through the ETC gate 16G can see the movement of the automobile V passing through the adjacent ETC gate 16G well.

  In the fifth embodiment, an opaque vinyl chloride pipe 27 is used as the plastic pipe constituting the electromagnetic wave / sound absorbing structure 26. However, the plastic pipe is a transparent pipe such as a transparent acrylic resin pipe. By using the thing, the movement of the automobile V passing through the adjacent ETC gate 16G can be seen well.

Embodiment 6
Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 15A is a perspective view showing the structure of the electromagnetic wave / sound absorbing structure according to Embodiment 6 of the present invention, and FIG. 15B is an explanation showing the electromagnetic wave / sound absorbing effect in the tunnel of the electromagnetic wave / sound absorbing structure. FIG.

  As shown in FIG. 15 (a), the electromagnetic wave / sound absorbing structure 35 according to the sixth embodiment has a metal wire mesh 23 made of stainless steel as a metal mesh on the inner wall surface of a tunnel T as a wall surface to be installed. The electromagnetic wave / acoustic wave absorbing yarn 9 is vertically and horizontally spaced 20 mm apart from the frame 17 made of a thin stainless steel pipe as described above through the metal channel member 36 having a predetermined channel interval. A stretched electromagnetic wave / sound absorption structure 21A is attached.

  As a result, the electromagnetic wave incident from the electromagnetic wave / sound absorbing structure 21A side is first partially absorbed by the electromagnetic wave / sound absorbing structure 21A, reflected by the stainless steel wire mesh 23, and again reflected by the electromagnetic wave / sound absorbing structure 21A. Absorbed when passing through.

  Here, since the interval between the stainless steel wire mesh 23 and the electromagnetic wave / sound absorbing structure 21A is a predetermined interval that matches the wavelength of the electromagnetic wave to be absorbed by the metal channel member 36, the incident electromagnetic wave And the electromagnetic waves reflected by the stainless steel wire mesh 23 cancel each other, so that the electromagnetic waves can be absorbed more effectively.

  There is a predetermined gap between the stainless steel wire mesh 23 fixed to the wall surface and the electromagnetic wave / sound absorbing structure 21A, and air can freely pass therethrough. Excellent sound absorption characteristics are exhibited by 21A. Furthermore, as described above, the electromagnetic wave / sound absorbing structure 21A has water resistance and is suitable for use on the inner wall of the tunnel.

  Conventionally, in an automobile road tunnel T as shown in FIG. 15 (b), noises such as engine sound and running sound emitted from the automobile V are echoed and amplified on the inner wall of the tunnel T, and more noise is generated. It was happening. As for the car navigation system, there is a situation in which the car navigation system becomes unusable in the tunnel T due to irregular reflection noise caused by the radio waves from the satellite being repeatedly reflected on the inner wall of the tunnel T and the road surface.

  However, by attaching and constructing the electromagnetic wave / sound absorbing structure 35 over the entire inner wall of the tunnel T, as shown in FIG. 15B, the engine sound / running sound emitted from the automobile V indicated by the solid line arrow. Such noise is not absorbed by the electromagnetic wave / sonic wave absorbing structure 35 and does not reverberate, and thus no larger noise is generated. In addition, radio waves from a satellite for car navigation indicated by broken arrows are not absorbed by the electromagnetic wave / sound absorbing structure 35 to cause irregular reflection noise, and the car navigation can be used as usual in the tunnel T. .

Embodiment 7
Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 16 is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave / sound absorbing yarn according to the seventh embodiment of the present invention. In the seventh embodiment, as shown in FIGS. 9A and 9B, the glass fiber 4 is wound around the electromagnetic wave / sound absorbing yarn 3, and the organic synthetic resin 7 is further coated thereon. If the entire length of the short carbon fiber including the protruding portion 2A of the carbon fiber is made almost uniform in the electromagnetic wave / sound absorption yarn 9 to be generated, the frequency band indicating the electromagnetic wave / sound absorption performance becomes very narrow. Since there is a problem, it shows how to solve it.

  That is, the length of the entire short carbon fiber including the protruding portion 2A of the carbon fiber is not made constant, for example, 25 mm ± (1 mm to 5 mm), that is, a random length within the range of 20 mm to 30 mm. Thus, it is possible to widen the frequency band showing the electromagnetic wave / sound absorption performance. A glass fiber 4 is wound around an electromagnetic wave / sound absorbing yarn 3 having a length of a short carbon fiber including a protruding portion 2A of the carbon fiber and a random length within a range of 20 mm to 30 mm, and an organic synthetic resin is further formed thereon. FIG. 16 shows the result of measuring the electromagnetic wave absorption characteristics of the electromagnetic wave / acoustic absorption yarn 9 produced by coating 7. In addition to the glass fiber 4, other fibers such as an insulating fiber such as cotton may be used as the fiber to be wound.

  As shown in FIG. 16, in the electromagnetic wave absorption characteristic measurement test according to the seventh embodiment, the incident angle of radio waves is 90 degrees, that is, perpendicular to the sample surface. Curves S1 and S2 are the results of measurement at different measurement locations. Although the position of the peak is shifted by changing the measurement location, the frequency band showing the electromagnetic wave absorption characteristics is greatly expanded for both the curves S1 and S2. The curve S3 is measured by pressing the electromagnetic wave / sound absorbing yarn 9 according to the seventh embodiment with a plywood plate so that the peak position does not shift even if the measurement location is changed. Although the peak of electromagnetic wave absorption is low, the frequency band showing the electromagnetic wave absorption characteristics is further expanded.

  Thus, by making the length of the entire short carbon fiber including the protruding portion 2A of the carbon fiber constant, for example, 25 mm ± (1 mm to 5 mm), that is, a random length within a range of 20 mm to 30 mm. By doing so, the frequency band showing the electromagnetic wave / sound absorption performance can be expanded.

Embodiment 8
Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 17: is a fragmentary perspective view which shows the state which wound the electromagnetic wave shield thread concerning Embodiment 8 of this invention around the high voltage electric wire. As shown in FIG. 17, in the eighth embodiment, the electromagnetic wave / sound absorbing yarn 3 manufactured by the same manufacturing method as in the first embodiment is used as the electromagnetic shielding yarn.

  The electromagnetic wave can be shielded by winding the electromagnetic wave shielding yarn 3 having the same structure as the electromagnetic wave / acoustic absorption yarn of Embodiment 1 around a target to be electromagnetic wave shielded at a predetermined pitch. As a specific application, for example, when a normal power line is used for communication in high-speed power line communication (PLC), leakage of radio waves from the power line becomes a problem. By winding, it is possible to reliably prevent such leakage of radio waves.

  Here, the electromagnetic shielding yarn 3 is not different from the electromagnetic wave / acoustic absorption yarn 3 in the basic configuration, and is therefore expressed by the same reference numeral.

  In the eighth embodiment, as shown in FIG. 17, when the high voltage electric wire 40 is used as a PLC communication line by winding the electromagnetic shielding yarn 3 around the high voltage electric wire 40 at a predetermined pitch, the high voltage electric wire 40 is used. It is possible to reliably prevent radio waves from leaking. Here, the power line including the high voltage electric wire 40 is not a flat plate but has a long cylindrical three-dimensional shape. In the case of a flat plate, for example, an electromagnetic wave can be shielded even if a thin metal foil is attached, but in the case of a three-dimensional shape such as a power line, the eighth embodiment is used. The electromagnetic wave cannot be shielded unless a cut conductor such as the electromagnetic wave shielding yarn 3 is arranged.

  In the eighth embodiment, as an electromagnetic wave shielding yarn, the carbon fiber 2 is used every 2 to 5 times when the polyester fiber 1 as a normal spinnable fiber is knitted with a carbon fiber 2 and a chain braid at intervals. Although the example which used the electromagnetic wave shielding thread | yarn 3 which cut | disconnects the carbon fiber 2 between the several polyester fibers 1 after having repeatedly knitted moving to the adjacent one of the polyester fiber 1 was demonstrated, In addition to this, various electromagnetic shielding yarns can be used.

  For example, a short carbon fiber or carbon powder or a short metal wire or metal powder is kneaded and spun into an organic synthetic resin or rubber or elastomer, and after the glass fiber is wound over the entire length of the electromagnetic shielding yarn 3, For example, those obtained by coating organic synthetic resin or rubber or elastomer over the entire length, those obtained by coating fluororesin over the entire length of the electromagnetic wave shielding yarn 3, and the like. That is, the above-described electromagnetic wave / sound absorbing yarns 9 and 22 can also be used as electromagnetic shielding yarns as they are.

  In each of the above-described embodiments, a plurality of transparent polyester fibers 1 and carbon fibers 2 as ordinary spinnable fibers are knitted by chain stitching, and then the carbon fibers 2 are cut and electromagnetic wave / sound absorbing yarns 3 and Although the example which forms the electromagnetic wave shielding thread | yarn 3 was demonstrated, in addition to this as an ordinary spinnable fiber, opaque polyester fiber, cotton, silk, hemp, wool, nylon, vinylon, acrylic fiber, vinylidene chloride fiber, Organic fibers such as acetate and rayon, inorganic fibers such as glass fibers, or these fibers can be mixed.

  In addition to carbon fibers, metal wires such as copper wire, plated copper wire, and stainless wire can also be used. Here, the thickness of the metal wire is preferably in the range of 30 μm to 120 μm. Furthermore, a base material such as paper, cloth, or plastic film may be coated with a metal such as gold, silver, copper, or a conductive material such as carbon, cut into small pieces, and cut into short pieces.

  In addition to these, the electromagnetic wave / acoustic absorption yarn and the electromagnetic wave shielding yarn are made by kneading a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer and spinning them. It can also be used.

  Furthermore, in each of the above-described embodiments, the electromagnetic wave / sound absorbing sheet 8, 3 is formed by sandwiching an electromagnetic wave / sound absorbing fabric between two transparent thin organic synthetic resin sheets and a vinyl sheet 6 having a thickness of about 0.1 mm. Electromagnetic wave / sound absorbing plate 10 having a thickness of 10 mm as an organic synthetic resin plate and electromagnetic wave having a transparent acrylic resin plate sandwiched between two electromagnetic wave / sound absorbing fabrics 5A, 5B, 5C -The sound wave absorbing plate 15 and the like have been described, but as the electromagnetic wave / sound absorbing sheet, the electromagnetic wave / sound absorbing plate, the electromagnetic wave / sound absorbing structure, a thin rubber sheet or an elastomer sheet sandwiched between them, Two or more sheets with a predetermined thickness of rubber plate or elastomer plate sandwiched between them, etc. Can be used took also various configurations in addition.

  For example, the electromagnetic wave / sound absorbing fabric is sandwiched between two transparent thin rubber sheets or elastomer sheets and bonded, or two or more laminated with a predetermined thickness rubber plate or elastomer plate between them, Two or more sheets of electromagnetic waves / sound absorbing fabrics, and two or more sheets of electromagnetic waves / sound absorbing fabrics with different textures are stacked on each other and sandwiched between two thin organic synthetic resin sheets. An electromagnetic wave / sound absorbing sheet sandwiched between two thin organic synthetic resin sheets, or two organic synthetic resin plates with multiple through holes perforated on one or more layers of one or more electromagnetic wave / sound absorbing fabrics. Two sheets of electromagnetic waves / sound absorbing plates sandwiched between them, two or more sheets of different weaves of electromagnetic waves / sound absorbing fabrics, with many through holes drilled on the entire surface Electromagnetic-wave-absorbing plate formed by interposing an organic synthetic resin plates, and the like.

  Electromagnetic wave / acoustic absorption yarn, electromagnetic wave / acoustic absorption fabric, electromagnetic wave / acoustic absorption sheet, electromagnetic wave / acoustic absorption plate, electromagnetic wave / acoustic absorption structure and other parts of electromagnetic shielding yarn, configuration, shape, quantity, material, thickness, The thickness, size, connection relationship, and the like are not limited to the above embodiments.

DESCRIPTION OF SYMBOLS 1 Spinnable fiber 2 Carbon fiber 2A Protruding part 3 Electromagnetic wave / acoustic absorption yarn, electromagnetic wave shielding yarn 4 Glass fiber 5, 5A, 5B, 5C, 21 Electromagnetic wave / acoustic absorption fabric 6 Organic synthetic resin sheet 7 Organic synthetic resin 8 Electromagnetic wave / Sound wave absorbing sheets 9, 22 Electromagnetic wave / sound absorbing yarn 10 Electromagnetic wave / sound absorbing plate 11 Organic synthetic resin plate 20, 21A, 25, 25A, 26, 30, 35 Electromagnetic wave / sound absorbing structure 23 Metal net 24 Frame 27 Plastic pipe 28 Metal pipe 29 Cap 36 Channel material 40 High-voltage electric wire

Claims (15)

  An electromagnetic wave / sound absorbing yarn obtained by kneading a short carbon fiber or carbon powder or a short metal wire or metal powder into an organic synthetic resin, rubber or elastomer, and spinning the entire length of the electromagnetic wave / sound absorbing yarn. An electromagnetic wave / sound absorbing yarn characterized by being coated with a resin.   2. An electromagnetic wave / sound absorbing fabric comprising the electromagnetic wave / sound absorbing yarn according to claim 1 woven, or a mixture of the electromagnetic wave / sound absorbing yarn and normal spinnable fiber.   An electromagnetic wave / acoustic absorption fabric formed by weaving an organic synthetic resin, rubber, or elastomer into a short carbon fiber, carbon powder, or a short metal wire or metal powder, and spinning the electromagnetic wave / acoustic absorption yarn, or the electromagnetic wave / acoustic wave An electromagnetic wave / sound absorbing fabric, which is formed by coating a fluororesin over the entire front and back surfaces of an electromagnetic wave / sound absorbing fabric formed by mixing absorbent yarn and ordinary spinnable fibers.   An electromagnetic wave / acoustic absorption fabric formed by weaving an organic synthetic resin, rubber, or elastomer into a short carbon fiber, carbon powder, or a short metal wire or metal powder, and spinning the electromagnetic wave / acoustic absorption yarn, or the electromagnetic wave / acoustic wave One or two or more electromagnetic / sound absorbing fabrics woven by mixing absorbent yarn and ordinary spinnable fiber, and sandwiched between two thin organic synthetic resin sheets, rubber sheets, or elastomer sheets, and thermocompression bonded An electromagnetic wave / sound absorption sheet characterized by being made into a thin and highly flexible sheet.   An electromagnetic wave / acoustic absorption fabric formed by weaving an organic synthetic resin, rubber, or elastomer into a short carbon fiber, carbon powder, or a short metal wire or metal powder, and spinning the electromagnetic wave / acoustic absorption yarn, or the electromagnetic wave / acoustic wave Two thin organic composites of two or more layers of electromagnetic waves / sound-absorbing fabrics made by mixing and weaving absorbent yarns and normal spinnable fibers, with two or more layers having different textures of the electromagnetic waves / sound-absorbing yarns stacked on top of each other An electromagnetic wave / sonic wave absorbing sheet characterized by being made into a thin and highly flexible sheet by being sandwiched between a resin sheet, a rubber sheet or an elastomer sheet and heat-pressed.   An electromagnetic wave / acoustic absorption fabric formed by weaving an organic synthetic resin, rubber, or elastomer into a short carbon fiber, carbon powder, or a short metal wire or metal powder, and spinning the electromagnetic wave / acoustic absorption yarn, or the electromagnetic wave / acoustic wave One or two or more electromagnetic wave / sound absorbing fabrics woven by mixing absorbent yarn and ordinary spinnable fiber are laid, and a large number of through-holes having a hole diameter in the range of 100 nm to 1 mm are opened. Electromagnetic wave, characterized in that it is made into a thin and highly flexible sheet by sandwiching and adhering between two thin organic synthetic resin sheets or rubber sheets or elastomer sheets perforated within a range of 5% to 30% Sound absorption sheet.   An organic synthetic resin plate, a rubber plate or an elastomer plate having a predetermined thickness is sandwiched between the electromagnetic wave / sound absorbing fabrics according to claim 2 or 3 having different textures of the electromagnetic wave / sound absorbing yarns. An electromagnetic wave / sound absorbing plate characterized in that it is formed into a thick and low-flexible plate by laminating more than one sheet and bonding or thermocompression bonding.   An electromagnetic wave / acoustic absorption fabric formed by weaving an organic synthetic resin, rubber, or elastomer into a short carbon fiber, carbon powder, or a short metal wire or metal powder, and spinning the electromagnetic wave / acoustic absorption yarn, or the electromagnetic wave / acoustic wave An organic synthetic resin plate or rubber plate of a predetermined thickness between electromagnetic waves / sound absorbing fabrics of different sizes of electromagnetic waves / sound absorbing yarns woven by mixing absorbent yarns and ordinary spinnable fibers. Alternatively, an electromagnetic wave / acoustic wave absorbing plate characterized in that two or more layers are laminated with an elastomer plate in between and bonded or heat-pressed to form a thick and low flexibility plate.   The electromagnetic wave / sound absorbing fabric has a coarse texture of 1 mm to 200 mm, and the two thin organic synthetic resin sheets or rubber sheets or elastomer sheets, or the organic synthetic resin plate or rubber plate or elastomer plate of the predetermined thickness are transparent. The electromagnetic wave / sound absorbing sheet or the electromagnetic wave / sound absorbing plate according to claim 4, wherein the electromagnetic wave / sound absorbing sheet is provided.   The electromagnetic wave / sound absorbing yarn according to claim 1, wherein the electromagnetic wave / sound absorbing yarn stretched in parallel with each other at a predetermined interval on a frame and sandwiched between two sheets with a dielectric sheet interposed therebetween. An electromagnetic wave / sound absorption structure characterized by being stacked vertically or by stretching the electromagnetic wave / sound absorption yarn according to claim 1 vertically and horizontally on a frame.   Electromagnetic wave / acoustic absorption yarn obtained by kneading and spinning short carbon fiber or carbon powder or short metal wire or metal powder into organic synthetic resin or rubber or elastomer is stretched across the frame in parallel with a predetermined interval. The electromagnetic wave / sound absorbing yarn stretched over each other with a dielectric sheet sandwiched between two sheets is vertically stacked, or the electromagnetic wave / sound absorbing yarn is stretched vertically and horizontally on a frame. An electromagnetic wave / sound absorption structure characterized by that.   A metal net is opposed to the electromagnetic wave / sound absorbing fabric according to claim 2 or claim 3 or the electromagnetic wave / sound absorbing structure according to claim 10 or 11 at a predetermined interval. An electromagnetic wave / sound absorption structure characterized in that both are fixed to a frame.   The electromagnetic wave / sound absorbing fabric according to claim 2 or 3, or a metal channel member having a predetermined channel interval, wherein a thin metal plate or a metal net is fixed to a wall surface to be installed. An electromagnetic wave / sound absorbing structure body comprising the electromagnetic wave / sound absorbing structure body according to claim 10 or 11 attached thereto.   The electromagnetic wave / acoustic wave absorbing yarn according to claim 1 is wound and fixed in a Z direction and an S direction at a predetermined pitch on an outer peripheral surface of a plastic pipe having a predetermined inner diameter, and a metal rod is disposed inside the plastic pipe. Alternatively, an electromagnetic wave / sound absorbing structure comprising a metal pipe supported by caps fixed to both ends of the plastic pipe along a center line of the plastic pipe.   An electromagnetic wave / sound absorption structure comprising a plurality of the electromagnetic wave / sound absorption structures according to claim 14 arranged in parallel at a predetermined interval.

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