JP3209456B2 - Radio wave antireflective body and radio wave antireflection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave antireflection body and a radio wave antireflection method capable of preventing an obstacle due to radio waves, and having a reduced thickness and weight.

[0002]

2. Description of the Related Art Conventionally, a method of applying a conductive paint to a housing of an electronic device or a method of applying zinc, aluminum, iron, copper on a plastic substrate in order to avoid malfunction due to radio waves in an electronic device or the like. There is known a method of forming a metal thin film such as by plating, bonding, vapor deposition, and the like. However, the method of applying the conductive paint to the housing has a small radio wave shielding effect,
In addition, there is a disadvantage that the effect tends to decrease over time. Further, in the method of forming a metal thin film on a plastic base material, the amount of reflected radio waves is large, and there is a problem of obstacles due to secondary radio waves. Further, Japanese Patent Application Laid-Open No. 2-241098 describes an electromagnetic wave shielding film in which a geometric pattern is drawn on the surface of a film using a conductive metal, and this film has excellent electromagnetic wave shielding properties. However, any of these materials can effectively function as a shielding material for preventing leakage of electromagnetic waves generated from electronic devices or the like or preventing malfunction of electronic devices due to external electromagnetic waves. However, it does not work effectively to prevent radio interference such as a false image of a radar caused by reflection of a radio wave from a bridge, a building or the like.

As a means for preventing such obstacles due to the reflection of radio waves, a radio wave absorption material in which ferrite or a mixture of ferrite and metal powder or carbon powder is dispersed in an organic polymer is known. However, in order to obtain practical absorption characteristics with the above materials, even in the case of a radio wave of a narrow band frequency (effective band width of about 0.5 to less than 1 GHz), the weight is at least 4 kg / m ³ and the film thickness is 1 mm or more. 3. In the case of radio waves having an effective bandwidth of about 1 to 5 GHz, the weight is at least about 12 kg / m ³ or more.
A film thickness of 5 mm or more is required. Therefore, there are drawbacks in that the thickness and weight are large when used, and the workability is poor, and when the work is performed on a building or the like, consideration must be given to the strength and balance of the whole building. Therefore, there has been a demand for the development of a radio wave antireflection body having a thin film, light weight, good workability, and excellent radio wave shielding ability and radio wave reflection preventing ability.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on the radio wave antireflection body and the radio wave antireflection method in order to solve the above-mentioned problems. As a result, a spacer layer and a specific pattern were formed on a radio wave reflector such as metal. By sequentially forming a metal pattern layer in which units are arranged, radio waves are shielded,
The present inventors have found that they can exhibit excellent radio wave reflection preventing ability, and have completed the present invention.

The above effects of the present invention are quite difficult to predict from the prior art. That is, the features of the present invention are:
Surprisingly, by mounting a metal pattern layer in which a metal that acts as a reflector of radio waves in a specific shape and arranged on a structure with a specific configuration, it is surprisingly lightweight and thin It has been found that the reflection of radio waves can be effectively prevented also in the above. That is, the metal pattern layer alone acts almost as a radio wave reflector, and when there is no metal pattern layer, a thick ferrite film layer is required, which is similar to the conventional one and has a large weight. This has been solved by the present invention having the effects described above.

That is, the present invention may contain at least one kind of powder selected from a metal radio wave reflector layer (A), ferrite, carbon, metal powder, conductive metal oxide and high dielectric material. A spacer layer (B) consisting of one or more layers of an organic resin layer, a support layer (C) which may be interposed if necessary, and a multilayer formed by combining a plurality of strip-shaped metal figures so as not to contact each other. A structure having a structure in which a plurality of graphic units are arranged in such a manner that a plurality of graphic units are arranged so as not to be in contact with each other as a graphic unit. It provides the body.

Further, the present invention provides the above-mentioned radio wave anti-reflective body, wherein a clear or colored coating layer (E) is further provided on the pattern layer (D). Things.

Further, the present invention provides a radio wave anti-reflection method comprising forming the above-mentioned radio wave anti-reflection body on a structure.

Further, the present invention is characterized in that a radio wave reflection structure is formed on a radio wave reflection structure having a metal surface by removing the metal radio wave reflector layer (A) from the above radio wave antireflection body. It provides a prevention law.

In the radio wave antireflection body of the present invention, the metal radio wave reflector layer (A) is a metal layer capable of reflecting 100% or almost 100% (about 99% or more) of an incoming radio wave. Any metal sheet may be used. The metal sheet also includes a metal foil. Examples of the type of the metal sheet include sheets of metal such as tinplate, brass, duralumin, copper, iron, nickel, stainless steel, and aluminum. The thickness of the metal sheet is not particularly limited, but is preferably about 25 to 500 μm from the viewpoint of strength and weight reduction.

[0011]

In the radio wave antireflection body of the present invention, a spacer layer (B), a support layer (C) which may be interposed if necessary, and a metal pattern layer (D) are provided on the layer (A). It has a structure that is sequentially laminated.

The spacer layer (B) is composed of one or more organic resin layers which may contain at least one kind of powder selected from ferrite, carbon, metal powder, conductive metal oxide and high dielectric material. It becomes. This organic resin layer may be a pre-molded plastic sheet, or by dispersing the powder of the above ferrite or the like as necessary in an organic resin powder or an organic resin liquid dissolved or dispersed in a solvent as necessary. The composition can be obtained by molding the composition into a sheet or applying and drying the composition on a plastic sheet forming a part of the layer (A), the support layer (C) or the spacer layer. When molded into a sheet, paper, cloth, on a porous sheet such as nonwoven fabric, the organic resin liquid or a dispersion of powder in the resin liquid is applied, impregnated and molded. Often, molding can be carried out by applying pressure under heating. When molded into a sheet, this molded product can be bonded onto the layer (A) or the support layer (C) with an adhesive or the like.

The organic resin used for the organic resin layer includes, for example, polyimide, polyphenylene sulfide,
Rosin, shellac, ester rubber, hypalone (chlorosulfonated polyethylene) rubber, chloride rubber, chloroprene rubber, polyolefin resin, hydrocarbon resin, vinylidene chloride resin, polyamide resin, polyetherketone resin, vinyl chloride resin, polyester resin, alkyd resin And resins such as phenolic resins, epoxy resins, acrylic resins, urethane resins, silicone resins, cellulose resins, and vinyl acetate resins.

As the ferrite that can be dispersed in the resin, ferrite conventionally used in radio wave absorbers can be used. As a typical example, hematite (Fe ₂
O ₃ ), magnetite (Fe ₃ O ₄ ), generally MO
An iron oxide containing a dissimilar metal element represented by the composition e ₂ O ₃ (M is Mn, Co, Ni, Cu, Zn, Ba, Mg
Etc.). Although the particle size of the ferrite is not particularly limited, it is generally desirable that the particle size be 100 μm or less from the viewpoint of dispersibility and the like.

The carbon that can be dispersed in the resin is preferably carbon having conductivity, and examples thereof include so-called conductive carbon and carbon fiber. The particle size of the carbon or the diameter of the fiber is not particularly limited, but it is generally preferable that the particle size or the diameter of the fiber be 100 μm or less from the viewpoint of dispersibility and the like.

Examples of the metal powder that can be dispersed in the resin include metal powders such as gold, platinum, silver, copper, nickel, aluminum, and iron. Examples of the conductive metal oxide include tin oxide and tin oxide. Indium oxide can be used.
These may be particulate or fibrous, or may be formed in a thin film by vapor deposition or the like on a particulate or fibrous polymer powder or inorganic powder. The particle size of the metal powder and the conductive metal oxide or the diameter of the fiber is not particularly limited, but generally the particle size or the diameter of the fiber is preferably 100 μm or less from the viewpoint of dispersibility and the like.

Examples of the high dielectric material that can be dispersed in the resin include particles of barium titanate, strontium titanate, zirconium titanate, potassium titanate and the like, or titanate compounds such as whiskers;
Silicon carbide, silicon nitride, and the like can be given. These high-dielectric materials may be in the form of particles or fibers, and the particle size or fiber diameter is not particularly limited, but generally 100 μm or less in terms of dispersibility and the like. preferable.

In the above resin, at least one powder of the above ferrite, carbon, metal powder, conductive metal oxide and high dielectric material can be blended and dispersed singly or in combination. The amount of the powder to be added to 100 parts by weight of the resin is preferably within the following range. -In the case of ferrite alone, 400 parts by weight or less-In the case of any one of carbon, metal powder and conductive metal oxide alone or in combination of two or more of them, 20 parts by weight or less-High dielectric material alone 200 parts by weight or less, and in the case of combined use of ferrite / (at least one of carbon, metal powder, and conductive metal oxide), the total is 400 parts by weight or less, and (carbon, metal powder, conductive metal oxide) Oxide) is less than 20 parts by weight. In the case of combined use of ferrite and a high dielectric material, the total amount is 400 parts by weight or less, and the content of the high dielectric material is preferably of the total amount of these powders. Less than 50% by weight, (at least one of carbon, metal powder, and conductive metal oxide) / 2 in total when used in combination with a high dielectric material
Not more than 00 parts by weight, and the total amount of (carbon, metal powder, conductive metal oxide) is less than 20 parts by weight; ferrite / (at least one of carbon, metal powder, conductive metal oxide) / When used together with a high dielectric material, the total amount is 400 parts by weight or less, the total amount of (carbon, metal powder, conductive metal oxide) is less than 20 parts by weight, and the content of the high dielectric material is preferably Less than 50% by weight of the total amount.

In the present invention, the spacer layer (B) may be composed solely of an organic resin layer which may contain the above-mentioned powder of ferrite or the like. For example, a plastic film and a powder of ferrite or the like formed thereon may be used. And a multilayer such as a laminate of a plastic film and a combination with an organic resin layer containing the same. The thickness of the spacer layer (B) varies depending on the pattern shape of the layer (D), but is generally preferably in the range of 0.05 to 3 mm,
More preferably, it is in the range of 0.1 to 1.5 mm.

Although the function and effect of the spacer layer (B) are not clear, the path length of radio waves entering from the metal-free portion of the pattern layer (D) is changed and reflected by the layer (A). It is considered that the phase of the radio wave going out from the metal-free portion of (D) to the outside is changed, thereby changing the phase with the radio wave from the outside reflected by the metal portion of the pattern layer (D). This is considered to have the effect of eliminating the energy of the radio wave due to interference with the radio wave.

In the radio wave antireflection body of the present invention, the support layer (C) which may be interposed, if necessary, is generally a plastic sheet having a thickness of about 10 to 500 μm. The plastic sheet includes a plastic film. Although there is no particular limitation on the type of the plastic sheet, polyimide, polyester, polyvinyl chloride, polyvinylidene chloride, hypalon rubber, chloride rubber,
Chloroprene rubber, epoxy resin, acrylic resin, phenol resin and the like can be mentioned. The plastic sheet includes a fiber-reinforced plastic sheet.

In the radio wave reflection preventer of the present invention, a metal pattern layer (D) is laminated on the spacer layer (B) with or without a support layer (C). The metal pattern layer (D) may be formed directly on the spacer layer (B), or may be formed on the support layer (C) and then adhered to the spacer layer (B). As a method of forming a pattern in the metal pattern layer (D), a conventionally known method such as an etching method of etching a metal sheet to form a pattern, a pattern plating method, and a transfer method can be used.

As the etching method, for example, the layer (B)
Alternatively, a metal sheet is stuck on the layer (C), an etching resist layer is formed on the metal sheet by a photoresist method or a printing method, and an exposed metal portion where the resist layer is not formed is removed by etching. Method. As the transfer method, there is a method in which a metal pattern is formed on a transfer substrate in advance, and the pattern is transferred onto the layer (B) or the layer (C).

As the pattern plating method, for example, a resist layer having a pattern is formed on the layer (B) or the layer (C) coated with a plating catalyst such as platinum chloride by a photoresist method or a printing method, and then a non-coated resist layer is formed. After depositing a thin plating layer by electroless plating or the like on the layer (B) or layer (C) by depositing a metal only on the portion not covered with the resist by the electrolytic plating method, and then forming a photo on the plating layer. A resist layer having a pattern is formed by a resist method or a printing method, and then electroplating is performed, plating is further performed on a plating portion not covered with the resist to a required thickness, and then the resist is peeled off. There is a method of removing a thin plating layer formed by an electrolytic plating method by etching.

When the metal pattern layer (D) is formed on the support layer (C), the support layer (C) is adhered to the spacer layer (B) with an adhesive or the like, and the spacer layer (B) is adhered thereon. The pattern layer (D) may be formed, but after forming the pattern layer (D) on the support alone, the support having the obtained pattern layer (D) is adhered on the spacer layer (B). May be.

The types of metals forming the metal pattern layer (D) include platinum, gold, silver, nickel, chromium, and the like.
Examples include aluminum, copper, and iron. The thickness of the metal of the pattern layer is not particularly limited as long as it is equal to or greater than the so-called radio wave skin depth, but is preferably in the range of usually 0.5 to 50 μm from the viewpoint of strength and weight.

The shape of the metal pattern layer (D) is a shape formed by arranging a plurality of graphic units by using a multilayer structure formed by combining a plurality of strip-shaped metal figures so as not to contact each other as a graphic unit. Should be fine. Each strap-like metal figure in the figure unit is not particularly limited in shape as long as it is a strap-like shape, but has a width of 0.01 to 5 mm, an arithmetic mean of length and an arithmetic mean of width. ratio of 3: 1 to 10 ^6: is preferably in the 1 range. Further, the interval (space) between the straps of each figure in the figure unit is preferably 0.01 to 10 m.
m, more preferably in the range of 0.05 to 5 mm.
This interval may or may not be equal. Further, each figure may or may not be similar, but in terms of radio wave anti-reflection ability, it is preferable that the interval between laces in a figure unit be within the above-mentioned fixed range, This interval can be easily maintained within a certain range. Each figure may be a closed figure having no open end or an open figure having an open end.

The multilayer structure as a figure unit may have a multilayer structure, for example, a stripe shape, circles of different sizes are concentric, and similar polygons of different sizes are stacked on the same center in a plane. Are arranged. Usually, the size of the figure unit is preferably 1000 cm ² or less. FIGS. 1 to 11 show typical examples of the figure unit.

In the present invention, the figure unit is not limited to the illustrated shape and size. For example, FIG.
In, the number of layers is the size of the figure unit, the width of the strap,
It can be changed arbitrarily depending on the space between the ties. Further, the number of lines (string bands) of the line-shaped figure in FIG. 7 can be arbitrarily changed.

The above-mentioned figure units can be arranged to form a metal pattern layer (D). The arrangement of the figure units can be, for example, a checkerboard pattern, a stripe pattern, a grid pattern, or the like. Preferably, it is a pattern. It is preferable that the area ratio of the non-metal part / metal part on the surface on which the metal pattern layer (D) is formed is 0.05 to 20.

The radio wave reflection preventer of the present invention comprises the metal radio wave reflector layer (A), the spacer layer (B), the support layer (C) which may or may not be interposed, and the metal pattern layer (A). Although it may be composed of D), a clear or colored coating layer (on the pattern layer (D)) may be formed on the pattern layer (D) in order to improve the anti-corrosion property, weather resistance, aesthetics, retention of material properties, etc. E) may be provided by painting or the like. Examples of the resin species forming the coating layer include an epoxy resin, a urethane resin, an acrylic resin, and a polyester resin.

In the radio wave anti-reflection method of the present invention, the radio wave anti-reflection body of the present invention is adhered to a structure to be shielded and prevented from being reflected by an adhesive or the like. Can be effectively prevented from being reflected. Further, in the radio wave anti-reflection method of the present invention, when the structure to prevent radio wave reflection is a radio wave reflecting structure having a metal surface, this radio wave reflecting structure is the radio wave anti-reflection body of the present invention. Since the function of shielding radio waves and the like can be performed in the same manner as the metal radio wave reflector layer (A), the metal radio wave reflector layer (A) is formed on the radio wave reflection structure from the radio wave anti-reflection body. The formation of the removed laminate can also effectively prevent radio wave reflection.

Further, an adhesive is applied in advance to the surface of the radio wave antireflection body of the present invention on the side opposite to the layer (B) of the metal radio wave reflector layer (A), and a release paper is laminated thereon. Thus, the radio wave reflection preventive body can be formed on the structure simply by peeling off the release paper at the construction site and attaching it.

[0034]

The present invention will be described more specifically with reference to the following examples. Hereinafter, “parts” are based on weight.

Example 1 A coating containing 300 parts of barium-based ferrite with respect to 100 parts of an acrylic resin was applied on a 50 μm-thick polyimide film so that the dry film thickness was 400 μm.
A spacer layer (B) was formed. On another polyimide film [(C) layer: film thickness 50 μm], a thickness of 18 μm
1 is coated with a negative photoresist Sonne EDUV376 (manufactured by Kansai Paint Co., Ltd.) to a thickness of about 20 μm by an electrodeposition coating method.
Through a negative-type photomask in which the figure units (the outermost side length is about 12 mm, the line width of the strap is about 200 μm, and the space between the straps is about 200 μm) are arranged in a checkered pattern. And exposed to 100 mj / cm ² with an ultrahigh pressure mercury lamp, developed with 1% sodium carbonate water, and then removed the exposed copper with ferric chloride to form a metal pattern layer (D). A thermocompression-bonded sheet is interposed between the 50 μm-thick aluminum foil (A) and (B) layers and between the (C) and (D) layers.
It was press-bonded while being heated to 80 ° C. to produce an anti-reflection member.

Example 2 A mixture 105 of 100 parts of Epicoat 828 (bisphenol A type epoxy resin manufactured by Shell Chemical Co., Ltd.) and 5 parts of diethylenetriamine as a curing agent was placed on an aluminum foil [(A) layer] having a thickness of 50 μm. A coating containing 150 parts of nickel-based ferrite was applied to each part so that the dry film thickness became 500 μm, to form a spacer layer (B). On this (B) layer, a figure unit (the outermost cord band length is about 10 mm, line width is 100 μm, space is 100 μm) shown in FIG. Was formed by a transfer method to form an aluminum pattern layer (D) having a thickness of 25 μm, which was arranged so that each had a thickness of 3 mm.

Example 3 Six 150 μm-thick polyethylene terephthalate films were laminated and bonded to form a spacer layer (B). Separately, polyimide film [(C) layer: film thickness 50
[μm], and a copper foil having a thickness of 18 μm is adhered thereon, and using this, an etching method using an electrodeposition resist similar to that in Example 1 is used to form a graphic unit like the graphic unit shown in FIG. A copper pattern layer (D) in which lengths of 20 mm and line widths of 1 mm) were arranged so that the vertical, horizontal, and horizontal intervals between the graphic units were 3 mm, respectively. Further, on the layer (D), a two-component urethane tank rear coating layer having a dry film thickness of 50 μm was provided.
The obtained spacer layer (B) is adhered to an aluminum foil (A) layer having a thickness of 50 μm with an adhesive, and the (B) layer further has a (D) layer and a clear coating layer (C). The (C) layer surface of the layer was adhered with an adhesive to prepare an anti-reflective member for radio waves.

Example 4 In a case where a paint containing 5 parts of nickel powder and 70 parts of barium titanate powder with respect to 100 parts of acrylic resin was applied to a smooth metal surface on a polyimide nonwoven fabric having a thickness of about 120 μm. Apply so that the dry film thickness is 800 μm.
The spacer layer (B) was obtained by heating and pressing at 40 ° C. under a pressure of 200 kg / cm ² for 60 minutes. Separately, a polyimide film [(C) layer: film thickness of 50 μm] has a thickness of 1 μm.
8 .mu.m copper foil was adhered, and using this, an etching method using the
Figure unit (Figure 8) (Length of the longest side of the outer circumference is about 8 mm, line width is 200 μm, space is 100 μm)
Is a copper pattern layer (D) arranged as shown in FIG. 12 with the distance between vertices between each figure unit being 0.5 mm.
Was formed. An aluminum foil (A) layer having a thickness of 50 μm, the obtained (B) layer, and the (B) layer and the (C) layer having a pattern layer formed thereon are adhered with an adhesive to form an antireflection member for radio waves. Created.

Example 5 A coating containing 175 parts of barium-based ferrite and 25 parts of potassium titanate whiskers per 100 parts of an acrylic resin was applied on a polyimide film having a thickness of about 50 μm so that the dry film thickness became 350 μm. Thus, a spacer layer (B) was formed. Separately, a glass epoxy substrate to which a copper foil having a thickness of 18 μm is bonded [(C) layer: film thickness of 120
μm] and the same pattern unit as in Example 1 and a pattern unit like the pattern unit shown in FIG. 2 (the inner diameter of the outermost circle is A copper pattern layer (D) was formed by alternately arranging about 12 mm, an innermost circle having an inner diameter of about 0.5 mm, a line width of 300 μm, and a space of 200 μm) such that the shortest interval of the outermost circumference was 2 mm. An aluminum foil (A) layer having a thickness of 50 μm, the obtained (B) layer, and the (B) layer and the (C) layer having a pattern layer formed thereon are adhered with an adhesive to form an antireflection member for radio waves. Created.

Example 6 On a polyimide film having a thickness of about 50 μm, 150 parts of barium-based ferrite, 50 parts of strontium titanate powder, and 50 parts of barium sulfate powder were sputtered on an indium-tin film having a thickness of about 100 nm based on 100 parts of an acrylic resin. A spacer layer (B) was formed by applying and drying a paint containing 15 parts of a powder having an oxide coating thereon to a dry film thickness of 400 μm. 25 μm thick on this layer (B)
The aluminum foil of FIG. 11 was adhered, and this was used for etching by the same etching method using an electrodeposition resist as in Example 1.
(The distance between adjacent vertices on the outermost periphery is 10 mm, the line width is 300 μm, and the space is 200 μm.)
m) was formed into an aluminum pattern layer (D) arranged in a checkered pattern so that the distance between the four outermost acute vertices between the figure units was 0.5 mm. The duralumin foil (A) layer having a thickness of 50 μm and the obtained (D) layer having the (D) layer were adhered with an adhesive to prepare an anti-reflection member.

Example 7 In Example 1, the aluminum foil (A) layer was replaced with 300
A radio wave was conducted in the same manner as in Example 3 except that a structure having a metal surface, which was a steel column of mm × 300 mm × 1000 mm, was used, and a urethane tank rear coating layer having a thickness of 50 μm was further provided on the pattern layer (D). An anti-reflection structure was created.

COMPARATIVE EXAMPLE 1 A laminated body having a configuration in which the layer (A) was removed from the radio wave antireflective member of Example 2 was used as Comparative Example 1.

COMPARATIVE EXAMPLE 2 A paint containing 200 parts of barium-based ferrite with respect to 100 parts of an acrylic resin was applied on a polyimide film having a thickness of 50 μm and dried so as to have a dry film thickness of 3 mm. A ferrite-containing resin layer was formed, and this laminate was used as Comparative Example 2.

The anti-reflection effect of the anti-reflection member, anti-reflection structure and laminate (comparative example) obtained in Examples 1 to 7 and Comparative Examples 1 and 2 was measured by the following method. The results are shown in Table 1 below. Table 1 shows the weights of the radio wave antireflective members of Examples 1 to 6 and the laminates of Comparative Examples 1 and 2. Table 1 shows the weight of the laminate to be bonded to the steel column for Example 7.

Measurement method of radio wave reflection prevention effect A transmitting horn antenna and a receiving horn antenna are connected to an incident radio wave in an anechoic chamber in which a radio wave absorber having a radio reflectivity of 0.01% or less is attached to a wall of a room. Installed so that the angle with the reflected radio wave is 5 °, and 60 degrees from each antenna.
A metal reflector is placed at a distance of about cm, and the reflected signal is received by a receiving horn antenna, and its radio wave reflectance is set to 100%. Next, the measurement sample is placed in place of the metal reflection plate, and the maximum absorption frequency, the radio wave reflectance at the maximum absorption frequency, the effective absorption band (one around the maximum absorption frequency) %).

[0046]

[Table 1]

[0047]

As is clear from Examples 1 to 6 based on the present invention, the radio wave antireflection body of the present invention exhibits a very small radio wave reflectance even when the film thickness is thin and light, and is effective. The absorption band is also wide. The results of Comparative Example 1 show that the metal pattern layer (D) of the present invention alone has a very high radio wave reflectance and a small effect of absorbing radio waves, and the results of Comparative Example 2 show that the ferrite film alone has a low radio wave reflectance. To reduce the thickness, a film thickness is necessary, and the effective absorption band is narrow only with the ferrite film alone. From the above, in the radio wave anti-reflective body of the present invention, mutual unexpected wave interference or wave generation by the metal pattern layer (D), the spacer layer (B) and the metal radio wave reflector layer (A) is unexpected. It is considered that an excellent radio wave reflection prevention effect can be obtained by canceling out the energy. Further, in the seventh embodiment which is a method of the present invention in which a laminated plate excluding the metal radio wave reflector layer (A) of the radio wave anti-reflection body of the present invention is formed on a radio wave reflecting structure having a metal surface, good radio waves are obtained. Has an anti-reflection effect.

[Brief description of the drawings]

FIG. 1 is an example of a graphic unit constituting a metal pattern layer (D) of a radio wave antireflection body of the present invention.

FIG. 2 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave reflection preventer of the present invention.

FIG. 3 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 4 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 5 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 6 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 7 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 8 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 9 is an example of a graphic unit constituting the metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 10 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 11 is an example of a graphic unit constituting a metal pattern layer (D) of the radio wave antireflection body of the present invention.

FIG. 12 is an example of an arrangement pattern in a figure unit in a metal pattern layer (D) of the radio wave antireflection body of the present invention.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Naozumi Iwasawa 4-171-1, Higashiyawata, Hiratsuka-shi, Kanagawa Pref. Kansai Paint Co., Ltd. (56) References JP-A-4-163998 (JP, A) JP-A-3 JP-A-29398 (JP, A) JP-A-1-143297 (JP, A) JP-A-3-92003 (JP, A) JP-A-60-160617 (JP, U) Patent 175119 (JP, C2) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 9/00

Claims (6)

(57) [Claims] 1. A metal radio wave reflector layer (A) having a particle size of 10
0μm following ferrite, carbon, metal powder, conductive metal oxides and one layer or thickness consisting of multilayered organic resin layer containing at least one powder selected from a high dielectric material
Is a spacer unit (B) having a thickness of 0.05 to 3 mm , and a multilayer structure formed by combining a plurality of string- shaped metal figures so as not to contact each other. The thickness of the array is 0.5
An anti-reflective member for radio waves, having a structure in which a metal pattern layer (D) of about 50 μm is sequentially laminated. 2. A metal radio wave reflector layer (A), a spacer layer (B) having a thickness of 0.05 to 3 mm comprising one or more layers of an organic resin layer, and a plurality of cord bands. layered structure formed by combining so as not to contact the metal shapes together as a figure unit formed by arranging so as not to contact the figure type unit plurality mutually thickness metal pattern layer of 0.5 to 50 [mu] m ( A radio wave antireflection body having a structure in which D) is sequentially laminated. 3. A spacer layer (B) and a metal pattern layer
(D) and a support layer (C) interposed therebetween.
The radio wave antireflection body according to claim 1 or 2, wherein On 4. A patterned layer (D), further clear or colored coating layer Telecommunications antireflection body according to any one of claims of claims 1, characterized by comprising providing a (E) 3 wherein . 5. The structure according to claim 1, wherein
A radio wave antireflection method comprising forming the radio wave antireflection body according to any one of the above items . 6. On a radio wave reflecting structure having a metal surface,
A radio wave anti-reflection method comprising forming a laminate in which the metal radio wave reflector layer (A) is removed from the radio wave anti-reflective body according to any one of claims 1 to 4 .