JPH1174681A - Electromagnetic wave shielding optically transparent window material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable realization of a good electromagnetic wave shielding capability and a high field angle, by forming an antireflection coating made of a multilayered film of a high-refractive index transparent film and a low-refractive index transparent film on the surface of a transparent substrate located on the side opposite to the side of an electromagnetic wave source. SOLUTION: Two transparent substrates 2A and 2B are bonded and integrated by an adhesive resin 4 with a conductive mesh 3 provided between these substrates. On the surface of the transparent substrate 2A located on the side opposite to the side of an electromagnetic wave source, that is, on the surface which becomes the surface side of an equipment in the case where a window material 1 is used as a front filter of a PDP, an antireflection coating 5 made of a multilayered film of a high-refractive index transparent film 5A and a low-refractive index transparent film 5B is formed. This antireflection coating 5 is constituted by alternately stacking two layers of high-refractive index transparent films 5A and two layers of low-refractive index transparent films 5B, that is, four layers in total, for example in the order of the film 5A and the film 5B. Thus, good electromagnetic wave shielding property and light transmissiveness are provided, and the contents of a screen can be sufficiently visually confirmed even with respect to a lateral incident light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding light transmitting window material, and more particularly to an electromagnetic wave having good electromagnetic wave shielding and light transmitting properties, which is useful as a front filter of a plasma display panel (PDP). The present invention relates to a light transmitting window material having a shielding property.

[0002]

2. Description of the Related Art In recent years, with the spread of office automation equipment and communication equipment, electromagnetic waves generated from these equipment have become a problem. That is, there is a concern that the electromagnetic waves may affect the human body, and malfunctions of precision equipment due to the electromagnetic waves have become a problem.

Therefore, as a front filter of a PDP of an OA device, a window material having an electromagnetic wave shielding property and a light transmitting property has been conventionally developed and put to practical use. Such a window material is also used as a window material in a place where precision equipment is installed, such as a hospital or a laboratory, in order to protect precision equipment from electromagnetic waves such as mobile phones.

The conventional electromagnetic wave shielding light transmitting window material has a structure in which a conductive mesh material such as a wire mesh is interposed between transparent substrates such as an acrylic plate.

[0005]

However, in the conventional electromagnetic-shielding light-transmitting window material, the image is difficult to see due to the reflection of the light on the screen, the viewing angle is small, and the screen content is sufficient for incident light from the side. Had the drawback that it was not visually recognizable.

[0006] The present invention solves the above-mentioned conventional problems and provides a PD.
An object of the present invention is to provide an electromagnetic wave shielding light transmitting window material having good electromagnetic wave shielding performance and a high viewing angle, which is suitable as an electromagnetic wave shielding filter for P and the like.

[0007]

The electromagnetic shielding light transmitting window material of the present invention is an electromagnetic shielding light transmitting window formed by integrally bonding an adhesive resin with a conductive mesh interposed between two transparent substrates. The material is characterized in that an antireflection film composed of a laminated film of a high-refractive-index transparent film and a low-refractive-index transparent film is formed on the surface of the transparent substrate located on the side opposite to the electromagnetic wave generation source side.

According to the electromagnetic wave shielding light transmitting window material of the present invention, an antireflection coating comprising a laminated film of a high refractive index transparent film and a low refractive index transparent film is provided on the surface of a transparent substrate located on the side opposite to the electromagnetic wave generating source side. Since the film is formed, the reflection of light is prevented by the light interference effect of the antireflection film, so that the viewing angle can be increased.

By using a transparent conductive film as the high refractive index transparent film, excellent electromagnetic wave shielding properties can be obtained by the transparent conductive film and the conductive mesh.

In the present invention, the antireflection film is preferably a multilayer film in which high-refractive-index transparent films and low-refractive-index transparent films are alternately laminated.

Further, it is preferable to provide an anti-contamination film on the anti-reflection film.

Since the electromagnetic shielding light transmitting window material of the present invention has the conductive mesh interposed between the transparent substrates as described above, the scattering prevention effect at the time of breakage can be obtained.
High safety.

In the present invention, a transparent ethylene-vinyl acetate copolymer (EVA) is preferred as the adhesive resin.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electromagnetic wave shielding light transmitting window material of the present invention will be described below in detail with reference to the drawings.

FIG. 1A is a schematic sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material of the present invention.
FIG. 2B is an enlarged view of a portion B in FIG.

As shown in FIG. 1, an electromagnetic wave shielding light transmitting window material 1 of the present invention is obtained by joining and integrating two transparent substrates 2A and 2B with an adhesive resin 4 with a conductive mesh 3 interposed therebetween. When the window material 1 is used as a front filter of a PDP, the surface of the transparent substrate 2A located on the side opposite to the electromagnetic wave generation source, that is, the surface on the front side of the device, has a high refractive index transparent film 5A and a low refractive index. An anti-reflection film 5 made of a laminated film with the transparent film 5B is formed.

The constituent materials of the transparent substrates 2A and 2B include:
Glass, polyester, polyethylene terephthalate (PET), polybutylene terephthalate, polymethyl methacrylate (PMMA), acrylic plate, polycarbonate (PC), polystyrene, triacetate film, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene Vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane, and the like, preferably, glass, PET, PC, and PMMA.

The thickness of the transparent substrates 2A and 2B is appropriately determined according to the required characteristics (eg, strength and lightness) depending on the use of the obtained window material.
Range.

The transparent substrates 2A and 2B are not necessarily made of the same material. For example, when the front side only needs to be scratch-resistant or durable, as in the case of a PDP front filter, the front side may be used. Transparent substrate 2A having a thickness of 0.1 to 1
A glass plate of about 0 mm, and a transparent substrate 2B on the back side is made of PET film or PET having a thickness of about 1 μm to 10 mm.
A plate, an acrylic film or an acrylic plate, a polycarbonate film or a polycarbonate plate can also be used.

The antireflection film 5 formed on the front side of the transparent substrate 2A is a laminated film of a high refractive index transparent film 5A and a low refractive index transparent film 5B. In the example shown in the figure, the antireflection film 5 is composed of a high refractive index transparent film 5A, a low refractive index transparent film 5B, a high refractive index transparent film 5A, and a low refractive index transparent film 5B. It is a multilayer film in which four layers are stacked. The laminated structure of the high-refractive-index transparent film and the low-refractive-index transparent film of the antireflection film 5 may be the following in addition to the illustrated one.

(A) A high-refractive-index transparent film and a low-refractive-index transparent film are laminated in a total of two layers each. (B) In order of a medium-refractive-index transparent film / a high-refractive-index transparent film / a low-refractive-index transparent film. (C) three layers each of which is alternately laminated in the order of high refractive index transparent film / low refractive index transparent film, and a total of six layers. High refractive index transparent film 5A As ITO (tin indium oxide), ZnO, Al-doped ZnO, TiO
₂ , a thin film having a refractive index of 1.8 or more, preferably a transparent conductive thin film, such as SnO ₂ or ZrO, can be formed. Further, as the low refractive index transparent film 5B, SiO ₂ , MgF ₂ ,
A thin film made of a low-refractive-index material such as Al ₂ O _{3 having} a refractive index of 1.6 or less can be formed. These film thicknesses differ depending on the film configuration, film type, and center wavelength in order to reduce the reflectance in the visible light region due to light interference. However, in the case of a four-layer structure, the first layer on the transparent substrate side (high refractive index) Transparent film) is 5 to 50 nm,
The second layer (low-refractive-index transparent film) has a thickness of 5 to 50 nm, the third layer (high-refractive-index transparent film) has a thickness of about 50 to 100 nm, and the fourth layer (low-refractive-index transparent film) has a thickness of about 50 to 150 nm. Is done.

In this embodiment, an anti-contamination film 6 is further formed on such an anti-reflection film 5 to improve the anti-contamination resistance of the surface. In this case, the contamination prevention film 6 is made of a fluorine-based thin film, a silicon-based thin film, or the like and has a thickness of 1 to 1000 nm.
A thin film of the order is preferred.

In the electromagnetic wave shielding light transmitting window material of the present invention, the transparent substrate 2A on the front side is further hard-coated with a silicon-based material or the like, or a light-scattering material is kneaded in the hard-coat layer. However, anti-glare processing may be performed. In addition, the transparent substrate 2B on the back side has
Functionality can be enhanced by applying a heat ray reflective coat such as a metal thin film or a transparent conductive film.

The conductive mesh interposed between the transparent substrates 2A and 2B is preferably a metal mesh and / or a metal-coated organic fiber having a wire diameter of 1 μm to 1 mm and an aperture ratio of 50 to 90%. In this conductive mesh, the wire diameter is 1
If it exceeds mm, the aperture ratio will decrease or the electromagnetic wave shielding property will decrease, making it impossible to achieve both. If it is less than 1 μm, the strength as a mesh decreases, and handling becomes extremely difficult. If the aperture ratio exceeds 90%, it is difficult to maintain the shape as a mesh, and if it is less than 50%, the light transmittance is low, and the amount of light from the display is reduced. More preferable wire diameter is 10 to 500 μm, and aperture ratio is 6
0 to 90%.

The aperture ratio of the conductive mesh means the ratio of the area occupied by the openings in the projected area of the conductive mesh.

The metal of the metal fibers and the metal-coated organic fibers constituting the conductive mesh include copper, stainless steel, aluminum, nickel, titanium, tungsten, tin, lead, and the like.
Iron, silver, chromium, carbon or an alloy thereof, preferably copper, stainless steel, or aluminum is used.

As the organic material of the metal-coated organic fiber, polyester, nylon, vinylidene chloride, aramid, vinylon, cellulose and the like are used.

In the present invention, the adhesive resin 4 for bonding the transparent substrates 2A and 2B through the conductive mesh 3 includes:
Ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene- (meth) acrylic acid copolymer, ethylene-ethyl (meth) acrylate copolymer, ethylene-methyl (meth) acrylate copolymer Copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer, partially saponified ethylene-vinyl acetate copolymer, carboxylated ethylene-vinyl acetate copolymer, ethylene- (meth) acryl-maleic anhydride copolymer, Ethylene-vinyl acetate-
An ethylene-based copolymer such as a (meth) acrylate copolymer is mentioned ("(meth) acryl" indicates "acryl or methacryl"). In addition, polyvinyl butyral (PVB) resin, epoxy resin, acrylic resin, phenol resin, silicone resin, polyester resin, urethane resin, etc. can also be used, but the most balanced in terms of performance and ethylene-vinyl acetate is easy to use. It is a copolymer (EVA). Further, PVB resins used in laminated glass for automobiles are also suitable in terms of impact resistance, penetration resistance, adhesiveness, transparency and the like.

The PVB resin contains 70 to 95% by weight of a polyvinyl acetal unit, 1 to 15% by weight of a polyvinyl acetate unit, and has an average degree of polymerization of 200 to 3000, preferably 3 to 5%.
It is preferably from 00 to 2500, and the PVB resin is used as a resin composition containing a plasticizer.

Examples of the plasticizer for the PVB resin composition include organic plasticizers such as monobasic acid esters and polybasic acid esters, and phosphoric acid plasticizers.

The monobasic acid esters include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octylic acid, 2-ethylhexylic acid, pelargonic acid (n-
Esters obtained by the reaction of an organic acid such as nonylic acid) and decylic acid with triethylene glycol, and more preferably triethylene-di-2-ethylbutyrate and triethylene glycol-di-2-ethylhexo. Ethates, triethylene glycol-di-capronate, triethylene glycol-di-n-octoate and the like. Note that an ester of the above organic acid with tetraethylene glycol or tripropylene glycol can also be used.

As the polybasic acid ester plasticizer, for example, an ester of an organic acid such as adipic acid, sebacic acid, azelaic acid and a linear or branched alcohol having 4 to 8 carbon atoms is preferable, and more preferably. , Dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate and the like.

Examples of the phosphate plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate, and the like.

In the PVB resin composition, if the amount of the plasticizer is small, the film-forming property is reduced, and if the amount is large, the durability and the like under heat resistance are impaired. Therefore, the plasticizer is added in an amount of 5 to 100 parts by weight of the polyvinyl butyral resin. 50 parts by weight, preferably 10-4
0 parts by weight.

The PVB resin composition may further contain additives such as a stabilizer, an antioxidant, and an ultraviolet absorber for preventing deterioration.

The electromagnetic wave shielding light transmitting window material of the present invention comprises:
A resin such as EVA is mixed with a predetermined amount of a crosslinking agent for heat or light curing to form two sheets of an adhesive film, and a sheet having a conductive mesh interposed therebetween is used as a transparent substrate 2A. , 2B, deaerated under reduced pressure and heating, and pre-compressed, and then the adhesive layer is cured by heating or light irradiation to be integrated to easily produce.

The thickness of the adhesive layer formed by the conductive mesh 3 and the adhesive resin 4 varies depending on the use of the electromagnetic wave shielding light-transmitting window material and the like.
mm. Therefore, the adhesive film is formed to a thickness of 1 μm to 1 mm so as to obtain an adhesive layer having such a thickness.

Hereinafter, the adhesive layer according to the present invention will be described in more detail by exemplifying the case where EVA is used as the resin.

The EVA has a vinyl acetate content of 5 to 5
0% by weight, preferably 15-40% by weight is used. If the vinyl acetate content is less than 5% by weight, there is a problem in weather resistance and transparency, and if it exceeds 40% by weight, mechanical properties are remarkably deteriorated, film formation becomes difficult, and film mutual blocking occurs. .

When crosslinking by heating, an organic peroxide is suitable as the crosslinking agent, and is selected in consideration of sheet processing temperature, crosslinking temperature, storage stability and the like. Usable peroxides include, for example, 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-
Di (t-butylperoxy) hexane-3; di-t-butyl peroxide; t-butylcumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide Α, α'-
Bis (t-butylperoxyisopropyl) benzene;
n-butyl-4,4-bis (t-butylperoxy) valerate; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; 1,1- Bis (t-butylperoxy) -3,
3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide; tert-butylperoxyacetate; 2,5-dimethyl-2,5
-Bis (tert-butylperoxy) hexyne-3; 1,1
-Bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane; 1,1-bis (tert-butylperoxy) cyclohexane; methyl ethyl ketone peroxide; 2,5-dimethylhexyl-2,5-bisper Oxybenzoate; tertiary butyl hydroperoxide; p-menthane hydroperoxide; p-chlorobenzoyl peroxide; tertiary butyl peroxyisobutyrate; hydroxyheptyl peroxide; chlorohexanone peroxide. These peroxides are used alone or as a mixture of two or more, usually in a proportion of 10 parts by weight or less, preferably 0.1 to 10 parts by weight, based on 100 parts by weight of EVA.

The organic peroxide is usually extruded to EVA,
It is kneaded by a roll mill or the like, but may be dissolved in an organic solvent, a plasticizer, a vinyl monomer or the like, and added to the EVA film by an impregnation method.

In order to improve the physical properties of EVA (mechanical strength, optical properties, adhesion, weather resistance, whitening resistance, crosslinking speed, etc.), various acryloxy or methacryloxy and allyl group-containing compounds are added. be able to. As the compound used for this purpose, acrylic acid or methacrylic acid derivatives, for example, esters and amides thereof are the most common, and ester residues include methyl, ethyl, dodecyl, stearyl, lauryl and other alkyl groups, as well as cyclohexyl groups. , A tetrahydrofurfuryl group, an aminoethyl group, a 2-hydroxyethyl group, a 3-hydroxypropyl group, and a 3-chloro-2-hydroxypropyl group. Further, esters with polyfunctional alcohols such as ethylene glycol, triethylene glycol, polyethylene glycol, trimethylolpropane, and pentaerythritol can also be used. As the amide, diacetone acrylamide is typical.

More specifically, polyfunctional esters such as acrylic or methacrylic acid esters such as trimethylolpropane, pentaerythritol and glycerin, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl isophthalate, and maleate Allyl group-containing compounds, such as diallyl acid, are listed. These may be used alone or as a mixture of two or more.
0.1 to 2 parts by weight, preferably 0.5 to 0 parts by weight
To 5 parts by weight.

When EVA is crosslinked by light, a photosensitizer is used in an amount of usually 10 parts by weight or less, preferably 0.1 to 10 parts by weight, per 100 parts by weight of EVA instead of the above-mentioned peroxide.

In this case, usable photosensitizers include:
For example, benzoin, benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, 5-nitroacenaphthene, hexachlorocyclopentadiene, p-nitrodiphenyl, p-nitroaniline, 2,4,6-triene Nitroaniline, 1,2-benzanthraquinone, 3-methyl-1,3-diaza-
1,9-benzanthrone and the like;
Species can be used alone or in combination of two or more.

In this case, a silane coupling agent is used in combination as an accelerator. As the silane coupling agent, vinyltriethoxysilane, vinyltris (β
-Methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ
-Glycidoxypropyltriethoxysilane, β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N
-Β (aminoethyl) -γ-aminopropyltrimethoxysilane and the like.

These silane coupling agents are usually EV
One or more kinds are mixed and used at a ratio of 0.001 to 10 parts by weight, preferably 0.001 to 5 parts by weight with respect to 100 parts by weight of A.

The EVA adhesive layer according to the present invention may further contain a small amount of an ultraviolet absorber, an infrared absorber, an antioxidant, and a paint processing aid, and also adjusts the color of the filter itself. Colorants such as dyes and pigments,
Fillers such as carbon black, hydrophobic silica and calcium carbonate may be added in an appropriate amount.

Further, as means for improving the adhesiveness, means such as corona discharge treatment, low-temperature plasma treatment, electron beam irradiation, and ultraviolet light irradiation on the sheeted EVA adhesive film surface are also effective.

The EVA adhesive film according to the present invention comprises
It is manufactured by mixing VA and the above-mentioned additives, kneading them with an extruder, a roll, or the like, and then forming a sheet into a predetermined shape by a film forming method such as calender, roll, T-die extrusion, or inflation. During film formation, embossing is applied to prevent blocking and facilitate degassing during pressure bonding with a transparent substrate.

Such an electromagnetic wave shielding light transmitting window material of the present invention can be effectively used as a front filter of a PDP or a window material of a place where precision equipment is installed in a hospital or a laboratory.

[0052]

The present invention will be described more specifically below with reference to examples and comparative examples.

The adhesive films used in the examples and comparative examples were manufactured as follows. Production of Adhesive Film 100 parts by weight of ethylene-vinyl acetate copolymer (Ultracene 634 manufactured by Toyo Soda Co., Ltd .: vinyl acetate content: 26%, melt index: 4) was added to 100 parts by weight of 1,1-bis (t-butylperoxy) -3, 1 part by weight of 3,5-trimethylcyclohexane (Perhexa 3M manufactured by NOF Corporation), 0.1 part by weight of γ-methacryloxypropyltrimethoxysilane, 2 parts by weight of diallyl phthalate, and Sumisolve 130 (Sumitomo Chemical Industries, Ltd.) as an ultraviolet absorber And 0.5 parts by weight) were mixed with each other to prepare a double-sided embossed adhesive film having a thickness of 500 μm using a 40 mm extruder.

Examples 1 and 2 and Comparative Example 1 A glass plate having a thickness of 3.0 mm was used as the front-side transparent substrate 2A, and an antireflection film A or B shown in Table 2 on the surface of the transparent substrate (see Table 1 for details). Is formed (however, no antireflection film is used in Comparative Example 1), and a PET sheet having a thickness of 0.1 mm is used as the back transparent substrate 2B. The conductive mesh shown in Fig. 2 is interposed, and this is put in a rubber bag and vacuum degassed.
It was pre-compressed by heating at a temperature of 0 ° C. for 10 minutes. Thereafter, the pre-pressed body was placed in an oven, and heat-treated at 150 ° C. for 15 minutes, crosslinked and hardened, and integrated.

With respect to the obtained window material, 3
The electromagnetic wave shielding property, light transmittance, presence / absence of moire phenomenon, and visibility of the display screen at the time of incident light at 0 MHz to 300 MHz were examined. The results are shown in Table 2.

Electromagnetic Wave Shielding Attenuation of the electric field was measured using an EMI shield measuring device (MA8602B) manufactured by Anritsu Corporation in accordance with the KEC method (Kansai Electronic Industry Promotion Center). Sample size is 9
It was 0 mm x 110 mm. Light transmittance (%) The average visible light transmittance between 380 nm and 780 nm was determined using a visible ultraviolet light spectrometer (U-4000) manufactured by Hitachi. Moire phenomenon was observed. The device was set on a display, and whether or not interference fringes were generated on the screen was visually observed. Visibility of the display screen at the time of incident light The visibility of the screen contents at a position of 30 degrees in the opposite direction when an artificial light source or sunlight was incident from a direction of 30 degrees with respect to the perpendicular of the display screen was observed.

[0057]

[Table 1]

[0058]

[Table 2]

Table 2 shows that the present invention provides a good electromagnetic wave shielding light transmitting window material according to the present invention.

Comparative Example 1 without an anti-reflection film
Then, when the incident light was applied, the content of the screen could not be recognized on the opposite side due to the influence of the reflected light. On the other hand, in the case of Examples 1 and 2 in which the antireflection films were laminated, in the same test, the screen contents could be recognized without being affected by the reflected light.

[0061]

As described in detail above, the electromagnetic wave shielding light transmitting window material of the present invention has good electromagnetic wave shielding and light transmitting properties, and has a sufficient screen content with respect to incident light from the side. Can be visually recognized. Further, since the transparent substrate is firmly joined with the mounting resin, the transparent substrate is not broken and scattered at the time of impact, so that it is rich in safety and is extremely useful industrially as an electromagnetic wave shielding filter for PDP.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material of the present invention, and FIG. 1B is an enlarged view of a portion B in FIG. 1A. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic wave shielding light transmission window material 2A, 2B Transparent substrate 3 Conductive mesh 4 Adhesive resin 5 Antireflection film 5A High refractive index transparent film 5B Low refractive index transparent film 6 Pollution prevention film

Claims (5)

[Claims] 1. An electromagnetic wave shielding light transmitting window material which is joined and integrated with an adhesive resin with a conductive mesh interposed between two transparent substrates, wherein the transparent substrate located on the side opposite to the electromagnetic wave generation source side. On the surface,
An electromagnetic wave shielding light transmitting window material comprising an antireflection film formed of a laminated film of a high refractive index transparent film and a low refractive index transparent film. 2. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein the high refractive index transparent film is a transparent conductive film. 3. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein the antireflection film is a multilayer film in which high refractive index transparent films and low refractive index transparent films are alternately laminated. . 4. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein a contamination prevention film is provided on the antireflection film. 5. An electromagnetic wave shielding light transmitting window material according to claim 1, wherein said adhesive resin is an ethylene-vinyl acetate copolymer.