JP3480898B2 - Electromagnetic wave shielding film for display, electromagnetic wave shielding structure for display and display - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electromagnetic wave shielding adhesive film having an electromagnetic wave shielding property and an infrared ray shielding property generated from the front surface of a display such as CRT, PDP (plasma), liquid crystal, and EL, and an electromagnetic wave using the film. The present invention relates to a shield structure and a display.

[0002]

2. Description of the Related Art As the use of various electrical equipment and electronic equipment has increased in recent years, electromagnetic noise interference (Electr
Magnetic Interference (EMI) is also increasing. Noise is roughly divided into conduction noise and radiation noise. As a countermeasure against the conduction noise, there is a method using a noise filter or the like. On the other hand, as a measure against radiation noise, it is necessary to electromagnetically insulate the space,
Methods such as making the housing a metal body or a highly conductive body, inserting a metal plate between circuit boards, and winding a cable with a metal foil have been adopted. These methods can be expected to have an electromagnetic wave shielding effect for circuits and power supply blocks, but they are not suitable for electromagnetic wave shielding applications such as CRTs and PDPs that are generated from the front surface of a display because they are opaque.

As a method for achieving both electromagnetic wave shielding property and transparency, a method of depositing a metal or a metal oxide on a transparent substrate to form a thin film conductive layer (Japanese Patent Laid-Open No. 1-278080).
No. 0, and Japanese Patent Laid-Open No. 5-323101) are proposed. On the other hand, an electromagnetic wave shielding material in which a good conductive fiber is embedded in a transparent substrate (Japanese Patent Laid-Open No. 5-327274,
(See JP-A-5-269912) or an electromagnetic wave shield material obtained by directly printing a conductive resin containing metal powder or the like on a transparent substrate (JP-A-62-57297, JP-A-2-5).
2499), an electromagnetic wave shielding material in which a transparent resin layer is formed on a transparent substrate such as polycarbonate having a thickness of about 2 mm, and a copper mesh pattern is formed on the transparent resin layer by the electroless plating method (JP-A-5-283889). (See Japanese Patent Application No. 9-145076), and further, an electromagnetic wave shielding structure in which a plastic film with a copper foil and an adhesive film on which a geometrical figure is applied by a microlithography method are attached to a plastic plate (see Japanese Patent Application No. 9-145076). Proposed.

When the electromagnetic wave shielding structure is attached to a display, the electromagnetic wave shielding structure needs to be grounded by some method in order to reduce the leakage of electromagnetic waves and to exhibit a good shielding property. As a structure of the electromagnetic wave shielding structure for making a good connection with the external electrode for grounding, a conductive material such as a conductive tape is provided on the transparent conductive film stuck on both sides of the plastic plate or on the outer periphery of the plastic plate. A method of bringing them into close contact and connecting the transparent conductive film to the external electrode with low resistance (low impedance) (JP-A-9-149).
(See Japanese Patent Publication No. 3477752), a method is proposed in which a metal net is projected between two plastic plates, and the exposed portion of the metal net is sandwiched by a frame for external electrodes for grounding (see Japanese Patent Laid-Open No. 9-147752). ing.

[0005]

As a method for achieving both electromagnetic wave shielding properties and transparency, JP-A-1-278800 has been proposed.
Japanese Patent Laid-Open No. 5-323101 discloses a method of forming a thin film conductive layer by depositing a metal or a metal oxide on a transparent substrate. If it is 100 Å to 2,000 Å), the surface resistance of the conductive layer becomes too large, and even if it is attached to the display by the connection method with the external electrode for grounding disclosed in JP-A-9-149347, sufficient shielding performance is obtained. I couldn't get it. Electromagnetic wave shielding material in which a good conductive fiber is embedded in a transparent base material (Japanese Patent Laid-Open No. 5-327274, Japanese Patent Laid-Open No. 5-327274).
No. 269912), when the connection with an external electrode for grounding is made by the method disclosed in Japanese Patent Application Laid-Open No. 9-147752, the shield effect is sufficient, but the conductive material is used to prevent electromagnetic wave leakage. Since the fiber diameter necessary for the regular arrangement of the characteristic fibers is the thinnest and is 35 μm, which is too large, the fibers are visible (hereinafter referred to as visibility) and are not suitable for display applications. JP-A-6
In the case of the electromagnetic wave shielding material in which a conductive resin containing a metal powder or the like is directly printed on a transparent substrate as disclosed in JP-A-2-57297 and JP-A-2-52499, similarly, the line width is around 100 μm due to the limit of printing accuracy. Therefore, it is not suitable because the visibility is expressed. In addition, Japanese Patent Application No. 9-14
According to the method proposed in Japanese Patent No. 5076, it is possible to achieve both electromagnetic wave shielding property and transparency, but since it is a method in which a film is attached to a plastic plate, when connecting to an external electrode for grounding. In addition, since the plastic film and the adhesive layer are insulating layers, it was difficult to directly ground them. On the other hand, for example, even if the film is attached so that the conductive material drawn in a geometrical shape is on the opposite side of the plastic plate, the geometrical figure is also drawn in the part in contact with the external electrode for grounding. As a result, the contact area between the conductive material forming the geometrical figure and the external electrode is small, and good shielding properties cannot be obtained. Regarding the shielding property of the electromagnetic waves generated from the front surface of the display, in addition to the electromagnetic wave shielding function of 30 dB or more at 30 MHz to 1 GHz, the infrared rays of 900 to 1, 100 nm generated from the front surface of the display can be controlled by other VTR devices controlled by remote control. This has an adverse effect and must be shielded. In addition to having a large visible light transmittance (visible light transmittance), it is necessary to properly connect the external electrode for grounding and the electromagnetic wave shielding structure in order to prevent leakage of electromagnetic waves. However, there has not been obtained a material that sufficiently satisfies the electromagnetic wave shielding property, the infrared ray shielding property, and the transparency / non-visibility properties at the same time. In view of such a point, the present invention has an electromagnetic wave shielding adhesive film having high electromagnetic wave shielding property, infrared ray shielding property, transparency and non-visibility by making a good connection with an external electrode for grounding, and an electromagnetic wave shielding film using the same. An object is to provide a structure and a display.

[0006]

The invention according to claim 1 of the present invention is directed to a plastic film, an adhesive layer provided on the plastic film, and a conductive material adhered on the adhesive layer. In the electromagnetic wave shielding film for displays consisting of geometric figures drawn from metal foil,
The metal foil of the conductive material has a roughened bonding surface to the adhesive layer, and the geometrical figure is the metal foil drawn by a chemical etching process and has a line width of 40 μm or less. A line interval is 100 μm or more and a line thickness is 40 μm or less, and a conductive frame portion electrically connected to the geometric figure is provided on the outer periphery of the geometric figure, and the adhesive layer is It is one that flows by heating or pressurization, and has a surface roughened by transferring a roughened shape by adhesion with the metal foil, and further,
On the roughened surface of the geometric figure and the adhesive layer
An electromagnetic wave shielding film for a display, comprising a transparent layer adhered by heating or pressing . The invention according to claim 2 provides the geometrical figure and the geometrical figure.
The frame part is chemically etched on the bonded metal foil.
The geometrical shape is electrically connected to the outer periphery by the process
It is characterized in that it is formed by leaving the frame portion . The invention according to claim 3 is characterized in that at least a part of a conductive frame portion electrically connected to the geometrical figure formed on the metal foil is exposed. The invention according to claim 4 is the gold of the conductive material.
Conductivity electrically connected to geometric figures formed on metal foil
The width of the frame portion is 1 to 40 mm .

According to a fifth aspect of the present invention, the conductive material is copper, and at least the surface of the metal foil is blackened. In the invention according to claim 6, the plastic film is polyethylene tere
With phthalate film or polycarbonate film
It is characterized in that. The invention according to claim 7, the metal foil of the conductive material, the thickness 0.5~40μ
m of copper, aluminum or nickel . The invention described in claim 8 is characterized in that pressure is applied when a transparent layer is provided on the geometrical figure. The invention according to claim 9 is transparent through another adhesive layer in the portion of the geometrical figure.
It is characterized in that a layer is provided . According to a tenth aspect of the present invention, there is provided an electromagnetic wave shielding property for a display as described above.
Infrared absorber is contained in one of the layers that make up the film.
It is characterized by being.

The invention according to claim 11 relates to claims 1 to 1.
10. The electromagnetic wave shield for display according to any one of 10
Rudder film and plastic plate, plastic film
A display battery made by stacking and pressing glass or glass plates
It is a magnetic wave shielding structure . A twelfth aspect of the present invention provides a plastic film and a plastic film provided on the plastic film.
Glued adhesive layer and conductive material adhered on the adhesive layer
Display consisting of geometric figures drawn from metal foil of
For displays with electromagnetic wave shielding film for a
In an electromagnetic wave shielding structure, a metal foil of the conductive material
Has a roughened bonding surface to the adhesive layer,
Geometric figures are made by chemically etching the metal foil.
Which was drawn by the scan line width is 40μm or less, the line interval is 100μm or more, der line thickness 40μm or less
Ri, and the are provided with a frame portion outer periphery of the geometric shapes and electrically connected to the conductive geometric shapes, the adhesive layer is intended to flow by heating or pressurization, and,
Wherein the adhesive has a surface roughened shape is roughened is transferred by the metal foil, further, the geometrical figure and the
Bonding by heat or pressure on the roughened surface of the adhesive layer
, Plastic plate, plastic film or glass
Disp with a transparent layer made of a transparent plate
It is an electromagnetic wave shielding structure for rays . According to a thirteenth aspect of the present invention , the frame portion is further connected to the peripheral portion of the electromagnetic wave shielding structure.
A frame is provided so as to

[0009] The invention according to claim 14, claim 1
10. The electromagnetic wave shield for display according to any one of 10
Do not press the rubbing film on the display surface.
A display having an electromagnetic wave shielding film
It The invention according to claim 15 provides a plastic film , an adhesive layer provided on the plastic film, and
Drawn from a metal foil of conductive material glued onto the adhesive layer
In a display having an electromagnetic wave shielding film for a display , which is composed of
The metal foil of the material has a roughened bonding surface to the adhesive layer.
And the geometric figure is a chemical etch of the metal foil.
It was drawn by the ching process, and the line width is 40 μm.
Below, the line interval is 100 μm or more and the line thickness is 40 μm.
μm or less, and you are provided a frame portion of the geometric shapes and electrically connected to the conductive outer circumference of the geometric figures
Ri, the adhesive layer is intended to flow by heating or pressing, and the adhesive has a surface roughened shape is roughened is transferred by the said metal foil, further, the geometric
Rough surface and display of geometrical figures and said adhesive layer
Characterized by being adhered to the surface by heat or pressure
Display.

[0010]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. Examples of the plastic film used in the present invention include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate, polyolefins such as polyethylene, polypropylene, polystyrene and EVA, vinyl resins such as polyvinyl chloride and polyvinylidene chloride, and polysulfone. A film made of a plastic such as polyether sulfone, polycarbonate, polyamide, polyimide, or acrylic resin, having a total visible light transmittance of 70% or more and a thickness of 1 mm or less is preferable. These can be used as a single layer, but can also be used as a multilayer film in which two or more layers are combined. Among the plastic films, a polyethylene terephthalate film or a polycarbonate film is preferable from the viewpoints of transparency, heat resistance, handleability, and price. The plastic film thickness is more preferably 5 to 500 μm.
If it is less than 5 μm, the handleability is deteriorated, and if it exceeds 500 μm, the visible light transmittance is lowered. 10-200μ
More preferably, it is m.

The plastic plate used in the present invention is a plate made of plastic, specifically, polystyrene resin, acrylic resin, polymethylmethacrylate resin,
Polycarbonate resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyethylene resin, polypropylene resin, polyamide resin, polyamideimide resin, polyetherimide resin, polyetherketone resin, polyarylate resin, polyacetal resin, polybutylene terephthalate resin, polyethylene terephthalate Thermoplastic polyester resin such as resin, cellulose acetate resin, fluororesin, polysulfone resin, polyethersulfone resin,
Examples thereof include thermoplastic resins and thermosetting resins such as polymethylpentene resin, polyurethane resin and diallyl phthalate resin. Among these, polystyrene resin, acrylic resin, polymethylmethacrylate resin, polycarbonate resin, polyvinyl chloride resin, polyethylene terephthalate resin, and polymethylpentene resin, which are excellent in transparency, are preferably used. The thickness of the plastic plate used in the present invention is 0.5 mm to 5 mm for protection and strength of the display,
It is preferable in terms of handleability.

As the conductive metal of the present invention, a metal such as copper, aluminum, nickel, iron, gold, silver, stainless steel, tungsten, chromium and titanium, or an alloy in which two or more kinds of metals are combined can be used. . Copper, aluminum, or nickel is suitable in terms of conductivity, ease of circuit processing, and price. Metal foil with a thickness of 0.5 to 40 μm, plated metal, or metal formed under vacuum such as vapor deposition is used. Be seen. If the thickness exceeds 40 μm, it is difficult to form a thin line width or the viewing angle becomes narrow. On the other hand, if the thickness is less than 0.5 μm, the surface resistance becomes large and the electromagnetic wave shielding effect tends to be poor.

It is preferable that the conductive metal is copper, and at least the surface of the conductive metal is blackened, because the contrast is increased. In addition, it is possible to prevent the conductive metal from being oxidized and discolored over time. The blackening treatment may be carried out before and after the formation of the geometrical figure, but after the formation, it can be carried out by a method generally used in the field of printed wiring boards. For example, sodium chlorite (31 g / l), sodium hydroxide (15 g / l), trisodium phosphate (12
It can be carried out by treating in an aqueous solution of g / l) at 95 ° C. for 2 minutes. Further, it is preferable that the conductive metal is a paramagnetic metal because of its excellent magnetic field shielding property. The simplest method for bringing the conductive metal into close contact with the plastic film is to stick the conductive metal through an adhesive layer containing acrylic or epoxy resin as a main component and flowing by heat or pressure. When it is necessary to reduce the thickness of the conductive layer of the conductive metal, one or more of thin film forming techniques such as vacuum deposition method, sputtering method, ion plate method, chemical vapor deposition method and electroless / electroplating method are used. This can be achieved by combining the methods. The thickness of the conductive metal is preferably 40 μm or less, and the thinner the thickness, the wider the viewing angle of the display, which is preferable as the electromagnetic wave shielding material, and more preferably 18 μm or less.

The geometric figures drawn by the conductive metal of the present invention include triangles such as equilateral triangles, isosceles triangles and right triangles, squares, rectangles, rhombuses, quadrilaterals such as parallelograms and trapezoids, and (regular) hexagons. It is a pattern that combines (regular) n-gons (n is a positive integer) such as polygons, (regular) octagons, (regular) dodecagons, (regular) decagons, circles, ellipses, and stars. ,
These units can be used alone or in combination of two or more. The triangle is most effective from the viewpoint of electromagnetic wave shielding property, but from the viewpoint of visible light transparency, the aperture ratio increases as the n number of the (positive) n-sided polygon increases with the same line width. From this point, the aperture ratio is preferably 50% or more. Aperture ratio is 60%
The above is more preferable. The aperture ratio is the percentage of the ratio of the effective area of the electromagnetic wave shielding adhesive film to the effective area minus the area of the conductive metal of the geometric figure drawn with the conductive metal. When the area of the display screen is taken as the effective area of the electromagnetic wave shielding adhesive film, it becomes the ratio at which the screen can be seen.

As a method of forming such a geometrical figure, it is effective to produce a plastic film with a conductive metal by a microlithography method from the viewpoint of accuracy of circuit processing and efficiency of circuit processing. The microlithographic method includes a photolithographic method, an X-ray lithographic method, an electron beam lithographic method, an ion beam lithographic method, and the like, and also includes a screen printing method and the like. Among these, the photolithographic method is the most efficient in terms of its simplicity and mass productivity. Among them, the photolithographic method using the chemical etching method is the most preferable in terms of its simplicity, economy, circuit processing accuracy, and the like. In the photolithography method, in addition to the chemical etching method, a method by electroless plating or electroplating, or a combination of electroless plating or electroplating and a chemical etching method can be used to form a geometric figure.

The line width of such a geometrical figure is 40 μm.
m or less, line spacing is 100 μm or more, line thickness is 4
The range is preferably 0 μm or less. From the viewpoint of non-visibility of geometric figures, the line width is more preferably 25 μm or less, and the line spacing is more preferably 120 μm or more and the line thickness 18 μm or less from the viewpoint of visible light transmittance. Line width is 40μ
m or less, preferably 25 μm or less, and when it is too small and thin, the surface resistance becomes too large and the shielding effect is deteriorated, so 1 μm or more is preferable. Line thickness is 4
0 μm or less is preferable, and if the thickness is too thin, the surface resistance will be too high and the shielding effect will be poor, so 0.5 μm
The above is preferable, and 1 μm or more is further preferable.
The larger the line interval, the higher the aperture ratio and the visible light transmittance. When used on the front surface of the display as described above, the aperture ratio is preferably 50% or more, more preferably 60% or more. If the line spacing becomes too large,
The line spacing is 100 because the electromagnetic wave shielding property deteriorates.
It is preferably 0 μm (1 mm) or less. When the line spacing becomes complicated due to a combination of geometric figures, the area is converted into a square area based on the repeating unit, and the length of one side is defined as the line spacing.

The adhesive to be the adhesive layer used in the present invention is
The following are typical ones. It is preferable that this adhesive layer is one that flows by heat or pressure and has an adhesive function. The electromagnetic wave shielding adhesive film of the present invention has an adhesive layer on a plastic film, on which a geometrical figure drawn by a conductive metal is formed. The adhesive layer is formed by adhering a geometrical figure drawn with a plastic film and a conductive metal, and when further adhering it to an adherend such as a display, a plastic plate, a plastic film or a glass plate, the adhesive layer , Flow through a space in which no geometrical figure is formed and adhere to the adherend. For this reason, the adhesive layer is preferably fluidized by heating or pressing. In addition, when the conductive metal adhesion surface is roughened to form a geometric figure and improve adhesion, this roughened surface is transferred to the adhesive layer, and light is diffusely reflected on the roughened surface. However, when the adhesive layer flows, the transfer shape of the roughened surface is eliminated by the flow, and the light transmittance can be improved. From these things, the adhesive layer is heated,
It is necessary to flow under pressure, and an adhesive composition such as a thermoplastic, thermosetting or actinic ray curable resin is preferable.

As these adhesives, bisphenol A is used.
Type epoxy resin, bisphenol F type epoxy resin, tetrahydroxyphenylmethane type epoxy resin, novolac type epoxy resin, resorcin type epoxy resin, polyalcohol / polyglycol type epoxy resin, polyolefin type epoxy resin, alicyclic and halogenated bisphenol, etc. Epoxy resin can be used. Other than epoxy resin, natural rubber, polyisoprene, poly-
1,2-butadiene, polyisobutene, polybutene, poly-2-heptyl-1,3-butadiene, poly-2-t
-(Di) enes such as butyl-1,3-butadiene, poly-1,3-butadiene, polyethers such as polyoxyethylene, polyoxypropylene, polyvinyl ethyl ether, polyvinyl hexyl ether, polyvinyl butyl ether, polyvinyl acetate , Polyesters such as polyvinyl propionate, polyurethane,
Examples thereof include ethyl cellulose, polyvinyl chloride, polyacrylonitrile, polymethacrylonitrile, polysulfone, polysulfide, and phenoxy resin.
These exhibit suitable visible light transmittance.

Examples of the curing agent for the adhesive include amines such as triethylenetetramine, xylenediamine and diaminodiphenylmethane, and acids such as phthalic anhydride, maleic anhydride, dodecylsuccinic anhydride, pyromellitic anhydride and benzophenonetetracarboxylic acid anhydride. Anhydride, diaminodiphenyl sulfone, tris (dimethylaminomethyl) phenol, polyamide resin, dicyandiamide, alkyl-substituted imidazole and the like can be used. These may be used alone or in combination of two or more.
Also, it may not be used. These curing agents (crosslinking agents)
Is 0.1 to 100 parts by weight of the above polymer.
It is preferable to select 50 parts by weight, preferably 1 to 30 parts by weight. If this amount is less than 0.1 part by weight, curing will be insufficient, and if it exceeds 50 parts by weight, excessive crosslinking will occur.
Adhesiveness may be adversely affected. If necessary, the adhesive used in the present invention may be mixed with additives such as a diluent, a plasticizer, an antioxidant, an ultraviolet absorber, a filler and a tackifier. Then, this adhesive layer is applied to the surface of the plastic film to bond the conductive metal to form a plastic film with a conductive metal.

The conductive frame portion in the present invention is on the same surface as the geometrical figure drawn by the conductive metal, and is formed in a frame shape on the outer periphery of the geometrical figure by the conductive material. . The frame portion is electrically connected to the geometrical figure drawn by the conductive material, and is well connected to the external electrode for grounding. A plan view of the electromagnetic wave shielding adhesive film of the present invention is shown in FIG. A conductive frame portion (1) is formed on the outer periphery of a geometrical figure (2) drawn with a conductive metal. The structure of the electromagnetic wave shielding adhesive film will be exemplified below with a cross-sectional view of the electromagnetic wave shielding adhesive film.
As shown in FIG. 1 (b), the constitution of the electromagnetic wave shielding adhesive film is such that a geometrical figure (2) drawn on the plastic film (3) with a conductive metal through the adhesive layer (4).
Is formed, and a conductive frame portion (1) is formed on the outer periphery thereof. Further, as shown in FIG. 1 (c), a geometrical figure (2) drawn by a conductive metal is formed on a plastic film (3) through an adhesive layer (4), and a conductive pattern is formed on the outer periphery thereof. The frame portion (1) is exposed. The structure in which the frame part (1) is exposed can be formed by removing a part or all of the adhesive layer or the plastic film supporting the frame part of the electromagnetic wave shielding adhesive film. As a method for removing a part or all of the adhesive layer or the plastic film, it can be easily performed by using laser or sandblast through a shielding jig. In the case of a laser, the shielding jig is a metal plate processed to provide a penetrating portion in the shape of the frame portion, and the penetrating portion is placed on the plastic surface of the electromagnetic shielding adhesive film in accordance with the formation position of the frame portion, A metal plate is used as a laser shield.
On the other hand, also in the case of sandblasting, rubber, photoresist, etc., which are wear resistant materials, are used as a shield in the same manner.
In order to form the conductive frame portion (1), a metal foil, a conductive tape, and a conductive three-dimensional mesh structure forming the frame portion are provided around the geometrical figure drawn with the conductive metal. It can also be performed by providing. The electrical connection between the conductive metal of the geometrical figure and the frame is performed by using the adhesive layer of the electromagnetic wave shielding adhesive film to bond the metal foil, etc. Connection may be made by contact with a figure, or connection may be made by applying a solder paste to a geometric figure of a metal foil or a conductive metal and heating and melting. Alternatively, a conductive adhesive may be used for adhesion.

In FIG. 1 (d), a geometrical figure (2) drawn by a conductive metal is formed on a plastic film (3) through an adhesive layer (4), and a conductive metal is attached to the outer periphery thereof. A conductive frame part (1) is formed of a conductive metal of a plastic film, and further, a transparent layer (5) is attached via an adhesive layer so that the transparent frame (5) does not cover the whole frame part on the geometrical figure. An example is shown in which the frame portion is exposed. The transparent layer (5) is a plastic film, a plastic plate, a glass plate, or the like, and in this configuration, it can be installed directly on the display or via a jig. Figure 1
(E) is an example in which the conductive frame portion (1) is bent to the plastic film (3) side to expose the frame portion to the plastic film side. In FIG. 1 (f), a geometrical figure (2) drawn by a conductive metal is formed on a plastic film (3) via an adhesive layer (4), and a conductive adhesive or a conductive tape is formed on the outer periphery thereof. In this example, the frame portion (1) is formed of a conductive material (6) such as. FIG. 1 (g) shows that a geometrical figure (2) drawn by a conductive metal is formed on a plastic film (3) through an adhesive layer (4), and a conductive three-dimensional mesh structure is formed on the outer periphery thereof. (7) by the frame part (1)
It is an example of forming. Examples of the electromagnetic wave shielding adhesive film of the present invention are shown in FIGS. 1A to 1G, but the present invention is not limited to these configurations. In the configuration of FIG. 1B, since the conductive metal forming the frame portion is connected to the conductive metal of the geometrical figure, the connection resistance with the external electrode for grounding is low and the good electromagnetic wave shielding property is obtained. Can be expressed. In the configuration of FIG. 1B, when the surface of the geometrical figure drawn by the conductive metal is attached to the plastic plate by using the adhesive layer, the adhesive layer or the plastic layer under the frame part Since the film serves as an insulating layer, it becomes difficult to electrically connect with an external electrode for grounding. The solution to this is the configuration shown in Fig. 1 (e). When the surface of the geometrical figure (2) drawn with a conductive metal is attached to a plastic plate, the frame part is bent, so There is a frame portion that serves as an electrode for grounding, which facilitates electrical connection. As for the method of bending, it may be bent as it is, but since the four corners become bulky, it is preferable to make notches at the four corners and then to bend. Alternatively, the bent portion may be fixed by, for example, attaching a double-sided adhesive tape to the plastic film in the portion where the frame portion is formed. On the other hand, similarly, in the configuration of FIG. 1 (c), when the surface of the geometrical figure (2) drawn by the conductive metal is attached to the plastic plate, the frame portion is exposed, and thus the external electrode for grounding is formed. It becomes easy to electrically connect with. In the configuration shown in FIG. 1D, when the plastic film (3) side is attached to a display or a plastic plate, the geometrical pattern as the outer layer is protected by the transparent layer (5) and the outer electrode for grounding is protected. The frame is exposed for easy connection. The laminated plastic film (3) or transparent layer (5) may be provided with an infrared shielding function, an antiglare function, and an antireflection function. In the configurations of FIGS. 1F and 1G, in order to reduce the connection resistance between the geometrical figure and the external electrode for grounding, a conductive material such as a conductive adhesive or a conductive tape (6) or Since the conductive frame part (1) is formed on the conductive metal of the geometrical figure by the conductive three-dimensional network structure (7), the size of the equipment to be used is not restricted and it is easy. A frame portion can be formed. With this configuration, the frame portion can be bent as shown in FIG. The width of the frame portion described above is preferably 1 to 40 mm in order to improve the connection with the external electrode for grounding. If it exceeds 20 mm, the width of the frame portion becomes too wide and the occupied area becomes large, so that it is preferably 5 to 15 mm. In the case of bending as shown in FIG. 1 (e), the width of the frame portion can be made wider.

The electromagnetic wave shielding structure of the present invention has a structure in which the electromagnetic wave shielding adhesive film having the structure shown in FIGS. 1A to 1G is provided on at least one surface of a plastic plate. Also, an electromagnetic wave shielding adhesive film is provided on a plastic plate with a surface on which a conductive geometric figure is drawn via an adhesive layer and a plastic film on the other surface via an adhesive layer. Is. Such an electromagnetic wave shielding structure is preferably brought into contact with an external electrode for grounding in order to suppress electromagnetic wave leakage and obtain good electromagnetic wave shielding properties. If the connection resistance between the external electrode for grounding and the electromagnetic wave shielding structure is high or the adhesion is insufficient, sufficient electromagnetic wave shielding properties cannot be obtained.

A perspective view of the electromagnetic wave shielding structure according to the present invention is shown in FIG. This is a configuration example in which an electromagnetic wave shielding adhesive film (8) is attached to one surface of a plastic plate (11) and a plastic film (13) is attached to the other surface of the plastic plate (11) via an adhesive layer (12).
2B to 2E are sectional views of this electromagnetic wave shielding structure. The structure of FIG. 2 (b) has a plastic plate (11).
The surface on which the geometrical figure of the electromagnetic wave shielding adhesive film (8) is drawn is bonded to one surface of the above, and the plastic film (13) is bonded to the other surface via the adhesive layer (12). In the configuration of FIG. 2 (c), the plastic film (3) side of the electromagnetic wave shielding adhesive film (8) is attached to one side of the plastic plate (11) via the adhesive layer (12) to form the plastic plate (11). Adhesive layer (1
A plastic film (13) is attached via 2). When the electromagnetic wave shielding structure is brought into contact with an external electrode for grounding, in order to improve the adhesion between the electromagnetic wave shielding structure and the external electrode for grounding, a conductive tape or a conductive three-dimensional mesh structure, etc. It is preferable that the cushioning conductive material (6) is formed on the frame portion of the electromagnetic wave shielding structure (FIGS. 2D and 2E). FIG. 3 is an example in which a conductive frame body (21) is provided in the frame portion of the electromagnetic wave shielding structure illustrated in FIG. The frame body (21) connects the conductive frame portion (1) electrically connected to the geometrical figure (2) drawn by the conductive metal and the external electrode for grounding, and has a beautiful appearance. Improve. In order to connect with external electrodes, the surface of the frame needs to be conductive, and metal such as aluminum and brass, or the necessary parts of plastics are plated, or plastics are covered with metal powder, conductive short A material in which a conductive material such as fiber is dispersed may be used. It is preferable that the frame body has a U-shaped cross section because it can be fitted and fixed in the electromagnetic wave shielding structure. Fixed is
The restoring force due to the deformation of the frame may be used, or screws, screws, and adhesives may be used. If the cross section of the frame is "U" shaped, insert a metal foil such as copper foil inside the concave part of the frame and fit it on the outer periphery of the geometric figure drawn on the whole surface with conductive metal. It is preferable because the metal foil of the frame and the geometrical figure can be pressed against each other. In this case, the metal foil that is in contact with the geometrical figure becomes the frame portion.

FIG. 3 (a) is a perspective view when the frame body (21) is provided on the electromagnetic wave shielding structure, and FIGS.
(G) is the sectional drawing. FIG. 3A shows an electromagnetic wave shielding structure in which a frame body (21) is fitted and fixed to a conductive frame portion provided on the outer periphery of an electromagnetic wave shielding adhesive film. FIG. 3B shows a frame body (21) on the entire exposed frame portion.
(C) is an example in which the frame body (21) is fitted in and contacted with a part of the frame portion. Figure 3
(D) is a configuration in which the frame body (21) is formed in an “L” shape, and the frame body is provided only on the frame portion of the electromagnetic wave shielding adhesive film and the end portion side surface of the plastic plate. If there is not enough contact between the frame and the conductive part of the frame, put a metal powder that is a little harder than the frame or frame on the conductive frame and let the metal powder bite into the frame or frame. It is also effective to increase the certainty of contact conduction. The side surface of the end of the plastic plate and the frame were fixed with an adhesive. FIG. 3 (e) is shown in FIG. 2 (c).
It is an example in which a frame body (21) is provided to the electromagnetic wave shielding structure.
FIG. 3 (f) shows a transparent layer (5) provided on the surface of the electromagnetic wave shielding adhesive film (8) of FIG. 1 (d) on which the geometrical figures are formed, and the adhesive layer on the plastic film (3) side. It is laminated on one side of the plastic plate (11) via (12), and the adhesive layer (1
This is an example in which a frame is provided on the electromagnetic wave shielding structure (10) in which the plastic film (13) is bonded via the 2).
The frame body (21) described above is not limited to this, and may be a conductive material such as a metal foil, a conductive adhesive or a conductive tape. The above configuration is an example, and there are many combinations.

A layer having an infrared ray shielding property, a layer having an antireflection treatment, a layer having an antiglare treatment, on any surface of the electromagnetic wave shielding adhesive film or the electromagnetic wave shielding structure,
A layer having high surface hardness and abrasion resistance can be formed. These are examples and can be used in other forms. An electromagnetic wave shielding adhesive film may be adhered to one surface of the glass plate, and this glass plate may be attached to the front surface of the display so that the glass surface is outside the display device.

In the present invention, it is preferable to remove at least a part of the frame part by removing the adhesive layer and the plastic film supporting the conductive frame part by laser.
Lasers include YAG lasers, carbon dioxide lasers, TEA carbon dioxide lasers, argon ion lasers, excimer lasers, etc., but with this configuration, the removal area is wide, and if the PET film and adhesive layer are combined, it must be removed at a depth of 50 μm or more. YAG laser, carbon dioxide gas laser, and TEA carbon dioxide gas laser are preferable because they must be processed in the shortest possible time from the viewpoint of mass productivity. Since the conductive frame portion that is electrically connected to the geometric figure drawn by the conductive metal is formed on the outer periphery of the electromagnetic wave shielding adhesive film, if the laser output of the processing surface processed from the plastic film surface side is small Insufficient removal of the plastic film and adhesive layer in the frame part,
If it is too large, the conductive metal in the frame portion will be broken, so 10 to 100 W is preferable, and 20 to 40 W is more preferable.

In the present invention, since the frame portion is formed, the adhesive layer supporting the conductive frame portion and the plastic film are removed by sandblasting to expose at least a part of the frame portion. The sandblast treatment is performed by spraying an abrasive on the unmasked portion and selectively etching the unmasked portion. As the blast material used for sandblasting, the particle diameter of glass beads, alumina, silica, silicon carbide, zirconium oxide, etc.
Fine particles of about 150 μm are used. In the present invention, a part or the whole of the frame except the frame is covered with a mask material to remove the plastic film and the adhesive from the frame. The mask material is not limited as long as it can be protected from being scratched during the sandblasting process, such as rubber, photoresist, plastic film, plastic plate, metal, ceramic and wood.

In the present invention, it is also possible to use a conductive three-dimensional network structure in which a conductive frame portion electrically connected to a geometrical figure drawn by a conductive metal is formed on the outer periphery of the geometrical figure. it can. For the conductive three-dimensional network structure, synthetic resin foam having a three-dimensional network structure such as urethane foam is pretreated with an electroless metal plating catalyst or the like, and a metal layer such as nickel or copper is electrolessly placed in the plating tank. Three-dimensional mesh structure of electrodeposited metal, urethane foam, etc., made by plating and increasing the thickness of plated metal by combining with electroplating, then baking to decompose and burn off the resin, and transfer the shape of foamed resin Synthetic resin foam by immersing a synthetic resin foam with a three-dimensional network structure in a slurry prepared by mixing metal powder, thickening polymer and solvent, applying metal powder to the skeleton of the foam, and then heat treating Adhesive agent for three-dimensional network structure of metal produced by decomposing and burning the body and sintering of metal powder to transfer the shape of the foamed resin, and synthetic resin foam having an open cell structure such as urethane foam After the liquid is impregnated and dried, the metal powder is shaken to adhere to the synthetic resin foam, and then fired to decompose and burn off the resin, and the metal powder is sintered to transfer the shape of the foamed resin. it can.

In the electromagnetic wave shielding adhesive film or the electromagnetic wave shielding structure of the present invention, the plastic film of the electromagnetic wave shielding adhesive film provided on the plastic plate or the plastic plate or the surface of the plastic film is
It is preferable that antiglare treatment or antireflection treatment is applied. Forming these treatments on a plastic film is shown below as a typical example. The same can be applied to a plastic plate or the like. Anti-reflection treatment,
It means increasing the transmittance of visible light by preventing the reflection of visible light. In this antireflection treatment, the minimum reflection wavelength is defined by the coating thickness of the antireflection layer and the refractive index.
d = (m + 1/2) λ / 2 (n: refractive index, d: coating thickness, λ: wavelength, m = 0, 1, 2, 3, ...) That is, since n is determined by the substance, the wavelength with the minimum reflectance (maximum transmittance) can be selected by adjusting the film thickness. Further, the antireflection layer has a single-layer structure or a two-layer structure having a refractive index different from that of the plastic film.
Some have a multi-layer structure of more than one layer. For a single layer structure, a material having a smaller refractive index than a plastic film is selected. On the other hand, in the case of forming an excellent multilayer structure by antireflection treatment, a material layer having a larger refractive index than that of the plastic film is provided, and a material layer having a smaller refractive index is provided on the material layer. Although the materials have different refractive indices, it is more preferable to use a multilayer structure having three or more layers so that the refractive index of the outermost layer is smaller than the virtual refractive index adjacent to the outermost layer. As a material for forming such an antireflection layer, any known material may be used, for example, CaF ₂ , MgF ₂ , NaAlF ₆ , Al ₂ O ₃ , SiOx (x = 1.
2), ThF ₄ , ZrO ₂ , Sh ₂ O ₃ , Nd ₂ O ₃ , SnO ₂ , TiO ₂ , and other dielectric materials, and their refractive index and film thickness are appropriately selected so as to satisfy the above relationship. It

The antiglare treatment is for preventing the display from flickering and tired eyes, and any known material may be used as a material for forming such an antiglare layer. It is preferably a layer containing inorganic silica. Such an inorganic silica layer includes an epoxy resin such as a bisphenol A type epoxy resin, a bisphenol F type epoxy resin or a novolac type epoxy resin, a polyene isoprene, a polyene-1,2-butadiene, a polyene butene or a diene resin such as polybutene, an ethyl acrylate. , Butyl acrylate, 2-ethylhexyl acrylate, t
-Polyacrylic ester copolymers such as butyl acrylate, polyester resins such as polyvinyl acetate and polyvinyl propionate, polyethylene,
A cured film dispersed and bound in a curable resin such as a polyolefin resin such as polypropylene, polystyrene, EVA or a silicone resin is preferably used as the antiglare layer.

When forming the film of the antiglare layer,
First, a composition in which silica particles are blended in a resin and various additives such as an antistatic agent and a polymerization initiator are added as necessary,
Usually, it is diluted with a solvent to prepare an antiglare treatment agent having a solid content of about 20 to 80% by weight. The silica particles used here are amorphous and porous, and a typical example thereof is silica gel. The average particle size is usually 30μ
m or less, preferably about 2 to 15 μm.
Further, the mixing ratio is preferably such that the silica particles are 0.1 to 10 parts by weight with respect to 100 parts by weight of the resin.
If it is too small, the antiglare effect is poor, and if it is too large, the visible light transmittance and the film strength are lowered. The antiglare agent is applied to one surface of the plastic film by a suitable means such as a gravure coater, a reverse coater, or a spray coater which is a general solution coating means so that the film thickness after drying is usually about 5 to 30 μm. It is preferable that the composition is applied to, and dried by heating, and then cured by ultraviolet irradiation, electron beam irradiation, or heating. The antiglare treatment layer comprising the silica particle-containing coating thus obtained imparts good antiglare property to the substrate when the plastic film having the treatment layer is bonded to the plastic substrate, and Since the hardness of the film is high and the scratch resistance is excellent, it greatly contributes to the improvement of the scratch resistance of the plastic. Prior to the formation of such an antiglare layer, the adherend surface, that is, the surface of the plastic film may be subjected to corona discharge treatment, plasma treatment, sputter etching treatment, or easy adhesion treatment as pretreatment. Thereby, the adhesiveness between the plastic film and the antiglare layer can be enhanced.

In the present invention, it is preferable that the electromagnetic wave shielding composition such as the electromagnetic wave shielding adhesive film or the electromagnetic wave shielding adhesive film provided on the plastic plate, the plastic film, or the adhesive layer contains an infrared absorber. The infrared absorber preferably has a high infrared absorptivity in the region of 900 to 1 and 100 nm, and metal oxides such as iron oxide, cerium oxide, tin oxide and antimony oxide, or indium-tin oxide (hereinafter ITO), Tungsten hexachloride, tin chloride, cupric sulfide, chromium-cobalt complex salt, thiol-nickel complex or aminium compound, adhesive layer described above such as an organic infrared absorber such as diimonium compound (manufactured by Nippon Kayaku Co., Ltd.), The composition, which is contained in a plastic film or a plastic plate or dispersed in a binder resin, can be applied to one surface of the plastic for use. Among these infrared absorbing compounds, organic infrared absorbing agents such as cupric sulfide, ITO, aminium compounds and diimonium compounds have the most effective infrared absorbing effect. What should be noted here is the particle size of primary particles of these compounds. If the particle size is too large than the wavelength of infrared rays, the shielding efficiency is improved, but diffuse reflection occurs on the particle surface, haze increases, and transparency decreases. On the other hand, if the particle size is too small compared to the wavelength of infrared rays, the shielding effect will be reduced. The preferred particle size is 0.01 to 5 μm, more preferably 0.1 to 3 μm. The infrared absorber is uniformly dispersed in the adhesive or binder resin of the adhesive layer. The optimum amount of the compound is 0.01 to 10 parts by weight of the infrared absorbing agent with respect to 100 parts by weight of the adhesive or binder resin, and more preferably 0.1 to 5 parts by weight. If it is less than 0.01 parts by weight, the infrared ray shielding effect is small, and if it exceeds 10 parts by weight, the transparency is impaired.
In the case of the binder resin composition, it is applied to at least one surface of the plastic film in a thickness of 0.1 to 10 μm. The applied composition containing an infrared absorber may be cured using heat or UV. The adhesive layer can be formed on the binder resin. It is preferable in terms of production that the infrared absorbing agent is directly mixed with the adhesive composition to be the adhesive layer and used, which is preferable.

[0034]

EXAMPLES The present invention will now be specifically described with reference to Examples, but the present invention is not limited thereto. <Preparation Example 1 of Electromagnetic Wave Shielding Adhesive Film> As a plastic film, a polyethylene terephthalate film (Diahard EX-
205; trade name manufactured by Reiko Co., Ltd., and an electrolytic copper foil having a thickness of 18 μm, which is a conductive metal, is formed on the roughened surface thereof via an adhesive composition having a thickness of 20 μm, which will be described later. The adhesive side, 180 ° C, 30kgf
Pile with copper foil by heating and laminating under conditions of / cm
An ET film was obtained. A photolithography process (resist film application-exposure-development-chemical etching-resist) was applied to the obtained PET film with copper foil using a geometric film and a negative film having a frame portion with a width of 10 mm around the periphery of the geometric pattern. After film peeling), line width 2
A copper grid pattern having a frame portion of 5 μm and a line interval of 250 μm was formed on a PET film, and thereafter sodium chlorite 31 g / l and trisodium phosphate 12 g /
1, in an aqueous solution of 15 g / l of sodium hydroxide, 95 ° C 2
The surface of the copper was blackened by treating for minutes to obtain an electromagnetic wave shielding adhesive film 1 (configuration of FIG. 1 (b)).

<Preparation Example 2 of Electromagnetic Wave Shielding Adhesive Film>
＞ PET the frame part of the electromagnetic wave shielding adhesive film 1
From the film side, using IMPACT L500 (trade name, manufactured by Sumitomo Heavy Industries, Ltd.), laser processing was performed under conditions of voltage 20 kV, frequency 150 Hz, scan speed 200 mm / min, and the PET film and adhesive layer on the frame part After removal, an electromagnetic wave shielding adhesive film 2 was obtained (configuration of FIG. 1 (c)).

<Preparation Example 3 of Electromagnetic Wave Shielding Adhesive Film 3
> PET film with anti-reflection treatment (Rialck 1
300; Nippon Oil & Fats Co., Ltd. product name, thickness 50 μm) on the surface which is not subjected to antireflection treatment, using the adhesive composition used in Preparation Example 1 of electromagnetic wave shielding adhesive film so that the dry coating thickness is 20 μm The adhesive film produced by applying to 180 ° C. on the geometrical figure of the electromagnetic wave shielding adhesive film 1 so as not to cover the entire frame,
The laminate was heated and laminated under the condition of 30 kgf / cm and adhered to obtain an electromagnetic wave shielding adhesive film 3 (Fig. 1).
(D) configuration).

<Preparation Example 4 of Electromagnetic Wave Shielding Adhesive Film>
> A thickness of 2 μm on a transparent PET film having a thickness of 25 μm via an adhesive composition which will be described later and becomes an adhesive layer having a thickness of 30 μm.
A 5 μm aluminum foil was adhered. PE with this aluminum foil
Using a negative film having a frame portion with a width of 30 mm on the outer periphery of the T film, the photolithography process similar to the electromagnetic wave shielding adhesive film preparation example 1 was performed to obtain a line width of 25
An aluminum grid pattern having a width of 250 μm, a line interval of 250 μm, and a frame portion of 30 mm was formed on a PET film, and the frame portion was folded toward the PET film to obtain an electromagnetic wave shielding adhesive film 4 (configuration of FIG. 1E).

<Electromagnetic Wave Shielding Adhesive Film Production Example 5
> A line width of 12 μm, a line interval of 500 μm, and a thickness of 2 μm by forming electroless nickel plating in a grid pattern on a PET film having a thickness of 50 μm using a mask layer.
The nickel grid pattern of the above is prepared on the PET film, and the conductive tape (CH
O-FOIL CCH; product name of Taiyo Wire Mesh Co., Ltd.) was attached with a width of 15 mm to form a frame portion, and an electromagnetic wave shielding adhesive film 5 was obtained (configuration of FIG. 1 (f)).

<Preparation Example 6 of Electromagnetic Wave Shielding Adhesive Film 6
> Using the negative film having only geometrical figures to the PET film with copper foil obtained in the electromagnetic wave shielding adhesive film preparation example 1, the photolithography process similar to the electromagnetic wave shielding adhesive film preparation example 1 was used to obtain a line width of 25 μm and a line. Formed on the PET film are copper grid patterns with a spacing of 250 μm, and foamed metallic copper (thickness 5 mm, manufactured by Hitachi Chemical Co., Ltd.) with polyurethane foam as a base skeleton on the outer periphery of the surface having a geometric figure at room temperature, 5 kgf. / Cm ²
With a pressure of, a frame portion was formed by adhering to a width of 15 mm to obtain an electromagnetic wave shielding adhesive film 6 (configuration of FIG. 1 (g)).

<Adhesive Composition> 200 cm ³ of toluene, 50 g of methyl methacrylate (MMA), 5 g of ethyl methacrylate (EA), 2 g of acrylamide (AM) and 250 mg of AIBN were put in a 500 cm ³ three-necked flask,
The mixture was stirred at 100 ° C. for 3 hours under reflux while bubbling with nitrogen. The polymer obtained by reprecipitation with methanol was filtered and dried under reduced pressure to obtain a polyacrylic acid ester in a yield of 75%. This was the main component of the adhesive composition. Polyacrylic acid ester (MMA / EA / AM = 88/9/3, Mw = 700,000) 100 parts by weight Toluene 450 parts by weight Ethyl acetate 10 parts by weight

[0041] <Composition forming the infrared shielding layer> Byron UR-1400 (trade name of Toyobo Co., Ltd .; saturated polyester resin, Mn = 40,000) 100 parts by weight IRG-022 (infrared absorber: trade name by Nippon Kayaku Co., Ltd .; aminium compound ) 1.2 parts by weight MEK 285 parts by weight Cyclohexanone 5 parts by weight

(Example 1) PET subjected to antireflection treatment
Infrared shielding obtained by applying the above-mentioned composition forming the infrared shielding layer to the surface of the film (Rialck 1300; trade name of NOF CORPORATION) that has not been subjected to antireflection treatment so that the dry coating thickness is 10 μm. The adhesive surface of the adhesive film having the property and the surface on which the geometrical figure of the electromagnetic wave shielding adhesive film 2 is drawn are put on a commercially available acrylic plate (COMO glass; manufactured by Kuraray Co., Ltd., thickness 3 mm) at 110 ° C. for 3 days.
The electromagnetic wave shielding structure obtained by thermocompression bonding using a hot press machine under the conditions of 0 kgf / cm ² and 30 minutes was set as Example 1 (structure of FIG. 2 (b)).

Example 2 The surface of the electromagnetic wave shielding adhesive film 1 coated with the above adhesive composition on the PET film side on which no geometrical figure is drawn so that the dry coating thickness is 10 μm, and antireflection. On the surface of the treated PET film (Rialc 1300; trade name of NOF CORPORATION) that has not been subjected to antireflection treatment, the composition forming the above-mentioned infrared ray shielding layer is applied so that the dry coating thickness is 10 μm. Using a roll laminator, the adhesive surface of the adhesive film having infrared shielding properties obtained by using a commercially available acrylic plate (COMO glass; Kuraray Co., Ltd. product name, thickness 3 mm),
An electromagnetic wave shielding structure obtained by thermocompression bonding under the conditions of 110 ° C. and 20 Kgf / cm ² was used as Example 2 (FIG. 2 (c)).
Configuration).

(Example 3) An electromagnetic wave shielding structure obtained in the same manner as in Example 2 was used as Example 3 except that the electromagnetic wave shielding adhesive film 5 was used (structure of Fig. 2 (d)).

Example 4 An electromagnetic wave shielding structure obtained in the same manner as in Example 2 except that the electromagnetic wave shielding adhesive film 6 was used was set as Example 4 (structure of FIG. 2 (e)).

(Example 5) A film having a frame portion of the electromagnetic wave shielding structure obtained in Example 1 and side portions of an acrylic plate and an infrared ray shielding layer was formed into a conductive tape (CHO) having a width of 23 mm.
-FOIL CCH; a product name manufactured by Taiyo Wire Mesh Co., Ltd.) was used to form an electromagnetic wave shielding structure, which was taken as Example 5 (Fig. 3 (b)).

Example 6 Instead of the conductive tape, a foamed metal copper (manufactured by Hitachi Chemical Co., Ltd.) having a three-dimensional mesh structure of polyurethane foam having a width of 23 mm and a thickness of 5 mm as a substrate skeleton was used. An example of an electromagnetic wave shielding structure obtained by covering the frame portion of the electromagnetic wave shielding structure obtained in 1 above, a side of an acrylic plate, and a film on which an infrared shielding layer is formed in a frame shape and press-bonding at room temperature and 5 kgf / cm ² It was set to 6.

Example 7 The conductive tape of Example 5 was
Example 7 was an electromagnetic wave shielding structure obtained in the same manner as in Example 5 except that the metal of the frame portion was covered so as to be exposed by 5 mm (FIG. 3C).

(Embodiment 8) The conductive tape of Embodiment 5 is
Example 8 was an electromagnetic wave shielding structure obtained by adhering so as to cover only the frame portion and the side portion of the acrylic plate (FIG. 3).
(D)).

(Example 9) Using the electromagnetic wave shielding structure obtained in Example 2, a film having a frame portion of the electromagnetic wave shielding structure, a side of an acrylic plate and an infrared shielding layer formed thereon has a width of 23 m.
An electromagnetic wave shielding structure obtained by covering with a conductive tape of m (CHO-FOIL CCH; product name of Taiyo Wire Mesh Co., Ltd.) in a frame shape was used as Example 9 (FIG. 3 (e)).

Example 10 An electromagnetic wave shielding structure obtained in the same manner as in Example 9 except that the electromagnetic wave shielding adhesive film 3 was used was set as Example 10 (FIG. 3 (f)).

(Example 11) An electromagnetic wave shielding structure obtained in the same manner as in Example 5 except that the electromagnetic wave shielding adhesive film 4 was used was set as Example 11 (Fig. 3 (g)).

(Embodiment 12) Line width from 25 μm to 3
Example 12 was an electromagnetic wave shielding structure obtained in the same manner as in Example 5 except that the thickness was 5 μm.

(Example 13) Line width from 25 μm to 1
An electromagnetic wave shielding structure obtained in the same manner as in Example 5 with a thickness of 2 μm was used as Example 13.

Example 14 An electromagnetic wave shielding structure obtained in the same manner as in Example 5 except that the line interval was changed from 250 μm to 500 μm was used as Example 14.

(Example 15) An electromagnetic wave shielding structure obtained in the same manner as in Example 5 was used as Example 15 except that the line spacing was changed from 250 µm to 150 µm.

(Example 16) An electromagnetic wave shielding composition obtained in the same manner as in Example 5 was carried out except that a repetitive pattern of regular triangles was prepared instead of the lattice pattern formed in Preparation example 2 of the electromagnetic wave shielding adhesive film. It was set as Example 16.
The equilateral triangle is shown in FIG.

(Example 17) An electromagnetic wave shielding structure obtained in the same manner as in Example 5 except that a repeating pattern of regular octagons and squares was prepared instead of the lattice pattern formed in Preparation example 2 of the electromagnetic wave shielding adhesive film. The body was designated as Example 17. The repeating pattern of regular octagons and squares is as shown in FIG. 4 (b).

(Comparative Example 1) Instead of the copper foil, an ITO film deposited on the entire surface of an ITO film of 2,000Å was used.
Without forming a pattern, an adhesive composition having a thickness of 5 μm was applied to the film on the surface opposite to the vapor deposition surface, and a commercially available acrylic plate (COMOGRAS; manufactured by Kuraray Co., Ltd., thickness 3 mm) was used.
A conductive tape having a width of 23 mm is formed on the frame part of the electromagnetic wave shielding structure and the side part and the peripheral part of the acrylic plate obtained by heating and pressure bonding using a heat press machine under the conditions of 110 ° C., 30 kgf / cm ² , and 30 minutes ( A comparative example 1 was an electromagnetic wave shielding structure obtained by covering in a frame shape with CHO-FOIL CCH (trade name of Taiyo Wire Mesh Co., Ltd.).

(Comparative Example 2) Similar to Comparative Example 1, instead of ITO, the entire surface was vapor-deposited with aluminum (200 Å) and the pattern was not formed, and the film on the surface opposite to the vapor-deposited surface was coated with an adhesive composition having a thickness of 5 μm. An electromagnetic wave shielding structure obtained in the same manner as Comparative Example 1 was used as Comparative Example 2.

[0061]

The aperture ratio, electromagnetic wave shielding property, visible light transmittance, non-visibility, infrared shielding ratio, and adhesive force of the mesh of the electromagnetic wave shielding structure obtained as described above were measured. The results are shown in Tables 1 and 2.

The electromagnetic wave shielding properties are as follows: spectrum analyzer MS2601B, standard signal generator MG3
602B, measuring cell MA8602B (above Advantest product name) frequency range 10MH
The electromagnetic wave shielding property between z and 1 GHz is measured and 100
The values of MHz and 1 GHz are shown as typical values. The visible light transmittance was measured with a double beam spectrophotometer (Hitachi, Ltd., Model 200-10) at 400 to 700 n.
The average value of the transmittance in the region of m was used. The non-visibility is evaluated by observing the electromagnetic wave shielding structure in which the electromagnetic wave shielding adhesive film is adhered to the acrylic plate from a place 0.5 m away and recognizing the geometric figure formed of the conductive metal. Those that could not be recognized were rated as good, and those that could be recognized were rated as NG. For the measurement of the infrared shielding ratio, a double beam spectrophotometer (U-3410, Hitachi, Ltd.) was used, and the average value of the infrared shielding ratio in the region of 900 to 1,100 nm was used. The adhesive strength is measured by a tensile tester (trade name: Tensilon UTM-4-10, manufactured by Toyo Baldwin Co., Ltd.).
0), width 10 mm, 90 ° direction, peeling speed 50
It was measured in mm / min.

[0064]

[Table 1]

[0065]

[Table 2]

A conductive frame portion having a geometric figure drawn with a conductive metal of the present invention and having a conductive frame portion electrically connected to the geometric figure drawn around the geometric figure drawn with the conductive metal is formed. The example having the above is superior in electromagnetic wave shielding property to the comparative example 3 having no frame portion. In addition, in the embodiment, as shown in FIG.
The electromagnetic wave shielding properties of Examples 1, 2, 3 and 4 corresponding to the configurations of (b), (c), (d) and (e) are 35, respectively.
Although it is about 42 dB, Examples 5 to 11 having the structure shown in FIG. 3 in which the frame body is provided have the same aperture ratio and visible light transmittance and an electromagnetic wave shielding property of 42 to 52 dB, which is excellent in shielding effect. The line width of the geometrical figure of Example 12 is 25 μm.
When the thickness is changed from (Example 5) to 35 μm, the aperture ratio is reduced from 81% to 74% and the visible light transmittance is also reduced from 62% to 56%, but the area of the conductive metal is increased and the electromagnetic wave shielding property is improved. To do. Similarly, in Example 13, the line width is 25
When the thickness is changed from μm (Example 5) to 12 μm, the aperture ratio is 81%.
From 91% to 91%, and visible light transmittance from 62% to 70%
However, since the area of the conductive metal decreases, the electromagnetic wave shielding property decreases. In Example 14, the line interval is 250.
In the case of changing from μm (Example 5) to 500 μm,
Although the aperture ratio and light transmittance are improved, the electromagnetic wave shielding property is deteriorated. Similarly, in Example 15, the line interval is set to 25.
0 μm (Example 5) to 125 μm,
The aperture ratio and light transmittance are reduced, and the electromagnetic wave shielding property is improved. As described above, the tendency was shown by changing the line width and the line interval drawn by the conductive metal. The geometric figure of the electromagnetic wave shielding adhesive film has a line width of 40 μm or less and a line interval of 100 μm. that's all,
A conductive metal having a line thickness of 40 μm or less showed a preferable value. Comparative Examples 1 and 2 are cases where ITO or Al is vapor-deposited, but the electromagnetic wave shielding properties are poor. The present invention has a geometrical figure drawn in a conductive metal, as shown in FIG.
Moreover, by having a conductive frame portion electrically connected to the geometrical figure on the outer periphery of the geometrical figure drawn by the conductive metal, the electromagnetic wave shielding property is excellent, and as shown in FIG. By covering the frame, the electromagnetic wave shielding property is further improved.

[0067]

As is apparent from the examples, the electromagnetic wave shielding adhesive film for a display of the present invention increases the contact area with the external electrode for grounding, and has a good connection with the external electrode for grounding. In addition, since it can be easily attached to an adherend for use and has excellent adhesion, it has no electromagnetic wave leakage and has a particularly good shielding function over a wide frequency band. Further, it has good optical properties such as visible light transmittance and non-visibility, and has little change in adhesive property at high temperature for a long time, which is good, and it is possible to provide an excellent electromagnetic wave shielding adhesive film for display. . plus
Conductive metal on the surface of the tic film through the adhesive layer
Conductive material of the provided plastic film with conductive metal
Microlithography of geometric figures made of metal foil
It is a disc with excellent workability
To provide an electromagnetic wave shielding adhesive film for play
You can Of geometric figures drawn with metal foil of conductive material
Line width 40μm or less, line spacing 100μm or less
Above, transparent by setting the line thickness to 40 μm or less
Electromagnetic wave shielding for displays with excellent visibility and non-visibility
An adhesive film can be provided. Since the frame portion according to claim 2 is formed of a metal foil of a conductive material, the contact resistance between the geometrical figure drawn with the conductive metal and the conductive frame portion located on the outer periphery of the geometrical figure. Can be made smaller and the electromagnetic wave shielding property is excellent. By exposing at least a part of the conductive frame portion according to the third aspect, it is possible to provide an electromagnetic wave shielding adhesive film for a display that can be grounded from the plastic film surface side and facilitate connection. By forming with a laser to remove part or all of the contact Chakuzaiso and the plastic film, processability, excellent in mass production, and process it can be simplified since a dry process. Since the adhesive layer and the plastic film supporting the conductive frame part are removed to expose at least a part of the frame part, the adhesive layer and the plastic film are partially or entirely formed by sandblasting. Excellent in mass productivity. The width of the frame portion according to claim 4 is in the range of 1 to 40 mm.
By surrounding it, good contact with the external electrode for grounding can be achieved.
You can continue .

[0068]

Since the conductive material according to claim 5 is copper and at least the surface thereof is blackened, it is possible to provide an electromagnetic wave shielding adhesive film for a display which has a small discoloration and a large contrast. . An electromagnetic wave shielding adhesive film for display having an electromagnetic wave shielding property and an infrared ray shielding property, which is transparent, inexpensive, has good heat resistance and is excellent in handleability, by using the polyethylene terephthalate film or the polycarbonate film as the plastic film according to claim 6. Can be provided. By using copper, aluminum or nickel having a thickness of 0.5 to 40 μm of the metal foil of the conductive material according to claim 7 , excellent workability and adhesiveness, and inexpensive electromagnetic wave shielding property and non-visibility are obtained. It is possible to provide an electromagnetic wave shielding adhesive film for a display having the same. By providing a transparent layer through an adhesive layer on at least a part of the geometrical pattern portion and the frame portion according to claim 9 , the geometrical pattern can be protected. By bending the conductive frame part on the plastic film side of the plastic film with conductive metal and exposing the conductive metal of the frame part on the plastic film side, it is possible to connect to the external electrode for grounding by a simple method. Can be good. By attaching a conductive tape to the outer periphery of the geometric figure to form a frame portion, it is possible to increase the contact area with the external electrode for grounding and improve the connection with the external electrode for grounding. it can. By forming a conductive three-dimensional mesh structure on the outer periphery of the geometric figure to form a frame part, the contact area with the external electrode for grounding is increased and the connection with the external electrode for grounding is good. Can be An electromagnetic wave shielding adhesive film having an infrared ray shielding property can be provided by including an infrared absorbing agent in any of the layers constituting the electromagnetic wave shielding adhesive film according to the tenth aspect .

By providing the electromagnetic wave shielding adhesive film for a display on at least one surface of the plastic plate according to claim 11 , an electromagnetic wave shielding structure excellent in transparency and invisibility and having less warpage is provided. You can The plastic plate according to claim 12 is provided on one surface thereof with a surface on which a conductive geometrical figure of the electromagnetic wave shielding adhesive film is drawn, via an adhesive layer, and on the other surface via an adhesive layer. By providing the plastic film as described above, it is possible to provide an electromagnetic wave shielding structure which is excellent in transparency and non-visibility and has less warpage. Claim
13. An electromagnetic wave shielding structure in which the electromagnetic wave shielding adhesive film is provided on one surface of the plastic plate according to 13 , and the conductive frame portion is deformed so as to be bent, and the frame portion reaches the opposite surface of the plastic plate. By doing so, it is possible to provide an electromagnetic wave shielding structure that is excellent in transparency and non-visibility and has less warpage. By making an electromagnetic wave shielding structure by attaching a conductive tape to a part of the frame portion of the electromagnetic wave shielding adhesive film of the electromagnetic wave shielding structure,
It is possible to provide an electromagnetic wave shielding structure having reduced electromagnetic wave leakage due to good contact with an external electrode for grounding, simple attachment, and excellent aesthetics. Electromagnetic wave leakage due to good contact with an external electrode for grounding by using an electromagnetic wave shielding structure in which a conductive three-dimensional mesh structure is in contact with at least the frame portion of the electromagnetic wave shielding adhesive film of the electromagnetic wave shielding structure. It is possible to provide an electromagnetic wave shielding structure having reduced noise, simple attachment, and excellent aesthetics. An electromagnetic wave shielding property and an infrared ray shielding property can be obtained by forming an electromagnetic wave shielding structure containing an infrared ray absorbent in at least one of an electromagnetic wave shielding adhesive film, a plastic plate, a plastic film or an adhesive layer constituting the electromagnetic wave shielding structure. It is possible to provide an electromagnetic wave shielding structure having the same. Anti-glare property of the electromagnetic wave shielding structure by using the plastic film of the electromagnetic wave shielding adhesive film provided on the plastic plate or the electromagnetic wave shielding structure having the plastic plate or the plastic film surface subjected to anti-glare treatment or anti-reflection treatment Alternatively, antireflection property can be imparted. By providing an electromagnetic wave shielding structure in which a frame is provided in the peripheral portion of the electromagnetic wave shielding structure so as to be in contact with the frame portion, an electromagnetic wave shielding structure that prevents leakage of electromagnetic waves, has excellent electromagnetic wave shielding properties, and has an improved aesthetic appearance is provided. Can be provided.

By using the electromagnetic wave shielding adhesive film according to claim 14 for a display, it has electromagnetic wave shielding properties and transparency, reduces electromagnetic wave leakage, has excellent infrared shielding properties, and is an external electrode for grounding. It is possible to provide a display that can be well connected to. By using the electromagnetic wave shielding structure according to claim 15 for a display, it has electromagnetic wave shielding properties and transparency, reduces electromagnetic wave leakage, has excellent infrared shielding properties, and is well connected to an external electrode for grounding. A display that can be provided. Display of the present invention
The electromagnetic wave shielding adhesive film for a display and the electromagnetic wave shielding structure for a display have excellent electromagnetic wave shielding properties and transparency, and therefore, in addition to the display, a measuring device that generates or protects electromagnetic waves, It can be used by being provided in a window or a casing that looks into the inside of a measuring device or a manufacturing apparatus, and particularly in a site such as a window requiring transparency.

[Brief description of drawings]

1 shows an electromagnetic wave shielding adhesive film of the present invention, (a) is a front view of the electromagnetic wave shielding adhesive film, and (b) to (g) are sectional views.

FIG. 2 shows an electromagnetic wave shielding structure of the present invention, (a) is a perspective view, and (b) to (e) are sectional views.

FIG. 3 shows an electromagnetic wave shielding structure according to the present invention, in which (a) is a perspective view and (b) to (g) are sectional views.

4A and 4B are explanatory views of a geometrical figure drawn with a conductive metal of the present invention.

[Explanation of symbols]

1. Conductive frame 2. Geometric figure drawn with conductive metal 3. Plastic film 4. Adhesive layer 5. Transparent layer 6. Conductive material 7. Conductive three-dimensional mesh structure 8. Electromagnetic wave shielding adhesive film 10. Electromagnetic wave shielding structure 11. Plastic plate 12. Adhesive layer 13. Plastic film 21. Frame

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroyuki Hagiwara 1500 Ogawa, Shimodate-shi, Ibaraki Hitachi Chemical Co., Ltd. Shimodate Research Laboratory (72) Inventor Aya Hashiwa, Ogawa 1500 Shimodate, Ibaraki Hitachi Chemical (56) Reference JP-A-5-218673 (JP, A) JP-A-5-251890 (JP, A) JP-A-11-26980 (JP, A) JP-A-9-306366 (JP, A) JP-A-9-178928 (JP, A) JP-A-7-282729 (JP, A) JP-A-7-237976 (JP, A) JP-A-11-84041 (JP, A) Kaihei 9-107193 (JP, A) JP 2-109399 (JP, A) JP 10-16416 (JP, A) JP 2-296398 (JP, A) JP 9-148782 ( JP, A) Actually open 62-199999 (JP, U) Actually open 1-1 11277 (JP, U) Actual Kaihei 5-54790 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H05K 9/00

Claims (15)

(57) [Claims] 1. A plastic film and the plastic film
Adhesive layer provided on the adhesive film and the adhesive layer
Geometric figures drawn from metal foil of conductive material
Electromagnetic shielding film odor for Ranaru display
And the metal foil of the conductive material is a bonding surface to the adhesive layer.
Is roughened, and the geometrical figures are formed by chemically etching the metal foil.
It is drawn by a process, the line width is 40 μm or less, the line interval is 100 μm or more, and the line thickness is 40 μm or less.
, And the and the are provided with a frame portion outer periphery of the geometric shapes and electrically connected to the conductive geometric shapes, the adhesive layer is intended to flow by heating or pressurizing, and A roughened shape is transferred by adhesion with the metal foil and has a roughened surface, and the geometrical figure and the adhesive layer are roughened.
An electromagnetic wave shielding film for a display, comprising a transparent layer adhered to the surface by heating or pressing . 2. The geometric figure and the frame portion are attached together.
By chemical etching process on the combined metal foil
Leave the frame part where the geometric figure is electrically connected to the outer periphery
The electromagnetic wave shielding film for a display according to claim 1, which is formed by the following method . 3. The electromagnetic wave shielding film for a display according to claim 1, wherein at least a part of a conductive frame portion electrically connected to the geometrical figure formed on the metal foil is exposed. 4. A layer formed on the metal foil of the conductive material.
The width of the conductive frame that is electrically connected to the geometric pattern is 1 to
The electromagnetic wave shielding film for a display according to any one of claims 1 to 3, which has a thickness of 40 mm . 5. The electromagnetic wave shielding film for a display according to claim 1, wherein the conductive material is copper, and at least the surface of the metal foil is blackened. 6. The plastic film is polyethylene
Terephthalate film or polycarbonate film
The electromagnetic wave shielding film for a display according to any one of claims 1 to 5, which is rum . 7. A metal foil of the conductive material, a thickness of 0.5
The electromagnetic wave shielding film for a display according to any one of claims 1 to 6, which is copper, aluminum or nickel having a thickness of -40 μm . 8. The electromagnetic wave shielding film for a display according to claim 1 , wherein a pressure is applied when a transparent layer is provided on the geometrical figure. 9. An adhesive layer is further provided on the geometrical pattern.
The electromagnetic wave shielding film for a display according to any one of claims 1 to 8, which is provided with a transparent layer therebetween . 10. The electromagnetic wave shielding property for the display
Infrared absorber is contained in any of the layers that make up the film
The electromagnetic wave shielding film for a display according to any one of claims 1 to 9. 11. The method according to any one of claims 1 to 10.
Electromagnetic wave shielding film for display and plastic
Stack a plastic plate or glass plate
An electromagnetic wave shielding structure for a display that is formed by applying pressure . 12. A plastic film and the plastic film
Adhesive layer provided on the adhesive film and on the adhesive layer
Geometrical figures drawn from metal foil of conductive materials that are bonded together
Yes electromagnetic wave shielding film for a display consisting of
In the electromagnetic wave shielding structure for a display, the metal foil of the conductive material has a bonding surface to the adhesive layer.
Is roughened, and the geometrical figures are formed by chemically etching the metal foil.
It is drawn by a process, the line width is 40 μm or less, the line interval is 100 μm or more, and the line thickness is 40 μm or less.
, And the and the are provided with a frame portion outer periphery of the geometric shapes and electrically connected to the conductive geometric shapes, the adhesive layer is intended to flow by heating or pressurizing, and A roughened shape is transferred by adhesion with the metal foil and has a roughened surface, and the geometrical figure and the adhesive layer are roughened.
Plastic adhered to the surface by heat or pressure
Transparent layer consisting of plate, plastic film or glass plate
The electromagnetic wave shielding structure for a display characterized by having
Adult . 13. Further, in the peripheral portion of the electromagnetic wave shielding structure.
The frame body is provided so as to be in contact with the frame portion.
An electromagnetic wave shielding structure for a display as described . 14. The method according to any one of claims 1 to 10.
Display electromagnetic wave shielding film for display
Electromagnetic wave shielding fill film that is applied by pressure on the surface of the ray
Display with a camera . 15. And a plastic film, the Plasti
Adhesive layer provided on the adhesive film and on the adhesive layer
Geometrical figures drawn from metal foil of conductive materials that are bonded together
In a display having an electromagnetic wave shielding film for a display , the metal foil of the conductive material has a bonding surface to the adhesive layer.
Is roughened, and the geometrical figures are formed by chemically etching the metal foil.
It is drawn by the process, line width is 40μm or less, line interval is 100μm or more, line thickness is 40μm or less.
, And the and the are provided with a frame portion outer periphery of the geometric shapes and electrically connected to the conductive geometric shapes, the adhesive layer is intended to flow by heating or pressurizing, and A roughened shape is transferred by adhesion with the metal foil and has a roughened surface, and the geometrical figure and the adhesive layer are roughened.
Surface and display surface are bonded by heat or pressure
A display characterized by that.