JPH01235195A - Static electricity, and electromagnetic wave shielding material - Google Patents

Abstract

PURPOSE:To provide a member with all of such functions as transmission of visible light and shielding against static electricity and electromagnetic wave by applying a transparent conductive layer on one side surface of a transparent film basic material and a transparent adhesive agent layer on the other, and then pasting other transparent by means of the adhesive agent. CONSTITUTION:A transparent conductive layer 1 is provided on one side surface of a transparent film basic material 2 to form a transparent conductive film, and an adhesive agent layer 3 is provided, on the empty side of this transparent conductive film that has no conductive layer and another transparent substrate is applied thereon by way of this adhesive agent layer. For a transparent film basic material, a plastic film such as a film made of polyethylene telephthalate is used. The transparent conductive layer provided on one side surface of the film basic material is made from stannic oxide and the like, and for the adhesive agent layer provided on the empty side surface having no conductive layer, acryl adhesive agent etc., is used. With this procedure it is possible to obtain a member provided with all of such functions as transmission of visible light, and shielding against static electricity and electromagnetic wave.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a static electricity and electromagnetic shielding material that is attached to various electronic and communication devices, such as devices equipped with display devices and the like.

[Conventional technology]

Conventionally, shielding materials used, for example, as window materials in devices equipped with the above-mentioned display devices, have a high visible light transmittance that allows the inside of the display to be seen from the outside, that is, excellent transparency (visibility).
It is also required to have shielding characteristics capable of shielding static electricity (high voltage) or electromagnetic waves generated from display devices and the like.

This type of shielding material mentioned above includes one in which mesh-type carbon fibers or metal-coated fibers are laminated onto a transparent member such as a glass substrate or a polycarbonate substrate, and one in which a metal oxide thin film is directly formed on the transparent member. It is widely used.

[Problem to be solved by the invention]

However, with the conventional shielding materials mentioned above, that is, those using mesh-type carbon fibers or metal-coated fibers, the image or object that passes through the substrate is cut at the mesh part, or the light is scattered due to reflection, causing fluctuations and making it difficult to see. On the other hand, when manufacturing products using metal oxides, a single operation of forming a metal oxide film on a transparent member must be repeated, resulting in poor productivity. Not only is this bad and costs high, but when a glass substrate is used as described above, there are problems in that it is easily damaged during work or use due to the properties of the glass substrate, and it cannot be bent. Furthermore, even when a plastic substrate is used, the thin film is easily scratched during the metal oxide film formation process, resulting in poor abrasion resistance.

Therefore, in order to solve the above-mentioned conventional problems, the present invention has a high visible light transmitting ability and an excellent shielding ability capable of shielding static electricity and electromagnetic waves generated from the display device of the above-mentioned device. , and static electricity with good workability and scratch resistance during production,
The purpose is to provide electromagnetic shielding materials.

[Means to solve the problem]

As a result of intensive studies to achieve the above object, the inventors provided a transparent conductive layer on one side of a transparent film base material to form a transparent conductive film, and the conductive layer of this transparent conductive film By providing an adhesive layer on the open surface that does not have a surface and bonding it with another transparent substrate via this adhesive layer, a member that has both the ability to transmit visible light and the ability to shield against static electricity and electromagnetic waves. It was found that the workability and scratch resistance during production were good, and the present invention was completed.

That is, this invention provides a transparent conductive layer on one side of a transparent film base material, a transparent adhesive layer on the other side, and adheres another transparent substrate via this adhesive layer. Related to static electricity and electromagnetic shielding materials.

[Structure and operation of the invention]

The transparent film base material used in this invention is as follows:
Any transparent film can be widely applied, such as polyethylene terephthalate (PET), polyimide (PI), polyether sulfon (PES), polyether ether keto 7 (PEEK), polycarbonate (PC), and polypropylene (PP). Plastic films having a thickness of about 5 to 300 μm, such as polyamide, acrylic, cellulose probione (CP), etc., are preferably used.

If the thickness of the film becomes too thin, the mechanical strength of the film will be insufficient, and if it becomes too thick, the film will lack flexibility. For example, the transparent conductive layer or It becomes difficult to form an adhesive layer. In addition, due to the lack of flexibility, when the transparent substrates are bonded together, floating phenomena and bubbles tend to occur between the two, which impairs adhesion, which is not preferable.

In this invention, the transparent conductive layer provided on one surface of the film base material is made of stannic oxide, indium oxide, titanium oxide, cadmium oxide, metallic indium, metallic tin, gold, silver, platinum, palladium, copper, etc. ,aluminum,
Made from nickel, chromium, titanium, iron, cobalt, copper iodide, or mixtures or alloys thereof,
The thickness may be changed as appropriate depending on the purpose, but in consideration of the use of this invention, etc., when the above oxide or a mixture thereof is used as a conductive layer, the thickness is 80 to 5,000, and the above metal or alloy is used as a conductive layer. 50-40 if layered
It is estimated that there are about 0 people.

If the conductive layer is too thin than the above range, the shielding property against static electricity and electromagnetic waves will be reduced due to defects in the film structure, and if it is too thick, the visible light transmittance will be reduced, both of which are not preferred.

The surface resistance of the conductive layer is preferably 10 9 Ω/hole or less when used for electrostatic shielding, and 10 3 Ω/hole or less when used for electromagnetic shielding.

Such a conductive film can be formed by a known thin film forming technique such as a vacuum evaporation method, a sputtering method, an ion blating method, a chemical vapor deposition method, a spray pyrolysis method, a chemical plating method, an electroplating method, or a combination thereof. Can be easily formed.

In this invention, the adhesive layer provided on one side of the film base material that does not have a conductive layer is not particularly limited as long as it has transparency (although it can be used, for example, acrylic adhesives are preferably used. The thickness of this adhesive layer is required to be at least 2 μm or more, and is usually 5 to 500 μm.

The thickness of this adhesive layer is an important element in the present invention. For example, if the thickness of the adhesive of the shielding material is less than 2 μm, it may be difficult to attach it to an apparatus equipped with the display device, etc. In such cases, the cushioning effect of the adhesive layer in the shielding material cannot be expected, leading to problems such as the conductive layer on the transparent film base material being easily damaged by pressing operations, and if it is too thick, the cushioning effect However, there are problems in that it is unfavorable in terms of visible light transmittance, workability, and cost.

The transparent substrate that serves as a carrier for the film base material provided with the conductive layer in this invention has a flat or curved shape, for example, a glass plate with a thickness of usually about 1 to 10 m, or a polycarbonate ( Transparent plastic plates such as PC), cellulose probione (CP), and acrylic are used.

Note that a transparent substrate may be constructed by laminating the above-mentioned glass plate and a plastic plate, and in this case, the glass plate, which is relatively brittle and easily broken, has an added effect of preventing scattering when broken.

FIG. 1 shows the structure of the static electricity and electromagnetic shielding material according to the present invention, in which 1 is a transparent film base material 2.
3 is a transparent conductive layer provided on one surface of the film base material 2, and 3 is a transparent adhesive layer provided on the other surface of the film base material 2.

4 is a transparent substrate bonded to the film base material 2 via the adhesive layer 3.

Such a shielding material may be laminated so that the conductive layer 1 does not come into contact with each other in order to improve electromagnetic shielding properties, or may be laminated with the shielding material shown in FIG. As shown in FIG. 2, the conductive layers may be stacked so that their surfaces are in contact with each other.

In addition, anti-glare treatment is applied to the surface of the transparent substrate 4, that is, the surface of the substrate 4 is made uneven by molding, sand matting, coating, etc., which increases surface scattering and absorption of light, reduces surface reflection, and eliminates glare. The visibility of the substrate 4 may be further improved in this manner.

〔Effect of the invention〕

As described above, the static electricity and electromagnetic wave shielding material of the present invention has the functions of visible light transmission ability and static electricity and electromagnetic wave shielding ability, so it can be used as a window for devices equipped with display devices, etc. If it is used as a material, its transparency will make it easier to visually see the inside of the device, and it will have the special effect of shielding static electricity or electromagnetic waves generated from inside the device.

In addition, since the above-mentioned shielding material is constructed using a transparent film base material as described above, for example, a roll-shaped transparent film base material is used and a conductive layer or a conductive layer is continuously applied on the film base material. It is possible to form an adhesive layer,
and a film base material on which the conductive layer and the adhesive layer are formed,
It is also possible to bond the above transparent substrate together continuously.

Therefore, a dramatic improvement in work efficiency and productivity can be expected, and in addition to the above-mentioned excellent characteristics, the fabricated shielding material has good scratch resistance of the conductive layer due to the cushioning effect of the adhesive layer mentioned above. Therefore, it can be applied to a wide range of applications as an unprecedented static electricity and electromagnetic shielding material.

〔Example〕

EXAMPLES Below, examples of the present invention will be described in more detail. In addition, the following characteristic tests were conducted using the following method.

<Surface resistance> Measured using the 4-terminal method.

<Visible Light Transmittance> Transmittance at a wavelength of 550 nm was measured using a spectroscopic analyzer UV-240 (manufactured by Konsei Seisakusho Co., Ltd.).

<Static electricity shielding characteristics> Using a current collector type potential measuring device KS-325 model (manufactured by Kasuga Denki Co., Ltd.), a shielding material was installed (grounded) on the surface of a cathode ray tube (CRT) of a television, and the amount of static electricity on the surface of the shielding material (
(when the TV was on) was measured.

In addition, if no shielding material is installed, the voltage will be 40 to 50 kV.
It has an electrostatic potential of .

Electromagnetic shielding characteristics> Using an electromagnetic shielding effect measuring device TR-17301 (manufactured by Atopan Test Co., Ltd.),
The electric field shielding effect (dB) in Hz was measured.

Example 1 A transparent conductive layer with a thickness of about 6 μm was formed by sputtering on one side of a 75 μm thick PET film as a transparent base material.
00 ITOs (Inz 03:5noz=9:1
) was formed. Then, an acrylic adhesive layer having a thickness of about 20 μm was formed on the other side of the PET film that did not have the conductive layer. Next, an acrylic plate having a thickness of 2 mm was bonded to the above film via the adhesive layer to produce a static electricity and electromagnetic shielding material.

Example 2 A conductive layer made of Au was deposited on one side of the transparent substrate used in Example 1 using a vacuum evaporation method to a thickness of about 150 mm:
``An electrostatic and electrostatic (n-wave) shielding material was produced in the same manner as in Example 1, except that the 1119 layer was formed.

Example 3 Static electricity and electricity were removed in the same manner as in Example 1, except that a metal thin film layer made of Ag and having a thickness of approximately 180 mm was formed as a conductive layer on one surface of the transparent substrate used in Example 1 by vacuum evaporation. We created an electromagnetic shielding material.

The characteristics of each shield material produced in Examples 1 to 3 above were
Shown in the table.

The shielding materials according to Examples 1 to 3 shown in Table 1 and above were used for CRT, LC
A blue test was conducted by attaching it to the front of a D display, and it was confirmed that it not only provided good visibility, but also exhibited excellent shielding properties against static electricity and electromagnetic waves.

In addition, when manufacturing the shielding material, it is sufficient to simply bond the film base material provided with the conductive layer to a transparent substrate via the adhesive layer of the film base material, and the workability is good. Even when mounted on the front surface of the display, no scratches were observed, and the scratch resistance was also proven to be good.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the static electricity and electromagnetic wave shielding material of this invention, and FIG. 2 is a sectional view showing a state in which the shielding materials of FIG. 1 are laminated. 1... Transparent conductive layer, 2... Transparent film base material,
3...Transparent adhesive layer, 4...Transparent substrate Patent applicant: Nitto Electric Industry Co., Ltd. 11 items 2 Boxes: 1 x 1 2. Fue na 1 layer 4 convex moebun

Claims (1)

[Claims] (1) A transparent conductive layer is provided on one side of a transparent film base material, a transparent adhesive layer is provided on the other side, and another transparent substrate is bonded via this adhesive layer. Features static electricity and electromagnetic shielding material.