JPS62147799A - Light transmitting plate with electromagnetic wave shieldingproperties - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a plastic light transmitting plate having electromagnetic shielding properties and static electricity removal properties. Furthermore, the present invention relates to a light transmitting plate that can effectively block harmful electromagnetic waves generated from displays, television sets, etc., and can also effectively remove static electricity.

[Prior art]

Office automation equipment, such as the displays of word processors and various computers, game consoles, and television cathode ray tubes, generate a large amount of harmful electromagnetic waves such as microwaves, which can cause health problems and may also be transmitted to other equipment. obstacles are becoming a problem. For example, it is often seen that a computer receives a false signal, or that when a TV and stereo are turned on at the same time, noise can be heard from the stereo.

Therefore, various improvements have been made to eliminate such obstacles. An effective means is to cover it with a conductive material such as metal. For example, a mesh structure made by adhering carbon to the surface of thin fibers is pasted, or polyester fibers are covered with a mesh made of fibers with a thin nickel film (trade name: Soft Wave, manufactured by Aster International Co., Ltd.). There are products that incorporate thin metal wires inside laminated glass, such as Chori Co., Ltd.'s product name "Paai Sapper".

However, all of these methods have the disadvantage that the light emitted from the display is blocked by the mesh groove structure, making it difficult for users of word processors and the like to see the display. As another known example, a technique has been proposed in which a conductive material is vapor-deposited at high temperature on a glass substrate (Japanese Patent Publication No. 18447/1983), but with this method, the plastic substrate softens or melts. Moreover, the disadvantage that the surface is easily scratched cannot be improved and cannot be used.

Therefore, there is no effective technology for plastic transparent plates, and no improvements have been made at present.

[Problems to be Solved by the Invention] The present invention provides a technique for improving the drawbacks of the above-mentioned prior art. In other words, the present invention provides a technology that can shield electromagnetic waves even if it is a transparent plastic plate by coating its surface with a conductive layer, and can effectively remove microwaves and static electricity using a ground wire. In other words, the present invention provides a technology that not only prevents the generation of harmful radio waves but also prevents static electricity and prevents the adhesion of dust and dirt.

Specifically, the present invention provides a technology that increases the hardness of plastic materials by providing a silica layer on the surface of the plastic material, thereby making it less likely to be scratched. In addition, the present invention provides a technology that provides an antireflection function by providing a layer with a low refractive index on the surface layer of the conductive layer.

(Means for solving problems) In order to achieve the above object, the present invention has the following structure.

``Plus Deck'' is an optical system in which a hard coat layer with abrasion resistance is provided on a transparent substrate, a conductive layer is provided on the surface layer, and a layer with a refractive index lower than the refractive index of the conductive layer is further provided on the surface layer. A light transmitting plate having electromagnetic wave shielding properties, characterized in that at least a part of the light transmitting plate has the conductive layer exposed and has a groove extending from the conductive layer to a ground wire. In the present invention, it is first necessary to provide a hard coat having abrasion resistance on the plastic transparent base material. Here, the plastic may be any known plastic. Further, the transparent material may be any material as long as light can pass therethrough. When used on the front of a display such as a lead display, the visible light transmittance can be increased from 25 to 25% by coating or dyeing.
Preferably it is 70%. This is to reduce eye fatigue. In addition, the hard law 1 to layer with extenuating effect is
A coating layer with high hardness such as polyorganosiloxane, silica, alumina, or a layer containing an acrylic component. The surface of Plus Deck products is generally prone to scratches, so this is to improve this, and to increase the adhesion of the electromagnetic shielding layer coated on the surface. Particularly preferably, the hard layer 1 is a polyornosiloxane coated with methyltrimethoxysilane, vinyl 1-1-oxysilane, or a hydrolyzate of 1 or 1 of these and subjected to heat condensation.

The preferred thickness of one hard layer is 1 to 10 μm.
It's okay.

Moreover, the acrylic Bartco-1 single layer refers to one in which an acrylic compound such as methacrylic acid and a polyfunctional glycol such as pentaerythritol or glycerin or an ester compound thereof are bridged.

Next, in the present invention, a conductive layer is provided on the surface layer of the hard coat layer. This is to effectively block electromagnetic waves.

The conductive layer may be of any material as long as it can transmit visible light, but is preferably Ir120.
It is a mixture (hereinafter referred to as ITO) of 3 (indium oxide) and 5n02 (tin dioxide). This is because it has high conductivity, can effectively block electromagnetic waves, and can roughly transmit visible light. The thickness of the ITO layer may be any thickness as long as it achieves this effect, but is preferably '1'.
There are 00 to 3000 people. If the thickness is 3000 Å or more, defects such as cracks are likely to occur. Such an ITO layer can be coated by sputtering. (As a method for 1!!, it is also possible to employ a technique in which vapor deposition is performed using plasma generated by high-frequency discharge in an oxygen atmosphere at 150'C or lower, and at the same time, an ion gun is used to assist.

Next, in the present invention, it is necessary to provide a layer with a refractive index lower than that of the conductive layer on the surface layer of the conductive layer.Since the conductive layer is generally made of a metal layer, the refractive index is For example, the refractive index of the ITO layer is about 2.0.However, this is too high and causes eye strain for the user.Therefore, a layer with a low refractive index is provided on the surface of the conductive layer with a high refractive index. Therefore, it is necessary to provide an anti-reflection function.

Such a low refractive index layer may be any known layer, but is preferably a layer containing organic silica.
Alternatively, vacuum deposition can be used. The film may have any thickness as long as it can prevent reflection of visible light.

In the present invention, the above lamination is applied to one of the plastic base materials.
Provided on one side or two sides. If it is provided on one side, it is preferable to provide at least the first layer of hard coat as described above in order to prevent scratches on the opposite side. It is about providing layers.

Next, in the present invention, it is necessary that at least a part of the light transmitting plate has an i-structure in which the conductive layer is exposed and a ground wire is drawn out from the conductive layer. This is to prevent the light transmitting plate from being charged and remove static electricity. The conductive layer can be efficiently exposed by guarding only that portion when forming the antireflection layer so that the antireflection layer is not coated.

The exposed portion of the conductive layer is preferably provided at a corner of the light transmitting plate and at a portion covered by the outer frame cover so as not to interfere with the display of images and characters on the display. Further, from an aesthetic point of view, it is preferable that the lead-out portion of the ground wire be provided approximately parallel to the surface of the light transmitting plate.

This will be explained below with reference to the drawings.

FIG. 1 shows a cross section of one embodiment of a light transmitting plate having preferable electromagnetic wave shielding properties and static electricity removal properties according to the present invention. Hardware with abrasion resistance on plastic transparent base material 1]
-1. A layer 2 is provided, a conductive layer 3 is provided on the surface layer, and a layer 1 having a refractive index lower than the refractive index of the conductive layer is further provided on the surface layer.
It has been established. A heart coat layer 2- and an anti-reflection layer 4- having abrasion resistance are also provided on the opposite side. 5 is required at the exposed portion of the conductive layer. The surface having the conductive layer 3 is an image generation surface, that is, a cathode ray tube (CRT).
Place it facing the surface such as J: Sea urchin.

FIG. 2 is a plan view seen from the side having the conductive layer 3 of FIG. The exposed portion 5 of the conductive layer may be provided on the entire surface of the portion hidden by the outer frame, or may be provided on a portion thereof. Then, pull out the ground wire 6. The ground wire 6 is preferably drawn out from a corner portion. Figures 3 to 7 show preferred examples of the ground wire of the present invention. At a3 in FIG. 3, a hole 9 is provided in the light transmitting plate itself, and a ground wire 15 is connected using the remainder 5a. Preferably, a metal backing is used in this connection. Set screw 10a as a fixture
It is preferable to fix it using a nut 10b or a caulking eyelet. FIG. 4 shows a fixing method using crimping eyelets. This entire connection is covered with a plastic cover 11 for aesthetic reasons. FIG. 5 shows an example in which the metal fitting 6a is attached inside the cover 11 approximately parallel to the light transmitting plate.

Next, FIG. 6 shows an example in which a nut helical insert 12 is used in the hole 9, and a ground wire 15 is attached via a metal fitting 6a. In this case, since the holes 11a are formed in the cover 11 in advance, the screws 13 can be easily removed, which is convenient when removing and cleaning the light transmitting plate.

Figure 7 shows the adjustment 14a114 for removing the shield.
This is an example carried out using b.

(Example〕 This will be explained below using examples.

Example 1 A commercially available polymethacrylate plate (manufactured by Mitsubishi Rayon Co., Ltd., trademark "Aqualite" LN-08/I, gray spun-dyed, thickness approximately 2 mm) was used as a base material. Bartco-1~
As a coating material, as described in Example 1 of JP-A-59-114501, a mixture of vinyltriethoxysilane hydrolyzed with glacial acetic acid and medyltriethoxysilane hydrolyzed with glacial acetic acid was used. It was used as Sodium acetate, which is a curing agent, was added to this mixed solution, and a silicone-based surface smoothing agent was added to the coating to prepare a paint.

Apply this coating 1 to the surface of base H to a thickness of 2 microns,
Heat cured.

Next, on this hard coat layer, In203 (indium oxide) and 5n0 are deposited as a conductive layer using a sputtering method.
2 (tin oxide) and coated with a mixture of 700
The film thickness was taken as human film thickness. The sputtering method conditions are as per JP-A-6
It is described in Examples 7 to 9 of Publication No. 0-32053, and indium-tin alloy (tin: 10ffi maximum%)
Using a magnetron sputtering device as a target, a mixed gas of argon gas and oxygen (oxygen 30% by volume)
was carried out at a pressure of I x 10'Torr while introducing.

Next, as an anti-reflection film, a silicon dioxide film was formed by the EB method using a vacuum evaporator (model BMC-800T manufactured by Shinku Kaigoki Kogyo). The film thickness was 940 people. When performing vacuum deposition, a mask was set at the position shown in number 5 in FIG. 2, that is, around the circumference with a width of about 5 mm, and the conductive layer was exposed.

In addition, on the opposite side of the base material, the above hard coat layer is provided,
Next, aluminum oxide and silicon dioxide films were sequentially formed to harden the surface and provide antireflection properties.

The obtained plastic coated light transmitting plate is
A ground wire was attached as shown in Figure 3. This light transmitting plate has a transmission amount of electromagnetic waves of approximately 10 at a frequency of 10 GH2.
We were able to attenuate it by a factor of 1. Furthermore, when this was used as an optical filter for a word processor, it had an excellent anti-reflection function and had a remarkable effect on the user's eyes from getting tired. It also removed static electricity, making it difficult for dust and dirt to accumulate. Ta.

In addition, the surface had high hardness and was resistant to scratches.

(Effects of the Invention) Since the present invention is a technology as described above, even if it is a transparent plastic plate, static electricity can be removed by coating the surface with a conductive layer, and dust and dirt can be prevented from being collected. I was able to figure it out. In addition, it can shield electromagnetic waves, and even for plastics with low surface hardness, a hard coat layer can be added to the surface to increase the VF rating and make it less likely to be scratched. hand,
By providing a layer with a low refractive index on the surface layer of the conductive layer, it is possible to improve not only scratch resistance but also anti-reflection, and the overall effect is outstanding. It is.

[Brief explanation of drawings]

FIG. 1 shows a cross section of one embodiment of a light transmitting plate having preferable electromagnetic shielding properties of the present invention. FIG. 2 is a plan view taken from the surface of FIG. 1 having the conductive layer 3. FIG. FIGS. 3 to 7 show preferred examples of taking out the ground wire of the present invention. 1; Plastic transparent base; 2.2-; Hard coat layer having abrasion resistance; 3; Conductive layer; 4.4-; Refractive index of conductive layer J: Layer with a very low refractive index. 11: Cover 15; Earth wire patent applicant Higashishi Co., Ltd. Company Examination 10
Number 20 Treasure 3 14Q House 1 Collection 60 Lua 0

Claims (8)

[Claims] (1) A hard coat layer having abrasion resistance is provided on a plastic transparent base material, a conductive layer is provided on the surface layer, and a layer with a refractive index lower than the refractive index of the conductive layer is further provided on the surface layer. A light transmitting plate having electromagnetic shielding properties, characterized in that the conductive layer is exposed in at least a part of the light transmitting plate, and a ground wire is drawn out from the conductive layer. Board. (2) The electromagnetic wave shield according to claim (1), wherein the exposed portion of the conductive layer is provided in a corner of the light transmitting plate and in a portion covered by the outer frame cover. A light transmitting plate with properties. (3) The lead-out portion of the ground wire is provided approximately parallel to the surface of the light transmitting plate.
1) A light transmitting plate having electromagnetic wave shielding properties as described in item 1). (4) A light transmitting plate having electromagnetic wave shielding properties as set forth in claim (1), wherein the conductive layer is a layer containing indium oxide and tin oxide. (5) A light transmitting plate having electromagnetic wave shielding properties as set forth in claim (1), wherein the hard coat layer is a layer containing organic polysiloxane. (6) A light transmitting plate having electromagnetic wave shielding properties as set forth in claim (1), wherein the transparent base material is colored. (7) A light transmitting plate having electromagnetic wave shielding properties as set forth in claim (1), wherein the thickness of the conductive layer is in the range of 100 to 3000 Å. (8) A light transmitting plate having electromagnetic wave shielding properties according to claim (1), wherein the outermost layer having a low refractive index is an inorganic silica layer.