JPH11354980A - Plastics-made light-permeable electromagnetic wave shield filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid warpage of a plastic light-permeable electromagnetic wave shield plate due to generated heats by connecting one end of an expandable conductive material to a surface conductive electromagnetic wave shield layer on the peripheral end face and surface of the shield plate and fixing the other end to a conductive frame. SOLUTION: The four sides of a plastic light-permeable electromagnetic wave shield plate, which is vacuum deposited with In oxide-Sn (ITO) 2 on an acrylic resin board 1, are fixed to an Al alloy sash structure 3 with expansion/ shrinkage allowances, the Al alloy sash structure 3 and ITO metallizing surface 2 are made conductive through a Cu foil tape 5 with conductive adhesives such that the Cu foil tape 5 is pasted with a slack enough to follow up the expansion/shrinkage of the plastic light-permeable electromagnetic wave shield plate due to the environmental change, and the plastic light-permeable electromagnetic wave shield plate is a metal thin film of Ag, Au etc., or a transparent metal oxide of In oxide, etc., sheeted directly on the entire surface or part of a transparent resin board of acrylic resin, polystyrene resin, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic transparent electromagnetic wave shield filter which can be used on an information display surface of an information communication device or the like which is affected by an environmental change due to heat or the like during use.

[0002]

2. Description of the Related Art On an information display surface of an information communication terminal or the like, there has conventionally been a demand for a transparent electromagnetic wave shield plate that transmits visible light as information and does not transmit unnecessary electromagnetic waves.

As the transparent electromagnetic wave shielding plate, a transparent electroconductive film such as silver or ITO (indium tin oxide) or a conductive fiber component supported by a transparent substrate such as glass or plastic has been used. However, when glass is used as the base material, there are problems such as breakage of the base material due to impact, and injuries to the operator due to the breakage, and plasticization has been desired.

However, from the viewpoint of the influence of heat generated by the equipment used on the substrate, the coefficient of linear expansion of glass is about 0.1.
Since it was as low as 9 × 10 ^-5 (° C. ^-1 ), the problem of warping due to expansion of the base material did not occur even if the periphery was fixed with a ground electrode, but a plastic base material such as an acrylic plate was replaced with a glass base material. When fixed by the same method, for example, in the case of an acrylic resin, the coefficient of linear expansion is as large as 7 × 10 ⁻⁵ (° C. ⁻¹ ).

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plastic light-transmitting electromagnetic wave shielding filter which does not warp a substrate due to heat or the like generated during use of an attached device.

[0006]

The gist of the present invention is that one end of an extendable conductive material is connected to a peripheral end face of a plastic light transmitting electromagnetic wave shielding plate and / or a conductive electromagnetic wave shielding layer on the peripheral surface, There is a plastic light-transmitting electromagnetic wave shielding filter in which the other end of the stretchable conductive material is fixed to a conductive frame.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Plastic translucent electromagnetic wave shielding plates which can be used in the present invention include:
An acrylic resin plate, a polystyrene resin plate, a polycarbonate resin plate, a transparent resin plate such as a polyvinyl chloride resin plate, or the like, a metal thin film such as silver, gold, copper, and aluminum and / or indium oxide, An example is a material in which a transparent conductive metal oxide thin film such as tin oxide or zinc oxide is directly formed. Further, a transparent resin film having the metal thin film and / or the metal oxide thin film formed thereon may be attached to the surface of the transparent resin plate, or may be sandwiched between the transparent resin plates. is there. Further, a conductive knitted fabric, such as a metal fiber knitted fabric or a polyester fiber knitted fabric plated with metal, is integrated with the transparent resin plate by a method such as thermocompression bonding or adhesive bonding. It is possible.

As the stretchable conductive material connected to the plastic light-transmitting electromagnetic wave shielding plate, a stretchable metal structure such as a metal coil can be used. Even if the material itself, such as a tape, is a film-like metal having extremely low elasticity, it can be used by attaching it with a slack so that it can expand and contract at the time of installation.

As the material of the conductive frame for fixing the plastic translucent electromagnetic wave shielding plate, any conductive material such as a metal material such as aluminum or a metal-plated plastic material can be used.

The shape of the conductive frame can be any shape as long as it does not hinder the expansion and contraction of the plastic light-transmitting electromagnetic wave shielding plate. 1-2 of the length of one side of the shield plate
% Expansion and contraction allowances are required. This expansion,
The shrinkage allowance is appropriately adjusted depending on the linear expansion coefficient, the water absorption expansion coefficient, and the use environment of the plastic translucent electromagnetic wave shielding plate used.

In the present invention, the conductive frame can be used as a part of a casing of a plasma display device. Further, the conductive frame can be mounted on the plasma display device.

[0012]

The present invention will be described below with reference to examples. Example 1 Four sides of a plastic light-transmitting electromagnetic wave shielding plate in which ITO (indium tin oxide) 2 was vacuum-deposited on an acrylic resin plate 1 were converted into an aluminum alloy sash structure 3 as shown in FIG. The aluminum alloy sash structure 3 and the ITO vapor-deposited surface 2 were electrically connected to each other by a copper foil tape 5 with a conductive adhesive. At this time, the copper foil tape 5 was attached with a slack so as to be able to follow expansion and contraction due to environmental changes of the plastic translucent electromagnetic wave shielding plate. 2 and 3, reference numeral 4 denotes an expansion / contraction allowance provided between the aluminum alloy sash structure 3 and the plastic light-transmitting electromagnetic wave shielding plate.

[0013] This electromagnetic wave shielding filter is -20 ° C.
After 3 hours in the environment, the temperature was raised to 80 ° C in 1 hour and increased to 80 ° C.
After 10 hours of cooling / heating cycle test in which the temperature was lowered to −20 ° C. in 1 hour after being left for 3 hours, no bending or warping was observed in the plastic translucent electromagnetic wave shielding plate during and after the test. Was.

[0014]

According to the present invention, the plastic light-transmitting electromagnetic wave shielding plate can be suitably used without causing warping or bending due to heat or the like generated by the attached device.

[Brief description of the drawings]

FIG. 1 is a plan view of a plastic light-transmitting electromagnetic wave shielding plate fixed to an aluminum frame by a copper foil tape with a conductive adhesive.

FIG. 2 is a sectional view taken along line XX ′ of FIG. 1;

FIG. 3 is a sectional view taken along line YY ′ of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Acrylic resin plate 2 ITO vapor deposition surface 3 Aluminum alloy sash structure 4 Expansion and shrinkage allowance 5 Copper foil tape with conductive adhesive

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akira Kogame 3816 Noborito, Tama-ku, Kawasaki City, Kanagawa Prefecture Mitsubishi Rayon Co., Ltd. Tokyo Technology and Information Center

Claims (3)

[Claims] An end of an extendable conductive material is connected to a peripheral end face and / or a conductive electromagnetic shield layer on a peripheral surface of a plastic light-transmitting electromagnetic wave shield plate, and the other end of the extendable conductive material is provided. Is a plastic light-transmitting electromagnetic wave shielding filter fixed to a conductive frame. 2. The plastic light-transmitting electromagnetic wave shielding filter according to claim 1, wherein the conductive frame is a part of a casing of the plasma display device. 3. A plasma display device equipped with the plastic light-transmitting electromagnetic wave shielding filter according to claim 1.