JPH11312892A - Electromagnetic shielding glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electromagnetic shielding glass, which is constituted in such a double-layered glass structure that the durability of the glass is improved and the deterioration of the electromagnetic shielding ability of the glass is prevented. SOLUTION: Two glass plates 1 and 11, respectively carrying transparent conductive films on at least their internal surfaces, are held in parallel at a prescribed interval by putting spacers 4 between the glass plates 1 and 11 and the peripheral edge sections of the glass plates 1 and 11 are sealed by respectively sticking conductive tapes 3 and 31 to the transparent conductive films 2 and 21 and the external surfaces of the glass plates 1 and 11 straddling across the end faces of the plates 1 and 11. In this case, the upper edges of the conductive tapes 3 and 31 on the external surface sides of the glass plates 1 and 11 are covered with waterproof tapes 6 and 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shielding glass having a double glazing structure or a double glazing structure, which is mounted on an opening of an intelligent building or the like.

[0002]

2. Description of the Related Art In recent years, electronic devices such as office automation (OA) and communication devices have become indispensable, and other electronic devices and electronic control devices may malfunction or generate noise due to electromagnetic waves generated by the devices and devices. In the age of advanced information technology, electromagnetic waves entering from window glass may cause electronic devices in buildings to malfunction or become a noise source, and electromagnetic waves coming out of window glass may be transmitted to external electronic devices. It is necessary to impart electromagnetic shielding performance to a window because it causes a malfunction or a noise source, and many applications in this field have been filed.

Among them, Japanese Patent Application Laid-Open No. Sho 64-5099 discloses a structure in which two sheet glasses are held at intervals by a spacer, the peripheral edge is sealed, and a transparent conductive film is disposed on the inner surface side of the sheet glass as a double-layer glass structure. Numerous applications have been filed.

Further, Japanese Unexamined Utility Model Publication No. 3-83996 for connecting a transparent conductive film formed on the inner surface to an external conductor has been proposed.

[0005]

In the case of a multi-layer glass structure, it is necessary to connect the transparent conductive film inside the sheet glass to an external conductive material and to ground the same.
No. 4-5099 is projected from the conductive layer such as a silver layer to the outside of the double glazing by a conductive mesh,
The connection structure with the external sash is not specified.

In Japanese Utility Model Application Laid-Open No. 3-83996, a transparent conductive film on the inner surface of a double-glazed glass and a conductive coating material integrally provided on the periphery of the double-glazed glass are electrically connected to each other. In order to intervene and arrange a conductive layer made of metal foil with an adhesive layer, but there is no consideration for intrusion of moisture,
Moisture penetrates from the periphery of the metal foil, deteriorating the silver layer etc. in the transparent conductive film, not only remarkably reducing the electromagnetic shielding performance, but also between the transparent conductive film on the glass inner surface and the conductive coating material. Oxidize the metal etc. of the conductive layer interposed in the
The resistance increased, and this also reduced the electromagnetic shielding.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic shielding glass that improves durability and prevents deterioration of electromagnetic shielding performance.

[0008]

According to the electromagnetic shielding glass of the present invention, two glass plates provided with a transparent conductive film on the inner surface of at least one of the glass plates are held at predetermined intervals by spacers, and In an electromagnetic shielding glass in contact with a transparent conductive film, and arranging a conductive tape over an end surface to a surface of the plate glass, and sealing two peripheral edges of the plate glass, an upper portion of the conductive tape on the plate glass surface side The edge portion is covered with a waterproof tape.

[0009] Further, it is preferable that the allowance for the inner surface of the glass of the conductive tape be 2 mm to 4 mm.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The electromagnetic shielding glass has a well-known double-layered glass structure in which two sheet glasses are held at a predetermined interval by a spacer and the peripheral edge is sealed. Ag and Z on inner surface of sheet glass
A transparent conductive film such as a composite film or an ITO film or a NESA film in which nO films are alternately formed by a method such as a sputtering method is provided.

The conductive tape is made by laminating a conductive adhesive containing carbon or the like on a metal foil of copper, aluminum, SUS, zinc or the like, or an insulating adhesive having a hole in the metal foil. Laminated ones and the like can be used.

Water-resistant tapes are made of vinyl chloride, polyester, polyethylene, cross-linked polyethylene, polypropylene, cloth, etc., and are made of synthetic rubbers such as butyl rubber and polyisobutylene, and synthetic resins such as acrylic resin. Can be used.

In particular, a butyl rubber tape using butyl rubber as an adhesive and a polyisobutylene tape using polyisobutylene as an adhesive are preferable because of their excellent moisture resistance. Regarding the connection structure of the conductive film of the double-layer glass, as shown in the example, a conductive tape is disposed so as to contact the transparent conductive film and extend from the end surface to the surface of the sheet glass, and the upper edge portion of the conductive tape is waterproof. What is necessary is just to coat | cover with a conductive tape, and conduction | electrical_connection with the further outer conductive material to a sash etc. is performed by inserting a wire mesh etc. between this conductive tape and a conductive material.

Further, as shown in the second embodiment, on the outside of the double-glazed conductive tape of the first embodiment, as shown in FIG.
In the same manner as in the structure of No. 96, a structure may be adopted in which a conductive coating material is covered and a wire mesh or the like is interposed so as to conduct the conductive coating material and an external conductive material. The upper edge portions of both the conductive tape and the conductive coating material may be covered with a waterproof tape.

According to the present invention, since the upper edge of the conductive tape is covered with the water-resistant tape, the penetration of moisture can be completely prevented, and as a result, the transparent conductive film disposed on the inner surface of the double-glazed glass can be prevented. In addition to eliminating the influence on the film, it is possible to prevent the conductive tape from being oxidized with metal and the like, and to prevent the electromagnetic shielding performance from being lowered.

[0016] Further, by setting the indentation of the inner surface of the plate glass of the conductive tape in the range of 2 mm to 4 mm, sufficient electromagnetic shielding performance can be secured without deteriorating the adhesion between the plate glass and the sealing material.

Further, a conductive tape may be coated on the outside of the water-resistant tape to increase the contact area of the conductive portion.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. 1 and 2 are cross-sectional views of main parts showing an electromagnetic shielding glass according to a first embodiment of the present invention, and a main part cross-sectional view showing an electromagnetic shielding window to which the electromagnetic shielding glass is applied. FIG. It is principal part sectional drawing which shows glass.

Embodiment 1 As shown in FIGS. 1 and 2, an electromagnetic shielding glass in which a transparent conductive film is formed on the inner surface of both of the double-glazed glass sheets and is electrically connected to the outside by a conductive tape having a U-shaped cross section element. Is exemplified.

A composite film or an ITO film in which Ag and ZnO films are alternately formed by a method such as a sputtering method on the inside of both of the two glass sheets 1 and 1 ′,
A transparent conductive film 2, 2 'such as a NESA film is provided. Further, conductive tapes 3, 3' having a U-shaped cross section, such as an adhesive copper tape, are provided on the periphery of the four sides of each sheet glass, and the inside thereof is covered. The transparent conductive film 2 and the conductive tape 3 are conducted.

Next, the two glass sheets covered with the transparent conductive film and the conductive tape are held at a predetermined interval by the spacer 4, and the peripheral portion is sealed with the sealing material 5.
Further, a butyl rubber tape in which a butyl rubber-based adhesive is laminated on a base material such as vinyl chloride so as to cover the upper edge portions of the conductive tape on both sides of the double-glazed glass is used as the water-resistant tapes 6 and 6 ′. The tape is adhered to the surface of the glass sheet 1 so as to be in contact with the upper edge of the tape.

The thus obtained electromagnetic shielding double-glazed glass was subjected to a weather resistance test specified in JIS R 3209, and it was confirmed that sufficient weather resistance was obtained. When the thus obtained electromagnetic shielding glass is fitted into a sash 7 made of aluminum or the like, a conductive coating material 8 such as aluminum foil is covered on the sash 7 and the ridge 9 is removed. , Set the setting block 10,
Thereafter, one backup material 11, for example, foamed rubber is adhered to the sash 7 with a double-sided adhesive tape (not shown) over the entire circumference of four sides.

Next, after fitting the electromagnetic shielding glass and attaching the ridge 9, the other backup material 11 'is inserted. Then, for example, Monel,
A metal conductor 12 having a mesh structure formed by braiding a metal wire such as tin-plated copper, iron, or aluminum is fitted therein, and sealed with silicone-based sealing materials 13 and 13 'to complete the electromagnetic shielding window.

Example 2 As shown in FIG. 3, both sheets of double-glazed glass 1,
Transparent conductive films 2 and 2 'are formed on the inner surface of 1', and are electrically connected to the outside by conductive tapes 3 and 3 'of U-shaped cross-section elements. In this case, the waterproof covering material 14 is further adhered so as to cover the outside of the conductive tapes 3 and 3 ′. What is necessary is just to adhere | attach so that an upper edge part may be covered.

It was confirmed that the thus obtained electromagnetically shielded double glazing also had the same weather resistance as in Example 1.

[0026]

According to the electromagnetic shielding glass of the present invention, the weather resistance can be improved and the electromagnetic shielding performance can be prevented from lowering with a simple structure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of an electromagnetic shielding glass according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing an electromagnetic shielding window to which the electromagnetic shielding glass of Example 1 is applied.

FIG. 3 is a cross-sectional view illustrating a main part of an electromagnetic shielding glass according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Sheet glass 2, 2' Transparent conductive film 3, 3 'Conductive tape 4 Spacer 5 Sealing material 6, 6' Water-resistant tape 7 Sash 8, 14 Conductive coating material 9 Edge 10 Setting block 11, 11 'Backup Material 12, 12 'Metallic conductor 13, 13' Sealing material

Claims (2)

[Claims] At least one of two glass plates provided with a transparent conductive film on an inner surface of a glass plate is held at a predetermined interval by a spacer, is brought into contact with the transparent conductive film, and is placed on an inner surface of the glass plate from an end surface thereof. In an electromagnetic shielding glass in which a conductive tape is disposed over the surface and the peripheral edges of two glass sheets are sealed, an upper edge portion of the conductive tape on the surface of the glass sheet is covered with a water-resistant tape. Electromagnetic shielding glass characterized by the following. 2. The electromagnetic shielding glass according to claim 1, wherein an indentation of the inner surface of the glass of the conductive tape is 2 mm to 4 mm.