JPH05243784A - Electromagnetic wave shielding laminated panel - Google Patents

Abstract

(57) [Summary] [Objective] To provide an electromagnetic wave shielding combined panel excellent in light transmittance and electromagnetic wave shielding performance. [Structure] An electromagnetic wave shielding film is provided on at least one side of a mating surface of two panel base materials, and each of the panel base materials is a bonding material arranged in the vicinity of its four peripheral ends so that the electromagnetic wave shielding film is inside An electromagnetic wave shielding laminated panel in which the four edges of the glass are covered with a conductive foil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in the field of using electronic computers and electronic component-using equipment, prevents the radio wave signals generated from those equipment from leaking from the room, and protects those equipment from the outside of harmful radio waves. The present invention relates to a panel such as a window glass for construction used when it is necessary to prevent intrusion.

[0002]

2. Description of the Related Art Heretofore, an electromagnetic wave shielding room for installing a precision electronic measuring instrument or the like has conventionally been covered with a metal plate or a metal foil. For windows in computer rooms and the like, laminated glass sandwiching a metal-coated net and double-layer glass using glass coated with a conductive oxide are used.

In order to shield electromagnetic waves, it is necessary to cover the object with a conductive material. If metal foil or the like is used as the material, the shielding performance is good, but the light outside the room cannot be taken in, and the room cannot be seen from outside.

The above glass was tried to solve this point, but in the laminated glass sandwiching the metal-coated net, the net interferes and the image on the other side of the glass is clearly visible. Absent. Further, when the conductive oxide is coated, the image is clearly visible, but in order to obtain the required performance, it is necessary to make the coating thick and there is a problem that the light transmittance is deteriorated.

Further, conventionally, as an electromagnetic wave shielding laminated panel of this type, a conductive net is interposed between two glass plates, the conductive net is extended from between the glass plates, and the surface side of one glass plate is provided. It is known that it is folded back and its surface is covered with copper channels. (Actual development 64
However, in the above-mentioned conventional electromagnetic wave shielding laminated panel, the conductive net interferes,
The image on the other side of the glass cannot be clearly seen through the glass.

[0006] Further, there is a problem in securing stable performance because variations easily occur due to individual differences among workers during construction.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic wave shielding laminated panel which has excellent characteristics of electromagnetic wave shielding and light transmittance and ensures stable performance.

[0008]

The structure of the present invention for solving the above-mentioned problems is an electromagnetic wave shielding laminated panel as set forth in the claims.

More specifically, the present invention relates to a metal film of at least 120 Å or more as a transparent conductive film in an electromagnetic wave shielding film, and an electric conductor between the metal film and another member.
It is a laminated glass using a simple metal or a material coated with a metal. For example, a glass panel having an electromagnetic wave shielding film on a glass substrate is combined.

Explaining with reference to the drawings, as shown in FIG. 5, a glass panel having an electromagnetic wave shielding film 4 composed of a transparent protective film 2, a metal film 3 and a transparent conductive protection 2 on one surface of a panel substrate 1 is combined. is there. As the above-mentioned transparent protective film, ITO, InO _X, SnO _X, it can be used BiO _X etc., as the metal film, gold, silver, copper or the like can be used.

FIG. 1 shows a panel in which the above two panels are combined with the electromagnetic wave shielding film 4 inside.

The laminated material 5 in the drawing is an organic material having elasticity and adhesiveness, which is used to combine the ends of two sheets of glass to form a certain distance between the two sheets of glass. Butyl rubber may be used as an example material.

The filler 6 is used to prevent deterioration of the electromagnetic wave shielding film, and is an inert gas, an organic material or the like, and specific examples thereof include Ar or methamethyl acrylate resin.

The function of the connecting agent 7 is an elastic body which makes the electric contact between the body and the conductive foil of the glass unit uniform.
A specific material is neoprene foam.

The action of the bonding agent 8 is a conductive sealing material, and a specific material is a sealing material containing silver-coated plastic particles.

The function of the conductive foil 9 is to provide a uniform electrical contact between the electromagnetic wave shielding film and the body.
Specifically, there are copper foil and aluminum foil.

FIG. 2 shows another example in which the bonding material 8 is replaced with a sealing material containing plastic particles coated with silver and a metallic sealing material (indium) is used. Further, the bonding material may be completely filled as shown in FIG.

FIG. 3 shows an example in which the bonding material 8 is interposed between the joining material and the conductive foil only by the glass surface, and the material and the like are the same as in FIG.

FIG. 4 shows an example in which the bonding material 8 is formed of a conductive foil, and the respective glass end portions are once covered, and the coated surfaces are further covered with the conductive foil. Further, unlike FIGS. 1 to 3, the glass surface is provided with an electromagnetic wave shielding film, and only one glass surface may be used as long as it is a relatively thick film.

As the transparent protective film, ITO or InO is used.
_X , SnO _X or BiO _X can be mentioned, and the metal group film can be a thin film of silver, gold, copper or the like, which can be coated on glass as a metal film alone or as a laminated film with other oxides. To be done. In addition, as an electrical conductor between the metal film and other members, there is a sealing material containing copper foil, indium, and metal-plated plastic particles, and the purpose can be achieved by using these materials alone or in combination of plural materials. You can

The transparent protective film or metal film of the present invention can be manufactured by a physical vapor deposition method such as a sputtering method or a vacuum deposition method.

On the other hand, as a method for attaching an electric conductor, in the case of a copper foil, when a conductive adhesive is provided on one surface, it can be directly attached to the transparent protective film. In addition, for copper foil without adhesive, it is possible to bond with indium. At this time, in order to prevent defective adhesion due to the oxide film of indium, use a soldering iron that can give ultrasonic vibration. There is a method of bonding in an inert atmosphere.

The sealing material containing the metal-plated plastic particles can be directly applied to the transparent protective film, and there is also a method of covering the periphery with a copper foil to protect the sealing material.

The present invention will be specifically described below with reference to examples.

[0025]

Example Preparation of a single panel A cleaned glass was placed facing a plurality of ITO and silver targets in a sputtering apparatus. Among the voltages extracted from the power supply for sputtering, the target is wired so that a negative voltage is applied, and a negative electrode is applied during coating, while a positive voltage is
It is grounded. A sputter apparatus container is used as the other electrode, and the container is grounded similarly to the positive voltage of the sputtering power source.

After the inside of the sputtering apparatus was evacuated by a vacuum pump, argon gas was supplied into the apparatus so that the gas pressure inside the apparatus was 0.1 mmbar. In that state, a voltage of 3000 volt was applied to the ITO, and sputter deposition was performed for 20 times.
It was done for a minute. Next, 2700 volt was applied to silver, and sputter deposition was performed for 5 minutes. Next, again to ITO 3
A voltage of 000 volt was applied and sputter deposition was performed for 30 minutes.

Preparation of Laminated Panel By the above method, the coated glass was cut to a predetermined size and then washed, and indium was coated on the coated surface for 5 mm from each end of the glass with an ultrasonic soldering iron to a thickness of 5 mm. Was set to be 0.2 mm. Similarly, another glass of the same size was treated.

Then, a string-shaped butyl rubber containing a 1 mm string as a core material is continuously arranged at a position approximately 7 mm from each side end of the coated surface of one glass except for one arbitrary position. After that, combined with other glass. At this time, the coating surfaces are assembled so as to face each other. The side edges of the combined glass thus obtained were pressed, and the gap between the two facing glasses was set to 1 mm to 1.2 mm. Next, the acrylic adhesive was poured into the gap between the facing glasses through the gap to which butyl rubber was not attached, and after the predetermined amount was injected, the through-portion was sealed with butyl rubber. The injected adhesive is 2 at room temperature with the sealed glass horizontal.
By holding for 4 hours, the glass can be hardened and the hardened glass becomes a laminated glass having a uniform thickness.

Next, using a copper foil tape having a thickness of 0.1 mm and a width of 20 mm, each end of the one surface has a width of 5 mm and a thickness of 1 mm.
Indium was thinly adhered to the central part of the surface having the elastic neoprene foam by an ultrasonic soldering iron.

With respect to the copper foil prepared in this manner, the surface having indium is placed continuously on each side edge of the above-mentioned laminated glass with the glass side facing away from the surface of the copper foil tape having the indium. By heating with an ultrasonic soldering iron from the surface of (1), good adhesion was obtained and uniform electrical contact with the glass was provided.

Further, the copper foil was bent along the glass surface to give an appropriate flexibility between the copper foil and the glass.

The evaluation is based on the electromagnetic wave shielding performance, KEC
(Kansai Electronics Industry Promotion Center) method, visible light transmittance was measured according to JIS R 3106 (plate glass transmittance / reflectance / solar heat gain test method).

The obtained glass electromagnetic wave shielding performance is as shown in FIG. This FIG. 6 shows the electric field shielding performance. That is, it shows how much the electromagnetic waves of the frequencies shown on the horizontal axis are shielded. The vertical axis represents the shielding ability.

More specifically, the panel material of the present invention is 800
It blocks the electromagnetic wave of MHz (38 dB), which is 1 /
This means blocking up to 79%.

The vertical axis is 40 (dB) and is 1/100
Decays to.

At the vertical axis of 60 (dB), the attenuation is 1/1000.

The visible light transmittance was almost the same as that of the present invention, and the shielding performance was extremely high as compared with the same kind of glass that has been developed so far. The spectral characteristics of the produced glass are as shown in FIGS. 7 and 8, and the visible light transmittance is
It was 54%.

Further, in FIG. 6, the alternate long and short dash line shows the electromagnetic wave shielding performance of the structure shown in FIG. 1 which is not filled with the bonding material. It is understood that the interposition of the bonding material made of the agent makes it possible to obtain a laminated panel having more excellent electromagnetic wave shielding performance.

[0039]

As described above, the electromagnetic wave shielding laminated panel of the present invention has excellent characteristics of electromagnetic wave shielding and light transmittance,
It shows stable performance.

[Brief description of drawings]

[Figure 1]

[Fig. 2]

[Figure 3]

FIG. 4 is a schematic cross-sectional view showing the configuration of a specific example of the electromagnetic wave shielding laminated panel of the present invention,

FIG. 5 is a schematic cross-sectional view showing the configuration of a single panel used for producing the laminated panel of the present invention,

FIG. 6 is a graph showing the electromagnetic wave shielding effect of the laminated panel of the example,

FIG. 7 is a graph showing the spectral characteristics of the glass panel of the present invention,

FIG. 8 is a partially enlarged view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel base material 2 Transparent protective film 3 Metal film 4 Electromagnetic wave shielding film 5 Composite material 6 Filler 7 Connecting material 8 Joining material 9 Conductive foil

Claims (4)

[Claims] 1. An electromagnetic wave shielding film is provided on at least one side of a mating surface of two panel base materials, and each of the panel base materials is arranged in the vicinity of its four peripheral ends so that the electromagnetic wave shielding film is inside. An electromagnetic wave shielding laminated panel, characterized in that it is connected by an adhering material and the four edges of the glass are covered with a conductive foil. 2. The electromagnetic wave shielding laminated panel according to claim 1, wherein a bonding material made of a metal-based sealing agent or an organic-based sealing agent is interposed between the bonding material and the conductive foil. 3. The electromagnetic wave shielding laminated panel according to claim 1, wherein a flexible connecting member having a thickness of 0.5 to 1.5 mm is interposed between the panel base material and the conductive foil. .. 4. The conductive foil and the bonding material have a specific resistance of 0.
2. A material having a resistance of 1 .OMEGA.cm or less.
The electromagnetic wave shielding laminated panel according to claim 3.