JPH10322082A - Electromagnetic shielding window unit of railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic shielding window unit which is simple in structure and applicable to an existing vehicle by replacing only a window by a method wherein a conductive film is provided on the non-exposed side of a glass plate which is one of the two outer glass plates of a window glass and located closer to a window frame than the other. SOLUTION: A window unit 3 is composed of a window glass 5 and a window frame 6 which is U-shaped in cross section covering all the peripheral edge of the window glass 5. The window frame 6 is formed of metal material such as aluminum extrusion material or the like. The window glass 5 has such a multilayered galss structure that a laminated glass formed of a first glass plate 11 and a second glass plate 12 which are bonded together interposing an intermediate film 10 between them and a glass plate 13 are laminated together through the intermediary of an air layer 14. The inner side of the glass plate 11 is coated with an electromagnetic shielding conductive film 16. It is preferable that the conductive film 16 is provided close to the side piece 6a (or 6b) of the grounded window frame 6. When a laminate is composed of glass plates, it is also preferable that the conductive film 16 is provided on the inner side of the laminate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetic shielding window,
In particular, the present invention relates to an electromagnetic shielding window unit applied to a window of a railway vehicle.

[0002]

2. Description of the Related Art Conventionally, in order to prevent various electronic devices from malfunctioning due to external jamming radio waves in a building room or an automobile, or to block radio waves leaking from inside to outside, windows of a building have conventionally been used. Electromagnetic shielding windows in which a conductive film is provided on windows of automobiles and automobiles are used. The conductive film of such an electromagnetic shielding window is connected to the ground and has a required electromagnetic shielding function.

On the other hand, as a window glass of a building or an automobile, a laminated glass in which two glass plates are bonded via an interlayer film for preventing scattering at the time of breakage and enhancing safety, and a further laminated glass. BACKGROUND ART Double-layered glass in which glass plates are laminated via an air layer to improve heat insulation and sound insulation is used. In recent years, such laminated glass and double-glazed glass have come to be used also as window glasses of railway vehicles.

[0004] In recent years, in railway vehicles, malfunctions due to external noise radio waves when electronic devices are installed or brought into vehicles have been prevented, and noises on electronic devices along railway lines due to leakage radio waves from inside the vehicles to the outside have been reduced. In order to prevent such problems, it has been studied to provide the window glass with an electromagnetic shielding function.

[0005]

However, a railway vehicle has a unique and complicated structure, and the structure is further complicated if an earth connection is attempted. Therefore, conventional electromagnetic shielding glass for buildings and automobiles is simply used. It is not practically appropriate to apply to windows of railway vehicles. In addition, in order to effectively use existing vehicles and prevent waste of equipment and resources, existing vehicles are required to have a structure that can be easily handled by replacing only the window glass. Cannot simply be applied to the windows of railway vehicles.

[0006] The present invention has been made in view of the above points, and has a simple structure and a sufficient electromagnetic shielding function.
It is an object of the present invention to provide an electromagnetic shielding window structure for railway vehicles that can be applied to existing vehicles by replacing only the windows without changing the structure of the vehicle itself.

[0007]

In order to achieve the above object, according to the present invention, there is provided a window glass comprising a plurality of glass plates, a metal window frame having a U-shaped cross section surrounding the periphery of the window glass, An electromagnetic shielding window unit for a railway vehicle, comprising: a conductive film provided on a non-exposed surface side of a glass plate closer to the window frame among glass plates on both outer sides of the glass.

According to this construction, the window frame is grounded to the ground by attaching the metal window frame having a U-shaped cross section to the vehicle body. Since the conductive film is formed on the non-exposed surface of the glass plate, the conductive film is disposed sufficiently close to the metal window frame, and a sufficient electromagnetic shielding function is secured. Therefore, the electromagnetic shield structure can be realized only by replacing the window glass or the window glass and the window frame integrally without changing the vehicle body structure or the mounting structure of the window frame with respect to the vehicle body. A railway vehicle equipped with an electromagnetic shielding window having a large practical value can be obtained without wasting equipment and resources.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment,
The window glass is characterized by being composed of a laminated glass in which two glass plates are bonded via an interlayer film, and a multi-layer glass in which one glass plate is laminated on the laminated glass via an air layer. .

According to this configuration, the electromagnetic shielding structure of the present invention can be applied to the double-glazed glass, a sufficient electromagnetic shielding function can be obtained, and the railway vehicle is excellent in safety, heat insulation and sound insulation. Window is obtained.

[0011] In another preferred embodiment, the window glass is made of only a laminated glass in which two glass plates having different thicknesses are joined via an intermediate film.

According to this configuration, the electromagnetic shielding structure of the present invention can be applied to a laminated glass composed of two glass plates, and a sufficient electromagnetic shielding function can be obtained by making one glass plate sufficiently thick. And a high strength electromagnetic shielding window for railway vehicles can be obtained.

In a further preferred embodiment, the length between the conductive film and a side piece closer to both sides of the U-shaped window frame is equal to the length between both side pieces of the window frame. It is characterized in that it is 1/4 or less.

According to this configuration, since the conductive film is close to the window frame grounded to the ground within a distance of not more than 1/4 of the width between the U-shaped side pieces, a sufficient electromagnetic shielding function can be obtained. . If the distance is longer than this, the electromagnetic shielding function deteriorates too much and a desired and sufficient shielding effect cannot be obtained. From a practical viewpoint, the distance is preferably 8 mm or less, particularly preferably 5 mm or less.

In still another preferred embodiment, the conductive film has a sheet resistance of 20 Ω / □ or less.

According to this configuration, the sheet resistance is 20 Ω /
By setting it as □ or less, the conductivity is enhanced and a sufficient shielding effect can be obtained. In this case, preferably 10Ω / □
The sheet resistance is as follows, more preferably 3Ω / □. By thus reducing the sheet resistance value, a sufficient electromagnetic shielding effect can be obtained. 20Ω /
If the sheet resistance exceeds □, the desired sufficient shielding effect cannot be obtained.

[0017]

FIG. 1 is a structural view of an electromagnetic shielding window for a railway vehicle according to an embodiment of the present invention. An opening 2 for a window is formed in a vehicle body wall 1 constituting a side surface of the vehicle. The window unit 3 is fixed to the vehicle body wall 1 by the metal fixing bracket 4 inside the opening 2.
Attached to. The window unit 3 includes a window glass 5 and a window frame 6 having a U-shaped cross section surrounding the outer periphery of the entire periphery thereof. The window frame 6 is formed of a metal material such as an extruded aluminum material. The window frame 6 is attached to the fixing bracket 4 so that
It is fixed to the vehicle body wall 1 without any gap.

The window glass 5 has a window frame 6 around its periphery.
It is mounted via a cushion material 7 and a packing 8, and the opening is sealed with a seal material 9. Any or all of the cushion material 7, the packing 8, and the seal material 9 may be made of a conductive material.

The window glass 5 is provided with an interlayer 10 interposed therebetween.
The laminated glass structure has a laminated glass formed by bonding a first glass plate 11 and a second glass plate 12 together, and a third glass plate 13 laminated on the laminated glass via an air layer 14. The intermediate film 10 is made of a resin material such as polyvinyl butyral, and is for preventing scattering at the time of glass breakage and improving safety. The air layer 14 is
It is formed by a sealing material 15 also serving as a spacer provided on the peripheral edge between the glass plate 12 and the third glass plate 13. A moisture absorbent (not shown) for removing moisture in the air layer 14 to prevent dew condensation may be provided inside the seal member 15.

A conductive film 16 for electromagnetic shielding is coated on the inner surface side (non-exposed surface side) of the outer first glass plate 11 constituting the laminated glass. The conductive film 16 may be made of an Ag-based material composed of an Ag single layer (or a multilayer structure of an Ag layer and another oxide or metal layer), a SnO2 single layer (or a SnO2 layer and another oxide or metal layer, etc.). An ITO-based material composed of a single layer of ITO (or a multilayered structure of an ITO layer and another oxide or metal layer) is used. The sheet resistance of the conductive film 16 is 20Ω / □ or less, preferably 10Ω / □ or less, in order to obtain a sufficient electromagnetic shielding effect.
More preferably, it is set to 3Ω / □.

It is desirable that such a conductive film 16 be provided as close to the side piece 6a (or 6b) of the grounded window frame 6 as possible. In the case of a laminated body of a plurality of glass plates, in order to prevent peeling or scratching during washing, the laminated body is provided not on the exposed surfaces on both outer sides but on the laminated surface on the inner surface side (non-exposed surface). desirable. In the case of this example, the conductive film 1
6 are coated on the inner surface side of the intermediate film 10 (the structure shown), the inner surface of the intermediate film 10 (the outer surface of the second glass plate 12), and the second glass. There are four surfaces, namely, a surface on the vehicle inner side of the plate 12 and a surface on the air layer side of the third glass plate 13. In order to increase the electromagnetic shielding effect as close as possible to the side piece 6 a (or 6 b) of the window frame 6,
As shown in the figure, the outer surface of the intermediate film 10 (the first glass plate 1).
1). Such a conductive film 1
The surface on which window 6 is formed is a window in window frame 6 according to the thickness of first glass plate 11 and third glass plate 13 on both sides of window glass 5 and the thickness of packing 8 on both sides of window glass 5. Glass 5
Is determined in consideration of the position and the like.

The conductive film 16 may be provided on two or more surfaces. In the case of providing on two surfaces, it is desirable to make the interval as wide as possible and form them on separate surfaces in order to enhance the electromagnetic shielding effect (see experimental data described later).

In the electromagnetic shielding window structure having the above structure, a window unit 3 in which a window glass 5 and a window frame 6 are integrated is formed in advance, and the window unit 3 can be attached to and detached from the vehicle body wall 1 via a fixing bracket 4. With such a structure, it is easy to attach and detach and replace during repair and maintenance work, and it is also possible to easily replace the window of the existing vehicle attached to the vehicle body wall with the electromagnetic shielding window using the fixing bracket 4. it can.

FIG. 2 is a structural view of a window glass according to another embodiment of the present invention. In this example, the structure of the window glass 5 is a laminated glass structure instead of the double-layer glass structure of FIG. That is, the window glass 5 is composed of the first glass plate 17, the second glass plate 18, the intermediate film 10 interposed therebetween, and the conductive film 16 provided on one surface thereof. First
By making the glass plate 17 sufficiently thick, the strength of the window glass 5 can be increased. In addition, the conductive film 16 is formed of the thinner second conductive layer.
By providing the glass frame 18 so as to face it, the window frame 6 (see FIG. 1) which is grounded can be sufficiently brought close to obtain a sufficient shielding effect. The other configuration and operation and effect are the same as those of the embodiment of FIG.

Hereinafter, experimental results of the electromagnetic shielding window related to the present invention will be described. In the first experiment, a current railway vehicle was used to measure the shielding factor when the window glass was completely shielded by an aluminum sheet and when an electromagnetic shielding glass was attached. Experiments were conducted on a vehicle with 17 side windows on one side, 810 MHz and 860 MHz transmitted from the outside on the vehicle center passage side and vehicle center window side.
Was received and its intensity was measured. A completely shielded vehicle is one in which the windows, partition doors, ventilation openings, and other openings are all covered with aluminum foil and copper tape, and the vehicle body is grounded. The vehicle with the electromagnetic shielding glass has a side window replaced with an electromagnetic shielding glass and other openings are covered with aluminum foil or copper tape.

FIG. 3 shows the electromagnetic shielding glass structure of this experiment. As shown in (B), a transparent conductive film 20 is provided on one surface of a glass plate 23, which is mounted in an attachment frame 24 via a packing 25 and a backup material 26, and sealed with a sealing material 27. . An aluminum tape is adhered to the outer surface of the attachment frame 24. Further, an aluminum tape 22 was attached to the outer periphery of the transparent conductive film 20 over the entire circumference as shown in FIG. The dimensions of each part are a = 22 mm, b = 1
5 mm, c = 2 mm, d = 11.5 mm, e = 11.5
mm, f = 2 mm, g = 10 mm, h = about 10 mm.

A summary of the experimental results is shown in Tables 1 and 2 below. Table 1 shows a comparison of the shielding ratio on the side of the vehicle center passage, and Table 2 shows a comparison of the shielding ratio on the side of the vehicle center window. The unit is dB. The shielding ratio is a value when the louver for air conditioning is in a closed state, and the full-wave average is an arithmetic average value of the shielding ratio at all frequencies.

[0028]

[Table 1]

[0029]

[Table 2]

According to this experiment, by attaching the electromagnetic shielding glass of FIG.
An improvement in shielding performance of about B was confirmed. This was only about 2-3 dB compared to the complete shielding state with the aluminum sheet, and it was confirmed that a state close to practically complete shielding was obtained in practice.

In the second experiment, the relationship between the position of the conductive film in the window frame and the electromagnetic shielding performance was examined. FIG. 4 is a schematic configuration diagram of a window in which this experiment was performed. A window frame 41 is fixed to the vehicle body wall 40, and a glass plate 42 is mounted on the window frame 41. One surface of the glass plate 42 is coated with a transparent conductive film 43. The distance p (the distance from the left side piece) and q (the distance from the right side piece) of the transparent conductive film 43 from both side pieces of the window frame 41 and the amount of overlap L between the window frame and the conductive film are changed. The electromagnetic shielding performance was measured. In the experiment, two types of transparent conductive films A and B were used. The transparent conductive film A is a conductive film containing Ag, and the transparent conductive film B is a SnO2 conductive film. The measured values are 0.8 GHz, 0.9 GHz, 1.5
It is an average value at GHz.

Table 3 shows a summary of the measurement results.

[0033]

[Table 3]

According to this experiment, even when the grounding with the aluminum tape was not performed, the electromagnetic shielding performance was about 20 d.
It was confirmed that B could be retained. It was also confirmed that the larger the overlap amount L, the better the results. If the electromagnetic shielding performance of about 20 dB is a necessary condition, for example, the position of the conductive film is one-fourth of the width between both side pieces (corresponding to p + q in FIG. 4) or one side piece of the window frame. It is necessary to provide it at a distance within 8 mm. About 20
If the electromagnetic shielding performance is in dB, the shielding effect on commonly used electronic equipment is sufficient.

In the third experiment, the relationship between the conductive film coated surface of the double-layer glass and the electromagnetic shielding performance was examined. As shown in FIG. 5, the experiment was performed using a double-layer glass including a first glass plate 31, a second glass plate 32, a third glass plate 33, an intermediate film 34, and an air layer 36 formed by spacers 35. Was. The thickness of each glass plate is 3 mm, the thickness of the air layer is 6 mm, and the thickness of the interlayer is 0.38 mm. In this experiment, the conductive film was connected to ground from the peripheral portion with an aluminum tape. The four laminated surfaces A, B, C, and D on the inner surface side (non-exposed surface side) of the double-glazed glass are defined as coating surfaces of the conductive film, and
In the case where the surface and the two surfaces were coated, the electromagnetic shielding factor was measured by setting the left side of the figure to the outside transmitting side and the right side to the inside receiving side. As for the measurement sample, the one-layer coat is four pieces of a to d,
The experiment was conducted on five sheets e to i of the two-layer coat.

Table 4 shows the measurement results.

[0037]

[Table 4]

As a result of the experiment, in the case of a one-layer coat, A to A
There was almost no difference in the shielding ratio regardless of the surface of D, and it was confirmed that in the case of the two-layer coating, the electromagnetic shielding performance was improved as the distance between the conductive film coatings was increased.

[0039]

According to the present invention, the electromagnetic shield structure can be easily realized only by replacing the window glass or the window glass and the window frame integrally without changing the vehicle body structure or the mounting structure of the window frame to the vehicle body. Thus, a railway vehicle provided with an electromagnetic shielding window having a large practical value can be obtained by effectively utilizing existing vehicles and eliminating waste of existing facilities and resources.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electromagnetic shielding window according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an electromagnetic shielding window glass according to another embodiment of the present invention.

FIG. 3 is a configuration explanatory view of a glass window used in a first experiment.

FIG. 4 is an explanatory diagram of a configuration of a glass window used in a second experiment.

FIG. 5 is a configuration explanatory view of a double-glazing used in a third experiment.

[Explanation of symbols]

1: body wall, 2: opening, 3: window unit, 4: fixing bracket, 5: window glass, 6: window frame, 6a, 6b: side piece,
10: intermediate film, 11: first glass plate, 12: second glass plate, 13: third glass plate, 14: air layer, 16: conductive film.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kiyoshi Shibata 1-1-1 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Keihin Plant of Asahi Glass Co., Ltd.

Claims (5)

[Claims] 1. A window glass composed of a plurality of glass plates, a metal window frame having a U-shaped cross section surrounding the periphery of the window glass, and a glass plate on both outer sides of the window glass, which is closer to the window frame. And a conductive film provided on the non-exposed surface side of the glass plate. 2. The window glass is composed of a laminated glass in which two glass plates are bonded via an interlayer film, and a double-layer glass in which one glass plate is laminated on the laminated glass via an air layer. The railroad vehicle electromagnetic shielding window unit according to claim 1. 3. The electromagnetic shielding window unit for a railway vehicle according to claim 1, wherein the window glass is formed only of a laminated glass in which two glass plates having different thicknesses are bonded via an interlayer film. 4. A length between the conductive film and a side piece closer to both sides of the U-shaped window frame is not more than ４ of a length between both side pieces of the window frame. The electromagnetic shielding window unit for a railway vehicle according to claim 1. 5. The electromagnetic shielding window unit for a railway vehicle according to claim 1, wherein the conductive film has a sheet resistance of 20 Ω / □ or less.