JP3516923B2 - Video display screen - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display screen for providing an image to passersby in a building for construction work, which is preferably required to be soundproof.

[0002]

2. Description of the Related Art For example, as a display device for providing images such as still images and moving images to passersby,
There are plasma displays, liquid crystal displays, projection televisions, and the like. However, these display devices have problems such as an increase in the size of the entire screen and an increase in cost when the screen is enlarged.

In recent years, an image display system including a hologram screen and a projector for projecting an image on the hologram screen has been proposed as a device capable of easily displaying an image on an existing window glass. The hologram screen is a screen configured by attaching a thin film hologram element to transparent glass, and the hologram element has interference fringes, and when an image is projected on the interference fringes, image light is imaged. , A real image is formed.
An image can be recognized on the hologram element by the diffracted light scattered and reflected from the real image.
In addition, instead of the hologram element, a directional screen including a diffraction grating or a light selection film may be used.

In recent years, there has been a rear type screen in which a projector is installed on the back of a transmissive screen to project an image. The transmissive screen is, for example, 1
Fresnel lens that refracts the projected light so that it is perpendicular to the screen surface on one side (projection surface side) of one acrylic plate, and widely spreads in a wedge shape horizontally on the other surface side (viewer side) There is a screen in which a lenticular lens is incorporated, or a screen in which a Fresnel lens screen and a lenticular lens screen are stacked one by one.

[0005]

However, even if the hologram screen or rear type screen is expensive to manufacture and can be used in a permanent facility that is suitable for investment, it is a temporary facility such as a building for construction work. It cannot be adopted at all.

On the other hand, in the case of a construction work building surrounding a vertical shaft, a structure (a soundproof building) is adopted in which a wall surface is constituted by soundproof panels so that noise does not diffuse to the outside. Screens and rear type screens cannot satisfy the required soundproofing performance. In addition, there is a problem that the soundproof building cannot take in sunlight and the working environment becomes dark.

[0007] Therefore, the main other Ru challenges of the present invention, without the use of a video display screen specialized products, and can be easily adopted in such temporary facilities such as inexpensive and construction work building door
Moni, to provide a Film image display screen so as to satisfy the required sound insulation performance.

[0008]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the inventors of the present invention have found that they are placed at a predetermined distance from a passerby on a large screen and cannot be seen up close. In some cases, such as when the image quality may be sacrificed to some extent, by attaching a semi-transparent resin film to transparent glass or a transparent resin plate, sufficient projection quality can be obtained. Based on experiments, it was found that by using a transparent resin plate having a predetermined thickness or more, it is possible to obtain soundproofing performance comparable to existing soundproofing walls. The present invention was made based on these findings.

[0009] Consequently, as a pre-Symbol Division present onset <br/> bright for solving the problem, it characterized in that it is bonded a semi-transparent film on one side of at least more than 20mm thick transparent resin plate An image display screen is provided.

JIS A 57 is used as the semi-transparent resin film.
It is preferable to use one having a transmittance of 50 to 80% according to 59.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a video display screen 1 according to the present invention.
Is a view showing a soundproof building built in the wall surface, and FIG. 2 is a partial sectional view thereof.

The soundproof building 2 is a building constructed so as to cover a vertical shaft for the construction of a shield tunnel, and the wall surface and the roof surface are made of a soundproof panel 3 in which a soundproof material is enclosed in a steel casing. It is configured.

At the front of the building shown in FIG. 1 (A), a shutter gate 4 through which construction vehicles move in and out is provided, and an image display screen 1 is incorporated in the upper wall surface of the shutter gate 4. . Speakers 5 and 5 are arranged on both sides of the speaker.

The image display screen 1 is a transparent resin plate having a thickness of at least 20 mm and a semi-transparent film attached to one side (usually the image projection side) of the transparent resin plate. The image display function, soundproof function and daylighting function are provided. Have both. As the transparent resin plate, for example, various transparent resins such as acrylic resin, polycarbonate, polyamide resin, vinyl chloride resin, phenol resin, unsaturated polyester, and epoxy resin can be used. Among them, acrylic resin or Polycarbonate is preferably used. These resins can be particularly suitably used as an image display screen because of their high transparency, lightness and durability. The reason why the thickness is 20 mm or more is that it is possible to have the same soundproofing performance as that of the existing soundproofing panel with the thickness of 20 mm, according to the experiment described later.

The material of the translucent film is not particularly limited, but an olefin resin film such as polyethylene or polyester, a polycarbonate film, a polyamide film, an acrylic resin film, a polyether sulfone film, a vinyl chloride resin film. You can use something like
For example, fine particles of metal oxide such as titanium oxide (TiO ₂ ), zinc oxide (ZnO), zinc sulfide (ZnS) and silica (SiO ₂ ) are internally added, or thin films of these metal oxides are formed by vapor deposition or sputtering. A white or semi-transparent film (antireflection film) is preferably used by forming a layer or a plurality of layers. Among these semi-transparent methods, those having a semi-transparent film formed of titanium oxide are particularly preferably used. Titanium oxide has a refractive index of 2.55 when the crystal structure is anatase, and has a refractive index of 2.76 when it is rutile, and refracts light projected from a projector so that it is perpendicular to the screen surface. Therefore, it becomes possible to project a clearer image than the others. The refractive index of the resin is about 1.4 to 1.6, and the semi-transparent film made of titanium oxide has a significantly higher refractive index than the semi-transparent film made by the manufacturing method or chemical treatment. Have a rate.

The translucency of the translucent resin film is JI
The transmittance according to SA 5759 is preferably 50 to 80%. If the transmittance is less than 50%, most of the light projected from the image projector such as a projector is blocked, and the screen surface becomes too dark when viewed from the passerby side, and the presence of the image may not be noticed. It is not preferable because it exists. Further, when the transmittance exceeds 80%, most of the light projected from the image projector such as a projector is transmitted, and when viewed from the passerby side, the screen surface is too bright to clearly recognize the image. There is a case where it is not preferable.

To attach the translucent resin film to the transparent resin plate, use a colorless transparent or translucent adhesive such as synthetic resin, synthetic rubber, silicone-based or polyurethane-based adhesive. Although it is also possible, it is desirable to adhere by water bonding. As the adhesive used for pasting with water, for example, an acrylic ester copolymer, a styrene acrylate copolymer, polyvinyl alcohol, a water-soluble polymer, a resin-based organic binder that becomes transparent after drying, etc. is used. can do.

On the other hand, in order to build the image display screen 1 in the soundproof building 2, as shown in FIG. 3, a protective frame 10 is provided on the image display screen 1 in order to prevent the image display screen 1 from being damaged. Provide integrally. The protective frame 10 is formed by assembling an H-shaped member or the like into a rectangular frame shape in accordance with the dimensions of the image display screen 1, and a back holding plate 11 is fixed along the peripheral edge on the inner side of the prospective surface of the frame portion. After the display screen 1 is fitted, the ridge 12 is fixed along the outer edge of the outdoor gutter by bolts or the like, and the image with the protective frame 10 is attached to the screen installation opening 13 formed in the protective building 2. The display screen 1 is built in and fixed to the H-shaped member 14 forming the screen installation opening 13 firmly with bolts or the like.

When the image display screen 1 is built on the wall surface of the protective building 2 according to the above procedure, the image display screen 1 is provided inside the protective building 2 as shown in FIG.
An image projecting device 6 for projecting an image is installed. As the image projector 6, a device capable of projecting image light, such as a projector, a slide projector, or a projector, can be used. The image supplied to the image projector 6 can be supplied from, for example, a video tape, an optical disc, a personal computer, or the like.

By the way, in this example, since the image display screen 1 is provided in the soundproof building 2, in order to give the transparent resin plate the same soundproof performance as that of the existing soundproof panel, the thickness of the predetermined thickness (20 mm) or more is required. I used the transparent glass or transparent resin plate on one side of the transparent glass or transparent resin plate in order to give the image display function to the transparent glass or transparent resin plate that forms the wall surface in the entrance hall of the building. You may wear it.

[Experimental Example] It was clarified by an experiment as to how many mm or more the thickness of the transparent resin plate (acrylic plate) should be set to have the same soundproofing performance as that of the existing soundproofing panel. In the experiment, sound transmission loss (d) for each center frequency was measured for four types of existing soundproof panel and acrylic plate (t = 8 mm, 10 mm, 20 mm).
This was done by measuring B). The results are shown in Table 1 and also shown in FIG.

[0023]

[Table 1]

As is clear from Table 1 and FIG. 4, it has been found that the acrylic plate having a thickness of 20 mm can ensure the same soundproof performance as that of the existing soundproof panel.

[0025]

As described above in detail, according to the present invention, there is provided an image display screen which is inexpensive and can be easily adopted in a temporary facility such as a building for construction without using a dedicated image display screen. It will be possible. Further, it is possible to provide a video display screen which satisfies the required soundproof property and can also be used as a soundproof / lighting panel.

[Brief description of drawings]

FIG. 1 is a front view and (B) is a side view showing a soundproof building in which a video display screen 1 according to the present invention is incorporated into a wall surface.

FIG. 2 is a partial sectional view of a soundproof building.

FIG. 3 shows a built-in state of the video display screen 1,
(A) is a front view and (B) is a vertical sectional view.

FIG. 4 is a diagram showing a result of a sound insulation performance experiment.

[Explanation of symbols]

1 ... Image display screen, 2 ... Soundproof building, 3 ... Soundproof panel, 4 ... Shutter gate, 5 ... Speaker, 6 ... Image projector

Claims (2)

(57) [Claims] 1. A video display screen comprising a transparent resin plate having a thickness of at least 20 mm and a semitransparent film attached to one side thereof. Wherein said translucent resin film, video display screen according to claim 1 Symbol placement used as 50-80% in the transmittance due to JIS A 5759.