JPH075570A - Sheet material for screen - Google Patents

Abstract

PURPOSE:To provide the sheet material for a screen capable of brightly projecting a projected screen over the entire sheet surface. CONSTITUTION:This sheet material 1 for the screen is composed of a base material sheet 2 composed of a material having light transmissivity and a bead layer 3 which is applied to one or both surfaces of this sheet 2 and consists of a binder (transparent plastic resin) 6, transparent beads 5 and/or colored beads 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen sheet material, and more particularly to a transmissive screen sheet material capable of clearly displaying a projection screen.

[0002]

2. Description of the Related Art Conventionally, a sheet material for a screen, which is formed by coating glass beads or the like on a sheet base material made of a plastic film, cloth, glass fiber or the like, has been widely used. . However, according to these conventional screen sheet materials, it is difficult to project a projected image clearly over the entire screen, and the peripheral portion of the screen becomes dim, which causes discomfort to the viewer (viewer). Met.

Further, in the conventional screen sheet material,
In reality, the image was only displayed on the projection surface side of the sheet material, and thus the back surface of the sheet material was not used at all.

[0004]

In view of the problems pointed out in the above-mentioned conventional sheet materials for screens, the present invention provides a sheet material for screens capable of obtaining a clear image on the entire screen surface. It is invented for the purpose of, and the gist thereof is that it is composed of a base material sheet made of a substance having permeability and a bead layer coated on at least one surface of the base material sheet. It is a sheet material for screens.

That is, in the structure of the bead layer of the present invention,
The following three aspects are included.

A bead layer composed of transparent beads and a binder (FIG. 1 (a)).

A bead layer composed of colored beads and a binder (FIG. 1 (b)).

A bead layer composed of transparent beads, colored beads and a binder (FIG. 1 (c)).

As the base material sheet in the present invention, a light-transmitting material such as plastic film, glass, glass fiber, ceramic fiber, cloth and synthetic paper is used, and the sheet thickness is not particularly limited. However, considering the difficulty of processing and handling, 10-1000μ
About m is preferable.

As the transparent beads, acrylic resin beads, glass beads and the like can be used, and the particle size of the transparent beads is not particularly limited, but considering the light diffusion effect, it is about 1 to 100 μm. Of, preferably,
Use beads with different particle sizes mixed. Similarly, the colored beads may be those having a plastic (for example, an acrylic copolymer) or glass as a main component, and the coloring material for coloring these beads may be a pigment such as milky white. Titanium oxide to impart, phthalocyanine blue to impart blue, cyanine green to impart green, red iron oxide to impart brown, etc. can be used, among which, since a high-definition image can be obtained,
Titanium oxide is particularly preferred. The particle size of the colored beads is not particularly limited, but is preferably about 1 to 100 μm in consideration of the image effect and the like. In addition, when the transparent beads and the colored beads are mixed and used (FIG. 1 (c)),
The mixing ratio of the two is preferably in the range of 99: 1 wt% to 1: 4 wt% in consideration of the image clarity.

Further, as the binder, a transparent plastic resin (eg acrylic resin or urethane resin) can be used in the present invention. In addition, the blending ratio of the beads and the binder, considering the light diffusion effect,
The range of 5 to 90 parts by weight of beads is preferable with respect to 100 parts by weight of binder.

Further, the thickness of the bead layer of the present invention is not particularly limited, but in consideration of the difficulty of coating on the base material sheet by the well-known roll coating method, the strength and the light diffusion effect, etc. About 10 to 500 μm is preferable. Further, regarding the arrangement of the beads in the bead layer, considering the light diffusion effect and the like, the beads embedded in the binder and the beads partially embedded in the binder are used in a mixed manner, and the beads are used as a base. It is preferable that the surface of the material sheet is dispersed or distributed so as to cover the surface of the base material sheet.

As the coating method of the beads of the present invention, a mode in which a bead layer is formed only on one surface of the base sheet (one side coating) shown in FIG. 2 (a) is more preferable. In order to obtain the light-transmitting / light-diffusing effect, there is a mode in which a bead layer is formed (both sides coated) on both sides of the substrate sheet shown in FIG. 2 (b).

Further, for the purpose of imparting a disaster prevention function to the beads, the base sheet, or the binder constituting the sheet material of the present invention, a flame retardant treatment, that is, a flame retardant, for example,
Triphenyl phosphate, polycresyl phosphate, etc. can be added.

The screen sheet material obtained by the present invention may be used in a known manner, for example,
It can be applied to a screen form such as a roller screen (Fig. 3 (a)) or a panel stand type screen (Fig. 3 (b)).

[0016]

EXAMPLES Examples of the screen sheet material of the present invention will be described below.

According to the structure of the present invention, as shown in FIG. 2 (a), the light beam 7 emitted from the projector passes through the light-transmissive base material sheet 2 of the screen sheet material 1, After repeated contact, refraction, and reflection with the colored beads 4 and / or the transparent beads 5 dispersed in the binder 6 of the bead layer 3 are repeated, the light uniformly diffused through the bead layer 3 To bring.

Further, by coating both sides of the bead layers 3 and 3 as shown in FIG.
The reflection patterns are varied, and the diffusivity and homogeneity of the light passing through the two bead layers 3 and 3 are further enhanced.

As a result, the diffusivity of the light passing through the bead layer 3 becomes uniform, and the screen sheet material 1 reflects a part of the light beam 7 emitted from the projector and transmits a part thereof. A bright and clear image is projected on the screen.

Further, as shown in FIG. 1 (c), by using the colored beads 4 and the transparent beads 5 together, the degree of light diffusion can be adjusted, and further, the colored beads 4 to be used and the transparent beads 5 are transparent. By adjusting the mixing ratio and the particle size of the beads 5, the screen brightness can be adjusted.

Example 1 A polyethylene terephthalate sheet having a thickness of 200 μm (“PET 200”; manufactured by Dia foil Co., Ltd.) was used as a substrate sheet, and the upper surface thereof was shown in Table 1 by a well-known roll coating method. Apply a coating solution of composition, thickness 50μ
A bead layer of m 2 was formed to prepare a screen sheet material of the present invention having the structure shown in FIG. 1 (a).

[0022]

[Table 1]

The sheet material was tested for total light transmittance and haze characteristics in accordance with JIS K 7105 A method and JIS K 7105 method, respectively. The test results are shown in Table 2 below.

[0024]

[Table 2]

The sheet material obtained in this example is
When used as the image surface of the screen, an extremely bright and powerful image was projected on the entire screen surface.

Example 2 The same polyethylene terephthalate sheet as in Example 1 was used as a substrate sheet, and the coating liquid having the composition shown in Table 3 below was applied on the upper surface of the sheet by a well-known roll coating method to give a thickness.
A 50 μm bead layer was formed to prepare a screen sheet material of the present invention having the structure shown in FIG. 1 (b).

[0027]

[Table 3]

This sheet material was tested in the same manner as in Example 1 for each characteristic of total light transmittance and haze. The test results are shown in Table 4 below.

[0029]

[Table 4]

The sheet material obtained in this example is
When used as the image surface of the screen, as in the screen material of Example 1, an extremely bright and powerful image was projected on the entire screen surface.

Example 3 The same polyethylene terephthalate sheet as in Example 1 was used as a substrate sheet, and the coating liquid having the composition shown in Table 5 below was applied to the upper surface of the sheet by a well-known roll coating method to give a thickness.
A 60 μm bead layer was formed to prepare a screen sheet material of the present invention having the structure shown in FIG. 1 (c).

[0032]

[Table 5]

This sheet material was tested for the characteristics of total light transmittance and haze in the same manner as in Example 1. The test results are shown in Table 6 below.

[0034]

[Table 6]

The sheet material obtained in this example is
When used as the image surface of the screen, an extremely clear image was projected as in the screen material of Example 1.

Example 4 The same polyethylene terephthalate as that used in Example 1 was used as a substrate sheet, and a coating solution having the composition shown in Table 7 below was applied on the upper surface thereof by a well-known roll coating method. ,
A bead layer having a thickness of about 50 μm was formed.

[0037]

[Table 7]

Next, a coating solution having the composition shown in Table 7 was applied to the lower surface of the base sheet (the back surface of the upper surface) by a well-known roll coating method to form a bead layer having a thickness of about 50 μm. Was formed to prepare a screen sheet material of the present invention having the structure shown in FIG. 2 (b).

The sheet material thus obtained was tested for each characteristic of total light transmittance and haze in the same manner as in Example 1. The results are shown in Table 8 below.

[0040]

[Table 8]

When the sheet material obtained in this example was used as a screen image (projection screen material), an extremely clear image was projected as in the case of the screen material of Example 1.

Example 5 The same polyethylene terephthalate as that used in Example 1 was used as a substrate sheet, and the coating liquid having the composition shown in Table 9 below was applied on the upper surface thereof by a well-known roll coating method. ,
A bead layer having a thickness of about 30 μm was formed, and a sheet material for a screen of the present invention in which a flame retardant was used was prepared.

[0043]

[Table 9]

With respect to this sheet material, the base material sheet was kept horizontal, the flame of the gas burner was opened at a distance of 2 cm, and it was set at the sheet end portion and the central portion, and the combustion was continued for 5 to 10 seconds to The combustion state was visually observed and evaluated. As a result, even after burning for 10 seconds, the sheet ignited and darkened slightly, but spontaneously extinguished without spreading fire, and it was confirmed that the sheet material of this example had good flame retardancy. Further, this sheet material was tested for each property of total light transmittance and haze by the same method as in Example 1, and the results are shown in Table 10 below.

[0045]

[Table 10]

Further, when this sheet material was used as an image for a screen material (screen material for projection), an extremely clear image was projected as in the screen material of Example 1.

From the results of the above examples, the characteristic values of total light transmittance and haze of the bead layer constituting the sheet material for a screen of the present invention are 10 to 99% and 2 to 95%, respectively.
It has been found that adjusting within the range becomes one of the indexes for obtaining a desired video effect.

[0048]

According to the sheet material for a screen of the present invention, the diffusivity of the light beam introduced into the sheet material is improved, and the uniformly diffused light beam can provide a very good image on the entire surface of the screen, and the viewer can see it. On the other hand, it is possible to give a visually and aesthetically pleasing impression.

[Brief description of drawings]

1 (a), (b) and (c) are partial cross-sectional views showing an embodiment of the present invention.

2 (a) and 2 (b) are views for explaining the configuration of the present invention.

FIG. 3 (a) and (b) are diagrams showing a use mode of the present invention.

[Explanation of symbols]

 1 ... Sheet material for screen 2 ... Substrate sheet 3 ... Bead layer 4 ... Colored beads 5 ... Transparent beads 6 ... Binder 7 ... Rays

Claims (7)

[Claims] 1. A screen sheet material for use in a transmissive screen, comprising a light-transmissive base material sheet and a bead layer coated on at least one surface of the base material sheet. A sheet material for a screen, wherein the base material sheet is made of a material having a light-transmitting property, and the bead layer is made of a transparent plastic resin, transparent beads and / or colored beads. 2. The sheet material for a screen according to claim 1, wherein the bead layer is coated on both sides of the base sheet. 3. The sheet material for a screen according to claim 1, wherein the light-transmitting substance is polyethylene terephthalate. 4. The transparent beads and / or the colored beads are composed of beads of various particle sizes.
The sheet material for a screen according to any one of 1 to 3. 5. A transparent bead and / or a colored bead according to claim 1, wherein the transparent bead and / or the colored bead is composed of a bead embedded in the binder and a bead partially embedded in the binder. Sheet material for screens. 6. The sheet material for a screen according to claim 1, wherein the bead layer has a total light transmittance of 10 to 99% and a haze of 2 to 95%. 7. The sheet material for a screen according to claim 1, wherein the bead layer further contains a flame retardant.