JPS59133534A - Translucent screen - Google Patents

Abstract

PURPOSE:To raise a contrast and to widen an observable range in the horizontal and vertical directions by mixing 0.5-10wt% a light scattering material whose particle diameter is 0.5-50mum into a transparent base having a lenticular lens all over its surface. CONSTITUTION:A lenticular lens 11 and a light shielding layer 12 are provided on one surface of a transparent base consisting of a transparent synthetic resin, and a light shielding part on the other surface, respectively. Subsequently, a colored light scttering material 14 which is an organic or inorganic material and has a particle diameter of 0.5-50mum is kneaded by 0.5-10wt.pts. to 100wt.pts. synthetic resin. In this way, it is possible to obtain a screen which has the spread of an emitted light in not only the horizontal direction but also the vertical direction, has a high picture contrast, and also has a wide observable range in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved transmissive screen that provides high image contrast when used and has a wide observable range not only in the horizontal direction but also in the vertical direction.

Conventionally, as shown in FIG. 1, a transmission type screen is known that has a lenticular lens on one side and a light shielding layer on the non-light condensing part of the lenticular lens l on the other side. When an image is projected onto such a transmission screen using a projection television from the lenticular lens surface with the lenticular lens l oriented vertically, the projected light is refracted in the horizontal direction by the action of the lenticular lens. Since the light is emitted over a wide area, it can be seen from positions other than the front if such a transmission screen is used.

However, in the above-mentioned transmission type screen, no consideration is given to the vertical direction, and the image light hardly reaches a position vertically shifted from directly in front, making it difficult to see. It is said that these vertical defects can be solved by scratching the exit side of the transmission screen in the horizontal direction (Jikkosho!r, 2-!/!; No. 3g), but it is still possible to observe the specified conditions. It is insufficient in terms of range setting and brightness unevenness within the range.

The present invention solves the drawbacks of the above-mentioned conventional techniques, and the transmission screen of the present invention has a particle size of a3~! rOtt
A lenticular lens is formed on one surface of a transparent substrate made of a transparent synthetic resin in which parts by weight of light scattering materials 03 to IO of m are mixed into ioo parts by weight of a transparent synthetic resin, and a lenticular lens is disposed on the other surface. It is characterized by having a light shielding layer in the light part.

As the synthetic resin constituting the transparent substrate of the present invention, those having the ability to form a transparent synthetic resin plate such as acrylic resin, vinyl chloride resin, styrene resin, polycarbonate resin, or acrylonitrile-styrene copolymer resin are used. .

Light scattering materials can be roughly divided into the following two groups based on their materials, and any of them can be used.

As organic light scattering materials, cross-linked acrylic resin, polyvinyl alcohol resin, sodium polyacrylate, fluororesin, polycarbonate resin, and melamine resin. These resins with relatively good heat resistance are preferred, but other general synthetic resins can also be used. Those having a large difference are appropriately selected and used from the viewpoints of solubility, transparency, deformability during molding, etc.

Glass, calcium carbonate, silicic acid,
or other metal oxides. These inorganic light scattering materials are appropriately selected and used in consideration of transparency, large difference in refractive index from synthetic resin, etc.

The above-mentioned organic or inorganic light scattering materials may be selected and used as appropriate, but among these, organic light scattering materials have good compatibility with the synthetic resin constituting the transparent substrate, and as described below. This is preferred because the light scattering material can be easily colored. or,
Compared to using inorganic light scattering materials, using organic light scattering materials has the advantage that screws and barrels are less likely to be damaged by wear and tear, and the hardness can be freely selected from flexible to hard. It is possible.

The above-mentioned light scattering material may be colored by appropriately using general pigments or dyes, and when such a colored light scattering material is used, the transmissive screen will be colored, so the reflectance of external light will be reduced. can be lowered. When coloring the light scattering material, it is easier to color the light scattering material using an organic light scattering material than an inorganic light scattering material, but coloring is also possible using an inorganic light scattering material.

The particle size of the light scattering material is 03~! rOμm is preferred, 0jμ
If the amount is less than !, the effect of addition will be poor, and! If it exceeds Oμ, it will be difficult to mix in, and the light transmittance will decrease and the image will become blurred, which is not preferable.

The light scattering material is the synthetic resin 100 that constitutes the transparent substrate described above.
It is preferable to add 0.3 to 10 parts by weight based on the weight part,
If it is less than 0.03 parts by weight, the effect of addition, that is, the light diffusion effect is poor, and if it exceeds 70 parts by weight, not only is no improvement in the light diffusion effect seen, but the light transmittance is decreased, which is not preferable.

The transmission screen of the present invention consists of a transparent substrate made of the above-mentioned composition, and its shape is as shown in Fig. 2, with a lenticular lens on one side and a rooster lenticular lens on the other side for non-light condensing. A light shielding layer 12 is provided at the top.

/4 in FIG. 2 indicates a light-scattering material. The light-shielding layer 12 may be formed not on the convex strips but on the flat end portions or the groove portions.

Since the transmission screen of the present invention has the above configuration, the emitted light is emitted not only in the horizontal direction but also in the vertical direction due to the action of the light scattering material, so that the observable range in the vertical direction is emitted. It is also wide.

Example Synthesis was carried out using acrylic resin beret (manufactured by Sumitomo Chemical Industries, Sumipex MH) as the synthetic resin and polyvinyl alcohol resin particles (particle size, 2jμ) containing 7% phthalocyanine blue (dye) as the light scattering material. The resin pellets and the light scattering material were mixed into pellets at a ratio of /θO:S (weight ratio), and after being molded into the shape shown in Figure 1 by extrusion molding, the convex stripes were molded using the gravure offset method. A light-shielding layer having a coating thickness of 3 μm was formed using a black two-component curing ink using polyurethane as a vehicle.

The resulting transmission screen had a diffusion effect in the vertical direction as well as the horizontal direction, and the image contrast was also good.

[Brief explanation of drawings]

FIG. 1 shows a conventional transmission screen, and FIG. 2 shows a transmission screen of the present invention, both of which are perspective views. / l φ...11... Lenticular lens l λ
......Light blocking layer/4 (...
...Light scattering material 7- Age 1 figure

Claims (4)

[Claims] (1) A transparent substrate made of a transparent synthetic resin in which 0.3 to 70 parts by weight of a light scattering material with a particle size o, , t A-s O/J m is kneaded into ioo parts by weight of a transparent synthetic resin. 1. A transmission screen comprising a lenticular lens on one surface and a light shielding layer on a non-light condensing part of the lenticular lens on the other surface. (2) The transmission screen according to claim 1, wherein the light scattering material is an organic light scattering material. (3) The transmission screen according to claim 1, wherein the light scattering material is an inorganic light scattering material. (4) The transmission screen according to any one of claims 1 to 3, wherein the light scattering material is colored.