JPH03119334A - Reflection type screen - Google Patents

Abstract

PURPOSE:To obtain a bright screen which is appropriate for the projection of a projection type television by printing or coating ink in which substance obtained by mixing an A1 scale and a pearl pigment scale coated with titanium dioxide with mica as a base is used as a filler on a plastic film or a sheet. CONSTITUTION:A layer consisting of the ink in which the substance obtained by mixing the A1 scale and the pearl pigment scale is used as the filler is provided on the plastic film or the sheet to obtain a light reflection layer. As the pearl pigment scale, the filler obtained by coating the titanium dioxide with the natural mica as the base is used, and the filler whose coating rate of titanium is 14-43% and whose grain size of the scale is 5-200mum is used. Thus, the bright screen in which reflection brightness is high is obtained. Since a distinct angle is large, an image brighter than that in a conventional manner is enjoyed even in the case that the image is projected on the screen from a projection type television projector which is somewhat lacking in the light quantity of a light source.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a bright reflective screen with high reflective brightness.

OHPs have become popular and are widely used in schools, companies, etc., but if the light source is bright and there is no screen, images, letters, etc. can be seen even on white walls.

Usually, screens made of PVC with white surfaces were often used. Also, as a high-grade screen, a bead-shaped screen whose surface is treated with glass beads to increase reflective brightness is used.

In recent years, projection televisions have appeared on the market, but it is not possible to increase the brightness of the light source, and in order to obtain a bright image on the screen, there is a growing demand for a brighter screen with better reflective properties than before. There is.

The screen of the present invention provides a bright screen suitable for projection television.

<Prior art and its problems> As for the conventional technology, ■When an image is projected from an OHP or the like onto a white wall, the surface of the white wall becomes matte. Therefore, the light projected onto the screen is reflected in random directions. An observer can see the image from anywhere in front of the screen, but the disadvantage is that the image is dark.

■In the case of white PVC screen sheets, the surface is embossed to give the reflected light a certain degree of directionality (so that the reflected light is not scattered along the edges) and to improve brightness. , no noticeable improvement was obtained.

■Particle size 40μm to 200μm on white PVC sheet
There is a device that increases the reflected brightness by arranging glass beads evenly, but the brightness does not increase as much as expected, even though the angle of clear vision becomes narrower.

Furthermore, there are various problems such as equipment for processing glass beads, cost, and processing quality.

As mentioned above, there are various conventional techniques, each of which has its own drawbacks.

〈Means for solving problems〉 The invention will now be described in detail.

The present invention provides aluminum on a plastic film or sheet.
This is a reflective screen characterized by providing a light reflective layer by providing a layer made of ink containing a mixture of 111 pieces and pearl pigment scales as a filler.

As the plastic film or sheet used in the present invention, a vinyl chloride film or sheet using a white pigment is preferable, but a black one may also be used in consideration of hue contrast during projection.

In addition, the amount of plasticizer added should be 40 parts or less (hereinafter referred to in this specification) considering suitability for printing and coating.
...Parts means the amount of plasticizer added minus the percentage. ) is desirable.

In addition, as a result of intensive study, AI scales are non-leafing type and have a size of 5 μm to 50 zm (average particle size 13 μm).
Particles with a particle size of Good in terms of stability and uniformity.

In addition, as a result of intensive study, we found that the pearl pigment scales are a type of filler that has natural mica as a matrix and is coated with titanium dioxide, with a titanium coverage of 14% to 43% and a particle size of 5 μm.
A scale-like material with a diameter of ~200 am can be used. Among them, scale-like particles with a titanium coverage of 28% and a particle size of 5 μm to 60 μm (average particle size 30 IIm) are the most effective when considering stability during printing and coating.

Further, as the coating method, any ordinary printing or coating method such as gravure printing, roll coating, commer coating, knife coating, silk screen printing, etc. may be used.

In this case, it is necessary to coat at least a uniform thickness, but in the gravure printing method, a thin ink film of 0.1 to 20 μm can be formed by selecting the cell depth. Knife coating, silk screen printing, etc. can form a thick ink film with a thickness of 5 to 1100 a.

However, the ink film thickness is preferably about 0.5 to 60 .mu.m, and 2 to 30 .mu.m is particularly good in terms of economical efficiency and reflective effect.

Further, after printing or coating with the pearl pigment, it is also good to coat with OP varnish containing silica powder or the like in order to protect the surface and stabilize the clear viewing angle.

According to the present invention, compared to a case where only a paste ink containing AI scales as a filler is used as a light reflection layer, by using a mixture (mixing) of pearl pigment as a filler, the half value angle ( The reflected brightness directly in front of the screen is
1/2) can be further widened.

<Example><Example-1> White PVC film (manufactured by Riken Vinyl) 23 parts, t (thickness) = 0.2 mm, were coated with ink (a) having the following composition using a gravure printing method. A prototype screen (3) was obtained.

(A) Light reflective ink The printing conditions were as follows: cell depth 80 μm (D) A lattice engraving gravure plate was used, and the ink film thickness was 8 μm.

This prototype (3) was measured using a luminance meter and a lux meter manufactured by Tokyo Kogaku Co., Ltd. to determine the screen gain value and (SC value).
′.

Total: 100 parts by weight The AI paste is manufactured by Toyo Aluminum Co., Ltd. 708O
The powder was pulverized using N in a ball mill for 48 hours to give an average particle size of 13 μm, and the zero particle size distribution was 7 to 44 μm.

In addition, the pearl pigment was obtained from Merck Co., Ltd., Merck Japan Co., Ltd., and had a titanium dioxide coverage of 28% and a particle size of 1.
A material having a diameter of 0 to 60 μm was used.

As described above, an unprecedented screen with improved SG value and half-value angle was obtained.

<Effects of the Invention> As explained above, according to the screen according to the present invention, a bright screen with high reflective brightness can be obtained, and the clear viewing angle is wide, so that it can be used from a projection type television projector where the amount of light from the light source is insufficient. Even if the image is projected on a screen, you can enjoy a brighter image than before.

Patent application: Toppan Printing Co., Ltd. Representative: Kazuo Suzuki Procedural amendment (spontaneous) July 2, 1990 Patent application No. 258589, 1999 2, title of invention Reflective screen 3, person making amendment and case Relationship between Patent Applicant Address: Taito-5-1, Taito-ku, Tokyo, Column 5 of the Detailed Description of the Invention in the Specification and the Detailed Description of the Invention in the Statement of Contents of the Amendment are amended as follows.

A. The table following "Determined..." on page 8, line 6 of the specification is amended as follows.

Claims (4)

[Claims] (1) A light-reflecting layer is formed by printing or coating a plastic film or sheet with an ink containing a mixture of Al scales and pearl pigment scales coated with titanium dioxide using mica as a matrix as a filler. reflective screen. (2) The reflective screen according to claim 1, wherein the Al scale filler is a non-leafing type with a particle size of 5 μm to 50 μm (average particle size 13 μm). (3) Pearl pigment scales cover 28% of titanium dioxide
2. The reflective screen according to claim 1, wherein the reflective screen has a particle size of 5 μm to 60 μm (average particle size of 30 μm). (4) The reflective screen according to claim 1, wherein the plastic film or sheet is made of vinyl chloride resin.