JPH0398039A - Reflection type screen - Google Patents

Abstract

PURPOSE:To enhance brightness and to widen a bright visual angle by printing or coating a plastic film or sheet with Al paste ink. CONSTITUTION:The paste ink contg. Al flakes as filler is printed or coated the plastic film or sheet or this film or sheet is coated with this ink to form a light reflecting layer. The coating method may be ordinary printing or coating methods, such as gravure printing, roll coating, comma coating, knife coating, and silk screen printing. The bright screen having the high reflection brightness is obtd. in this way and the brighter images than heretofore are enjoyed even with the images projected onto a screen from a projection type television projector with which the light quantity of a light source is likely to be insufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bright reflective screen sheet with high reflective brightness.

OHP. has become popular and is 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 a white wall.

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 a homepage, etc. 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 a screen sheet made of white PVC, the surface is embossed to give the reflected light a certain degree of directionality (so that the reflected light is not scattered in the surrounding area) and improve brightness. However, no noticeable improvement was obtained. ■There is a method in which glass beads with a particle size of 40 μm to 200 μm are arranged uniformly on a white PVC sheet to increase the reflected brightness, but the brightness does not increase as much as expected, even though the clear viewing angle 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 technologies, each of which has its own drawbacks. In order to solve these drawbacks, the present invention has adopted the following tS precepts as a result of intensive study. Means for Solving the Problems> The present invention will be described in detail. The present invention provides aluminum on a plastic film or sheet.
Printed or coated with paste ink, this is a reflective screen with unprecedented brightness and a wide viewing angle. As the plastic film or sheet used in the present invention, a white PVC film or sheet using a white pigment is desirable.

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 = percentage. ) is desirable. Further, as a result of extensive research, it has been found that a non-leafing AlM piece type with a particle size of 5 μm to 50 μm is good for the Al paste ink. However, particles with larger diameters can be used, but the reproducibility
Some problems remain due to the density of A1 scales as a reflective layer. Further, the coating method may be a conventional printing or coating method such as gravure printing, roll coating, commer coating, knife coating, or silk screen printing. In this case, it is necessary to coat at least a uniform thickness, but in the gravure printing method, depending on the selection of cell depth, a thin ink film of 0.1 to 20 μm can be produced, such as commer coating, Knife coating, silk screen printing, etc. can form a thick ink film with a thickness of 5 to 100 pm. Further, after printing or coating with the above-mentioned Burr 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. <Example> The following examples are shown in Example-1 A reflective layer was formed on a white PVC film (23 parts, manufactured by Riken Vinyl Co., Ltd.) using the ink and printing conditions shown below, and a screen sample was prepared. (+) Al paste ink Salt PVC resin 20 parts by weight A1 paste 7 parts by weight MEK/l-luene = 1/1 73 parts by weight Total 100 parts by weight (2) Printing conditions Grid engraving gravure plate with cell depth of 45 μm Also, Al The paste was finely pulverized for 48 hours using a ball mill using 7080N made by Toyo Aluminum ■, and the average particle size was 13 μm.
And so.

The particle size distribution was 7 μm to 44 μm.

The screen gain (SC) value of this sample was determined using a luminance meter and a lux meter manufactured by Tokyo Kogaku ■.

As a result, the SG value was 5.0. Further, the white PVCOSG value used for the base film as a reference was 2.9.

Also, when measuring the clear vision angle, if it is 0°, it is 5. 0, the half value angle was ±20°.

Also, glass beads n = 2. 2,
Particles with a particle size of 90 μm to 106 μm were surface-treated using a transparent adhesive (acrylic resin). The SG value of this sample was 2.7. Further, the half-value angle was ±20°.

As a result of the above, a very good non-conventional sample 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 an image projected onto the screen from a projection type television projector with insufficient light source light intensity can be obtained. Even with this, you can enjoy brighter images than before. Patent application: Toppan Printing Co., Ltd. Representative Kazuo Suzuki Procedural amendment (spontaneous) 1990/Work month 2 Date of 1999 Patent Application No. 236561 2. Name of the invention Reflective screen 3. Relationship with the case of the person making the amendment Address of the patent applicant: 5-1 Taito 1-chome, Taito-ku, Tokyo Column 5 for detailed description of the invention in the specification. The detailed description of the invention column in the description of the amendment shall be amended as follows. A. Page 6, line 17 of the specification “...SG value is 5.0
Met. J as ``...SG{1!! was 3.l.
It was 1.0. ” and corrected. C. In the case of ``...0'' on page 6, item 201, 5.
O and J are corrected as ``...3.1 for 0°.''
D. The first line of page 7 of the specification indicated "...±20".
” to “...showed ±15°.”! ili Correct. E
, page 7, line 6 of the specification, ``...2.7''. Amend J to ``...2.3.'' F. Page 7, line 7 of the specification shows "...±20".

Claims (3)

[Claims] (1) A reflective screen characterized in that a light reflective layer is formed by printing or coating a plastic film or sheet with a paste ink containing Al scales as a filler. (2) The reflective type according to claim 1, characterized in that the light reflecting layer is a layer made of a paste ink containing non-leafing type Al scales as a filler having a particle size of 5 μm to 50 μm (average particle size of 13 μm). screen. (3) The reflective screen according to claim 1, wherein the plastic film or sheet is made of vinyl chloride resin.