JPH03249634A - Projection type screen - Google Patents

Abstract

PURPOSE:To obtain a bright projected image having high reflection brightness by forming a 1st light reflection layer on the surface of a plastic film which is a base material and printing and forming ink having high reflectance which is a 2nd light reflection layer on the 1st layer. CONSTITUTION:The 1st light reflection layer 2 is formed on the surface of the plastic film 1 which is the base material and the ink having the high light reflectance which is the 2nd light reflection layer 3 is printed and formed on the 1st layer 2. Soft PVC resin, etc., is used as the plastic film 1. It is desirable to use a material having high light reflectance as the light reflection layer, and it is satisfactory to use paste ink in which a nobn-leafing type Al scale whose grain size is 5-50mum(average grain size is 13mum) is used as filler as the 1st light reflection layer 2. It is satisfactory, visually, to use ink in which a pearl pigment scale which is obtained by coating mica with titanium dioxide and whose coating rate is 28% and whose grain size is 5-60mum(average grain size is 30mum) is used as filler as the 2nd light reflection layer 3. Thus, the bright image having high reflection brightness is obtained at the time of projecting a video.

Description

[Detailed Description of the Invention] <Industrial Application Field> In recent years, projection type television cameras using liquid crystal panels, etc. have appeared on the market, but it is necessary to increase the brightness of the light source.
There is a limit and in order to get a bright image on the screen,
There has been an increasing demand for brighter screens with better reflective properties than conventional screens.

The present invention relates to a reflective screen suitable for viewing a projected image of a projection television.

<Prior Art> In order to view the projected image reflected on the screen as a bright image, the following is a prior art that improves the light reflection layer on the surface of the screen.

(1) Paste ink filled with A1 scales was printed on the surface of the base material to form a light reflective layer. (Patent Application Hei 1-
No. 236561) (2) An ink containing pearl pigment scales made of mica coated with titanium dioxide is printed on the surface of a base material to form a light-reflecting layer. (Special application Hei 1
-236562) <Problems to be Solved by the Invention> In a reflective screen, it is an important factor to improve the reflective brightness and obtain a bright image.

According to the above-mentioned conventional technology, when a light reflective layer is formed by gravure printing to improve productivity, the layer thickness is thin (
0.1 to 20 μm), the ink is not printed in some areas, and the surface of the base material (the part corresponding to the mountain of cells of the gravure plate) is exposed.

When viewing a projected image on such a screen, the reflected brightness decreases due to the exposed portion of the base material surface, and the image is not necessarily satisfactory.

The present invention aims to provide a screen that has sufficient reflective brightness when a light reflective layer is formed on the surface by printing.

<Means for Solving the Problems> The present invention comprises forming a first light-reflecting layer on the surface of a plastic film (sort) as a base material, and further forming a light-reflecting layer on top of the first light-reflecting layer to become a second light-reflecting layer. This is a reflective screen characterized by being printed with high-quality ink.

<Details of the invention The configuration of the reflective screen will now be described.

Plastic film (sheet) that serves as the screen base material
As the material, soft PVC (vinyl chloride) resin, polyester resin, polyolefin resin, polyamide resin, etc. can be used.

The amount of plasticizer added to the resin is 40 parts or less (hereinafter referred to in this specification as...
Parts means the amount of plasticizer added (percentage).

As the light-reflecting layer, a material with high light-reflectivity is desirable in order to increase the reflective brightness of the screen.

The following can be considered as the first light-reflecting layer.

(a) Paste ink using non-leafing type Allll pieces with a particle size of 5 μm to 50 μm (average particle size 13 μm) as a filler.

(b) Al vapor-deposited layer The second light-reflecting layer is made of burl pigment scales made of mica coated with titanium dioxide, with a coverage rate of 28% and a particle size of 5 μm to 60 μm (average particle size of 3
Ink with a filler of 0μm).

is visually pleasing.

After forming the second light-reflecting layer, if necessary, an OP containing silica powder, etc. A varnish may be coated to correspond to the light reflecting layer.

<Function> In the screen according to the present invention, even when a thin second light-reflecting layer is formed by gravure printing, the surface (portion with low reflective brightness) of the plastic film (sheet) that is the base material is partially Since the first light-reflecting layer (portion with high reflective brightness) is partially exposed without being exposed to the light, the reflective brightness is high during image projection, and a bright image can be obtained.

<Example><Example1> (1) A first light-reflecting layer (layer thickness: 2°) was applied to the surface of a white PVC film (23 parts, manufactured by Riken Vinyl) as a screen base material using the ink and printing conditions shown below. 3 μm) was formed. (Sample No. 3) Al paste ink salt vinyl acetate resin 20 parts by weight A1 paste 7 〃MEK/) Luene-1/1
73 total 100 ・Printing conditions: lattice engraving gravure plate with a cell depth of 45 μm, Al paste used 708ON manufactured by Toyo Aluminum Co., Ltd., and was finely pulverized in a ball mill at 488r, with an average particle size of 13
It was set as pm. The particle size distribution was 7 μm to 44 μm.

(2) On the surface of sample N003 obtained in (1),
A second light-reflecting layer was formed in the same manner as in (1) except that the ink shown below was used (layer thickness: 2°2μ
m) Obtained a sample of the screen. (Sample No. 4
) - Burl pigment ink Salt vinyl acetate resin 20 parts by weight Pearl pigment
25 MEK/toluene = 1/1
55 Total 100 〃 The pearl pigment is (manufactured by Merck Co., Ltd., Merck Japan Co., Ltd.)
) Titanium dioxide coverage rate 28%, particle size 10 μm ~ 60〃
m was used.

<Example 2> (1) As a screen base material, a 600-layer thick 0A1 vapor deposition layer was formed as a first light reflective layer on the surface of a 38 μm thick polyester film (Lumirror S type) by vacuum vapor deposition. (Sample No. 5) (2) (A second light-reflecting layer was formed on the surface of sample No. 093 obtained in 11 in the same manner as in Example 1 (2), and (Ji! 2.2 μ
m) Obtained a sample of the screen.

(Sample No. 6) <Comparative Example> The following sample was prepared for comparison with the screen according to the present invention.

(Sample No. 1) White PVC film (23 parts, made by Riken Vinyl) only.

(Sample No. 2) Transparent beads (9 particles made of glass with a diameter of 100 μm) were arranged on the − side on the surface of sample No. 001.

(Sample No. 3) A light reflecting layer was formed on the surface of sample No. 11 in the same manner as in Example 1 (2).

The optical properties of Samples 1 to 6 described above were examined. The results are shown in Table 1 below.

The optical characteristics were measured using a luminance meter and a lux meter manufactured by Tokyo Kogaku ■, and the screen gain value (
SG value) and the half-value angle (the angle at which the reflected brightness directly in front of the screen becomes 1/2) were determined.

Table-1 As can be seen from Table-1, the screen according to the present invention (sample No. 4.6) is different from that of the prior art (sample No. 1).
-3.6), improvements were seen in reflected brightness and clear viewing angle.

<Effects of the Invention> As explained above, according to the screen of the present invention, a bright projected image with high reflected luminance can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing a reflective screen according to the present invention. 1...Screen base material 2...First light reflective layer 3...Second light reflective layer Patent Applicant: Toppan Printing Co., Ltd. Representative Kazuo Suzuki Procedural Amendment (Voluntary) 1゜ Incident Indication 1990 Patent Application No. 47 069 2゜Name of the invention Reflective screen 3゜Relationship with the amended case

Claims (1)

[Claims] 1) A first light-reflecting layer is formed on the surface of a plastic film (sheet) serving as a base material, and a highly light-reflecting ink is further applied thereon to serve as a second light-reflecting layer. A reflective screen characterized by being formed by printing. 2) The reflective screen according to claim 1, wherein a paste ink containing non-leafing type Al scales having a particle size of 5 μm to 50 μm (average particle size 13 μm) as a filler is used as the first light reflective layer. . 3) The reflective screen according to claim 1, wherein an Al vapor deposited layer is used as the first light reflective layer. 4) As a highly light-reflecting ink that becomes the second light-reflecting layer, filler is pearl pigment scales made of mica coated with titanium dioxide, with a coverage of 28% and a particle size of 5 μm to 60 μm (average particle size 30 μm). The reflective screen according to any one of claims 1 to 3, characterized in that an ink of