JPH0792589B2 - High quality screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a high-quality screen, and an object thereof is to obtain a sharp image having a sharp and three-dimensional effect due to overlapping reflection, and more than 130 degrees. An object of the present invention is to provide a high-quality screen which has a wide viewing angle and can reliably see the projected image from a long distance and in a bright place.

(Prior Art) Conventionally, a white screen or a silver screen using a transparent glass ball, aluminum metal powder, or the like has been best known as a reflective luminescent material of a projection screen.

However, when light is projected onto glass spheres, aluminum metal powder, etc., the amount of light reflected by these fine powders not only decreases to a small extent with respect to the projected light amount, but also
There was a considerable difference in the brightness of the image in the central part of the screen and its peripheral part, and as a result, there was the problem that it was not possible to see an image of uniform brightness over the entire screen.

Further, in the above-mentioned screen, there is a problem that the contrast is low due to halation, and the color of the obtained image is brownish as a whole and is difficult to see.

Therefore, when such a screen is used, it is usually necessary to turn off the lights in the room and block the light coming from the room to perform projection.

On the other hand, as a solution to the problems with conventional white or silver screens such as halation, low contrast, difficulty in viewing, and viewing in dark places, a screen using swordfish fish scale powder is disclosed in Japanese Patent Publication No. 34-4939. And Japanese Patent Publication No. 39-11535.

That is, in Japanese Examined Patent Publication No. 34939/1989, a paste resin in which vinyl chloride is mixed with a mixed plasticizer is added fish scale powder to swordfish, and a mixture of this mixture with cyclohexanone is spray-coated on a vinyl sheet or vinyl leather surface. Screen was disclosed.

Further, in Japanese Patent Publication No. 39-11535, a blackish projection is obtained by spray-coating fish scale powder of swordfish, or a similar colorless and transparent parallel flat thin plate microcrystalline substance on a black vinyl sheet or black vinyl leather surface. Screen was disclosed.

Further, in place of the conventional screen using transparent glass balls or aluminum powder, the following screen has been disclosed.

That is, Japanese Patent Publication No. 35-7538 discloses a projection screen in which a white opaque base surface is coated with a lacquer containing a lead compound having a thin plate-like or plate-like crystal structure such as basic carbonate. It had been.

Further, in JP-A-49-103627, the particle size is 0.
A sheet of a thermoplastic resin composition made of a high-impact polystyrene polymer containing an inorganic powder having a refractive index of 1 to 1.0 μ and a range of 1.4 to 2.8, and a screen surface material having a rough surface. It was disclosed.

(Problems to be Solved by the Invention) However, Japanese Patent Publication No. 34939/34 and Japanese Patent Publication No.
The scabbard fish scale powder disclosed in Japanese Laid-Open Patent Publication No. 11535 has a problem that it is difficult to obtain a certain quality because it is a natural product, and variations in quality are likely to occur, resulting in very poor yield and poor reproducibility. Existed.

Moreover, there is a problem that this swordfish scale powder is not available industrially because the production amount is very small at present and the price is high.

Furthermore, when the reflector particles made of swordfish fish scale powder are applied to the screen substrate, if these reflector particles combine to form a rough surface with varying sizes, the incident light from the projector will be projected to the front. There was also a problem that the amount of reflected light would be 1/3 to 1/5.

On the other hand, in the reflective layer made of "basic lead carbonate having a particle size of 6 to 20 .mu. And a thickness of 1 .mu." Disclosed in JP-B-35-7538, a sharp and three-dimensional vivid image can be sufficiently obtained. There was a problem that the image could not be viewed reliably even in a bright environment.

Further, in the technology disclosed in JP-A-49-103627,
There was a problem that the brightness of the obtained image was as narrow as 40 to 45 degrees and it was not a screen with an extremely clear viewing angle.

Therefore, in the industry, it is possible to project an extremely clear and sharp stereoscopic image without halation, etc., and yet with an extremely wide visual angle, it is possible to reliably view the projected image even from a distance or in a bright environment. It was desired to create an excellent high quality screen.

(Means for Solving the Problems) In the present invention, a black screen substrate and a reflective layer spray-coated on the surface of the black screen substrate are used, and the reflective layer has a particle diameter of 30 μm or less and a thickness of 0.15 μm or less. Formed from a mixture of reflector particles composed of one or more colorless and transparent parallel plane thin plates selected from among bismuth chloride and titanium oxide-coated mica and a colorless and transparent fixing agent, and in the mixture, By providing a high quality screen characterized in that reflector particles are mixed in an amount of 5 to 15 parts by weight, the above-mentioned conventional problems are alleviated.

(Structure of the Invention) The structure of the high-quality screen according to the present invention will be described in detail below.

The high quality screen of the present invention comprises a black screen base material and a reflective layer.

A black plastic panel or sheet is most suitable for the screen substrate, and specific examples thereof include acrylic resin, polyester resin, acrylic-butadiene-styrene copolymer (ABS) resin, vinyl chloride resin, urethane resin, fiber resin, and alkyd. A resin or the like is preferably exemplified, and any black panel or black sheet having a flat and even plane such as glass fiber reinforced resin (FRP) can be preferably used.

A reflective layer is spray coated on the surface of the black screen substrate.

In the present invention, the reflective layer is composed of a mixture of reflector particles and a colorless and transparent fixing agent.

The fixing agent is used to apply the reflector particles to the surface of the screen substrate, and its composition is acrylic resin,
Vinyl chloride resin, polyester resin, fiber derivative,
There is no particular limitation as long as it adheres well to the screen substrate such as urethane resin or alkyd resin and has little yellowing.

As reflector particles (synthetic thin plate crystals), the particle size is 30 μm
In the following, one or two or more colorless and transparent parallel plane thin plates selected from basic lead carbonate foil having a thickness of 0.15 μ or less, bismuth oxychloride foil, and titanium oxide-coated mica foil are used. .

The reason why the particle size of the reflector particles is 30 μm or less is as follows.
If the particle size exceeds 30 μ, it is not preferable because the reflection surface becomes rough when applied to the screen base material, and the amount of light reflected on the front surface is significantly reduced.

The reason that the thickness of the reflector particles is 0.15 μm or less is that when the particle thickness exceeds 0.15 μ, the distortion of the incident light and the reflected optical axis becomes large, and the repeated reflection (an extremely thin colorless transparent parallel flat surface) is performed. (One particle that forms a layer with a face plate repeatedly reflects the incident light in each particle within the one particle, and almost all of the incident light is reflected as parallel rays by overlapping on the same optical axis.)
This is because it does not occur and is accompanied by halation and cannot be used, and it is also undesirable because it causes light bleeding (irradiation) and deteriorates the contrast.

Furthermore, as the reflector particles, in particular, one or two or more kinds of colorless and transparent parallel plane thin plates selected from basic lead carbonate foil, bismuth oxychloride foil, and titanium oxide-coated mica foil are used. This is because it is based on the experimental knowledge of the present inventors that an extremely clear and sharp stereoscopic image can be viewed by using.

Moreover, when such a reflector particle is applied to the screen substrate, it is uniformly arranged on the surface of the screen substrate, the amount of reflected light does not decrease, and it can be preferably used in the present invention.

In the present invention, the solvent of the paint (adhesive) may be any one that can sufficiently dissolve the resin used, has good coating workability, and has no effect on the screen substrate. For example, aroma such as toluene and xylene. Group-based, petroleum hydrocarbon-based, esters, ketones, alcohols, glycol ethers and the like can be used.

The high-quality screen of the present invention can be obtained by coating the mixture obtained by mixing the above-mentioned reflector particles with the above-mentioned coating material on the surface of the black screen substrate in a film thickness of 5 to 20 µ.

The reason why the coating thickness is 5 to 20μ is that the coating thickness is 20μ.
If it exceeds 0, the brightness will be high, but the reproducibility of blackness will be poor and true black will not appear. On the other hand, if it is less than 5 μ, the brightness will be insufficient and unclear, which is not preferable in any case. Is.

When a high-quality screen obtained in this way is projected from a projector, etc., the incident light undergoes multiple reflections and screen aberration does not occur, and halation between particles does not occur, so a sharp image with high contrast can be obtained. To be

Further, since the light is not weakened to a distant place due to the nature of the reflector particles, it is possible to surely see even from a long distance.

Brightness is wide at 130 degrees or more, and the area within a uniform clear vision angle is 100.
%.

Moreover, the image is sharp because there is no light blur.

Also, because it is a black screen with no halation and the image is sharp,
There is little effect of room light, and it is possible to install a residual light for notes.

Moreover, red, blue, and green can be reproduced clearly, and the primary colors can be reproduced as they are, which is very easy to see.

Therefore, it is an indispensable screen for high-quality video projectors, and is suitable for slide projection for academic research that requires high image quality.

(Effects of the Invention) As described in detail above, the present invention comprises a black screen base material and a reflective layer spray-coated on the surface thereof, the reflective layer having a particle diameter of 30 μm or less and a thickness of 0.15 μm or less. , A bismuth oxychloride, a titanium oxide-coated mica, or one or more kinds of colorless transparent parallel plane thin plate reflector particles formed from a mixture of a colorless transparent adhesive and Since it is a high-quality screen characterized by being mixed with 5 to 15 parts by weight of the above-mentioned reflector particles, a sharp, three-dimensional and sharp image can be obtained due to multiple reflections on the screen surface, and a wide bright image can be obtained. This has an excellent effect that the image can be surely viewed even at a long distance or in a bright environment with a viewing angle.

(Example) Next, the effect of the high-screen according to the present invention will be further clarified by using Examples and Comparative Examples.

(Examples 1 to 3 and Comparative Examples 1 to 4) The paints for screens shown in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared, and the paints were applied to a vinyl chloride sheet (black) having a thickness of 0.4 mm to a thickness of 10 µm. A high-quality screen was prepared by coating so that

About this high quality screen, the degree of halation,
The image sharpness, primary color reproducibility, clear viewing angle, and stereoscopic effect were tested.

(Example 1) 25 parts by weight of Dianal LW106 (acrylic resin varnish NV50% manufactured by Mitsubishi Rayon Co., Ltd.), 12 parts by weight of basic lead carbonate foil (average particle thickness 0.05 μm), 33 parts by weight of toluene, and xylene 30
Parts by weight were used in combination.

The results are shown in Table 1.

(Example 2) 25 parts by weight of Dianal LW106 (acrylic resin varnish NV50% manufactured by Mitsubishi Rayon Co., Ltd.), 10 parts by weight of bismuth oxychloride foil (average particle thickness 0.05 μm), 33 parts by weight of toluene, and 32 parts by weight of xylene were used. Used in combination. The results are shown in Table 1.

(Example 3) 25 parts by weight of Dianal LW106 (acrylic resin varnish NV50% manufactured by Mitsubishi Rayon Co., Ltd.), 10 parts by weight of titanium oxide-coated mica foil (average particle thickness 0.05 μm), 33 parts by weight of toluene, 32 parts by weight of xylene Was used. The results are shown in Table 1.

(Comparative Example 1) 25 parts by weight of DIALN LW106 (acrylic resin varnish NV50% Mitsubishi Rayon Co., Ltd.), 10 parts by weight of aluminum powder (average particle thickness 0.2 μm), 33 parts by weight of toluene, 3 parts of xylene
2 parts by weight were compounded and used. The results are shown in Table 1.

(Comparative example 2) 25 parts by weight of Dinar LW106 (acrylic resin varnish NV50% manufactured by Mitsubishi Rayon Co., Ltd.), 10 parts by weight of basic lead carbonate foil (average particle thickness 0.2 μm), 33 parts by weight of toluene, 32 parts of xylene
Parts by weight were used in combination.

The results are shown in Table 1.

(Comparative Example 3) 25 parts by weight of Dianal LW106 (acrylic resin varnish NV50% manufactured by Mitsubishi Rayon Co., Ltd.), 10 parts by weight of bismuth oxychloride foil (average particle thickness 0.3 μm), 33 parts by weight of toluene, and 32 parts by weight of xylene were used. Used in combination. The results are shown in Table 1.

(Comparative example 4) 25 parts by weight of DIALNAL LW106 (acrylic resin varnish NV50% manufactured by Mitsubishi Rayon Co., Ltd.), 10 parts by weight of titanium oxide-coated mica foil (average particle thickness 0.3 μm), 33 parts by weight of toluene, 32 parts by weight of xylene Was used. The results are shown in Table 1.

(Condition 1) In the item “degree of halation”, 10 screens without halation were set.

(Condition 2) In the items of "contrast", "primary color reproducibility", and "stereoscopic effect", the effect on a screen using 100% fish scale powder as the reflector particles was set to 10.

The points are shown to 20 panelists and 100% as reflector particles.
A screen using a fish scale powder and a screen in the example and the comparative example are screened with an image and asked to compare each item, and the fish scale screen is a maximum of 10 points,
Relatively scoring each screen for each item,
The average value is taken.

As is apparent from Table 1 above, the performance of the screen according to the present invention using the reflector particles made of basic lead carbonate foil having an average particle thickness of 0.15 μm or less, bismuth oxychloride foil, and titanium oxide-coated mica is: It has better average particle thickness than 0.15μm and more than reflector particles made of aluminum powder, and its performance is no better than that using swordfish scale powder as reflector particles. I know there isn't.

It can be seen that the performance is remarkably inferior when the reflector particles are aluminum powder.

In addition, even if basic lead carbonate, bismuth oxychloride, or titanium oxide-coated mica is used as the reflector particles, the particle thickness is
It can be seen that when it exceeds 0.15μ, the performance is significantly deteriorated.

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Claims (1)

[Claims] 1. A mica coated with basic lead carbonate, bismuth oxychloride, and titanium oxide, which comprises a black screen base material and a reflective layer spray-coated on the surface thereof, the reflective layer having a particle diameter of 30 μm or less and a thickness of 0.15 μm or less. Is formed from a mixture of reflector particles consisting of one or more kinds of colorless and transparent parallel plane thin plates selected from among the above, and colorless and transparent fixing agent, and the reflector particles in the mixture are 5 to 15 A high-quality screen characterized by being mixed in parts by weight.