JPH06258716A - Reflection type screen - Google Patents

Abstract

PURPOSE:To provide a screen which has sufficiently high reflection brightness, is wide in visual field region and enables video images even to be appreciated in a bright room by forming the fine ruggedness of plate texture at the time of printing on the surface of a printing layer with a nonaq. printing ink. CONSTITUTION:This reflection type screen is constituted by forming the printing layer 2 on the surface of a screen base material 1 consisting of metallic foil or metallic sheet having a specular reflection characteristic by using the transparent or black transparent nonaq. printing ink for which water is not used as a solvent and by forming the fine ruggedness 3 of the plate texture at the time of printing on the surface of the printing layer 2 formed with the nonaq. printing ink. Namely, the reflection efficiency is improved by adopting the metallic foil or metallic plate having the specular reflection characteristic as the screen base material 1. The surface of the screen base material is subjected to a fine hairline treatment in one direction, by which the reflected light is diffused and the visual field region is widened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type projection screen used when a motion picture film or a video image is projected from a projector onto a screen and the reflected image is observed.

[0002]

Conventionally, it has been common knowledge that such projection is performed in a dark room. One of the reasons is that the performance of the screen is insufficient.

The following are examples of conventional projection screens. White screen of white cloth, white PVC, etc. A screen in which pearl pigment or Al pigment is applied and formed on the surface of white vinyl chloride. A metal screen made by applying a dispersant such as silica or titanium dioxide to an aluminum foil or aluminum plate.

The white screen and the screen formed by applying a pearl pigment or an Al pigment have a low reflectance and cannot be viewed if they are used in a dark room. Compared to the former screen, the metal screen can be viewed in a bright room, but is insufficient in terms of screen brightness. As one of the causes of this, it is conceivable that the reflection efficiency is reduced by applying a dispersant for the purpose of eliminating hot spots (locally bright portions) generated on the metal reflecting surface and expanding the visual field region.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen which has a sufficiently high reflection brightness and has a wide field of view and which allows a projected image to be viewed even in a bright room.

[0006]

The present invention uses a transparent or black transparent non-aqueous printing ink that does not use water as a solvent on the surface of a screen substrate made of a metal foil or a metal plate having specular reflection characteristics. A reflection-type screen having a configuration in which a printing layer is formed, in which fine irregularities of printing plates are formed on the surface of the printing layer with a non-aqueous printing ink.

The invention of claim 2 is characterized in that a screen base material obtained by subjecting the surface of a metal foil or a metal plate to a unidirectional fine hairline treatment is used.

Further, the invention of claim 3 is a reflection type screen using an ultraviolet curable ink as the non-aqueous printing ink.

[0009]

By using a metal foil or a metal plate having a specular reflection characteristic as the screen base material, the reflection efficiency is improved.

Further, by applying a fine hairline treatment in one direction to the surface of the screen base material, the reflected light is diffused and the visual field area is expanded.

In this type of screen, the visual field region is regarded as a problem in the horizontal direction (especially when there are a large number of observers). Usually, the hairline processing is performed in the vertical direction (that is, The light reflected from the screen is diffused in the left and right directions).

Further, by forming a printing layer on the surface of the screen base material using a transparent or black transparent non-aqueous printing ink, it is possible to soften the specular reflection without hiding the metal of the screen base material. it can.

Further, by using an ultraviolet curable ink as the non-aqueous printing ink, it is possible to cure while maintaining the form of the ink film immediately after printing, and to form fine unevenness of the printing plate on the screen surface at the time of printing. It becomes easy to do.

[0014]

EXAMPLES Before explaining the examples, the principle will be described. Depending on the reflection efficiency n, the screen gain (S
If the incident angle with respect to the screen surface at G) and the observation point where the screen gain is halved is the half-value angle α, the result is as shown in FIG. 1. As you can see, the reflection efficiency n
The higher the value, the wider the field of view and the brighter the image can be viewed.

The screen gain (SG) is defined by the following equation. SG = {screen surface brightness (nit) / screen surface illuminance (lux)} × π

In the present invention, a printing layer is formed by using a non-aqueous ink that retains the color tone of the screen base material without hiding the metal of the screen base material, and printing the printing plate as it is on the surface to form irregularities. It is characterized by this. The composition of this non-aqueous ink is an ink obtained by mixing an alkyd resin, a vinyl chloride resin, an acrylic resin, a polyester resin, a polyamide resin, etc. with a suitable solvent, for example, xylene, toluene, acetone, petroleum ether. Some are manufactured as FD lyotone ink by Manufacturing Co., Ltd.

Explaining with reference to the drawings, FD lyotone ink manufactured by Toyo Ink Mfg. Co., Ltd. is used for the metal foil and the metal plate which are the screen substrate, and the screen line number is 200 to 30
After the screen printing of 0 lines / inch, the resin component is cured while leaving the printing plate to form fine irregularities on the surface. (FIG. 2) Further, it is clear that if the surface of the screen base material is subjected to a hairline treatment in one direction to emphasize the diffusion of reflected light in a specific direction, the visual field area further expands in that direction.
(Figure 3)

[0018]

As described above, a reflective screen having a high reflection efficiency, that is, a high screen gain and a wide field of view can be obtained, and a clear image can be viewed even in a bright environment.

[0019]

[Brief description of drawings]

FIG. 1 is a graph showing the correlation between screen gain and half-value angle.

FIG. 2 is an explanatory sectional view showing an embodiment of the reflective screen of the present invention.

FIG. 3 is a sectional explanatory view showing another example of the reflection type screen of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Screen base material 2 ... Printing layer with non-aqueous ink 3 ... Fine unevenness of plate 4 ... Hairline treatment part

Claims (3)

[Claims] 1. A printing layer is formed on a surface of a screen base material made of a metal foil or a metal plate having a specular reflection property, using a transparent or black transparent non-aqueous printing ink which does not use water as a solvent. The reflective screen is characterized in that fine irregularities of a printing plate are formed on the surface of the printing layer by the non-aqueous printing ink. 2. The reflection type screen according to claim 1, wherein a screen base material obtained by subjecting a surface of a metal foil or a metal plate to a fine hairline treatment in one direction is used. 3. The reflective screen according to claim 1, wherein an ultraviolet curable ink is used as the non-aqueous printing ink.