JPH0636049U - Reflective screen - Google Patents

Abstract

(57) [Summary] [Structure] A reflective screen comprising a plurality of laminated layers, the light diffusion layer having fine projections and depressions on the projection surface, a semi-transparent black thin layer, a light reflection layer, and a reinforcing layer. It is characterized by being sequentially stacked. [Effect] It is possible to provide a very clear and good-contrast image.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reflective screen for projecting images such as movies, slides and videos by a projector.

[0002]

[Prior art]

 Conventionally, as a reflection type screen, a screen whose projection surface is made of a cloth or a film with a white background, or a bead screen in which minute glass beads are attached to the film surface via an adhesive is widely used. In addition, recently, a projection surface formed on the light-reflecting surface has fine irregularities to widen the viewing angle so that many people can see a bright image uniformly from a wide range, and the projection surface. There is a screen where a clear image is obtained by applying or printing a reflection agent on the surface or kneading it.

However, since these reflective screens do not have a sufficient contrast between white and black, the image is not clear, and the slight amount of light other than the projection light source (hereinafter referred to as “external light”) causes the entire image to be displayed. It has the drawback of being blurred. In order to improve this, a reflective screen in which a light-reflecting agent is coated or printed on a black film has been proposed, but it is reflected because the projection light rays are absorbed by parts other than the reflecting agent. It is difficult to obtain a bright image because the amount of light rays decreases.

[0004]

[Problems to be solved by the device]

 The present invention improves the contrast between black and white in the image, so that a clear image can be obtained even in the place where the external light is received, and the projection light ray is less absorbed by the screen surface and is reflected. It is an object of the present invention to provide a reflective screen that can obtain bright images by increasing the amount.

[0005]

[Means for Solving the Problems]

 The present invention is a reflective screen in which a light diffusing layer having fine irregularities on a projection surface, a semi-transparent black thin layer, a light ray reflecting surface layer and a reinforcing layer are sequentially stacked.

The light diffusion layer in the present invention is preferably made of a transparent or translucent resin thin layer with or without a light spreader such as scale-like or powdery mica, metal, etc., and has fine irregularities on the surface. It is a thing. The means for containing the light diffusing agent in the layer may be a known method such as kneading into a resin, coating the resin layer surface with a binder by a coating method, a printing method, or spraying an adhesive after coating. is there. For fine irregularities on the surface of the layer, physical methods such as sandblasting or embossing, chemical methods such as chemical etching, or coating with a mixture of the above-mentioned fine powder or coating with an adhesive agent is performed. After that, it can be formed by a method such as spraying fine powder. The depth of the fine irregularities is preferably about 2 to 200 microns.

The semitransparent black thin layer in the present invention is a transparent film dyed with a black dye, a film coated or printed on a film having a good light transmittance using a black pigment, or at the time of film production. It is obtained by kneading the pigment in a transparent resin.

It is important that the semi-transparent black thin layer is not a dark black layer or a thick layer that absorbs too much light so that the light reaching the reflecting surface is not consumed. A sufficient contrast cannot be obtained with the thickness of. Although it depends on the capability of the projector and the degree of external light, it is generally effective to use a blackened one so that the light transmittance is about 55 to 80%. The thin layer may have a thickness of about 5 to 50 μm.

The light-reflecting layer may be anything as long as it reflects light entirely, but a film, sheet or plate having a metal vapor-deposited or metal-plated surface, for example, aluminum vapor-deposited polyethylene terephthalate or a metal having a mirror surface. A foil or a metal plate such as an aluminum foil, a stainless steel foil, a chrome-plated plate or the like is preferable. It is also possible to use a white film on the side of the deposition surface opposite to the incident light to prevent the transmission of light.

The reinforcing layer is used by being combined and integrated in order to obtain the required strength of the screen for practical use, but it is a metal plate, a metal foil, a plastic film, a plastic sheet, a plastic plate, a glass plate, a wooden plate, a glass woven cloth, A glass non-woven fabric, a foamed sheet, a synthetic paper, a cloth, or a combination thereof is preferable. It is also possible to form the light-reflecting layer directly on the surface of the reinforcing layer.

The composite integration of each of these layers can be carried out by an appropriate known method, but an adhesive method, a thermocompression method, etc. are particularly preferable. The fine irregularities on the surface of the light diffusion layer may be performed after the layers are combined and integrated.

FIG. 1 is a schematic sectional view of the present invention, in which 1 is a light diffusion layer, 2 is a semi-transparent black thin layer, 3 is a light reflection layer, and 4 is a reinforcing layer.

[0013]

[Action]

 In the screen of the present invention, similarly to a general screen of this type, an image is formed on the light diffusion layer 1 by the projection light and the reflected projection light from the light ray reflection layer 3, and the viewer sees this image. Since the light diffusing layer diffuses light by the fine irregularities on the surface and the light diffusing agent contained in this layer, it has the effect of widening the viewing angle and eliminates the glare of the screen.

In particular, in the screen of the present invention, in addition to the above-mentioned effects, the light transmitted through the surface of the first light diffusion layer 1 or the light diffusion layer 1 without being reflected by the diffusing agent is reflected by the light reflection layer. Until then, it is partially absorbed by the second black thin layer 2, further reflected by the third light ray reflecting layer 3, absorbed by the second black thin layer 2, and the remaining light returns to the light diffusion layer 1. Form an image. In this case, most of the external light, which is weaker than the projected light, is absorbed by the second black thin layer 2, so that it is reflected by the light ray reflecting layer 3 and hardly returns to the light diffusing layer 1, and the first light diffusing layer The image due to the projected light on the layer 1 will be emphasized.

[0015]

【effect】

 As described in detail above, the reflective screen of the present invention has a light diffusing layer having fine irregularities on the image surface, a semi-transparent black thin layer, and a light-reflecting surface, and thus is very clear and Images with good contrast can be provided.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a reflective screen of the present invention.

[Explanation of symbols]

 1 layer of diffusing agent 2 translucent black thin layer 3 light reflecting layer 4 film

Claims (1)

[Scope of utility model registration request] 1. A reflective screen comprising a light diffusing layer having fine irregularities on a projection surface, a semi-transparent black thin layer, a light reflecting layer and a reinforcing layer, which are sequentially stacked.