JP3485318B1 - Transparent screen that can be seen through - Google Patents

Abstract

An object of the present invention is to provide a transmissive screen capable of projecting an image projected from a projector or the like with a wide viewing angle, and further allowing a viewer to see behind the screen. SOLUTION: It is made of a woven fabric, a knitted fabric or a fibrous structure in which the monofilament fibers are arranged vertically and horizontally, which are composed of light transmitting monofilament fibers and have a porosity between fibers of 10 to 70%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive screen used for a screen for a projector,
In particular, the present invention relates to a rear projection type transmissive screen that allows a user to visually recognize an image projected from a projector from the side opposite to the screen with the screen interposed therebetween.

[0002]

2. Description of the Related Art Conventionally, a transmission type screen uses a polarizing film, a Fresnel lens or a lenticular lens as a light scattering layer, a fine particle substance, a fiber woven fabric or a fiber molded product. Things are known. For example, a transmission screen using titanium oxide-coated mica (JP-A-11-44915) and a transmission screen having spherical beads (JP-A-2000-171905) have been proposed as those using a fine particle substance. A transmission screen having a structure in which plate-shaped fibers are laminated with a light-transmissive material having a refractive index lower than that of the fibers using a fiber woven fabric or a fiber molded product (JP-A-6-282010), There has been proposed a transmissive screen (Japanese Patent Laid-Open No. 6-273851) in which a light-transmissive material is filled between the fibers of a permeable fiber woven fabric to form an uneven surface between the fibers. It is extremely difficult for these transmissive screens to see through the back of the screen and look through the other side of the screen.

[0003] As may be transparent with improved perspective of the transmission type screen, for example, JP 2001 -2425
46, there is proposed a transmissive screen using a light-scattering phase containing specific spherical fine particles, which is transparent.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a see-through transmissive screen capable of displaying an image projected from a projector or the like with a wide viewing angle and visually recognizing the back of the screen. It is intended.

[0005]

Means for Solving the Problems As a result of intensive investigations by the present inventors on a see-through transmissive screen that does not use particulate matter, etc., a mesh cloth made of monofilament fiber having light transmissivity was used. The inventors have found that the screen can be seen through and can display a clear image, and have completed the present invention.

That is, the present invention provides (1) a liquid crystal polymer
The inner layer is the inner layer and the transparent resin is the outer layer.
That light transmitting monofilament fibers consists of fiber void ratio is at 10% to 70%, of the wavelength 380nm~700nm Yes
The light transmittance of visible light is 70% or more, and the light reflectance is
Relates to a see-through transmission screen, which is made of a woven fabric having a content of 20% or less .

(2) The light transmissive monofilament fiber
Has a diameter of 20 to 500 μm.
(1) The present invention relates to a see-through transmissive screen.

(3) The light transmissive monofilament fiber
It consists of sandwiching a woven fabric composed of
The transparent see-through according to the above (1) or (2)
Regarding oversized screens.

[0009]

[0010]

(4) The light transmissive resin is polyester,
At least one selected from iron, polypropylene , polyethylene, vinylidene chloride, vinyl chloride, polyether naphthalate, and polyphenylene sulfide, according to any one of (1) to (3) above . Transparent screen that can be seen through.

(5) The light transmissive material is an acrylic resin plate or sheet, a polyolefin resin plate or sheet,
At least one kind selected from a polycarbonate resin plate or sheet and a polyester resin plate or sheet, and described in any one of (1) to (4) above.
The present invention relates to a see-through transmissive screen.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The see-through transmissive screen of the present invention comprises a liquid crystal polymer as an inner layer and a light transmissive resin as an outer layer.
Is a transmissive screen composed of a woven fabric made of a light-transmissive monofilament fiber having a two-layer structure .

Since the transmissive screen of the present invention is a see-through screen through which the object behind the screen can be seen through, the product is introduced and explained by projecting it on the screen by a liquid crystal projector or the like at a trade show or an exhibition site. Etc., and at the same time, it is possible to appeal to the audience the products etc. displayed behind the screen. Further, a show window of a store is used for displaying products by introducing products and the like, and by disposing the see-through transparent screen according to the present invention in the show window, it is possible to introduce and explain products. Advertisements or decorations can be projected from behind the screen to introduce products to consumers, and the consumers can see the products themselves. In addition, in a restaurant or the like, a see-through transmissive screen according to the present invention is installed so that the outside scenery can be seen from the inside of the store, and at the same time, the advertisement of the store or the like can be produced by projecting an explanation of the advertisement or the landscape or decoration. Can be done.

Regarding the see-through transmissive screen of the present invention (hereinafter sometimes simply referred to as "screen"),
A detailed description will be given with reference to the drawings.

FIG. 1 is an enlarged schematic view of a woven fabric (mesh cloth) composed of light-transmissive monofilament fibers, which is one of the embodiments of the screen in the present invention. FIG. 2 is a schematic view showing a monofilament fiber having a two-layer structure used in the present invention, and (b) is a sectional view taken along line AA of (a). FIG. 3 is a schematic diagram showing a light diffusion state of a monofilament. FIG. 4 is a schematic diagram showing a light diffusing state in a screen in which a screen made of a fiber structure such as a woven or knitted fabric of the present invention is sandwiched between light transmissive materials. In each figure, 1 is a monofilament fiber, 2 is a space between fibers, 3 is a light transmissive resin, 4 is a liquid crystal polymer, and 5 is a light transmissive material.

The screen of the present invention is composed of a woven or knitted fabric of light-transmitting monofilament fibers or a fiber structure in which the monofilament fibers are arranged in length and width. The area ratio occupies 10% to 70%. In the screen of the present invention, the back of the screen can be seen through the voids between the fibers. Further, as shown in the schematic view of FIG. 3, the screen of the present invention utilizes a circular cross section of a monofilament and a light diffusing action caused by bending of a fiber structure such as a woven fabric or a knitted fabric, and has a wide viewing angle. You can get a video.

Therefore, this porosity is related to the transparency and resolution of the screen. From the viewpoint of transparency, the higher the porosity, the better, and from the viewpoint of the resolution, the lower the porosity. When the transparency is important, the porosity is 40% to 70%.
And the porosity is 10 when the resolution is important.
% To 50% is preferable. In the case of a woven fabric, this porosity is determined by a combination of the weave density and the yarn diameter. The weave density of the mesh cloth is preferably 25 threads / inch / inch to 508 pieces / inch, more preferably 100 pieces / inch to 508 pieces / inch, respectively.

The monofilament used in the present invention preferably has a diameter of 20 μm to 500 μm, and more preferably 20 μm to 100 μm.
In addition, the light transmittance of the screen is visible light (wavelength 380 nm
To 700 nm), 70% or more, and further 8
It is more preferably 0% or more. The higher the light transmittance, the clearer the image can be obtained. Also, a lower light reflectance can provide a clearer image. In the present invention, the reflectance is 2
It is preferably 0% or less, and more preferably 15% or less.

Examples of the light transmitting monofilament fiber in the present invention include those selected from polyester, nylon, polypropylene, polyethylene, vinylidene chloride and vinyl chloride. Further, a light-transmissive monofilament fiber having a two-layer structure in which the inner layer is a liquid crystal polymer and the outer layer is a light-transmissive resin is used. In the present invention, a superior image can be obtained by using a monofilament fiber having a two-layer structure. It is speculated that this is because the light diffusion effect is increased due to the difference between the refractive index of the liquid crystal polymer of the inner layer and the refractive index of the light transmissive resin of the outer layer.

The light-transmissive resin forming the outer layer of the monofilament fiber having the two-layer structure is, for example, polyester.
At least one selected from steal, nylon, polypropylene , polyethylene, vinylidene chloride, vinyl chloride, polyether naphthalate, and polyphenylene sulfide is included.

Further, the see-through transmissive screen of the present invention is a light-transmissive resin plate or sheet, which is a screen made of a woven fabric, a knitted fabric or a fiber structure in which the monofilament fibers are arranged in length and width. A screen having a structure sandwiched between light-transmissive materials such as

FIG. 4 is a schematic diagram showing the diffusion state of projection light in an embodiment in which a screen composed of a woven fabric, a knitted fabric, or a fiber structure in which the monofilament fibers are vertically and horizontally arranged is sandwiched by a light-transmitting material. . As shown in FIG. 4, the projection light has an increased light diffusion effect due to the difference in refractive index between the light transmissive material 5 such as an acrylic resin plate and the screen. This embodiment is stronger than the embodiment in which the woven fabric, the knitted fabric, or the fiber structure in which the monofilament fibers are arranged in the lengthwise and crosswise directions are not sandwiched with the light transmitting material, and the surface of the screen is not directly exposed to the outside. Therefore, it also has an effect of preventing scratches on the screen surface.

As the light transmissive material, an acrylic resin plate or sheet, a polyolefin resin plate or sheet,
A polycarbonate resin plate or sheet, or a polyester resin plate or sheet having excellent transparency can be used. Depending on the intended use of the screen, a film of the above resin can be used as the light transmissive material.

[0025]

EXAMPLES Examples of the screen of the present invention will be given.
Embodiments of the present invention will be specifically described. The present invention is not limited to this embodiment.

[0026]

Example 2 A mesh-like woven fabric having 250 filaments / inch and a porosity of 50%, which has a two-layer structure in which a liquid crystal polymer having a filament diameter of 30 μm is used as an inner layer and a light-transmissive resin is used as an outer layer, is prepared and The transparent screen was formed by sandwiching the transparent acrylic resin plate having a thickness of 5 mm. When the light transmittance and the reflectance of this screen were measured, the light transmittance was 7
The reflectance was 8% to 91% and the reflectance was 11% to 12%. Images were projected onto the screen from behind with a liquid crystal projector, and the viewing angle of the images and the transparency behind the screen were confirmed to be good.

Example 3 A mesh-like woven fabric having 250 filaments / inch and a porosity of 50%, which has a two-layer structure in which a liquid crystal polymer having a filament diameter of 30 μm is used as an inner layer and a light-transmitting resin is used as an outer layer, is prepared. As a transmissive screen, it was hung from the ceiling like a curtain, and an image was projected on the screen from behind by a liquid crystal projector. A transparent screen without a support made it possible to obtain an image as if it were floating in the air. Moreover, by moving the curtain-shaped screen by wind or the like, a still image or a moving image could be obtained.

In the above examples, the light transmittance and reflectance were measured with a model U-3310 spectrophotometer manufactured by Hitachi Ltd.

[0030]

(1) Since the transmissive screen of the present invention is a see-through screen capable of seeing what is behind the screen, it can be projected on the screen by a liquid crystal projector or the like at a trade show or an exhibition site. You can introduce and explain products, and at the same time show the products displayed behind the screen to the audience.

(2) Further, a show window of a store is used for displaying merchandise by displaying merchandise. By arranging the see-through transparent screen according to the present invention in this show window, the merchandise is displayed. It is possible to introduce advertisements such as introductions and explanations, or to display decorations from behind the screen to introduce products to consumers, and also to show products themselves to consumers.

(3) In a restaurant or the like, the transparent screen according to the present invention is installed to see the outside scenery from the inside of the restaurant, and at the same time, the advertisement or the explanation of the scenery or the decoration is projected. Can be used to produce advertisements.

[Brief description of drawings]

FIG. 1 is a schematic view of a woven fabric (mesh cloth) composed of light-transmitting monofilament fibers, which is one of the embodiments of the screen in the present invention.

FIG. 2 is a schematic view showing a monofilament fiber having a two-layer structure used in the present invention. (B) is A-A of (a)
Sectional view.

FIG. 3 is a schematic diagram showing a light diffusion state of a monofilament.

FIG. 4 is a schematic diagram showing a light diffusing state in a screen in which a screen made of a fiber structure such as a woven or knitted fabric of the present invention is sandwiched between light transmissive materials.

[Explanation of symbols]

1 ... Monofilament fiber 2 ... Gap between fibers 3 ... Light transmitting resin 4 ... Liquid crystal polymer 5 ... Light transmissive material

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 64-76041 (JP, A) JP-A 6-27534 (JP, A) JP-A 3-73904 (JP, A) JP-A 2- 77735 (JP, A) Actual development Sho 59-123850 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 21/62 D01F 8/04 D03D 9/00

Claims (5)

(57) [Claims] 1. A liquid crystal polymer as an inner layer and a light-transmitting resin as an outer layer.
It is composed of a light-transmissive monofilament fiber having a two-layer structure with a layer- to-fiber porosity of 10 to 70% and a wavelength of 38.
The light transmittance in visible light of 0 nm to 700 nm is 70.
% Or more and a light reflectance of 20% or less.
See-through transmission screen, characterized in that that. 2. The light-transmissive monofilament fiber has a diameter
Is 20 to 500 μm.
A transparent screen that can be seen through. 3. The light transmissive monofilament fiber
Characterized in that the woven fabric is sandwiched between light-transmissive materials.
The see-through transparent screen according to claim 1 or 2.
N. 4. The light-transmissive resin is polyester or Nairo.
, Polypropylene , polyethylene, vinylidene chloride,
The see-through transmissive screen according to any one of claims 1 to 3, which is at least one selected from vinyl chloride, polyether naphthalate, and polyphenylene sulfide. 5. The light-transmissive material claims, characterized in that at least one selected acrylic resin plate or sheet, a polyolefin resin plate or sheet, a polycarbonate resin plate or sheet and a polyester resin plate or sheet Item 5. A transparent screen capable of see-through according to any one of Items 1 to 4 .