JP2005024942A - Transmission type screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission type screen which is constituted so that the light source of a projector located behind the screen is not seen through and on which a video from the projector is vividly projected without setting a specified installation condition of the projector. <P>SOLUTION: The transmission type screen is constituted so that the haze (JIS K7136:2000) is ≥80%, total light transmittance (JIS K7361-1:1998) is ≥60%, and the specular glossiness (JIS K5600-4-7:1999) of at least either surface is ≤10%. The screen desirably has a light diffusing layer consisting of a binder component and light diffusing particles at least on either surface of a supporting body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００６８】
表１から明らかなように、すべての実施例の透過型スクリーンは、ヘーズ、全光線透過率、及び鏡面光沢度を所定の値としたため、プロジェクターの光源は透けて見えることなく、また投映された映像は鮮明なものとなった。
【００６９】
特に実施例１、２は光拡散性粒子として無機粒子を用いたため、プロジェクターの光源がまったく透けて見えず、また光拡散性に優れ、投映された映像は鮮明なものとなった。
【００７０】
実施例３の透過型スクリーンは、着色顔料としてカーボンブラックを含有させたため、全光線透過率は８０％未満となり、明るさが若干低下したが映像は鮮明であり、特に黒色などの濃い色の映像は他のものに際立って鮮明なものとなった。
【００７１】
実施例４の透過型スクリーンは、光拡散性粒子として樹脂ビーズを用いて、光拡散性粒子の含有量を比較的多くしたため、鏡面光沢度の低いものとなり、プロジェクターの光源はまったく透けて見えず、また投映された映像は鮮明なものとなった。
【００７２】
実施例５の透過型スクリーンは、光拡散性粒子の含有量を実施例１と同等程度としたが、光拡散性粒子として樹脂ビーズを用いたため、鏡面光沢度が実施例１よりも高いものとなった。このため、実施例５の透過型スクリーンは、プロジェクターの光源は透けて見えないが局部的に明るいものとなった。
【００７３】
実施例６の透過型スクリーンは、光拡散性粒子として樹脂ビーズを用い、実施例５よりもさらに光拡散性粒子の含有量が少ないものとしたため、鏡面光沢度が高いものとなり、プロジェクターの光源は透けて見えないが局部的に明るいものとなった。さらにスクリーンの端の映像は鮮明さが若干低下したが全体としては明るく見やすいものとなった。
【００７４】
比較例１、２の透過型スクリーンは、ヘーズ、および全光線透過率は特定の範囲のものであったため、光拡散性に優れ、投映された映像は鮮明なものとなったが、鏡面光沢度が特定の範囲を超えたため、プロジェクターの光源は透けて見えるものとなった。
【００７５】
また、比較例３の透過型スクリーンは、ヘーズが８０％未満で、鏡面光沢度が１０％を超えるものであったため、プロジェクターの光源は透けて見えるものとなり、光拡散性が低いため映像が鮮明ではないものとなった。また、比較例３の透過型スクリーンは、レンズ効果により映像がボケて見にくいものとなった。
【００７６】
比較例４の透過型スクリーンは、ヘーズ、鏡面光沢度が所定の値のものであったため、プロジェクターの光源がまったく見えず、光拡散性に優れたものであったが、全光線透過率が６０％未満であったため、明るさが低過ぎ、映像は鮮明ではないものとなった。
【００７７】
また、光拡散性フィルムに偏光フィルム、フレネルレンズシート、レンチキュラーレンズシートを組み合わせたものである従来の透過型スクリーン（ＮＷＡ１６００：大日本印刷社）を用いて、上記評価試験を行ったところ、ホットスポットによる縞模様が発生した。
【００７８】
【発明の効果】
本発明によれば、背面にあるプロジェクターの光源が透けて見えることなく、かつプロジェクターからの映像を鮮明に写すことができる透過型スクリーンが得られる。
【図面の簡単な説明】
【図１】本発明の透過型スクリーンの一実施形態を示す断面図。
【図２】本発明の透過型スクリーンの他の実施形態を示す断面図。
【図３】本発明の透過型スクリーンの他の実施形態を示す断面図。
【図４】本発明の透過型スクリーンを用いた一使用例の略図。
【図５】本発明の透過型スクリーンを用いた他の使用例の略図。
【図６】本発明の透過型スクリーンを用いた他の使用例の略図。
【符号の説明】
１・・・・支持体
２・・・・光拡散層
３’・・・光拡散性を有する層
３・・・・透過型スクリーン
４・・・・プロジェクター
５・・・・視認する者[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear projection transmission screen that allows an image projected from a projector to be viewed from the opposite side of the projector across the screen, and more particularly to a transmission screen that does not show through the light source of the projector on the back. .
[0002]
[Prior art]
Conventionally, most of transmissive screens that have been put into practical use are a combination of a light diffusive film, a polarizing film, a Fresnel lens sheet, a lenticular lens sheet, etc., for high brightness and high contrast (patents). Reference 1). However, such transmissive screens are expensive because of the use of polarizing films and lens sheets, and the lens sheets are very fragile, and must be handled with care, or lenticular lens sheets. There is a problem that a hot spot is generated due to the juxtaposition of the lenses, and a moire phenomenon is generated by the lenticular lens sheet and the Fresnel lens sheet. The “hot spot” here refers to a phenomenon in which a stripe pattern is seen in the direction in which the lenses of the lenticular lens sheet are juxtaposed due to the locally high brightness of the central point of the incident light from the projector (Patent Literature). 2).
[0003]
On the other hand, in most projectors used in recent years, the amount of light from the light source itself has increased due to technological advances, and high brightness and high contrast images can be seen even in a bright room.
[0004]
Therefore, the inventors of the present invention focused on a transmission screen that does not use a polarizing film, a Fresnel lens sheet, a lenticular lens sheet, and the like. It was found that the light source could not be used because the light source could be seen through and it would hurt the eyes of the person viewing the screen image in the same way as when looking directly at the light source.
[0005]
Here, it is considered that the light diffusive film should be excessively matted or thickened so that the light source of the projector is not transparent, but if such a transmissive screen is used, the light is projected from the projector. There has been a problem in that the sharpness of the video is significantly reduced and the image is blurred, or the brightness of the entire screen is lowered.
[0006]
In addition, there has been proposed means for making the projector installation conditions specific so that the projector light source cannot be seen (see Patent Document 3). However, depending on the location, installation may not be possible. .
[0007]
[Patent Document 1]
JP-A-6-273852 (Claim 1)
[Patent Document 2]
JP-A-10-268426 (paragraph number 0003)
[Patent Document 3]
JP 2001-242546 A (paragraph number 0031, FIG. 6)
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a transmissive screen that can clearly show an image from a projector without allowing the light source of the projector on the back to be seen through.
[0009]
[Means for Solving the Problems]
The transmission screen of the present invention has a haze (JIS K7136: 2000) of 80% or more, a total light transmittance (JIS K7361-1: 1997) of 60% or more, and a mirror glossiness (JIS) of at least one surface. K5600-4-7: 1999) is 10% or less.
[0010]
Preferably, the support has a light diffusing layer comprising a binder component and light diffusing particles on at least one surface of the support.
[0011]
Preferably, the light diffusing particles include at least an inorganic pigment.
[0012]
The specular gloss (JIS K5600-4-7: 1999) is a value when the CIE standard light source C is used under a geometric condition of 60 °.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The transmission screen of the present invention has a haze of 80% or more, a total light transmittance of 60% or more, and a mirror glossiness of at least one surface of 10% or less.
[0014]
By setting the haze to 80% or more, light is diffused to the edge of the screen, and an image can be uniformly projected to the edge of the screen. More preferably, by setting the haze to 90% or more, the light diffusion performance can be further improved and the video can be easily viewed.
[0015]
Further, by setting the total light transmittance to 60% or more, the light from the projector can be sufficiently transmitted, and the image can be projected brightly and clearly. More preferably, the light transmittance is further improved by setting the total light transmittance to 80% or more, so that the image can be projected more clearly.
[0016]
Further, by setting the mirror glossiness of at least one surface to 10% or less, the light source of the projector on the rear surface can be prevented from being seen through. More preferably, when the specular gloss is 6% or less, the entire image can be made more uniform in brightness. Hereinafter, each component in the transmission screen of the present invention will be described in detail.
[0017]
As for the transmission type screen having such a performance, in addition to a laminate of the support 1 and the light diffusion layer 2 as shown in FIG. 1, a layer 3 ′ having a light diffusion property is a single layer as shown in FIG. In the case of a single layer, in order to set the haze and specular gloss to a predetermined range, a considerable amount of light diffusing particles must be contained in the light diffusing layer 3 ′. Since the physical strength of the layer 3 ′ having light diffusibility tends to decrease, a laminate of the support 1 and the light diffusion layer 2 as shown in FIG. 1 is preferable.
[0018]
The transmission screen of the present invention as shown in FIG. 1 specifically has a light diffusion layer comprising a binder component and light diffusing particles on at least one surface of a support.
[0019]
The support is not particularly limited as long as it has light transmissivity, and a plate or glass film made of glass or plastic can be used.
[0020]
The type of glass is not particularly limited, but in general, oxide glass such as silicate glass, phosphate glass, and borate glass is practical, especially silicate glass and alkali silicate glass. Silicate glass such as soda lime glass, potassium lime glass, lead glass, barium glass, and borosilicate glass is preferred.
[0021]
As the plastic, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyethylene, polyarylate, acrylic, acetylcellulose, polyvinyl chloride, etc. can be used. This is preferable because the mechanical strength is improved.
[0022]
The thickness of such a support can be appropriately selected according to the applied material, but is generally about 10 μm to 30 mm, preferably about 20 μm to 20 mm.
[0023]
In the case of using a support having a light diffusion layer as shown in FIG. 1 as it is as a transmission screen, the thickness of the support is preferably 25 μm or more, more preferably 50 μm, as a lower limit, from the viewpoint of handleability. Desirably, the upper limit is the above range, that is, 30 mm or less, preferably 20 mm or less.
[0024]
In addition, an adhesive layer or the like is provided on the surface of the support opposite to the surface having the light diffusing layer, and is attached to another light-transmitting substrate (for example, the glass or plastic plate described above). When worn and used, the thickness of the support is desirably in the above range, that is, 10 μm or more, preferably 20 μm or more as the lower limit, preferably 200 μm or less, more preferably 130 μm or less as the upper limit. . By setting the thickness of the support to such a value, a transmissive screen that is thin and light and convenient for carrying can be obtained. Such an adhesive layer may be made of a commonly used synthetic resin adhesive such as acrylic, silicone, urethane, or rubber.
[0025]
In addition, the surface of the support may be subjected to an easy adhesion treatment for the purpose of improving the adhesion with a light diffusion layer described later, or may be provided with a separate easy adhesion layer.
[0026]
Next, the light diffusing layer is a layer in which light diffusing particles are uniformly dispersed in a binder component.
[0027]
As the binder component, a polymer resin having good adhesion to the above support is suitably used. Such a polymer resin is not particularly limited, and examples thereof include polyester resins, acrylic resins, acrylic resins. Urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin , Polypropylene resins, polyamide resins, polyimide resins, melamine resins, phenol resins, silicone resins, fluorine resins, and other light-transmitting thermoplastic resins, thermosetting resins, ionizing radiation curable resins Etc. can be used.
[0028]
Light diffusing particles include inorganic pigments such as silica, alumina, talc, zirconia, zinc oxide, titanium oxide, calcium carbonate, barium sulfate, silicone resins, (meth) acrylic resins, styrene resins, benzoguanamine resins. Resin beads such as urethane resins can be used alone or in admixture of two or more. Considering the point that makes the light source of the projector more difficult to see, it is preferable that the difference in refractive index from the binder component is large. Also, when resin beads are used alone, the image projected from the projector is blurred due to the lens effect. Since the light diffusing particles may be difficult to see, the light diffusing particles preferably contain an inorganic pigment. Further, by including an inorganic pigment in the light diffusing particles, the specular gloss can be adjusted to 10% or less even when the content is smaller than when only resin beads are used. Even if the image is blurred, the degree can be reduced. Further, by reducing the content of the light diffusing particles as much as possible, the light diffusing particles and the binder component can be bound to the support, so that the physical strength of the light diffusing layer is increased. Can do.
[0029]
The shape of such light diffusing particles is not particularly limited, and may be any of an indefinite shape, a true spherical shape, a spherical shape, a scale shape, a needle shape, and the like. The size of the light diffusing particles may be appropriately selected depending on the thickness when the light diffusing layer is formed, and is not particularly limited. In general, particles having a size of about 1 μm to 50 μm, preferably about 3 μm to 20 μm are preferably used. The light diffusing particles are preferably selected so that at least a part thereof protrudes from the light diffusing layer. By partially projecting the light diffusing particles from the light diffusion layer, it becomes easy to adjust the specular gloss to 10% or less.
[0030]
The content of the light diffusing particles in the light diffusing layer varies depending on the type of the light diffusing particles and the thickness of the light diffusing layer, so it cannot be generally stated, but with respect to 100 parts by weight of the binder component, the lower limit is 50 parts by weight or more, Preferably it is 80 parts by weight or more, and the upper limit is 300 parts by weight or less, preferably 200 parts by weight or less.
[0031]
By setting the content of the light diffusing particles to 50 parts by weight or more, the haze can be set to 80% or more, and the mirror glossiness can be easily adjusted to 10% or less. Moreover, the total light transmittance can be 60% or more by setting the content of the light diffusing particles to 300 parts by weight or less.
[0032]
The thickness of the light diffusion layer is determined by the size and content of the light diffusing particles, and the haze and specular gloss can be made specific by adjusting the thickness. Therefore, considering the size and content of the above-described light diffusing particles, specifically, the lower limit is 5 μm or more, preferably 10 μm or more, and the upper limit is 50 μm or less, preferably 30 μm or less. By setting the thickness of the light diffusion layer to 5 μm or more, the light diffusing particles and the binder component can be bound to the support while the haze can be 80% or more. In addition, by setting the thickness of the light diffusion layer to 50 μm or less, it is possible to adjust the specular gloss to 10% or less and prevent the total light transmittance from being 60% or less.
[0033]
As long as the above light diffusion layer is within the range not impairing the function of the present invention, a crosslinking agent, photopolymerization initiator, photopolymerization accelerator, lubricant, dye, fluorescent whitening agent, colorant, pigment, antistatic Various additives such as additives, flame retardants, antibacterial agents, antifungal agents, UV absorbers, light stabilizers, heat stabilizers, antioxidants, plasticizers, leveling agents, flow regulators, antifoaming agents, dispersants, etc. May be added.
[0034]
Such a light diffusing layer is used for a light diffusing layer by dispersing or dissolving the binder component, the light diffusing particles, and an additive added as necessary in a solvent on at least one surface of the support. After adjusting the coating solution and applying and drying by a conventionally known coating method such as bar coater, die coater, blade coater, spin coater, roll coater, gravure coater, flow coater, spray, screen printing, etc., if necessary It can be prepared by curing by heating or irradiation with ionizing radiation.
[0035]
As a method for making the haze 80% or more, as described above, it can be easily adjusted depending on the kind and content of the light diffusing particles contained in the light diffusion layer and the thickness of the light diffusion layer. It is also possible to adjust the layer by sandblasting or chemical etching. Moreover, when a support body is a plastic film, it can also adjust by giving embossing.
[0036]
Next, as a method of setting the specular gloss to 10% or less, the content and size of the light diffusing particles contained in the light diffusion layer and the thickness of the light diffusion layer can be easily adjusted. As in the case of haze, it is also possible to adjust by performing sandblasting, chemical etching, or embossing. It is also possible to adjust by forming a light diffusion layer on a film whose surface shape has been adjusted in advance and transferring it to a support.
[0037]
The light diffusion layer as described above may be provided on at least one surface of the support as shown in FIG. 1, but may be provided on both surfaces as shown in FIG.
[0038]
When the transmissive screen of the present invention is installed so that the light diffusing layer 2 is on the projector 4 side as shown in FIG. 4, the light transmittance is reduced in order to prevent reflection of the light from the projector 4. Can be prevented. Further, when the light diffusion layer 2 is installed on the side opposite to the projector 4 as shown in FIG. 5, reflection of external light such as a fluorescent lamp can be suppressed. Further, since the above two effects can be obtained, it is preferable to have the light diffusion layer 2 on both surfaces as shown in FIG.
[0039]
In the above description, the transmissive screen according to the present invention has been described with respect to the laminate of the support 1 and the light diffusion layer 2. However, the light diffusive layer 3 ′ is a single layer as shown in FIG. There may be.
[0040]
When only the layer having light diffusivity is formed as a single layer as shown in FIG. 2, the same glass or plastic film as described in the above support can be used. It can produce by making it contain plate shape or a film form. Further, by directly applying the sandblasting, chemical etching, and embossing to the support, the haze and specular gloss can be adjusted to a predetermined range without providing a light diffusion layer.
[0041]
As described above, according to the transmission screen of the present invention, the haze is 80% or more, the total light transmittance is 60% or more, and the specular glossiness of at least one surface is 10% or less. Even if the installation conditions are not specified, the light source of the projector on the rear side cannot be seen through, and the image from the projector can be clearly displayed.
[0042]
【Example】
Hereinafter, the present invention will be described in more detail based on examples. In this example, “parts” and “%” are based on weight unless otherwise specified.
[0043]
[Example 1]
After mixing a light diffusing particle dispersion a having the following composition, it was dispersed using a sand mill disperser (Nanomill: Asada Tekko Co., Ltd.) to obtain a light diffusing particle dispersion a.
[0044]
Next, on one surface of a silicate glass plate having a thickness of 3 mm, a light diffusion layer coating solution a having the following formulation was applied with a bar coater and dried, followed by curing at 60 ° C. for 24 hours to obtain a thickness of 20 μm. A light diffusing layer was formed, and the transmission screen of Example 1 was produced.
[0045]
<Prescription of light diffusing particle dispersion a>
・ Silica (average particle size 4 μm) 6.0 parts
(Silysia 730: Fuji Silysia Chemical)
・ Silica (average particle size 16 nm) 2.0 parts
(Aerosil R-972: Nippon Aerosil Co., Ltd.)
・ Acrylic resin (solid content 50%) 9.5 parts
(Acridic A807: Dainippon Ink & Chemicals, Inc.)
・ Methyl ethyl ketone 28.0 parts
・ Toluene 28.0 parts
[0046]
<Prescription of coating liquid a for light diffusion layer>
-Light diffusing particle dispersion a 73.5 parts
・ 1.6 parts of polyisocyanate (solid content 60%)
(Takenate D110N: Mitsui Takeda Chemical Company)
[0047]
[Example 2]
A light diffusion layer is formed on one side of a transparent polyethylene terephthalate film (Lumirror T-60: Toray Industries, Inc.) having a thickness of 100 μm in the same manner as in Example 1, and the coating liquid a for the adhesive layer having the following formulation is formed on the other side. Was used to form a pressure-sensitive adhesive layer having a thickness of 20 μm and adhered to the silicate glass plate of Example 1 to produce a transmission screen of Example 2.
[0048]
<Prescription of coating liquid a for adhesive layer>
・ Acrylic adhesive (solid content 40%) 100.0 parts
(Olivein BPS1109: Toyo Ink Manufacturer)
・ 2.5 parts of polyisocyanate (solid content 38%)
(Olivein BHS8515: Toyo Ink Manufacturer)
・ Ethyl acetate 100.0 parts
[0049]
[Example 3]
A transmissive screen of Example 3 was produced in the same manner as in Example 1 except that the light diffusion layer coating liquid b having the following formulation was used instead of the light diffusion layer coating liquid a of Example 1.
[0050]
<Prescription of coating liquid b for light diffusion layer>
-Light diffusing particle dispersion a 76.5 parts
・ Black pigment
(Mitsubishi Carbon Black HCF # 2300: Mitsubishi Kasei) 0.5 parts
・ 1.6 parts of polyisocyanate (solid content 60%)
(Takenate D110N: Mitsui Takeda Chemical Company)
[0051]
[Example 4]
Instead of the light diffusing particle dispersion a and the light diffusing layer coating liquid a of Example 1, a light diffusing particle dispersion c and a light diffusing layer coating liquid c having the following prescription were used to form a light having a thickness of 15 μm. A transmissive screen of Example 4 was produced in the same manner as in Example 1 except that the diffusion layer was formed.
[0052]
<Prescription of light diffusing particle dispersion c>
・ Styrenic resin beads (average particle size 8 μm) 38.0 parts
(Technopolymer SBX-8: Sekisui Plastics Co., Ltd.)
・ Acrylic resin (solid content 50%) 30.0 parts
(Acridic A807: Dainippon Ink & Chemicals, Inc.)
・ Methyl ethyl ketone 31.0 parts
・ Toluene 31.0 parts
[0053]
<Prescription of coating liquid c for light diffusion layer>
-Light diffusing particle dispersion c 132.0 parts
-Polyisocyanate (solid content 60%) 7.0 parts
(Takenate D110N: Mitsui Takeda Chemical Company)
・ Methyl ethyl ketone 50.0 parts
・ Toluene 50.0 parts
[0054]
[Example 5]
Instead of the light diffusing particle dispersion liquid a and the light diffusion layer coating liquid a of Example 1, a light diffusing particle dispersion liquid d and a light diffusion layer coating liquid d of the following formulation were used, and light having a thickness of 15 μm. A transmissive screen of Example 5 was produced in the same manner as in Example 1 except that the diffusion layer was formed.
[0055]
<Prescription of light diffusing particle dispersion d>
・ Styrene resin beads (average particle size 8μm) 8.5 parts
(Technomer SBX-8: Sekisui Plastics Co., Ltd.)
・ Acrylic resin (solid content 50%) 10.0 parts
(Acridic A807: Dainippon Ink & Chemicals, Inc.)
・ Methyl ethyl ketone 30.0 parts
・ Toluene 30.0 parts
[0056]
<Prescription of coating liquid d for light diffusion layer>
-Light diffusing particle dispersion d 78.5 parts
・ 2.0 parts of polyisocyanate (solid content 60%)
(Takenate D110N: Mitsui Takeda Chemical Company)
[0057]
[Example 6]
Example 6 was performed in the same manner as in Example 1 except that a light diffusion layer having a thickness of 13 μm was formed using the light diffusion layer coating liquid e having the following formulation instead of the light diffusion layer coating liquid a in Example 1. A transmissive screen was prepared.
[0058]
<Prescription of coating liquid e for light diffusion layer>
・ 5.5 parts of acrylic resin beads (average particle size 10 μm)
(MX-1000: Soken Chemical Co., Ltd.)
・ 2.0 parts of silicone resin beads (average particle size 3 μm)
(Tospearl 130: Toshiba Silicone)
・ Acrylic resin (solid content 50%) 17.0 parts
(Acridic A807: Dainippon Ink & Chemicals, Inc.)
・ Polyisocyanate (solid content 60%) 3.0 parts
(Takenate D110N: Mitsui Takeda Chemical Company)
・ Methyl ethyl ketone 20.0 parts
・ Toluene 20.0 parts
[0059]
[Comparative Example 1]
The transmissive screen of Comparative Example 1 was prepared by attaching a transparent adhesive film (Buful Full EP: Kimoto Co.) to the surface of the transmissive screen of Example 1 provided with the light diffusion layer. The transparent adhesive film had an overall thickness of 83 μm, of which the adhesive layer had a thickness of 8 μm.
[0060]
[Comparative Example 2]
A commercially available transmissive screen film with specific projector installation conditions was attached to the silicate glass plate of Example 1 to obtain a transmissive screen of Comparative Example 2.
[0061]
[Comparative Example 3]
An adhesive layer was formed in the same manner as in Example 2 on the surface opposite to the surface having the light diffusing layer of the light diffusion film (Light Up TL4: Kimoto Co.), and then adhered to the silicate glass plate of Example 1. Thus, the transmission screen of Comparative Example 3 was obtained.
[0062]
[Comparative Example 4]
A light diffusing film (MTN-W5: Kimoto Co.) was attached to the silicate glass plate of Example 1 to obtain a transmission screen of Comparative Example 5.
[0063]
About the transmissive screens obtained in Examples and Comparative Examples, the haze is measured based on JIS K7136: 2000, the total light transmittance is measured based on JIS K7361-1: 1997, and the haze meter (NDH2000: Nippon Denso Co., Ltd.). It measured using. Moreover, the specular glossiness was measured using a gloss meter (SM4 / UGV-5K: Suga Test Instruments Co., Ltd.) based on JIS K5600-4-7: 1999. The specular gloss was CIE standard light source C under a geometric condition of 60 °. In the measurement, the surface having the light diffusion layer was used as the light incident surface. The measurement results are shown in Table 1.
[0064]
Next, the transmission type screens obtained in the examples and comparative examples were evaluated for (a) whether the light source could not be seen through, and (b) the sharpness of the image due to light diffusion performance and brightness. First, as shown in FIG. 5, the viewers, the examples, and the transmission screens of the comparative example and the projector (XV-P3: Sharp Corporation) were arranged in this order, and images were projected. The evaluation results are shown in Table 1.
[0065]
(B) “◯” indicates that the light source of the projector was not seen through at all, “△” indicates that the light source was not seen through but was locally bright, and “x” indicates that the light source was seen through.
[0066]
(B) “◎” if the projected image is bright and clear, “○” if the image is slightly low but clear, or if the image at the edge of the screen is slightly sharp but easy to see, “○” The case where the image was not clear due to low diffusibility, or the case where the image was not clear due to low brightness was designated as “x”.
[0067]
[Table 1]

[0068]
As is clear from Table 1, the transmissive screens of all the examples were set to predetermined values for the haze, total light transmittance, and specular gloss, so that the projector light source was not seen through and was projected. The video became clear.
[0069]
In particular, Examples 1 and 2 used inorganic particles as the light diffusing particles, so that the light source of the projector was not seen through at all, and the light diffusibility was excellent, and the projected images became clear.
[0070]
Since the transmission type screen of Example 3 contained carbon black as a coloring pigment, the total light transmittance was less than 80%, the brightness was slightly reduced, but the image was clear, and particularly a dark color image such as black. Became distinct and distinctive.
[0071]
The transmissive screen of Example 4 uses resin beads as the light diffusing particles, and the content of the light diffusing particles is relatively increased, so that the specular gloss is low, and the light source of the projector cannot be seen through at all. Also, the projected image became clear.
[0072]
The transmissive screen of Example 5 has the light diffusing particle content equivalent to that of Example 1. However, since resin beads were used as the light diffusing particles, the specular gloss was higher than that of Example 1. became. For this reason, the transmissive screen of Example 5 was locally bright although the light source of the projector could not be seen through.
[0073]
The transmissive screen of Example 6 uses resin beads as light diffusing particles and has a lower light diffusing particle content than Example 5, so that the mirror gloss is high, and the light source of the projector is Although it could not be seen through, it became bright locally. In addition, the image at the edge of the screen was slightly less sharp but overall bright and easy to see.
[0074]
Since the transmissive screens of Comparative Examples 1 and 2 had a haze and a total light transmittance within a specific range, the light diffusibility was excellent, and the projected image became clear, but the specular glossiness Was beyond a certain range, so the projector's light source could be seen through.
[0075]
Further, since the transmissive screen of Comparative Example 3 had a haze of less than 80% and a specular glossiness of more than 10%, the light source of the projector was seen through, and the image was clear due to low light diffusibility. It was not. In addition, the transmissive screen of Comparative Example 3 was difficult to see due to the lens effect.
[0076]
The transmissive screen of Comparative Example 4 had a predetermined value of haze and specular gloss, so the light source of the projector could not be seen at all and the light diffusibility was excellent, but the total light transmittance was 60. Because it was less than%, the brightness was too low and the image was not clear.
[0077]
Moreover, when the above evaluation test was performed using a conventional transmission screen (NWA1600: Dai Nippon Printing Co., Ltd.), which is a combination of a light diffusing film, a polarizing film, a Fresnel lens sheet, and a lenticular lens sheet, a hot spot was obtained. Due to the striped pattern.
[0078]
【The invention's effect】
According to the present invention, it is possible to obtain a transmissive screen that can clearly show the image from the projector without the light source of the projector on the back surface being seen through.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a transmission screen of the present invention.
FIG. 2 is a cross-sectional view showing another embodiment of the transmission screen of the present invention.
FIG. 3 is a cross-sectional view showing another embodiment of the transmission screen of the present invention.
FIG. 4 is a schematic view of an example of use using the transmission screen of the present invention.
FIG. 5 is a schematic view of another example using the transmission screen of the present invention.
FIG. 6 is a schematic view of another example using the transmission type screen of the present invention.
[Explanation of symbols]
1 .... Support
2. Light diffusion layer
3 '... Light diffusing layer
3 ... Transparent screen
4. Projector
5...

Claims (3)

The haze (JIS K7136: 2000) is 80% or more, the total light transmittance (JIS K7361-1: 1997) is 60% or more, and the mirror glossiness of at least one surface (JIS K5600-4-7: 1999). A transmissive screen characterized in that is 10% or less. The transmissive screen according to claim 1, further comprising a light diffusing layer comprising a binder component and light diffusing particles on at least one surface of the support. The transmissive screen according to claim 2, wherein the light diffusing particles include at least an inorganic pigment.

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