JP3570282B2 - Optical article and rear transmission screen using the optical article - Google Patents

Description

【００６９】
【発明の効果】
本発明によれば、背面透過型スクリーンを構成する光学物品のうちレンチキュラーレンズフィルム光学物品に設けられたストライプ状の遮光層で光線が遮られることによる光量損失が少なく、画面が明るく、シンチレーション現象やシースルー現象が発生しないフレネルレンズシート光学物品とレンチキュラーレンズフィルム光学物品と透光性拡散シート光学物品を組み合わせてなる背面透過型スクリーンを提供することができる。
【図面の簡単な説明】
【図１】従来の背面透過型スクリーンの一例を示す斜視図。
【図２】本発明のフレネルレンズシート光学物品の一例を示す断面図。
【図３】本発明で用いられるレンチキュラーレンズフィルムの構成を説明する断面図。
【図４】本発明の透光性拡散シート光学物品の一例を示す断面図。
（ａ）は、透明樹脂基材に拡散剤のみを混入した透光性拡散シートである。
（ｂ）は、透明樹脂基材に拡散剤と着色剤を混入した透光性拡散シートである。
（ｃ）は、透明樹脂基材に拡散剤のみを混入したシートと透明樹脂基材に着色剤のみを混入したシートとを積層してなる透光性拡散シートである。
【図５】本発明の背面透過型スクリーンの一例を示す断面図。
【符号の説明】
１０…フレネルレンズシート光学物品
２０…レンチキュラーレンズフィルム光学物品
２１…レンチキュラーレンズ部
２２…透明樹脂フィルム
２３…ストライプ状遮光層
３０…フレネルレンズ部
４０…透光性拡散シート
４１、５１…透明樹脂基材
４２、５２…拡散剤
４３、５３…着色剤
５０…透光性拡散シート光学物品
６０…粘着層または接着層
７０…帯電防止、擦傷防止、反射防止層等の付与層
Ｄ…レンズ部の凸部頂点から前記レンズ部の反対側の平坦面までの厚さ
Ｄ′…ストライプ状遮光層の厚さ
Ｐ…シリンドリカルレンズのピッチ
Ｐ′…ストライプ状遮光層の幅
θ…透明樹脂フィルム面に接するストライプ状の遮光層の端部とレンズ部の凸部頂点を通るレンズ中心線とのなす角度
θ′…透明樹脂フィルム面に接しないストライプ状の遮光層の端部とレンズ部の凸部頂点を通るレンズ中心線とのなす角度[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical article such as a Fresnel lens, a lenticular lens, and a diffusion sheet used for a liquid crystal projection television and the like, and a rear transmission screen formed by combining them.
[0002]
[Prior art]
Fresnel lens sheet as an optical component used in the above rear transmission screen is usually a method of hot press molding a transparent thermoplastic resin sheet, or a method of forming a Fresnel lens shape on a thermoplastic resin sheet with an ultraviolet curable resin. Generally done.
In addition, the lenticular lens sheet is manufactured by hot press molding or melt extrusion molding of a transparent thermoplastic resin sheet. The role of the rear transmission screen is to visually recognize the image information from the projector as an image, but in order to form the image information on the screen surface, mixing or diffusion of a diffusing agent into any member constituting the screen. It is common to use plates together. However, it is known that depending on the characteristics of the diffusion plate, the efficiency of the screen may be reduced, and the development of a diffusion plate with a minimum reduction in efficiency is required.
[0003]
2. Description of the Related Art In recent years, liquid crystal projection televisions have become widespread, and transmission-type screens for observing the images have been required.
Since the number of pixels of a liquid crystal projector has been increased with higher definition of image quality, a fine pitch of a lenticular lens or a Fresnel lens is required. More specifically, a fine pitch of 0.3 mm or less, more preferably 0.2 mm or less, is required from around 0.7 mm at present. In addition, as a screen for a liquid crystal projector, it is necessary to provide a stripe-shaped black light-shielding layer serving as an external light absorbing layer corresponding to a fine pitch lenticular lens in order to have a bright field of view and improve contrast. . In addition, in a liquid crystal projector, a scintillation phenomenon in which an image flickers is remarkable, and as a countermeasure for this scintillation, mixing a diffusing material into a Fresnel lens base material has been used as a standard method, but a base material having appropriate diffusion characteristics is used. If no light is used, a part of the light beam is blocked by the light-shielding layer, and a light amount loss occurs. Therefore, it is necessary to reduce the scintillation by making the diffusion characteristics of the Fresnel lens sheet appropriate so as to prevent the loss of light quantity from decreasing. Further, it is necessary for the rear transmission screen to prevent a see-through phenomenon through which a light source passes, and for that purpose, the diffusion characteristics of the lenticular lens substrate need to be adjusted appropriately. Until now, various types of diffusion substrates have been developed using only a Fresnel lens or a lenticular lens alone, but a rear transmission screen combining a fine pitch lenticular lens sheet with a stripe-shaped light-shielding layer and a Fresnel lens. Almost no inventions have been made concerning the diffusion characteristics of the above.
[0004]
[Problems to be solved by the invention]
The present invention has been made to solve the above-mentioned problem, and is composed of a Fresnel lens sheet optical article, a lenticular lens film optical article, and a light-transmitting diffusion sheet optical article, and a stripe provided on the lenticular lens film. It is an object of the present invention to provide a rear transmission screen in which a light amount loss due to a projection light beam being blocked by a light shielding layer is small, a screen is bright, and occurrence of a scintillation phenomenon and a see-through phenomenon is reduced.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is:
In an optical article, a Fresnel lens sheet in which a Fresnel lens shape portion made of a cured product of a radiation-curable resin is formed on a light-transmitting diffusion sheet containing a diffusing agent in a transparent resin substrate, wherein the Fresnel lens sheet is As optical characteristics, haze H
30% <H <60%
And the parallel light transmittance PT,
30% <PT <65%
When the following condition is satisfied and the angle is represented by a bending angle in the vertical direction, 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), 1/20 (δ angle) of the maximum luminance Angle becomes
0.7 ° <α angle <2.0 °,
0.7 ° <β angle <2.0 °,
1.0 ° <γ angle <6.0 °,
2.0 ° <δ angle <6.0 °
It is a Fresnel lens sheet satisfying the following conditions.
[0007]
Claim2The invention described is an optical component, which is a light-transmitting diffusion sheet containing at least a diffusing agent in a transparent resin base material, and has a haze H ′ as an optical property thereof.
75% <H '<85%
And the parallel light transmittance PT ′ is
11% <PT '<25%
The following conditions are satisfied, and angles at which the maximum luminance is 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle) are
3 ゜ <α angle <7 ゜,
5 ° <β angle <9 °,
10 ° <γ angle <16 °,
14 ゜ <δ angle <22 ゜
It is a translucent diffusion sheet satisfying the following conditions.
[0008]
Claim3The described invention relates to a rear transmission screen,A lenticular lens-shaped part in which convex cylindrical lenses made of a cured product of a radiation-curable resin are arranged side by side on a transparent resin film, and a flat surface opposite to the lens surface corresponds to a light condensing part A lenticular lens film provided with a stripe-shaped light-shielding layer in the region of the non-light-condensing portion, wherein the pitch of the convex cylindrical lens is P, from the top of the convex portion of the lens portion to the flat surface on the opposite side of the lens portion. Is D, the width of the striped light-shielding layer provided on the flat surface at a position corresponding to the non-light-collecting portion of each convex cylindrical lens is P ′, and the thickness is D ′. But,
0.05 mm <P <0.3 mm
And the thickness D from the top of the convex portion of the lens portion to the flat surface on the opposite side of the lens portion,
0.05 mm <D <0.3 mm
And the thickness D of the striped light-shielding layer ' But,
D '<10μ m
Satisfies the following conditions and the aperture ratio is
Aperture ratio (%) = (θ ′ / θ) * 100
(Where θ = tan ^-1 {(P−P ′) / 2D}, θ ′ = tan ^-1 {(P−P ′) / 2 (D + D ′)}, where θ is the angle formed between the edge of the stripe-shaped light-shielding layer in contact with the transparent resin film surface and the lens center line passing through the vertex of the convex portion of the lens. The angle between the edge of the stripe-shaped light-shielding layer not in contact with the surface of the transparent resin film and the lens center line passing through the vertex of the convex portion of the lens portion is represented by θ '), and a lenticular lens film optical having an aperture ratio of 90% or more. Goods,
A Fresnel lens sheet optical article according to claim 1,
A light-transmitting diffusion sheet according to claim 2, comprising an optical article,
The Fresnel lens sheet and the lenticular lens sheet obtained by laminating the translucent diffusion sheet on the flat surface of the lenticular lens film are combined so that a Fresnel lens and a lenticular lens are superimposed, and the translucent diffusion sheet is A rear-transmission screen arranged to be an observation surface, wherein the optical characteristics of the screen include a total light transmittance T ″,
50% <T "<85%
Satisfying the following conditions, and angles (ray bending angles) of 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle) of the maximum luminance in the vertical direction. )But,
5 ゜ <α angle <14 ゜
8 ゜ <β angle <16 ゜
15 ° <γ angle <22 °
18 ゜ <δ angle <28 ゜
Satisfies the following conditions.
[0009]
Claim4The invention described in claim 1,2,33. The optical component or the rear transmission screen described in 1., wherein the light-transmitting diffusion sheet contains a diffusing agent containing glass beads having a particle size of 3 to 25 μ as an essential component.
[0010]
Claim5The invention described in the claims2,4In the rear transmission screen described in 1, the layer having at least one or more functions selected from at least antistatic, antiscratch and antireflection functions is formed on the outermost surface on the observation side of the translucent diffusion sheet. It is characterized by the following.
[0011]
<Action>
Generally, as the optical characteristics of the Fresnel lens sheet, when the parallel light transmittance T is low, the haze H is high, and the α, β, γ, and δ angles are wide, the light in the striped light-shielding layer of the lenticular lens sheet is The light loss due to the blockage increases, and the brightness of the screen decreases. Conversely, when the parallel light transmittance T is high, the haze H is low, and the α, β, γ, and δ angles are narrow, the light amount loss due to the light blocking by the stripe-shaped light-shielding layer is reduced. The viewing angle in the vertical direction cannot be sufficiently obtained.
On the other hand, when the parallel light transmittance T of the lenticular lens sheet is high, the haze H is low, and the α, β, γ, and δ angles are narrow, the vertical viewing angle cannot be sufficiently increased. The phenomenon occurs. Conversely, when the parallel light transmittance T is low, the haze H is high, and the α, β, γ, and δ angles are wide, the viewing angle can be increased, but light loss increases and the screen brightness increases. And the resolution of the image is degraded.
When the Fresnel lens sheet optical article and the lenticular lens film optical article of the present invention are combined, the optical properties such as the parallel light transmittance, haze, and diffusion properties of the Fresnel lens sheet and the translucent diffusion sheet optical article are within a predetermined range. By selecting so as to satisfy the above, the light loss due to the blocking of the projected light rays in the stripe-shaped light-shielding layer formed on the lenticular lens film is reduced, the vertical viewing angle is wide, the image brightness and resolution are improved, and scintillation is improved. It is suitably used as a rear transmission screen for a liquid crystal projector in which the occurrence of a phenomenon or a see-through phenomenon is reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an example of a conventional rear transmission screen. The optical article is composed of the Fresnel lens sheet 10 and the lenticular lens sheet 20. A diffusing agent 42 for expanding the vertical viewing angle, a coloring agent 43 for improving the contrast, and the like are usually provided on any of the optical articles. In the case of this example, the diffusing agent 42 and the coloring agent 43 are mixed in the transparent resin base material 41 of the Fresnel lens sheet 10. On the other hand, on the flat surface on the observation surface side of the lenticular lens sheet 20, a stripe-shaped light shielding layer 23 for absorbing external light is formed for the purpose of improving the contrast of the screen.
[0013]
FIG. 2 is a cross-sectional view illustrating an example of the configuration of the Fresnel lens sheet optical article of the present invention.
This is a Fresnel lens sheet optical article 10 in which a Fresnel lens part 30 made of a cured product of a radiation-curable resin is formed on one surface of a light-transmitting diffusion sheet 40 in which a diffusing agent 42 is mixed and dispersed in a transparent resin base material 41.
Examples of the base material 41 used in the present invention include a transparent resin such as a sheet made of a polyester resin, a polystyrene resin, a polyolefin resin, an acrylic resin, a polycarbonate resin, a vinyl chloride resin, or a copolymer of the above resins. . Although not particularly limited, an acrylic resin, an MS resin (a resin obtained by copolymerizing methyl methacrylate and styrene), and a polycarbonate resin are preferable because of their high optical transparency.
[0014]
As the diffusing agent 42 used in the present invention, glass beads are used as an essential component, and inorganic powders containing oxides such as silicon, aluminum and calcium, or polymer beads obtained by cross-linking a resin, if necessary, are used. May be added in a small amount.
These diffusing agents are mixed and kneaded into the transparent resin substrate to form a light-transmitting diffusion sheet. The amount of the diffusing agent is preferably in the range of 5 to 30% by weight.
[0015]
In forming the Fresnel lens part 30 used in the present invention, the radiation-curable resin is composed of urethane (meth) acrylate and / or epoquin (meth) acrylate oligomer, a reaction diluent, a photopolymerization initiator, and a sensitizer. A composition comprising:
[0016]
Examples of the urethane (meth) acrylate oligomer include polyols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, polycaprolactone polyol, polyester polyol, polycarbonate diol, and polytetramethylene glycol, and hexamethylene diisocyanate and isophorone diisocyanate. And organic polyisocyanates such as tolylene diisocyanate and xylene isocyanate. However, it is not particularly limited.
[0017]
Examples of the epoxy (meth) acrylate oligomer include epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolak type epoxy resin, terminal glycidyl ether of bisphenol A type propylene oxide adduct, and fluorene epoxy resin. It can be obtained by reacting with (meth) acrylic acid. However, it is not particularly limited to these.
[0018]
The Fresnel lens part 30 of the present invention is obtained by separately preparing a mold having a shape opposite to that of the Fresnel lens, applying an ultraviolet curable resin on the mold, and laminating and pressing the translucent diffusion sheet 40 on the application surface. By irradiating and curing ultraviolet rays through a light-transmitting diffusion sheet, a Fresnel lens sheet optical component 10 having a Fresnel lens portion 30 made of a cured product of the resin on the sheet is obtained.
[0019]
The method of applying the ultraviolet curable resin is not particularly limited, but a coating method such as a knife coat, a die coat, and a curtain coat is preferable. The coating thickness varies depending on the shape of the Fresnel lens part to be formed, but is suitably 0.1 mm to 0.2 mm. The coating thickness can be adjusted according to the viscosity of the resin and the coating speed.
[0020]
As an optical characteristic of a Fresnel lens sheet optical article in which a Fresnel lens shape portion made of a cured product of a radiation-curable resin is formed on the translucent diffusion sheet obtained above, the haze degree H is 30% <H <60. %, And the parallel light transmittance PT satisfies the condition of 30% <PT <65%, and is 最大 (α angle), 1/3 (β angle), 1/3 of the maximum luminance in the vertical direction. Angles that become / 10 (γ angle) and 1/20 (δ angle) are 0.7 ° <α angle <2.0 °, 0.7 ° <β angle <2.0 °, 1.0 ° < It is characterized by satisfying the following conditions: γ angle <6.0 °, 2.0 ° <δ angle <6.0 °.
[0021]
The above optical characteristics can be realized by controlling the shape of the Fresnel lens, the refractive index difference between the substrate and the diffusing agent, the particle size and distribution of the diffusing agent, and the amount of the diffusing agent added.
[0022]
When a Fresnel lens sheet optical article having a high degree of diffusion is used, the light loss due to the projection light being blocked by the stripe-shaped light-shielding layer provided on the lenticular lens film increases, and the parallel light transmittance T increases. If the haze is as low as 30% or less, the haze H is as high as 60% or more, and the α, β, γ, and δ angles are wide outside the above-specified range, the loss of light quantity due to interruption of the projected light increases. The screen brightness decreases. Conversely, when the parallel light transmittance T is as high as 60% or more, the haze H is as low as 30% or less, and the α, β, γ, and δ angles are narrow outside the above-specified range, the projected light is blocked. However, the viewing angle in the vertical direction cannot be fully utilized.
[0023]
FIG. 3 shows a transparent resin film 22 formed from a cured product of a radiation-curable resin.ToThe thickness D 'and the width P' are formed on the opposite flat surface on which the lenticular lens portion 21 is formed so that the thickness from the vertex of the convex portion of the lens portion having the pitch P to the flat surface on the opposite side of the lens portion is D. The present invention provided with a stripe-shaped light shielding layer 23Used inA lenticular lens film optical article 20. As shown in the figure, the angle between the end of the stripe-shaped light-shielding layer that is in contact with the transparent resin film surface and the lens center line that passes through the convex vertex of the lens portion is θ, and the stripe-shaped light-shielding that is not in contact with the transparent resin film surface The angle between the edge of the layer and the center line of the lens passing through the vertex of the convex portion of the lens portion is represented by θ ′.
[0024]
The present inventionUsed inIn the lenticular lens film optical article, the lenticular lens pitch P satisfies the condition of 0.05 mm <P <0.3 mm, and the thickness D from the vertex of the convex portion of the lens portion to the flat surface on the opposite side of the lens portion is 0. When the condition of 0.05 mm <D <0.3 mm is satisfied, and the thickness of the stripe-shaped light-shielding layer satisfies the condition of D 'and D' <10 μm and the aperture ratio is expressed as follows, 90% It is a lenticular lens film having the above aperture ratio.
Aperture ratio (%) = (θ ′ / θ) * 100
(However, θ = tan^-1{(P−P ′) / 2D}, θ ′ = tan^-1{(P-P ') / 2 (D + D')})
[0025]
If the pitch P is as large as 0.3 mm or more in the lenticular lens film, pixel moiré with the liquid crystal projector is likely to occur, which causes image deterioration. Further, when the thickness D 'of the light-shielding layer is as large as 10 μ or more, the light from the lenticular lens is vignetted, and it is difficult to sufficiently increase the horizontal viewing angle.
[0026]
As the transparent resin film 22 forming the lenticular lens portion used in the present invention, a transparent resin film having ultraviolet transmittance is preferable, and it is desirable that the surface on which the lens portion is formed is subjected to easy adhesion treatment. Examples of the material include polyester, polycarbonate, polyvinyl chloride and the like. From the viewpoint of transparency, strength and flexibility of the film, a polyester film having a thickness of 50 μm to 250 μm and a polycarbonate film having a thickness of 0.1 mm to 0.7 mm are preferred.
[0027]
As the UV-curable resin for forming the lenticular lens portion used in the present invention, the same UV-curable resin as that used for forming the above-described Fresnel lens portion can be used. The application of the ultraviolet-curable resin is not particularly limited, but an application method such as a knife coat, a die coat, and a curtain coat is preferable. The thickness of the coating varies depending on the shape of the lenticular lens to be formed, but is suitably 0.05 mm to 0.1 mm. The coating thickness can be adjusted according to the viscosity of the resin and the coating speed.
[0028]
A method for forming the light shielding layer 23 functioning as a black light absorbing layer will be described in detail.
On the flat surface of the lenticular lens film obtained as described above, an ultraviolet curable resin film having a property of being tacky and having a property of disappearing by the irradiation of ultraviolet rays is laminated. Next, by irradiating ultraviolet rays through the lenticular lens film, using the adhesiveness of the film to the uncured portion of the ultraviolet-curable resin film other than the portion that is condensed and cured by the lens action, using a black powder toner or A transfer sheet having a black colored layer is overlaid on the colored layer side, and the black powder toner or the black colored layer is adhered only to the uncured portion by utilizing the adhesiveness of the resin in the uncured portion, thereby forming a stripe shape. Is formed.
[0029]
Examples of the black powder toner include black pigments, pigments, carbon, metal salts, or black-colored acrylic resins, organic silicone resins, polystyrene resins, urea resins, formaldehyde condensates, and the like, but are not particularly limited. Absent. If necessary, two or more kinds of black powder toners may be used in combination. The transfer sheet having the black colored layer is not particularly limited in terms of the material and the structure of the transfer sheet, and a general-purpose transfer sheet can be used.
The light-shielding layer to be formed is for a non-light-collecting portion by irradiating an actual lenticular sheet with ultraviolet rays. It can be formed with positional accuracy.
Further, according to the above exposure process, the width of the light-shielding layer can be controlled by controlling the width of the adhesive portion according to the amount of exposure.
[0030]
FIG. 4 is a cross-sectional view showing an example of the light-transmitting diffusion sheet optical article of the present invention.
A light-transmitting diffusion sheet 50 in which a transparent resin base material 51 contains at least a diffusing agent 52. If necessary, the light-transmitting diffusion sheet may be appropriately mixed with the coloring agent 53 or may be a two-layer light-transmitting diffusion sheet in which a sheet containing the coloring agent 53 and a sheet containing the diffusing agent 52 are laminated.
[0031]
FIG. 4A shows a light-transmitting diffusion sheet 50 in which only a diffusing agent 52 is mixed into a transparent resin substrate 51. (B) is a light-transmitting diffusion sheet 50 in which a diffusing agent 52 and a coloring agent 53 are mixed into a transparent resin base material 51. (C) is a light-transmitting diffusion sheet 50 in which a sheet in which only a diffusing agent 52 is mixed in a transparent resin base material 51 and a sheet in which only a coloring agent 53 is mixed in the transparent resin base material 51 are laminated.
[0032]
The light-transmitting diffusion sheet of the present invention has, as optical characteristics, a haze H ′ satisfying a condition of 75% <H ′ <85%, and a parallel light transmittance PT ′.
The condition of 11% <PT '<25% is satisfied, and the maximum luminance is 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle). The angles are 3 ° <α angle <7 °, 5 ° <β angle <9 °, 10 ° <γ angle <16 °, 14 ° <δ angle <22 °
Satisfies the following conditions.
[0033]
The above optical characteristics can be realized by controlling the difference in the refractive index between the substrate and the diffusing agent, the particle size and distribution of the diffusing agent, and the amount of the diffusing agent added.
[0034]
The optical characteristics of the light-transmitting diffusion sheet are such that the parallel light transmittance T is as high as 25% or more and the haze H is as low as 75% or less for use in a rear transmission screen. When the β, γ, and δ angles are narrow, the vertical viewing angle cannot be sufficiently increased, and a see-through phenomenon in which the light source of the liquid crystal projector can be seen through occurs. Conversely, when the parallel light transmittance T is as low as 11% or less, the haze H is as high as 85% or more, and the α, β, γ, and δ angles are wide outside the above-described specified range, the viewing angle is increased. However, the loss of light rays increases, the brightness of the screen decreases, and the resolution of the image deteriorates.
[0035]
Examples of the transparent resin substrate 51 used in the present invention include a transparent resin such as a sheet made of a polyester resin, a polystyrene resin, a polyolefin resin, an acrylic resin, a polycarbonate resin, a vinyl chloride resin, or a copolymer of the above resins. Can be. Although not particularly limited, an acrylic resin, an MS resin (a resin obtained by copolymerizing methyl methacrylate and styrene), and a polycarbonate resin are preferable because of their high optical transparency.
[0036]
As the diffusing agent 42 used in the present invention, glass beads are used as an essential component, and inorganic powders containing oxides such as silicon, aluminum and calcium, or polymer beads obtained by cross-linking a resin, if necessary, are used. May be added in a small amount.
These diffusing agents are mixed and kneaded into the transparent resin substrate to form a light-transmitting diffusion sheet. The amount of the diffusing agent is preferably in the range of 5 to 30% by weight.
[0037]
The coloring agent used in the present invention, the light absorption spectrum is substantially uniform in the visible wavelength region, by containing any one of a black visible light absorbing material, or a visible light absorbing material having a selected wavelength characteristic, The amount of light absorption in the visible light wavelength region can be increased, and the contrast of external light can be improved. Colorants capable of absorbing visible light include dyes, pigments, carbon, metal salts, metal oxides, and the like.
[0038]
FIG. 5 is a cross-sectional view of a back-transmission screen including the Fresnel lens sheet optical article 10 of the present invention, a lenticular lens film optical article 20, and a light-transmitting diffusion sheet optical article 50. The lenticular lens of the lenticular lens sheet and the Fresnel lens of the lenticular lens sheet obtained by laminating the translucent diffusion sheet on the flat surface on the opposite side of the lens portion of the Fresnel lens and the lenticular lens film are combined so as to overlap, and FIG. 3 is a cross-sectional view showing an example of the configuration of the rear transmission screen of the present invention disposed so as to be the outermost surface of the observation surface.
Further, if necessary, a small amount of a coloring agent such as a dye, a pigment, carbon, a metal salt, or a metal oxide is added to the lenticular lens portion of the lenticular lens film optical article 20 as a coloring agent as a material capable of absorbing visible light. You can also.
[0039]
As the optical characteristics of the rear transmission screen including the Fresnel lens sheet optical article of the present invention, the lenticular lens film optical article, and the light-transmitting diffusion sheet optical article, the total light transmittance T ″ is 50% <T ″. <85% is satisfied, and angles (に な る angle, 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle) of the maximum luminance in the vertical direction ( Ray bending angle) is 5 ° <α angle <14 °, 8 ° <β angle <16 °, 15 ° <γ angle <22 °, 18 ° <δ angle <28 °
Satisfies the following conditions.
[0040]
The optical properties of the above-mentioned rear transmission screen are as follows: when the optical properties of the Fresnel lens sheet optical article, the lenticular lens film optical article, and the translucent diffusion sheet optical article of the present invention satisfy the above-mentioned predetermined range, Are inevitably obtained by the combination of
[0041]
As the pressure-sensitive adhesive layer for laminating the lenticular lens film 20 and the light-transmitting diffusion sheet 30, an acrylic-based or ethylene-vinyl acetate-based pressure-sensitive adhesive is used, but the material and the configuration are not particularly limited. General-purpose adhesives can be used. It is also possible to use an ultraviolet curable adhesive instead of the adhesive.
[0042]
A layer having at least one or more functions selected from at least scratch prevention, antistatic and antireflection functions is formed on the outermost surface on the observation side of the translucent diffusion sheet.
[0043]
The hard coat layer formed by the hard coat treatment for the purpose of preventing abrasion is formed from an ultraviolet curable paint.
UV-curable coatings are generally composed mainly of polymers, oligomers, monomers, etc. having a radical polymerizable double bond or epoxy group in the structure as a film-forming component, and other photopolymerization initiation. Contains sensitizers and sensitizers.
Preferred in the present invention are surface hardness, transparency, abrasion resistance, abrasion resistance, etc. by using a polyfunctional (meth) acrylate-based UV-curable paint in which the film-forming component has an acrylate-based functional group. It is possible to form an excellent hard coat layer.
[0044]
In the antistatic treatment, an antistatic agent is applied to the base material of the protective resin plate. As an example, tin oxide (SnO) having a particle size of 0.5 μm or less is used.₂) And the surface resistance is 10¹⁰An antistatic layer having a resistance of Ω or less is provided. Surface resistance of antistatic layer is 10¹⁰If it is Ω or less, the metal oxide fine powder is not particularly limited. In particular, the kind, amount, etc. of the antistatic agent are not limited.
[0045]
The anti-reflection treatment can be formed on the protective resin plate by coating or vapor-depositing a thin film made of a material having a lower refractive index than the refractive index of the substrate of the protective resin plate, a transparent fluororesin or a fluoroinorganic compound. . In the present invention, the low refractive material and the forming method are not particularly limited. As a result, it is possible to obtain an image with improved external light contrast and no reflection.
[0046]
【Example】
Hereinafter, examples of the present invention will be described in detail.
[0047]
<Example 1>
As the translucent diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
[Light-transmitting diffusion sheet for Fresnel lens sheet]
Parallel light transmittance PT = 59%
Cloudiness H = 33%
α angle = 0.8 degree
β angle = 0.9 degree
γ angle = 1.4 degrees
δ angle = 2.3 degrees
[Translucent diffusion sheet for lenticular lens film]
Parallel light transmittance PT '= 17%
Haze = 80%
α angle = 4.5 degrees
β angle = 6.6 degrees
γ angle = 12.5 degrees
δ angle = 16 degrees
[0048]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface, and these were laminated to form a rear transmission screen. .
[0049]
<Example 2>
As the translucent diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
"Translucent diffusion sheet for Fresnel lens sheet"
Parallel light transmittance PT = 50%
Cloudiness H = 44%
α angle = 0.8 degree
β angle = 0.9 degree
γ angle = 1.7 degrees
δ angle = 2.8 degrees
"Translucent diffusion sheet for lenticular lens film"
Parallel light transmittance PT '= 17%
Haze = 80%
α angle = 4.5 degrees
β angle = 6.6 degrees
γ angle = 12.5 degrees
δ angle = 16 degrees
[0050]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface, and these were laminated to form a rear transmission screen. .
[0051]
<Example 3>
As the translucent diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
"Translucent diffusion sheet for Fresnel lens sheet"
Parallel light transmittance PT = 39%
Cloudiness H = 56%
α angle = 0.9 degree
β angle = 1.0 degree
γ angle = 2.8 degrees
δ angle = 4.2 degrees
"Translucent diffusion sheet for lenticular lens film"
Parallel light transmittance PT '= 17%
Haze = 80%
α angle = 4.5 degrees
β angle = 6.6 degrees
γ angle = 12.5 degrees
δ angle = 16 degrees
[0052]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface. .
[0053]
<Comparative Example 1>
As the translucent diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
"Translucent diffusion sheet for Fresnel lens sheet"
Parallel light transmittance PT = 64%
Cloudiness H = 28%
α angle = 0.3 degree
β angle = 0.4 degree
γ angle = 0.4 degree
δ angle = 0.4 degree
"Translucent diffusion sheet for lenticular lens film"
Parallel light transmittance PT '= 17%
Haze = 80%
α angle = 4.5 degrees
β angle = 6.6 degrees
γ angle = 12.5 degrees
δ angle = 16 degrees
[0054]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface. .
[0055]
<Comparative Example 2>
As a light-transmitting diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
"Translucent diffusion sheet for Fresnel lens sheet"
Parallel light transmittance PT = 38%
Cloudiness H = 50%
α angle = 0.3 degree
β angle = 0.4 degree
γ angle = 0.4 degree
δ angle = 0.4 degree
"Translucent diffusion sheet for lenticular lens film"
Parallel light transmittance PT '= 17%
Haze = 80%
α angle = 4.5 degrees
β angle = 6.6 degrees
γ angle = 12.5 degrees
δ angle = 16 degrees
[0056]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface, and these were laminated to form a rear transmission screen. .
[0057]
<Comparative Example 3>
As the translucent diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
"Translucent diffusion sheet for Fresnel lens sheet"
Parallel light transmittance PT = 24%
Haze 73 = 73%
α angle = 0.3 degree
β angle = 0.4 degree
γ angle = 0.8 degree
δ angle = 2.0 degrees
"Translucent diffusion sheet for lenticular lens film"
Parallel light transmittance PT '= 17%
Haze = 80%
α angle = 4.5 degrees
β angle = 6.6 degrees
γ angle = 12.5 degrees
δ angle = 16 degrees
[0058]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface, and these were laminated to form a rear transmission screen. .
[0059]
<Comparative Example 4>
As the translucent diffusion sheet used for the Fresnel lens sheet and the lenticular lens film, an MS resin having a thickness of 2 mm was used. The diffusion characteristics of each translucent diffusion sheet are as follows.
"Translucent diffusion sheet for Fresnel lens sheet"
Parallel light transmittance PT = 64%
Cloudiness H = 28%
α angle = 0.3 degree
β angle = 0.4 degree
γ angle = 0.4 degree
δ angle = 0.4 degree
"Translucent diffusion sheet for lenticular lens film"
Parallel light transmittance PT '= 23%
Haze = 73%
α angle = 2.5 degrees
β angle = 4.5 degrees
γ angle = 10 degrees
δ angle = 13.5 degrees
[0060]
The base film used for the lenticular lens film was a lenticular lens shape formed on a polyester resin film having a thickness of 250 μm, and a black stripe was attached to the opposite surface, and these were laminated to form a rear transmission screen. .
[0061]
Performance evaluation of optical characteristics of a back-transmission screen formed by combining the Fresnel lens sheet optical article, the lenticular lens film optical article, and the light-transmitting diffusion sheet optical article prepared in Examples 1 to 3 and Comparative Examples 1 to 4. Was carried out by the following method.
[0062]
<Peak luminance>
A rear projection screen was set on a liquid crystal projection television manufactured by Company A (illuminance at the center of the screen: 160 LUX), and the brightness (cd / m) at a distance of 2 m was set.²) Was measured. The measurement was performed using a BM-7 made by Topcon in a visual field twice.
[0063]
<See-through availability>
A rear-transmissive screen was set on a liquid crystal projection television manufactured by Company A (illuminance at the center of the screen: 160 LUX), and a judgment was made based on the presence or absence of a see-through phenomenon (a phenomenon in which the light source was transparent) at a position 1 m away.
○ → no see-through
× → with see-through
[0064]
<Presence of scintillation>
A rear transmissive screen was set on a liquid crystal projection television manufactured by Company A (illuminance at the center of the screen: 160 LUX), and judgment was made based on the presence or absence of a scintillation phenomenon (a phenomenon of screen glare) at a position 1 m away.
○ → Scintillation is inconspicuous
× → Scintillation is noticeable
[0065]
<Viewing angle>
A light-transmitting diffusion sheet optical article alone, a Fresnel lens sheet optical article, and a rear transmission screen made of a combination of the optical articles are set on a goniophotometer (manufactured by Murakami Color Research Laboratory), and the luminance in the normal direction is 1 / The angles which became 2, 1/3, 1/10, and 1/20 were measured, and were defined as α, β, γ, and δ angles, respectively.
[0066]
<Haze and parallel light transmittance>
Using a turbidity meter (NDH2000: manufactured by Nippon Denshoku Co., Ltd.), the measurement was performed according to JIS K7361 (compensation method).
[0067]
The results of the performance evaluation are shown in Table 1 below.
[0068]
[Table 1]

[0069]
【The invention's effect】
According to the present invention, among the optical articles constituting the rear transmission screen, the lenticular lens film has a small light loss due to light being blocked by the stripe-shaped light-shielding layer provided on the optical article, the screen is bright, the scintillation phenomenon and It is possible to provide a back-transmission screen that is a combination of a Fresnel lens sheet optical article, a lenticular lens film optical article, and a light-transmitting diffusion sheet optical article that does not cause a see-through phenomenon.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a conventional rear transmission screen.
FIG. 2 is a sectional view showing an example of the Fresnel lens sheet optical article of the present invention.
FIG. 3 shows the present invention.Used inFIG. 3 is a cross-sectional view illustrating a configuration of a lenticular lens film.
FIG. 4 is a cross-sectional view showing an example of a light-transmitting diffusion sheet optical article of the present invention.
(A) is a light-transmitting diffusion sheet in which only a diffusing agent is mixed into a transparent resin substrate.
(B) is a light-transmitting diffusion sheet in which a diffusing agent and a coloring agent are mixed in a transparent resin base material.
(C) is a light-transmitting diffusion sheet obtained by laminating a sheet in which only a diffusing agent is mixed in a transparent resin substrate and a sheet in which only a coloring agent is mixed in a transparent resin substrate.
FIG. 5 is a cross-sectional view showing an example of a rear transmission screen of the present invention.
[Explanation of symbols]
10 ... Fresnel lens sheet optical article
20 Lenticular lens film optical article
21 ... Lenticular lens part
22 ... Transparent resin film
23 ... Stripe-shaped light shielding layer
30 ... Fresnel lens part
40 ... Transparent diffusion sheet
41, 51: transparent resin substrate
42, 52 ... diffusing agent
43, 53 ... coloring agent
50 ... Transparent diffusion sheet optical article
60 ... adhesive layer or adhesive layer
70 ... Applied layers such as antistatic, scratch and antireflection layers
D: The thickness from the top of the convex part of the lens part to the flat surface on the opposite side of the lens part
D ': Thickness of the stripe-shaped light shielding layer
P: Pitch of cylindrical lens
P ': width of the stripe-shaped light shielding layer
θ is the angle between the edge of the stripe-shaped light-shielding layer that is in contact with the transparent resin film surface and the lens center line that passes through the convex vertex of the lens.
θ ': Angle between the edge of the stripe-shaped light-shielding layer not in contact with the transparent resin film surface and the lens center line passing through the convex vertex of the lens

Claims (5)

On a light-transmitting diffusion sheet containing a diffusing agent in a transparent resin base material, a Fresnel lens sheet in which a Fresnel lens shape portion made of a cured product of a radiation-curable resin is formed, and as the optical characteristics of the Fresnel lens sheet, Cloudiness H
30% <H <60%
And the parallel light transmittance PT,
30% <PT <65%
The angle satisfying the following condition and being 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle) of the maximum luminance in the vertical direction is
0.7 ° <α angle <2.0 °,
0.7 ° <β angle <2.0 °,
1.0 ° <γ angle <6.0 °,
An optical article which is a Fresnel lens sheet satisfying a condition of 2.0 ° <δ angle <6.0 °. It is a light-transmitting diffusion sheet containing at least a diffusing agent in a transparent resin substrate, and as its optical properties, the degree of haze H ′ is
75% <H '<85%
And the parallel light transmittance PT ′ is
11% <PT '<25%
The following conditions are satisfied, and angles at which the maximum luminance is 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle) are
3 ゜ <α angle <7 ゜,
5 ° <β angle <9 °,
10 ° <γ angle <16 °,
An optical article characterized by being a translucent diffusion sheet satisfying a condition of 14 ° <δ angle <22 °. A lenticular lens-shaped part in which convex cylindrical lenses made of a cured product of a radiation-curable resin are arranged side by side on a transparent resin film, and a flat surface opposite to the lens surface corresponds to a light condensing part A lenticular lens film provided with a stripe-shaped light-shielding layer in the region of the non-light-condensing portion, wherein the pitch of the convex cylindrical lens is P, from the top of the convex portion of the lens portion to the flat surface on the opposite side of the lens portion. Is D, the width of the striped light-shielding layer provided on the flat surface at a position corresponding to the non-light-collecting portion of each convex cylindrical lens is P ′, and the thickness is D ′. But,
0.05 mm <P <0.3 mm
And the thickness D from the top of the convex portion of the lens portion to the flat surface on the opposite side of the lens portion,
0.05 mm <D <0.3 mm
And the thickness D ′ of the stripe-shaped light-shielding layer is
D '<10μ m
Satisfies the following conditions and the aperture ratio is
Aperture ratio (%) = (θ ′ / θ) * 100
(Where θ = tan ⁻¹ {(P−P ′) / 2D}, θ ′ = tan ⁻¹ {( PP ′) / 2 (D + D ′)}, where the transparent resin film surface The angle between the end of the stripe-shaped light-shielding layer contacting the lens and the lens center line passing through the vertex of the convex part of the lens is θ, and the end of the stripe-like light-shielding layer not in contact with the transparent resin film surface and the protrusion of the lens part An angle formed by the lens center line passing through the vertex as θ ′), a lenticular lens film optical article having an aperture ratio of 90% or more;
A Fresnel lens sheet optical article according to claim 1,
A light-transmitting diffusion sheet according to claim 2, comprising an optical article,
The Fresnel lens sheet and the lenticular lens sheet obtained by laminating the translucent diffusion sheet on the flat surface of the lenticular lens film are combined so that a Fresnel lens and a lenticular lens are superimposed, and the translucent diffusion sheet is A rear-transmission screen arranged to be an observation surface, wherein the optical characteristics of the screen include a total light transmittance T ″,
50% <T "<85%
Satisfying the following conditions, and angles (ray bending angles) of 1/2 (α angle), 1/3 (β angle), 1/10 (γ angle), and 1/20 (δ angle) of the maximum luminance in the vertical direction. )But,
A rear transmission screen, which satisfies the following condition: 5 ° <α angle <14 ゜ 8 ° <β angle <16 ゜ 15 ° <γ angle <22 ゜ 18 ° <δ angle <28 °. The translucent diffusing sheet, an optical component or the back transmissive screen according to claim 1, 2, 3, characterized by containing a diffusing agent as an essential main component of glass beads having a particle size 3～25Myu. Wherein the outermost surface of the translucent diffusing sheet on the observation side, claim 2, wherein at least antistatic, abrasion prevention, a layer having at least one or more functions selected from antireflection function is formed, 4. The rear transmission screen according to 4.

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