WO2008004575A1 - Feuille optique, écran et appareil d'affichage - Google Patents

Feuille optique, écran et appareil d'affichage Download PDF

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Publication number
WO2008004575A1
WO2008004575A1 PCT/JP2007/063361 JP2007063361W WO2008004575A1 WO 2008004575 A1 WO2008004575 A1 WO 2008004575A1 JP 2007063361 W JP2007063361 W JP 2007063361W WO 2008004575 A1 WO2008004575 A1 WO 2008004575A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
optical sheet
resin
resin layer
styrene
Prior art date
Application number
PCT/JP2007/063361
Other languages
English (en)
Japanese (ja)
Inventor
Michiyuki Nanba
Ryuuichi Iwakawa
Original Assignee
Kuraray Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kuraray Co., Ltd. filed Critical Kuraray Co., Ltd.
Priority to JP2008523707A priority Critical patent/JPWO2008004575A1/ja
Publication of WO2008004575A1 publication Critical patent/WO2008004575A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens
    • G03B21/625—Lenticular translucent screens
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to an optical sheet, a display screen, and a display device.
  • a rear projection display device uses a projection lens and uses a cathode ray tube (CRT; Cathode).
  • CRT cathode ray tube
  • This rear projection screen generally has a Fresnel lens sheet and a lenticular lens sheet.
  • the Fresnel lens sheet narrows the image light so as to fall within a certain angle range, and the lenticular lens sheet widens the image light transmitted through the Fresnel lens sheet to an appropriate angle range.
  • the rear projection screen may be provided with a diffusion front plate that protects the front surface of the screen and diffuses the emitted light.
  • MS ⁇ which is a copolymer of methyl metatalylate and styrene is used as a resin material used for such an optical sheet, a diffusion front plate, or a light diffusion sheet for a backlight for a liquid crystal display device.
  • MS resin is a thermoplastic material that can be easily molded by extrusion at an appropriate temperature, and is frequently used because of its excellent transparency and appropriate refractive index. Since MS resin has hardness, it is resistant to handling during manufacturing, assembly, etc., and scratches, etc. At the same time, it has moderate toughness, so it does not crack or crack when handled.
  • the thickness of 1 to 2 mm can maintain rigidity enough to be self-supporting as a screen. Furthermore, since there is little heat-resistant deterioration, when using extrusion molding, the resin degradation product which does not easily deteriorate by melting is difficult to mix in the molded product. In addition, it has excellent long-term stability and environmental stability, so there is no environmental warpage stability due to moisture absorption, and there is no coloring or deterioration due to ultraviolet rays. Since the requirements required for such optical sheet materials can be obtained, MS resin is frequently used for optical sheets and the like.
  • an active energy ray-cured resin such as urethane acrylate (Photo-Polymer; hereinafter referred to as 2P resin) may be laminated on the MS resin to form an optical sheet.
  • a 2P resin may be used to form a lens part, which is then laminated on an MS resin to produce a Fresnel lens sheet.
  • 2P resin may be used as a transparent adhesive when adhering optical sheets together, for example, by bonding a lenticular lens sheet and a front plate.
  • a functional layer such as a 2P resin resin or a coat may be laminated on the MS resin to form an optical sheet.
  • the demand for environmental stability on the screen has become stricter.
  • methyl methacrylate / styrene copolymer In order to suppress the deformation of the screen accompanying changes in humidity, it is preferred to use methyl methacrylate / styrene copolymer.
  • a resin having a high styrene ratio hereinafter, the styrene ratio means wt%) and a low moisture absorption rate is required.
  • Fresnel lens sheet MD lenticular lens sheet thickness has been reduced from about 2mm to about lmm. This saves the substrate material.
  • the warp fluctuation due to the moisture absorption change becomes larger due to the humidity change of the environment.
  • the adhesion between the Fresnel lens sheet and the lenticular lens sheet cannot be maintained, and the projected image may be blurred due to floating, or the screen surface may move back and forth, causing distortion or deformation of the projected image. To do.
  • Patent Document 1 Japanese Patent Laid-Open No. 10-307201
  • the present invention has been made in view of such a problem, and even if a resin sheet in which 2P resin is laminated is used, it is possible to suppress warpage due to a change in humidity of the sheet and ensure adhesion.
  • An object is to provide an optical sheet, a display screen, and a display device.
  • the optical sheet according to the present invention is mainly composed of a first resin layer composed of a copolymer of styrene and acrylonitrile having a styrene ratio (weight ratio) of 40% to 90%, and the first cocoon And a second resin layer which is laminated on the surface of the oil layer and is composed of an active energy ray-curable resin layer.
  • the first resin layer is composed of a copolymer force of styrene and acrylonitrile having a saturated water absorption rate of less than 0.6 wt% at 23 ° C and immersed in water.
  • the layer thickness is
  • the second resin layer constitutes a lens array.
  • the display screen according to the present invention includes such an optical sheet.
  • the display screen according to the present invention is a rear projection screen.
  • a display device includes such a display screen.
  • a rear projection type screen and a rear projection type display device can be provided.
  • FIG. 1 is a schematic perspective view showing one structural example of an optical sheet according to the present invention.
  • FIG. 2A is a graph for explaining the relationship between the moisture absorption rate and the warp change of the optical sheet according to the present invention.
  • FIG. 2B is a graph illustrating the relationship between the moisture absorption rate and the change in warpage of the optical sheet according to the present invention.
  • FIG. 2C is a graph for explaining the relationship between the moisture absorption rate and the warp change of the optical sheet according to the present invention.
  • FIG. 3A is a graph illustrating the relationship between the moisture absorption rate and the thickness of the optical sheet according to the present invention.
  • FIG. 3B is a graph illustrating the relationship between the moisture absorption rate and the thickness of the optical sheet according to the present invention.
  • FIG. 4 is a schematic cross-sectional view showing one structural example of a rear projection screen according to the present invention.
  • FIG. 5A is a schematic perspective view showing one structural example of a warpage environment test in an example.
  • FIG. 5B is a schematic perspective view showing one structural example of a warpage environment test in an example.
  • FIG. 6A is a graph showing the results of a warpage environment test in Examples.
  • FIG. 6B is a graph showing the results of a warpage environment test in Examples.
  • FIG. 1 is a schematic cross-sectional view showing one structural example of an optical sheet according to the present invention.
  • an optical sheet 10 according to the present invention has a first resin layer 11 and a second resin layer 12.
  • the first resin layer 11 is mainly composed of a copolymer force of styrene and acrylonitrile having a styrene ratio (weight ratio) of 40% to 90%.
  • the first resin layer 11 has a copolymer power of styrene and acrylonitrile having a saturated water absorption rate of less than 0.6 wt% at 23 ° C. and water immersion.
  • the first resin layer 11 is a sheet-like material that serves as a base material for the optical sheet 10. It is a member.
  • the second resin layer 12 is composed of an active energy ray curable resin layer (2P resin) such as an ultraviolet curable resin laminated on the surface of the sheet-like first resin layer 11. Yes.
  • the second resin layer 12 constitutes a lens array that performs an optical function in the optical sheet 10.
  • the function of the second resin layer 12 may be different from that of the lens depending on the use of the optical sheet 10 to be produced. Examples thereof include a hard coat layer and an adhesive layer with other sheets.
  • the acrylonitrile resin constituting the first resin layer 11 is likely to be in close contact with the 2P resin constituting the second resin layer 12. This is thought to be due to the strong interaction between the acrylonitrile-based resin and the 2P resin, which is more polar than methyl methacrylate.
  • the dissolution parameter (SP value) is PS force 1, PMMA 7.8, polyacrylonitrile (P AN ) Is 15.4, and PAN is highly polar.
  • the styrene ratio can be made higher than that of a conventionally used methyl methacrylate and styrene copolymer resin (MS resin). Accordingly, the hygroscopicity can be reduced, and deformation of the sheet due to moisture absorption can be suppressed.
  • MS resin methyl methacrylate and styrene copolymer resin
  • FIGS. 2A to 2C show the moisture absorption rate of the optical sheet 10 according to the present invention.
  • 2A to 2C show moisture absorption rates when the optical sheet 10 absorbs moisture from one surface on the second resin layer 12 side.
  • the moisture absorption rate of the optical sheet 10 increases to a certain time and then becomes saturated.
  • FIGS. 2B and 2C when moisture is absorbed from one surface of the optical sheet 10, a gradient occurs in the thickness direction in the sheet until the entire sheet reaches the saturated moisture absorption rate.
  • the gradient of the moisture absorption amount in the thickness direction is reduced, so that the warpage change of the optical sheet 10 can be reduced.
  • FIGS. 3A and 3B are graphs showing the moisture absorption rate of the optical sheet 10 as appropriate.
  • the styrene ratio in the constituent material of the first resin layer 11 is particularly preferably 60% or more and 80% or less. This is because the moisture absorption is higher when the styrene ratio is lower than 60%. This is because if the styrene ratio is higher than 80%, problems may arise in the adhesion of the 2P resin.
  • the moisture absorption rate of the optical sheet 10 is preferably 0.7% or less, and more preferably, the deflection temperature under load (IS075) is 80 to 95 ° C from the viewpoint of moldability of the substrate.
  • the adhesiveness of the resin layers 11 and 12 can be improved by heating the base sheet constituted by the first resin layer 11.
  • the substrate sheet can be heated at 40 ° C.
  • the thickness of the base sheet composed of the first resin layer 11 is 0.5 mn! ⁇ 5. Omm is preferred. This is because if the thickness of the base sheet is less than 0.5 mm, the optical sheet 10 is insufficiently rigid, resulting in problems in handling. When the thickness of the base sheet is greater than 5. Omm, the warpage change is small even if the moisture absorption rate is large, and the effects of the present invention may not be sufficiently exhibited. This is because, as shown in FIGS. 3A and 3B, when the sheet is thick, the gradient of moisture absorption in the thickness direction is reduced, and the rigidity of the entire sheet is increased.
  • the difference between the left and right sides is smaller when the thickness of the base sheet is thicker. This is because the thicker substrate sheet has the largest left-right difference, and the time until the amount of change in warpage is maximized.
  • the thickness is thick, the rigidity of the entire sheet increases, so the maximum value of the change is small.
  • the thickness of the base sheet 11 composed of the first resin layer 11 is preferably in the range of 0.7 mm to 4. Omm, particularly in the range of lmm to 3 mm.
  • optical sheet as described above can be applied to the screen member.
  • a description will be given using a rear projection screen.
  • FIG. 4 A schematic perspective view of FIG. 4 shows an example of the configuration of a rear projection screen according to the present invention.
  • the rear projection screen 30 includes a Fresnel lens sheet 31, a lenticular lens sheet 32, and a front plate 33.
  • the Fresnel lens sheet 31, the lenticular lens sheet 32, and the front plate 33 are sequentially arranged from the image light projection side to the image light emission side.
  • each of these members is a rear projection screen 30.
  • the rear force is also arranged in order in the front direction.
  • the Fresnel lens sheet 31 is an optical sheet in which a Fresnel lens 312 is provided on a base material 311.
  • the Fresnel lens 312 has a sawtooth shape with a sharp tip, and is disposed on one surface of the base material 311 of the Fresnel lens sheet 31. Also, the Fresnel lens 312 is uneven on the image light output side.
  • the optical sheet 10 according to the present invention is preferably applied to the Fresnel lens sheet 31 and is composed of the second resin layer 12 on the base material sheet composed of the first resin layer 11. A Fresnel lens 312 is formed.
  • the lenticular lens sheet 32 is an optical sheet in which a lenticular lens 322 is provided on a base material 321.
  • the lenticular lens 322 has a convex shape with a C-shaped cross section, and is disposed on one side of the base material 321 of the lenticular lens sheet 32. Further, the lenticular lens 322 is convex and concave on the image light projection side. Therefore, the lenticular lens 322 of the lenticular lens sheet 32 faces the Fresnel lens 312 of the Fresnel lens sheet 31! In other words, the two lens sheets 31, 32, and the lenses 312, 322 are superposed with each other facing each other.
  • the light shielding pattern 323 that blocks light is arranged in parallel on a flat surface opposite to the lens surface of the lenticular lens 322, and is formed in a non-condensing region where image light does not pass.
  • Various functional layers may be formed on the front surface of the lenticular mirror lens sheet 32.
  • the optical sheet 10 according to the present invention is not limited to the Fresnel lens sheet 31 but can be applied to the lenticular lens sheet 32.
  • the front plate 33 is a member that protects the front surface of the screen, and can diffuse light by mixing, for example, a light diffusing material.
  • the copolymer strength of styrene and acrylonitrile having a styrene ratio (weight ratio) of 40% or more and 90% or less is also different from that of the first resin layer 11.
  • a second resin layer 12 is formed from the 2-resin resin.
  • the screen 30 is composed of two or more optical sheets stacked together! Cover with tape.
  • the optical sheet on the most observation side absorbs moisture only from the observation side
  • the optical sheet on the most light source side absorbs moisture only from the light source side. Therefore, until the entire optical sheet reaches the saturated moisture absorption rate, a gradient occurs in the moisture absorption amount in the thickness direction in the optical sheet, and the warpage changes in the direction in which a gap is generated between the optical sheets.
  • a resin having a high styrene ratio is yellowed by ultraviolet rays, and this tendency is more prominent particularly in the case of talli-tolyl resin.
  • the influence of the yellowing of the urethane acrylate resin is less affected by the yellowing of the acrylonitrile resin. Is bigger. Therefore, even when acrylonitrile-based resin with a high styrene ratio is used as an optical sheet having a lens portion made of urethane-atrelate-based UV-cured resin, the influence of yellowing can be ignored. .
  • thermoplastic general-purpose transparent resin that retains the required performance, is low in cost and has low cost, and can reduce moisture absorption. For this reason, it is possible to prevent the warpage fluctuation from deteriorating even if the substrate sheet is thin, without deteriorating the image performance due to the moisture absorption warpage fluctuation. Therefore, it is to realize a rear projection type screen with lower cost.
  • a first resin layer 11 is formed using a copolymer (AS) resin of acrylonitrile and styrene, and a base sheet having a thickness of 1.35 mm is formed by extrusion molding. Manufactured. At this time, the styrene ratio was 75%, and the water absorption was 0.5%.
  • AS copolymer
  • a second resin layer 12 was produced using 2P resin containing an initiator, and a Fresnel lens sheet having a lens thickness of 0.15 mm was formed.
  • the base sheet before molding was kept at 23 ° C., an uncured resin was applied, left for 2.5 minutes, and then irradiated with UV light to produce a second resin layer 12.
  • FIGS. 5A and 5B An example of the configuration of the warpage environment test is shown in the schematic diagrams of FIGS. 5A and 5B.
  • the lens surface side of the Fresnel lens sheet 31 was covered with an aluminum foil 41, one side was hung with a hanger 42, and the amount of warpage of the sheet was measured and evaluated.
  • the environmental test conditions were changed from Kawasaki to 60 ° C 90% R H X 35 hr, 60 ° C 40% RH X 4 hr, -30 ° C X 3 hr, 20 ° C 50% RH X 60 hr.
  • the long side was Omm and the short side was 7mm.
  • the tape (“cloth adhesive tape No. 750” manufactured by Nitto Denko Packaging System Co., Ltd.) was adhered to the lens surface and then peeled off. Judgment was represented by the number of squares that did not peel out of 100 squares, 1007100 when not peeled, and 0 to 100 when peeled completely.
  • the optical sheet 10 of the present invention has high 2P resin adhesion with little warpage change due to environmental change.
  • the present invention can be used for, for example, an optical sheet, a display screen, or a display device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une feuille optique qui, même lorsqu'une résine à durcissement par ultraviolets est employée, supprime le gauchissement de la feuille ; et un écran et un appareil d'affichage applicables. La feuille optique est une feuille optique (10) comprenant une première couche de résine (11) composée principalement d'un copolymère de styrène/acrylonitrile d'une proportion de styrène de 40 à 90 % (rapport pondéral) et, superposée sur la surface de la première couche de résine (11), une seconde couche de résine (12) produite à partir d'une couche de résine à durcissement par rayonnement à énergie actinique. L'écran d'affichage est doté de la feuille optique ci-dessus. L'appareil d'affichage est doté de l'écran d'affichage.
PCT/JP2007/063361 2006-07-07 2007-07-04 Feuille optique, écran et appareil d'affichage WO2008004575A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008523707A JPWO2008004575A1 (ja) 2006-07-07 2007-07-04 光学シート、表示スクリーン及び表示装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006188223 2006-07-07
JP2006-188223 2006-07-07

Publications (1)

Publication Number Publication Date
WO2008004575A1 true WO2008004575A1 (fr) 2008-01-10

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PCT/JP2007/063361 WO2008004575A1 (fr) 2006-07-07 2007-07-04 Feuille optique, écran et appareil d'affichage

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63167301A (ja) * 1986-12-27 1988-07-11 Asahi Chem Ind Co Ltd 透過型スクリ−ン
JPH06134772A (ja) * 1992-10-23 1994-05-17 Hitachi Ltd 光学部品
JP2003215716A (ja) * 2002-01-24 2003-07-30 Dainippon Printing Co Ltd フレネルレンズシート、透過型投影スクリーン、および透過型投影ディスプレイ
JP2005300967A (ja) * 2004-04-13 2005-10-27 Mitsubishi Gas Chem Co Inc 背面投射型スクリーン

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63167301A (ja) * 1986-12-27 1988-07-11 Asahi Chem Ind Co Ltd 透過型スクリ−ン
JPH06134772A (ja) * 1992-10-23 1994-05-17 Hitachi Ltd 光学部品
JP2003215716A (ja) * 2002-01-24 2003-07-30 Dainippon Printing Co Ltd フレネルレンズシート、透過型投影スクリーン、および透過型投影ディスプレイ
JP2005300967A (ja) * 2004-04-13 2005-10-27 Mitsubishi Gas Chem Co Inc 背面投射型スクリーン

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