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WO2006030710A1 - Ecran de type reflechissant - Google Patents

Ecran de type reflechissant Download PDF

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Publication number
WO2006030710A1
WO2006030710A1 PCT/JP2005/016634 JP2005016634W WO2006030710A1 WO 2006030710 A1 WO2006030710 A1 WO 2006030710A1 JP 2005016634 W JP2005016634 W JP 2005016634W WO 2006030710 A1 WO2006030710 A1 WO 2006030710A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
layer
reflective
light diffusing
refractive index
Prior art date
Application number
PCT/JP2005/016634
Other languages
English (en)
Japanese (ja)
Inventor
Hideki Etori
Masahiro Goto
Original Assignee
Kimoto 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 Kimoto Co., Ltd. filed Critical Kimoto Co., Ltd.
Priority to JP2006535844A priority Critical patent/JPWO2006030710A1/ja
Publication of WO2006030710A1 publication Critical patent/WO2006030710A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention relates to a reflective screen for a projector that reflects an image projected by a projector and displays the image on a screen, and more particularly to a reflective screen capable of projecting a high-contrast image even under projection in a bright environment. Regarding the screen.
  • a two-layer reflective screen having a reflective layer for reflecting the light of the projector and a light diffusion layer for diffusing the reflected light It has been known.
  • a reflective layer having a substantially constant reflectivity regardless of the wavelength with respect to visible light such as an aluminum vapor deposition layer or an aluminum paste coating layer, is used as the reflective layer.
  • a reflective screen capable of projecting a high-contrast image even in a bright environment
  • a reflective layer for selectively reflecting light of a specific wavelength on a light-absorbing substrate A light diffusion layer in which reflected light is diffused has been proposed (Patent Document 1).
  • Such a reflective screen selectively reflects only the three primary colors of light constituting the projector image, that is, red (R), green (G), and blue (B) wavelength region light by the reflective layer 2.
  • R red
  • G green
  • B blue
  • the reflection layer reflects the light in a specular manner, so that the reflected light must be diffused in order to obtain a glare-free image with a wide viewing angle. Therefore, a light diffusion layer is required on the exit surface side (same as the entrance surface) of the reflective layer.
  • Patent Document 1 also discloses a layer structure having a light diffusion layer on the outermost layer of a reflective screen.
  • the image light projected by the projector first enters the light diffusion layer, then is reflected by the reflection layer, is diffused by the light diffusion layer again, and is emitted.
  • the diffused light diffused in the light diffusion layer is light that enters the light diffusion layer and exits from the surface opposite to the incident surface (this is referred to as forward diffused light).
  • forward diffused light There is also a considerable amount of light that is diffused on the incident surface or inside the light diffusion layer and emitted from the incident surface side force (this is referred to as back diffused light).
  • back diffused light when the diffusibility of the light diffusion layer is high, the emission of backward diffused light becomes more prominent. Therefore, when the reflective layer is arranged on the surface opposite to the incident surface, the diffused light emitted from the incident surface contains a lot of backward diffused light in addition to the diffused light that is selectively reflected by the reflective layer. become.
  • the reflective screen of the present invention has reflectivity with respect to light in the blue, green, and red wavelength regions, and the average reflectance of each light in the wavelength region is the wavelength within the visible wavelength region. It has a reflection layer higher than the average reflectance of light outside the region, and the haze force in JIS K7105: 1981 is 0% or more on the incident surface side of the reflective screen.
  • the light diffusing member has at least a light diffusing layer
  • the light diffusing layer includes a transparent spherical fine particle and a transparent binder having a refractive index different from that of the spherical fine particle.
  • the spherical fine particles have an average particle diameter of 1 ⁇ to 10 / ⁇ m, and a value obtained by dividing the refractive index of the spherical fine particles by the refractive index of the transparent binder is 0.91 or more and 1.09 or less. (Except 1.00).
  • the light diffusing member is made of, for example, a resin having a tackiness on the transparent binder of the light diffusing layer.
  • the light diffusing member includes, for example, a base material and a light diffusing layer, and the light diffusing layer is adhered to the reflective layer.
  • the reflective layer is an optical multilayer film in which films made of transparent polymer resin and films made of transparent polymer resin having a different refractive index are alternately laminated. It is characterized by.
  • Each film constituting the optical multilayer film has an optical film thickness D defined by the product of the refractive index and the film thickness, and the relationship between the wavelength of light in the blue, green, and red wavelength region and the following equation: Shall satisfy
  • k is 0 or an integer of 1 or more
  • a light absorption layer for absorbing light transmitted through the reflection layer is provided on a surface opposite to the surface having the light diffusing member of the reflection layer.
  • a reflective screen capable of projecting a high-contrast image, in particular, a higher-contrast image without increasing the brightness of the dark display portion of the projector image. Can be obtained.
  • the reflective screen of the present invention includes a base material 1, a reflective layer 2 formed on the base material 1, and a light diffusing member 3, as shown in FIG.
  • the reflective layer 2 is reflective to light in the blue, green, and red wavelength regions, and the average reflectance of each light in the wavelength region is the average of light in the visible wavelength region other than the wavelength region. It has a reflective layer that is higher than the reflectance, and the light diffusing member 3 is disposed on the incident surface side of the reflective screen 6, and the haze in JIS K7105: 1981 is 60% or more, JIS K7361 -1: Total light transmittance power in 1997 is 70% or more, and Y of tristimulus value in reflection method of JIS Z8722: 2000 is 10 or less.
  • blue (B), green (G), and red (R) are the three primary colors of light that make up the projector image, and are approximately blue ( ⁇ : 420 ⁇ ! ⁇ 480nm), green (G: 52 Onm ⁇ 580nm) , Light in the red (R: 590 nm to 650 nm) wavelength region.
  • the reflection layer is reflective to the three primary colors of light constituting the projected image, that is, the light in the three primary wavelengths of B, G, and R, and the average reflectance of the light in the wavelength range is The average reflectance of light outside the wavelength region in the visible wavelength region is higher.
  • the reflective layer in the reflective screen of the present invention, most of the primary color wavelength region light constituting the projector image is reflected, whereas in the case of ambient light, a wide wavelength is reflected. Since light is distributed in the region, most of it is transmitted through the reflective layer and hardly reflected. Therefore, in the present invention, the image light with the power of the projector is reduced. The reflection of ambient light can be relatively reduced without shifting. As a result, it is possible to obtain a clear image with high contrast even when the projection environment is bright because the decrease in contrast of the image projected on the reflective screen is suppressed.
  • the reflection layer as described above is a bandpass filter that selectively reflects the B, G, and R wavelength regions.
  • a bandpass filter that selectively reflects the B, G, and R wavelength regions.
  • an optical device in which a large number of two types of transparent dielectrics having different refractive indexes are alternately stacked. It consists of a multilayer film.
  • Inorganic substances such as 2 2 may be used in combination, but transparent polymer resin may also be used.
  • a reflective layer can be formed with high productivity by forming an optical multilayer film in which transparent polymer resins having different refractive indexes are alternately laminated.
  • the reflective layer is preferably formed by a multi-layer extrusion method of polymer resin.
  • the polymer resin include polycarbonate (PC), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN).
  • Specific examples of the reflective layer made of a polymer resin include Tijintetron MFL.
  • the reflective screen of the present invention preferably has a light absorbing layer that absorbs light transmitted through the reflective layer on a surface opposite to the surface having the light diffusion layer of the reflective layer.
  • the light absorption layer absorbs the light transmitted through the reflection layer, and thus the reflection of the light transmitted through the reflection layer can be prevented.
  • the light diffusing member is located on the incident surface side of the reflection type screen of the present invention, and the reflection described above It is provided to diffuse the light reflected from the layers to eliminate glare in the image and allow the image to be viewed with a wide viewing angle.
  • the light diffusing member has a haze in JIS K7105: 1981 (hereinafter also simply referred to as haze) force of 0% or more, preferably 70% or more.
  • Total light transmittance in JIS K7361-1: 1997 hereinafter, Is simply 70% or more, preferably 80% or more.
  • the tristimulus value Y (hereinafter also simply referred to as tristimulus value Y) in the JIS Z8722: 2000 reflection method is 10 or less, preferably 8 or less.
  • the projector power can appropriately diffuse the reflected light of the projected image, and the viewing angle can be sufficiently widened.
  • the total light transmittance 70% or more, light incident on the projector can be efficiently transmitted to the reflection layer, so that the image can be projected brighter.
  • the tristimulus value Y is equivalent to the photometric quantity, and if Y is 10 or less, the back diffused light can be reduced. As a result, the back diffused light of the ambient light is reduced, and the dark display portion of the projector image is prevented from being brightened even when projected in a bright environment, and an image with higher contrast can be projected.
  • the light diffusing member having such optical characteristics has at least a light diffusing layer, and only the light diffusing layer may be configured by force, or as shown in FIG.
  • the light diffusion layer 31 may be formed thereon.
  • the light diffusion layer 31 can be composed of, for example, transparent spherical fine particles and a transparent binder having a refractive index different from that of the spherical fine particles.
  • the particle diameter, content, layer thickness, layer surface shape, etc. of the spherical fine particles By adjusting the optical characteristics, the optical characteristics of the above-described light diffusing member can be adjusted.
  • these elements will be described in detail.
  • a liquid that can be transparent and spherical particles can be uniformly dispersed and retained, such as a fluid such as liquid or liquid crystal, or a solid such as glass or polymer resin can be used. From the standpoint of properties and dispersion stability, high molecular weight resin is preferred.
  • the glass used as the transparent binder is not particularly limited as long as the light transmittance of the light diffusion layer is not lost, but in general, silicate glass, phosphate glass, boron Examples include acid glass such as acid salt glass.
  • polyester resin acrylic resin, Acrylic urethane resin, Polyester acrylate resin, Polyurethane acrylate resin, Epoxy acrylate resin, Urethane resin, Epoxy resin, Polycarbonate resin, Cellulose Oil, acetal resin, vinyl resin, polyethylene resin S, polystyrene resin S, polypropylene resin S, polyamide resin S, polyimide resin, melamine resin, vinyl
  • a thermoplastic resin such as a nor-based resin, a silicone-based resin, and a fluorine-based resin, a thermosetting resin, and an ionizing radiation-curable resin can be used.
  • spherical fine particles examples include inorganic fine particles such as silica, alumina, talc, zircoure, zinc oxide, and titanium dioxide, and organic fine particles such as polymethyl methacrylate, polystyrene, polyurethane, benzoguanamine, and silicone resin. Fine particles can be used. In particular, organic fine particles are preferable in that a spherical shape can be easily obtained.
  • the particle diameter of the spherical fine particles is preferably 1 ⁇ m-lO ⁇ m in terms of average particle diameter, and more preferably 2 ⁇ m to 6 ⁇ m.
  • the average particle size is set to 60% or more, and the tristimulus value Y can be set to 10 or less. Therefore, the amount of light that diffuses backward (backward diffused light) can be reduced.
  • the particle size distribution of the spherical fine particles is not particularly limited as long as the average particle size falls within the above range, and may be monodisperse or polydisperse, but may be more backward diffused. From the viewpoint of reducing light, monodispersed ones are preferred.
  • the value obtained by dividing the refractive index of the spherical fine particles by the refractive index of the transparent binder is 0.91 or more and 1.09 or less (except for 1.00). I prefer that.
  • the tristimulus value Y can be reduced to 10 or less while the haze is set to 60% or higher. Further, the back diffused light can be reduced while having diffusibility.
  • the content of the spherical fine particles in the light diffusion layer and the thickness of the light diffusion layer cannot be unconditionally defined by the refractive index of the spherical fine particles and the refractive index of the transparent binder, but the average particle diameter of the spherical fine particles is within the above-mentioned range. (: N! To 10 m), and the value obtained by dividing the refractive index of the spherical fine particles by the refractive index of the transparent binder is in the above range (from 0.91 to 1.09, but 1.0 (Excluding 0), and after adjusting the content and the light diffusion layer thickness, the haze should be 60% or more.
  • the light diffusing member 3 preferably has a substantially smooth surface.
  • substantially smooth means that the arithmetic average roughness (Ra) in JIS B0601: 2001 is 0.30 m or less, preferably 0.15 m or less. By setting this range, the tristimulus value Y can be reduced to 10 or less.
  • Such a light diffusing member 3 can be formed as the light diffusing layer 31 by, for example, applying and drying spherical fine particles together with a polymer resin on the reflecting layer 2 and drying. Yes ( Figure 1). Alternatively, it can be formed by melting a polymer resin and adding a spherical fine particle thereto to form a sheet and sticking it to the reflective layer 2 via the adhesive layer 5 or the like (FIG. 4). In addition, spherical fine particles coated with a polymer resin are applied to a transparent substrate 1 'such as glass or polymer resin similar to the substrate 1 described above, and dried to form a sheet ( It can also be formed by sticking this to the reflective layer 2 via the adhesive layer 5 or the like (FIGS. 5 and 6).
  • the reflective screen 6 of the present invention can be obtained.
  • an antireflection layer may be provided as the uppermost layer. This prevents a reduction in the amount of light of the projected image, and allows a brighter image to be projected on the screen, reduces reflection, and makes the screen more viewable.
  • the tristimulus value Y in the reflection method of JIS Z8722: 2000 is 10 or less, fine irregularities for preventing reflection may be provided on the surface. As a result, it is possible to minimize contrast degradation and reduce the difficulty in viewing the image due to the reflection.
  • the reflective screen of the present invention may be provided with a hard coat layer as the uppermost layer. As a result, it is possible to prevent deterioration in display quality due to scratches on the screen surface. [0045] As described above, the reflective screen of the present invention has reflectivity for light in the blue, green, and red wavelength regions, and the average reflectance of each light in the wavelength regions is visible.
  • JIS K7105 1981 haze of 60% or more
  • JIS K7361— 1 A light diffusive member with a total light transmittance of 70% or more in 1997 and a tristimulus value Y of 10 or less in the reflection method of JIS Z 8722: 2000. Therefore, a high contrast image can be obtained even in a bright environment. In particular, a higher contrast image can be projected without increasing the brightness of the dark display portion of the projector image.
  • a reflective screen of Example 3 was obtained in the same manner as in Example 2 except that the light diffusion layer coating solution of Example 2 was changed to one having the following composition.
  • the haze was 89.1% when the measurement surface was the transparent substrate side
  • the total light transmittance was 97.0%
  • the tristimulus value Y in the reflection method was 5.3. It was.
  • the value obtained by dividing the refractive index of the spherical fine particles by the refractive index of the transparent binder was 0.96.
  • the haze and total light transmittance in the above Examples and Comparative Examples are based on haze IS K7105: 1981, and based on total light transmittance IS K7361-1: 1997, a turbidimeter NDH2000 (Nippon Denshoku Industries Co., Ltd.)
  • a colorimetric color difference meter ZE2000 (Nippon Denshoku Industries Co., Ltd.) based on JIS Z8722: 2000 is used.
  • Measured with The geometric condition for illumination and reception of ZE2000 is condition d. Since the measurement sample has high light transmission, the transmitted light during measurement by the reflection method was not affected by the measurement.
  • the reflective screen of Comparative Example 2 is a reflective layer that exhibits substantially the same reflectance regardless of the wavelength, and the light diffusing member has a haze of 89.6% and a total light transmittance of 94.8.
  • the Y of the tristimulus value by the reflection method was 21.0, it was reflected and diffused even when ambient light was incident on the screen. The contrast was low.
  • FIG. 3 is a cross-sectional view showing an embodiment of the light diffusing member of the reflective screen of the present invention.
  • FIG. 5 is a sectional view showing another embodiment of the reflective screen of the present invention.
  • FIG. 7 is a cross-sectional view showing another embodiment of the reflective screen of the present invention.
  • Reflective layer Light diffusing member Reflective screen First reflective layer Second reflective layer Third reflective layer Light diffusing layer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L’invention concerne un écran de type réfléchissant susceptible d’afficher une image à contraste élevé sous la forme d’une image à contraste élevé sans augmenter spécialement la luminosité autant que pour celle offerte par la partie d’affichage sombre d’une image de projecteur même dans un environnement lumineux. L’écran de type réfléchissant (6) a une couche réfléchissante (2) ayant une réflectivité aux lumières dans des régions de longueurs d’onde bleues, vertes et rouges et ayant des réflectances moyennes respectives de lumières dans les régions de longueurs d’onde ci-dessus qui sont supérieures à celles de lumières dans des régions autres que les régions de longueurs d’onde ci-dessus dans une région de longueurs d’onde visibles. L’écran de type réfléchissant (6) possède sur son côté incident, un élément diffuseur de lumière (3) ayant un voile selon JIS K7105:1981 d’au moins 60%, une transmittance totale de rayons lumineux selon JIS K7361-1:1997 d’au moins 70%, et Y de coordonnées trichromatiques selon le procédé de réflexion JIS Z8722:2000 allant jusqu’à 10.
PCT/JP2005/016634 2004-09-16 2005-09-09 Ecran de type reflechissant WO2006030710A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006535844A JPWO2006030710A1 (ja) 2004-09-16 2005-09-09 反射型スクリーン

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-269691 2004-09-16
JP2004269691 2004-09-16

Publications (1)

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WO2006030710A1 true WO2006030710A1 (fr) 2006-03-23

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WO (1) WO2006030710A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006259575A (ja) * 2005-03-18 2006-09-28 Kimoto & Co Ltd スクリーン
JP2008181046A (ja) * 2007-01-26 2008-08-07 Toppan Printing Co Ltd 反射型スクリーン
KR20220167445A (ko) * 2021-06-11 2022-12-21 주식회사 제이케이테크 고산란 스크린
KR20220167446A (ko) * 2021-06-11 2022-12-21 주식회사 제이케이테크 스크린 겸용 투명 필름

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03150546A (ja) * 1989-10-05 1991-06-26 Thorn Emi Plc 前方映写装置に用いるためのスクリーンおよびプロジェクタ
JP2003337381A (ja) * 2002-03-14 2003-11-28 Sony Corp 投影用スクリーン
JP2004061521A (ja) * 2002-06-07 2004-02-26 Kimoto & Co Ltd 反射型スクリーン

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
EP0627991A1 (fr) * 1992-02-25 1994-12-14 The Dow Chemical Company Film reflecteur de rayons ultraviolets entierement polymere
JP3374978B2 (ja) * 1992-06-29 2003-02-10 大日本印刷株式会社 回折格子の製造方法
JPH11281816A (ja) * 1998-01-28 1999-10-15 Minnesota Mining & Mfg Co <3M> 光フィルター
JP2001350021A (ja) * 2000-06-06 2001-12-21 Sumitomo Chem Co Ltd 薄型光学積層体及びその製造方法
JP2003043459A (ja) * 2001-07-30 2003-02-13 Kyocera Corp 反射板および液晶表示装置
JP2003091003A (ja) * 2001-09-18 2003-03-28 Sharp Corp 液晶表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03150546A (ja) * 1989-10-05 1991-06-26 Thorn Emi Plc 前方映写装置に用いるためのスクリーンおよびプロジェクタ
JP2003337381A (ja) * 2002-03-14 2003-11-28 Sony Corp 投影用スクリーン
JP2004061521A (ja) * 2002-06-07 2004-02-26 Kimoto & Co Ltd 反射型スクリーン

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006259575A (ja) * 2005-03-18 2006-09-28 Kimoto & Co Ltd スクリーン
JP2008181046A (ja) * 2007-01-26 2008-08-07 Toppan Printing Co Ltd 反射型スクリーン
KR20220167445A (ko) * 2021-06-11 2022-12-21 주식회사 제이케이테크 고산란 스크린
KR20220167446A (ko) * 2021-06-11 2022-12-21 주식회사 제이케이테크 스크린 겸용 투명 필름
KR102552545B1 (ko) * 2021-06-11 2023-07-07 주식회사 제이케이테크 고산란 스크린
KR102552546B1 (ko) * 2021-06-11 2023-07-07 주식회사 제이케이테크 스크린 겸용 투명 필름

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