JP2006119489A - Reflective screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflective screen on which an image projected on the screen and a background of the screen are visible from a projector side, and to provide a reflective screen on which the background of the screen is also visible from the opposite side to the projector. <P>SOLUTION: The reflective screen 7 has a reflective layer 5 and a light diffusing layer 2 on one surface of a black film 1, 6, and the screen 7 comprises portions 4 having the light diffusing layer 2 and portions 3 having transparency periodically mixed. The portion 4 having the light diffusing layer 2 has reflecting property, and the light diffusing layer 2 is formed of a light diffusing agent and a transparent binder comprising a curing resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reflective screen for a projector that projects an image projected from a projector onto a screen as reflected light, and more particularly to a reflective screen that allows a projector to visually recognize the image projected on the screen and the background of the screen. .

  Conventionally, in order to project an image projected from a projector onto a screen as reflected light, a reflection type screen has conventionally been provided with a reflective layer for reflecting light from the projector and a light diffusion layer for diffusing the reflected light. Two-layer reflective screens are known. In such a two-layer reflection type screen, the reflection layer is made of an aluminum vapor deposition layer or an aluminum paste coating layer, and the light reflected by the reflection layer is further diffused by the light diffusion layer, so that a relatively wide viewing angle can be obtained. You can see images without glare. However, since such a conventional reflective screen is not transparent, it is almost impossible to visually recognize the background of the screen.

  By the way, display items such as menus, price lists, and posters are sometimes affixed to shop windows and the like for people in the store. Also, such display objects are static and their contents do not change unless reapplied. Therefore, in order to make a dynamic display object, it is conceivable to stick a reflective screen on a show window and project using a projector or the like, but in a show window with such a conventional reflective screen attached, Since the reflective screen is not transparent, it is impossible to see the inside from the inside of the store or the inside from the outside.

  Accordingly, an object of the present invention is to provide a reflective screen from which the image projected on the screen and the background of the screen can be visually recognized from the projector side. It is another object of the present invention to provide a reflective screen that can visually recognize the background of the screen from the opposite side of the projector.

  The reflective screen of the present invention has a light diffusing layer on one surface of a support, and the screen has a part having a light diffusing layer and a part having transparency in a periodic or random mixture. The portion having the light diffusing layer has light reflectivity, and the light diffusing layer is formed of a light diffusing agent and a transparent binder made of glass or a curable resin. Is.

  Preferably, the portion having the light diffusion layer has a screen gain of 0.7 or more.

  Further preferably, the part having transparency has a haze of 40% or less in JIS K7136: 2000 and a total light transmittance in JIS K7361-1: 1997 of 80% or more.

  Preferably, the transparent part is a through hole.

  Preferably, when viewed from the support side, the portion corresponding to the portion having the light diffusion layer is black.

  The screen gain in the present invention is a value obtained by screen gain = (front luminance / illuminance) × π.

  According to the present invention, it is possible to obtain a reflective screen from which the image projected on the screen and the background of the screen can be visually recognized from the projector side. Further, it is possible to obtain a reflective screen that allows the background of the screen to be viewed from the opposite side of the projector.

  The reflective screen of the present invention has a light diffusing layer on one surface of a support, and the screen has a part having a light diffusing layer and a part having transparency in a periodic or random mixture. The portion having the light diffusing layer has light reflectivity, and the light diffusing layer is formed from a light diffusing agent and a transparent binder made of glass or curable resin. Hereinafter, embodiments of each component will be described.

  As the support, metal, glass, polymer resin, or the like can be used. Examples of the polymer resin include thermoplastic resins such as polycarbonate, polyester, polyolefin, polyvinyl chloride, polystyrene, and acrylic. Such a support can be appropriately selected from plate-like, film-like and sheet-like ones according to the application.

  Such a support can project an image from a projector by adjusting the optical characteristics of a light diffusion layer, which will be described later. Therefore, the support may be transparent or opaque, but can display a clearer image. In order to prevent an image from being seen from the support side (the side of the support that does not have the light diffusion layer), it is preferable to use an opaque screen.

  Furthermore, in order to enhance the reflection characteristics of light from the projector and project a clearer image, it is preferable to use a substrate having a surface reflectance of 90% or more. Such a support is made of a metal such as aluminum or silver in the form of a sheet, or on a glass plate or a polymer resin in the form of a sheet. It can be obtained by forming or applying a paste-like metal in a film form. In addition, it is also preferable to use a polymer resin in which a white pigment is kneaded into a sheet or the like in order to suppress the occurrence of hot spots and enhance light diffusibility.

  Next, the light diffusion layer will be described. The light diffusion layer is provided for directly diffusing the light projected from the projector, diffusing the light reflected from the support, and projecting an image on the screen, and is provided directly on the support or a polarizing film. When interposing, it is provided on the polarizing film. In the present invention, the light diffusion layer is formed from at least a light diffusing agent and a transparent binder made of glass or curable resin.

  The glass used as the transparent binder is not particularly limited as long as the light transmission property of the light diffusion layer is not lost. Generally, the glass such as silicate glass, phosphate glass and borate glass is used. Examples include oxide glass.

  Curing resins used as transparent binders include polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, and polycarbonate resins. Resin, Cellulose resin, Acetal resin, Vinyl resin, Polyethylene resin, Polystyrene resin, Polypropylene resin, Polyamide resin, Polyimide resin, Melamine resin, Phenol resin, Silicone resin, Fluorine resin, etc. A thermosetting resin, an ionizing radiation curable resin, or the like can be used.

  By using glass or a curable resin as a transparent binder in this way, unlike the case of using a thermoplastic resin, the heat from the light emitted from the projector or the heat from sunlight when it is attached to a show window or the like. On the other hand, since the deformation or expansion / contraction is small, the flatness of the screen can be maintained. In addition, when a polymer resin is used as the support, it is possible to make the support itself light diffusive by adding a light diffusing agent to the polymer resin or by forming pores in the support. However, in such a screen, as described above, the screen is often deformed or stretched by the heat from the light emitted from the projector or the heat from sunlight when it is attached to a show window. It becomes difficult to maintain flatness.

  Next, as light diffusing agents, silica, alumina, talc, zirconia, zinc oxide, titanium oxide, calcium carbonate, barium sulfate and other inorganic fine particles, silicone resins, (meth) acrylic resins, styrene resins, benzoguanamines Organic fine particles such as resin and urethane resin can be used alone or in admixture of two or more.

  The shape of such a light diffusing agent is not particularly limited, and may be any of an irregular shape, a true spherical shape, a spherical shape, a scale shape, a needle shape, and the like. The size of the light diffusing agent may be appropriately selected depending on the thickness of the light diffusing layer, and is not particularly limited, but those having an average particle diameter of 1 μm to 50 μm, preferably about 3 μm to 20 μm are suitably used. .

  The content of the light diffusing agent in the light diffusing layer varies depending on the presence or absence of the reflective layer, the type and size of the light diffusing agent, and the thickness of the light diffusing layer. The lower limit is 2 parts by weight or more, preferably 25 parts by weight or more, and the upper limit is 300 parts by weight or less, preferably about 200 parts by weight or less. Here, the content of the light diffusing agent in the light diffusing layer in the case of not having a reflective layer is, as a lower limit, 50 parts by weight or more, further 80 parts by weight or more with respect to 100 parts by weight of the transparent binder. preferable. By setting the content of the light diffusing agent in such a range, light can be clearly projected from the projector.

  The thickness of the light diffusing layer is not particularly limited and varies depending on the size and content of the light diffusing agent and cannot be generally stated, but is generally about 2 μm to 50 μm, preferably about 5 μm to 30 μm.

  In the reflective screen of the present invention having such a light diffusing layer, the portion having the light diffusing layer has light reflectivity, so that an image projected from the projector can be projected. As for the optical characteristics of the portion having such a light diffusion layer, the screen gain is preferably 0.7 or more, more preferably 0.8 or more. When the screen gain is 0.7 or more, it is projected from the projector. Can be displayed clearly.

  In such a light diffusion layer, a thermoplastic resin, a cross-linking agent, a photopolymerization initiator, a photopolymerization accelerator, a lubricant, a dye, a fluorescent brightening agent, and coloring are used as long as the effects of the present invention are not impaired. Agent, pigment, antistatic agent, flame retardant, antibacterial agent, antifungal agent, UV absorber, light stabilizer, heat stabilizer, antioxidant, plasticizer, leveling agent, flow regulator, antifoaming agent, dispersant You may add various additives, such as.

  For example, when the transparent binder is a thermosetting resin, the light diffusing layer as described above is a dilute solvent containing the above-described light diffusing agent, thermosetting resin, cross-linking agent, and additives added as necessary. The coating solution for the light diffusing layer is prepared by dispersing or dissolving with a conventional coating method, for example, bar coater, die coater, blade coater, spin coater, roll coater, gravure coater, flow coater, spray, screen printing, etc. It can be obtained by curing by coating and drying, followed by aging.

  For example, when the transparent binder is an ionizing radiation curable resin, the light diffusing layer includes the above-described light diffusing agent, ionizing radiation curable resin, photopolymerization initiator, and additives and dilution solvents added as necessary. A coating solution for the light diffusing layer is prepared by dispersing or dissolving in a coating solution, which is applied by a conventionally known coating method similar to that described above, dried as necessary, and then cured by irradiation with ionizing radiation. .

  As a method of irradiating with ionizing radiation, ultraviolet rays in a wavelength region of 100 nm to 400 nm, preferably 200 nm to 400 nm emitted from an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a metal halide lamp, etc. are irradiated or scanned. The irradiation can be performed by irradiating an electron beam having a wavelength region of 100 nm or less emitted from a type or curtain type electron beam accelerator.

  The reflective screen of the present invention having such a light diffusing layer has a portion having a light diffusing layer and a portion having transparency in a screen plane (screen surface direction) mixed periodically or randomly. Is. As such a reflection type screen 7, for example, the portion 3 having the light diffusion layer is periodically provided in the form of a stripe in the screen surface having the light diffusion layer as the portion 4 having the light diffusion layer, or a circle, an ellipse, Examples thereof include a polygon such as a quadrangle, an irregular shape provided periodically or randomly, or a combination of the shapes described above (FIGS. 4 and 6). Further, for example, contrary to the above, as the portion 3 having transparency, the portion 4 having the light diffusing layer is periodically provided in the form of a transparent sheet or the like in the form of a circle, oval In addition, a polygonal shape such as a quadrangle, an irregular shape, a periodic shape or a random shape, or a combination of the shapes described above may be used (FIGS. 5 and 7).

  The ratio of the area between the portion 4 having the light diffusing layer and the portion 3 having transparency in the reflective screen 7 of the present invention is not particularly limited, but the portion 4 having the light diffusing layer: see-through. It is the part 3 which has property, Preferably it is 4: 1-1: 4, More preferably, it is about 2: 1-1: 2 (FIGS. 4-7).

  Thus, when providing the part which has transparency in the screen surface which has a light-diffusion layer, the part which has the said transparency has a major axis of 0.1 mm-8 mm, Furthermore, 0.2 mm-8 mm, The said transparency It is preferable that the shortest distance between a portion having a thickness and an adjacent transparent portion is 0.1 mm to 5 mm, and further, periodically or randomly formed at intervals of 0.2 mm to 5 mm. When the major axis of the part having transparency is less than 0.1 mm, or when the shortest distance between the part having transparency and the part having transparency that is adjacent exceeds 5 mm, the background of the screen becomes difficult to visually recognize, If the major axis of the part having the property exceeds 8 mm, or the shortest distance between the part having the transparency and the part having the transparency is not less than 0.1 mm, the projected image from the projector is It becomes difficult to see. That is, the portion having transparency in the screen surface having the light diffusing layer is continuously formed with the above-described size and interval, so that the image projected from the projector can be clearly displayed while the screen is projected. You can see the background.

  Moreover, when providing the part which has a light-diffusion layer in the surface, such as a sheet | seat which has transparency, the part which has a light-diffusion layer has a major axis of 0.1 mm-8 mm, Furthermore, 0.2 mm-8 mm, The shortest distance between the portion having the light diffusing layer and the portion having the adjacent light diffusing layer may be periodically or randomly formed at intervals of 0.1 mm to 5 mm, and further 0.2 mm to 5 mm. preferable. If the major axis of the part having the light diffusion layer is less than 0.1 mm, or the shortest distance between the part having the light diffusion layer and the part having the adjacent light diffusion layer exceeds 5 mm, the projected image from the projector The longer diameter of the portion having the light diffusion layer exceeds 8 mm, or the shortest distance between the portion having the light diffusion layer and the portion having the adjacent light diffusion layer is less than 0.1 mm The screen background is difficult to see. In other words, the portion having the light diffusion layer in the surface of a transparent sheet or the like is continuously formed with the above-described size and interval, so that the image projected from the projector is clearly displayed. , You can see the background of the screen.

  Here, the major axis of the part having transparency and the part having the light diffusion layer in the present invention is as follows according to the shape. For example, if the shape is a perfect circle, it is a diameter, if it is an ellipse, it is the major axis, if it is a triangle, it is the longest vertical line, if it is a polygon more than a quadrangle, it is the longest diagonal, Means the longest straight line connecting

  As for the part which has transparency, it is preferable that the haze in JIS K7136: 2000 is 40% or less, and the total light transmittance in JIS K7361-1: 1997 is 80% or more. Since the portion having transparency has such optical characteristics, when the light projected from the projector is incident on the reflective screen of the present invention, the portion having transparency has a background of the screen without projecting an image. It can be visually recognized.

  Moreover, when providing the part which has transparency in the screen surface which has a light-diffusion layer, a part which has transparency may be a through-hole. By making the transparent part a through hole, light projected from the projector and ambient light are not reflected, so that the background of the screen can be more easily seen. Further, the shape of the transparent portion in the screen surface may change in the thickness direction of the screen as long as it does not deviate from the above-described range.

  In the reflective screen of the present invention, it is preferable that the portion corresponding to the portion having the light diffusion layer is black when viewed from the support side. In this way, the portion corresponding to the portion having the light diffusion layer when viewed from the support side is black, so that even if the image is projected from the projector, the image is not visible from the support side. In addition, the background of the screen can be easily seen from the opposite side of the projector as compared with the case of white or other colors. Further, since the ambient light from the support side can be blocked from the side having the light diffusion layer, the image projected from the projector can be projected more clearly.

  As described above, as viewed from the support side, as a method of blackening the portion corresponding to the portion having the light diffusion layer, a black film in which a black pigment such as carbon black is appropriately contained in the support is used, or the support is used. A method of forming a black layer by coating a black paint or the like on one surface or both surfaces of the film. When the support is transparent, it is necessary to form a black layer on one or both surfaces of the support and to provide a reflective layer as described above between the light diffusion layer and the black layer. There is. Similarly, when the support is a black film, it is necessary to provide a reflective layer between the light diffusion layer and the black film. When the support is opaque, a black layer may be provided on the surface of the support opposite to the surface having the light diffusion layer.

  The reflective screen of the present invention as described above is formed by, for example, using a black film as a support, and forming a reflective layer and a light diffusing layer on one surface of the support by the above-described conventional coating method, followed by die cutting. It can be formed by punching out a portion having transparency through the apparatus (FIG. 1).

  Further, for example, a sheet of a polymer resin kneaded with a white pigment is used as a support, and a light diffusion layer is formed on one surface of the support by the above-described conventionally known coating method. After forming a black layer on the surface, it can be formed by punching out a portion having transparency through a die-cutting device (FIG. 2).

  Further, for example, a black layer, a reflective layer, and a light diffusing layer can be obtained by laminating in order so as not to be printed by screen printing or the like on one surface of a transparent support (FIG. 3). .

  Hereinafter, the present invention will be described in more detail based on examples. In this example, “parts” and “%” are based on weight unless otherwise specified.

[Example 1]
On a 100 μm thick black film (Lumirror X30: Toray Industries, Inc.), an aluminum film with a thickness of 100 nm is formed by vapor deposition to form a reflective layer, and a light diffusion layer coating solution having the following formulation is applied onto the reflective layer by a bar coating method. After drying, the film was aged at 60 ° C. for 24 hours to form a 20 μm thick light diffusion layer.

  Next, as a part having transparency, the shortest distance between the part having transparency and an adjacent part having transparency is 1 mm with an ellipse having a major axis of 2 mm using a die-cutting device on the entire surface of the screen. The reflection type screen of Example 1 was obtained. The screen gain of the portion having the light diffusion layer was 1.0.

<Prescription of coating liquid for light diffusion layer of Example 1>
-Thermosetting acrylic resin (solid content 50%) 30 parts (Acridic A807: Dainippon Ink and Chemicals)
-Light diffusing agent (styrene beads, average particle size 6 μm) 8 parts (SBX-6: Sekisui Chemical Co., Ltd.)
・ Light diffusing agent (average particle size 16μm) 16 parts (non-leafing type scaly aluminum paste)
(Solid content 50%) (5501EA: Showa Aluminum Powder)
・ Carbon black 0.4 parts ・ Isocyanate-based crosslinking agent (solid content 60%) 6 parts (Takenate D110N: Mitsui Takeda Chemical)
・ Ethyl acetate 40 parts ・ Butyl acetate 40 parts

[Example 2]
On one surface of a film (W300: Mitsubishi Chemical Polyester) kneaded with a white pigment having a thickness of 100 μm, a black layer coating solution having the following formulation was applied and dried to form a black layer having a thickness of 10 μm. Thereafter, a light diffusion layer was formed on the other surface in the same manner as in Example 1 using the light diffusion layer coating solution of Example 1.

  Next, as a part having transparency, a through hole was provided in the same manner as in Example 1 to obtain a reflective screen of Example 2. The screen gain of the portion having the light diffusion layer was 0.95.

<Prescription of Coating Solution for Black Layer of Example 2>
・ 92 parts of thermosetting acrylic resin (solid content 50%) (Acridic A804: Dainippon Ink & Chemicals, Inc.)
・ 16 parts of carbon black (Vulcan XC-72: Cabot)
・ Isocyanate-based crosslinking agent (solid content 75%) 25 parts (Bernock DN980: Dainippon Ink & Chemicals, Inc.)
・ Methyl ethyl ketone 60 parts ・ Toluene 40 parts

[Example 3]
On a transparent polyester film (Lumirror T60: Toray Industries, Inc.) having a thickness of 100 μm as a support, it was applied by screen printing using the black layer coating liquid of Example 2 and dried to form a black layer. A reflective layer coating solution having the following formulation was applied and dried in the same manner as the black layer to form a reflective layer having a thickness of 25 μm, and then aged at 60 ° C. for 24 hours.

  Further, a light diffusion layer coating solution having the following formulation was applied to the upper layer in the same manner as the black layer, dried, and then irradiated with ultraviolet light with a high pressure mercury lamp to form a light diffusion layer having a thickness of 3.5 μm. A reflective screen was obtained. Screen printing is a perfect circle with a diameter of 1 mm as a part having transparency on the entire surface of the screen, and the shortest distance between the part having transparency and the part having transparency that is adjacent is periodically 1 mm apart. Formed.

  The screen gain of the portion having the light diffusion layer was 0.85. Further, the haze of the transparent part in JIS K7136: 2000 was 1.4%, and the total light transmittance in JIS K7361-1: 1997 was 88%.

<Prescription of Coating Solution for Reflective Layer of Example 3>
Scale-like aluminum pigment (average particle size 15 μm) 4.5 parts Thermosetting acrylic resin (solid content 50%) 9.5 parts (Acridic A807: Dainippon Ink & Chemicals, Inc.)
・ Isocyanate-based crosslinking agent (solid content 60%) 1.6 parts (Takenate D110N: Mitsui Takeda Chemical Company)
・ Methyl ethyl ketone 28 parts ・ Toluene 28 parts

<Prescription of coating solution for light diffusion layer of Example 3>
-Light diffusing agent (methacrylic resin, average particle size 5 μm) 2 parts (MX-500KS: Soken Chemical Co., Ltd.)
・ Ultraviolet curable acrylic resin (solid content 80%) 100 parts (Unidic 17-813: Dainippon Ink & Chemicals, Inc.)
・ Photopolymerization initiator 1 part (Irgacure 651: Ciba Specialty Chemicals)
・ 200 parts of propylene glycol monomethyl ether

[Example 4]
On the same transparent polyester film as in Example 3, a light diffusion layer was formed in the same manner as in Example 1 using the light diffusion layer coating liquid of Example 1 with titanium oxide added instead of carbon black. . Next, as a part having transparency, through holes were provided in the same manner as in Example 1 to obtain a reflective screen of Example 4. Note that the screen gain of the portion having the light diffusion layer was 0.8.

[Comparative Example 1]
The reflective screen of Example 1 in which no through hole was formed was used as the reflective screen of Comparative Example 1.

[Comparative Example 2]
A reflective screen of Comparative Example 2 was produced in the same manner as in Example 4 except that the light diffusion layer coating liquid of Example 4 was changed to the light diffusion layer coating liquid of the following formulation. Note that the screen gain of the portion having the light diffusion layer was 0.8.

<Prescription of coating liquid for light diffusion layer of Comparative Example 2>
・ 15 parts of thermoplastic polyester resin (100% solids) (Byron 30: Toyobo)
-Light diffusing agent (styrene beads, average particle size 6 μm) 8 parts (SBX-6: Sekisui Chemical Co., Ltd.)
・ Light diffusing agent (average particle size 16μm) 16 parts (non-leafing type scaly aluminum paste)
(Solid content 50%) (5501EA: Showa Aluminum Powder)
・ Titanium oxide 0.4 parts ・ Ethyl acetate 40 parts ・ Butyl acetate 40 parts

[Comparative Example 3]
A through-hole is provided in a 100 μm-thick calcium carbonate-containing polypropylene film (YUPO FPG: Oji Oil Chemical Co., Ltd.) as a transparent part in the same manner as in Example 1 to obtain a reflective screen of Comparative Example 3. It was. Note that the screen gain of the portion having the light diffusion layer was 0.9.

  The transparency of the reflective screens obtained in the examples and comparative examples, (1) whether the background of the screen is visible from the projector side, (2) whether the background of the screen is visible from the opposite side of the projector, and ( 3) The flatness was evaluated. The evaluation results are shown in Table 1.

  In the evaluation of the transparency of (1), when the outside of the daytime is bright, the reflective screens of the examples and comparative examples are attached to the show window with adhesive tape, the room is darkened, and the liquid crystal projector (XV-P3: Sharp) The background of the screen from the projector side, that is, what can be seen well from the inside of the room is “◯”, and what cannot be seen from the inside of the room is “X”.

  In the evaluation of the transparency in (2), “○” indicates that the background of the screen from the opposite side of the projector, that is, the room can be clearly seen from the outside, in a state where the image is projected from the projector in the same manner as in (1). If no video is projected from the outside, “△” indicates that the room can be seen from the outside, and “X” indicates that the room cannot be seen from the outside.

  (3) The flatness was evaluated by placing the reflective screens of Examples and Comparative Examples on a flat table at 30 inches, and using a liquid crystal projector (XV-P3: Sharp Corporation) to display a white image from a height of 2M. Projection was performed for 30 minutes, and the case where the state did not change was designated as “◯”, and the case where floating or the like occurred was designated as “X”.

  The reflective screens of Examples 1 to 4 have a light diffusing layer on one surface of the support, and the screen is periodically mixed with a portion having a light diffusing layer and a portion having transparency. The portion having the light diffusing layer has light reflectivity, and the light diffusing layer is formed of a light diffusing agent and a transparent binder made of a curable resin. The interior of the light diffusing layer can be seen well from the inside, and since the curable resin is used for the transparent binder of the light diffusion layer, it has excellent flatness. In addition, since the reflection type screens of Examples 1 to 4 and Comparative Examples 2 and 3 had a screen gain of 0.7 or more in the portion having the light diffusion layer, a large number of portions having transparency were formed in the screen surface. Later, the projected images became clear and easy to see.

  In particular, in the reflective screens of Examples 1 to 3, since the portion corresponding to the portion having the light diffusion layer was black when viewed from the support side, even when the image was projected from the projector, the support side From this point, it is not necessary to view the image, and the background of the screen from the side opposite to the projector, that is, the room can be seen from the outside.

  In the reflection type screen of Example 4, when the image is projected from the projector as viewed from the support side, the image can be viewed from the support side, and the room is difficult to see from the outside. If the image is not projected from the projector, the room can be seen from the outside.

  On the other hand, the reflective screen of Comparative Example 1 was not formed with a see-through portion in the screen surface, so that the room could not be seen from the outside and from the outside.

  In addition, the reflective screens of Comparative Examples 2 and 3 can be viewed from the support side when the image is projected from the projector as seen from the support side, as in Example 4. The room was difficult to see from the outside, but if the image was not projected from the projector, the room could be seen from the outside. However, since the reflective screen of Comparative Example 2 uses a thermoplastic resin as the transparent binder of the light diffusion layer, the reflective screen of Comparative Example 3 uses a calcium carbonate-containing polypropylene film as the support and light diffusion layer. Therefore, the flatness was inferior to that of Example 4.

Sectional drawing which shows one Example of the reflection type screen of this invention. Sectional drawing which shows the other Example of the reflection type screen of this invention. Sectional drawing which shows the other Example of the reflection type screen of this invention. The front view which shows one Example of the reflection type screen of this invention. The front view which shows the other Example of the reflection type screen of this invention. The rear view which shows one Example of the reflection type screen of this invention. The rear view which shows the other Example of the reflection type screen of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 .... Support body 2 ... Light diffusion layer 3 ... Perspective part 4 ... Part 5 with light diffusion layer ...・ Reflection layer 6 ・ ・ ・ ・ ・ ・ Black part 7 ・ ・ ・ ・ ・ ・ Reflective screen

Claims (5)

  A reflective screen having a light diffusing layer on one surface of a support, wherein the screen comprises a portion having a light diffusing layer and a portion having transparency in a periodic or random mixture, and the light diffusing layer. The reflective screen characterized in that the portion having the layer has light reflectivity, and the light diffusion layer is formed of a light diffusing agent and a transparent binder made of glass or curable resin.   2. The reflective screen according to claim 1, wherein the portion having the light diffusion layer has a screen gain of 0.7 or more.   The reflective part according to claim 1 or 2, wherein the part having transparency has a haze of 40% or less in JIS K7136: 2000 and a total light transmittance of 80% or more in JIS K7361-1: 1997. screen.   The reflective screen according to claim 1, wherein the transparent part is a through hole.   5. The reflective screen according to claim 1, wherein when viewed from the support side, the portion corresponding to the portion having the light diffusion layer is black. 6.

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