JPWO2017073512A1 - Reflective screen - Google Patents

Abstract

A reflective screen having an uneven surface on the front surface where ink writing and erasure of the writing are performed, and an image is projected from the front to the uneven surface, the front surface being opposite to the front surface. A transparent plate that transmits light of the image, a light scattering layer that scatters light transmitted through the transparent plate, and light from the light scattering layer toward the light scattering layer toward the rear surface that is a surface. A reflective screen having light reflecting layers in this order, wherein the light scattering layer is in close contact with the transparent plate, and the internal transmittance of the light scattering layer is 21% to 70%.

Description

  The present invention relates to a reflective screen.

  2. Description of the Related Art In recent years, a reflective screen has been developed that has an uneven surface on which ink writing and erasure of writing are performed on the front surface, and an image is projected from the front onto the uneven surface (see, for example, Patent Document 1). Ink can be written on the projected image.

  The reflective screen described in Patent Document 1 has a glass plate and a layer containing a light diffusing paint or pigment. The glass plate has an uneven surface on the surface, and writing of characters and figures on the uneven surface and erasure of the writing can be performed. The layer containing the light diffusing paint or pigment is formed on the back surface of the glass plate and reflects light incident on the surface of the glass plate.

Japanese Unexamined Patent Publication No. 2003-237295 (paragraphs 0011, 0013, 0014)

  The reflective screen described in Patent Document 1 reflects most of the light of the projected image only by diffuse reflection. For this reason, the video is easily blurred and the video visibility is low.

  In addition, conventionally, if the unevenness of the uneven surface is too large, it is difficult to remove ink from the inside of the recess, and if the uneven surface is too small, hot spots are likely to occur, improving the erasability of writing and generating hot spots. It was difficult to achieve a balance with the suppression.

  Here, the hot spot is a phenomenon in which the central portion of the reflective screen appears bright and bright when an image is projected on the reflective screen. This phenomenon occurs when the front surface of the reflective screen regularly reflects incident light.

  The present invention has been made in view of the above problems, and a first object thereof is to provide a reflective screen with improved image visibility. A second object of the present invention is to provide a reflective screen that improves the erasability of writing with ink and suppresses the occurrence of hot spots.

In order to achieve the first object, according to the first aspect of the present invention,
A reflective screen having an uneven surface on the front surface where writing with ink and erasure of the writing are performed, and an image is projected from the front to the uneven surface,
A transparent plate that transmits light of the image, a light-scattering layer that scatters light transmitted through the transparent plate, and light from the light-scattering layer toward the rear surface that is the opposite surface of the front surface from the front surface. It has a light reflecting layer that reflects toward the scattering layer in this order,
The light scattering layer is in close contact with the transparent plate, and a reflective screen is provided in which the light scattering layer has an internal transmittance of 21% to 70%.

In order to achieve the second object, according to the second aspect of the present invention,
A reflective screen having an uneven surface on the front surface where writing with ink and erasure of the writing are performed, and an image is projected from the front to the uneven surface,
The concavo-convex surface occupies 20% of the total area of the concavo-convex surface in plan view and a frame-shaped outer peripheral portion having a certain width from the outer periphery of the concavo-convex surface, and the concavo-convex surface surrounded by the outer peripheral portion in plan view Having a central portion that occupies the remaining 80% of the total area of
A reflective screen is provided in which the following formulas (1) and (2) are established in an arbitrary square range of 50 mm in length and 50 mm in width in the central portion.
Rc _ave / RSm _ave ≦ 0.64 (1)
Rc _ave ≧ 1 μm (2)
Rc _ave : 10-point average of average height Rc of roughness curve elements RSm _ave : 10-point average of average length RSm of roughness curve elements

  According to the first aspect of the present invention, a reflective screen with improved video visibility is provided. Moreover, according to the second aspect of the present invention, there is provided a reflective screen that improves the erasability of writing with ink and suppresses the occurrence of hot spots.

It is a front view of the reflection type screen by one Embodiment. It is a top view of the reflection type screen by one Embodiment. It is sectional drawing of the reflection type screen by one Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted. In this specification, “to” representing a numerical range means a range including numerical values before and after the numerical range. Further, in this specification, “plan view” means viewing from the normal direction of the front surface of the reflective screen.

  FIG. 1 is a front view of a reflective screen according to an embodiment. In FIG. 1, a dotted line indicates a boundary line between the outer peripheral portion 13 a of the uneven surface 13 and the central portion 13 b of the uneven surface 13. The boundary line is illustrated for convenience, and may not be visually confirmed. FIG. 2 is a top view of a reflective screen according to one embodiment. In FIG. 2, P is a projector, U1 is a user facing the center front of the reflective screen 10, and U2 is a user observing reflected light having the same reflection angle as the incident angle of incident light from the projector P to the reflective screen 10. Show. FIG. 3 is a cross-sectional view of a reflective screen according to an embodiment.

  The reflective screen 10 has a front surface 11 and a rear surface 12 opposite to the front surface 11, and has an uneven surface 13 on the front surface 11. Writing with ink and erasing of the writing are performed on the uneven surface 13. For writing with ink, a writing instrument such as a dedicated marker, a printer head, or the like is used. To erase the writing, a character eraser, a solvent, or the like is used. Further, an image is projected from the front onto the uneven surface 13. A projector P or the like is used for video projection.

  The reflective screen 10 may be surrounded by a frame (not shown). The frame may be provided with a hanging tool or a leg, and a caster may be attached to the leg. The reflective screen 10 is used indoors, for example. The place where the reflective screen 10 is used is not particularly limited. For example, the reflective screen may be applied to a vehicle or a wall material of a building.

  The uneven surface 13 occupies the entire front surface 11 in FIGS. 1 to 2, but may occupy only a part of the front surface 11. In the latter case, the remaining part of the front surface 11 may be a smooth surface without unevenness. Moreover, the number of the uneven surfaces 13 may be plural, and the plural uneven surfaces 13 may be arranged at intervals.

  The shape of the uneven surface 13 is a rectangle in FIG. The vertical dimension L1 of the uneven surface 13 is, for example, 300 mm or more. Further, the lateral dimension L2 of the uneven surface 13 is, for example, 500 mm or more. In addition, the shape of the uneven surface 13 may be various.

  The uneven surface 13 has an outer peripheral portion 13a and a central portion 13b. The outer peripheral portion 13 a is a frame-shaped portion that occupies 20% of the entire area of the uneven surface 13 and has a certain width from the outer peripheral edge of the uneven surface 13 in plan view. The width of the outer peripheral portion 13a is determined according to the shape and dimensions of the uneven surface 13 so that the ratio of the outer peripheral portion 13a to the uneven surface 13 in a plan view is 20%. The central portion 13b is a portion that is surrounded by the outer peripheral portion 13a and occupies the remaining 80% of the entire area of the uneven surface 13 in plan view.

It is preferable that the following expressions (1) and (2) are satisfied in an arbitrary square range of 50 mm in length and 50 mm in width in the central portion 13 b of the uneven surface 13.
Rc _ave / RSm _ave ≦ 0.64 (1)
Rc _ave ≧ 1 μm (2)
Rc _ave : 10-point average RSm of the average height Rc of the roughness curve element RSm _ave : Average height Rc of the 10-point average roughness curve element of the average length RSm of the roughness curve element, average length of the roughness curve element Each RSm is measured at a cutoff value λc = 250 μm in accordance with Japanese Industrial Standard (JIS B0601: 2013). Rc represents the height difference of the unevenness, and RSm represents the period of the unevenness. Rc _ave is an average of Rc measured at 10 points within a square range of 50 mm in length and 50 mm in width. RSm _ave is an average of RSm measured at 10 points within a square range of 50 mm long and 50 mm wide. Measurement points are randomly selected.

If the above formula (1) is satisfied in an arbitrary square area of 50 mm in length and 50 mm in the center part 13 b of the uneven surface 13, the period of the unevenness is sufficiently longer than the height difference of the unevenness. Ink can be easily removed from the inside of the recess, and erasure of writing with ink is easy. Rc _ave / RSm _ave is 0.64 or less, preferably 0.6 or less, as described in Formula (1), for example.

In addition, if the above formula (2) is satisfied in an arbitrary square range of 50 mm in length and 50 mm in width in the central portion 13 b of the uneven surface 13, the height difference of the unevenness is sufficiently large, so that hot spots are generated. Can be suppressed. A hot spot is a phenomenon in which the central portion of the reflective screen 10 appears brightly when an image is projected on the reflective screen 10. This phenomenon occurs when the front surface 11 of the reflective screen 10 regularly reflects incident light, and can be observed at the position of the user U2 shown in FIG. In the present embodiment, since the height difference of the unevenness is sufficiently large, the reflection angle varies moderately, and the occurrence of hot spots can be suppressed. Rc _ave is, for example, 1 μm or more, preferably 3 μm or more as described in Formula (2).

  The above formulas (1) and (2) may be established at the central portion 13b, and may or may not be established at the outer peripheral portion 13a. This is because ink writing and video projection are often not performed on the outer peripheral portion 13a. However, the above formulas (1) and (2) are preferably established in a wider range so that the effect can be obtained in a wider range. The central portion 13b preferably occupies 90%, more preferably 95%, instead of occupying 80% of the total area of the uneven surface 13 in plan view. Correspondingly, the outer peripheral portion 13a preferably occupies 10%, more preferably 5%, instead of occupying 20% of the total area of the uneven surface 13 in plan view.

In addition to the above formulas (1) and (2), it is more preferable that the following formula (3) is satisfied in an arbitrary square range of 50 mm in length and 50 mm in the center portion 13 b of the uneven surface 13.
RSm _ave ≦ 15 μm (3)
If the above formula (3) is satisfied in an arbitrary square area of 50 mm length and 50 mm width in the central portion 13 b of the uneven surface 13, the period of the unevenness is sufficiently short, so that glare (scintillation) is suppressed. it can. Flickering is a phenomenon in which a fine speckled pattern can be seen due to the brightness of light. The speckled pattern is caused by light interference. In this embodiment, since the period of the unevenness is sufficiently shorter than the projected display dots, a spot pattern due to light interference can be suppressed.

  The above equation (3) only needs to be established at the central portion 13b, and may or may not be established at the outer peripheral portion 13a. This is because video is often not projected onto the outer peripheral portion 13a. However, the above formula (3) is preferably established in a wider range so that the effect can be obtained in a wider range. The central portion 13b preferably occupies 90%, more preferably 95%, instead of occupying 80% of the total area of the uneven surface 13 in plan view. Correspondingly, the outer peripheral portion 13a preferably occupies 10%, more preferably 5%, instead of occupying 20% of the total area of the uneven surface 13 in plan view.

  As shown in FIG. 3, the reflective screen 10 includes a glass plate 20, a light scattering layer 30, and a light reflecting layer 40 in this order from the front surface 11 toward the rear surface 12. The glass plate 20 corresponds to the transparent plate described in the claims.

  The glass plate 20 transmits image light. The glass plate 20 is colorless and transparent, but may be colored and transparent. The haze value of the glass plate 20 is 50% or less. If the haze value of the glass plate 20 is 50% or less, sufficient transparency can be obtained. The haze value of the glass plate 20 is usually 1% or less.

  The haze value is measured in accordance with Japanese Industrial Standard (JIS K7136), and the transmitted light that passes through the test plate to be measured in the plate thickness direction is more than 2.5 ° from the incident light due to forward scattering. As a percentage. As a light source used for measuring the haze value, a D65 light source described in Japanese Industrial Standard (JIS Z8720: 2012) is used.

  Examples of the glass of the glass plate 20 include soda lime glass, aluminosilicate glass, alkali-free glass, and borosilicate glass. The glass may be either untempered glass or tempered glass. Untempered glass is obtained by forming molten glass into a plate shape and slowly cooling it. Examples of the molding method include a float method and a fusion method. The tempered glass may be either physically tempered glass or chemically tempered glass. Physically tempered glass strengthens the glass surface by rapidly cooling a uniformly heated glass plate from a temperature near the softening point and generating a compressive stress on the glass surface due to the temperature difference between the glass surface and the inside of the glass. . Chemically tempered glass is obtained by strengthening the glass surface by generating a compressive stress on the glass surface by an ion exchange method or the like.

  The glass plate 20 is a flat flat plate in FIG. 2, but may be a curved plate. Gravity molding, press molding, or the like is used as bending molding for bending a flat plate into a curved plate. In bending, the glass surface may be strengthened by rapidly cooling a uniformly heated glass plate from a temperature near the softening point and generating a compressive stress on the glass surface due to a temperature difference between the glass surface and the inside of the glass. Physically tempered glass is obtained. The chemically strengthened glass can be obtained by generating a compressive stress on the glass surface by an ion exchange method or the like after bending.

  Although the plate | board thickness of the glass plate 20 is not specifically limited, For example, they are 0.1 mm-20 mm.

  The front surface 21 of the glass plate 20 has an uneven surface. As a processing method of the glass plate for forming the uneven surface on the glass plate 20, a general processing method is used, and for example, an embossing method, an etching method, a blasting method, etc. are used alone or in any combination.

  In the mold pressing method, the mold is pressed against the glass plate 20 having a softening point or higher, and the unevenness of the mold is transferred to the glass plate 20, thereby forming an uneven surface on the front surface of the glass plate 20.

  In the etching method, an uneven surface is formed on the front surface of the glass plate 20 by immersing the glass plate 20 in an etching solution. The etching solution is an aqueous solution containing, for example, about 10% to 20% hydrogen fluoride, and the immersion time is, for example, about 30 seconds to 600 seconds.

  In the blast method, an uneven surface is formed on the front surface of the glass plate 20 by spraying media onto the glass plate 20. For example, ceramic particles are used as the media. As the ceramic of the ceramic particles, one having a higher level than the glass of the glass plate 20 (corrected Mohs hardness: about 4.5 to 6.5) is used. For example, alumina (corrected Mohs hardness: 12), silicon carbide (corrected) Mohs hardness: 13) and zircon (modified Mohs hardness: 9) are used. The average particle size of the ceramic abrasive grains is, for example, 4 μm to 30 μm (corresponding to particle size # 400 to # 3000). The media may be one in which ceramic particles are kneaded into an elastic body. The media is ejected using a general blasting device.

A blasting apparatus injects media with compressed gas, such as compressed air. The blasting device may be either a direct pressure type that pressurizes and injects a medium put in the pressurized tank together with the compressed gas, or a suction type that combines and injects the medium into a compressed gas stream. Media ejection conditions may be general. The injection pressure is, for example, 0.3 MPa to 0.5 MPa, and the processing time per unit area is, for example, 500 seconds / m ² to 600 seconds / m ² .

  The front surface 21 of the glass plate 20 may be exposed, but may be covered with a covering layer 50 as shown in FIG. The coating layer 50 only needs to cover at least a part of the front surface 21 of the glass plate 20.

  The covering layer 50 has an uneven surface that follows the uneven surface of the glass plate 20 on the front surface 51 thereof. Writing with ink, erasing the writing, projecting an image, and the like are performed on the uneven surface of the coating layer 50.

  The covering layer 50 preferably has a lower affinity with ink than the glass plate 20. Erasing of writing with ink becomes easy.

  The coating layer 50 preferably contains a silicone-based cured product from the viewpoint of affinity with ink and durability. The silicone-based cured product can be obtained, for example, by condensation-curing at least one of a curable silicone resin and a curable silicone oligomer.

  In general, the difference between a silicone resin and a silicone oligomer is the molecular weight, and a relatively low molecular weight silicone resin is called a silicone oligomer. The silicone oligomer generally refers to a dimer or trimer having a molecular weight of about 1000. Silicone resins and silicone oligomers are composed of silicon-containing bond units called M units, D units, T units, and Q units.

  The curable silicone resin and the curable silicone oligomer are resins having a branched structure mainly composed of T units or Q units, a resin composed only of T units, and a resin composed only of Q units. There are resins composed of T units and Q units. These resins may further contain a small amount of M units and D units.

  In the curable silicone resin and the curable silicone oligomer, the T unit has one silicon atom, one hydrogen atom or monovalent organic group bonded to the silicon atom, and another silicon atom. This is a unit having three bonded oxygen atoms (or three functional groups capable of bonding to other silicon atoms).

Monomers forming the silicon-containing bond units _is represented by _{(R'-) a Si (-Z)} 4-a. However, a represents an integer of 0 to 3, R ′ represents a hydrogen atom or a monovalent organic group, Z represents a monovalent functional group that can be bonded to a hydroxyl group, a chlorine atom, or another silicon atom. When Z is a hydrolyzable group, examples of the hydrolyzable group include an alkoxy group, an acyloxy group, and an isocyanate group.

  From the viewpoint of hardness and durability, a silicon-containing bond unit having a T unit as a main structural unit is preferably used. Here, what makes T unit a main structural unit means the organopolysiloxane whose ratio of the number of T unit with respect to the total number of M unit, D unit, T unit, and Q unit is 50%-100%. More preferably, an organopolysiloxane having a ratio of the number of T units of 70% to 100% is used. In addition to the T unit, other units contained in a small amount are preferably D units and Q units.

  As the curable silicone resin and the curable silicone oligomer, commercially available compounds can be used. For example, KR220L, KR220LP, KR242A, KR251, KR211, KR255, KR300, KR311, KR2621-1 manufactured by Shin-Etsu Chemical Co., Ltd., SR2402, AY42-163, Z6018 manufactured by Toray Dow Corning Co., Ltd., etc. . Curing silicone oligomers include Shin-Etsu Chemical KC89S, KR515, KR500, X400-9225, X40-9246, X40-9250, KR401N, X40-9227, KR510, KR9218, KR213, KR400, X40-2327, KR401, etc. Can be used. One of these may be used alone, or a plurality of types may be used in combination.

The covering layer 50 may contain a fluorine-based compound in addition to the silicone-based cured product in order to improve the erasability of writing with ink. The fluorine-based _compound, a compound containing a C _{n F 2n + 1} group or _C n _{F 2n} O groups are preferred. Note that n is a natural number of 1 or more.

  The coating layer 50 is formed by applying a coating liquid to the uneven surface of the glass plate 20 and curing the applied coating liquid. As the coating method, a known method can be used, and for example, methods such as spray coating, slit coating, die coating, spin coating, dip coating, curtain coating, and the like can be used. The coating liquid contains at least one of a curable silicone resin and a curable silicone oligomer, and a solvent. The coating solution may further contain at least one of a curing catalyst, a fluorine-based compound, a leveling agent, and a pigment as necessary. In order to accelerate curing, it is preferable to perform heating and / or active energy ray irradiation. The layer thickness of the coating layer 50 is preferably 0.01 μm or more and 20 μm, and more preferably 0.1 μm or more and 10 μm or less. If the layer thickness of the coating layer 50 is less than 0.01 μm, the durability is insufficient. When the layer thickness of the coating layer 50 exceeds 20 μm, the difference in height of the uneven surface of the coating layer 50 becomes small, and the generation of hot spots cannot be sufficiently suppressed.

  In addition, although the reflective screen 10 of this embodiment has the coating layer 50 on the opposite side to the light-scattering layer 30 on the basis of the glass plate 20, it does not need to have the coating layer 50. FIG. Writing with ink, erasing the writing, projecting an image, or the like may be performed on the uneven surface of the glass plate 20.

  As described above, the front surface 21 of the glass plate 20 has an uneven surface, whereas the rear surface 22 of the glass plate 20 preferably has almost no unevenness. The arithmetic average roughness Ra of the rear surface 22 of the glass plate 20 is, for example, 5 μm or less, preferably 1 μm or less, more preferably 0.1 μm or less.

  Arithmetic mean roughness Ra is “arithmetic mean roughness” described in Japanese Industrial Standard (JIS B0601: 2013) and can be measured by a commercially available surface roughness measuring machine.

  In this embodiment, the glass plate 20 is used as the transparent plate from the viewpoints of hardness, durability, and texture, but a resin plate may be used. Examples of the resin for the resin plate include polycarbonate, acrylic, and vinyl chloride. Further, the transparent plate may have either a single layer structure or a multilayer structure, for example, laminated glass. The laminated glass has a first glass plate, a second glass plate, and an intermediate film that joins the first glass plate and the second glass plate. Regardless of the configuration of the transparent plate, the haze value of the transparent plate is, for example, 50% or less, and the thickness of the transparent plate is, for example, 0.1 mm to 20 mm.

  Moreover, in this embodiment, although the front surface of the transparent plate is an uneven surface, it may be a flat surface. In this case, a transparent uneven layer is formed on the front surface of the transparent plate. As a method for forming the transparent uneven layer, for example, an embossing method, an etching method, a blasting method, an imprinting method, a coating method or the like is used alone or in any combination. As the embossing method, the etching method, and the blasting method, the same method as the method for forming the uneven surface of the glass plate 20 described above can be used. In the imprint method, a transparent material is sandwiched between a transparent plate and a mold, the uneven pattern of the mold is transferred to the transfer material, and the transfer material is solidified to form a transparent uneven layer. Solidification includes photocuring and heat curing. In the coating method, a concavo-convex layer is formed by applying a coating liquid containing fine particles and a binder to a transparent plate and solidifying the applied coating liquid. Writing to the concavo-convex layer may be performed with ink, erasing of the writing, and projection of video, or writing to the coating layer 50 covering the concavo-convex layer may be performed with ink writing, erasing of the writing, projection of video, or the like. Also good.

  As a method of applying the coating liquid to the transparent plate by a coating method, a method of coating by a spray method can be used. In the spray method, a coating liquid containing fine particles and a binder is sprayed by applying pressure from a thin nozzle to create droplets and deposit them on the surface to create an uneven surface. The fine particles can be appropriately selected from inorganic fine particles, organic fine particles, and the like, and the binder can also be appropriately selected from organic materials and inorganic materials.

  The light scattering layer 30 scatters the light transmitted through the glass plate 20. Thereby, since the light-scattering layer 30 exhibits white, the contrast of the image visually recognized by the users U1 and U2 is improved. The light scattering layer 30 is formed of a plurality of materials having different refractive indexes. The light scattering layer 30 includes, for example, a matrix portion and light scattering portions scattered in the matrix portion.

  The matrix portion may include either an inorganic material or an organic material. Examples of the inorganic material include silicon dioxide. Examples of the organic material include polyvinyl alcohol resin, polyvinyl butyral resin, epoxy resin, acrylic resin, polyester resin, polycarbonate resin, melamine resin, polyurethane resin, urethane acrylate resin, and silicone resin. The organic material may be a thermosetting resin, a photocurable resin, or a thermoplastic resin.

  The light scattering portion may include either light scattering particles or voids, or may include both. The light scattering particles may be either inorganic particles or organic particles. Examples of the inorganic particle material include silicon dioxide, titanium oxide, aluminum oxide, zirconium oxide, and zinc oxide. Examples of the organic particle material include polystyrene resin, acrylic resin, and polyurethane resin. Further, the light scattering particles may be porous particles. The pore diameter of the pores of the porous particles is preferably 2 to 50 nm. The number average particle diameter of the light scattering particles is 100 nm to 10 μm. The void is formed by a foaming agent or the like. The number average particle diameter of the voids is 100 nm to 10 μm. When the light scattering portion includes voids, the light scattering layer 30 is a porous layer. The ratio of the light-scattering part which occupies for the light-scattering layer 30 is 10 volume%-99 volume%, for example, Preferably it is 20 volume%-98 volume%, More preferably, it is 30 volume%-90 volume%.

  The light scattering layer 30 may further include a light absorbing portion in addition to the matrix portion and the light scattering portion. The light absorbing portion includes light absorbing particles such as carbon black and titanium black. The ratio of the light absorption part which occupies for the light-scattering layer 30 is 0.01 volume%-5 volume%, for example, Preferably it is 0.1 volume%-3 volume%. The light absorber improves the contrast of the image.

  In addition, although the light-scattering layer 30 of this embodiment contains a matrix part and a light-scattering part, it may be what accumulated fiber like paper. The light scattering layer 30 only needs to be able to scatter light.

  The light scattering layer 30 is in close contact with the glass plate 20, and no air layer exists between the glass plate 20 and the light scattering layer 30. The refractive index difference between the glass plate 20 and the light scattering layer 30 is smaller than the refractive index difference between the air layer and the light scattering layer 30. Therefore, the light transmitted through the glass plate 20 is incident on the light scattering layer 30 without being substantially reflected at the interface between the glass plate 20 and the light scattering layer 30.

  In the present embodiment, the light scattering layer 30 and the glass plate 20 are in close contact, but may not be in close contact. It is sufficient that no air layer exists between the glass plate 20 and the light scattering layer 30, and a transparent adhesive layer may exist between the glass plate 20 and the light scattering layer 30.

  The internal transmittance of the light scattering layer 30 is 21% to 70%. If the internal transmittance of the light scattering layer 30 is 21% or more, the intensity of the reflected light forward due to the diffuse reflection of the light scattering layer 30 is weak, and image blurring is hardly recognized by the users U1 and U2 ahead. . If the internal transmittance of the light scattering layer 30 is 70% or less, the white color of the light scattering layer 30 covers the color of the light reflecting layer (for example, silver) during video projection, and the background color of the video appears white. The contrast of images visually recognized by the users U1 and U2 is good. Therefore, if the internal transmittance of the light scattering layer 30 is 21% to 70%, the video visibility is good. The internal transmittance of the light scattering layer 30 is preferably 30% to 70%.

The internal transmittance A1 of the light scattering layer 30 is calculated, for example, by measuring the external transmittance A2 of the glass plate 20 with the light scattering layer 30 and using the following equation (5). A light source with a wavelength of 550 nm can be used for measuring the external transmittance.
A1 = A2-A3 (5)
A3: Absorption rate of glass plate 20 Here, since the difference in refractive index between the glass plate 20 and the light scattering layer 30 is small, reflection at the interface between the glass plate 20 and the light scattering layer 30 is ignored. The absorption rate A3 of the glass plate 20 can be calculated from the plate thickness of the glass plate 20 and the absorption coefficient of the glass plate 20.

  The haze value of the light scattering layer 30 is appropriately set according to the internal transmittance of the light scattering layer 30. The haze value of the light scattering layer 30 is, for example, 50% to 100%. If the haze value of the light scattering layer 30 is 50% or more, the light scattering inside the light scattering layer 30 is strong, and the white color of the light scattering layer 30 can cover the color of the light reflecting layer 40. The haze value of the light scattering layer 30 is preferably 60% or more.

  The haze value of the light scattering layer 30 is represented, for example, by measuring the haze value of the glass plate 20 with the light scattering layer 30. This is because the haze value of the glass plate 20 is 1% or less, and the influence of forward scattering by the glass plate 20 can be substantially ignored.

  The layer thickness of the light scattering layer 30 is appropriately set according to the internal transmittance of the light scattering layer 30, the haze value of the light scattering layer 30, and the like. The layer thickness of the light scattering layer 30 is, for example, 1 μm to 80 μm. If the thickness of the light scattering layer 30 is 80 μm or less, the internal transmittance of the light scattering layer 30 is sufficiently high, and the intensity of light reflected forward by the diffuse reflection of the light scattering layer 30 is sufficiently weak. Further, when the thickness of the light scattering layer 30 is 1 μm or more, the internal transmittance of the light scattering layer 30 is sufficiently low, the haze value of the light scattering layer 30 is sufficiently high, and the white color of the light scattering layer 30 is reflected by light. The color of layer 40 can be obscured. The layer thickness of the light scattering layer 30 is preferably 1 μm to 100 μm. When porous particles are used as the light-scattering particles of the light-scattering layer 30, the internal transmittance and haze value of the light-scattering layer 30 can be easily adjusted to the above ranges.

  The light scattering layer 30 is formed by applying a liquid obtained by mixing the material of the light scattering portion with the material of the matrix portion to the glass plate 20 or the light reflecting layer 40 and then drying or curing. The liquid may contain a solvent. A sheet-shaped light scattering layer 30 formed in advance may be laminated on the glass plate 20 or the light reflection layer 40. The sheet-like light scattering layer 30 can be produced by applying the liquid onto a film such as PET and then drying or curing, or by extruding a resin material in which a light scattering material is mixed with a thermoplastic resin. There is a way to make it.

  The light reflecting layer 40 reflects the light from the light scattering layer 30 toward the light scattering layer 30. The light reflecting layer 40 includes a light reflecting material, for example, a metal. The metal contained in the light reflecting layer 40 is preferably a single metal or alloy containing at least one of silver and aluminum from the viewpoint of reflectance and color.

  For example, the light reflecting layer 40 includes a metal layer. Examples of the method for forming the metal layer include a method of attaching a metal foil or a metal plate, a physical vapor deposition method such as sputtering or a vacuum vapor deposition method, a method using silver mirror reaction or plating.

  Moreover, the light reflection layer 40 may include a resin and light reflective particles scattered in the resin. In this case, the light reflecting layer 40 is formed, for example, by applying a liquid obtained by mixing a resin composition and light reflecting particles to the light scattering layer 30 and solidifying the applied liquid. The liquid may contain a solvent. Alternatively, when the resin is a thermoplastic resin, it is formed by extruding a resin material obtained by mixing the resin composition and the light reflecting particles into a sheet. For example, metal particles are used as the light reflective particles. The shape of the light reflective particles may be either spherical or plate-like, but is preferably plate-like from the viewpoint of reflectivity.

The light reflecting layer 40 may include a dielectric multilayer film. The dielectric multilayer film can be formed by a method of laminating a plurality of dielectrics having different refractive indexes. Examples of the high refractive index dielectric include Si ₃ N ₄ , AlN, NbN, SnO ₂ , ZnO, SnZnO, Al ₂ O ₃ , MoO, NbO, TiO ₂ and ZrO ₂ . Examples of the dielectric having a lower refractive index than that of the high refractive index include SiO ₂ , MgF ₂ , and AlF ₃ .

  The light reflecting layer 40 includes at least one of (1) a metal layer, (2) a layer including a resin and light reflecting particles scattered in the resin, and (3) a dielectric multilayer film, More than one may be included. The combination is not particularly limited.

  The light reflection layer 40 sets the sum of regular reflectance, diffuse reflectance, external transmittance, and absorption rate to 100%. The sum of the regular reflectance and the diffuse reflectance is the total reflectance. As a measurement sample for regular reflectance and diffuse reflectance, a sample in which a light reflecting layer 40 is formed on a glass substrate (specifically, a 2 mm thick soda lime glass plate) is used.

  The regular reflectance of the light reflection layer 40 is measured as an absolute reflectance. The specular reflectance of the light reflecting layer 40 is such that light having a wavelength of 550 nm is incident on the surface of the light reflecting layer 40 of the measurement sample on the glass substrate side from the glass substrate side at an incident angle of 5 ° and reflected in the direction of regular reflection. The measured light is detected with a spectrophotometer to obtain a measured value. A commercially available spectrophotometer (for example, model: U-4100, manufactured by Hitachi, Ltd.) is used.

  On the other hand, the diffuse reflectance of the light reflecting layer 40 is calculated by subtracting the regular reflectance of the light reflecting layer 40 from the total reflectance of the light reflecting layer 40. The total reflectance of the light reflecting layer 40 is measured as an absolute reflectance. The total reflectance of the light reflecting layer 40 is set such that a measurement sample is placed inside an integrating sphere, and the incident angle is 5 ° from the glass substrate side with respect to the surface of the light reflecting layer 40 of the measurement sample at a wavelength of 550 nm. Incident light and the light reflected in various directions are collected by an integrating sphere and detected by a spectrophotometer to obtain a measured value.

  The regular reflectance of the light reflecting layer 40 is preferably 40% or more. If the regular reflectance of the light reflecting layer 40 is 40% or more, the image is not blurred. The regular reflectance of the light reflecting layer is more preferably 50% or more.

  The diffuse reflectance of the light reflecting layer 40 is preferably less than 40%. If the diffuse reflectance of the light reflection layer 40 is less than 40%, there is almost no blurring of the image.

  The total of the regular reflectance and diffuse reflectance of the light reflecting layer 40, that is, the total reflectance of the light reflecting layer 40 is preferably 30 to 100%.

  The external transmittance of the light reflecting layer 40 is preferably less than 50%. If the external transmittance of the light reflecting layer 40 is less than 50%, the brightness of the image is sufficiently obtained.

  The light reflecting layer 40 may be a metal layer. In this case, the light reflecting layer 40 is formed on the light scattering layer 30 by plating, sputtering, vapor deposition, or the like.

  Although the light reflecting layer 40 is in close contact with the light scattering layer 30 in FIG. 3, it may not be in close contact with the light scattering layer 30, and a gap may be formed between the light reflecting layer 40 and the light scattering layer 30. The light reflecting layer 40 may be formed separately from the light scattering layer 30.

  It is preferable that the front surface 41 of the light reflecting layer 40 has almost no unevenness. The arithmetic average roughness Ra of the front surface 41 of the light reflecting layer 40 is, for example, 5 μm or less, preferably 1 μm or less.

  The manufacturing method of the reflection type screen includes a step of manufacturing a laminated body including the glass plate 20, the light scattering layer 30, and the light reflection layer 40. A resin plate may be used as a transparent plate instead of the glass plate 20.

  Reflective screens are suitable for applications where projection and erasing are performed.

For example, the following uses are mentioned as a window etc. in structures, such as a building.
・ Display of living space interiors, commercials, video for education ・ Display of information and advertisements at car dealers ・ Use of advertising displays, information notifications, events, etc. as glass doors of supermarkets, retail and public buildings ・Use as a glass wall that can change the pattern of the wallpaper ・ Background board of the stadium ・ Studio ・ Partition of the bathroom of the hotel ・ Display of characters, signs, images, videos at airports, stations, hospitals, schools ・ Temples, temples, Display of regional and tourism information in religious facilities such as shrines and churches ・ Space production in commercial facilities ・ Display of characters, signs, images, and videos in stadium ・ Projection of information in the kitchen and video for individuals ・ Whiteboard As a member that can be written and displayed, it is used in schools and meeting rooms. Also used with user interface.

The following uses are mentioned as a use in a table top, a casing, etc.
・ Restaurant table tops, desks (desktops), kitchen counters, tabletop partitions, vending machines.

Moreover, the following uses are mentioned as a use in a vehicle.
・ Suspended inside advertisements inside railway vehicles ・ Partition part of Shinkansen ・ Displays TV and DVD images as in-car partitions in automobiles.

  In addition, it is possible to improve the design by using it for floors, steps of stairs, etc., or to display “Caution”.

[Test Examples 1 to 8]
In Test Examples 1 to 8, test pieces having the same configuration except for the surface roughness of the front surface of the glass plate were prepared, and each test piece was evaluated. Each test piece was composed only of a glass plate and a coating layer formed on the front surface of the glass plate. Since the presence or absence of the light scattering layer or the light reflecting layer does not affect the evaluation, the light scattering layer or the light reflecting layer was not formed.

  In Test Examples 1 to 8, the surface roughness of the front surface of the glass plate was adjusted according to the processing conditions of the front surface of the glass plate. Specifically, as shown in Table 1, in Test Examples 1 to 7, a substantially uniform uneven surface is formed on the entire front surface of the glass plate by processing A to G, and in Test Example 8, an uneven surface is formed on the front surface of the glass plate. Did not form. The shape of the front surface of the glass plate was a square having a length of 90 mm and a width of 90 mm in plan view.

  Processing A was performed by two-stage blasting. In the first stage of blasting, the blasting apparatus was a direct pressure type, the media was alumina # 600, the nozzle distance was 60 mm, the injection pressure was 0.3 MPa, and the processing time per sheet was 6.72 seconds. The second-stage blasting was performed under the same processing conditions as the first-stage blasting, except that the media used were kneaded ceramic particles instead of alumina # 600.

  Processing B was performed under the same processing conditions as Processing A, except that alumina # 800 was used instead of alumina # 600 as a medium in the first stage of blasting in the two-stage blasting.

  Process C was performed under the same processing conditions as Process A, except that alumina # 1000 was used instead of alumina # 600 as the medium in the first stage of blasting of the two stages of blasting.

  Processing D was performed in two stages, blasting and subsequent etching. The first stage blasting process D was performed under the same processing conditions as the first stage blasting process A. The second etching process in the processing D was performed by immersing the glass plate in an aqueous solution of 10% hydrofluoric acid for 60 seconds.

  Processing E was performed in two stages: blasting and subsequent etching. The first stage blasting process E was performed under the same processing conditions as the first stage blasting process A except that alumina # 480 was used instead of alumina # 600 as the media. The second stage etching process in the process E was performed under the same processing conditions as the second stage etching process in the process D.

  Processing F was performed by blasting in only one stage. The blasting process F was performed under the same processing conditions as the first stage blasting process A except that alumina # 480 was used instead of alumina # 600 as the media.

  Processing G was performed by blasting in only one stage. The blasting process G is performed under the same processing conditions as the first stage blasting process A.

  In Test Examples 1 to 8, the coating layer was formed by applying the following coating liquid to the entire front surface of the glass plate with a spin coater and drying the applied coating liquid at 150 ° C. for 30 minutes. As the coating solution, a solution obtained by diluting a silicone oligomer coating agent KR400 (manufactured by Shin-Etsu Chemical Co., Ltd.) with toluene to 50% was used. The layer thickness of the coating layer was 2 μm. In addition, the shape of the front surface of the coating layer was a square having a length of 90 mm and a width of 90 mm in plan view.

  The evaluation items of the test piece were (1) surface roughness of the front surface of the coating layer, (2) erasability of writing with ink (presence / absence of unerased), (3) presence / absence of hot spot, and (4) presence / absence of glare. did.

The surface roughness (Rc _ave , RSm _ave ) of the front surface of the coating layer was measured with an Olympus laser microscope (OLS4000, objective lens magnification 10 ×, cutoff value λc 250 μm). The measurement locations were five locations at the four corners and the center in the central portion (here, the portion occupying 80% of the front surface) of the coating layer. The five measurement areas partially overlap. By measuring these five locations, the tendency of the overall surface roughness can be found. For each location, Rc _ave and RSm _ave were measured.

  The erasability of writing with ink is such that writing using a whiteboard marker and erasing of writing using a dedicated character eraser are repeated 10 times in the center of the front surface of the coating layer, and then erased to the extent that it can be visually recognized. The evaluation was based on whether there was a rest.

  The presence / absence of a hot spot was evaluated by projecting an image from the projector on the front surface of the coating layer and determining whether the center of the test piece appears bright and shining at the position of the user U2 shown in FIG.

  The presence or absence of glare was evaluated by projecting an image from the projector onto the front surface of the coating layer, and seeing whether or not a fine spot pattern due to light and dark was visible at the position of the user U1 shown in FIG.

  Table 1 shows the evaluation results of the test pieces.

表１から明らかなように、試験例１〜５によれば、Ｒｃ_ａｖｅ／ＲＳｍ_ａｖｅが０．６４以下、且つＲｃ_ａｖｅが１μｍ以上であるので、消し残りもホットスポットも無かった。一方、試験例６および７によれば、Ｒｃ_ａｖｅ／ＲＳｍ_ａｖｅが０．６４を超えているため、消し残りが有った。また、試験例８によれば、Ｒｃ_ａｖｅが１μｍ未満であるので、ホットスポットが有った。

As is clear from Table 1, according to Test Examples 1 to 5, since Rc _ave / RSm _ave was 0.64 or less and Rc _ave was 1 μm or more, there was no unerased residue and no hot spot. On the other hand, according to Test Examples 6 and 7, since Rc _ave / RSm _ave exceeded 0.64, there was an unerased residue. Further, according to Test Example 8, there was a hot spot because Rc _ave was less than 1 μm.

Further, as apparent from Table 1, according to Test Examples 1 to 3, 7 and 8, since RSm _ave was 15 μm or less, there was no glare. On the other hand, according to Test Examples 4 to 6, since RSm _ave exceeded 15 μm, there was glare.

[Test Examples 9 to 14]
In Test Examples 9 to 14, a reflective screen having the same configuration was manufactured except for the thickness of the light scattering layer and the presence or absence of the light reflective layer, and each reflective screen was evaluated. In Test Examples 9 to 13, the reflective screen was composed of a coating layer, a glass plate, a light scattering layer, and a light reflection layer. On the other hand, in Test Example 14, the reflective screen was composed of a coating layer, a glass plate, and a light scattering layer.

  In Test Examples 9 to 14, an uneven surface was formed on the front surface of the glass plate by the same processing C as in Test Example 3 (see Table 1). A coating layer was formed on the uneven surface. Thereafter, a light scattering layer or the like was formed on the rear surface opposite to the uneven surface. Since the method for forming the coating layer is the same as in Test Examples 1 to 8, the description thereof is omitted.

  The light scattering layer was formed by applying the following light scattering paint to the rear surface of the glass plate with a bar coater and drying the applied light scattering paint at 150 ° C. for 30 minutes. The light scattering paint was prepared by adding light scattering particles (Nissan Chemical Industries, Ltd .: Light Star LA-S233A) to the following mixed solution and stirring.

  The mixed solution for the light scattering coating is added to polyvinyl alcohol (manufactured by Kanto Chemical Co., Inc., polyvinyl alcohol 2000) in distilled water, stirred at 70 ° C. for 1 hour, and then added to 2-propanol (manufactured by Junsei Chemical Co., Ltd.). It was produced by doing.

  In Test Examples 9 to 13, the light reflecting layer was formed by applying the following light reflecting paint to the light scattering layer with a bar coater and drying the applied light reflecting paint at 150 ° C. for 30 minutes. The light reflecting paint was prepared by adding light reflecting particles (Oike Kogyo Co., Ltd .: Al leaf powder) to the same mixed solution as the light scattering paint mixed solution and stirring.

  The evaluation items of the reflective screen were (1) the internal transmittance and haze value of the light scattering layer, the layer thickness, (2) the background color of the image, and (3) the presence or absence of image blur.

  For the measurement of the internal transmittance, haze value, and layer thickness of the light scattering layer, a glass plate with a light scattering layer produced for each test example under the same conditions as the reflective screen was used. In addition, the uneven | corrugated process was not given to the front surface of the glass plate with a light-scattering layer. The internal transmittance and haze value were measured as described above. The thickness of the layer was measured with an electron microscope.

  The background color of the image was evaluated visually by projecting the image from the projector onto the front surface of the reflective screen and at the position of the user U1 shown in FIG.

  The presence or absence of blurring of the image was evaluated by visual observation at the position of the user U1 shown in FIG.

  Table 2 shows the evaluation results of the reflective screen.

表２から明らかなように、試験例９〜１１によれば、光反射層が設けられており且つ光散乱層の内部透過率が２１％〜７０％であるので、映像の背景色が白色でコントラストが良好であり且つ映像のぼやけが無かった。一方、試験例１２によれば、光反射層が設けられているが光散乱層の内部透過率が２１％未満であるので、映像のぼやけが有った。また、試験例１３によれば、光反射層が設けられているが光散乱層の内部透過率が７０％を超えているので、光散乱層の白色が光反射層の銀色を隠しきれず、映像の背景色が灰白色であり、コントラストが悪かった。さらに、試験例１４によれば、光反射層を設けずに、投影された映像の光の大部分を拡散反射によって反射させたため、映像のぼやけが有った。

As apparent from Table 2, according to Test Examples 9 to 11, the light reflection layer is provided and the internal transmittance of the light scattering layer is 21% to 70%, so the background color of the video is white. The contrast was good and the image was not blurred. On the other hand, according to Test Example 12, although the light reflection layer was provided, the internal transmittance of the light scattering layer was less than 21%, so there was blurring of the image. Further, according to Test Example 13, the light reflection layer is provided, but the internal transmittance of the light scattering layer exceeds 70%, so the white color of the light scattering layer cannot hide the silver color of the light reflection layer, The background color of the image was grayish white and the contrast was poor. Further, according to Test Example 14, since most of the light of the projected image was reflected by diffuse reflection without providing the light reflection layer, the image was blurred.

  Although the embodiments of the reflective screen have been described above, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope of the gist of the present invention described in the claims. It is.

  For example, the reflective screen may further include a magnetic layer. The magnetic layer may include any of a soft magnetic material such as iron and a hard magnetic material such as a permanent magnet. The attractive force of the magnet can be used, and paper or the like can be fastened to the reflective screen, or the reflective screen can be attached to the wall.

  The reflective screen may further include a protective layer such as a corrosion prevention layer on the side opposite to the light scattering layer 30 with the light reflecting layer 40 as a reference. The light reflection layer 40 can be protected.

  Further, the reflection type screen may have transparent plates on both sides of the light scattering layer 30 and the light reflection layer 40. That is, the light scattering layer 30 and the light reflection layer 40 may be provided between the first transparent plate and the second transparent plate, and the light scattering layer 30 and the light reflection layer 40 are provided inside the laminated plate. May be. When each of the first transparent plate and the second transparent plate is a glass plate, a laminated glass is obtained as a laminated plate. The first transparent plate and the second transparent plate may both be a resin plate, or one may be a glass plate and the other a resin plate.

  Further, the light reflection layer 40 may be one in which diffuse reflection is more dominant than regular reflection. Examples of such a light reflection layer 40 include a layer in which spherical reflective particles are dispersed and a layer having a reflective uneven structure. The layer having a reflective concavo-convex structure can be obtained, for example, by applying a metal reflective film along the concavo-convex surface. The reflective uneven structure may be a random uneven structure, a regular uneven structure, or a hologram or the like.

  This application is based on Japanese Patent Application No. 2015-213945 filed with the Japan Patent Office on October 30, 2015, and Japanese Patent Application No. 2015-213946 filed with the Japan Patent Office on October 30, 2015. The entire contents of these applications are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 10 Reflective type screen 11 Front surface 12 Rear surface 13 Uneven surface 13a Outer peripheral part 13b Center part 20 Glass plate 30 Light scattering layer 40 Light reflection layer 50 Covering layer

In order to achieve the first object, according to the first aspect of the present invention,
A reflective screen having an uneven surface on the front surface where writing with ink and erasure of the writing are performed, and an image is projected from the front to the uneven surface,
From the front surface toward the rear surface opposite to the front surface, the transparent plate made of a glass plate that transmits the light of the image, the light scattering layer that scatters the light transmitted through the transparent plate, and the light scattering layer A light reflecting layer that reflects the light toward the light scattering layer in this order,
The light scattering layer is in close contact with the transparent plate, and a reflective screen is provided in which the light scattering layer has an internal transmittance of 21% to 70%.

In order to achieve the second object, according to the second aspect of the present invention,
A reflective screen having an uneven surface on the front surface where writing with ink and erasure of the writing are performed, and an image is projected from the front to the uneven surface,
A transparent plate made of a glass plate that transmits the light of the image from the front surface toward the rear surface that is the opposite surface of the front surface,
The concavo-convex surface occupies 20% of the total area of the concavo-convex surface in plan view and a frame-shaped outer peripheral portion having a certain width from the outer periphery of the concavo-convex surface, and the concavo-convex surface surrounded by the outer peripheral portion in plan view Having a central portion that occupies the remaining 80% of the total area of
A reflective screen is provided in which the following formulas (1) and (2) are established in an arbitrary square range of 50 mm in length and 50 mm in width in the central portion.
Rc _ave / RSm _ave ≦ 0.64 (1)
Rc _ave ≧ 1 μm (2)
Rc _ave : 10-point average of average height Rc of roughness curve elements RSm _ave : 10-point average of average length RSm of roughness curve elements

Reflective screen is suitable for applications where projection and write-out erase is performed.

Claims (9)

A reflective screen having an uneven surface on the front surface where writing with ink and erasure of the writing are performed, and an image is projected from the front to the uneven surface,
A transparent plate that transmits light of the image, a light-scattering layer that scatters light transmitted through the transparent plate, and light from the light-scattering layer toward the rear surface that is the opposite surface of the front surface from the front surface. It has a light reflecting layer that reflects toward the scattering layer in this order,
The reflective screen, wherein the light scattering layer is in close contact with the transparent plate, and the internal transmittance of the light scattering layer is 21% to 70%. A reflective screen having an uneven surface on the front surface where writing with ink and erasure of the writing are performed, and an image is projected from the front to the uneven surface,
The concavo-convex surface occupies 20% of the total area of the concavo-convex surface in plan view and a frame-shaped outer peripheral portion having a certain width from the outer periphery of the concavo-convex surface, and the concavo-convex surface surrounded by the outer peripheral portion in plan view Having a central portion that occupies the remaining 80% of the total area of
A reflection type screen in which the following formulas (1) and (2) are established in an arbitrary square range of 50 mm in length and 50 mm in width in the central portion.
Rc _ave / RSm _ave ≦ 0.64 (1)
Rc _ave ≧ 1 μm (2)
Rc _ave : 10-point average of average height Rc of roughness curve elements RSm _ave : 10-point average of average length RSm of roughness curve elements The reflective type according to claim 2, wherein the following formula (3) is established in addition to the formulas (1) and (2) in an arbitrary square range of 50 mm in length and 50 mm in the center. screen.
RSm _ave ≦ 15 μm (3) A transparent plate that transmits light of the image, a light-scattering layer that scatters light transmitted through the transparent plate, and light from the light-scattering layer toward the rear surface that is the opposite surface of the front surface from the front surface. It has a light reflecting layer that reflects toward the scattering layer in this order,
The reflective screen according to claim 2 or 3, wherein the light scattering layer is in close contact with the transparent plate, and the internal transmittance of the light scattering layer is 21 to 70%.   The reflective screen according to claim 1 or 4, wherein the light scattering layer has a haze value of 50% to 100%.   The reflective screen according to claim 1, wherein the light scattering layer has a thickness of 1 μm to 80 μm.   The reflective screen according to any one of claims 1 and 4 to 6, wherein the regular reflectance of the light reflecting layer is 40% or more.   The reflective screen according to any one of claims 1 and 4 to 7, wherein the transparent plate is a glass plate. On the opposite side of the light scattering layer with respect to the transparent plate, a coating layer covering at least a part of the transparent plate,
The reflective screen according to claim 1, wherein the uneven surface is formed on the coating layer.

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