JP2015200863A - Reflective screen, image display system, manufacturing method for reflective screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a reflective screen which effectively reflects incident image light and which can be easily manufactured; an image display system; and a manufacturing method for the reflective screen.SOLUTION: A reflective screen 20 comprises at least a base material layer 24 and lens layer 23 laminated together, and is used for reflectively displaying image light L projected by an image source LS thereon, where the lens layer 23 has a plurality of unit lenses 231 arrayed thereon, each unit lens 231 having a lens surface 232 and non-lens surface 233 and protruding from a base material 24 side toward a back face side. The lens surface 232 is at least partially covered with a reflective layer 22 for reflecting light made of a resin containing a plurality of scale-like metallic thin films 22a, each being arranged such that a plane normal to a thickness direction thereof is substantially parallel to the lens surface 232.

Description

  The present invention relates to a reflection screen that reflects projected image light and displays an image, an image display system, and a method for manufacturing the reflection screen.

  Conventionally, reflective screens having various configurations have been developed and used in video display systems. In recent years, short focus type video projection devices (projectors) that project a video light at a relatively large projection angle from a close distance to a reflective screen to realize a large screen display have been widely used. Reflective screens and the like have also been developed for satisfactorily displaying video light projected by a short focus type video projector.

The short focus type image projection apparatus can project image light at a larger projection angle than the conventional image source from above or below the reflection screen, and the distance in the depth direction between the image projection apparatus and the reflection screen. Therefore, it is possible to contribute to space saving of an image display system using a reflective screen.
Some reflective screens used in such video projection apparatuses are provided with a reflective layer in order to reflect more video light to the viewer side (for example, Patent Document 1).
In the reflection screen of Patent Document 1, a reflective layer is formed by vapor-depositing aluminum, and incident video light is efficiently reflected. However, since such a reflective screen forms a reflective layer using a vacuum vapor deposition apparatus etc., there existed a case where a process became complicated and manufacturing efficiency fell. In addition, such a reflective screen needs to be provided with a protective layer in order to prevent the reflective layer formed by vapor deposition from being oxidized and discolored, which increases the number of steps in manufacturing the reflective screen. In some cases, the production efficiency may decrease.

JP 2011-133608 A

  An object of the present invention is to provide a reflection screen, an image display system, and a method for manufacturing a reflection screen that can efficiently reflect incident image light and can be easily manufactured.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
According to the first aspect of the present invention, at least the base material layer (24) and the lens layer (23) are laminated, and the reflective screen (20) that reflects the video light (L) projected from the video source (LS) and displays it on the screen. The lens layer includes a lens surface (232) and a non-lens surface (233), and a plurality of unit lenses (231) that are convex from the base material layer side to the back surface side are arranged, and the lens At least part of the surface is formed of a resin containing a plurality of scaly metal thin films (22a), and includes a reflective layer (22) that reflects light, and the metal thin film is a surface perpendicular to the thickness direction. Is disposed substantially parallel to the lens surface.
According to a second aspect of the present invention, in the reflective screen according to the first aspect, the reflective layer has a thickness T in a direction perpendicular to the lens surface at a central portion (Q) of the lens surface in the arrangement direction of the unit lenses. The reflective screen is characterized by being formed in a range of 8 μm ≦ T ≦ 15 μm.
According to a third aspect of the present invention, in the reflective screen (20) according to the first or second aspect, the metal thin film (22a) of the reflective layer (22) has a vertical direction and a horizontal direction perpendicular to the thickness direction thereof. The reflective screen is characterized in that the average value of the dimensions is equal to the lens height dimension (h) of the unit lens (231).
According to a fourth aspect of the present invention, in the reflective screen (20) according to any one of the first to third aspects, the reflective layer (22) includes the lens surface (232) and the non-lens surface (233). ) Is formed so as to fill the boundary (v).
According to a fifth aspect of the present invention, in the reflective screen (20) of the fourth aspect, the reflective layer (22) is the lens layer (23) at a position (v) that is a valley bottom between the unit lenses (231). ) In the thickness direction is formed with a dimension in the range of 10 to 120% of the lens height (h) of each unit lens (231).
A sixth aspect of the present invention is the reflective screen (20) according to any one of the first to fifth aspects, wherein the resin forming the reflective layer (22) contains a dark color material. The reflective layer is a reflective screen characterized in that the dark-colored material is disposed at least partially between the metal thin films (22a).
A seventh aspect of the present invention is the reflective screen (20) according to the sixth aspect, wherein the dark-colored material of the reflective layer (22) is at least one of scaly pigments, fibrous pigments, and granular pigments. A reflective screen characterized in that it is composed of two.
The invention according to claim 8 is the reflective screen (20) according to claim 6 or 7, wherein the dark-colored material of the reflective layer (22) is 1 to 30% by weight with respect to the weight of the whole resin. It is contained in the range of this.
According to a ninth aspect of the present invention, in the reflective screen (20) according to any one of the first to eighth aspects, the reflective layer (22) is an average on the lens surfaces of the plurality of unit lenses. The reflective screen is characterized in that eight or more layers are laminated.

A tenth aspect of the present invention is a reflection screen (20) according to any one of the first to ninth aspects, and an image source (LS) that projects image light (L) onto the reflection screen. The video display system (1) is provided.
The invention of claim 11 is a method of manufacturing a reflective screen (20) for reflecting video light projected from a video source and displaying it on a screen, on the back side of the substrate (24), A lens layer forming step of forming a lens layer (23) having a lens surface (232) and a non-lens surface (233) and having a plurality of unit lenses (231) convex on the back side; and at least of the lens surfaces A reflective screen manufacturing method comprising: a reflective layer forming step of forming a reflective layer (22) that reflects light by applying a paint containing a plurality of scale-like metal thin films (22a) to a part thereof.

  According to the present invention, it is possible to provide a reflection screen, an image display system, and a method for manufacturing a reflection screen that can efficiently reflect incident image light and can be easily manufactured.

It is a figure explaining the video display system of an embodiment. It is a figure explaining the layer structure of the reflective screen of embodiment. It is a figure explaining the detail of the lens layer and reflection layer of embodiment. It is an enlarged photograph which shows the cross section of the reflection layer formed in the lens layer of embodiment. It is a photograph which shows the cross section of the reflection layer formed in the lens layer of embodiment. It is a figure explaining an example of the manufacturing method of the reflective screen of embodiment. It is a figure explaining the evaluation method of the reflective property of the light of the test body which has a reflection layer from which thickness differs. It is a figure which shows the relationship between the thickness T of the reflective layer of a test body, and a reflectance. It is a figure which shows the detail of the lens layer of a reflective screen of a deformation | transformation form, and a reflective layer.

Embodiments of the present invention will be described below with reference to the drawings.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
In addition, words such as plate and sheet are used, but these are generally used in the order of thickness, plate, sheet, and film in order of increasing thickness. I am using it. However, there is no technical meaning in such proper use, so these terms can be replaced as appropriate.
Furthermore, numerical values such as dimensions and material names of each member described in the present specification are examples of the embodiment, and the present invention is not limited thereto, and may be appropriately selected and used.

In this specification, terms that specify shape and geometric conditions, for example, terms such as parallel and orthogonal, are strictly meanings, have similar optical functions, and can be regarded as parallel and orthogonal It also includes a state having an error of.
In this specification, the sheet surface (plate surface, film surface) is the planar direction of the sheet (plate, film) when viewed as the entire sheet (plate, film) in each sheet (plate, film). It is assumed that the surface to be

(First embodiment)
FIG. 1 is a diagram illustrating a video display system 1 according to the present embodiment. FIG. 1A is a perspective view of the video display system 1, and FIG. 1B is a side view of the video display system 1.
The video display system 1 includes a reflective screen unit 10 including a reflective screen 20, a video source LS, and the like. In the video display system 1 of the present embodiment, the reflective screen 20 reflects the video light L projected from the video source LS, and displays the video on the screen.
The video display system 1 can be used as, for example, a front projection television system that projects video light L from a video source LS.

The video source LS is a video light projection device that projects the video light L onto the reflection screen 20. The video source LS of this embodiment is a general-purpose short focus projector. When the image source LS is in use and the screen of the reflection screen 20 is viewed from the normal direction (normal direction of the screen surface), the image source LS is the center in the horizontal direction of the screen of the reflection screen 20 and the image of the reflection screen 20 It is arranged at a position below the (display area).
The screen surface refers to a surface that is the planar direction of the reflective screen 20 when viewed as the entire reflective screen 20.
The video source LS can project the video light L from a position where the distance from the reflective screen 20 in a direction orthogonal to the screen of the reflective screen 20 (thickness direction of the reflective screen 20) is much closer than that of a conventional general-purpose projector. . That is, the image source LS has a shorter projection distance to the reflection screen 20 and a larger incident angle of the image light L with respect to the screen surface of the reflection screen 20 than a conventional general-purpose projector.

The reflection screen 20 is a screen that displays the image by reflecting the image light L projected by the image source LS toward the observer O side. In the use state, the observation screen of the reflection screen 20 has a substantially rectangular shape with the long side direction being the horizontal direction of the screen when viewed from the observer O side.
In the following description, the screen vertical direction, the screen horizontal direction, and the thickness direction are the screen vertical direction (vertical direction), the screen horizontal direction (horizontal direction), and thickness when the reflective screen 20 is used unless otherwise specified. The direction (depth direction) is assumed.
The reflective screen 20 has a large screen (display area) having a diagonal size of 100 inches or 120 inches, for example.

  The video display system 1 of the present embodiment includes a video source LS that is a short focus type projector, and a reflective screen 20 that displays video by reflecting video light projected from the video source LS. However, the present invention is not limited to this, and the image source LS is a conventional general-purpose projector having a long projection distance and a small image light projection angle (that is, an incident angle of the image light on the screen), and the reflection screen 20 is such a projector. It may correspond to the video source LS.

FIG. 2 is a diagram illustrating the layer configuration of the reflective screen 20 of the present embodiment.
In FIG. 2, it passes through a point A (see FIGS. 1A and 1B) that is the geometric center (center of the screen) of the observation screen (display area) of the reflection screen 20, and is parallel to the vertical direction of the screen. FIG. 2 shows an enlarged part of a cross section perpendicular to the screen surface (parallel to the thickness direction).
As shown in FIG. 1, the reflective screen unit 10 includes a reflective screen 20, a flat support plate 30 disposed on the back side thereof, and a bonding layer 40. The reflection screen 20 and the support plate 30 are integrally bonded via a bonding layer 40.

The support plate 30 is not particularly limited as long as it is a member having high rigidity. For example, a metal plate material such as aluminum or a resin plate material such as acrylic resin is preferably used. . In addition, a metal plate material (so-called honeycomb panel) that reduces the weight of the entire plate material by providing a honeycomb structure formed of a thin plate of aluminum or the like on the front and back surfaces and a thin plate of aluminum or the like as an inner core material. Etc. may be used. Moreover, it is preferable that the support plate 30 is a member which does not have a light transmittance from a viewpoint of preventing the reflection of external light, the contrast fall by external light, etc.
The thickness of the support plate 30 is preferably 0.2 to 5.0 mm, more preferably 1.0 to 3.0 mm. If the thickness is less than 0.2 mm, sufficient rigidity to support flatness is insufficient, and if the thickness is more than 5.0 mm, the weight of the support plate 30 becomes heavy.
In many cases, the reflective screen 20 is thin and does not have sufficient rigidity to maintain flatness by itself. For this reason, the reflection screen 20 maintains the flatness of the screen by being integrally joined to the support plate 30.

  The bonding layer 40 is a layer having a function of bonding the reflective screen 20 and the support plate 30 together. The bonding layer 40 is formed of a pressure sensitive adhesive, an adhesive, or the like.

As shown in FIG. 2, the reflective screen 20 includes a surface layer 25, a base material layer 24, a lens layer 23, and a reflective layer 22 in order from the image source side (observer side) in the thickness direction.
The base material layer 24 is a sheet-like member serving as a base material for forming the lens layer 23. A surface layer 25 is integrally formed on the image source side of the base material layer 24, and a lens layer 23 is integrally formed on the back side (back side).
The base material layer 24 has a light diffusing layer 241 containing a diffusing material and a colored layer 242 containing a coloring material such as a pigment or a dye. The base material layer 24 of this embodiment is formed by integrally laminating a light diffusion layer 241 and a colored layer 242 by coextrusion molding.
In the present embodiment, as shown in FIG. 2, in the base material layer 24, the light diffusion layer 241 is on the back side and the coloring layer 242 is positioned on the image source side. The diffusion layer 241 may be positioned on the video source side and the colored layer 242 may be positioned on the back side.

The light diffusion layer 241 is a layer that contains a light transmissive resin as a base material and contains a light diffusing material. The light diffusion layer 241 has a function of widening the viewing angle and improving the in-plane uniformity of brightness.
Examples of the resin used as the base material of the light diffusion layer 241 include PET (polyethylene terephthalate) resin, PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, MBS (methyl methacrylate / butadiene / styrene) resin, and TAC ( Triacetyl cellulose) resin, PEN (polyethylene naphthalate) resin, acrylic resin and the like are preferably used.

As the diffusing material contained in the light diffusion layer 241, particles made of resin such as acrylic resin, epoxy resin, or silicon resin, inorganic particles, and the like are preferably used. Note that the diffusion material may be a combination of an inorganic diffusion material and an organic diffusion material. This diffusing material is preferably substantially spherical and has an average particle diameter of about 1 to 50 μm. Moreover, it is preferable that the range of the particle size of the diffusing material suitable for use is 5 to 30 μm.
The thickness of the light diffusion layer 241 is preferably about 100 to 2000 μm, although it depends on the screen size of the reflection screen 20 and the like. The light diffusion layer 241 preferably has a haze value in the range of 85 to 99%.

The colored layer 242 is a layer colored with a dark colorant such as black so as to have a predetermined light transmittance. The colored layer 242 has a function of improving the contrast of an image by absorbing unnecessary external light such as illumination light incident on the reflective screen 20 and reducing the black luminance of the displayed image.
As the colorant of the colored layer 242, a dark dye such as gray or black, a pigment, a metal salt such as carbon black, graphite, black iron oxide, or the like is preferably used.
As a resin which is a base material of the coloring layer 242, a PET resin, a PC resin, an MS resin, an MBS resin, a TAC resin, a PEN resin, an acrylic resin, or the like can be used.
The colored layer 242 preferably has a thickness of about 30 to 1000 μm, although it depends on the screen size of the reflective screen 20 and the like.

FIG. 3 is a diagram illustrating details of the lens layer 23 and the reflective layer 22 of the present embodiment.
FIG. 3A shows a state in which the lens layer 23 is observed from the front side on the back side, and the reflection layer 22 is omitted for easy understanding. FIG. 3B shows an enlarged part of the cross section shown in FIG. FIG. 3C shows an enlarged perspective view of the lens layer on which the reflective layer is formed. In FIG. 3B and FIG. 3C, the base material layer 24 and the surface layer 25 located on the image source side of the lens layer 23 are omitted for easy understanding.

The lens layer 23 is a light-transmitting layer provided on the back side of the base material layer 24, and a plurality of unit lenses 231 are arranged concentrically around the point C as shown in FIG. The circular Fresnel lens shape is provided on the back side surface. In this circular Fresnel lens shape, the point C which is the optical center (Fresnel center) is outside the area of the screen (display area) of the reflective screen 20 and is located below the reflective screen 20.
In the present embodiment, the lens layer 23 will be described by taking an example in which a circular Fresnel lens shape is provided on the surface on the back side. However, the present invention is not limited to this, and the unit lenses 231 are arranged in the screen vertical direction along the screen surface. It is good also as a form which has the made linear Fresnel lens shape.

2 and 3B, the unit lens 231 is parallel to the direction orthogonal to the screen surface (thickness direction of the reflection screen 20) and is a cross section in a cross section parallel to the arrangement direction of the unit lenses 231. The shape is a substantially triangular shape.
The unit lens 231 is convex on the back side, and includes a lens surface 232 and a non-lens surface 233 that faces the lens surface 232.
In the present embodiment, in the usage state of the reflection screen 20, the unit lens 231 has the lens surface 232 positioned above the non-lens surface 233 across the vertex t.

As shown in FIG. 3B, the angle formed by the lens surface 232 of the unit lens 231 with a surface parallel to the screen surface is α. Further, the angle formed by the non-lens surface 233 and the surface parallel to the screen surface is β (β> α). Furthermore, the arrangement pitch of the unit lenses 231 is P, and the lens height of the unit lenses 231 (the dimension from the apex t in the thickness direction of the screen to the point v that becomes the valley bottom between the unit lenses 231) is h.
In order to facilitate understanding, in FIG. 2 and the like, the arrangement pitch P and the angles α and β of the unit lenses 231 are shown to be constant in the arrangement direction of the unit lenses 231. However, the unit lenses 231 according to the present embodiment have a constant arrangement pitch P or the like, but gradually become larger as the angle α becomes farther from the point C that becomes the Fresnel center in the arrangement direction of the unit lenses 231. Accordingly, the lens height h also fluctuates. The unit lenses 231 of the present embodiment are formed so that the arrangement pitch P is in the range of 50 to 200 μm, the lens height h is in the range of 0.5 to 60 μm, and the angle α of the lens surface 232 is 0.5 to. The angle β of the non-lens surface 233 is formed in the range of 45 to 90 °.
The arrangement pitch P is not limited to this, and the arrangement pitch P may be changed gradually along the arrangement direction of the unit lenses 231. The size of the pixel of the video source LS that projects the video light L, the video source, and the like The LS projection angle (the incident angle of the image light on the screen surface of the reflection screen 20), the screen size of the reflection screen 20, the refractive index of each layer, and the like can be changed as appropriate.

The lens layer 23 is integrally formed on the back side surface of the base material layer 24 (in this embodiment, the light diffusion layer 241 side) by an ultraviolet curable resin such as urethane acrylate or epoxy acrylate. The lens layer 23 may be formed of another ionizing radiation curable resin such as an electron beam curable resin.
The lens layer 23 may use a thermoplastic resin, or may be formed by a press molding method or the like according to the Fresnel lens shape of the lens layer 23. In the case of such a lens layer 23, the base material layer 24 (light diffusion layer 241) or the like may be laminated on the image source side via a bonding layer (not shown) or the like. In addition, when an extrusion molding method is possible, the lens layer 23 and the base material layer 24 may be molded in an integrally laminated state.

FIG. 4 is an enlarged photograph showing a cross section of the reflective layer formed on the lens layer of the present embodiment.
FIG. 5 is a photograph showing a cross section of the reflective layer formed on the lens layer of the present embodiment.
The reflection layer 22 is a layer having an action of reflecting light. The reflection layer 22 has a sufficient thickness for reflecting light, and is formed on at least a part of the lens surface 232 of the unit lens 231.
The reflection layer 22 of this embodiment is formed on the lens surface 232 and the non-lens surface 233 as shown in FIG. 2 and FIG. Specifically, the reflection layer 22 covers the back side of the lens layer 23 and is formed so as to fill a boundary between the unit lenses 231 that are convex on the back side, that is, a point v that becomes a valley bottom. Thereby, the reflective layer 22 can make the unevenness | corrugation of the back side of a lens layer substantially flat, and can stick the support plate 30 more stably via the joining layer 40. FIG.
FIG. 4 is a cross-sectional view at a position 1100 mm from the point C serving as the Fresnel center. The reflection layer 22 shown in this figure has a valley bottom between the unit lenses 231 with respect to the lens height h = 20 μm of the unit lens 231. The thickness in the thickness direction of the lens layer 23 at the point v is 24 μm, and the support plate 30 can be stably attached to the back side of the reflective layer 22.
Here, as described above, the lens height h of the unit lenses 231 varies as the distance from the point C that becomes the Fresnel center in the arrangement direction of the unit lenses 231, but at the point v that becomes the valley bottom between the unit lenses 231. The thickness of the reflective layer 22 in the thickness direction of the lens layer 23 is formed with a dimension within a range of 10 to 120% with respect to the lens height h of each unit lens 231 in order to achieve the above-described effect more effectively. It is preferable.

The reflective layer 22 is formed by spray coating the lens surface 232 with a paint (resin) containing a scaly metal thin film 22 a having high light reflectivity such as aluminum on the lens surface 232. As shown in FIGS. 4 and 5, the reflective layer 22 has a surface perpendicular to the thickness direction of the scaly metal thin film 22 a disposed substantially parallel to the lens surface 232, and is incident on the lens surface 232. The image light L can be appropriately reflected toward the viewer side. Here, “substantially parallel” means not only the case where the surface perpendicular to the thickness direction of the metal thin film 22a is completely parallel to the lens surface 232, but also the inclination with respect to the lens surface 232 is in the range of −10 ° to + 10 °. It includes things that include some cases. Further, the scale-like metal thin film 22a means that the shape (outer shape) viewed from the thickness direction of the metal thin film 22a is a scale-like shape. The scale-like shape is not only a scale-like shape but also an elliptical shape or , Including a circular shape, a polygonal shape, and an irregular shape obtained by pulverizing a thin film.
Here, as the property classification of the scale-like metal thin film, there are a leafing type, a non-leafing type, a resin coating type, etc., which are each characterized by metallic luster, concealment, adhesion, orientation, etc. For example, a metallic luster is important, but a resin coating type is preferable in consideration of adhesion, orientation, and the like.

The metal thin film 22a maintains and improves the reflection efficiency of the image light, and prevents the back side of the reflective layer 22 from being seen through, so that an average of eight or more layers on the entire lens surface of each of the plurality of unit lenses, It is desirable to be laminated. The reflective layer 22 provided with eight or more metal thin films 22 a described above may be provided on some lens surfaces 232 of the lens surfaces 232 of the plurality of unit lenses 231, or all the lens surfaces 232. May be provided.
Here, since the reflection layer 22 shown in FIGS. 4 and 5 has a regular reflectance Rt of 57.8% and a diffuse reflectance Rd of 43.9%, the incident image light is efficiently transmitted to the observer side. Can be reflected. The reflective layer 22 has a regular reflectance Rt of 50% <Rt <70% and a diffuse reflectance Rd of 10% <Rd <50% in order to efficiently reflect incident video light. desirable.

The coating material forming the reflective layer 22 is composed of a scale-like metal thin film 22a, a binder, a drying aid, a control agent, and the like. This paint preferably has a viscosity in the range of 50 to 1000 [cp] (measurement temperature 23 degrees) from the viewpoint of easy application with a spray gun.
This metal thin film 22a is aluminum formed in a scale shape, and the thickness dimension thereof is formed in the range of 15 to 150 nm, more preferably in the range of 20 to 80 nm. In addition, the metal thin film 22a has an average value of dimensions in the vertical and horizontal directions orthogonal to the thickness direction (hereinafter referred to as vertical and horizontal dimensions) equal to the lens height h of the unit lens 231, that is, 0. It is preferably formed to 35 to 78 μm. Here, the equivalent to the lens height h is not only the case where the vertical and horizontal dimensions of the metal thin film are equal to the lens height h, but also the case where it approximates the lens height h (for example, with respect to the lens height h). -30% to + 30% size range).

Here, if the metal thin film 22a is disposed substantially parallel to the non-lens surface 233, when the external light is incident on the non-lens surface 233, the external light is reflected by the non-lens surface 233 and the observer side. May result in a decrease in the contrast of the video. Therefore, by making the vertical dimension and the horizontal dimension of the metal thin film 22a equal to the lens height h as described above, when the paint is applied to the back side of the lens layer 23, the metal thin film 22a becomes non-lens. It can suppress arrange | positioning substantially parallel with respect to the surface 233. FIG. Thereby, even if external light injects into the non-lens surface 233, the reflection layer 22 can be diffused in the edge part of a metal thin film, and can suppress as much as possible that it reflects in an observer side.
The metal thin film 22a is preferably contained within a range of 3 to 15% by weight with respect to the weight of the entire coating material from the viewpoint of ensuring the light reflecting function as the reflecting layer.

The binder is a transparent bonding agent composed of a thermosetting resin, and is a base material that forms the reflective layer 22. In the present embodiment, the binder uses a urethane-based thermosetting resin, but the binder is not limited to this, and an epoxy-based thermosetting resin may be used, or an ultraviolet curable resin or the like may be used. May be. The binder may be used as a two-component curable type by adding a curing agent. If it is a urethane resin, polyisocyanate or the like can be used, and if it is an epoxy resin, amines or the like can be used. Can be used.
The drying aid is a solvent that adjusts the drying time of the paint applied to the lens layer to a predetermined time, and is a so-called slow drying solvent. In the present embodiment, a predetermined amount of the drying aid is included in the coating so that the time until drying of the coating applied to the back side of the lens layer 23 is approximately one hour. As the drying aid, for example, a mixed solvent of propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether, diisobutyl ketone, and 3-methoxy-1-butyl acetate can be used.
The control agent is a solvent that controls the orientation of the metal thin film 22a contained in the paint. When the control agent is contained in the paint, the metal thin film 22 a can be disposed substantially parallel to the lens surface 232. As the control agent, for example, silica, alumina, aluminum hydroxide, acrylic oligomer, silicone or the like can be used.

As shown in FIG. 5, the reflective layer 22 has a lens surface 232 in the arrangement direction of the unit lenses 231 from the viewpoint of ensuring the light reflection characteristics and maintaining the appearance of the back side of the reflective screen 20. It is desirable that the thickness T (film thickness) in the direction perpendicular to the lens surface 232 in the central portion Q is in the range of 8 μm ≦ T ≦ 15 μm.
If the thickness T of the reflective layer 22 is less than 8 μm, the reflectivity of the reflective layer 22 may be reduced, and the image light may not be sufficiently reflected. In the reflective layer 22 exposed to the side, there are portions where the coating film is present and portions where the coating film is not present, and there is a possibility that unevenness or blurring may occur in the appearance and the appearance on the back side of the reflective screen 20 may be impaired. .
Further, when the thickness T of the reflective layer 22 is larger than 15 μm, a part of the metal thin film 22a included in the reflective layer 22 is not arranged substantially parallel to the lens surface and is partially perpendicular to the lens surface. And the appearance of the back side of the reflective layer 22 is uneven, and the appearance of the back side of the reflective screen 20 may be impaired.

The surface layer 25 is a layer provided on the image source side (observer side) of the base material layer 24. The surface layer 25 of the present embodiment forms the outermost surface of the reflection screen 20 on the image source side.
The surface layer 25 of the present embodiment has a hard coat function and an antiglare function, and an ultraviolet curable resin (for example, urethane acrylate) having a hard coat function is provided on the surface of the base layer 24 on the image source side. The ionizing radiation curable resin is applied so that the film thickness of the coating film is about 10 to 100 μm, and the fine uneven shape (mat shape) is cured by transferring it to the surface of the resin film. Is shaped and formed.

The surface layer 25 is not limited to the above example, and one or more necessary functions such as an antireflection function, an antiglare function, a hard coat function, an ultraviolet absorption function, an antifouling function, and an antistatic function are appropriately selected. Can be provided. Further, a touch panel layer or the like may be provided as the surface layer 25.
Further, as the surface layer 25, a layer having an antireflection function, an ultraviolet absorption function, an antifouling function, an antistatic function, or the like may be provided as a separate layer between the surface layer 25 and the base material layer 24.
Further, the surface layer 25 is a layer separate from the base material layer 24 and may be bonded to the base material layer 24 by an adhesive material (not shown) or the like, and is opposite to the lens layer 23 of the base material layer 24. It may be formed directly on the side (video source side) surface.

Returning to FIG. 2, the state of the image light and the external light incident on the reflection screen 20 of this embodiment will be described. In FIG. 2, the refractive index of the surface layer 25, the colored layer 242, the light diffusing layer 241, and the lens layer 23 is assumed to be equal to facilitate understanding, and the light of the light diffusing layer 241 with respect to the image light L1 and the external light G The diffusion action and the like are omitted.
As shown in FIG. 2, most of the image light L <b> 1 projected from the image source LS enters from below the reflection screen 20, passes through the surface layer 25 and the base material layer 24, and is a unit lens 231 of the lens layer 23. Incident to

Then, the image light L1 enters the lens surface 232, is reflected by the reflective layer 22, travels toward the observer O, and exits from the reflective screen 20 in a substantially front direction. Therefore, since the image light L1 is efficiently reflected and reaches the observer O, a bright image can be displayed.
Since the image light L1 is projected from below the reflection screen 20, and the angle β (see FIG. 3B) is larger than the incident angle of the image light L1 at each point in the screen vertical direction of the reflection screen 20, The image light L1 does not directly enter the non-lens surface 233, and the non-lens surface 233 does not affect the reflection of the image light L1.

On the other hand, unnecessary external light G (G 1, G 2) such as illumination light is incident mainly from above the reflection screen 20 and passes through the surface layer 25 and the base material layer 24 as shown in FIG. Is incident on the unit lens 231.
A part of the external light G1 enters the non-lens surface 233, but is diffused at the end of the metal thin film 22a of the reflective layer 22 formed on the back side of the non-lens surface 233 and reaches the observer O side. Even so, the amount of light is much smaller than that of the image light L1. Further, a part of the external light G2 is reflected by the lens surface 232 and mainly travels to the lower side of the reflection screen 20, so that it does not reach the observer O side directly. Significantly less than the image light L1. Further, a part of the external light enters the reflective screen 20 and is absorbed by the colored layer 242. Therefore, the reflective screen 20 can suppress a decrease in the contrast of the image due to the external light G1, G2, and the like.
From the above, according to the reflective screen 20 of the present embodiment, a bright and good image can be displayed even in a bright room environment.

Here, an example of the manufacturing method of the reflective screen 20 of this embodiment is demonstrated.
FIG. 6 is a diagram for explaining an example of the manufacturing method of the reflective screen 20 of the present embodiment.
As shown in FIG. 6A, the light diffusing layer 241 and the colored layer 242 are integrally formed by coextruding a resin containing a diffusing material and a resin containing a coloring material with a predetermined thickness, respectively. The base layer 24 is formed by molding. Here, it is assumed that the base material layer 24 has a web shape.

Next, as shown in FIG. 6B, an ultraviolet curable resin such as urethane acrylate is applied on the surface of the base material layer 24 on the image source side (in this embodiment, the surface on the colored layer 242 side). Then, a fine uneven shape (mat shape) is cured by transferring it to the surface of the resin film to form a surface layer 25 having a fine uneven shape on the surface. In the present embodiment, the surface layer 25 has a surface roughness in the range of 0.1 to 3 μm and a haze value in the range of 5 to 20%.
Note that a masking material (not shown) may be detachably bonded onto the surface layer 25 and may be flowed to the next step. As the masking material, for example, a transparent or substantially transparent sheet-like member can be used, and has a function of preventing the surface layer 25 from being stained or damaged in the subsequent manufacturing process.

Next, the surface layer 25 and the base material layer 24 are cut into a predetermined size to form a single wafer.
Then, as shown in FIG. 6C, the lens layer 23 is formed on the surface on the back side of the base material layer 24 (in this embodiment, the surface on the light diffusion layer 241 side) by an ultraviolet molding method or the like. (Lens layer forming step).
The lens layer 23 is filled with an acrylic ultraviolet curable resin on the surface opposite to the surface on which the surface layer 25 of the base material layer 24 is laminated (the surface on the light diffusion layer 241 side in this embodiment). The circular Fresnel lens is formed by, for example, pressing it against a mold for shaping the shape, irradiating it with ultraviolet rays and curing it, and then releasing it from the mold. The method for forming the lens layer 23 may be selected as appropriate, and is not limited to this.

Next, as shown in FIG. 6D, the reflective layer 22 is formed by spraying a coating material (resin) containing the scaly metal thin film 22a on the back side of the lens layer 23 with a spray gun (not shown). . Application of the paint is performed by moving the spray gun from the lower end portion in the vertical direction of the screen to the upper end side at a predetermined movement pitch (for example, 70 mm pitch) while moving the lens layer 23 in the horizontal direction of the screen (reflection). Layer forming step). At this time, the direction of the spray gun is preferably substantially perpendicular to the lens surface 232 in order to facilitate the arrangement of the metal thin film 22 a substantially parallel to the lens surface 232.
Next, the reflective screen 20 is completed by peeling the masking material or the like from the surface layer 25 or performing a subsequent process such as a further cutting process.
In the above description, the reflective layer forming step has shown an example in which the reflective layer 22 is formed by applying a paint containing the scale-like metal thin film 22a with a spray gun. However, the present invention is not limited to this. Not. For example, the reflective layer 22 may be formed by a so-called roll coater method in which a rotating roll coated with a paint is pressed against a substrate (lens layer) and applied.

Here, the reflection layer provided on the lens layer of a reflection screen (hereinafter referred to as a reflection screen of a comparative example) that has been mainly manufactured heretofore has been formed by a vacuum evaporation method in which a metal such as aluminum is evaporated. The reflective layer formed by this vapor deposition can reflect image light efficiently, but the thickness is very thin (for example, about 800 mm), so that the back side of the reflective screen can be prevented from being seen through or reflected. In order to suppress the oxidation of the layer, it was necessary to provide a protective layer on the back side of the reflective layer.
Therefore, in the reflective screen of the comparative example, it was necessary to provide a vapor deposition processing step and a protective layer forming step for forming the reflective layer.

On the other hand, the reflective screen 20 of the present embodiment is manufactured by a vacuum deposition method because the plurality of scale-like metal thin films 22a contained in the coating material are arranged substantially parallel to the lens surface 232. Compared to the reflective screen of the comparative example, the reflective screen 20 can be manufactured efficiently and simply. That is, the reflective layer of the reflective screen of the above comparative example uses a vacuum deposition apparatus or the like to deposit the deposited metal after the lens layer is placed in a vacuum environment. Although time and complicated work are required, since the reflective layer 22 of the reflective screen 20 of the present embodiment is coated with a paint containing the metal thin film 22a, the time required for forming the lens layer is shortened. The necessary work can be made easier.
Moreover, since the reflective screen 22 of the present embodiment is formed so that the reflective layer 22 covers the back side of the unit lens 231, there is no need to provide a protective layer unlike the reflective screen of the comparative example. In this respect, it can be easily manufactured as compared with the reflective screen of the comparative example. Moreover, the manufacturing cost of the reflective screen 20 can also be reduced.

  Furthermore, since the reflective screen of the comparative example has a reflective layer formed by vapor deposition, the reflective screen as a whole has a yellowish color. However, the reflective screen 20 of this embodiment has a reflective layer 22 having a plurality of scale pieces. Since it is formed of a metal thin film, it has a bluish color as a whole. Here, when adjusting the color of the image light projected from the image source to adjust the color of the image displayed on the reflective screen, when the reflective screen is more bluish than when it is yellowish The correction to white becomes easier. Therefore, the reflective screen 20 of the present embodiment can easily perform color correction by adjusting the video source, as compared with the reflective screen of the comparative example.

Next, the change in the light reflection characteristics of the reflection layer when the thickness T of the reflection layer is changed is evaluated.
FIG. 7 is a diagram for explaining a method for evaluating light reflection characteristics of a test specimen having reflective layers having different thicknesses.
The reflection characteristics of the reflection layer were evaluated by preparing a plurality of test bodies 100 having reflection layers having different thicknesses T and measuring the absolute reflectance of each test body.
As shown in FIG. 7, the test body 100 has a reflective layer 102 formed on a base material 101 by spray coating.
The substrate 101 is a polycarbonate transparent resin plate having an outer shape of 50 mm × 50 mm and a thickness of 1 mm, and is a member that simulates the lens layer 23 of the reflective screen.

The reflective layer 102 is a layer formed on the surface of the substrate 101 and having light reflection characteristics. The reflective layer 102 simulates the reflective layer 22 of the reflective screen 20 described above, and is formed by spray-coating a paint containing a scaly metal thin film similar to the reflective layer described above on the surface of the substrate 101. Is done.
The thickness T of the reflective layer 102 of the test body 100 indicates the average value of the maximum value and the minimum value of the thickness of the reflective layer 102 in the direction perpendicular to the surface of the substrate 101.
In this evaluation test, the thickness T of the reflective layer 102 of each specimen 100 is T = 8.0 μm, T = 8.7 μm, T = 9.0 μm, T = 9.8 μm, and T = 10.2 μm, respectively. is there.
For the measurement of the reflectance, a reflectance measuring device (manufactured by Murakami Color Research Laboratory, HR-100) was used, and the total reflectance was measured.

FIG. 8 is a diagram showing the relationship between the thickness T of the reflective layer of the test specimen and the reflectance.
The vertical axis in FIG. 8 represents the reflectance [%] of the reflective layer 102, and the horizontal axis represents the thickness T of the reflective layer 102. Here, the measured reflectance is the total light reflectance (Rt), and indicates the ratio of the total reflected light beam to the parallel incident light beam of the test piece.
As shown in FIG. 8, when the thickness T of the reflective layer 102 is 8 μm or more, the reflectance of the reflective layer 102 is 54% or more, and it was confirmed that the light has good light reflection characteristics.

As described above, the reflective screen of the present embodiment has the following effects.
(1) Since the reflective screen 20 has a surface perpendicular to the thickness direction of the plurality of scaly metal thin films 22 a contained in the resin forming the reflective layer 22 disposed substantially parallel to the lens surface 232, The image light can be appropriately reflected to the viewer side. Even if the reflective layer 22 is formed on the non-lens surface 233, the external light G incident on the non-lens surface 233 can be diffused at the end of the thickness of the metal thin film 22a. It can suppress that it reflects in the side.
Furthermore, since the reflective layer 22 is formed by applying a resin (paint) containing the metal thin film 22a, as compared with the reflective screen of the above-described comparative example manufactured using a vacuum deposition apparatus or the like, The reflective screen 20 can be manufactured efficiently and simply.
(2) In the reflective screen 20, the reflective layer 22 is formed of a paint containing a plurality of scale-like metal thin films, and is perpendicular to the lens surface 232 at the central portion Q of the lens surface 232 in the arrangement direction of the unit lenses 231. The thickness T in the direction is formed in the range of 8 μm ≦ T ≦ 15 μm. Thereby, the reflective screen 20 can manufacture the reflective layer 22 easily, and can ensure the light reflection characteristic of the reflective layer 22 satisfactorily. Moreover, it is possible to suppress the formation of unevenness and blurring on the back side of the reflective layer 22 and to improve the appearance of the back side of the reflective screen 20.
(3) Since the reflection screen 20 is formed such that the vertical dimension and the horizontal dimension of the metal thin film 22a of the reflection layer 22 are equal to the lens height dimension h of the unit lens 231, the image incident on the lens surface 232 The light L can be appropriately reflected to the viewer side, and when the paint is applied to the back side of the lens layer 23, the metal thin film 22a is disposed substantially parallel to the non-lens surface 233. Can be suppressed.
(4) Since the reflective screen 20 is formed so that the reflective layer 22 covers the back side of the unit lens 231, it is not necessary to provide a protective layer unlike the reflective screen of the comparative example. Compared to the reflective screen of the comparative example that requires the above, it can be easily manufactured. Moreover, the manufacturing cost of the reflective screen 20 can also be reduced.
(5) Since the reflective screen 20 has eight or more layers of the metal thin film 22a of the reflective layer 22 with respect to the lens surface 232, the reflective efficiency of the image light can be maintained and improved, and the reflective layer 22 can be maintained. It is possible to prevent the rear side of the screen from being seen through.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
In the following description, parts that perform the same functions as those of the first embodiment described above are given the same reference numerals or the same reference numerals at the end, and redundant descriptions are omitted as appropriate.
The reflective screen of the second embodiment has the same layer structure as the reflective screen of the first embodiment described above, but the first pigment described above in that the paint forming the reflective layer further contains a dark pigment. It is different from the embodiment.

The paint forming the reflective layer 22 is composed of a scale-like metal thin film 22a, a binder, a drying aid, a control agent, a dark color material, and the like. In addition, the scale-like metal thin film 22a, the binder, the drying aid, and the control agent constituting the paint are the same as those in the first embodiment.
The dark-colored material contained in the coating material forming the reflective layer 22 is a pigment that colors the base material (binder) forming the reflective layer 22 to a dark color (gray, black, etc.). For example, carbon black (carbon particles), Fibrous carbon, scale-like carbon, and the like can be used. The dark-colored material can absorb light incident between the metal thin films 22a among the light incident on the reflective layer 22 by coloring the base material of the reflective layer 22 in a dark color.

Therefore, it is desirable that the dark color material is contained within a range of 1 to 30% by weight with respect to the weight of the entire paint from the viewpoint of achieving both the above-described light reflection function and light absorption function. If the weight ratio is less than 1%, the amount of the dark color material is too small with respect to the entire reflective layer 22, and the above-described light absorption effect cannot be sufficiently achieved. On the other hand, when the weight ratio is larger than 30%, the amount of the dark color material with respect to the base material (binder) of the reflective layer 22 is excessively increased, and the light reflecting function of the reflective layer 22 is deteriorated.
Further, the dark color material is further contained within a range of 10 to 30% by weight with respect to the weight of the whole paint from the viewpoint of sufficiently obtaining the light absorption effect and sufficiently obtaining the light reflection function. desirable.

In addition, the dark material preferably has a particle size of less than 1 μm if the average size is in the form of particles, and if it is fibrous, the diameter is less than 0.5 μm and the length is less than 3 μm. In the case of a scaly shape, the thickness is preferably less than 0.15 μm, and the dimensions in the vertical and horizontal directions orthogonal to the thickness direction are preferably less than 10 μm.
When the dark color material has a shape larger than the above dimensions, the dark color material blocks light reflection by the metal thin film 22a and reduces the reflection efficiency of the reflection layer 22, or the dark color material is sufficiently contained in the binder. You may not be able to mix it with.

Next, the state of external light incident on the reflection screen 20 of this embodiment will be described.
As shown in FIG. 2, unnecessary external light G (G1, G2) such as illumination light is incident mainly from above the reflection screen 20, passes through the surface layer 25 and the base material layer 24, and is a unit of the lens layer 23. The light enters the lens 231.
Then, a part of the external light G1 enters the non-lens surface 233, and a part of the external light G1 is diffused at the end of the metal thin film 22a of the reflective layer 22 formed on the back side of the non-lens surface 233. Even if it reaches the O side, the amount of light is much smaller than that of the image light L1. In addition, some external light incident on the non-lens surface 233 is incident on the base material (binder) that forms the reflective layer 22 between the metal thin films 22a. As described above, the base material is made of a dark color material. Since it is contained, the light is absorbed without being reflected.

From the above, the reflective screen 20 of the present embodiment can display a bright and good image with high contrast even in a bright room environment, like the reflective screen of the first embodiment. In addition, since the dark material is contained in the base material (binder) forming the reflective layer, the black color of the image can be made clearer and the contrast of the image can be improved.
In addition, the reflective screen of the comparative example described above may form a reflective layer on the non-lens surface, in which case unnecessary external light such as illumination light is incident on the non-lens surface and the lens surface. May be reflected to the viewer and reach the viewer, which may hinder the display of a good image. In contrast, in the reflective screen 20 of the second embodiment, the reflective layer 22 is also formed on the non-lens surface 233, but the base material (binder) forming the reflective layer 22 contains a dark color material. Therefore, reflection of external light incident on the non-lens surface 233 can be significantly reduced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as in the modifications described later, and these are also included in the present invention. Within the technical scope. In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. It should be noted that the above-described embodiment and modifications described later can be used in appropriate combination, but detailed description thereof is omitted.

(Deformation)
FIG. 9 is a diagram illustrating details of the lens layer and the reflective layer of the reflective screen according to the modified embodiment, and corresponds to FIG.

(1) In the above-described embodiment, an example in which the reflective screen 20 is formed so that the reflective layer 22 covers the lens surface 232 and the non-lens surface 233 of the unit lens 231 has been described. Not a thing. For example, as shown in FIG. 9, the reflection layer 22 is a part of the lens surface 232 and contributes only to the non-lens surface 233 side of the adjacent unit lens 231, that is, to the reflection of the image light on the lens surface 232. You may make it provide only in the part to perform. In this case, since the reflective layer 22 is not formed on part of the lens surface 232 and the non-lens surface 233, it is necessary to provide a concealing layer (protective layer) that conceals the back side of the reflective layer 22.
(2) Although the metal thin film 22a of the reflective layer 22 of the above-mentioned embodiment demonstrated the example which uses scale-like aluminum, it is not limited to this, For example, metals, such as silver and nickel, are used. It is also possible to do.
(3) In order to maintain the flatness of the screen, the reflective screen 20 of the above-described embodiment may be made of glass or resin, and may include a highly rigid transparent substrate layer.

(4) In the above-described embodiment, the lens surface 232 and the non-lens surface 233 are planar as shown in FIG. 2 and the like, but the present invention is not limited to this. A part of the lens surface 233 may be curved.
In the present embodiment, the lens surface 232 and the non-lens surface 233 of the unit lens 231 are both examples. However, the present invention is not limited to this. For example, at least one surface includes a plurality of surfaces. It is good also as a form comprised from.
Furthermore, in the present embodiment, the unit lens 231 has an example in which the cross-sectional shape illustrated in FIG. 2 or the like is a substantially triangular shape. However, the present invention is not limited thereto, and for example, the cross-sectional shape is a substantially trapezoidal shape. The non-lens surface may be opposed to the screen surface across a top surface parallel to the screen surface. At this time, the top surface is preferably formed in a region that does not contribute to the reflection of the image light. A reflective layer may be formed on the top surface, or the top surface may be covered with a protective layer.

(5) In the above-described embodiment, the base material layer 24 includes the colored layer 242 and the light diffusion layer 241. However, the present invention is not limited thereto. For example, the base material layer 24 includes the colored layer 242. Instead, the light diffusing layer 241 alone may be provided. In this case, the light diffusion layer 241 may further include a coloring material in addition to the diffusion material.
Moreover, the base material layer 24 is provided with the colored layer 242 and the light-diffusion layer 241, and the colored layer 242 is good also as a form which contains a light-diffusion material in addition to a coloring agent.
Furthermore, the light diffusing layer 241 and the colored layer 242 may be formed as a base material layer 24 by bonding the light diffusing layer 241 and the colored layer 242 that are separately formed with an adhesive or the like.

(6) In the above-described embodiment, the video source LS is positioned below the reflective screen 20 (the reflective screen unit 10) in the vertical direction, and the video light L is projected obliquely from below the reflective screen 20. However, the present invention is not limited to this. For example, the video source LS may be positioned above the reflective screen 20 in the vertical direction, and the video light L may be projected obliquely from above the reflective screen 20.

(7) In the second embodiment, the example in which the reflective screen uses carbon for the dark color material of the reflective layer has been described. However, the present invention is not limited to this, and graphite, metal salts such as black iron oxide, etc. May be used. Further, the dark color material is not limited to a particulate shape, a fiber shape, and a scale shape, and may have other shapes.
(8) In the second embodiment, an example of using a dark color pigment as the dark color material has been described. However, the present invention is not limited to this. For example, a dark color dye may be used. For example, a nigrosine-based black dye (azine-based dye) or an aniline-based black dye can be used.

  In addition, although the above-mentioned embodiment and modification can also be used in combination suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited by the above-described embodiments and the like.

DESCRIPTION OF SYMBOLS 1 Image display system 10 Reflective screen unit 20 Reflective screen 22 Reflective layer 22a Metal thin film 23 Lens layer 231 Unit lens 232 Lens surface 233 Non-lens surface 24 Base material layer 25 Surface layer 30 Support plate 40 Bonding layer LS Image source

Claims (11)

A reflection screen that laminates at least a base material layer and a lens layer and reflects image light projected from an image source to display on a screen;
The lens layer includes a lens surface and a non-lens surface, and a plurality of unit lenses that are convex from the base material layer side to the back side are arranged,
At least a part of the lens surface is formed of a resin containing a plurality of scale-like metal thin films, and includes a reflective layer that reflects light,
The metal thin film has a surface perpendicular to the thickness direction arranged substantially parallel to the lens surface,
Reflective screen featuring. The reflective screen according to claim 1.
The reflective layer is formed such that a thickness T in a direction perpendicular to the lens surface is in a range of 8 μm ≦ T ≦ 15 μm at a central portion of the lens surface in the arrangement direction of the unit lenses;
Reflective screen featuring. The reflective screen according to claim 1 or 2,
The metal thin film of the reflective layer is formed such that an average value of dimensions in the vertical direction and the horizontal direction orthogonal to the thickness direction is the same as the lens height dimension of the unit lens.
Reflective screen featuring. The reflective screen according to any one of claims 1 to 3,
The reflective layer is formed so as to fill a boundary between the lens surface and the non-lens surface;
Reflective screen featuring. The reflective screen according to claim 4.
The reflective layer is formed such that the thickness in the thickness direction of the lens layer at a position that becomes a valley bottom between the unit lenses is in a range of 10 to 120% of the lens height of the unit lenses,
Reflective screen featuring. The reflection screen according to any one of claims 1 to 5,
The resin forming the reflective layer contains a dark color material,
The reflective layer has the dark material disposed at least in part between the metal thin films;
Reflective screen featuring. The reflective screen according to claim 6.
The dark color material of the reflective layer is composed of at least one of scaly pigments, fibrous pigments, and granular pigments;
Reflective screen featuring. The reflecting screen according to claim 6 or 7,
The dark color material of the reflective layer is contained in a range of 1 to 30% by weight with respect to the weight of the whole resin,
Reflective screen featuring. The reflective screen according to any one of claims 1 to 8,
The reflection layer is laminated in an average of eight or more layers on the lens surface of each of the unit lenses.
Reflective screen featuring. A reflective screen according to any one of claims 1 to 9,
An image source for projecting image light onto the reflective screen;
A video display system comprising: A reflection screen manufacturing method for manufacturing a reflection screen that reflects image light projected from an image source and displays the image light on a screen,
A lens layer forming step of forming a lens layer having a lens surface and a non-lens surface on the back side of the base material, and a plurality of unit lenses that are convex on the back side;
A reflective layer forming step of applying a coating containing a plurality of scaly metal thin films to at least a part of the lens surface to form a reflective layer that reflects light; and
A method for manufacturing a reflective screen.