JP2015068943A - Reflection screen, manufacturing method of the same, and video display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection screen and manufacturing method of the reflection screen that include a light absorption layer preventing occurence of crack or peeling, and are excellent in exterior appearance.SOLUTION: A reflection screen according to the present invention includes: a lens layer that has a Fresnel lens shape on a rear surface side where a unit lens having a lens surface and a non-lens surface is plurally arrayed; a reflection layer that is formed on the lens surface of the lens layer; and a light absorption layer that is formed on the lens layer and on the rear surface side of the reflection layer. A dimension from a substantially triangular shape apex of the unit lens to an end thereon the rear surface side of the light absorption layer stands at 4 to 7 μm, and the light absorption layer is configured to include resin that has a Tg of -20 to 40°C and a light absorption material.

Description

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

  In recent years, display devices and display systems including various types of screens such as a reflective type and a transmissive type have been used for various purposes, and various developments have been made regarding optical characteristics and the like. For example, as a reflective screen, a short focus type image projection device (projector) that projects a video light from a close distance at a relatively large incident angle to realize a large screen display is widely used. A reflective screen corresponding to a type of image projection apparatus has been developed (for example, Patent Document 1).

  Such a short focus type image projection apparatus can project image light from above or below at a larger angle than a conventional image source with respect to the reflection screen, thereby saving an image display system using the reflection screen. Contributes to space.

JP 2008-76523 A JP 2013-68676 A

  In the reflection screen corresponding to the short focus type image projection apparatus as described above, a reflection layer is formed on the surface of the lens shape of the unit lens constituting each lens shape, and the projected image light is reflected to display an image. To do. In such a reflective screen, a non-lens surface that does not contribute to the reflection of image light is formed with a light absorption layer having the function of absorbing light, thereby absorbing external light, stray light, etc., and improving contrast, etc. (For example, Patent Document 2). However, the present inventors have found a technical problem that, when forming the light absorption layer, cracking occurs near the top of the lens layer due to drying shrinkage of the resin composition for forming the light absorption layer, and light leakage occurs. did.

  The present invention has been made in view of the above-mentioned background art and newly discovered problems, and its purpose is to provide a reflective screen having a good appearance, including a light absorption layer that prevents the occurrence of cracking and peeling, and the production thereof. The method is to provide. Another object of the present invention is to provide an image display system including the reflection screen capable of displaying a good image.

  As a result of intensive investigations to solve the above problems, the present inventors have formed the light absorption layer with a specific thickness using a resin composition for forming a light absorption layer containing a specific resin. I found out that it can be solved. The present invention has been completed based on such findings.

That is, according to one aspect of the present invention,
A reflective screen that reflects the image light projected from the image source and displays the image light so that it can be observed;
A lens layer having a lens surface and a non-lens surface, and a plurality of unit lenses that are convex on the back side;
A reflective layer that is formed on at least the lens surface and reflects light;
A light absorption layer formed on the back side of the lens layer and the reflection layer;
With
The dimension from the substantially triangular top of the unit lens to the end on the back side of the light absorption layer is 4 to 7 μm,
A reflective screen is provided in which the light absorption layer includes a resin having a Tg of -20 to 40 ° C. and a light absorption material.

  In the aspect of this invention, it is preferable that the said resin contains at least 1 type selected from the group which consists of urethane type resin, acrylic resin, and acrylic urethane type resin.

  In the aspect of this invention, it is preferable that the said light absorption material contains a black pigment.

  In the aspect of the present invention, the lens layer preferably has a Fresnel lens shape.

According to another aspect of the invention,
Reflect the image light projected from the image source and display it so that it can be observed.
A lens layer having a lens surface and a non-lens surface, and a plurality of unit lenses that are convex on the back side;
A reflective layer that is formed on at least the lens surface and reflects light;
A light absorbing layer formed on the back side of the lens layer and the reflective layer;
A method of manufacturing a reflective screen, comprising:
Forming a reflective layer for reflecting light on the lens surface;
A light absorbing layer is formed by applying a resin composition for forming a light absorbing layer containing a resin having a Tg of -20 to 40 ° C. and a light absorbing material to the surface on which the lens layer and the reflective layer are formed. And a process of
Comprising
A reflective screen manufacturing method is provided in which the dimension from the substantially triangular top of the unit lens to the end on the back side of the light absorption layer is 4 to 7 μm.

According to yet another aspect of the invention,
A reflective screen as described above;
An image source for projecting image light onto the reflective screen;
A video display system is provided.

  ADVANTAGE OF THE INVENTION According to this invention, a reflective screen with a favorable external appearance provided with the light absorption layer which prevented generation | occurrence | production of a crack and peeling and its manufacturing method can be provided. Further, it is possible to provide an image display system including the reflective screen capable of displaying a good image.

It is a figure explaining video display system 1 of an embodiment. It is a figure explaining the layer structure of the reflective screen 10 of embodiment. It is a figure explaining the lens layer 13 of embodiment. 2 is an electron micrograph of a cross section of the reflective screen of Example 1. FIG. 4 is an electron micrograph of a cross section of a reflective screen of Comparative Example 1.

  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, the numerical values such as the dimensions of the respective members and the material names described in the present specification are examples of the embodiment, and are not limited thereto, and may be appropriately selected and used. Further, in the present specification, terms specifying the shape and geometric conditions, for example, terms such as parallel and orthogonal, have the same optical functions in addition to being strictly meant, and are parallel and orthogonal. It also includes a state having an appreciable error.

  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 10, a video source LS, and the like. In this video display system 1, the reflective screen 10 reflects the video light L projected from the video source LS, and displays the video on the screen. The video display system 1 of the present embodiment can be used as a front projection television system or the like.

  The video source LS is a video light projection device that projects the video light L onto the reflection screen 10. The video source LS of this embodiment is a general-purpose short focus projector. When the screen of the reflective screen 10 is viewed from the front direction (normal direction of the screen surface) in the use state, the video source LS is the center in the left-right direction of the screen of the reflective screen 10 and the screen of the reflective screen 10 It is arranged at a position below the (display area) and on the viewer side. The video source LS can project the video light L from a position where the distance from the reflective screen 10 in the normal direction of the screen surface of the reflective screen 10 (thickness direction of the reflective screen 10) 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 10 than the conventional general-purpose projector, and the incident angle of the image light L with respect to the reflection screen 10 is larger than that of the conventional projector.

  Note that the screen surface refers to a surface in the planar direction of the reflection screen 10 when viewed as the entire reflection screen 10. In the present embodiment, the screen surface of the reflective screen 10 is parallel to the screen of the reflective screen 10.

  The reflection screen 10 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 state of use, it is assumed that the screen of the reflective screen 10 of the present embodiment 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, screen horizontal direction, and thickness direction are the screen vertical direction (vertical direction), screen horizontal direction (horizontal direction), and thickness in the usage state of the reflective screen 10 unless otherwise specified. The direction (depth direction) is assumed.

  The reflective screen 10 is provided with a flat support plate 50 on the back side thereof via a bonding layer (not shown) made of an adhesive material or the like, and the support plate 50 maintains its flatness. . However, the present invention is not limited thereto, and the reflective screen 10 may be supported by a frame member (not shown) or the like and maintain its flatness. The support plate 50 is a flat plate member that has high rigidity and does not have optical transparency. The reflective screen 10 has a large screen (display area) such as a diagonal of 80 inches or 100 inches.

  FIG. 2 is a diagram illustrating the layer configuration of the reflective screen 10 of the present embodiment. In FIG. 2, it passes through the point A (see FIGS. 1A and 1B) which is the geometric center of the screen (display area) of the reflective screen 10, is parallel to the vertical direction of the screen, and is orthogonal to the screen surface. A part of a cross section (parallel to the thickness direction) is shown enlarged. The reflective screen 10 includes a surface layer 15, a base material layer 14, a lens layer 13, a reflective layer 12, a light absorbing layer 11, and the like in order from the image source side (observer side). Below, each layer is demonstrated.

  In the base material layer 14, the surface layer 15 is integrally formed on the observer side, and the lens layer 13 is integrally formed on the back side (back side). The base material layer 14 is a layer that becomes a base material (base) for forming the lens layer 13. The base material layer 14 has a light diffusion layer 141 and a colored layer 142, which are laminated together. In the present embodiment, as illustrated in FIG. 2A, an example in which the light diffusion layer 141 is on the back side and the colored layer 142 is positioned on the viewer side (video source side) has been described. The light diffusion layer 141 may be located on the viewer side, and the colored layer 142 may be located on the back side.

  The light diffusion layer 141 is a layer that includes a light-transmitting resin and a diffusion material that diffuses light, and has a function of diffusing light. The light diffusion layer 141 has a function of widening the viewing angle and improving the in-plane uniformity of brightness. Examples of the resin that forms the light diffusion layer 141 include PET (polyethylene terephthalate) resin, PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, MBS (methyl methacrylate / butadiene / styrene) resin, and acrylic resin. TAC (triacetyl cellulose) resin, PEN (polyethylene naphthalate) resin, and the like can be used.

  The thickness of the light diffusion layer 141 is preferably about 150 to 3000 μm (about 0.15 to 3 mm), although it depends on the screen size of the reflection screen 10. Further, as the diffusing material, particles made of resin such as acrylic resin, epoxy resin, silicone, or inorganic particles can be used, and those having an average particle diameter of about 1 to 50 μm can be used. preferable.

  The colored layer 142 is a layer colored with a coloring material such as a dye or a pigment such as gray or black for obtaining a predetermined transmittance. The colored layer 142 has a function of absorbing unnecessary external light such as illumination light incident on the reflective screen 10 and stray light and improving the contrast of the image. The colored layer 142 is preferably formed of a PET resin containing a dye, a pigment, or the like, a PC resin, an MS resin, an MBS resin, an acrylic resin, a TAC resin, a PEN resin, or the like. In addition, as the coloring material, it is possible to use a dark-colored dye or pigment such as gray or black, or a metal salt such as carbon black, graphite, or black iron oxide. The thickness of the colored layer 142 is preferably about 30 to 3000 μm, although it depends on the screen size of the reflective screen 10. The base material layer 14 of the present embodiment is formed by co-extrusion of the light diffusion layer 141 and the colored layer 142 so that these layers are integrally laminated.

  FIG. 3 is a diagram illustrating the lens layer 13 of the present embodiment. FIG. 3A shows a state where the lens layer 13 is observed from the front side on the back side, and the reflection layer 12 and the light absorption layer 11 are omitted for easy understanding. FIG. 3B shows a part of the cross section shown in FIG. The lens layer 13 is a light-transmitting layer provided on the back side of the base material layer 14 and preferably has a Fresnel lens shape. As shown in FIG. 3A, the lens layer 13 of the present embodiment is a circular Fresnel lens in which a plurality of unit lenses 131 that are unit optical elements are arranged concentrically around the point C on the back surface. It has a shape.

  In the present embodiment, the circular Fresnel lens formed by arranging the unit lenses 131 is Fresnel, which is the optical center when the screen of the reflective screen 10 is viewed from the front direction (normal direction of the screen surface). The center point C is located in the center in the left-right direction of the reflective screen 10 and below the screen (display area) of the reflective screen 10. In the present embodiment, as described above, the lens layer 13 will be described by taking an example in which a circular Fresnel lens is provided on the back side surface, but a form having a linear Fresnel lens on the back side surface may be employed.

  2 and 3B, the unit lens 131 is parallel to the direction orthogonal to the screen surface (thickness direction of the reflective screen 10) and is a cross section in a cross section parallel to the arrangement direction of the unit lenses 131. The shape is a substantially triangular shape. The unit lens 131 is convex on the back side, and includes a lens surface 132 and a non-lens surface 133 that faces the lens surface 132. In the usage state of the reflective screen 10, the lens surface 132 is positioned above the non-lens surface 133 in the vertical direction across the vertex t.

  In the unit lens 131, as shown in FIG. 3B, the angle formed between the lens surface 132 and the surface parallel to the screen surface is α, and the angle formed between the non-lens surface 133 and the surface parallel to the screen surface is β (β> α). The arrangement pitch of the unit lenses 131 is P, and the lens height of the unit lenses 131 (the dimension from the apex t in the thickness direction of the screen to the point v that is the valley bottom between the unit lenses 131) 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 131 are shown to be constant in the arrangement direction of the unit lenses 131. However, the unit lens 131 of the present embodiment has a constant arrangement pitch P and the like, but the angle α gradually increases as the angle α moves away from the point C that becomes the Fresnel center in the arrangement direction of the unit lenses 131. ing.

  However, the present invention is not limited to this, and the angle α or the like may be constant, or the arrangement pitch P may gradually change along the arrangement direction of the unit lenses 131. The angles α and β, the array pitch P, and the like are the size of the pixel of the video source LS that projects the video light, the projection angle of the video source LS (the incident angle of the video light on the screen surface of the reflective screen 10), It can be changed as appropriate according to the screen size of the reflective screen 10, the refractive index of each layer, and the like.

  The lens layer 13 is formed of an ultraviolet curable resin such as urethane acrylate or epoxy acrylate. The lens layer 13 may be formed of another ionizing radiation curable resin such as an electron beam curable resin. The lens layer 13 of the present embodiment is shaped, for example, in the shape of a circular Fresnel lens filled with an ultraviolet curable resin on one surface of the base material layer 14 (the surface on the light diffusion layer 141 side in the present embodiment). It is formed by an ultraviolet molding method or the like in which a mold is pressed, irradiated with ultraviolet rays and cured, and then released from the mold. Therefore, you may mix | blend various additives, such as a mold release agent, in order to improve the mold release property to the ultraviolet curable resin etc. which form this lens layer 13, etc.

  The lens layer 13 may use a thermoplastic resin, and may be formed by a press molding method, an injection molding method, an extrusion molding method, or the like according to the Fresnel lens shape of the lens layer 13. In the case of such a lens layer 13, the base material layer 14 (light diffusion layer 141) 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 13 and the base material layer 14 may be molded in an integrally laminated state.

  The reflection layer 12 is a layer having an action of reflecting light. The reflective layer 12 is formed on at least the lens surface 132. In the present embodiment, the reflection layer 12 is formed on the lens surface 132 as shown in FIG. 2 and FIG. 3B, but not on the non-lens surface 133. The reflective layer 12 may be formed on at least a part of the non-lens surface 133 as long as it is thin enough not to reflect light. The reflective layer 12 is preferably formed on the lens surface 132 by vapor-depositing a metal such as aluminum, silver, or nickel, sputtering, or transferring a metal foil. The reflective layer 12 is made of a white or silver paint, an ultraviolet curable resin or thermosetting resin containing a white or silver pigment or bead, a metal vapor deposition film such as silver or aluminum, a metal foil, or the like. It is also possible to form by coating and curing a paint containing pulverized particles or fine flakes by various coating methods such as spray coating, die coating, screen printing, and groove filling by wiping. The reflective layer 12 of this embodiment is formed by evaporating aluminum or the like on the lens surface 132.

  The light absorption layer 11 is provided on the back side of the reflection layer 12 and the lens layer 13 so as to cover them, and is a layer having an action of absorbing light. The light absorption layer 11 sufficiently fills the valleys between the unit lenses 131, and the surface on the back side of the light absorption layer 11 is an image source of the support plate 50 via an adhesive layer (not shown). It is joined to the side surface. Since the light absorption layer 11 is formed on the non-lens surface 133 as shown in FIG. 2 and the like, the light absorption layer 11 can improve the contrast by absorbing external light incident from the observer side. it can. In particular, when the support plate 50 has light transmittance, the light absorption layer 11 absorbs external light incident from the back side, so that a decrease in contrast can be suppressed. Furthermore, the light absorption layer 11 preferably has a function of suppressing deterioration such as oxidation of the reflection layer 12 and peeling due to the oxidation. For example, an anti-oxidation function or a moisture-proof function for protecting the reflection layer 12 or the like, ultraviolet light It preferably has an absorption function or the like.

  The light absorption layer 11 includes a resin having a specific glass transition temperature (Tg) and a light absorption material. The Tg of the resin forming the light absorbing layer 11 is -20 to 40 ° C, preferably -15 to 35 ° C, more preferably -10 to 30 ° C. If Tg of resin is in the said range, generation | occurrence | production of the crack and peeling by drying shrinkage at the time of forming a light absorption layer can be suppressed. Such a resin may be a thermosetting resin or an ultraviolet curable resin. For example, urethane resin, acrylic resin, acrylic urethane resin, and the like can be given. As the light absorbing material, black pigments such as carbon black, pigments of other colors, beads having a light absorbing action, and the like can be used. From the viewpoint of light absorption efficiency, it is preferable to use a black pigment.

  The light absorption layer 11 is obtained by applying a resin composition for a light absorption layer containing the above resin and a light absorption material to the back side (Fresnel lens shape side) of the lens layer 13 in which the reflection layer 12 is formed on the lens surface 132. It can be formed by curing. The resin composition for a light absorbing layer may be adjusted in viscosity by adding an organic solvent or water. The method for forming the light absorption layer 11 is not particularly limited, and a conventionally known method can be used. For example, screen printing, roll coating, gravure reverse coating, inkjet method, flow coating method, and die coating method can be used.

  In the thickness direction of the reflective screen 10, the light absorption layer 11 has a dimension L from the point t, which is a substantially triangular apex between the unit lenses 131, to the end on the back side of the light absorption layer is 4 to 7 μm, preferably Is 4.5 to 6.5 μm, more preferably 5 to 6 μm. If the dimension L is about the above range, the light absorption layer can be prevented from cracking to prevent light leakage, and the appearance can be improved.

  Returning to FIG. 2, the surface layer 15 is a layer provided on the viewer side (image source side) in the reflective screen 10. In the present embodiment, the surface layer 15 is on the viewer side of the base material layer 14, and is provided at a position closest to the viewer side in the reflective screen 10. The surface layer 15 can be provided with one or a plurality of necessary functions such as an antireflection function, an antiglare function, an ultraviolet absorption function, an antifouling function, an antistatic function, a hard coat function, and a touch panel function. . This surface layer 15 may be a layer separate from the base material layer 14 and may be joined to the base material layer 14 by an adhesive material (not shown) or the like. It is good also as a form directly formed by apply | coating resin etc. which have various functions.

  The surface layer 15 of this embodiment has an antiglare function and a hard coat function. The surface layer 15 has a fine uneven shape (mat shape) on the surface on the viewer side, and is formed of an ionizing radiation curable resin or the like having a hard coat function. The thickness of the surface layer 15 can be about 10 to 100 μm.

  The state of the image light and the external light incident on the reflection screen 10 of this embodiment will be described. In order to facilitate understanding, it is assumed that the refractive index of the surface layer 15, the base material layer 14 (the base material of the colored layer 142 and the light diffusion layer 141), and the lens layer 13 is the same, and the image light L1 and the external light G1, G2 are used. The light diffusing action of the light diffusing layer 141 with respect to is omitted and shown in FIG. 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 10, passes through the surface layer 15 and the base material layer 14, and unit lens 131 of the lens layer 13. Incident to Then, the image light L1 enters the lens surface 132, is reflected by the reflective layer 12, and exits from the reflective screen 10 toward the observer O side. The image light L1 is projected from below the reflection screen 10, 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 10. Therefore, the image light L1 does not directly enter the non-lens surface 133, and the non-lens surface 133 does not affect the reflection of the image light L1.

  On the other hand, unnecessary external lights G1 and G2 such as illumination light are incident mainly from above the reflection screen 10 and transmitted through the surface layer 15 and the base material layer 14 as shown in FIG. Incident on 131. A part of the external light G1 enters the non-lens surface 133 and is absorbed by the light absorption layer 11. In addition, a part of the external light G2 is reflected by the lens surface 132 and mainly travels to the lower side of the reflective screen 10, so that it does not reach the observer O directly. Significantly less than light L1. Therefore, the reflective screen 10 can suppress a decrease in the contrast of the image due to the external lights G1 and G2. Therefore, according to the reflective screen 10 of this embodiment, a bright and good image can be displayed even in a bright room environment.

  The reflection screen and the image display system according to the present invention can be modified as the following (1) to (9).

  (1) In this embodiment, although the example which forms the reflection layer 12 by aluminum vapor deposition was shown, the vapor deposition film of another metal may be sufficient. The reflective layer 12 may be formed by applying a white or silver paint, or may be formed by a transfer foil or the like.

  (2) In this embodiment, the lens layer 13 uses an ultraviolet curable resin such as an epoxy acrylate resin. However, the present invention is not limited to this. For example, the lens layer 13 may be made of a thermoplastic resin. At this time, a silicone-based mold release agent may be used as a mold release agent for improving the mold release property during extrusion molding or injection molding without using a phosphoric acid-based mold release agent such as a phosphate ester. Moreover, it is not necessary to add a mold release agent.

  (3) In the present embodiment, the video display system 1 includes a video source LS that is a short focus type projector, and a reflective screen 10 that reflects video light projected from the video source LS and displays a video. It was supposed to be. However, the present invention is not limited to this. For example, 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 10 is the image. It is good also as a form corresponding to the source LS.

  (4) In the present embodiment, the base material layer 14 is formed by co-extrusion of the light diffusion layer 141 and the colored layer 142 so that these layers are integrally laminated. However, the present invention is not limited thereto, and for example, the light diffusion layer 141 and the colored layer 142 may be separately extruded and joined together by an adhesive layer or the like to form the base material layer 14. Alternatively, the base material layer 14 may be a single layer and may contain both a diffusing material and a colorant such as a pigment or a dye. Furthermore, the base material layer 14 includes a light diffusing layer 141 and a colored layer 142, and the colored layer 142 includes a diffusing material in addition to the coloring material, or the light diffusing layer 141 includes a coloring material in addition to the diffusing material. Or a form containing

  (5) In the present embodiment, the unit lens 131 has an example in which the cross-sectional shape illustrated in FIG. 2 or the like is a substantially triangular shape, but is not limited thereto, and is, for example, a substantially trapezoidal shape. It is good also as a form which a surface opposes on both sides of the top surface parallel to a 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 light absorption layer may be formed on the top surface, or a reflection layer may be formed. In the present embodiment, the unit lens 131 has an example in which the lens surface 132 and the non-lens surface 133 are linear in the cross section shown in FIG. 2 and the like. A part of the lens surface 132 or the non-lens surface 133 may be curved. Furthermore, in the present embodiment, the lens surface 132 and the non-lens surface 133 of the unit lens 131 are both single surfaces. 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.

  (6) In the present embodiment, an example in which the non-lens surface 133 is covered with the light absorbing layer 11 is shown in the reflective screen 10, but the present invention is not limited thereto, and the reflective layer 12 is formed on the non-lens surface 133. It is good also as a form made. In this case, the reflective layer 12 may be formed so that the valleys between the unit lenses 131 are filled so that the surface on the back side thereof is substantially planar, or has a predetermined thickness along the uneven shape of the unit lenses 131. The thickness may be formed, or the thickness may not be uniform as long as it has sufficient reflection characteristics.

  (7) In the present embodiment, the reflective screen 10 is joined to the support plate 50 provided on the back side thereof via an adhesive material layer (not shown) and the like, and has an example of a substantially flat plate shape. Not limited to this, for example, the support plate 50 may not be provided, and the reflective screen 10 may be bonded to the wall surface or the like via an adhesive layer or the like, or may be fixed to the wall surface with the support plate 50 bonded to the back surface. It is good also as a form etc. which are hung on a wall surface by support members, such as a hook. In the present embodiment, the reflective screen 10 has an example of a substantially flat plate shape when in use and not in use. However, the present invention is not limited to this. . In the case of such a configuration, the support plate 50 or the like is not provided, and the back side of the reflective screen 10 is covered with a cloth or resin light-shielding curtain that hardly transmits light, a layer that improves scratch resistance, or the like. This can improve the contrast and prevent damage to the lens layer and the reflective layer.

  (8) In the present embodiment, the reflective screen 10 includes the light absorbing layer 11, the reflective layer 12, the lens layer 13, the base material layer 14 (the light diffusion layer 141 and the colored layer 142), and the surface layer 15 in this order from the back side. Although the example which comprises is demonstrated, it is not limited to this. For example, the reflective screen 10 may be provided with a transparent base material layer serving as a base material of the lens layer 13 between the base material layer 14 and the lens layer 13, and has a diffusion characteristic in the screen vertical direction and the screen horizontal direction. Different anisotropic diffusion layers and the like may be provided, and the layer configuration of the reflective screen 10 can be changed as appropriate in accordance with desired optical characteristics and the like.

  (9) In the present embodiment, the video source LS is positioned below the reflective screen 10 in the vertical direction, and the video light L is projected obliquely upward from below the reflective screen 10. However, the present invention is not limited thereto. For example, the video source LS may be positioned above the reflective screen 10 in the vertical direction, and the video light L may be projected obliquely downward from above the reflective screen 10. At this time, the reflective screen 10 reverses the vertical direction of the lens layer 13 shown in FIGS. 2 and 3 and the like, and the point C which is the optical center (Fresnel center) of the circular Fresnel lens is located above the reflective screen 10. The form may be used.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples.

<Manufacture of reflection screen 1>
First, the base material layer 14 was prepared, and the surface layer 15 was formed on one surface thereof. Subsequently, the lens layer 13 was formed on the surface of the base material layer 14 opposite to the surface layer 15. This lens layer 13 is molded after the base material layer 14 is pressed against a mold for shaping a Fresnel lens shape filled with a resin composition for forming a lens layer containing an ultraviolet curable resin and cured by irradiating with ultraviolet rays. It was created by an ultraviolet molding method for releasing the mold. Then, the reflective layer 12 was formed on the lens surface 132 by aluminum vapor deposition.

  Next, a resin composition for forming a light absorption layer (solid content) containing a urethane-based resin (containing Tg = 0 to 10 ° C., containing butyl cellosolve and butyl diglycol, viscosity: about 15000 mPa · s) and a black pigment by a roll coating method. : 33%), and dried and cured at 60 ° C. for 10 minutes to form the light absorption layer 11, thereby obtaining the reflective screen 1. The dimension L from the substantially triangular top of the unit lens to the end on the back side of the light absorption layer was 5 μm.

<Manufacture of reflective screens 2-6>
As shown in Table 1, reflective screens 2 to 6 were produced in the same manner as the reflective screen 1 except that the resin was changed to a urethane resin having a different Tg or the dimension L of the light absorption layer was changed.

<Evaluation of the state of the light absorption layer>
The cross section of the reflection screens 1 to 6 manufactured above is observed with a metal microscope (manufactured by OLYMPUS, model number: STM6-F10-2). The state was evaluated according to the following evaluation criteria. The results are shown in Table 1.
<Evaluation criteria>
-(Circle): The crack of the light absorption layer 11 and peeling did not generate | occur | produce.
*: The light absorption layer 11 was cracked or peeled off.

  Moreover, the electron micrograph of the cross section of the reflective screen 1 of Example 1 and the reflective screen 3 of the comparative example 1 is shown in FIG.4 and FIG.5, respectively. In FIG. 4, it can be seen that the light absorption layer 11 is not cracked or peeled in the vicinity of the substantially triangular apex t of the unit lens 131. On the other hand, in FIG. 5, it can be seen that peeling of the light absorption layer 11 occurs in the vicinity of the substantially triangular apex t of the unit lens 131 when the part circled by the dotted line is seen.

<Appearance evaluation>
About the reflective screens 1-6 manufactured above, the external appearance from the image source side (observer side) was visually evaluated according to the following evaluation criteria.
<Evaluation criteria>
○: There was no change in the appearance due to the influence of the light absorption layer 11.
*: Wood grain was observed under the influence of the light absorption layer 11.

DESCRIPTION OF SYMBOLS 1 Image display system 10 Reflective screen 11 Light absorption layer 12 Reflective layer 13 Lens layer 131 Unit lens 132 Lens surface 133 Non-lens surface 14 Base material layer 141 Light diffusion layer 142 Colored layer 15 Surface layer LS Image source

Claims (6)

A reflective screen that reflects the image light projected from the image source and displays the image light so that it can be observed;
A lens layer having a lens surface and a non-lens surface, and a plurality of unit lenses that are convex on the back side;
A reflective layer that is formed on at least the lens surface and reflects light;
A light absorption layer formed on the back side of the lens layer and the reflection layer;
With
The dimension from the substantially triangular top of the unit lens to the end on the back side of the light absorption layer is 4 to 7 μm,
The reflective screen in which the said light absorption layer contains resin which has Tg of -20-40 degreeC, and a light absorption material.   The reflective screen according to claim 1, wherein the resin includes at least one selected from the group consisting of a urethane resin, an acrylic resin, and an acrylic urethane resin.   The reflective screen according to claim 1, wherein the light absorbing material includes a black pigment.   The reflective screen according to claim 1, wherein the lens layer has a Fresnel lens shape. Reflect the image light projected from the image source and display it so that it can be observed.
A lens layer having a lens surface and a non-lens surface, and a plurality of unit lenses that are convex on the back side;
A reflective layer that is formed on at least the lens surface and reflects light;
A light absorption layer formed on the back side of the lens layer and the reflection layer;
A method of manufacturing a reflective screen, comprising:
Forming a reflective layer for reflecting light on the lens surface;
A light absorbing layer is formed by applying a resin composition for forming a light absorbing layer containing a resin having a Tg of -20 to 40 ° C. and a light absorbing material to the surface on which the lens layer and the reflective layer are formed. And a process of
Comprising
A method for manufacturing a reflective screen, wherein a dimension from a substantially triangular top of the unit lens to an end on the back side of the light absorption layer is 4 to 7 μm. The reflective screen according to any one of claims 1 to 4,
An image source for projecting image light onto the reflective screen;
A video display system comprising: