JP2016006528A - Reflective screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflective screen capable of displaying good high-contrast images even in a bright room environment.SOLUTION: A reflective screen 10 includes a lens layer 12 having a Fresnel lens pattern comprising a plurality of arrayed unit lenses on a back face side thereof, where each of the unit lenses 121 is convex on the back face side, has a substantially rectangular cross-section in a plane that is parallel to an array direction of the unit lenses 121 and perpendicular to a screen surface, and includes a top surface 121b occupying a top portion of the unit lens 121 as well as a lens surface 121a and a non-lens surface 121c that face each other with the top surface 121b in between. A reflective section 13 for reflecting light is formed on the lens surface 121a, while a light absorptive section 14 for absorbing light is formed on the top surface 121b. An adhesive material layer is provided on the most back face side of the reflective screen 10 in a thickness direction.

Description

  The present invention relates to a reflective screen.

Conventionally, as a reflective screen, a mat type reflective screen having a mat shape on the surface is known. However, such a mat type reflection screen has a low contrast in a bright room environment, and a good image cannot be obtained.
In recent years, there has been an increasing demand for reflective screens capable of displaying images with good contrast and the like even in a bright room environment. In view of this, a reflective screen having a reflective layer formed on the surface of a lens layer having a linear Fresnel lens shape formed by arranging a plurality of unit lenses or a circular Fresnel lens shape has been developed (for example, Patent Documents 1 and 2).
In a reflective screen using such a lens layer, a reflective 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. Moreover, in such a reflective screen, a suitable viewing angle can be secured by providing a light diffusion layer or the like that diffuses light closer to the observer side (light source side) than the lens layer.

JP-A-8-29875 JP 2008-76522 A

In addition, in such a reflective screen, a light absorbing layer having a function of absorbing light is formed on a non-lens surface that does not contribute to reflection of image light, so that external light, stray light, etc. can be absorbed, and contrast can be improved. Some of them have been improved.
However, since the unit lens is very fine, it is difficult to accurately form the reflection layer and the light absorption layer.
The reflection screens described in Patent Documents 1 and 2 do not include the light absorption layer as described above, and do not disclose any method for manufacturing the reflection screen including the light absorption layer.

  An object of the present invention is to provide a reflective screen that can display a good image with high contrast even in a bright room environment.

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.
The invention of claim 1 is a reflective screen that reflects the image light (L) projected from the image source (LS) and displays it in an observable manner, and has a Fresnel lens shape in which a plurality of unit lenses (121) are arranged. The lens unit includes a lens layer (12) on the back side, and the unit lens is convex on the back side, and has a substantially square cross-sectional shape parallel to the arrangement direction of the unit lenses and perpendicular to the screen surface. A top surface (121b) that is a top of the unit lens, a lens surface (121a) that faces the top surface, and a non-lens surface (121c), and the lens surface has a silver color Are formed, light reflecting portions (13, 23) for reflecting light are formed, and light absorbing portions (14, 24) for absorbing light are formed on the top surface, which is the rearmost surface in the thickness direction of the reflecting screen. Adhesive layer on the side Further comprising a reflective screen according to claim (10, 20).
According to a second aspect of the present invention, in the reflective screen according to the first aspect, the reflective portions (13, 23) are formed so as to fill valleys between the unit lenses (121). Reflective screen (10, 20).
According to a third aspect of the present invention, in the reflective screen according to the first or second aspect, the lens layer (12) is made of an ionizing radiation curable resin and is provided closer to the image source than the lens layer. A reflective screen (10, 20) characterized by being formed integrally with a base material layer (11).
The invention according to claim 4 is the reflection screen according to any one of claims 1 to 3, wherein the top surface (121b) is formed in a concave curved surface shape. It is a screen.
According to a fifth aspect of the present invention, in the reflective screen according to any one of the first to fourth aspects, the reflective portion (23) includes the lens surface (121a) and the non-lens surface (121c). The reflective screen (20) is characterized by covering the back side of the light absorbing portion (24) formed on the top surface (121b).
The invention of claim 6 is characterized in that, in the reflective screen according to any one of claims 1 to 5, a flat support plate (50) is joined by the adhesive material layer. Reflective screen (10, 20).
A seventh aspect of the present invention is the reflective screen according to any one of the first to fifth aspects, wherein a light shielding curtain or a protective layer is joined by the adhesive material layer. (10, 20).

(1) The reflective screen of the present invention includes a lens layer having a Fresnel lens shape in which a plurality of unit lenses are arranged on the back side, and the unit lens is convex on the back side and is parallel to the arrangement direction of the unit lenses. The shape of the cross section parallel to the direction orthogonal to the screen surface is substantially rectangular, and includes a top surface that is the top of the unit lens, a lens surface that faces the top surface, and a non-lens surface. In this example, a reflection part for reflecting light is formed, and a light absorption part for absorbing light is formed on the top surface.
Accordingly, the image light can be efficiently reflected to the viewer side, unnecessary external light such as illumination light can be absorbed, and a good image with high contrast can be displayed even in a bright room environment. Moreover, since the light absorption part is formed at the top, it is easy to form.
Moreover, since the reflective screen is provided with the adhesive layer on the most back side in the thickness direction, other members can be joined to the back side of the reflective screen.

(2) Since the reflection part is formed in the reflection screen so as to fill the valleys between the unit lenses, the reflection part can be easily formed. In addition, since a sufficient thickness as the reflecting portion can be obtained, the reflectance of the image light can be improved and a bright image can be displayed.

(3) The lens layer is made of an ionizing radiation curable resin, and is formed integrally with a base material layer provided closer to the image source than the lens layer. Therefore, the shape of the unit lens formed on the lens layer can be manufactured with high accuracy using the base material layer as a base (base material).

(4) The manufacturing method of the reflective screen of the present invention includes a light absorbing part forming step of forming a light absorbing part by applying a light absorbing material that absorbs light on the top surface, and a trough between the arranged unit lenses. A reflecting portion forming step of filling a reflecting material that reflects light to form a reflecting portion.
Thereby, formation of a reflection part and a light absorption part can be performed easily, and a reflective screen can be provided at low cost.

(5) In the reflective screen manufacturing method, after performing the reflective portion forming step, the light absorbing portion forming step is performed, and in the reflective portion forming step, the reflective material is filled in the valleys between the unit lenses to form the reflective portion. In the light absorption part forming step, the light absorption part is formed by applying the light absorption material to the entire surface formed by the reflective material and the top surface filled in the valleys between the unit lenses. Thereby, formation of a reflection part and a light absorption part can be performed easily, and a reflective screen can be provided at low cost.

(6) The reflective screen manufacturing method performs the light absorbing portion forming step and then the reflecting portion forming step. In the light absorbing portion forming step, the light absorbing portion is formed by applying the light absorbing material only on the top surface. In the reflection part forming step, the reflection material is applied and filled in the valleys between the unit lenses to form the reflection part. Thereby, formation of a reflection part and a light absorption part can be performed easily, and a reflective screen can be provided at low cost.

(7) Since the flat screen support plate is bonded to the back side of the reflective screen by the adhesive layer, the flatness of the screen can be maintained.
Further, since the light-shielding curtain and the protective layer are joined to the back side of the reflective screen by the adhesive material layer, it is possible to shield external light from the back side and improve the scratch resistance on the back side. Moreover, in such a form, since the reflective screen can be wound, the reflective screen can be wound and stored when not in use.

It is a figure which shows the video display system using the reflective screen 10 of 1st Embodiment. It is a figure which shows the layer structure of the reflective screen 10 of 1st Embodiment. It is a figure explaining a part of manufacturing method of the reflective screen 10 of 1st Embodiment. It is a figure which shows the layer structure of the reflective screen 20 of 2nd Embodiment. It is a figure explaining a part of manufacturing method of the reflective screen 20 of 2nd Embodiment.

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. Therefore, the incident angle of each light beam may be different from the actual angle.
In addition, the terms “plate”, “sheet”, “film” and the like are used, but these are generally used in the order of thickness, “plate”, “sheet”, “film”. I am using it. However, there is no technical meaning for such proper use, so the terms of sheets, plates, and films can be replaced as appropriate. For example, the optical sheet may be an optical film or an optical plate.
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.

(First embodiment)
FIG. 1 is a diagram illustrating an image display system using the reflective screen 10 of the first embodiment.
The video display system includes a reflective screen 10, a video source LS, and the like. In the present embodiment, a general video display system in which the reflective screen 10 reflects video light projected from the video source LS and displays video on the screen will be described. The video display system is not limited to this, and may be, for example, a front projection television system that projects video light from the video source LS, or detects the positions of the reflective screen 10, the video source LS, and the reflective screen on the observation screen. An interactive board system including a position detection unit and a personal computer may be used.
The video source LS is a device that projects the video light L onto a reflection screen, and a general-purpose projector or the like can be used. As shown in FIG. 1B, the video source LS projects the video light L from the lower side of the screen center of the screen when the reflective screen 10 is used.

The reflection screen 10 reflects the image light L projected by the image source LS toward the observer O and displays an image. In the state of use, the observation screen of the reflection screen 10 has a flat shape, and when viewed from the observer O side, the observation screen has a substantially rectangular shape with the long side direction being the horizontal direction of the screen. In the following description, the screen up and down direction and the screen left and right direction are the screen up and down direction (vertical direction) and the screen left and right direction (horizontal direction) when the reflective screen 10 is used, unless otherwise specified. To do.
In the reflection screen 10, a flat support plate 50 is provided on the back side of the reflection portion 13 (see FIG. 2) via a bonding layer (not shown) made of an adhesive material or the like. Therefore, the flatness is maintained.

FIG. 2 is a diagram illustrating a layer configuration of the reflective screen 10 according to the first embodiment.
In FIG. 2A, a part of a cross section in a cross section that is parallel to the screen surface of the reflective screen 10 and parallel to the vertical direction of the screen in the use state is shown enlarged. In FIG. 2B, the unit lens 121 of the cross section in FIG. FIG. 2C illustrates the unit lens shape. In FIG. 2A, the support plate 50 and the like are omitted for easy understanding.
The reflective screen 10 includes a surface functional layer 15, a base material layer 11, a lens layer 12, a reflective portion 13, a light absorbing portion 14, and the like in that order from the image source side (observation surface side).
For example, the reflective screen 10 of the present embodiment can have a diagonal screen size of 80 inches (1220 × 1620 mm).

The base material layer 11 is a transparent or translucent sheet-like member that becomes the base material of the reflective screen 10. A surface functional layer 15 is provided on the image source side of the base material layer 11, and a lens layer 12 is integrally formed on the back side. Examples of the base material layer 11 include PET (polyethylene terephthalate) resin having a thickness of 100 to 200 μm, PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, MBS (methyl methacrylate / butadiene / styrene). A resin-made sheet-like member such as a resin, an acrylic resin, or a TAC (triacetyl cellulose) resin can be used. The base material layer 11 of this embodiment uses a sheet-like member made of PET resin having a thickness of 100 μm.
The base material layer 11 may include a diffusing material that diffuses light for the purpose of widening the viewing angle and improving the in-plane uniformity of brightness, and for a predetermined transmittance. It may be colored with a dye or pigment such as gray. Moreover, it is good also as a form etc. which the light-diffusion layer etc. which have a light-diffusion effect | action on this base material layer 11 were laminated | stacked integrally.

The lens layer 12 is a light-transmitting layer provided on the back side of the base material layer 11, and a Fresnel lens shape is formed on the back side (the side opposite to the base material layer 11).
The Fresnel lens shape formed on the lens layer 12 may be a linear Fresnel lens shape in which unit lenses are arranged in one direction, or a circular Fresnel lens shape in which unit lenses are arranged concentrically. The optimum one can be selected and used as appropriate in accordance with the use environment, the optical characteristics of the image source LS, and the like. In the present embodiment, the lens layer 12 will be described with an example in which a linear Fresnel lens shape is formed.
This linear Fresnel lens shape is formed by arranging a plurality of unit lenses 121 along the vertical direction of the screen.
The lens layer 12 is formed of an ultraviolet curable resin. The lens layer 12 may be formed of another ionizing radiation curable resin such as an electron beam curable resin.
The lens layer 12 can be produced, for example, by forming the lens layer 12 on the other surface of the base material layer 11 having the surface functional layer 15 formed on one surface by an ultraviolet molding method or the like. By forming the lens layer 12 (unit lens 121) by an ultraviolet molding method, it is possible to form the unit lens 121 with finer pitch and higher shape accuracy.

The unit lens 121 is parallel to the direction orthogonal to the screen surface (thickness direction of the reflection screen 10), and the cross-sectional shape in a cross section parallel to the arrangement direction of the unit lenses 121 is a substantially square shape, and the top surface is the top. 121b, a lens surface 121a corresponding to the lens surface of the Fresnel lens, and a non-lens surface 121c facing the lens surface 121a with the top surface 121b interposed therebetween. The unit lens 121 of the present embodiment has a substantially quadrangular prism shape that is convex on the back side, and its longitudinal direction is parallel to the horizontal direction of the screen and is arranged in the vertical direction of the screen.
In the unit lens 121, when the reflective screen 10 is used, the lens surface 121a is vertically above the non-lens surface 121c across the top surface 121b, that is, the non-lens surface is imaged relative to the top surface 121b in the vertical direction. The lens surface 121a is located on the side opposite to the image source LS.
The top surface 121b of the present embodiment is parallel to the screen surface and the back surface of the base material layer 11, and the cross-sectional shape of the unit lens 121 shown in FIG.

In the unit lens 121, as shown in FIG. 2B, the angle formed by the lens surface 121a and the surface parallel to the screen surface is α, and the angle formed by the non-lens surface 121c and the surface parallel to the screen surface is β ( β> α).
Further, the arrangement pitch of the unit lenses 121 is P, and the dimension of the top surface 121b in the arrangement direction of the unit lenses 121 is d. The lens height of the unit lens 121 (the dimension from the top surface 121b in the thickness direction of the screen to the point v that becomes the valley bottom between the unit lenses 121) is h.

As an example, the unit lens 121 of this embodiment has an arrangement pitch P of 100 μm, a dimension d of the top surface 121b of 15 μm, an angle α of 16 °, and an angle β of 90 °. Further, the refractive index of the unit lens 121 (lens layer 12) of the present embodiment is 1.55.
The arrangement pitch P, the dimension d, the angle α, and the angle β of the unit lenses 121 are the size of a pixel of the video source LS (projector) that projects the video light, the projection angle of the video source LS (the incident angle of the video light). ) And the like can be appropriately changed, and is not limited to the above values.

  2 shows an example in which the arrangement pitch P, the angle α and the angle β, and the lens height h of the unit lenses 121 are constant in order to facilitate understanding. Further, the arrangement pitch P of the unit lenses 121 may be substantially constant, and the angle α may be reduced as it becomes lower in the vertical direction of the screen (the arrangement direction of the unit lenses 121). For example, the arrangement pitch P may gradually change along the arrangement direction of the unit lenses 121. The shape of the unit lens 121 may be appropriately selected according to the use environment, desired optical performance, and the like.

The reflection part 13 has the effect | action which reflects light, and is formed in the lens surface 121a at least.
The reflecting portion 13 is formed of a white or silver paint, an ultraviolet curable resin or a thermosetting resin containing a white or silver pigment, beads, or the like. Further, in order to display a bright image, the reflection part 13 preferably has a reflectance of 40% or more, and more preferably 70% or more.
The reflecting portion 13 of the present embodiment is formed so as to fill the valleys between the unit lenses 121 and covers the lens surface 121a and the non-lens surface 121c, but the top surface 121b is covered. Not. Moreover, the reflection part 13 of this embodiment is formed of the ultraviolet curable resin containing a silver pigment.

The light absorbing portion 14 is a layer formed with a predetermined thickness on a surface formed by alternately arranging the top surfaces 121b and the reflecting portions 13, and has a function of absorbing light. The light absorbing portion 14 covers the top surface 121b, but does not cover the lens surface 121a and the non-lens surface 121c. The light absorbing portion 14 is formed of a thermosetting resin or an ultraviolet curable resin containing a dark color paint such as black, a dark color pigment or dye such as black, and beads having a light absorbing action.
The light absorption part 14 of this embodiment is formed with the ultraviolet curable resin containing a black pigment, The thickness can be set with 5-30 micrometers.
As described above, since the lens surface 121a and the non-lens surface 121c of the unit lens 121 are covered by the reflection unit 13, light incident on the lens surface 121a and the non-lens surface 121c is reflected by the reflection unit 13. Moreover, since the top surface 121b is covered with the light absorbing portion 14, the light incident on the top surface 121b is absorbed by the light absorbing portion 14.

As shown in FIG. 2 (c), the unit lens 121 forms a so-called linear Fresnel lens, is composed of lens surfaces 121a and 121e and non-lens surfaces 121c and 121f, and has a substantially triangular prism-shaped unit lens having a vertex 121d. The shape is the same as that obtained by cutting the top portion of 121A (the broken line portion shown in FIG. 2C).
A surface 121e indicated by a broken line in FIG. 2C is an extension of the lens surface 121a and corresponds to the lens surface. However, the image light does not reach the surface 121e due to the projection angle of the image light. This is a region that does not contribute to the reflection of image light.
The unit lens 121 of the present embodiment has a shape obtained by cutting an apex angle portion having the surface 121e and a surface 121f corresponding to an extended portion of the non-lens surface 121c facing the surface 121e in parallel with the arrangement direction of the unit lenses 121. Correspondingly, the light absorbing portion 14 is formed on the top surface 121b. By adopting such a shape, without reducing the reflectance of the image light, as shown in FIG. 2A, external light G1 and the like incident from above the reflection screen 10 reach the top surface 121b, Incident light is absorbed by the light absorber 14 and the absorption efficiency of external light can be increased.

The surface functional layer 15 is a layer provided on the viewer O side (image source side) of the base material layer 11. The surface functional layer 15 can be provided by appropriately selecting one or a plurality of necessary functions such as an antireflection function, an antiglare function, an ultraviolet absorption function, an antifouling function, and an antistatic function.
Further, when the reflective screen 10 is used as a board (screen) for displaying an interactive board image or writing characters, a hard coat function or the like for improving scratch resistance is given to the surface. Alternatively, a touch panel layer or the like may be provided.
The surface functional layer 15 is a layer different from the base material layer 11 and may be bonded to the base material layer 11 by an adhesive material (not shown) or the opposite side of the base material layer 11 from the lens layer 12. It may be formed directly on the surface.
The surface functional layer 15 of the present embodiment has an antiglare function and a scratch resistance function, and an ionizing radiation curable resin (for example, urethane) having a hard coat function on the surface of the base layer 11 on the image source LS side. Acrylate etc.) with a film thickness of about 20 μm.

Here, the state of the image light and the external light incident on the reflection screen 10 of the present embodiment will be described.
The image light L projected from the image source LS enters from below the reflection screen 10, passes through the surface functional layer 15 and the base material layer 11, and enters the unit lens 121 of the lens layer 12. As shown in FIG. 2A, the image light L enters the lens surface 121a, is reflected by the reflecting unit 13, and travels toward the observer O as an observable light beam. Here, although the non-lens surface 121c is covered with the reflecting portion 13, the angle β is larger than the incident angle of the image light L at each point in the screen vertical direction of the reflecting screen 10 (preferably 90 °). In addition, since the image light L is projected from below the reflection screen 10, the reflection of the image light L is not affected.

On the other hand, unnecessary external lights G 1 and G 2 such as illumination light are incident mainly from above the reflection screen 10, pass through the surface functional layer 15 and the base material layer 11, and enter the unit lens 121 of the lens layer 12. Then, as shown in FIG. 2A, the light is incident on the top surface 121b and absorbed by the light absorbing portion 14 (external light G1), or is incident on the non-lens surface 121c and is reflected by the reflecting portion 13, The light is incident on 121b and is absorbed by the light absorber 14 (external light G2), thereby improving the contrast.
Furthermore, as shown in FIG. 2 (a), the external light G3 incident on the reflective screen 10 from above with an incident angle smaller than the external light G1 and G2 described above is reflected by the lens surface 121a and reflected on the reflective screen 10. , It does not reach the observer O side directly.

Therefore, according to the reflective screen 10 of the present embodiment, the image light L can be efficiently reflected to the observer O side by the reflecting portion 13 formed on the lens surface 121a, and the external light G1, G2 and the lens layer can be reflected. Since the stray light generated in the light 12 can be absorbed by the light absorption unit 14, a bright and high-contrast image can be displayed even in a bright room environment.
In addition, since the top of the unit lens 121 is a flat surface (top surface 121b), the unit lens 121 is hardly damaged, can be prevented from being damaged during the manufacturing process, transport, and use, and durability can be improved.

(Method for Manufacturing Reflective Screen of First Embodiment)
FIG. 3 is a diagram illustrating a part of the manufacturing method of the reflective screen 10 of the first embodiment. 3 shows a cross section parallel to the arrangement direction of the unit lenses 121 of the reflection screen 10 and parallel to the direction orthogonal to the screen surface (the thickness direction of the screen).
First, as shown in FIG. 3A, the lens layer 12 is formed on one surface of the base material layer 11 by an ultraviolet molding method or the like.

Next, as shown in FIG. 3B, a UV curable resin containing a reflective silver pigment or the like, which is a reflective material, is wiped in the valleys between the lenses of the unit lens 121 of the lens layer 12. By doing so, the space between the unit lenses 112 is filled. Thereby, in this embodiment, the surface 13a of the reflection part 13 and the top surface 121b of the unit lens 121 become the same plane or substantially the same plane. However, the shape is not limited to this, and the surface 13a of the reflecting portion 13 may have a shape that is recessed toward the valley between the unit lenses 121 with respect to the top surface 121b.
Next, the reflecting material 13 is formed by irradiating the reflecting material with ultraviolet rays and curing it.

Next, an ultraviolet curable resin containing a black pigment as a light absorbing material is applied to the entire top surface 121b of the lens layer 12 on which the reflecting portion 13 is formed by screen printing or the like, and irradiated with ultraviolet rays. And cured to form the light absorbing portion 14. In addition, the method of apply | coating a light absorption material is not restricted to said screen printing, For example, methods, such as application | coating by a gravure reverse coat, an inkjet system, a die coat system, and a flow coat system, can be used.
Next, it cuts into a predetermined | prescribed magnitude | size and the reflective screen 10 is completed.
The above process can be applied regardless of whether the base material layer 11 and the lens layer 12 are in a web shape or a single wafer shape.

From the above, according to the present embodiment, it is possible to provide a reflective screen that can display a bright and good image with high contrast even in a bright room environment.
In addition, according to the present embodiment, the angle α and angle β, the arrangement pitch P, and the like of the unit lenses 121 can be appropriately selected according to the position of the image source LS, the environment in which the reflective screen is used, the desired optical performance, and the like. In addition, a reflective screen capable of displaying a better image can be obtained.
Furthermore, since the top part of the unit lens 121 is planar (top surface 121b), the unit lens 121 is not easily damaged.
In addition, according to the present embodiment, the above-described favorable reflective screen 10 is complicatedly processed such that a reflective material and a light-absorbing material are separately layered on the lens surface and non-lens surface of a fine unit lens. It can be manufactured easily without going through. Accordingly, it is possible to reduce working time and production cost.
Furthermore, according to this embodiment, a reflection part and a light absorption part can be continuously formed using a web-like base material layer and a lens layer, and mass production can be easily performed.
In addition, according to the present embodiment, even when the support plate 50 or the like is not provided on the back side (back side) of the reflective screen 10, the light absorbing portion 14 is located on the back side, so that the back side (back side) ) Can be absorbed, and a good image can be displayed even in a usage state where external light from the back side such as a window on the back side of the reflective screen 10 is considered.

(Second Embodiment)
FIG. 4 is a diagram illustrating a layer configuration of the reflective screen 20 according to the second embodiment.
In FIG. 4A, a part of a cross section in a cross section orthogonal to the screen surface of the reflection screen 20 of the second embodiment and parallel to the screen vertical direction in the use state (the arrangement direction of the unit lenses 121) is enlarged. Show. In FIG. 4B, the unit lens 121 of the cross section in FIG.
The reflective screen 20 of the second embodiment is substantially the same as the reflective screen 10 of the first embodiment, except that the shapes of the reflective portion 23 and the light absorbing portion 24 are different from the reflective screen 10 of the first embodiment. is there. Therefore, the same code | symbol or the same code | symbol is attached | subjected to the part which fulfill | performs the same function as the reflective screen 10 of 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted suitably.
The reflective screen 20 of the second embodiment includes a surface functional layer 15, a base material layer 11, a lens layer 12, a reflective portion 23, a light absorbing portion 24, and the like in order from the observer side (image source side). The reflective screen 20 can be used in the video display system of the first embodiment described above, instead of the reflective screen 10 of the first embodiment described above.

In the reflection screen 20 according to the second embodiment, the light absorbing portion 24 is formed on the surface of the top surface 121b. Unlike the light absorbing portion 14 of the first embodiment, the light absorbing portion 24 is formed only on the top surface 121b.
In addition, the reflective portion 23 is formed by filling the valley portion between the unit lenses 121 with the reflective material, and the lens surface 121 a and the non-lens surface 121 c are covered with the reflective portion 23. Further, the reflecting portion 23 also covers the back side of the light absorbing portion 24 as shown in FIG. In addition, you may form the reflection part 23 by predetermined thickness along the lens surface 121a and the non-lens surface 121c.
The reflection part 23 and the light absorption part 24 of this embodiment are each formed of the same material as the material capable of producing the reflection part 13 and the light absorption part 14 of the first embodiment. The reflective portion 23 may be a metal film formed by vapor deposition, sputtering, foil pressing, or the like using a highly reflective metal. In this case, the reflection portion 23 is formed in a shape along the lens surface 121a and the non-lens surface 121c in the valley portion between the unit lenses 121, and covers the lens surface 121a and the non-lens surface 121c.

(Manufacturing method of the reflective screen 20 of 2nd Embodiment)
FIG. 5 is a diagram for explaining a part of the manufacturing method of the reflective screen 20 of the second embodiment. 5 shows a cross section parallel to the arrangement direction of the unit lenses 121 of the reflection screen 20 and parallel to the direction orthogonal to the screen surface (the thickness direction of the screen).
First, as shown in FIG. 5A, the lens layer 12 is formed on one surface of the base material layer 11 by an ultraviolet molding method or the like.

  Next, as shown in FIG. 5B, a light absorbing material (in this embodiment, a thermosetting resin containing a black pigment) is applied onto the top surface 121b of the lens layer 12 by gravure offset printing, The light absorbing portion 24 is formed by curing by heating. In the blanket cylinder 60 shown in FIG. 5B, a light absorbing material is transferred from an unshown printing cylinder or the like to the outer peripheral surface thereof, and when the blanket cylinder 60 rotates, a predetermined thickness is formed on the top surface 121b. The light absorbing material is applied.

Next, as shown in FIG. 5C, a reflective material (in this embodiment, an ultraviolet curable resin having a silver pigment) is applied between the unit lenses 121 of the lens layer 12 by screen printing or the like. The method for applying the reflective material is not limited to the above screen printing, and for example, a gravure reverse coating method, an ink jet method, a die coating method, a flow coating method, a vacuum deposition method, or the like can be used.
Next, it cuts into a predetermined | prescribed magnitude | size and the reflective screen 20 is completed.

Therefore, according to the present embodiment, similar to the first embodiment, it is possible to provide the reflective screen 20 that can display a bright and good image with high contrast even in a bright room environment.
Further, according to the present embodiment, as in the first embodiment, the above-described excellent reflective screen 20 is coated with a reflective material or a light absorbing material on the lens surface and non-lens surface of a fine unit lens. It can be easily manufactured without going through complicated steps. Accordingly, it is possible to reduce working time and production cost.
Furthermore, according to this embodiment, a reflection part and a light absorption part can be continuously formed using a web-like base material layer and a lens layer, and mass production can also be easily performed.

(Deformation)
Without being limited to the embodiments described above, various modifications and changes are possible, and these are also within the scope of the present invention.
(1) In each embodiment, an example in which a linear Fresnel lens shape is formed on the back surface side of the lens layer 12 of the reflection screens 10 and 20 is shown, but the present invention is not limited thereto, and for example, the unit lenses 121 are concentrically formed. It is good also as a lens layer in which the arranged circular Fresnel lens shape was formed.

(2) In each embodiment, although the reflective screens 10 and 20 showed the example provided with the base material layer 11, the lens layer 12, the reflection parts 13 and 23, the light absorption parts 14 and 24, the surface functional layer 15, etc., Not limited to this, for example, a light diffusing layer containing a diffusing material that diffuses light, a glass or resin substrate layer for enhancing the rigidity of the reflecting screen and maintaining flatness, and coloring for improving contrast It is good also as a form provided with the layer.

(3) In each embodiment, although the reflective screens 10 and 20 were joined to the support plate 50 provided in the back side via the adhesive material layer etc., and the example which is substantially flat form was shown, it does not restrict to this. For example, it is good also as a form joined to a wall surface via an adhesive material layer etc.
Moreover, in each embodiment, although the reflective screens 10 and 20 showed the example which is substantially flat form in a use condition and a non-use state, it was not restricted to this, The form which can be wound up and can be stored when not in use It is good. In the case of such a configuration, the support plate 50 or the like is not provided, and the back side of the reflective screens 10 and 20 is covered with a cloth or resin light-shielding curtain that hardly transmits light or a protective layer that improves scratch resistance. It is good also as a form.

(4) In each embodiment, the unit lens 121 has an example in which the lens surface 121a, the top surface 121b, and the non-lens surface 121c are all flat. However, the present invention is not limited to this. For example, at least one surface is provided. It may be a curved surface, or a part of any surface may be a curved surface or the like. For example, in the second embodiment, when the top surface 121b is a concave curved surface, the coating film is stably formed when the light absorbing material is applied on the top surface 121b, and the coating property is improved.
Further, the lens surface 121a, the non-lens surface 121c, and the like are configured from a plurality of surfaces, and the cross-sectional shape of the cross section orthogonal to the sheet surface and parallel to the arrangement direction of the unit lenses is, for example, a substantially pentagonal prism shape, It is good also as a shape used as a substantially hexagonal column shape.

(5) In each embodiment, in the usage state of the reflection screens 10 and 20, the main incident direction of the image light is from below the reflection screen 10, and the unit lens 121 has the same cross section in the horizontal direction of the screen (horizontal direction). The example extends in the shape and is arranged in a large number in the vertical direction of the screen (vertical direction), but is not limited to this, for example, when the main incident direction of the image light is the top of the screen, What is necessary is just to make it the form which turned the reflection screens 10 and 20 of embodiment upside down.

(6) In each embodiment, the example in which the lens layer 12 is integrally formed on one surface of the base material layer 11 by ultraviolet molding has been shown. However, the present invention is not limited to this. For example, the lens layer may be formed by extrusion molding. Good. At this time, if the lens layer 12 has a sufficient thickness, the base material layer 11 may not be provided, or the lens layer 12 and the base material layer 11 may be extruded and molded together. Thereby, mass production becomes easier and can be provided at low cost.

(7) In 1st Embodiment, although the reflection part 13 showed the example which is not formed on the top surface 121b, it is not limited to this, If it is very thin thickness, it is formed on the top surface 121b. Also good. In such a case, a part of the light (mainly external light or stray light) incident on the top surface 121b may be reflected, but most of the light is absorbed by the light absorbing portion, and a reduction in contrast can be suppressed. In addition, the manufacturing becomes easier and the working time can be reduced.

(8) In each embodiment, the video display system including the reflective screens 10 and 20 and the video source LS is shown. However, the present invention is not limited to this, and for example, a control unit such as a personal computer or a reflective screen touched by a user. It is also possible to provide an interactive board system that includes a position detection device that detects positions on the 10 screens, and that enables the position detection device and the video source to communicate with a control unit such as a personal computer. In such a form, for example, information such as characters and figures drawn by the user on the observation screen of the reflective screen 10 with a touch pen, a finger, and the like is combined with the projection image, and the figures and characters are displayed on the projection image. It can be displayed as drawn, or a projection image including such information can be converted into data and stored.
Moreover, the reflective screen 10 draws information, such as a character and a figure, by handwriting on the surface (observation screen) using a predetermined writing instrument such as a marker, such as a general white board, or the like. Or can be deleted.

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

DESCRIPTION OF SYMBOLS 10,20 Reflective screen 11 Base material layer 12 Lens layer 13,23 Reflection part 14,24 Light absorption layer 15 Surface functional layer LS Image source

Claims (7)

A reflection screen that reflects the image light projected from the image source and displays the image light so as to be observable;
A lens layer having a Fresnel lens shape with a plurality of unit lenses arranged on the back side,
The unit lens is
Convex on the back side, the shape of the cross section parallel to the direction orthogonal to the screen surface parallel to the arrangement direction of the unit lenses is a substantially square shape,
A top surface serving as a top portion of the unit lens, a lens surface facing the top surface across the top surface, and a non-lens surface,
The lens surface is colored silver and has a reflecting portion that reflects light,
The top surface is formed with a light absorbing portion that absorbs light,
An adhesive layer is provided on the most back side in the thickness direction of the reflective screen;
Reflective screen featuring. The reflective screen according to claim 1.
The reflection part is formed so as to fill a valley between the unit lenses;
Reflective screen featuring. The reflective screen according to claim 1 or 2,
The lens layer is made of an ionizing radiation curable resin, and is formed integrally with a base material layer provided on the image source side from the lens layer.
Reflective screen featuring. The reflective screen according to any one of claims 1 to 3,
The top surface is formed in a concave curved surface;
Reflective screen featuring. The reflective screen according to any one of claims 1 to 4, wherein:
The reflecting portion covers the lens surface and the non-lens surface, and the back side of the light absorbing portion formed on the top surface;
Reflective screen featuring. The reflection screen according to any one of claims 1 to 5,
A flat support plate is joined by the adhesive layer,
Reflective screen featuring. The reflection screen according to any one of claims 1 to 5,
The light-shielding curtain or protective layer is joined by the adhesive material layer,
Reflective screen featuring.

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