JP5189372B2 - Reflective screen - Google Patents

Description

  The present invention relates to a translucent sheet having a light-shielding pattern, and a reflective screen using the same, and more particularly to a reflective screen suitable when an image is irradiated obliquely from below.

  2. Description of the Related Art Conventionally, projectors that use liquid crystal and DMD (Digital Micro mirror Device) as video sources have been widely used. In particular, a front projector that projects image light on the front surface of a screen is widely used because it has an advantage that the image projection size can be easily increased to a diagonal size of 100 inches or the like.

  In recent years, front projectors have been used in various projection arrangements. FIG. 8 shows an example of the projection arrangement. As shown in FIG. 8, the front projector 92 is often arranged on a desk, and the screen 91 is positioned above the height of the desk so that the screen 91 does not become a shadow of the desk when viewed from the observer. doing. That is, the lower end of the screen 91 is positioned at the height of the desk. Therefore, the projection optical axis 93 of the front projector 92 is at a position biased below the screen 91. Further, the position of the projection system optical axis 93 may be outside the screen 91.

  Furthermore, a front projector that irradiates an image at a steep angle from an obliquely lower side is also used so that a large screen can be viewed even in a narrow room. For example, a liquid crystal projector having a 4: 3 horizontal and vertical screen and a projection optical axis below the screen has been developed. In this liquid crystal projector, the projection angle is about 8 degrees at the lower end and about 50 degrees at the upper end with respect to the perpendicular.

These front projectors have the disadvantage that when viewed in a bright room, external light is reflected on the screen surface and the contrast of the image is poor.
An example of a screen for improving this point is disclosed in Patent Document 1. The screen disclosed in Patent Literature 1 has a blind screen-like (louver-like) light shielding layer provided inside the screen.

  In a screen provided with such a light-shielding pattern, the pitch of the light-shielding pattern interferes with the pixel pitch of the video image, which may cause moiré failure. In general, in order to avoid a moire failure, a pitch in a specific range is selected so that one pitch and the other pitch do not have a simple integer multiple ratio, or the other pitch is, for example, 6 times or more of one pitch. Measures such as setting to etc. are taken. However, when projecting an image onto a screen using a projector, the number of pixels in the image varies depending on the projector model, and there are many projectors that can change the projection size. It is difficult to do. In addition, if the pitch of the light shielding pattern is large, there may be a problem in the precision of the image. Therefore, in order to avoid a moire failure, it is necessary to set the pitch of the light shielding pattern to a fraction of the pixel pitch. For example, when the vertical pixel pitch is about 480 columns on a screen with a horizontal and vertical ratio of 4: 3 and a diagonal size of 60 inches and the vertical pixel pitch is about 2 mm, the preferred pitch of the light shielding pattern is 0. 3 mm or less. In recent years, the pixel pitch is sometimes smaller due to the trend toward higher definition, and the more preferable pitch of the light shielding pattern is 0.2 mm or less. However, it is difficult to form the louver-like light shielding layer disclosed in Patent Document 1 on a large screen with a fine pitch.

  An example of a technique for forming a light shielding layer having a shape similar to a louver shape on a large screen at a fine pitch is disclosed in Patent Document 2. The screen disclosed in Patent Document 2 is provided with a light shielding layer having a wedge-shaped cross section in the screen. As a method of manufacturing a light shielding layer having a wedge-shaped pattern, for example, in Patent Document 3, a sheet provided with a V-shaped groove on the surface is transferred and molded using a mold provided with a wedge-shaped projection, and then the groove portion is formed. A method of filling a light shielding material is disclosed.

  However, the techniques of Patent Document 1 and Patent Document 2 improve the contrast when image light is irradiated from the front direction of the screen, and the image light is dark when the image is irradiated obliquely from below as described above. There is a problem to say.

In order to deal with this problem when the image is irradiated obliquely from below, it is conceivable that the wedge-shaped pattern is inclined obliquely downward as shown in FIG. In the reflective screen 94 shown in FIG. 9, a plurality of light shielding layers 96 in which wedge-shaped patterns are inclined obliquely downward are arranged in contact with the reflective layer 97 in the light shielding pattern layer 95. However, considering the step of releasing the molded product from the mold, it is difficult to mold an extremely inclined shape.
Japanese Patent Laid-Open No. 03-098038 JP 2006-301588 A JP 2006-178092 A

  As described above, in order to improve the contrast when irradiating an image from obliquely below, a translucent sheet having an obliquely inclined louver-like light-shielding layer that is easy to manufacture is desired. There is also a need for a reflective screen that is suitable for illuminating an image from below and is excellent in external light contrast.

  One aspect of the transparent sheet according to the present invention is a translucent sheet having a light shielding pattern layer extending in a horizontal direction, and the light shielding pattern layer includes a plurality of light shielding layers having a triangular cross section, The triangular shape includes at least a lower surface, an upper surface, and a bottom surface, the lower surface is disposed substantially perpendicular to the sheet surface, the bottom surface is disposed non-parallel to the sheet surface, and is disposed outside the bottom surface. Further includes a light-transmitting layer, and the surface of the light-transmitting layer is flat. By forming a triangular light shielding layer in the light shielding pattern layer, a function similar to that of an obliquely inclined louver is realized.

  One aspect of the reflective screen according to the present invention is a reflective screen in which a reflective layer is disposed on the back side, and includes a light shielding pattern layer extending in the horizontal direction, and the light shielding pattern layer has a triangular cross section. The triangular shape includes at least a lower surface, an upper surface, and a bottom surface, and the lower surface is disposed substantially perpendicular to a screen surface, and the bottom surface includes the light-transmitting layer. A non-parallel arrangement with respect to the screen surface, a translucent layer having a flat back surface is disposed outside the bottom surface, the reflective layer is disposed on the back side of the translucent layer, and the bottom surface and the top surface Is in contact with the reflective layer, and a translucent layer exists between the vicinity of the intersection of at least the bottom surface of the bottom surface and the reflective layer. The reflective screen using the above-described transparent sheet realizes the same function as a louver whose upper surface is inclined obliquely, and therefore is suitable for illuminating an image from obliquely below and provides a screen with excellent external light contrast. be able to.

  In one aspect of the reflective screen according to the present invention, an angle formed between the lower surface and the screen surface is preferably 85 ° or more and 95 ° or less. Moreover, it is preferable that the angle which the said upper surface and the said screen surface make is 30 degrees or more and 85 degrees or less. Furthermore, the angle formed by the bottom surface and the screen surface is preferably 5 ° or more.

  One aspect of a method for producing a transparent sheet according to the present invention is a method for producing a translucent sheet having a light shielding pattern layer extending in the horizontal direction, and includes a lower surface substantially perpendicular to the sheet surface, A step of forming a transparent concavo-convex pattern layer having a plurality of concave portions each having an upper surface adjacent to the lower surface at one end; filling the concave portions with a light shielding material; and being non-parallel to the lower surface, the upper surface, and the sheet surface And a process of forming a transparent resin layer on the outside of the bottom surface. A transparent sheet can be easily manufactured by making a translucent sheet | seat provided with the louver-like light shielding layer slanting diagonally into the same inclination as a louver, and making a lower surface substantially perpendicular | vertical to a sheet | seat surface.

  According to one aspect of the translucent sheet of the present invention, an obliquely inclined louver-like light shielding layer can be easily produced. Moreover, according to one aspect of the reflective screen of the present invention, it is possible to provide a reflective screen that can be easily manufactured, is suitable for irradiating an image from obliquely below, and has excellent external light contrast.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. In the drawings, components having the same configuration or function and corresponding parts are denoted by the same reference numerals, and description thereof is omitted. X to Y (X and Y are numerical values) mean X or more and Y or less.

(Embodiment 1)
Hereinafter, the translucent sheet and the reflective screen of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a cross section of an example of the screen of the present invention. FIG. 1 shows a cross section perpendicular to the horizontal direction of the reflective screen 10. As shown in the drawing, the reflective screen 10 extends in the horizontal direction, and a plurality of light shielding layer 12 patterns having a triangular cross section (substantially triangular) are arranged between the translucent layers 11 in the vertical direction. A reflective layer 13 is provided on the side. Here, a surface facing the reflective layer 13 and on which the image light is incident is referred to as an incident surface 14. A surface parallel to the reflective layer 13 or the incident surface 14 is referred to as a sheet surface or a screen surface. Further, the light transmitting layer 11 and the light shielding layer 12 are referred to as a light shielding pattern layer 15.

  FIG. 2 is a diagram illustrating an arrangement example of the light shielding layer 12 and the reflective layer 13. As shown in FIG. 2, the light shielding layer 12 having a substantially triangular cross section includes an upper surface, a lower surface, and a bottom surface. For convenience of explanation, the intersection of the top surface and the bottom surface is called vertex 1. Similarly, the intersection between the upper surface and the lower surface is called vertex 2, and the intersection between the lower surface and the bottom surface is called vertex 3.

  In the reflective screen 10 of the present invention, the apex 2 of the triangle is directed to the observation side (incident surface 14 side), and the bottom surface is directed to the reflective layer 13 side. With such a configuration, as shown in FIG. 3, the light shielding layer exhibits the same function as an obliquely downward louver. In order to explain that the operation is the same as that of the louver 9, the louver 9 is indicated by a thick line in FIG.

  Next, a method for forming a light shielding layer pattern as shown in FIGS. 1 and 2 will be described with reference to FIGS. FIG. 4 is a diagram illustrating an example of a manufacturing process of the reflective screen according to the present embodiment.

  First, the translucent sheet 20 shown in FIG. 4A in which quadrangular convex portions are arranged is manufactured. FIG. 4A shows an example in which a transparent concavo-convex pattern layer 22 in which square convex portions are arranged on one side of a transparent base sheet 21 is formed by a mold and a first ultraviolet curable resin. As the shape of the mold, a shape in which the shape connecting the vertex 1 to vertex 2 to vertex 3 of the light shielding layer 12 shown in FIG. 2 is repeated is used. It can be said that the concave portion has a shape composed of a lower surface substantially perpendicular to the sheet surface and an upper surface that is non-parallel to the lower surface and has one end adjacent to the lower surface.

  Next, as shown in FIG. 4B, the light shielding material is filled only in a region that is a part of the concave portion on the transparent uneven pattern layer 22 side of the translucent sheet 20 and becomes the triangular light shielding layer 12. As the filling method, for example, a wiping method (hereinafter, scraping printing) as disclosed in Patent Document 3 can be employed. At this time, for example, by using a rubber squeegee having high flexibility such as a rubber hardness of 90 or less as a scraping tool, only a triangular region connecting the vertex 1, vertex 2 and vertex 3 is filled with a light shielding material, and other concave portions are used. It is possible not to fill a region connecting the vertex 1, the vertex 3 and the adjacent vertex 1 with a light shielding material.

  Thereafter, a second ultraviolet curable resin is applied to the light-shielding pattern layer side of the translucent sheet 20, and a hard scraper such as a metal blade is used. As shown in FIG. Only the region connecting the vertex 3 and the adjacent vertex 1 is filled with resin and cured. The light shielding pattern layer side of the translucent sheet 20 is the side where the light shielding layer 12 is formed on the translucent sheet 20, and refers to the side opposite to the transparent substrate sheet 21. In this way, the transparent resin layer 23 is formed.

  The translucent sheet | seat 20 provided with the louver-like light shielding layer 12 inclined diagonally by the above process can be manufactured easily. When not used as a screen, a light transmissive layer may be provided outside the vertex 1.

  Thereafter, as shown in FIG. 4D, a metal thin film or a light diffusing agent-containing resin is laminated on the light-shielding pattern layer side of the translucent sheet 20 provided with the louver-like light-shielding layer 12 to form the reflective layer 13. To do. FIG. 4E shows the state of the manufactured reflective screen.

  Through the above steps, the reflective screen 10 including the triangular light shielding layer of the present invention can be manufactured.

  If the second ultraviolet curable resin is used as a transparent adhesive and a light-reflective sheet is laminated, the steps shown in FIGS. 4C and 4D can be performed at a time. For example, after applying the second ultraviolet curable resin to the light-shielding pattern layer side of the translucent sheet, a sheet on which a reflection layer is formed in advance is laminated and nipped, and a region other than the region connecting the vertex 1, vertex 3 and the adjacent vertex 1 The ultraviolet curable resin can be eliminated and laminated, and then the ultraviolet curable resin can be cured.

  In the reflective screen 10 of the present invention, the vertex 1 of the triangular light shielding layer 12 needs to be in contact with the reflective layer. If there is a light-transmitting layer between the vertex 1 and the reflective layer 13, the image light enters the adjacent light-transmitting part across the triangular light-shielding layer 12 and loses the clearness of the image.

  Next, the triangular shape of the light shielding layer 12 will be described. FIG. 5 is a diagram illustrating the shape of the light shielding layer 12. For the sake of explanation, when two light shielding layers 12 are shown and the two are distinguished, they will be described as 12a and 12b as shown in FIG. An angle θ2 formed by the lower surface of the triangular light shielding layer 12 with respect to the screen surface (sheet surface) needs to be approximately 90 degrees (substantially perpendicular to the screen surface). For example, θ2 is not less than 85 degrees and not more than 95 degrees. If it is smaller than this, a problem will arise in the moldability and releasability of the transparent uneven pattern layer 22. If it is larger than this, it will be difficult for the light shielding layer 12 to exhibit the same function as the obliquely downward louver 9.

  The angle θ1 formed by the upper surface of the triangular light shielding layer 12 with respect to the screen surface is preferably 30 degrees or more and 85 degrees or less. If it is smaller than this, the image may become dark when image light is irradiated from the front of the screen. If it is larger than this, the angle formed by the upper surface and the lower surface (the angle of the top portion 2) becomes too small, which may cause a problem in the durability of the mold.

  The angle θ3 formed by the bottom surface of the triangular light shielding layer 12 with respect to the screen surface is preferably 5 degrees or more. If it is smaller than this, it will be difficult for the light shielding layer 12 to exhibit the same effect as the obliquely downward louver 9.

  Also, in scraping printing, if the squeegee pressing pressure is increased or the squeegee is softened to sufficiently eliminate the light shielding material in the region connecting the vertex 1 and vertex 3 of the light shielding layer 12a and the vertex 1 of the adjacent light shielding layer 12b. A part of the squeegee comes into contact with the upper surface in the vicinity of the vertex 1. Then, since there is a possibility that even the light shielding material near the apex 1 of the triangular area connecting the apex 1, the apex 2 and the apex 3 will be excluded, θ3 is (θ1-5) degrees or less, in other words, the angle of the apex 1 is 5 degrees. The above is preferable.

  An angle θ4 formed by a line connecting the vertex 3 and the adjacent vertex 1 with respect to the screen surface is preferably 5 degrees or more and 45 degrees or less. If it is smaller than this, it will be difficult for the light shielding layer 12 to exhibit the same effect as the obliquely downward louver 9. If it is larger than this, the shading material in the triangular region connecting the vertex 1, vertex 2 and vertex 3 is selectively left in scraping printing, and the light shielding material in the region connecting the vertex 1, vertex 3 and the adjacent vertex 1 is sufficiently excluded. It becomes difficult.

Further, if the optical properties (for example, refractive index) of the transparent base sheet 21 and the first and second UV curable resins after curing are matched, these boundaries are optically eliminated, so that optical design is easy. There is an advantage of becoming. Here, the 1st ultraviolet curable resin forms the transparent uneven | corrugated pattern layer 22 of FIG. 4, and the 2nd ultraviolet curable resin points out what forms the transparent resin layer 23 of FIG. Hereinafter, when the refractive index of the ultraviolet curable resin is described in the present specification, it means the refractive index of the cured resin unless otherwise specified.
The refractive index of the first ultraviolet curable resin may be higher than the refractive index of the light shielding material. The refractive index of the first ultraviolet curable resin may be different from the refractive index of the second ultraviolet curable resin.

  FIG. 6 shows how external light is absorbed. This figure shows an enlarged view of a screen cross section and a ray path through which external light passes through the screen. In the drawing, the refractive index of the first ultraviolet curable resin is higher than the refractive index of the light shielding material, and the refractive index of the second ultraviolet curable resin is the same as the refractive index of the light shielding material.

  The external light 1 is a light beam that is irradiated on the screen from a relatively high position. After the external light 1 is refracted on the incident surface, it is incident on the triangular upper surface of the light shielding layer 12 and is shielded.

  The external light 2 is a light beam that is irradiated onto the screen from above, which is relatively close to the front direction. After the external light 2 is refracted on the incident surface, it enters the upper surface of the triangle of the light shielding layer 12. Here, taking into account that the refractive index of the first ultraviolet curable resin is higher than the refractive index of the light shielding material, when the light enters the upper surface of the triangle of the light shielding layer 12 at an angle smaller than the critical angle, the light is shielded similarly to the external light 1. Is done. On the other hand, when it is incident on the upper surface of the triangle of the light shielding layer 12 at an angle larger than the critical angle, it is totally reflected at the interface. The totally reflected external light 2 is repeatedly reflected between the triangular upper surface of the light shielding layer 12 and the triangular lower surface of the light shielding layer 12, so that the incident angle to the interface of the light shielding layer 12 gradually becomes smaller. Shaded.

The external light 3 is a light beam that is irradiated onto the screen from the upper side, which is relatively close to the front direction, like the external light 2. Unlike the external light 2, the external light 3 is reflected directly or after being reflected at the interface of the light shielding layer 12, and then the reflective layer 13. The ray path that reached is shown. In the present invention, since there is a translucent layer between the triangular bottom surface of the light shielding layer 12 and the reflective layer 13, the external light 3 reaches the triangular bottom surface of the light shielding layer 12 and is shielded from light. In addition, since one end of the triangular bottom surface of the light shielding layer 12 is in contact with the reflective layer 13, external light is shielded without reaching the adjacent light transmitting layer 11.
As described above, the reflective screen 10 of the present invention can effectively shield external light from obliquely above.

  Next, a state in which the image light is reflected will be described with reference to FIG. The figure shows an enlarged view of a screen cross section and a light beam path through which image light passes and reflects through the screen. For example, the refractive index of the first ultraviolet curable resin is 1.6, and the refractive indexes of the light shielding material and the second ultraviolet curable resin are 1.5. Θ1 is 78 degrees, θ2 is 90 degrees, and θ3 is 10 degrees.

  The image light 1 is an image light incident on the screen surface at an incident angle of 30 degrees. At this time, the image light 1 is refracted at a refraction angle of about 18 degrees on the screen incident surface 14 and is incident on the triangular lower surface of the light shielding layer 12. Since the triangular lower surface of the light shielding layer 12 is perpendicular to the screen surface, the image light 1 enters the lower triangular surface of the light shielding layer 12 at an incident angle of about 72 degrees. Since the critical angle is about 70 degrees at the interface where the refractive index changes from 1.6 to 1.5, the image light 1 is totally reflected, further reflected by the reflective layer 13, and then reflected to the observation side. In this case, the image light 1 does not enter the triangular upper surface of the light shielding layer 12 directly.

  The image light 2 is an image light beam incident on the screen surface at an incident angle of 15 degrees. The image light 2 is refracted at a refraction angle of about 9 degrees on the screen incident surface, and is also incident on the triangular upper surface of the light shielding layer 12. The incident angle on the upper surface of the triangle is about 87 degrees, and the light is totally reflected. Thereafter, the light is reflected by the reflective layer 13 and is incident at an incident angle of about 75 degrees on the triangular lower surface of the adjacent light shielding layer 12, so that it is totally reflected and reflected to the observation side.

The image light 3 is a light beam radiated on the screen from obliquely below, but directly enters the reflection layer 13.
It is a light beam that has reached the triangular bottom surface of the light shielding layer 12. Although the image light 3 is not reflected to the observation side, since the ratio is relatively small, the attenuation of the image light is small.

  As described above, since the image light incident from the front direction of the screen is reflected without being relatively attenuated and the outside light is relatively largely attenuated as the entire screen, a bright and excellent image can be provided.

(Other embodiments)
In the first embodiment, as an example of the triangular light shielding layer 12, a triangle having an upper surface, a lower surface, and a bottom surface has been described. However, the present invention is not limited to this. The triangular shape in the present invention has a triangular shape as a basic shape, but its side may be slightly curved or polygonal. Moreover, a viewing angle can be adjusted by combining these. Further, there may be a flat portion or a rounded chamfered portion such as a triangular tip. As described above, the triangular shape of the light shielding layer 12 only needs to be configured from at least the upper surface, the lower surface, and the bottom surface, and each surface includes the shape described above and does not necessarily have to be a triangle having three vertices.

Also, the vicinity of the intersection of two surfaces, such as the vicinity of the intersection of the lower surface and the bottom surface of the triangle, includes the vicinity of the vertex formed by the two surfaces and the vicinity of the portion where the two surfaces are adjacent.
Further, in the reflective screen 10, a part of the light shielding layer 12, specifically, at least one of the top and bottom surfaces of the light shielding layer 12 is in contact with the reflective layer 13, and the light transmissive layer 11 in contact with the reflective layer 13 is formed by the light shielding layer 12. It is necessary to be divided.

The reflective layer 13 is preferably a specular reflection. If the diffusibility is too large, the components of the image light and the outside light that do not pass through the path as shown in FIGS. 6 and 7 increase, so that the brightness and contrast performance may be insufficient.
The surface closest to the observation side is preferably provided with an antiglare function and an antireflection function. It is possible to prevent the image light from being reflected by the incident surface 14 and becoming dazzling.

  The pitch of the light shielding pattern is preferably in the range of 0.03 mm to 0.3 mm. If it is larger than this, there may be a noticeable moire failure caused by interference between the pixel pitch on the screen surface of the projected image and the pitch of the light shielding pattern. If it is smaller than this, it is difficult to manufacture the light shielding pattern with high accuracy.

  The translucent sheet of the present invention can be produced by a known method in addition to the so-called 2P molding method using the above-described ultraviolet curable resin, for example, an extrusion production method using a thermoplastic resin, or a method of hot pressing a substrate sheet Etc. can be adopted. In addition, a diffusing material may be mixed in the light-transmitting sheet in an amount of 0.1 to 10% by weight for the purpose of making the molding unevenness inconspicuous.

  As the light shielding material, an ultraviolet curable ink, a thermosetting ink, or the like in which carbon particles, a pigment, a dye or the like is mixed can be used. When the translucent sheet of the present invention is used as a viewing angle control sheet or the like and does not require external light absorption performance, an ink containing, for example, a white pigment other than black can be used as a light shielding material.

A metal vapor deposition film etc. can be employ | adopted as a reflection layer, for example, what laminated | stacked aluminum on the polyethylene terephthalate-type resin film can be laminated | stacked and used for a translucent sheet | seat.
A backing layer may be provided on the back side of the reflective layer. For example, a soft vinyl chloride sheet is preferable in terms of flame retardancy and less surface damage due to rubbing when wound and stored.

As described above, according to a preferred embodiment of the present invention, it is possible to provide a translucent sheet provided with a louver-like light shielding layer inclined obliquely by a simple manufacturing method. In addition, a reflective screen that is bright and excellent in external light contrast can be provided using the translucent sheet. In particular, the preferred reflective screen of the present invention is such that image light irradiated from obliquely below the screen can be reflected to the viewer side without significant attenuation, while outside light incident from above is blocked by a light shielding layer. Excellent contrast.
In each of the above embodiments, in order to facilitate the explanation of the configuration of the transparent sheet or the reflective screen, the arrangement of the transparent sheet in which the light shielding pattern layer having a plurality of triangular light shielding layers extends in the horizontal direction is used. Explained. However, in the transparent sheet (or reflective screen), the direction in which the transparent sheet is arranged may be different if the relationship between the light shielding layer and the sheet surface is the same as in the above embodiments.

  In addition, this invention is not limited to embodiment shown above. Within the scope of the present invention, it is possible to change, add, or convert each element of the above-described embodiment to a content that can be easily considered by those skilled in the art.

It is the schematic which showed the cross section of an example of the screen of this invention. It is a figure which shows the example of arrangement | positioning of a light shielding layer and a reflection layer. It is a figure which shows a mode that a light shielding layer exhibits the effect | action similar to a louver. It is a figure which shows an example of the manufacturing process of the reflection type screen of this embodiment. (A) is a step of manufacturing a translucent sheet, (b) is a step of filling a light shielding material and forming a light shielding layer, (c) is a step of filling a transparent resin layer outside the light shielding material, (d) (E) is a figure which shows the completed state, the process of forming the reflective layer. It is a figure explaining the shape of a light shielding layer. It is a figure which shows a mode that external light is absorbed in the reflective screen of this embodiment. It is a figure which shows a mode that image light is reflected in the reflective screen of this embodiment. It is a figure which shows an example of projection arrangement | positioning. It is a figure which shows an example of the light shielding layer which inclines a wedge-shaped pattern diagonally downward.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reflective type screen 11 Translucent layer 12, 12a, 12b Light-shielding layer 13 Reflective layer 14 Incident surface 15 Light-shielding pattern layer 20 Translucent sheet 21 Transparent base material sheet 22 Transparent uneven | corrugated pattern layer 23 Transparent resin layer

Claims (4)

A reflective screen with a reflective layer on the back side,
With a light shielding pattern layer extending in the horizontal direction,
The light-shielding pattern layer includes a plurality of light-shielding layers having a triangular cross section, and a light-transmitting layer,
The light shielding layer is composed of at least a lower surface, an upper surface, and a bottom surface,
The lower surface is disposed substantially perpendicular to the screen surface;
The bottom surface is disposed non-parallel to the screen surface;
A light-transmitting layer having a flat back surface is disposed outside the bottom surface,
The reflective layer is disposed on the back side of the translucent layer,
A portion of at least one of the bottom surface and the top surface is in contact with the reflective layer;
A reflective screen in which a translucent layer exists between the vicinity of the intersection of at least the bottom surface of the bottom surface and the reflective layer. Reflection screen according to claim 1, wherein the angle between the lower surface and the screen surface is is 85 ° to 95 °. The reflective screen according to claim 2 , wherein an angle formed by the upper surface and the screen surface is 30 ° or more and 85 ° or less. The reflective screen according to claim 2 or 3 , wherein an angle formed by the bottom surface and the screen surface is 5 ° or more.

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