Slats, blinds, and projection systems

Abstract

To provide a blind that can display bright, high-contrast images, a slat that can form the blind, and a projection system that can display bright, high-contrast images.SOLUTION: A slat 12 includes a slat body 12a, triangular prism-shaped protrusions 126 which individually have a bottom surface fixed to at least one surface of the slat body 12a, one surface inclined relative to the normal direction of the one surface of the slat body 12a, and another surface inclined in a direction different from the direction in which the one surface inclines relative to the normal direction of the one surface of the slat body 12a, and are arranged along the extension direction of the slat body 12a and arranged in a row in a direction intersecting the extension direction, reflective layers 128 formed on one surface to reflect incident light and absorbing layers 127 formed on the other surface to absorb incident light.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to slats, blinds, and projection systems.

Background Art

[0002] There is a screen composed of a window blind for projecting image light emitted from a projector. For example, Patent Document 1 discloses a window blind that can be used as a screen. This window blind has a configuration in which a polarizing film is laminated on the surface of the slat body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the image light emitted from the projector is projected onto this window blind, the image has problems of being dark and having low contrast. This is because the image light is attenuated by the polarizing film.

[0005] The present invention has been made in view of the above circumstances. That is, an object of the present invention is to provide a blind capable of displaying a bright and high-contrast image, a slat capable of constituting this blind, and a projection system capable of displaying a bright and high-contrast image.

Means for Solving the Problems

[0006] The present invention is as follows. [1] The slat according to the present invention is a slat body, and A bottom surface fixed to at least one surface of the slat body, one surface inclined with respect to the normal direction of one surface of the slat body, and another surface inclined in a direction different from the direction in which the one surface inclined with respect to the normal direction of one surface of the slat body, and a plurality of triangular prism-shaped protrusions provided along the extending direction of the slat body and arranged in a line in a direction intersecting the extending direction, A reflective layer formed on one of the aforementioned surfaces, which reflects incident light, The device comprises an absorbing layer formed on the other surface which absorbs incident light.

[0007] [2] The slat body has a shape that is bent along a reference line parallel to the extending direction of the slat body, and one surface of the slat body has a first region and a second region on either side of the reference line, and a plurality of the triangular prism-shaped protrusions may be provided in the first region.

[0008] [3] The blind according to the present invention comprises the slats described in [1] or [2].

[0009] [4] The projection system according to the present invention is A projector that emits image light, The system comprises a blind as described in [3] that projects the image light emitted from the projector as an image. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a blind capable of displaying bright, high-contrast images, slats that can constitute this blind, and a projection system capable of displaying bright, high-contrast images. [Brief explanation of the drawing]

[0011] [Figure 1] This is a front view of a blind according to an embodiment in the closed state. [Figure 2] This is a side view of a blind according to an embodiment in the open state. [Figure 3] (a) is a plan view of the slat according to the embodiment, and (b) is a sectional view taken along the line Ia-Ia of (a). [Figure 4] It is a side view of the blind according to the embodiment. [Figure 5] (a) is a plan view of the slat according to the embodiment, and (b) is a sectional view taken along the line Ib-Ib of (a). [Figure 6] It is a sectional view showing a modification of the slat according to the embodiment. [Figure 7] It is a side view of the projection system according to the embodiment. [Figure 8] It is a side view of the projection system and the slat according to the embodiment. [Figure 9] It is a sectional view showing a modification of the slat according to the embodiment. [Figure 10] It is a sectional view showing a modification of the slat according to the embodiment.

Mode for Carrying Out the Invention

[0012] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "embodiment") will be described in detail. The embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following contents. The present invention can be appropriately modified and implemented within the scope of its gist.

[0013] (Blind) As an example of the blind used in the embodiment, a loop cord type blind that performs the raising / lowering and angle adjustment of the slats with a single operating cord will be described with reference to the drawings. A front view of the blind in the closed state is shown in FIG. 1. A side view of the blind in the opened state is shown in FIG. 2.

[0014] Hereinafter, in the figures, for the sake of easy understanding of the configuration, the x-axis indicates the direction in which the slats extend, the y-axis indicates the direction in which the slats are arranged, and the z-axis indicates the direction orthogonal to the xy plane. The positive side in the x-axis direction is called the "right" side, the negative side in the x-axis direction is called the "left" side, the positive side in the y-axis direction is called the "upper" side, the negative side in the y-axis direction is called the "lower" side, the positive side in the z-axis direction is called the "inner" side or the "front" side, and the negative side in the z-axis direction is called the "outer" side or the "rear" side. These are merely for representing the relative positional relationship of each part and do not limit the absolute positional relationship of each part. Also, the same members are denoted by the same reference numerals.

[0015] As shown in FIGS. 1 and 2, the blind 10 includes a head box 11 attached to a window frame 1 provided with a window glass 2, a plurality of slats 12 each having an elongated and thin plate-like shape in the extending direction, a ladder cord pair 13 that supports the slats 12 in a tilt-adjustable manner, a bottom rail 14 located below the lowermost slat 12, a lifting cord 19 that raises and lowers the plurality of slats 12, and an operation cord 17 that operates the tilt adjustment and lifting of the slats 12. The blind 10 may be attached to a ceiling, a curtain box, or a wall.

[0016] As shown in FIGS. 1 and 2, the plurality of slats 12 are arranged side by side in the y-axis direction and are supported in a tilt-adjustable manner by two ladder cord pairs 13 suspended from the head box 11. Note that the head box 11 may be provided with three or more ladder cord pairs 13.

[0017] The ladder cord pair 13 is composed of two ladder cords 13a and 13b as shown in FIG. 2. Between the two ladder cords 13a and 13b, a plurality of support threads (not shown) for supporting the slats 12 are provided at regular intervals in the y-axis direction. The plurality of slats 12 are supported by the support threads provided on the ladder cord pair 13 so as to be parallel to each other in the x-axis direction. A bottom rail 14 is disposed below the lowermost slat 12.

[0018] The bottom rail 14 is a heavy component used to stabilize the multiple slats 12 when lowering them, or after they have been lowered. The length of the bottom rail 14 in the x-axis direction and the width in the z-axis direction are the same as or greater than the length and width of the slats 12. When the bottom rail 14 is raised, the multiple slats 12 are stacked on top of the bottom rail 14.

[0019] The lower end of the ladder cord pair 13 is fixed to the bottom rail 14. Furthermore, the lower end of the lifting cord 19, which is fed out from the headbox 11, is fixed to the bottom rail 14. The headbox 11 contains multiple drums for winding up a lifting cord 19 (not shown) and a shaft that rotates the multiple drums in a synchronous manner. The headbox 11 also contains an operating device for adjusting the tilt and raising / lowering the slats 12. An operating cord 17, which is part of this operating device, extends from one end of the headbox 11.

[0020] When the operating cord 17 is pulled in one direction while the bottom rail 14 is lowered, the pulley constituting the operating device rotates, causing the drum that winds up the lifting cord 19 to rotate. As a result, the lifting cord 19 is wound onto the drum, and the bottom rail 14 rises. The multiple slats 12, which are in the lowered state, are lifted up so that they overlap each other as the bottom rail 14 rises. Also, when the operating cord 17 is pulled in another direction while the bottom rail 14 is raised, the pulley constituting the operating device rotates in the opposite direction, causing the drum that winds up the lifting cord 19 to rotate in the opposite direction, and the bottom rail 14 lowers. As a result, the multiple slats 12 supported by the ladder cord pair 13 lower together with the bottom rail 14.

[0021] Furthermore, when the operating cord 17 is pulled in one direction, the ladder cord 13a of the ladder cord pair 13 goes down and the ladder cord 13b goes up. As a result, the support thread installed between the ladder cords 13a and 13b tilts, and all the slats 12 supported by the support thread follow and tilt in one direction. Conversely, when the operating cord 17 is pulled in the other direction, the ladder cord 13a goes up and the ladder cord 13b goes down. As a result, the tilt of the support thread is reversed, and all the slats 12 tilt in the other direction.

[0022] As described above, the slats 12 can be tilted by pulling the operating cord 17 in one direction or the other. Also, as shown in Figure 1, after lowering the slats 12 together with the bottom rail 14, the blinds 10 can be fully closed by tilting the slats 12 to their maximum extent.

[0023] The loop cord type blind has been described above as an example of a blind that can be used in the embodiment. However, the blinds that can be used in the embodiment are not limited to the loop cord type blind. Any blind that can be used in the embodiment can be a blind that can be fully closed. Examples of blinds that can be used in the embodiment include a single-pole blind equipped with a pole that can raise and lower the slats and adjust the angle of the slats, and a cord and rod type blind equipped with a cord for raising and lowering the slats and an angle adjustment rod for adjusting the angle of the slats. A cord and rod type blind is also called a pole type blind. A single-pole blind is also called a multi-pole blind. A loop cord type blind is also called a chain type blind.

[0024] (Slat) The slat 12 in this embodiment is formed as a long, roughly rectangular plate. The slat 12 comprises a slat body 12a. The slat body 12a has a configuration in which a plurality of fine shapes are formed on at least one surface. The slat body 12a is made of, for example, a metal such as aluminum or stainless steel, wood, glass fiber reinforced plastic, or synthetic resin.

[0025] An example of the slat 12 will be described with reference to Figures 3, 4, and 5. The slat body 12a is, as a whole, elongated and formed in the shape of a roughly rectangular plate in plan view. As shown in Figures 3(a) and (b), the slat body 12a has a shape that is bent along a reference line BL parallel to the direction of extension. Here, "parallel" does not mean parallel in a strict sense, but rather parallel to the extent that the slat can perform its function according to the embodiment. Therefore, a deviation of approximately 0° (parallel) ±10° of the reference line BL with respect to the direction of extension of the slat body 12a, as well as errors in the reference line BL caused by distortion or warping of the slat body 12a, are within an acceptable range.

[0026] One surface of the slat body 12a has a first region 121 and a second region 122, separated by a reference line BL. The angle δ formed by the first region 121 and the second region 122 is, for example, 130° to 160°, from the viewpoint of suppressing the deflection of the slat body 12a.

[0027] The width W of the first region 121, that is, the length of the first region 121 in the direction perpendicular to the extending direction of the slat body 12a, is preferably the same length as or slightly shorter than the distance between the support threads provided between the ladder cords 13a and 13b. As a result, as shown in Figure 4, when the first region 121 is facing forward (positive z-axis direction), that is, when the blind 10 is fully closed, the first regions 121 are arranged almost without gaps in the y-axis direction. The arrangement of the first regions 121 without gaps forms a flat surface MS on the blind 10.

[0028] As shown in Figure 4, the second region 122 is positioned behind the main surface MS of the blind 10 so as to overlap the gap between the first region 121 of one slat body 12a and the first region 121 of another adjacent slat body 12a. This reduces the amount of solar radiation entering this gap. Therefore, the image projected onto the blind 10 is less affected by solar radiation and thus has superior contrast. It is desirable that the second region 122 be large enough to overlap the aforementioned gap.

[0029] Furthermore, as long as the slat body 12a has the above function, the first region 121 may be the same size as the second region 122, narrower than the second region 122, or wider than the second region 122. As shown in Figure 4, the slat body 12a is arranged such that the second region 122 is located above the first region 121. Within the limits that do not impair the function of the slat body 12a described above, the slat body 12a may be arranged such that the second region 122 is located below the first region 121.

[0030] As shown in Figure 5, a plurality of triangular prism-shaped protrusions 126 are provided in the first region 121. As shown in Figure 5(b), each triangular prism-shaped protrusion 126 comprises a bottom surface 123 fixed to the surface of the first region 121, one surface 124 inclined with respect to the normal direction of the first region 121, and the other surface 125 inclined in a direction different from the direction in which the one surface 124 is inclined with respect to the normal direction of the first region 121. As shown in Figures 5(a) and (b), the triangular prism-shaped protrusions 126 are provided along the extending direction of the slat body 12a, and a plurality of them are arranged side by side in a direction intersecting this extending direction.

[0031] In the projection system described later, the angle α between the bottom surface 123 and the one surface 124 is 45° or less in order to reflect the image light emitted from the projector on one surface 124. More specifically, the angle α is preferably between 35° and 45°, and more preferably between 38° and 42°. In addition, the angle β between the bottom surface 123 and the other surface 125 is 75° or more in order to absorb external light such as light from indoor lamps and stray light on the other surface 125. More specifically, the angle β is preferably between 75° and 85°, and more preferably between 75° and 82° from the viewpoint of improving processability. The width of the base surface 123 is 50 μm or more and 400 μm or less, and from the viewpoint of improving processability, it is desirable that it be 150 μm or more and 300 μm or less.

[0032] Examples of materials that can constitute the triangular prismatic protrusions 126 include thermoplastic resins, thermosetting resins, and energy-ray curable resins. Examples of thermoplastic resins include polypropylene resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic styrene resin, polyurethane resin, and urethane acrylate resin. Examples of thermosetting resins include epoxy resin and unsaturated polyester resin. Examples of energy-ray curable resins include urethane acrylate resin, acrylic acrylate resin, and epoxy acrylate resin. From the viewpoint of improving processability, polyurethane resin and urethane acrylate resin are preferable materials for constituting the triangular prismatic protrusions 126.

[0033] A reflective layer 128 that reflects incident light is formed on one surface 124. The reflective layer 128 may be formed over the entire surface 124, or it may be formed on a part of the surface 124. Furthermore, from the viewpoint of preventing the generation of emission lines, the reflective layer 128 may be formed on a part of the other surface 125, straddling the vertex formed by the surface 124 and the other surface 125.

[0034] The reflective layer 128 is composed of a resin composition containing a binder resin and a filler having the function of reflecting light. Examples of the binder resin include polypropylene resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic styrene resin, polyurethane resin, and urethane acrylate resin. From the viewpoint of dispersing the filler in the binder resin and strengthening the adhesion between the triangular prism-shaped protrusions 126 and the reflective layer 128, polyurethane resin is preferable as the binder resin. The filler is not particularly limited as long as it has the function of reflecting light, but examples include titanium dioxide, barium sulfate, hollow silica, hollow urethane, hollow acrylic, hollow styrene, barium chloride, and aluminum. From the viewpoint of efficiently reflecting the image light emitted from the projector and improving the contrast of the image, titanium dioxide is preferable as the filler. The shape of the filler is not particularly limited, but examples include spherical, needle-shaped, rod-shaped, plate-shaped, flake-shaped, and fibrous shapes. While there are no particular limitations on the average particle size of the filler, it is preferable that it be between 0.3 μm and 0.8 μm from the viewpoint of efficiently reflecting the image light emitted from the projector.

[0035] An absorbing layer 127 is formed on the other surface 125 to absorb external light such as light from indoor lamps and stray light. The absorption of external light by the absorbing layer 127 improves the contrast of the image. The absorbing layer 127 may be formed over the entire surface of the other surface 125, or it may be formed on a part of the other surface 125. The thickness of the absorbing layer 127 may be thinner at the edges of the other surface 125, as long as the function of the absorbing layer 127 is not impaired.

[0036] The absorption layer 127 is composed of a resin composition containing a binder resin and a filler having the function of absorbing light. Examples of binder resins include polypropylene resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic styrene resin, polyurethane resin, and urethane acrylate resin. From the viewpoint of dispersing the filler in the binder resin and strengthening the adhesion between the triangular prism-shaped protrusions 126 and the absorption layer 127, polyurethane resin is preferable as the binder resin. The filler is not particularly limited as long as it has the function of absorbing light, but examples include carbon black, perylene black, and black inorganic pigments. From the viewpoint of absorbing ambient light, carbon black is preferable as the filler. The shape of the filler is not particularly limited, but examples include spherical, needle-shaped, rod-shaped, plate-shaped, flake-shaped, and fibrous shapes. The average particle size of the filler is not particularly limited, but from the viewpoint of absorbing ambient light and dispersing the filler in the binder resin, it is preferable to have a particle size of 0.5 μm to 3 μm.

[0037] The slat body 12a and the triangular prism-shaped protrusion 126 may be formed integrally. Furthermore, as shown in Figure 6, the slat 12 may have a base portion 120 between the bottom surface 123 of the triangular prismatic projection 126 and the surface of the first region 121 of the slat body 12a. The resin constituting the base portion 120 is preferably the same resin as the resin constituting the triangular prismatic projection 126 in order to improve the adhesion between the base portion 120 and the triangular prismatic projection 126, and the adhesion between the base portion 120 and the slat body 12a. Also, when the triangular prismatic projection 126 and the base portion 120 are molded integrally, the adhesion between the bottom surface 123 and the surface of the first region 121 is improved compared to when the bottom surfaces 123 constituting the triangular prismatic projection 126 are each provided on the surface of the first region 121. This is because the base portion 120 and the surface of the first region 121 are in close contact.

[0038] Examples of resins constituting the base portion 120 include thermoplastic resins, thermosetting resins, and energy ray curable resins. Examples of thermoplastic resins include polypropylene resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic styrene resin, polyurethane resin, and urethane acrylate resin. Examples of thermosetting resins include epoxy resin and unsaturated polyester resin. Examples of energy ray curable resins include urethane acrylate resin, acrylic acrylate resin, and epoxy acrylate resin.

[0039] Furthermore, an adhesive layer (not shown) may be provided between the base portion 120 and the first region 121 of the slat body 12a. Examples of materials constituting the adhesive layer include urethane-based adhesives and acrylic-based adhesives.

[0040] Furthermore, the shape of the slat body is not limited to the above-described shape, as long as a triangular prism-shaped protrusion can be formed on the surface of the slat body, with a reflective layer formed on one side and an absorbent layer formed on the other side. Other slat bodies that can be used include, for example, a slat body having a long, slender, and flat plate-like shape in the extending direction, or a slat body having a plate-like shape with a curved cross-section in a direction intersecting the extending direction.

[0041] (Manufacturing method for a slat 12 having multiple triangular prism-shaped protrusions 126) An example of a manufacturing method for a slat 12 having multiple triangular prismatic protrusions 126 is described. First, a mold having an inverted shape of multiple arranged triangular prismatic protrusions 126 is prepared. The resin constituting the triangular prismatic protrusions 126 is applied to the surface of the mold where the inverted shape is formed to form a resin layer. The slat body 12a is laminated on the resin layer so that the surface of the first region 121 is in contact with it. Then, the laminate, which is laminated in the order of mold, resin layer, and slat body 12a, is pressed using a press machine. The laminate is cooled to room temperature while being pressed. After cooling, the mold is peeled off the laminate to obtain a slat 12 in which multiple triangular prismatic protrusions 126 are formed on the surface of the first region 121 of the slat body 12a. Here, the pressing conditions are, for example, a heating temperature of 150°C to 220°C, a pressure of 5 MPa to 10 MPa, and a heating time of 0.1 hours to 0.5 hours.

[0042] Next, a reflective layer 128 is formed on one surface 124 of the triangular prism-shaped protrusion 126. Specifically, a resin composition containing a binder resin and filler that constitutes the reflective layer 128 is applied to one surface 124 using a gravure coater, and then dried. After that, an absorbent layer 127 is formed on the other surface 125 of the triangular prism-shaped protrusion 126. Specifically, a resin composition containing a binder resin and filler that constitutes the absorbent layer 127 is applied to the other surface 125 using a gravure coater, and then dried. Through the above process, a slat 12 is obtained that has multiple triangular prism-shaped protrusions 126, each having a reflective layer 128 formed on one surface 124 and an absorbent layer 127 formed on the other surface 125.

[0043] In addition, in the manufacturing method described above, instead of the step of laminating the slat body 12a so that the surface of the first region 121 is in contact with the resin layer, a step of simultaneously forming the triangular prism-shaped protrusions 126 on both the first region 121 and the second region 122 of the slat body 12a may be used. If this step is included, a slat 12 is manufactured in which the triangular prism-shaped protrusions 126 are arranged on both the first region 121 and the second region 122 of the slat body 12a.

[0044] The blind 10 equipped with the slats 12 described above reflects the image light emitted from the projector with the reflective layer 128 without attenuation by polarizing plates or the like, thus enabling the display of a relatively bright image. Furthermore, since the image light is reflected by the reflective layer 128 with almost no attenuation, and sunlight is blocked by the second region 122 of the slat body 12a while ambient light is absorbed by the absorption layer 127, it is possible to project an image with relatively high contrast.

[0045] The following describes a projection system comprising a blind 10 and a projector, and the optical arrangement of the projection system.

[0046] (Projection system 40) As shown in Figures 7 and 8, the projection system 40 according to this embodiment includes a projector 30 that emits image light containing an image, and a blind 10 that projects the image light emitted from the projector 30 as an image. Distance OD is the distance from the main surface MS of the blind 10 to the observer 50.

[0047] Various known projectors can be used as the projector 30. Among the various known projectors, it is desirable that the projector 30 be a short-throw projector from the viewpoint of enabling the blind 10 to function properly. A short-throw projector is a projector in which the incident angle φ of the central light of the image light emitted from the projector 30 is large, and the distance L from the blind 10 to the projector 30 is short, as shown in Figure 8. The incident angle φ of the central light is the angle formed by the normal to the main surface MS of the blind 10 and the image light incident on the center of the main surface MS of the blind 10.

[0048] Depending on the type of projector, the incident angle φ and distance L of the projector 30 will differ. Also, the distance OD between the blind 10 and the observer 50 will differ depending on the manner of use. Therefore, the angles α and β that constitute the triangular prism-shaped protrusions 126 of the slat 12 can be changed to match the projector 30 used in the projection system 40 and the distance OD, so that the image projected onto the blind 10 can be seen by the observer.

[0049] Next, an example of the optical arrangement of the projection system 40 described above will be explained. (Optical arrangement of projection system 40) As an example, a projection system 40 will be described in which the distance OD from the blind 10 to the observer 50 is 2000 mm, the distance L from the blind 10 to the projector 30 is 470 mm, and the projector is a short-throw projector with an incident angle φ of 53°. In the blind 10 used in this projection system 40, the angle α of the triangular prism-shaped protrusion 126 arranged on the slat 12 shown in Figure 5 is 40°, the angle β is 82°, and the width of the base surface 123 is 300 μm. Furthermore, an absorption layer 127 is formed on the other surface 125 of the triangular prism-shaped protrusion 126, and a reflective layer 128 is formed on the other surface 124.

[0050] In the projection system 40 equipped with the aforementioned blind 10, as shown in Figure 8, the projector 30 emits image light PL toward the blind 10. The image light PL is reflected by the reflective layer 128 toward the front where the observer is located. The observer sees the image light PL. In addition, ambient light OL, such as light from indoor lights and stray light, is absorbed by the absorption layer 127. As a result, the image projected onto the blind 10 has excellent contrast. Furthermore, when no image light is projected onto the blind 10, the blind 10 can be raised to let in sunlight entering through the window. In addition, sunlight entering through the window can also be let in by tilting the slats 12 of the blind 10. The above is a description of the projection system 40.

[0051] The angle of incidence of the image light PL onto the main surface MS of the blind 10 differs at the top, center, and bottom of the blind 10. This difference in the angle of incidence can be used to change the angles α and β of the triangular prism-shaped protrusions 126 of the slats 12 provided at the top, center, and bottom of the blind 10. In this case, for example, the angle α of each triangular prism-shaped protrusion 126 can be adjusted so that the light emitted from the projector 30 and reflected by the reflective layers 128 of the multiple triangular prism-shaped protrusions 126 are approximately parallel to each other.

[0052] For example, as shown in Figure 8, when the projector 30 is positioned below the bottom rail 14, the angle of incidence of the image light PL onto the main surface MS of the blind 10 increases as it moves upward. For this reason, the angle α of one surface 124 of the upper triangular prism-shaped protrusion 126 may be set to be smaller. As a result, the contrast of the image projected onto the blind 10 is improved compared to a blind 10 having a triangular prism-shaped protrusion 126 whose angle α is set based solely on the incident angle φ of the central light.

[0053] In the embodiments described above, an example of a slat 12 having a plurality of triangular prism-shaped protrusions 126, each having a reflective layer 128 formed on one surface 124 and an absorbent layer 127 formed on the other surface 125, was shown, but the invention is not limited to this example. Modifications will be described below.

[0054] (A modified example of the slat 12, which has a triangular prism-shaped protrusion 126A on one of its surfaces 124 that has the function of reflecting light.) The triangular prism-shaped protrusion 126A is composed of a resin composition containing a binder resin and a filler having the function of reflecting light. Examples of the binder resin include thermoplastic resins, thermosetting resins, and energy ray curable resins. Examples of thermoplastic resins include polypropylene resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic styrene resin, polyurethane resin, and urethane acrylate resin. Examples of thermosetting resins include epoxy resin and unsaturated polyester resin. Examples of energy ray curable resins include urethane acrylate resin, acrylic acrylate resin, and epoxy acrylate resin. The filler is not particularly limited as long as it has the function of reflecting light, but examples include titanium dioxide, barium sulfate, hollow silica, hollow urethane, hollow acrylic, hollow styrene, barium chloride, and aluminum. The shape of the filler is not particularly limited, but examples include spherical, needle-shaped, rod-shaped, plate-shaped, flake-shaped, and fibrous. The average particle size of the filler is not particularly limited. From the standpoint of efficiently reflecting the image light emitted from the projector, the average particle size of the filler should preferably be between 0.3 μm and 0.8 μm. An absorption layer 127 is formed on the other surface 125.

[0055] With the above configuration, as shown in Figure 9, it is not necessary to provide a reflective layer 128 on one of the surfaces 124. This triangular prism-shaped protrusion 126A is one of which surfaces 124 itself is the reflective layer, and is included in the triangular prism-shaped protrusion having a reflective layer formed on one of the surfaces 124.

[0056] (A modified example of the slat 12, in which the other surface 125 itself has a triangular prism-shaped protrusion 126B that has the function of absorbing light) The triangular prism-shaped protrusions 126B are composed of a resin composition containing a binder resin and a filler having the function of absorbing light. Examples of the binder resin include thermoplastic resins, thermosetting resins, and energy-ray curable resins. Examples of thermoplastic resins include polypropylene resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic styrene resin, polyurethane resin, and urethane acrylate resin. Examples of thermosetting resins include epoxy resin and unsaturated polyester resin. Examples of energy-ray curable resins include urethane acrylate resin, acrylic acrylate resin, and epoxy acrylate resin. The filler is not particularly limited as long as it has the function of absorbing light, but examples include carbon black, perylene black, and black inorganic pigments. The shape of the filler is not particularly limited, but examples include spherical, needle-shaped, rod-shaped, plate-shaped, flake-shaped, and fibrous shapes. While there are no particular limitations on the average particle size of the filler, it is preferable that it be between 0.5 μm and 3 μm from the viewpoint of absorbing ambient light and dispersing the filler in the binder resin. A reflective layer 128 is formed on one of the surfaces 124.

[0057] With the above configuration, as shown in Figure 10, it is not necessary to provide an absorption layer 127 on the other surface 125. This triangular prismatic projection 126B is included in the triangular prismatic projection having an absorption layer formed on the other surface 125, where the other surface 125 itself is the absorption layer.

[0058] Furthermore, by adjusting the components of the triangular prism-shaped protrusions 126, at least the surface area of ​​one face 124 may be made light-reflective, and at least the surface area of ​​the other face 125 may be made light-absorbing, thereby creating a configuration that does not include either the absorption layer 127 or the reflection layer 128. Alternatively, by making at least the surface region of the other surface 125 light-absorbing, the absorbing layer 127 may be omitted, and the configuration may consist only of the reflective layer 128.

[0059] In the above description, a triangular prism-shaped protrusion 126 having a clearly defined triangular cross-section was used as an example. However, the cross-sectional shape of the protrusion is arbitrary as long as it can reflect the image light PL from the projector 30 toward the observer 50 and absorb ambient light OL. For example, it could be a triangular shape with chamfered corners or a trapezoidal shape in its physical cross-section. Functionally, these are also included in the triangular shape of the present invention. Furthermore, the external shape of the slat 12 is not limited to a long rectangular plate shape, but can be any shape as long as it can achieve the above-mentioned functions. For example, it may be an oval shape with the corners of a rectangle rounded off. Also, the slat 12 does not have to be plate-shaped.

[0060] Although the present invention has been described above using embodiments, various embodiments and modifications are possible without departing from the broad spirit and scope of the present invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the present invention. In other words, the scope of the present invention is indicated not by the embodiments, but by the claims. Various modifications made within the scope of the claims and the equivalent scope of the meaning of the invention are considered to be within the scope of this invention. [Explanation of symbols]

[0061] 1 Window frame, 2 Window glass, 10 Blinds, 11 Headbox, 12 Slats, 12a Slat body, 13 Ladder cord pair, 13a Ladder cord, 13b Ladder cord, 14 Bottom rail, 17 Operating cord, 19 Lifting cord, 30 Projector, 40 Projection system, 50 Observer, 120 Base section, 121 First area, 122 Second area, 123 Bottom surface, 124 One side, 125 The other side, 126 Triangular prism-shaped protrusion, 126A Triangular prism-shaped protrusion, 126B Triangular prism-shaped protrusion, 127 Absorbing layer, 128 Reflecting layer.

Claims

1. The slat body and A bottom surface fixed to at least one surface of the slat body, one surface inclined with respect to the normal direction of one surface of the slat body, and another surface inclined in a direction different from the direction in which the one surface inclined with respect to the normal direction of one surface of the slat body, and a plurality of triangular prism-shaped protrusions provided along the extending direction of the slat body and arranged in a line in a direction intersecting the extending direction, A reflective layer formed on one of the aforementioned surfaces, which reflects incident light, A slat comprising an absorbing layer formed on the other surface which absorbs incident light.

2. The slat body has a shape that is bent along a reference line parallel to the extending direction of the slat body, and one surface of the slat body has a first region and a second region on either side of the reference line. The slat according to claim 1, wherein a plurality of the triangular prism-shaped protrusions are provided in the first region.

3. A blind comprising the slats according to claim 1 or 2.

4. A projector that emits image light, A blind according to claim 3 that projects the image light emitted from the projector as an image, A projection system equipped with [features / equipment].

Images