Sheet shutter

Abstract

To provide a sheet shutter capable of reducing an amount of light leaking to the outdoors.SOLUTION: Provided is a shutter device 100 having a shielding sheet hanging down from a winding device installed above an opening in a building, and including a louver film 3 provided on the shielding sheet 2. The louver film 3 has transmission bands and shading bands arranged alternately in a vertical direction of the shutter device 100. The shading bands of the louver film 3 are inclined relative to a horizontal direction so that they are arranged downward as they move from the outdoor side of the building to the indoor side. The louver film 3 is provided on the outdoor side of the shielding sheet 2. The louver film 3 is provided in a window shape to a portion of the shielding sheet 2. The shutter device 100 includes a shading portion 4 provided on a portion of the shielding sheet 2 other than the portion where the louver film 3 is provided.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sheet shutter. [Background technology]

[0002] BACKGROUND ART Conventionally, sheet shutters for opening and closing openings in buildings have been known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-344414 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the shielding sheet of a sheet shutter is generally constructed to transmit light, for example, a relatively large amount of light from inside the room leaks outside at night, and this leaked light could cause a large number of insects outside to gather around the sheet shutter.

[0005] SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a sheet shutter that can reduce the amount of light leaking to the outdoors. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the objectives, the sheet shutter described in claim 1 is a sheet shutter having a shielding sheet hanging down from a winding device installed above an opening in a building, and is equipped with a louver film provided on the shielding sheet.

[0007] The sheet shutter described in claim 2 is the sheet shutter described in claim 1, wherein the louver film has transparent bands and shading bands arranged alternately in the vertical direction of the sheet shutter, and the shading bands of the louver film are inclined relative to the horizontal direction so that they are positioned downward as they move from the outdoor side of the building to the indoor side.

[0008] A sheet shutter according to a third aspect of the present invention is the sheet shutter according to the first aspect, wherein the louver film is provided on the outdoor side of the shielding sheet.

[0009] The sheet shutter described in claim 4 is the sheet shutter described in claim 1, wherein the louver film is provided in the shape of a window in a portion of the shielding sheet, and the sheet shutter comprises an impermeable material provided in a portion of the shielding sheet other than the portion where the louver film is provided.

[0010] A sheet shutter according to a fifth aspect of the present invention is the sheet shutter according to the fourth aspect, wherein the louver film is divided in the vertical direction of the sheet shutter.

[0011] A sixth aspect of the present invention provides a sheet shutter according to the fourth aspect, wherein the louver film is provided in a scale-like shape with parts overlapping each other in the vertical direction of the sheet shutter. [Effects of the Invention]

[0012] According to the sheet shutter of claim 1, by providing a louver film provided on the shielding sheet, for example, it is possible to reduce the amount of light leaking to the outdoors by the louver film.

[0013] According to the sheet shutter described in claim 2, the shading zone of the louver film is inclined relative to the horizontal so that it is positioned downward as it moves from the outdoor side of the building to the indoor side, thereby, for example, reducing the amount of light leakage to the outdoor side and maintaining safety by making the indoor side directly visible from the outdoor side.

[0014] According to the sheet shutter described in claim 3, the louver film is provided on the outdoor side of the shielding sheet, so that, for example, both the shadow of an object on the indoor side caused by light from the indoor side and the shadow of an object on the outdoor side caused by light from the outdoor side can be reflected on the shielding sheet, thereby making it possible to reliably maintain safety.

[0015] According to the sheet shutter described in claim 4, the louver film is provided in the shape of a window in a part of the shielding sheet, and by providing an opaque material in parts of the shielding sheet other than the part where the louver film is provided, it is possible to reliably reduce the amount of light leaking outdoors, for example.

[0016] According to the sheet shutter of claim 5, the louver film is divided in the vertical direction of the sheet shutter, which makes it easier to wind up the louver film and the shielding sheet, for example.

[0017] According to the sheet shutter of claim 6, the louver film is provided in a scale-like shape with parts overlapping each other in the vertical direction, which makes it easier to wind up the louver film and the shielding sheet, for example. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is an explanatory diagram of a louver film. [Figure 6] FIG. 10 is an explanatory diagram of a louver film. [Figure 7] 10A and 10B are explanatory diagrams illustrating reduction in light leakage and maintenance of safety. [Figure 8] 10A and 10B are explanatory diagrams illustrating reduction in light leakage and maintenance of safety. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. 2 is a side cross-sectional view of a part of the shutter device. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a sheet shutter according to the present invention will be described in detail with reference to the accompanying drawings.

[0020] [I] Basic Concept of the Embodiment First, the basic concept of the embodiment will be described. The embodiment relates to a sheet shutter.

[0021] A "sheet shutter" is a device for opening and closing an opening in a building, and is equipped with, for example, a louver film.

[0022] The term "louver film" refers to a component that has the function of blocking some of the light from passing through, and is a concept that includes, for example, film-like objects.

[0023] In the embodiment described below, an example will be given in which a "sheet shutter" is provided in an opening provided in a part that separates the inside and outside of a building, and is configured to open and close the opening.

[0024] [II] Specific details of the embodiment Next, specific details of the embodiment will be described.

[0025] (composition) First, the configuration of the shutter device according to this embodiment will be described. Fig. 1 is a front view of the shutter device, Fig. 2 is a side cross-sectional view of the shutter device, and Fig. 3 is a rear view of the shutter device. Fig. 2 shows a cross section taken along line AA in Fig. 1, and for ease of explanation, the illustration has been simplified by omitting hatching indicating cross sections, etc. (The same applies to Fig. 4 described below).

[0026] In each figure, the X, Y, and Z axes are perpendicular to one another. The Z axis indicates the vertical direction (up and down direction, height direction), with +Z indicating upward and -Z indicating downward. The Y axis indicates the horizontal direction, with +Y indicating the direction from the indoor side of the building toward the outdoor side with the shutter device 100 as the reference, and -Y indicating the direction from the outdoor side of the building toward the indoor side with the shutter device 100 as the reference.

[0027] 2, a light source L corresponding to the lighting device is provided inside a building, and the light source L is provided above (+Z) the shutter device 100. In this example, as shown in FIG.

[0028] The shutter device 100 in Figures 1 to 3 is a sheet shutter that opens and closes an opening provided in a part that separates the inside and outside of a building, and includes, for example, a winding device 1, a shielding sheet 2, a louver film 3, and a shading part 4.

[0029] (Configuration - winding device) The winding device 1 in Figures 1 to 3 is a device for winding up and unwinding the shielding sheet 2, louver film 3, and shading portion 4 (hereinafter also referred to as "shielding sheet 2, etc.") in Figure 2 to open and close an opening using the shielding sheet 2, etc. The winding device 1 is provided, for example, above (+Z) an opening in a building to be opened and closed.

[0030] This winding device 1 can be configured to include, for example, a winding shaft 11, a case that houses the winding shaft 11, a drive unit that rotates the winding shaft, etc., but since known configurations can be applied, only an outline will be described. The winding shaft 11 is provided along the X-axis direction and is a rotatable component. The winding shaft 11 is connected to the upper end (+Z) of the shielding sheet 2, etc., and by rotating clockwise or counterclockwise, it is possible to open the opening by winding up and storing the shielding sheet 2, etc., or to close the opening by unwinding the shielding sheet 2, etc.

[0031] In the following, a case where the shielding sheet 2 and the like are unwound and hanging down from the winding device 1 as shown in Figs. 1 to 3 will basically be described.

[0032] (Configuration - Shielding sheet) 2 and 3 is a sheet-like component that separates the indoor and outdoor areas of an opening in a building. The shielding sheet 2 has, for example, an upper end (+Z) connected to a winding shaft 11 and hangs down from a winding device 1. The shielding sheet 2 has, for example, a rectangular shape when viewed from the back (FIG. 3). The shielding sheet 2 may be made of any material including, for example, vinyl, polyester, etc.

[0033] In this embodiment, the shielding sheet 2 is described as being semi-transparent to the extent that it casts shadows, as described below, and allows the opposite side (from the outdoor side to the indoor side, or from the indoor side to the outdoor side) to be seen through. As a variation, the shielding sheet 2 may be set to any transparency, as long as the opposite side can be seen through. Note that "transparency" refers to the degree of transparency (i.e., the level of transparency).

[0034] (Configuration: Louver film) FIG. 4 is a side cross-sectional view of the shutter device, and FIGS. 5 and 6 are explanatory diagrams of the louver film.

[0035] 4 also shows an indoor worker 5 who is a worker working indoors, and an outdoor worker 6 who is a worker working outdoors. Also, FIG. 5 corresponds to an enlarged view of a portion of FIG. 4, and for the sake of convenience, some of the illustrations have been simplified.

[0036] 6 shows a view corresponding to a perspective view of the louver film 3, and although the transmission zones 33 and the light-shielding zones 34 are actually inclined as shown in FIG. 5, this inclination is omitted for simplification in FIG. 6. Also, in FIG. 6, some internal shapes are shown with dotted lines. In each figure, the configuration of each element of the louver film 3 (pitch, size, inclination, number, etc.) is shown for convenience of explanation.

[0037] The louver film 3 in Figures 1 and 2 is a component that has the function of blocking some light from passing through (i.e., a component that reduces the amount of light that passes through), and, for example, as shown in Figure 1, has a rectangular shape when viewed from the front, and is provided on the outdoor side (+Y) of the shielding sheet 2. The louver film 3 is fixed to the shielding sheet 2 by any fixing method, for example, a method using adhesive or the like, a method of fixing parts (such as the four corners) with fasteners, or a method of sewing.

[0038] The louver film 3 is, for example, smaller in size than the shielding sheet 2 (FIG. 3), that is, it is provided in a window-like shape in a part of the shielding sheet 2.

[0039] As shown in FIG. 6, the louver film 3 is a film-like structure as a whole, and includes, for example, a first outer layer 31, a second outer layer 32, a transmission zone 33, and a light-shielding zone .

[0040] (Configuration - Louver film - Outer layer) The first outer surface layer 31 and the second outer surface layer 32 are portions that form the outer surface of the louver film 3 in the thickness direction (Y axis) of the louver film 3, and are, for example, in the form of a rectangular sheet. A transmission band 33 and a light-shielding band 34 are provided between the first outer surface layer 31 and the second outer surface layer 32. The first outer surface layer 31 and the second outer surface layer 32 are, for example, extremely transparent so as to transmit various wavelengths, and can be made using any material (such as a resin material).

[0041] (Configuration - Louver film - Transmittance band) The transmission bands 33 are components that transmit light, and are provided, for example, between the light-shielding bands 34. The transmission bands 33 are, for example, extremely transparent so as to transmit visible light of various wavelengths, and can be made of any material (such as a resin material). As a variation, for example, the spaces (such as spaces containing air) provided between the light-shielding bands 34 may be used as the transmission bands 33.

[0042] A plurality of transmission bands 33 are provided along the vertical direction (Z axis), and the plurality of transmission bands 33 have the same shape as one another. Each transmission band 33 extends in the width direction (X axis).

[0043] (Configuration - Louver film - Shading strip) The light-shielding band 34 is a component that does not transmit light (i.e., blocks light). The material of this light-shielding band is arbitrary, and for example, it may be made by coloring the material used for the transmission band 33, or it may be made by using any other material (metal, etc.).

[0044] A plurality of light-shielding bands 34 are provided along the vertical direction (Z-axis), and the plurality of light-shielding bands 34 have the same shape. Each light-shielding band 34 has a strip shape extending in the width direction (X-axis), and is arranged so as to be parallel to each other.

[0045] The light-shielding bands 34 and the light-transmitting bands 33 are arranged alternately in the vertical direction (Z-axis) of the shutter device 100 (FIG. 2).

[0046] (Configuration - Louver film - Shading strip - Inclined) Although not shown in FIG. 6, the plurality of light-shielding bands 34 are actually inclined as shown in FIG.

[0047] This inclination is intended to reduce the amount of light leakage, for example, in order to prevent a large number of insects from gathering near the outdoor shutter device 100 due to light from indoor lighting (for example, light from light source L in FIG. 4) leaking to the outdoor side. Note that this inclination may also have other purposes, and in this embodiment, for example, the purpose is to maintain safety in addition to reducing the amount of light leakage. Note that the reduction of light leakage and the maintenance of safety will be described later.

[0048] The inclination direction and inclination angle 900 (the angle formed by the horizontal direction (Y-axis) and the shading band 34) of Figure 5 are arbitrary as long as the above-mentioned purpose can be achieved, but in this embodiment, for example, taking into consideration that the light source L in Figure 4 is located above (+Z) the shutter device 100, the light rays shown in Figure 5 (light rays from the light source L in Figure 4) are blocked, and taking into consideration the line of sight of the outdoor worker 6 in Figure 4, the inclination direction is set to be inclined relative to the horizontal direction (Y-axis) so that the shading band 34 is positioned downward as it moves from the outdoor side of the building toward the indoor side, and the inclination angle 900 is set to a predetermined angle.

[0049] The line of sight of the outdoor worker 6 may vary depending on the position and line of sight of the outdoor worker 6, but in consideration of maintaining safety, a representative line of sight may be determined in advance and used as the reference line of sight. In other words, the tilt direction and tilt angle 900 of the shading strip 34 may be determined so as not to block the entire representative line of sight.

[0050] Similarly, other configurations of the louver film 3 (such as the pitch and size of each component) are determined so as to achieve the above-mentioned purpose.

[0051] (Configuration - Light-shielding part) The shading portion 4 in Figures 1 and 2 is a component that does not allow light to pass through (i.e., blocks light), and is, for example, an opaque material that is provided in parts of the shielding sheet 2 other than the part where the louver film 3 is provided.

[0052] This shading portion 4 may be formed, for example, by vapor-depositing a metal material onto a portion of the outdoor (+Y) surface of the shielding sheet 2 (a portion other than the portion where the louver film 3 is provided), or by fixing a component having shading properties, such as a specified metal film, using any fixing method (such as a method using an adhesive, etc.).

[0053] (Reducing light leakage and maintaining safety) Next, a description will be given of the reduction in the amount of light leakage and the maintenance of safety in the shutter device 100 configured as described above. Figures 7 and 8 are explanatory diagrams of the reduction in the amount of light leakage and the maintenance of safety. Figures 7 and 8 correspond to Figure 5.

[0054] In the daytime, the outdoors is bright due to the sunlight, and at night, the sunlight is no longer shining and the outdoors is dark. On the other hand, indoors, the indoors is bright due to the light emitted from the light source L (FIG. 4) regardless of the time of day. The following explanation will be made separately for nighttime and daytime.

[0055] ===Night=== At night, the room becomes bright due to the light emitted from the light source L (FIG. 4). The light from the light source L is then emitted to the louver film 3 or the light-shielding portion 4 through the shielding sheet 2.

[0056] Light irradiated onto the shading portion 4 is blocked by the shading portion 4. On the other hand, light irradiated onto the louver film 3 is blocked by the shading band 34 that exists on the ray of the light, as shown in Fig. 5. Note that it is expected that some of the light will leak to the outdoors through the transmission band 33 of the louver film 3 after being reflected multiple times, but the amount of light leakage will be relatively small.

[0057] Therefore, the amount of light leaking outdoors can be reduced compared to when the shading portion 4 and louver film 3 are not provided, and it becomes possible to prevent large numbers of insects from gathering near the outdoor shutter device 100 due to leaked light.

[0058] In this case, as will be described below, the presence of the indoor object 51 can be recognized, so safety can be maintained.

[0059] The "indoor target" 51 is a concept that includes an object or a person that is present indoors near the shutter device 100, such as the indoor worker 5 in Fig. 4. In Fig. 7 and Fig. 8(a), the indoor target 51 is illustrated as a rectangle for the sake of convenience, but the actual shape is arbitrary.

[0060] Specifically, as shown in "line of sight" in Fig. 7, the outdoor worker 6 can confirm the presence of the indoor object 51 by directly visually confirming the presence of the indoor object 51, or by visually confirming the presence of a shadow 52 (shadow of the indoor object 51) cast on the shielding sheet 2 by the indoor object 51 located in the light beam of the indoor light source L. In other words, the outdoor worker can be made aware of the presence of the indoor object 51, thereby maintaining safety.

[0061] ===Daytime=== During the day, it is bright outside, so there is no need to assume that large numbers of insects will gather.

[0062] In this case, as will be described below, the presence of the indoor target 51 or the outdoor target 61 can be recognized, so safety can be maintained.

[0063] The "outdoor target" 61 is a concept that includes an object or a person that exists near the shutter device 100 outdoors, such as the outdoor worker 6 in Fig. 4. In Fig. 8(b), the outdoor target 61 is illustrated as a rectangle for the sake of convenience, but the actual shape is arbitrary.

[0064] <Presence of Indoor Object 51> Specifically, as shown in the "line of sight" in Fig. 8(a), the outdoor worker 6 can confirm the presence of the indoor object 51 by directly visually confirming the presence of the indoor object 51. In other words, the outdoor worker can be made aware of the presence of the indoor object 51, thereby maintaining safety.

[0065] <Existence of outdoor target 61> 8(b), an outdoor object 61 located in the light beam of the outdoor object can visually confirm the presence of a shadow 62 (the shadow of the outdoor object 61) cast on the shielding sheet 2 through the transmission band 33 of the louver film 3, thereby making it possible to confirm the presence of the outdoor object 61. In other words, the presence of the outdoor object 61 can be made known to the indoor side, thereby maintaining safety.

[0066] (Effects of this embodiment) According to this embodiment, by providing the louver film 3 on the shielding sheet 2, it is possible to reduce the amount of light leaking to the outdoors, for example.

[0067] [III] Modifications to the embodiment Although the embodiments of the present invention have been described above, the specific configurations and means of the present invention can be arbitrarily modified and improved within the scope of the technical ideas of each invention described in the claims.

[0068] (About Louver Film (Part 1)) 9 and 10 are front views of the shutter device, and Fig. 11 is a side cross-sectional view of part of the shutter device, Fig. 11 showing the cross section BB of Fig. 10.

[0069] === Variation 1 === For example, the louver film 3 in Fig. 1 may be replaced with the louver film 7 in Fig. 9. The louver film 7 is obtained by dividing the louver film 3 in Fig. 1 into three parts in the vertical direction (Z axis), and arranging the divided components at predetermined intervals from one another.

[0070] Specifically, the louver film 7 includes a first portion 71, a second portion 72, and a third portion 73. The configurations of the first portion 71, the second portion 72, and the third portion 73 are similar to the configuration of the louver film 3 described in the embodiment.

[0071] When configured in this manner, gaps are provided between the first part 71, the second part 72, and the third part 73 in the vertical direction, making it easier to wind up the shielding sheet, etc., using a winding device when opening an opening in a building.

[0072] Although the case where the image is divided into three parts has been described here, the number of divisions is arbitrary, and the image may be divided into two parts, or five or more parts (the same applies to "Modification 2" below).

[0073] === Variation 2 === Also, for example, the louver film 3 in Fig. 1 may be replaced with the louver film 8 in Fig. 10 and Fig. 11. The louver film 8 is obtained by dividing the louver film 3 in Fig. 1 into five parts in the vertical direction (Z axis), and arranging the divided components so that some of them overlap each other, forming a scale-like shape.

[0074] Specifically, the louver film 8 includes a first portion 81, a second portion 82, a third portion 83, a fourth portion 84, and a fifth portion 85 (hereinafter also referred to as "each portion"). The configurations of the first portion 81, the second portion 82, the third portion 83, the fourth portion 84, and the fifth portion 85 are similar to the configuration of the louver film 3 described in the embodiment.

[0075] These portions may be attached to the shielding sheet 2 by fixing the upper end (+Y) of each portion to the shielding sheet 2 by any fixing method (such as a method using adhesive or the like).

[0076] 11, an upper end 811 of the first portion 81, an upper end 821 of the second portion 82, an upper end 831 of the third portion 83, an upper end 841 of the fourth portion 84, and an upper end 851 of the fifth portion 85 may be fixed to the shielding sheet 2. Note that overlapping portions of each portion are not fixed to each other.

[0077] In this configuration, each part is fixed to the shielding sheet 2 only at its upper end, so that when opening the building opening, the shielding sheet etc. can be easily wound up by the winding device.

[0078] 11 may be interpreted as corresponding to a "scale-like" state. Furthermore, when the configuration of louver film 3 in FIG. 1 is changed to louver films 7 and 8, the specific configuration of the components of each louver film 7 and 8 (such as the tilt direction, tilt angle, pitch, and size of the light-shielding band) may be adjusted so as to achieve the objectives described in the embodiment (reducing light leakage and maintaining safety).

[0079] (About Louver Film (Part 2)) Furthermore, contrary to the case described in the embodiment, if it is expected that there are many insects on the indoor side, the indoor side is dark, and the outdoor side is bright, the shading strip 34 (Figure 6) of the louver film 3 may be configured to be inclined with respect to the horizontal direction (Y axis) so that it is positioned downward as it moves from the indoor side of the building to the outdoor side.

[0080] Also, for example, the louver film 3 and shading portion 4 in FIG. 2 may be provided on the indoor side of the shielding sheet 2 instead of the outdoor side, or may be provided on both the indoor and outdoor sides of the shielding sheet 2.

[0081] Furthermore, for example, in the shielding sheet 2 of Figure 2, an opening may be provided in the portion that overlaps (opposing portion) with the louver film 3 in the horizontal direction (Y-axis direction), and the louver film 3 may be provided in the portion corresponding to the opening.

[0082] Also, for example, the shape and size of the louver film 3 in front view may be the same as the shape and size of the shielding sheet 2, so that the louver film 3 is provided over the entire surface of the shielding sheet 2. In this case, the shading portion 4 in Fig. 1 is omitted.

[0083] (About the light-blocking zone of louver film) In the above embodiment, as shown in Figure 5, the case has been described in which, for example, with respect to two shading zones 34 adjacent to each other in the vertical direction (Z axis), the outdoor end (upper end, end on the +Y side) of the lower shading zone 34 is configured to be located higher (+Z) than the indoor end (lower end, end on the -Y side) of the upper shading zone 34, but this is not limited to this.

[0084] For example, by widening the pitch or changing the inclination angle 900, the outdoor end (top end, +Y end) of the lower shading strip 34 may be configured to be located lower (-Z) than the indoor end (bottom end, -Y end) of the upper shading strip 34. Alternatively, for example, by setting the inclination angle 900 to 0 degrees, the shading strip 34 may be configured to be parallel to the horizontal direction (Y axis).

[0085] (About the wavelength of light) Furthermore, in the above embodiment, the light has been described assuming wavelengths that correspond mainly to visible light, but the invention is not limited to this and may be configured to assume light of any wavelength so as to achieve the above-mentioned objectives (reducing the amount of light leakage to prevent large numbers of insects from gathering together, and maintaining safety).

[0086] (About combinations) Furthermore, features of the above-described embodiments and modifications may be arbitrarily extracted and combined. [Explanation of symbols]

[0087] 1 Winding device 2. Shielding sheet 3 Louver film 4 Light blocking section 5. Indoor workers 6. Outdoor workers 7 Louver Film 8 Louver Film 11 Winding shaft 31 First outer layer 32 Second outer layer 33 Transmission band 34 Shade strip 51 Indoor side 52 Shadow 61 Outdoor target 62 Shadow 71 Part 1 72 Part 2 73 Part 3 81 Part 1 82 Part 2 83 Part 3 84 Part 4 85 Part 5 100 shutter device 811 Upper end 821 Upper end 831 Upper end 841 Upper end 851 Upper end 900 tilt angle L light source

Claims

1. A sheet shutter having a shielding sheet hanging down from a winding device installed above an opening in a building, a louver film provided on the shielding sheet; A sheet shutter comprising:

2. The louver film is The sheet shutter has transmission zones and light-shielding zones that are alternately arranged in the up-down direction, The shading zone of the louver film is inclined with respect to the horizontal direction so as to be positioned downward from the outdoor side toward the indoor side of the building. The sheet shutter according to claim 1 .

3. The louver film is provided on the outdoor side of the shielding sheet. The sheet shutter according to claim 1 .

4. The louver film is provided in a window shape in a part of the shielding sheet, The sheet shutter is An opaque material is provided in a portion of the shielding sheet other than the portion where the louver film is provided, The sheet shutter according to claim 1 .

5. The louver film is divided in the vertical direction of the sheet shutter. The sheet shutter according to claim 4.

6. The louver film is provided in a scale-like shape, with portions of the louver film overlapping each other in the vertical direction of the sheet shutter. The sheet shutter according to claim 4.

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