Roller Screen Equipment

Abstract

To improve power generation efficiency in a roll screen device comprising a solar cell.SOLUTION: A roll screen device 10 comprises a screen part 12 configured in a sheet shape, and a holding part for holding the screen part 12. The screen part 12 includes: a solar cell 20; a light-receiving surface side sealing layer 24 formed on a light-receiving surface 20a of the solar cell 20; a light-receiving surface side coating layer 28 formed on the light-receiving surface side sealing layer 24; and a translucent hole 32 formed on the light-receiving surface side coating layer 28.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a roller blind device equipped with a solar cell. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a roll screen device in which solar cells are provided in a screen portion is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-179193 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned roller screen device, a sealing layer is formed on the light receiving surface of the solar cell, and a cover layer is further formed on top of that for surface protection. However, providing the cover layer may reduce the power generation efficiency.

[0005] The present disclosure has been made in view of such problems, and has an object to provide a technique for improving power generation efficiency in a roller blind device equipped with solar cells. [Means for solving the problem]

[0006] In order to solve the above problems, a roller blind device according to an embodiment of the present disclosure includes a sheet-like screen portion and a holder for holding the screen portion. The screen portion includes solar cells, a light-receiving-surface-side sealing layer formed on the light-receiving surface of the solar cells, a light-receiving-surface-side covering layer formed on the light-receiving-surface-side sealing layer, and a light-transmitting hole formed in the light-receiving-surface-side covering layer. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic front view of a roller blind device according to a first embodiment. [Diagram 2] 1 is a schematic horizontal cross-sectional view of a roller screen device according to a first embodiment. [Diagram 3] 3(a) to 3(d) are diagrams for explaining the types of light-transmitting holes. [Figure 4] FIG. 13 is a diagram for explaining a modified example of the roller blind device. [Diagram 5] FIG. 11 is a schematic front view of a roller blind device according to a modified example. [Figure 6] 13 is a diagram showing the periphery of a winding section of a roller screen device according to a modified example. FIG. [Figure 7] 13 is a diagram showing the periphery of a bottom rail of a roller blind device according to a modified example. FIG. [Figure 8] FIG. 11 is a schematic horizontal cross-sectional view of a roller screen device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components and members shown in each drawing are given the same reference numerals, and duplicated descriptions are omitted as appropriate. The dimensions of the members in each drawing are enlarged or reduced as appropriate for ease of understanding. Some of the members that are not important for explaining the embodiments are omitted in each drawing.

[0009] (First embodiment) 1 is a schematic front view of a roller blind device 10 according to a first embodiment. The roller blind device 10 is used by being attached to an opening of a building.

[0010] The roller blind device 10 includes a screen unit 12, a holder 14 for suspending and holding the screen unit 12, and a pair of guide rails 16, 17 for guiding the screen unit 12 as it moves up and down.

[0011] The screen unit 12 is configured as a flexible rectangular sheet body. The upper end of the screen unit 12 in the longitudinal direction is connected to a winding section 19 in the holding section 14, and a bottom rail 18 is provided at the lower end. The bottom rail 18 applies a force in a direction to pull the screen unit 12 downward, and also applies tension to the screen unit 12 to improve its flatness.

[0012] The screen unit 12 incorporates a plurality of solar cells 20. In the example shown in Fig. 1, a plurality of rectangular solar cells 20 are arranged in a vertical direction (height direction), but the arrangement method is not particularly limited and any arrangement is possible. The plurality of solar cells 20 are connected in series with each other. The solar cells 20 are configured to convert light energy into electric power by utilizing the photovoltaic effect. The layer structure of the screen unit 12 will be described later.

[0013] The holding unit 14 includes a winding unit 19 for winding up the screen unit 12, and a case 15 for housing the winding unit 19. The screen unit 12 can be raised and lowered by a known method such as a pull cord method or a chain method. Alternatively, an electric motor may be provided inside the case 15 to make it electrically operated.

[0014] The guide rails 16, 17 are disposed on both the left and right ends of the screen unit 12, and are configured to sandwich the ends of the screen unit 12. Providing the guide rails 16, 17 can prevent light leakage and heat leakage from the sides of the screen unit 12, thereby improving the light blocking performance, heat blocking performance, and heat insulation performance. In addition, the effect of suppressing wrinkles in the screen unit 12 can also be expected.

[0015] Furthermore, the screen portion 12 incorporating the solar cell 20 has a tendency to easily develop wrinkles and uneven surfaces compared to ordinary fabric screens. By providing the guide rails 16, 17, it is possible to reduce wrinkles and uneven surfaces in the screen portion 12. The gap between the guide rails and the roll screen may be filled with mohair or the like.

[0016] 2 is a schematic horizontal cross-sectional view of the roller blind device 10 according to the first embodiment. The screen unit 12 includes a solar cell 20, a light-receiving surface-side sealing layer 24 formed on the light-receiving surface (also called the power generation surface or front surface) 20a of the solar cell 20, a light-receiving surface-side sealing layer 24 formed on the light-receiving surface 20a of the solar cell 20, a back-side sealing layer 26 formed on the back surface (also called the non-light-receiving surface) 20b of the solar cell 20, a light-receiving surface-side covering layer 28 formed on the light-receiving surface-side sealing layer 24, and a back-side covering layer 30 formed on the back-side sealing layer 26. The roller blind device 10 is attached to an opening of a building so that the light-receiving surface of the solar cell 20 faces the outside of the room and the back surface of the solar cell 20 faces the inside of the room. The thickness of the screen unit 12 may be, for example, 0.5 mm to 2.0 mm.

[0017] The solar cell 20 includes, for example, a polyimide substrate 21, for example, a thin film silicon 22 formed on the polyimide substrate 21, and a transparent conductive film (ITO) 23 formed on the thin film silicon 22. The solar cell is not limited to thin film silicon, and may be an organic thin film, dye sensitization, perovskite, CIGS, CIS, or a tandem structure thereof.

[0018] The light-receiving surface-side sealing layer 24 is provided so as to cover the light-receiving surface 20a of the solar cell 20. Moreover, the back surface-side sealing layer 26 is provided so as to cover the back surface 20b of the solar cell 20. The sealing layer may be made of an olefin-based elastomer (TPO).

[0019] The back surface covering layer 30 is provided so as to cover the back surface sealing layer 26. The back surface covering layer 30 may be formed of fibers such as polypropylene, polyethylene, polyester, or plastics (synthetic resins). In order to provide the back surface covering layer 30 with light blocking properties, for example, a colored, opaque resin may be used. Alternatively, a separate light blocking layer may be provided on the back surface covering layer 30.

[0020] The light-receiving surface covering layer 28 is provided so as to cover the light-receiving surface sealing layer 24. The light-receiving surface covering layer 28 may be formed of a transparent or semi-transparent resin such as ETFE (Ethylene Tetra Fluoro Ethylene). Alternatively, the light-receiving surface covering layer 28 may be formed of a colored resin for the purpose of improving design, etc.

[0021] In the roller screen device 10 according to the first embodiment, a plurality of light-transmitting holes 32 are formed in the light-receiving surface side covering layer 28. The light-transmitting holes 32 may be arranged regularly or randomly. The diameter of the light-transmitting holes 32 may be 0.1 mm to 20 mm. The proportion of the light-transmitting holes 32 to the total area of ​​the light-receiving surface side covering layer 28 may be less than 1% to less than 100%, preferably 1% to 99%, and more preferably 5% to 80%.

[0022] 3(a) to 3(d) are diagrams for explaining the types of light-transmitting holes 32. The light-transmitting holes 32 formed in the light-receiving surface covering layer 28 may be circular or polygonal holes in a front view, as shown in FIG. 3(a). Alternatively, the light-transmitting hole 32 may be one large hole provided in the center of the light-receiving surface covering layer 28, as shown in FIG. 3(b). The one large hole does not need to be a hole that is completely surrounded, and may be a hole with a notched upper end as shown in FIG. (c), or may be a hole with notched upper and lower ends as shown in FIG. (d).

[0023] The light-transmitting hole 32 may be a through hole penetrating in the thickness direction of the light-receiving surface-side covering layer 28. Such a through hole may be formed in the material layer by a physical or chemical method after the material for forming the light-receiving surface-side covering layer 28 is applied all over the light-receiving surface-side sealing layer 24. Alternatively, the through hole may be formed by covering the portion of the light-receiving surface-side sealing layer 24 where the through hole is to be formed with tape or the like, applying the material for forming the light-receiving surface-side covering layer 28, and then peeling off the covering.

[0024] When the light-receiving surface of a solar cell is covered with a coating layer, power generation efficiency is reduced. Even when the coating layer is transparent or translucent, there is a slight reduction in power generation efficiency, and when the coating layer is colored, the degree of reduction in power generation efficiency is greater. In the roller blind device 10 according to the first embodiment, a plurality of light-transmitting holes 32 are formed in the light-receiving surface-side coating layer 28, so that sunlight can be taken into the solar cell 20 through the light-transmitting holes 32, thereby improving power generation efficiency. In particular, when the light-receiving surface-side coating layer 28 is colored, power generation efficiency can be significantly improved.

[0025] In the above example, the light-transmitting hole 32 is a through-hole, but the light-transmitting hole 32 is not limited to a through-hole and may be any hole having higher light-transmittance than the surrounding area. For example, the light-transmitting hole 32 may be a transparent hole-like portion provided in the non-transparent light-receiving surface side covering layer 28. In this case as well, sunlight can be taken in through the transparent hole-like portion to the solar cell 20, thereby improving the power generation efficiency compared to the case where the entire surface is non-transparent.

[0026] As described above, in the roller blind device 10 according to the first embodiment, the left and right ends of the screen unit 12 are sandwiched between the guide rails 16, 17. The solar cell 20 (more specifically, the thin film silicon 22 and the transparent electrode film 23) is not formed on the ends of the screen unit 12 sandwiched between the guide rails 16, 17.

[0027] The ends of the screen unit 12 slide on the guide rails 16, 17 as the screen unit 12 moves up and down, and so durability against sliding is required. Therefore, in this embodiment, no light-transmitting holes are formed in the ends 28a, 28b of the light-receiving surface side covering layer 28 that slide on the guide rails 16, 17. This makes it possible to prevent a decrease in strength due to the presence of light-transmitting holes and a decrease in transparency due to scratches, and therefore ensures sliding resistance.

[0028] In this way, according to the roller blind device 10 of this embodiment, it is possible to improve the power generation efficiency while ensuring the sliding resistance.

[0029] FIG. 4 is a diagram for explaining a modified example of the roller blind device. As shown in FIG. 4, in the roller blind device 110 according to the modified example, the dummy thin-film silicon 27 and the dummy transparent electrode film 29 are formed at the end of the screen part 12 sandwiched between the guide rails 16 and 17. The dummy thin-film silicon 27 and the dummy transparent electrode film 29 are not provided with an extraction electrode. That is, the part where the dummy thin-film silicon 27 and the dummy transparent electrode film 29 are formed is a dummy solar cell part 51 that does not contribute to power generation. On the other hand, the part where the thin-film silicon 22 and the transparent electrode film 23 are formed inside the dummy solar cell part 51 in the plane of the screen part 12 is provided with an extraction electrode, and is a solar cell part 50 that contributes to power generation. By forming such a dummy solar cell part 51, it is possible to unify the design with the solar cell part 50. Even if an electrode is provided in the part where the dummy thin-film silicon 27 and the dummy transparent electrode film 29 are formed, it is synonymous unless it is finally connected.

[0030] Fig. 5 is a schematic front view of a roller blind device 110 according to a modified example. Fig. 6 is a diagram showing the periphery of a winding section 19 of the roller blind device 110 according to a modified example. Fig. 7 is a diagram showing the periphery of a bottom rail 18 of the roller blind device 110 according to a modified example.

[0031] As described above, in the roller blind device 110, a dummy solar cell unit 51 is provided at the end of the screen unit 12 sandwiched between the guide rails 16, 17. In addition, in the roller blind device 110, a dummy solar cell unit 52 is also provided at a portion fixed to the winding unit 19 at the upper end of the screen unit 12, as shown in Fig. 6. In addition, in the roller blind device 110, a dummy solar cell unit 52 is also provided at a portion fixed to the bottom rail 18 at the lower end of the screen unit 12, as shown in Fig. 7.

[0032] The rolling screen device 10 according to this embodiment can also be used as a projection screen by projecting an image onto the back surface covering layer 30. That is, the rolling screen device 10 according to this embodiment can simultaneously achieve shading, power generation, projection, heat shielding, and insulation.

[0033] Second embodiment 8 is a schematic horizontal cross-sectional view of a roller screen device 40 according to the second embodiment. The roller screen device 40 according to the second embodiment differs from the roller screen device 10 according to the first embodiment in the configuration of the light-receiving surface side covering layer 28.

[0034] In the roller blind device 40 according to the second embodiment, a portion 28c of the light-receiving surface covering layer 28 that covers the solar cells 20 (more specifically, the thin-film silicon 22 and the transparent electrode film 23) is formed to be thinner than ends 28a, 28b of the light-receiving surface covering layer 28 that slide against the guide rails 16, 17. The thickness of the portion 28c of the light-receiving surface covering layer 28 that covers the solar cells 20 may be, for example, 0.025 mm to 0.25 mm. The thickness of the ends 28a, 28b of the light-receiving surface covering layer 28 that slide against the guide rails 16, 17 may be, for example, 0.5 mm to 1.5 mm.

[0035] In this way, by forming portion 28c of light-receiving surface side covering layer 28 that covers solar cell 20 thin, light can be easily taken in by solar cell 20, thereby improving power generation efficiency. In particular, when light-receiving surface side covering layer 28 is colored, power generation efficiency can be significantly improved.

[0036] On the other hand, ends 28a, 28b of light-receiving surface covering layer 28 that slide along guide rails 16, 17 are made thick, so that sliding resistance can be ensured.

[0037] In this way, the roller blind device 40 according to this embodiment can also improve power generation efficiency while ensuring resistance to sliding.

[0038] The present invention has been described above based on the embodiment. This embodiment is an example, and various modifications and changes are possible within the scope of the claims of the present invention, and it is understood by those skilled in the art that such modifications and changes are also within the scope of the claims of the present invention. Therefore, the description and drawings in this specification should be treated as illustrative rather than restrictive. [Explanation of symbols]

[0039] 10,40,110 Roller screen device, 12 Screen portion, 14 Holding portion, 15 Case, 16 Guide rail, 20 Solar cell, 21 Polyimide substrate, 22 Thin film silicon, 24 Light receiving surface sealing layer, 26 Back surface sealing layer, 28 Light receiving surface covering layer, 30 Back surface covering layer, 32 Light transmitting hole, 50 Solar cell portion, 51,52,53 Dummy solar cell portion.

Claims

1. A roller blind device including a sheet-shaped screen portion and a holder for holding the screen portion, The screen portion is A solar cell; a light-receiving surface-side sealing layer formed on the light-receiving surface of the solar cell; a light-receiving-surface-side covering layer formed on the light-receiving-surface-side sealing layer; a light transmitting hole formed in the light receiving surface side covering layer; A roller blind device comprising:

2. The roller blind device according to claim 1, further comprising a guide rail for guiding the raising and lowering of the screen unit.

3. 3. The roller blind device according to claim 2, wherein the light transmitting hole is not formed at an end of the light receiving surface side covering layer that slides along the guide rail.

4. 4. The roller blind device according to claim 2, wherein a dummy solar cell portion that does not contribute to power generation is formed at an end of the screen portion that is sandwiched between the guide rails.

5. A winding unit for winding up the screen unit is further provided, 5. The roller blind device according to claim 1, wherein a dummy solar cell portion that does not contribute to power generation is formed at a portion of the upper end of the screen portion that is fixed to the roll-up portion.

6. A bottom rail is further provided at the bottom of the screen portion, 6. The roller blind device according to claim 1, wherein a dummy solar cell portion that does not contribute to power generation is formed at a portion of the lower end of the screen portion that is fixed to the bottom rail.

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