Concentrating lens module and solar power generation panel

Abstract

To provide a condensing lens module capable of suppressing the area used by a solar battery element by increasing power generation efficiency in a simple structure.SOLUTION: A condensing lens module 1 includes: a plurality of condensing lenses 11(10) having inverted frustum shape; and a lens holding member 20 for guiding condensed solar light to solar battery elements 40, the condensing lens module being assembled to a housing body 30 which houses the solar battery elements. The lens holding member 20 includes: a plurality of lens holding units 22 for housing the condensing lenses 11, respectively; and an assembling unit 23 which assembles the condensing lenses 11 housed in the lens holding units 22 to the housing body 30 in positions separated from the solar battery elements. The lens holding unit 22 includes a lens reflection surface inclined along an outer peripheral surface of the condensing lens 11 and being in contact with the outer peripheral surface. The lens reflection surface is brought into contact with the outer peripheral surface, on the outer peripheral surface of the condensing lens 11, from an end part on an incident surface to an end part of an exit surface.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a condenser lens module and a solar power generation panel, and more particularly to a condenser lens module and a solar power generation panel including a plurality of condenser lenses and a lens holding member that holds the plurality of condenser lenses. [Background technology]

[0002] Conventionally, in order to increase power generation efficiency, a concentrating lens module has been known which includes a plurality of concentrating lenses that concentrate sunlight and a lens holding plate that holds each of the plurality of concentrating lenses and guides the sunlight concentrated by the concentrating lenses to a solar cell element, and which is assembled to a housing that houses a solar cell element (solar cell). By using this concentrating lens module, it is possible to realize a solar power generation panel that can increase power generation efficiency and reduce the area used for the solar cell elements (see, for example, Patent Document 1).

[0003] The solar power generation panel described in Patent Document 1 includes multiple dome-shaped concentrating lenses, a pyramidal homogenizer for directing sunlight concentrated by the concentrating lenses to a solar cell element, a solar cell element that photoelectrically converts the sunlight directed by the homogenizer, and a housing that contains the dome-shaped concentrating lenses, the solar cell element, and the homogenizer. Furthermore, the solar power generation device described in Patent Document 1 includes the above-mentioned solar power generation panel, and an automatic tracking device that tilts the power generation panel to track the sun and supports it so that it can rotate along the sun's orbit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-204471 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in a concentrating solar power generation panel such as that in Patent Document 1, in order to guide concentrated sunlight to the solar cell element, it was necessary to devise a way to suitably reflect (total reflect) the sunlight incident from the entrance surface of the concentrating lens in the direction of the exit surface, and to assemble the concentrating lens and the solar cell element so that they are suitably positioned. Also, in order to diffuse the heat generated by the focusing, it has been necessary to devise a suitable method for covering the focusing lens with a heat sink or the like.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a concentrating lens module and a solar power generation panel that have a simple structure yet are capable of increasing power generation efficiency and reducing the area used by the solar cell elements. Another object of the present invention is to provide a concentrating lens module and a solar power generation panel that are devised to improve the light reflection effect and heat dissipation effect compared to conventional methods when using a concentrating lens. [Means for solving the problem]

[0007] The above-mentioned problem is solved by the concentrating lens module of the present invention, which is a concentrating lens module comprising a plurality of concentrating lenses for concentrating sunlight, and a lens holding member for holding each of the plurality of concentrating lenses and for guiding the sunlight concentrated by the concentrating lenses to a solar cell element, and which is assembled to a housing for housing the solar cell element, wherein the concentrating lenses have a three-dimensional shape having an outer peripheral surface that slopes inward from a convex entrance surface toward an exit surface, and the lens holding member positions the plurality of concentrating lenses so as to be aligned, and comprises a plurality of lens holding parts for holding each of the positioned concentrating lenses so as to be housed therein. and an assembly portion that is provided at a position different from the plurality of lens holding portions and that assembles the concentrating lens housed in the lens holding portion to a mounting portion provided on the housing at a position spaced a predetermined distance from the solar cell element, wherein the lens holding portion is inclined along the outer peripheral surface of the concentrating lens so as to reflect sunlight incident from the incident surface of the concentrating lens toward the exit surface, and has a lens reflective surface abutting the outer peripheral surface of the concentrating lens, and the lens reflective surface abuts the outer peripheral surface of the concentrating lens from the end on the incident surface side to the end on the exit surface side on the outer peripheral surface of the concentrating lens.

[0008] With the above configuration, it is possible to realize a concentrating lens module that has a simple structure, yet is capable of increasing power generation efficiency and reducing the area used by the solar cell elements. In detail, the lens holding part has a lens reflecting surface that is inclined along the outer peripheral surface of the condenser lens and abuts against the outer peripheral surface of the condenser lens, and the lens reflecting surface abuts against the outer peripheral surface of the condenser lens from the end of the outer peripheral surface of the condenser lens on the incident surface side to the end of the outer peripheral surface of the condenser lens on the exit surface side. In other words, the lens reflecting surface abuts against the outer peripheral surface of the condenser lens from the upper end to the lower end in the height direction of the condenser lens. Therefore, the lens holding part (lens reflecting surface) can cover, for example, almost the entire outer peripheral surface of the condenser lens, and can appropriately reflect (total reflect) the concentrated sunlight and guide it toward the exit surface. In other words, the light reflection effect can be improved compared to the conventional art.

[0009] In this case, the focusing lens is a focusing lens having a dome-shaped or hemispherical entrance surface and an inverted frustum shape, the multiple focusing lenses are arranged in a horizontal line and adjacent focusing lenses are connected to form an integrated unit, and the lens holding member holds the integrated multiple focusing lenses so as to accommodate each focusing lens, and is assembled into the storage body so as to guide the sunlight focused by each focusing lens to the corresponding solar cell element. With the above configuration, it is possible to arrange relatively large concentrating lenses each having a dome-shaped (hemispherical) entrance surface and an inverted frustum shape in a simple arrangement and hold them in place with the lens holding member. Then, the sunlight concentrated by each concentrating lens can be guided to each solar cell element.

[0010] In this case, the lens holding member is formed from a metal heat sink that diffuses heat generated by focusing, and has a plate-shaped main body portion, a cylindrical lens holding portion formed so as to be recessed downward from the surface of the main body portion, and the assembly portion that protrudes downward from the outer edge of the main body portion and is arranged to surround the lens holding portion, and it is preferable that the assembly portion is arranged at a position opposite the lens holding portion and extends in the vertical direction from the end on the incident surface side to a position on the outer peripheral surface of the focusing lens that reaches the end on the exit surface side. As described above, the lens holder is formed of a heat sink, so that the heat dissipation effect can be improved compared to the conventional art. In addition, the lens holder is formed of a heat sink, and the heat dissipation effect can be further improved by having an assembly part formed of a heat sink and disposed so as to surround the condenser lens.

[0011] In this case, a light reflecting film made of a metal material is provided on the outer peripheral surface of the condenser lens or on the lens reflecting surface. AllThe condenser lens is fixed to the lens holding part by applying an adhesive having optical transparency and waterproofness between the outer peripheral surface of the condenser lens and the lens reflecting surface, and a coating film made of a near-infrared absorbing material or a near-infrared blocking material is applied to the incident surface of the condenser lens. All It is preferable that the insulating layer is formed over the entire surface. By forming the light reflecting film as described above, the light reflecting effect can be further improved. Furthermore, as described above, by applying an adhesive having transparency and waterproofness, it is possible to improve the waterproof effect at the contact surface between the condenser lens and the lens holding portion (lens reflecting surface). Furthermore, by forming the coating film as described above, it is possible to efficiently block the near-infrared energy contained in sunlight and suppress an increase in temperature.

[0012] The above problem can also be solved by a concentrating type solar power generation panel including the above-mentioned concentrating lens module, a solar cell element arranged at a position corresponding to each of the concentrating lenses and performing photoelectric conversion of concentrated sunlight, and a receiver substrate (electrode) connected to the solar cell element and supporting the solar cell element, and a storage body to which the concentrating lens module is assembled, wherein the storage body is box-shaped and has a bottom wall portion for arranging a plurality of the solar cell elements and a plurality of the receiver substrates in a line, and a side wall portion protruding upward from an outer edge of the bottom wall portion and arranged to surround the solar cell elements and the receiver substrate, and the solar power generation panel stores the concentrating lens module and holds the concentrating lens module in a floating state from the bottom wall portion by assembling the mounting portion and the mounting portion provided on the side wall portion. With the above-mentioned configuration, the housing is box-shaped, and the mounting portion and the mounting receiving portion provided on the side wall are assembled to store the condenser lens module and hold the condenser lens module in a state where it is floating above the bottom wall. This makes it possible to realize a solar power generation panel that has a simple structure but is capable of increasing power generation efficiency and reducing the area used by the solar cell elements.

[0013] In this case, the storage body is provided at a position on the bottom wall portion different from the position at which the solar cell element and the receiver substrate are arranged, and has a connecting member that is arranged between the bottom wall portion and the main body portion of the lens holding member and extends so as to abut against the bottom wall portion and the main body portion, and a second assembly portion provided on the main body portion and a second assembled portion provided on the bottom wall portion are connected via the connecting member. With the above-mentioned configuration, the condenser lens module can be easily assembled to the housing. Also, by assembling the housing and the condenser lens module from the left and right sides and from above and below, a firmly assembled solar power generation panel can be realized.

[0014] In this case, the second assembly part is preferably provided at a position on the main body part different from the lens holding part, and when the multiple focusing lenses integrated with the lens holding part are attached from above, the second assembly part is positioned in the space formed between adjacent focusing lenses and is exposed to the outside from between the multiple focusing lenses. With the above-mentioned configuration, a worker can assemble the housing and the condenser lens module from the outside in the vertical direction and from the outside in the left-right direction. For example, the solar panel can be easily assembled by fastening the assembly bolts from the outside.

[0015] In this case, when the assembly part and the assembled part are assembled, the gap portion formed between the assembly part and the assembled part and the surrounding area of ​​the gap portion are preferably filled with a waterproof resin material. With the above-described configuration, the waterproof effect can be improved at the contact surface between the assembly part and the assembled part. Effect of the Invention

[0016] The concentrating lens module and photovoltaic power generation panel of the present invention have a simple structure, but can increase power generation efficiency and reduce the area used for the solar cell element. Furthermore, when using a condenser lens, it is possible to improve the light reflection effect and heat dissipation effect more than before. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is an overall perspective view of a solar power generation system. [Diagram 2] FIG. 2 is a plan view of a solar power generation panel. [Diagram 3] FIG. 1 is a perspective view of a solar power generation panel. [Figure 4] FIG. 2 is an exploded perspective view of the solar power generation panel, showing the integrated concentrating lens, the lens holding member, and the housing. [Diagram 5] This is a VV cross-sectional view of a solar panel. [Figure 6] VI-VI cross-sectional view of a solar panel. [Figure 7] FIG. 2 is a diagram showing the positional relationship between a condenser lens and a solar cell element, and explaining the focal position. [Figure 8] 13A and 13B are diagrams showing a lens holding member according to a modified example. [Figure 9] FIG. 11 is a plan view of a solar power generation panel according to a second embodiment. [Figure 10] FIG. 13 is an exploded perspective view of a condenser lens, a lens holding member, and a solar cell element according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to an invention of a "condensing lens module" which comprises a plurality of condensing lenses and lens holding members which respectively hold the plurality of condensing lenses and guide condensed sunlight to solar cell elements, and which is assembled to a housing which houses the solar cell elements, and which has a main feature of being designed to enhance the light reflection effect and heat dissipation effect while having a simple structure. The invention also relates to a "solar power generation panel" equipped with the concentrating lens module, and a "solar power generation system" equipped with the solar power generation panel.

[0019] <Solar power generation system> As shown in FIG. 1, the solar power generation system S of this embodiment is mainly composed of a support pillar S1 that is installed on the ground and stands up from the ground, a tracking device S2 that is attached to the upper end of the support pillar S1 and supports the solar power generation panel P and causes the solar power generation panel P to track the sun, a control device S3 that controls the tracking device S2, and a concentrating solar power generation panel P that concentrates sunlight and performs photoelectric conversion of the concentrated sunlight. The solar power generation system S may be installed on the rooftop of a building, or on the roof of a building such as a house, other than on the ground.

[0020] The tracking device S2 rotates (swings) the solar power generation panel P relative to the support pole S1 and also rotates the solar power generation panel P so that the solar power generation panel P tracks the sun. The control device S3 is a controller that controls the driving of the tracking device S2, and controls the tracking device S2 so as to rotate and orbit the solar power generation panel P along the solar orbit.

[0021] With the above configuration, the solar power generation system S can control the solar power generation panel P (concentrating lens 11) to face directly toward the sun moving from east to west, thereby improving power generation efficiency and reducing the area used by the solar cell element 40. The solar power generation system S does not necessarily have to include the tracking device S2 and the control device S3.

[0022] <Solar power generation panels> As shown in Figures 2 to 6, the solar power generation panel P is a concentrating type solar power generation panel and includes a concentrating lens module 1 having an integrated concentrating lens 10 for concentrating sunlight and a lens holding member 20 for holding the integrated concentrating lens 10, and a housing 30 assembled to the concentrating lens module 1. The condenser lens module 1 is attached to a housing 30 (casing) which is the main body of the photovoltaic power generation panel P, and serves to increase the power generation efficiency. In addition, since the concentrating lens module 1 has a simple structure, it can be attached to the housing of an existing solar power generation panel that is not a concentrating type by appropriately changing the shape and arrangement of the integrated concentrating lens 10 and the lens holding member 20. In this way, it is possible to achieve the function of increasing the power generation efficiency of the existing solar power generation panel.

[0023] The integrated condenser lens 10 is configured such that a plurality of condenser lenses 11 are arranged side by side in the horizontal direction, and adjacent condenser lenses 11 are connected to each other to form an integrated unit. Specifically, the integrated condenser lens 10 has a quadrilateral shape (regular quadrilateral shape) and is arranged such that a total of 16 condenser lenses 11 are arranged, 4 vertically and 4 horizontally. The condenser lenses 11 adjacent to each other in the vertical and horizontal directions are connected so as to be in contact with each other. The condenser lenses 11 located diagonally (on a diagonal line) are not in contact with adjacent condenser lenses 11 on the diagonal, but are spaced apart from each other.

[0024] The integrated collecting lens 10 is produced as an integrated unit, for example, by pouring a resin material (optical resin material) into a mold and press-molding it. The integrated condenser lens 10 includes a plurality of condenser lenses 11 arranged at the same height, and a lens sheet 12 that connects the plurality of condenser lenses 11 and is formed in a flat shape.

[0025] The condenser lens 11 is a condenser Fresnel lens having a three-dimensional shape and an outer peripheral surface 11c that slopes inward from a convex incident surface 11a toward an exit surface 11b. Specifically, the condenser lens 11 has a dome-shaped entrance surface 11a and is an inverted truncated cone-shaped condenser lens. The condenser lens 11 may have a dome-shaped or hemispherical entrance surface, and may be an inverted truncated cone or an inverted truncated square pyramid. Also, the condenser lens 11 may be a normal lens instead of a Fresnel lens.

[0026] The lens sheet 12 has a certain thickness and is a sheet body integrally formed with the plurality of condenser lenses 11 . Specifically, the lens sheet 12 is positioned so as to extend outward from each focusing lens 11 in the horizontal direction, is formed to surround each focusing lens 11, and has a frame-shaped mounting portion 12a that is placed on the lens holding member 20 and the storage body 30. 2, the portions on the surface of the lens sheet 12 surrounded by the condenser lenses 11 form openings 12b. In other words, the portions on the surface of the lens sheet 12 surrounded by the condenser lenses 11 form opening holes. The openings 12b serve as opening holes for passing mounting bolts when assembling the condenser lens module 1 to the housing 30, and are formed at predetermined intervals.

[0027] As shown in Figures 3 to 6, the lens holding member 20 holds the integrated concentrating lenses 10 so that each concentrating lens 11 is housed therein, and is assembled to the housing body 30 so as to guide the sunlight concentrated by each concentrating lens 11 to the corresponding solar cell element 40. Specifically, the lens holding member 20 has a quadrilateral shape (regular quadrilateral shape), and a plurality of lens holding parts 22 are arranged so as to be aligned in the horizontal direction, similar to the condenser lenses 11. The lens holding parts 22 adjacent to each other in the vertical and horizontal directions are connected so as to be in contact with each other.

[0028] The lens holding member 20 is formed of a metal heat sink that diffuses heat generated by light collection, and is produced by press-molding a metal plate such as aluminum. The lens holding member 20 comprises a main body portion 21 formed in a plate shape (flat shape), multiple cylindrical lens holding portions 22 formed so as to be recessed downward from the surface of the main body portion 21 and house the focusing lenses 11, and an assembly portion 23 protruding downward from the outer edge of the main body portion 21 and surrounding the multiple lens holding portions 22, for assembly to the storage body 30 (assembly receiving portion 33). Further, on the surface of the main body 21, a portion surrounded by the lens holding portions 22 is formed with a second assembly portion 24 for assembly to the housing 30 (second assembly receiving portion 34).

[0029] The lens holders 22 position the condenser lenses 11 and hold the positioned condenser lenses 11 so as to accommodate them. The lens holding portion 22 is cylindrical and inclined along the outer peripheral surface 11c of the focusing lens so as to reflect sunlight incident from the incident surface 11a of the focusing lens toward the exit surface 11b, and has a lens reflecting surface 22a that abuts against the outer peripheral surface 11c. That is, the upper and bottom surfaces of the lens holding portion 22 form circular openings.

[0030] As shown in FIG. 5, lens reflecting surface 22a abuts on outer peripheral surface 11c of collecting lens 11 from the end on the incident surface 11a side to the end on the exit surface 11b side. This allows the lens reflecting surface 22a to cover almost the entire outer peripheral surface 11c of the condenser lens 11, and allows the condensed sunlight to be suitably reflected (total reflected) and guided toward the exit surface 11b. In other words, the light reflecting effect can be improved. Also, the heat dissipation effect can be improved. Here, "the end portion of the outer peripheral surface 11c on the side of the incident surface 11a" may mean the end portion of the outer peripheral surface 11c on the side of the incident surface 11a itself, or it may mean the vicinity (nearby) of the end portion on the side of the incident surface 11a, or the vicinity of the end portion. In other words, the lens reflecting surface 22a may abut the outer peripheral surface 11c from the end on the incident surface 11a side to the end on the exit surface 11b side, or it may abut from near the end on the incident surface 11a side to near the end on the exit surface 11b side (it does not have to reach the end).

[0031] In the above configuration, as shown in FIG. 5, a light reflecting film 25 made of a metal material is formed over substantially the entire surface of the outer circumferential surface 11c of the condenser lens 11 or the lens reflecting surface 22a. The light reflecting film 25 is made of, for example, an aluminum material, and is a reflecting film made of a material having a higher aluminum concentration than the lens holding member 20 . This can further enhance the light reflection effect.

[0032] In the above configuration, as shown in FIG. 5, the focusing lens 11 is fixed to the lens holding portion 22 by applying an adhesive 26 having optical transparency and waterproof properties between the outer peripheral surface 11c of the focusing lens 11 and the lens reflecting surface 22a. This can improve the waterproof effect at the contact surface between the condenser lens 11 and the lens reflecting surface 22a.

[0033] In the above configuration, as shown in FIG. 5, a coating film 27 made of a near-infrared absorbing material or a near-infrared blocking material is formed over substantially the entire incident surface 11a of the condenser lens 11. This makes it possible to efficiently block the near-infrared energy contained in sunlight and suppress temperature rise.

[0034] The assembly portion 23 assembles the condenser lens 11 housed in the lens holding portion 22 into the housing 30 (assembly receiving portion) at a position spaced a predetermined distance from the solar cell element 40, as shown in FIG. The assembly portion 23 is disposed at a position opposite to the lens holding portion 22, and like the lens holding portion 22, serves the heat dissipation function of diffusing heat generated by light collection.

[0035] The assembly portion 23 is arranged to surround the focusing lens 11 and, like the lens holding portion 22, extends in the vertical direction on the outer peripheral surface of the focusing lens 11 from the end on the incident surface 11a side to a position reaching the end on the exit surface 11b side. This can further improve the heat dissipation effect.

[0036] The assembly portion 23 is disposed at a position facing the side wall portion 32 of the housing 30, and has an assembly hole 23a to be assembled to an assembly receiving portion 33 provided in the housing 30 (side wall portion 32). The assembly holes 23a are formed at predetermined intervals along the longitudinal direction of the assembly portion 23 (a direction perpendicular to the up-down direction). The assembly hole 23a is provided at the same height as the condenser lens 11 (lens holding portion 22) and is disposed at a position facing the outermost condenser lens 11 (lens holding portion 22). Therefore, the condenser lens module 1 can be firmly assembled to the housing 30.

[0037] As shown in FIG. 6, the second assembly portion 24 is an assembly hole that penetrates in the vertical direction. The second assembly portion 24 is positioned in the space formed between adjacent focusing lenses 11 when the integrated focusing lens 10 is attached from above to the lens holding portion 22, and is exposed to the outside from between the multiple focusing lenses 11. More specifically, as shown in FIGS. 2 and 6, an opening 12b is formed between adjacent collecting lenses 11 in the integrated collecting lens . The second assembly portion 24 is disposed at a position overlapping the opening 12b in a plan view, and is a hole formed smaller than the opening 12b. Therefore, it can be confirmed that the second assembly portion 24 is exposed between the condenser lenses 11 through the opening 12b when viewed from above.

[0038] The second assembly portion 24 is disposed at a position facing the bottom wall portion 31 of the housing body 30, and is assembled via a connecting member 35 to a second assembly receiving portion 34 provided on the housing body 30 (bottom wall portion 31). This allows the condenser lens module 1 and the housing 30 to be assembled not only from the left and right sides but also from the top and bottom directions, thereby realizing a firmly assembled solar power generation panel P.

[0039] As shown in Figs. 3 and 4, the storage body 30 is a member that serves as a housing for the photovoltaic power generation panel P, and stores the solar cell element 40 and the receiver substrate 50, and also enables the condenser lens module 1 to be assembled thereto. In addition to the solar cell element 40 and the receiver substrate 50, the storage body 30 appropriately stores components required for photoelectric conversion of sunlight, storing the generated electricity, and supplying the stored electricity.

[0040] The storage body 30 is box-shaped and has a bottom wall portion 31 for arranging multiple solar cell elements 40 and multiple receiver substrates 50 in a line, and a side wall portion 32 that protrudes upward from the outer edge of the bottom wall portion 31 and is arranged to surround the solar cell elements 40 and the receiver substrate 50.

[0041] The solar cell element 40, also called a solar cell, is an energy conversion element that photoelectrically converts concentrated sunlight, and is made of a semiconductor such as silicon. The solar cell element 40 is sealed with a sealing layer made of, for example, a light-transmitting resin material. The solar cell elements 40 are arranged in a row in the vertical and horizontal directions, and are disposed at positions corresponding to the respective condenser lenses 11. The receiver substrate 50 is an electrode substrate that is connected to the solar cell element 40 and supports the solar cell element 40 . The receiver substrates 50 extend long in a predetermined direction (for example, the vertical direction), and a plurality of them are arranged at intervals in a direction (for example, the horizontal direction) perpendicular to the predetermined direction. The receiver substrate 50 may be a film-like substrate.

[0042] As shown in FIG. 5, the storage body 30 is assembled with the side wall portion 32 and the mounting portion 23 in contact with each other, thereby storing the condensing lens module 1 and holding the condensing lens module 1 in a floating state above the bottom wall portion 31. More specifically, the housing 30 and the condenser lens module 1 are assembled by assembling the assembly bolt 36 in a state where the assembly receiving portion 33 (assembly hole) formed in the side wall portion 32 communicates with the assembly hole 23a.

[0043] As shown in FIG. 6, the storage body 30 is provided at a position on the bottom wall portion 31 different from the position at which the solar cell element 40 and the receiver substrate 50 are arranged, and has a connecting member 35 that is arranged between the bottom wall portion 31 and the lens holding member 20 (main body portion 21) and extends so as to abut against the bottom wall portion 31 and the main body portion 21. The connecting member 35 is a hollow spacer member. In the above-described configuration, in the storage body 30, the second assembly portion 24 provided on the main body portion 21 and the second assembly receiving portion 34 provided on the bottom wall portion 31 are connected via a connecting member 35. In detail, the second assembly portion 24 (second assembly hole), the hollow connecting member 35, and the second assembled portion 34 (second assembled hole) are connected together, and the assembly bolt 36 is attached to the housing 30 and the condenser lens module 1.

[0044] The second assembly portion 24 is attached at a position corresponding to the opening 12b provided between the condenser lenses 11 in a plan view, and is exposed to the outside from between the condenser lenses 11. Therefore, a worker can perform the assembly work of the housing 30 and the condenser lens module 1 from the outside in the vertical direction and from the outside in the left-right direction.

[0045] In the above configuration, as shown in FIG. 5, when the assembly part 23 and the assembled part 33 are assembled, the gap formed between the assembly part 23 and the assembled part 33 and the surrounding area of ​​the gap are filled with a waterproof resin material 37. The resin material 37 is, for example, a resin material such as silicone. This can improve the waterproof effect at the contact surface between the assembly part 23 and the assembly receiving part 33.

[0046] <About the focal position> Next, the focal position of the concentrated sunlight will be described with reference to FIG. FIG. 7 is a diagram showing the positional relationship between the condenser lens 11 and the solar cell element 40. As shown in FIG.

[0047] When the condensing lens module 1 is assembled to the housing 30, the solar power generation panel P can hold the condensing lens module 1 in a state where it is suspended above the housing 30 (solar cell element 40). At this time, the solar cell element 40 is disposed so that the optical focal position F of the sunlight focused by the focusing lens 11 is different from the installation position of the solar cell element 40. More specifically, the solar cell element 40 is disposed closer to the condenser lens 11 than the optical focal position F. More specifically, the focusing lens 11 and the solar cell element 40 are arranged so that a corner of the solar cell element 40 (strictly speaking, a corner located on the focusing lens 11 side) is positioned on an extension line of the outer peripheral surface 11c of the focusing lens 11 in the side view shown in Figure 7. This makes it possible to achieve a design that improves light utilization efficiency while suppressing a temperature rise in the solar cell element 40 due to the heat of concentrated sunlight. Also, the life of the solar cell element 40 can be extended.

[0048] <Modifications of Lens Holding Member> As shown in FIG. 8, the lens holding member 20 may further include a leg portion 28 that is provided at the lower end of the lens holding portion 22 and protrudes downward from the lens holding portion 22. The legs 28 are interposed between the lens holding portion 22 and the housing body 30 (bottom wall portion 31 ), and abut against the bottom wall portion 31 to determine the height position of the lens holding member 20 . By doing so, the solar power generation panel P can hold the concentrating lens module 1 in a floating state at an appropriate height position above the housing 30 (solar cell element 40). In addition, when the lens holding member 20 has the leg portion 28, it is not necessary to have the second assembly portion 24. In other words, the housing body 30 does not need to have the second assembly receiving portion 34 and the connecting member 35.

[0049] <Solar power generation panel according to the second embodiment> Next, a solar power generation panel P2 according to a second embodiment will be described with reference to FIGS. It should be noted that the description overlapping with that of the solar power generation panel P described above will be omitted.

[0050] The solar power generation panel P2 includes a condenser lens module 101 having an integrated condenser lens 110 and a lens holding member 120, and a housing 130 attached to the condenser lens module 101.

[0051] The integrated condenser lens 110 has a plurality of condenser lenses 111 arranged at the same height, and a lens sheet 112 which connects the plurality of condenser lenses 111 and is formed in a flat shape. The condenser lens 111 has a dome-shaped entrance surface 111a, and is a condenser Fresnel lens having an inverted square pyramid shape (or an inverted regular square pyramid shape). The integrated condenser lens 110 is arranged such that a total of 16 condenser lenses 111 are arranged, four vertically and four horizontally. The condenser lenses 111 adjacent to each other in the vertical and horizontal directions are connected to be in contact with each other, and the condenser lenses 111 adjacent to each other on diagonals are also connected to be in contact with each other. In other words, the condenser lenses 111 are arranged closely together, with no gaps between adjacent condenser lenses 111. The lens holding member 120 includes a lens holding portion 122 formed to match the three-dimensional shape of the condenser lens 111 .

[0052] Even with the above configuration, it is possible to realize a concentrating solar power generation panel that has a simple structure yet is designed to have a higher light reflection effect and heat dissipation effect than conventional panels.

[0053] <Other embodiments> In the above embodiment, as shown in FIG. 4, the condenser lens 11 has a dome-shaped entrance surface 11a and is an inverted truncated cone-shaped lens, but the three-dimensional shape of the condenser lens 11 is not particularly limited. That is, the condenser lens 11 may have any three-dimensional shape having an outer peripheral surface that slopes inward from the convex incident surface 11a toward the exit surface 11b, and may be modified as appropriate.

[0054] In the above embodiment, the lens holding member 20 is formed of a metal heat sink, but this is not particularly limited. That is, the lens holding member 20 may be made of a material that has a heat dissipation effect.

[0055] In the above embodiment, as shown in FIG. 5, the lens holding part 22 is cylindrical and has openings at the top and bottom of the lens holding part 22, but the shape of the lens holding part 22 is not particularly limited. That is, the condenser lens 11 does not have to be cylindrical, and may have, for example, a light-transmitting bottom surface.

[0056] In the above embodiment, the concentrating lens module and the solar power generation panel according to the present invention have been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0057] S Solar power generation system S1 strut S2 tracking device S3 Control Unit P, P2 solar panels 1, 101 Condenser lens module 10, 110 Integrated condenser lens 11, 111 Condenser lens 11a, 111a entrance plane 11b Output surface 11c Outer surface 12, 112 Lens sheet 12a Placement part 12b Opening (opening hole) 20, 120 Lens holding member 21 Main body 22, 122 Lens holder 22a Lens reflective surface 23 Assembly section 23a Assembly hole 24 Second assembly part (second assembly hole) 25 Light reflective film 26 Adhesive 27 Coating film 30, 130 storage unit 31 Bottom wall 32 Side wall 33 Mounting part (mounting hole) 34 Second mounting part (second mounting hole) 35 Connecting members 36 Assembly bolt 37 Resin materials 40, 140 Solar cell element 50 Receiver Board F Light focal position

Claims

1. A plurality of concentrating lenses for concentrating sunlight; a lens holding member for holding each of the plurality of condenser lenses and for guiding the sunlight condensed by the condenser lenses to a solar cell element; A concentrating lens module that is assembled to a housing that houses the solar cell element, the condenser lens has a three-dimensional shape having an outer peripheral surface that is inclined inward from a convex incident surface toward an exit surface, The lens holding member is a plurality of lens holders that position the plurality of condenser lenses so as to be arranged side by side and hold the plurality of positioned condenser lenses so as to accommodate them, respectively; an assembly portion provided at a position different from the plurality of lens holding portions, for assembling the condenser lens housed in the lens holding portion to a mounting portion provided in the housing at a position spaced a predetermined distance from the solar cell element, the lens holding portion is inclined along an outer peripheral surface of the collecting lens so as to reflect sunlight incident from an incident surface of the collecting lens toward an exit surface, and has a lens reflecting surface in contact with the outer peripheral surface of the collecting lens; A focusing lens module, characterized in that the lens reflecting surface abuts against the outer peripheral surface of the focusing lens from a position on the outer peripheral surface of the focusing lens from the end on the incident surface side to the end on the exit surface side.

2. The condenser lens has a dome-shaped or hemispherical entrance surface and is an inverted frustum-shaped condenser lens, The plurality of condenser lenses are arranged so as to be aligned in a horizontal direction, and adjacent condenser lenses are connected to each other to be provided as an integral unit, The lens holding member is The integrated condenser lenses are held so as to be accommodated individually for each condenser lens; 2. The concentrating lens module according to claim 1, wherein the concentrating lens module is assembled in the housing so as to guide sunlight concentrated by each of the concentrating lenses to a corresponding solar cell element.

3. The lens holding member is It is formed by a metal heat sink that dissipates the heat generated by the light concentration. the lens holder has a plate-shaped main body, a cylindrical lens holder formed so as to be recessed downward from a surface of the main body, and the mounting portion protruding downward from an outer edge of the main body and disposed so as to surround the lens holder; The assembly portion includes: Located at a position facing the lens holding portion, 3. The focusing lens module according to claim 1, wherein the focusing lens extends in a vertical direction from an end of the focusing lens on the side of the entrance surface to an end of the focusing lens on the side of the exit surface.

4. a light reflecting film made of a metal material is formed on the entire outer peripheral surface of the condenser lens or the lens reflecting surface; the condensing lens is fixed to the lens holding portion by applying a light-transmitting and waterproof adhesive between an outer peripheral surface of the condensing lens and the lens reflecting surface, 4. The condenser lens module according to claim 1, wherein a coating film made of a near-infrared absorbing material or a near-infrared blocking material is formed on the entire incident surface of the condenser lens.

5. A condenser lens module according to any one of claims 1 to 4, a storage body in which the concentrating lens module is assembled, the storage body storing the solar cell elements, the solar cell elements being arranged at positions corresponding to the concentrating lenses and performing photoelectric conversion of concentrated sunlight, and a receiver substrate being connected to the solar cell elements and supporting the solar cell elements, The container is The solar cell element and the receiver substrate are arranged in a box shape, and the solar cell element and the receiver substrate are arranged in a box shape. The solar cell element and the receiver substrate are arranged in a box shape. The solar cell element and the receiver substrate are arranged in a box shape. The solar cell element and the receiver substrate are arranged in a box shape. The solar cell element and the receiver substrate are arranged in a box shape. A solar power generation panel characterized in that the concentrating lens module is stored and held in a floating state above the bottom wall portion by assembling the mounting portion and the mounting receiving portion provided on the side wall portion.

6. the housing has a connecting member provided at a position on the bottom wall portion different from a position at which the solar cell element and the receiver substrate are arranged, the connecting member being disposed between the bottom wall portion and a main body portion of the lens holding member and extending so as to abut against the bottom wall portion and the main body portion; The solar panel according to claim 5, characterized in that a second assembly portion provided on the main body portion and a second assembly receiving portion provided on the bottom wall portion are connected via the connecting member.

7. The second assembly portion is The lens holder is provided at a position different from the lens holder in the main body. When the plurality of condenser lenses integral with the lens holder are attached from above, the condenser lenses are positioned in spaces formed between adjacent condenser lenses, The solar panel according to claim 6, wherein the solar panel is exposed to the outside between the plurality of condenser lenses.

8. A solar panel as described in any one of claims 5 to 7, characterized in that when the assembly part and the assembled part are assembled, a gap portion and a peripheral portion of the gap portion formed between the assembly part and the assembled part are filled with a waterproof resin material.

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