WO2021111841A1 - Concentrator photovoltaic module, concentrator photovoltaic device, and method for manufacturing concentrator photovoltaic module - Google Patents

Abstract

This concentrator photovoltaic module is provided with a housing, a plurality of light receiving parts provided on the bottom surface of the housing, and a light condensing part (12) provided on top of the housing. The light condensing part (12) has at least one glass plate (70), and on the glass plate (70), a plurality of Fresnel lenses (71) disposed with the respective optical axes thereof aligning with the plurality of light receiving parts, and a reinforcing part (61) having a larger average thickness than the plurality of Fresnel lenses (71) are formed.

Description

Manufacturing method of concentrating solar power generation module, concentrating solar power generation device and concentrating solar power generation module

The present disclosure relates to a method for manufacturing a concentrating photovoltaic power generation module, a concentrating photovoltaic power generation device, and a concentrating photovoltaic power generation module.
This application claims priority based on Japanese Application No. 2019-217902 filed on December 2, 2019, and incorporates all the contents described in the Japanese application.

The concentrating photovoltaic power generation module is a device that condenses sunlight into a cell with a Fresnel lens to generate electricity (see, for example, Patent Document 1 (FIG. 1)). Many Fresnel lenses are arranged in a matrix to form a single sheet, which is attached to a glass plate to form a condensing portion. To give a numerical example of the dimensions, one area of the Fresnel lens is a square with a side of 50 mm, whereas the cell is a square with a side of 3.5 mm.

Patent Document 2 discloses a Fresnel lens structure in which a glass Fresnel lens and a cover glass are integrated. Patent Document 3 discloses a technique for obtaining a Fresnel lens by press-molding a glass material. Examples of the press molding include direct press molding in which molten glass is directly poured into a mold and pressure molding is performed, and reheat press molding in which a molded product once vitrified is reheated to be softened and deformed.

International Publication No. WO2015 / 102093 Japanese Unexamined Patent Publication No. 2012-212696 Japanese Unexamined Patent Publication No. 2014-108908

The concentrating solar power generation module of the present disclosure includes a housing, a plurality of light receiving units provided on the bottom surface of the housing, and a condensing unit provided on the upper part of the housing. The light unit has at least one glass plate, and the glass plate has a plurality of Fresnel lenses arranged so as to align the optical axis with each of the plurality of light receiving units, and is more average than the plurality of Fresnel lenses. It is a concentrating solar power generation module in which a thick reinforcing portion is formed.

In the method of manufacturing the condensing type solar power generation module of the present disclosure, a condensing portion having a glass plate on which a plurality of Fresnel lenses are arranged is aligned and placed on an upper portion of a housing having a plurality of light receiving portions on the bottom surface. A method of manufacturing a condensing type solar power generation module including a step, wherein a plurality of the Fresnel lenses, a reinforcing portion having an average thickness thicker than the plurality of Fresnel lenses, and the condensing portion are provided in the housing. The first step of preparing the condensing unit having at least one glass plate on which at least two alignment marks used for positioning are formed, and the alignment by imaging the glass plate. The second step of detecting the mark and memorizing the position, imaging the light receiving portion to be positionally associated with the alignment mark and memorizing the position, and the position of the alignment mark memorized by the second step. The housing and the collection so that the plurality of the light receiving portions and the plurality of Fresnel lenses are arranged with their optical axes aligned with each other based on the positions of the light receiving portions stored in the second step. Manufacture of a condensing solar power generation module comprising a third step of aligning the light portion, wherein the first step prepares the condensing portion having at least one of the alignment marks on the reinforcing portion. The method.

It is a perspective view which looked at the concentrating type solar power generation apparatus in a completed state which concerns on embodiment from the light receiving surface side. It is a perspective view which looked at the concentrating type solar power generation apparatus in the state of being assembled which concerns on embodiment from the light receiving surface side. It is a perspective view which shows the structure of the concentrating type photovoltaic power generation module which concerns on embodiment. It is sectional drawing which shows the structure of the light receiving part which concerns on embodiment. It is sectional drawing which shows the structure of the concentrating type photovoltaic power generation unit which concerns on embodiment. It is a top view which shows the structure of the back surface of the condensing part which concerns on embodiment. It is sectional drawing on the cutting line shown by the arrow A1 of FIG. It is a schematic diagram which shows the manufacturing apparatus which manufactures the condensing part which concerns on embodiment. It is a top view which shows the structure of the back surface of the condensing part which concerns on 1st modification. It is a top view which shows the structure of the back surface of the condensing part which concerns on 2nd modification. It is a top view which shows the part of the back surface of the condensing part which concerns on 2nd modification by enlarging. It is sectional drawing which shows the part on the cutting line shown by the arrow A2 of FIG. 11 enlarged. It is a top view which shows the structure of the back surface of the condensing part which concerns on 3rd modification. It is sectional drawing on the cutting line shown by the arrow A3 of FIG. It is sectional drawing which shows the part of FIG. 14 enlarged. It is sectional drawing which shows the variation of the 3rd modification. It is sectional drawing which shows the variation of the 3rd modification. It is sectional drawing which shows the variation of the 3rd modification. It is sectional drawing which shows the variation of the 3rd modification. It is a top view which shows the structure of the back surface of the condensing part which concerns on 4th modification. It is sectional drawing of the alignment mark part in the condensing part which concerns on 4th modification. It is explanatory drawing explaining the manufacturing method of the concentrating type photovoltaic power generation module which concerns on 4th modification. It is explanatory drawing explaining the manufacturing method of the concentrating type photovoltaic power generation module which concerns on 4th modification.

[Problems to be solved by the invention]
In the condensing type photovoltaic power generation module, the plurality of Fresnel lenses included in the condensing unit are arranged so as to align the optical axis with each of the plurality of light receiving units. The light collecting portion may be provided in a relatively thin flat plate shape (for example, a thickness of 3 mm) in order to reduce optical loss and manufacture at low cost. In this case, if many Fresnel lenses are arranged in the condensing portion, the area of the condensing portion becomes large, and the condensing portion may bend due to its own weight. Further, even when a strong wind blows on the condensing portion, the condensing portion may bend. When the condensing portion bends, the position of the Fresnel lens moves from the state where there is no bending, so that the condensing position of the Fresnel lens shifts from the light receiving portion, and the amount of power generation in the light receiving portion decreases. Therefore, in order to prevent a decrease in the amount of power generation due to bending, it is necessary to suppress bending of the condensing portion.

In view of such a problem, the present disclosure aims to suppress the bending of the condensing portion in the condensing type photovoltaic power generation module.

[Effect of the invention]
According to the present disclosure, in the concentrating solar power generation module, bending of the condensing portion can be suppressed.

[Explanation of Embodiments of the present disclosure]
The embodiments of the present disclosure include at least the following as a gist thereof.
(1) The condensing type solar power generation module of the present disclosure includes a housing, a plurality of light receiving portions provided on the bottom surface of the housing, and a condensing unit provided on the upper part of the housing. The condensing unit has at least one glass plate, and the glass plate includes a plurality of Fresnel lenses arranged with their respective optical axes aligned with each of the plurality of light receiving units, and a plurality of the Fresnel lenses. A reinforcing portion having a thicker average thickness than that of the reinforcing portion is formed.

The condensing unit of the condensing type photovoltaic power generation module of the present disclosure has at least one glass plate. A plurality of Fresnel lenses and a reinforcing portion are formed on the glass plate. Since the average thickness of the reinforcing portion is thicker than the average thickness of the plurality of Fresnel lenses, the reinforcing portion can suppress the bending of the condensing portion.

(2) In the concentrating photovoltaic power generation module of (1), preferably, the glass plate is located on the opposite side of the surface facing the sun and the back surface facing the light receiving portion. The reinforcing portion has a tip surface provided along the back surface, and the plurality of Fresnel lenses are located on the front surface side of the tip surface or at the same height position as the tip surface. Each of the convex end portions is provided, and the plurality of Fresnel lenses are provided so as to be recessed from the convex end portion toward the surface side.

In this case, the plurality of Fresnel lenses are provided so as to be recessed on the surface side of the tip surface of the reinforcing portion, and the convex end portion of the Fresnel lens does not protrude from the tip surface of the reinforcing portion. With such a configuration, when a plurality of condensing portions are stacked during transportation or manufacturing of the condensing portion, the front end surface of the reinforcing portion comes into contact with the surface of another condensing portion that overlaps adjacent to the back surface side. Therefore, it is possible to prevent the plurality of Fresnel lenses from coming into contact with the surface of other condensing portions. As a result, it is possible to stack a plurality of condensing portions while preventing scratches and chips from occurring on the Fresnel lens, so that it is possible to improve the transport efficiency and manufacturing efficiency of the condensing portions.

(3) In the concentrating photovoltaic power generation module according to (1) or (2), preferably, the Fresnel lens is connected to each other with a plurality of first convex portions which are convex regions formed concentrically. The reinforcing portion has a plurality of first groove portions which are grooves located between the adjacent first convex portions, and the reinforcing portion is a plurality of second convex portions which are convex regions formed concentrically. And a plurality of second groove portions, which are grooves located between the second convex portions adjacent to each other, and the depth of the second groove portion from the second convex portion is the first groove portion. It is shallower than the depth from the first convex portion of the above.

In this case, the reinforcing portion has a plurality of second groove portions having a depth shallower than that of the first groove portion of the Fresnel lens, and the reinforcing portion also collects light to the light receiving portion. While suppressing it, the light intensity that the condensing unit condenses on the light receiving unit can be further increased.

(4) In the concentrating photovoltaic power generation module of the above (3), preferably, the plurality of the first convex portions and the plurality of the second convex portions are concentric circles centered on the central portion of the Fresnel lens. The plurality of second convex portions are formed, and the plurality of second convex portions are provided outside the central portion with respect to the plurality of the first convex portions. In this case, a reinforcing portion is provided on the outside of the Fresnel lens. By connecting the reinforcing portions located on the outside of each Fresnel lens to form a frame shape, the bending rigidity of the condensing portion becomes stronger, and the bending of the condensing portion can be suppressed more reliably. ..

(5) In the concentrating photovoltaic power generation module according to any one of (1) to (4), preferably, at least a part of the reinforcing portions of the Fresnel lens adjacent to each other among the plurality of Fresnel lenses. It is provided between them. In this case, since the reinforcing portion provided between the Fresnel lenses reinforces the central portion of the condensing portion, the bending rigidity of the condensing portion becomes stronger, and the bending of the condensing portion can be suppressed more reliably. ..

(6) In any of the concentrating solar power generation modules (1) to (5), preferably, at least a part of the reinforcing portion is provided on the peripheral edge portion of the glass plate. In this case, by connecting the reinforcing portions to each other at the peripheral edge of the glass plate to form a frame shape, the bending rigidity of the condensing portion becomes stronger, and the bending of the condensing portion can be suppressed more reliably. ..

(7) In the concentrating photovoltaic power generation module according to any one of (1) to (6), preferably, the housing has a support portion that supports the glass plate upward, and the glass plate is The contact portion has a contact portion that comes into contact with the support portion, and the contact portion has a fitting portion that fits with the support portion. In this case, since the contact area between the support portion and the glass plate is increased by the fitting portion, the adhesive strength between the housing and the glass plate can be improved, and the reliability of the concentrating photovoltaic power generation module is further improved. be able to. In addition, the fitting portion facilitates the alignment between the housing and the glass plate, and it is possible to suppress a decrease in light collection performance and a decrease in yield due to a misalignment between the housing and the glass plate.

(8) In the concentrating photovoltaic power generation module according to any one of (1) to (7), preferably, the glass plate is at least used for positioning when the condensing portion is provided in the housing. It has two alignment marks, and at least one of the alignment marks is provided on the reinforcing portion. In this case, by forming the alignment mark on the reinforcing portion, it is possible to facilitate the alignment between the condensing portion and the light receiving portion when the condensing portion is provided on the upper part of the housing. Further, since at least one alignment mark is formed on the reinforcing portion, it is possible to suppress light scattering due to the alignment mark and optical loss due to shading.

(9) The concentrating photovoltaic power generation device of the present disclosure includes a concentrating solar power plant including an array formed by assembling a plurality of concentrating photovoltaic power generation modules according to any one of (1) to (8) above. It is a photovoltaic power generation device. In the condensing solar power generation device of the present disclosure, since a plurality of Fresnel lenses and reinforcing portions are formed in the condensing portion, it is possible to suppress bending of the condensing portion.

(10) In the method for manufacturing a condensing type solar power generation module of the present disclosure, a condensing portion having a glass plate on which a plurality of Fresnel lenses are arranged is aligned on an upper portion of a housing having a plurality of light receiving portions on the bottom surface. This is a method for manufacturing a condensing solar power generation module, which includes a step of placing the condensing lens on the lens. The first step of preparing the condensing unit having at least one glass plate on which at least two alignment marks used for positioning when provided on the body and the glass plate are imaged. The second step of detecting the alignment mark and memorizing the position, imaging the light receiving portion to be positionally associated with the alignment mark and memorizing the position, and the alignment memorized by the second step. Based on the position of the mark and the position of the light receiving unit stored in the second step, the housing so that the plurality of light receiving units and the plurality of Fresnel lenses are arranged so that their optical axes are aligned with each other. A third step of aligning the light collecting portion with the light collecting portion is provided, and the first step prepares the light collecting portion having at least one alignment mark on the reinforcing portion.

The concentrating photovoltaic module manufactured by the manufacturing method of the present disclosure has at least one glass plate. A plurality of Fresnel lenses and a reinforcing portion are formed on the glass plate. Since the average thickness of the reinforcing portion is thicker than the average thickness of the plurality of Fresnel lenses, the reinforcing portion can suppress the bending of the condensing portion. Further, in the manufacturing method of the present disclosure, since the alignment mark is formed on the reinforcing portion, it is possible to facilitate the alignment between the condensing portion and the light receiving portion when the condensing portion is provided on the upper part of the housing. .. Further, since at least one alignment mark is formed on the reinforcing portion, it is possible to suppress light scattering due to the alignment mark and optical loss due to shading.

[Details of Embodiments of the present disclosure]
Hereinafter, specific examples of the manufacturing method of the concentrating photovoltaic power generation module, the concentrating photovoltaic power generation device, and the concentrating photovoltaic power generation module of the present disclosure will be described with reference to the drawings.

<< Main configuration of photovoltaic power generation equipment >>
1 and 2 are perspective views of an example of a concentrating photovoltaic power generation device for one unit as viewed from the light receiving surface side. FIG. 1 shows a photovoltaic power generation device 100 in a completed state, and FIG. 2 shows a photovoltaic power generation device 100 in a state in the middle of assembly. FIG. 2 shows a state in which the skeleton of the tracking mount 25 can be seen in the right half, and a state in which a concentrating photovoltaic power generation module (hereinafter, also simply referred to as “module”) 1M is attached in the left half. When actually attaching the module 1M to the tracking pedestal 25, the tracking pedestal 25 is attached while lying on the ground.

In FIG. 1, the photovoltaic power generation device 100 includes an array (solar power generation panel) 1 which is continuous on the upper side and is divided into left and right on the lower side to form a planar light receiving surface as a whole, and a support mechanism 2 thereof. ing. The array 1 is configured by arranging the modules 1M on the tracking mount 25 (FIG. 2) on the back side. In the example of FIG. 1, the array 1 is an aggregate of 200 modules 1M in total, consisting of (96 (= 12 × 8) × 2) pieces constituting the left and right wings and 8 pieces in the central crossover portion. It is configured.

The support mechanism 2 includes a support column 21, a foundation 22, a drive unit 23, a horizontal axis 24 (FIG. 2) as a drive axis, and a tracking stand 25. The lower end of the support column 21 is fixed to the foundation 22, and the upper end is provided with a drive unit 23.

In FIG. 1, the foundation 22 is firmly buried in the ground so that only the upper surface can be seen. With the foundation 22 buried in the ground, the columns 21 are vertical and the horizontal axis 24 (FIG. 2) is horizontal. The drive unit 23 can rotate the horizontal axis 24 in two directions, an azimuth angle (an angle centered on the support column 21) and an elevation angle (an angle centered on the horizontal axis 24). In FIG. 2, a reinforcing member 25a for reinforcing the tracking pedestal 25 is attached to the horizontal shaft 24. Further, a plurality of horizontal rails 25b are attached to the reinforcing member 25a. Module 1M is mounted so as to fit into this rail. If the horizontal axis 24 rotates in the direction of the azimuth or elevation, the array 1 also rotates in that direction.

Array 1 is usually vertical as shown in FIG. 1 before dawn and sunset. During the daytime, the drive unit 23 operates so that the light receiving surface of the array 1 always faces the sun, and the array 1 performs the tracking operation of the sun.

<< Configuration example of concentrating solar power generation module >>
FIG. 3 is a perspective view showing the configuration of the module 1M according to the present embodiment. In FIG. 3, only the flexible printed wiring board 13 is shown on the bottom surface 11b side of the housing 11, and other components (light receiving unit 3, etc.) are omitted.

The module 1M includes, for example, a rectangular flat-bottomed container-shaped housing 11 made of metal or resin, a plurality of light receiving portions 3 (see FIG. 4) provided on the bottom surface 11b of the housing 11, and an upper portion of the housing 11. It includes a rectangular condensing unit 12 that can be attached like a lid.

The housing 11 has a bottom plate 111 which is a rectangular flat plate, and a frame 112 provided on the peripheral edge of the bottom plate 111. The surface of the bottom plate 111 that faces the light collecting portion 12 is the bottom surface 11b. A support portion that comes into contact with the light collecting portion 12 is provided on the upper portion of the frame body 112, and the frame body 112 supports the light collecting portion 12 upward by the support portion. On the bottom surface 11b, for example, in each of the left half and the right half of the housing 11, one elongated flexible printed wiring board 13 is arranged so as to be aligned while changing the direction as shown in the drawing. The flexible printed wiring board 13 has a relatively wide portion and a narrow portion. The cell 34 (see FIG. 4) included in the light receiving unit 3 is mounted on a wide portion.

The light collecting unit 12 is a single glass plate 70, and has a thickness of 3 mm in the present embodiment. The glass plate 70 mainly transmits light having a wavelength of 300 nm to 2000 nm among sunlight. The light collecting unit 12 has a front surface 12a facing the direction of the sun and a back surface 12b located on the opposite side of the surface 12a and facing the direction of the plurality of light receiving units 3. The light collecting unit 12 may have a configuration in which two or more glass plates are laminated at their respective peripheral edges. The light collecting unit 12 may include at least one glass plate.

A plurality of Fresnel lenses 71, which will be described later, are formed on the back surface 12b of the condensing unit 12. For example, each of the illustrated square regions (14 × 10 in the present embodiment, but the quantity is only an example) is a region having one Fresnel lens 71. Each of the plurality of regions can converge the sunlight to the focal position. It should be noted that the grid-like dotted lines are lines for convenience for expressing the area, and it is not necessary that such a partition line actually exists.

A shielding plate 14 is attached between the flexible printed wiring board 13 and the condensing unit 12. In this embodiment, the shielding plate 14 is made of metal. The shielding plate 14 is formed with a square opening 14a similar to the square of the Fresnel lens 71 at a position corresponding to the center of each Fresnel lens 71. If the array 1 accurately tracks the sun and the angle of incidence of the sunlight on the module 1M is 0 degrees, the light collected by the Fresnel lens 71 passes through the aperture 14a and is incident on the light receiving unit 3. When the tracking is significantly deviated, the collected light is shielded by the shielding plate 14. However, if the tracking deviation is slight, the focused light passes through the opening 14a.

<< Configuration example of the light receiving part >>
FIG. 4 is a cross-sectional view showing a configuration example of the light receiving portion 3 of the concentrating solar power generation module. It should be noted that each part shown in FIG. 4 is enlarged as appropriate for the convenience of structural explanation, and is not necessarily a diagram proportional to the actual dimensions (the same applies to the drawings after FIG. 5).

In FIG. 4, the light receiving portion 3 includes a ball lens 30, a protective plate 31, a support portion 32, a package 33, a cell 34, a lead frame 35 on the P side, a gold wire 36, a lead frame 37 on the N side, and a sealing portion 38. I have. The light receiving unit 3 is mounted on the flexible printed wiring board 13. A bypass diode is connected in parallel to the cell 34, but the illustration is omitted here.

The ball lens 30 is supported by the inner peripheral edge 31e of the upper end portion of the protective plate 31 mounted on the support portion 32 so that a gap in the optical axis Ax direction is formed between the ball lens 30 and the cell 34. The protective plate 31 is, for example, a metal washer. The support portion 32 is, for example, cylindrical and made of resin. The support portion 32 is fixed on the flat package 33. The package 33 is made of resin and holds the cell 34 and the lead frames 35 and 37. The cell 34 is a power generation element that converts light energy into electromotive force, and includes a semiconductor having a PN junction. The output of the cell 34 is drawn out to the lead frame 35 on the P side and to the lead frame 37 via the gold wire 36 on the N side. The sealing portion 38 is a light-transmitting silicone resin, and is provided so as to fill the space formed between the ball lens 30 and the cell 34 inside the protective plate 31 and the support portion 32.

<< Configuration example of concentrating solar power generation unit >>
FIG. 5 is a cross-sectional view showing an example of a concentrating photovoltaic power generation unit (hereinafter, appropriately referred to as a “unit”) 1U as a basic configuration of an optical system constituting the module 1M. FIG. 5 shows a state in which the unit 1U faces the sun as the array 1 tracks the sun, and the incident angle of the sunlight on the unit 1U is 0 degrees. In this state, the ball lens 30 and the cell 34 of the light receiving unit 3 are on the optical axis Ax of the Fresnel lens 71, and the light collected by the Fresnel lens 71 passes through the opening 14a of the shielding plate 14 and the ball of the light receiving unit 3. It is taken into the lens 30 and guided to the cell 34. That is, the plurality of Fresnel lenses 71 are arranged so that the optical axis Ax is aligned with each of the plurality of light receiving units 3.

<< Details of the condensing unit >>
The light collecting unit 12 according to the present embodiment will be described with reference to FIGS. 6 and 7 as appropriate. FIG. 6 is a plan view showing the back surface 12b of the condensing unit 12. FIG. 7 is a cross-sectional view taken along the cutting line of arrow A1 of FIG. In FIG. 7, only the condensing unit 12 is shown, and other configurations of the module 1M are omitted. The light collecting portion 12 is a glass plate 70, and a plurality of Fresnel lenses 71 and a reinforcing portion 61 are formed on the glass plate 70.

As shown in FIG. 6, a plurality of Fresnel lenses 71 are formed in a matrix on the back surface 12b of the condensing unit 12. Each of the plurality of Fresnel lenses 71 has a plurality of convex portions 711 which are convex regions formed concentrically. Further, each of the plurality of Fresnel lenses 71 has a positive refractive power. That is, each of the plurality of Fresnel lenses 71 is a positive lens. In FIG. 6, the number of matrix-like regions of the Fresnel lens 71 shows two 3 × 4 12 regions, but in reality, as shown in FIG. 3, the number is larger. The convex portion 711 of the Fresnel lens shown in FIG. 6 is also simplified for convenience of illustration, but is actually more numerous.

The reinforcing portion 61 includes a peripheral reinforcing portion 611 located at the peripheral edge of the condensing portion 12 (glass plate 70) and an intermediate reinforcing portion 612 located between the Fresnel lenses 71 adjacent to each other among the plurality of Fresnel lenses 71. Have.

Refer to FIG. The reinforcing portion 61 is a region having a thicker average thickness than the Fresnel lens 71. In FIG. 7, in order to express the boundary between the reinforcing portion 61 (peripheral reinforcing portion 611 and the intermediate reinforcing portion 612) and the Fresnel lens 71, a dotted line serving as a normal of the front surface 12a and the back surface 12b is provided in the condensing portion 12 for convenience. It is written as a partition line of. In reality, such a partition line does not have to exist.

Here, the average thickness will be described. Assuming that the volume of the region R1 for which the average thickness is to be calculated is V1 and the area of the region R1 is S1 in the glass plate 70, the average thickness T1 is calculated by the formula T1 = V1 / S1. In the present embodiment, since the volume V1 of one Fresnel lens 71 is 5000 cubic mm and the area S1 is 2500 square mm (a square having a side length of 50 mm), the average thickness T1 of the Fresnel lens 71 is 2 mm. Is. Further, since the plurality of Fresnel lenses 71 all have the same shape in the present embodiment, the overall average thickness T1 of the plurality of Fresnel lenses 71 is 2 mm.

In the present embodiment, the thickness of the reinforcing portion 61 is constant regardless of the location and is 3 mm. Therefore, the average thickness of the reinforcing portion 61 is also 3 mm. As described above, in the present embodiment, a plurality of Fresnel lenses 71 and a reinforcing portion 61 are formed on the condensing portion 12 (glass plate 70). Since the average thickness of the reinforcing portion 61 is thicker than the average thickness of the plurality of Fresnel lenses 71, the bending rigidity of the condensing portion 12 can be increased by the reinforcing portion 61, and the bending of the condensing portion 12 can be suppressed.

In the present embodiment, the average thickness of the reinforcing portion 61 is 3 mm, and the average thickness of the plurality of Fresnel lenses 71 is 2 mm. However, these numerical values are examples, and the average thickness of the reinforcing portion 61 is a plurality of Fresnel lenses. Other values may be used as long as they are thicker than the average thickness of 71.

In the present embodiment, since the peripheral edge reinforcing portion 611 is provided on the peripheral edge portion of the glass plate 70, the bending rigidity of the light collecting portion 12 becomes stronger because the peripheral edge reinforcing portion 611 forms a frame shape. Further, since the intermediate reinforcing portion 612 is provided between the Fresnel lenses 71 adjacent to each other, the intermediate reinforcing portion 612 reinforces the central portion of the condensing portion 12, so that the bending rigidity of the condensing portion 12 is stronger. Become. Therefore, the bending of the condensing unit 12 can be suppressed more reliably.

The peripheral reinforcing portion 611 and the intermediate reinforcing portion 612 preferably have a shape that is longer in the thickness direction than in the width direction. Specifically, the peripheral edge reinforcing portion 611 and the intermediate reinforcing portion 612 are provided in the longest direction in the depth direction of the paper surface in FIG. 7, and are provided in the longest length direction in the thickness direction next to the depth direction. In FIG. 7, the peripheral reinforcing portion 611 and the intermediate reinforcing portion 612 are provided longer in the thickness direction from the front surface 12a to the back surface 12b than in the width direction in which the plurality of Fresnel lenses 71 are arranged. .. With this configuration, the area of the reinforcing portion 61 can be kept small, and the bending rigidity of the condensing portion 12 can be further increased.

The reinforcing portion 61 has a tip surface 61a provided along the back surface 12b of the condensing portion 12. The front end surface 61a is a surface on the back surface 12b side of the peripheral reinforcing portion 611 and the intermediate reinforcing portion 612. The plurality of Fresnel lenses 71 have a convex end portion 712. The convex end portion 712 is the tip portion of the convex portion having the highest height from the surface 12a among the plurality of convex portions 711 of the Fresnel lens 71. In the present embodiment, the convex end portion 712 is located at the center of the Fresnel lens 71, but the other convex portion 711 may be the convex end portion 712.

The convex end portion 712 is located on the surface 12a side of the tip surface 61a. Since the convex end portion 712 is at the highest position among the plurality of convex portions 711, the Fresnel lens 71 is provided so as to be recessed from the convex end portion 712 toward the surface 12a. That is, the height of the Fresnel lens 71 is lower than that of the tip surface 61a. The convex end portion 712 may be provided at a height position that does not protrude from the tip surface 61a, and may be located at the same height position as the tip surface 61a. That is, the height of the Fresnel lens 71 may be the same as the tip surface 61a.

According to such a configuration, the plurality of Fresnel lenses 71 are provided recessed on the surface 12a side of the tip surface 61a of the reinforcing portion 61, and the convex end portion 712 of the Fresnel lens 71 is provided from the tip surface 61a of the reinforcing portion 61. Does not protrude. Therefore, when the plurality of condensing portions 12 are stacked during transportation or manufacturing of the condensing portion 12, the front end surface 61a of the reinforcing portion 61 overlaps with the surface 12a of the other condensing portion 12 adjacent to the back surface 12b side. Since they come into contact with each other, it is possible to prevent the plurality of Fresnel lenses 71 from coming into contact with the surface 12a of the other condensing unit 12. As a result, a plurality of condensing units 12 can be stacked while preventing the Fresnel lens 71 from being scratched or chipped, so that the transport efficiency and manufacturing efficiency of the condensing units can be improved.

<< Manufacturing method of condensing part >>
FIG. 8 is a schematic view showing an example of a manufacturing apparatus 80 for manufacturing the condensing unit 12 according to the present embodiment. The manufacturing apparatus 80 includes a supply unit 81, a transport unit 82, an impression cylinder 83, and a press unit 84. A method of manufacturing the condensing unit 12 will be described with reference to FIG.

The supply unit 81 has a heating unit and a molding unit, the glass is melted by the heating unit, the molten glass is molded by the molding unit, and the long glass sheet 121 in the left-right direction of FIG. 8 is transferred to the transport unit 82. Supply. The transport unit 82 has a plurality of long rollers in the width direction orthogonal to the paper surface of FIG. 8, and by rotationally driving some of the rollers, the glass sheet 121 is transported in the direction of the arrow AR1. Hereinafter, the direction in which the glass sheet 121 is conveyed is referred to as "transportation direction AR1".

The impression cylinder 83 is a rotary cylinder that is long in the width direction, and the length in the width direction is longer than the length in the width direction of the glass sheet 121. The impression cylinder 83 is provided on the transfer path of the glass sheet 121 so that the surface 121a of the glass sheet 121 conveyed by the transfer portion 82 and the peripheral surface of the impression cylinder 83 are in contact with each other. As shown in the enlarged view in FIG. 8, the peripheral surface 831 of the impression cylinder 83 has a flat shape. The impression cylinder 83 rotates in a direction in which the moving direction of the lower peripheral surface 831 coincides with the transport direction AR1 of the glass sheet 121 (counterclockwise in FIG. 8).

The press portion 84 is a rotary cylinder that is long in the width direction, and the length in the width direction is longer than the length in the width direction of the glass sheet 121. The press portion 84 is provided on the transport path of the glass sheet 121 so that the back surface 121b of the glass sheet 121 transported by the transport portion 82 and the peripheral surface of the press portion 84 are in contact with each other. Further, the press portion 84 is provided below the impression cylinder 83 so that the impression cylinder 83 is in contact with the back surface 121b on the opposite side of the position where the impression cylinder 83 is in contact with the front surface 121a of the glass sheet 121. As shown in the enlarged view in FIG. 8, a plurality of recesses 841 are formed on the peripheral surface of the press portion 84. The plurality of recesses 841 include a plurality of concentrically formed groove portions 842 and a rectangular groove portion 843. The recess 841 has a shape in which the Fresnel lens 71 and the reinforcing portion 61 are inverted. The groove portion 842 has an inverted shape of the convex portion 711, and the groove portion 843 has an inverted shape of the reinforcing portion 61. The press portion 84 rotates in a direction in which the movement direction of the upper peripheral surface coincides with the transport direction AR1 of the glass sheet 121 (clockwise in FIG. 8).

When the manufacturing operation of the condensing unit 12 is started in the manufacturing apparatus 80, the molten glass sheet 121 is sent out from the supply unit 81, and before the glass sheet 121 is completely cured, the impression cylinder 83 and the press are carried out by the transport unit 82. It is conveyed to a position in contact with the portion 84. Then, the impression cylinder 83 and the press portion 84 come into contact with the front surface 121a and the back surface 121b of the glass sheet 121 while rotating in a predetermined rotation direction. At this time, the glass sheet 121 is pressed on the back surface 121b side by the recess 841 of the press portion 84 while the front surface 121a side is supported by the flat peripheral surface 831 of the impression cylinder 83. As a result, the inverted shape of the recess 841 (that is, the shape of the Fresnel lens 71 and the reinforcing portion 61) is transferred to the back surface 121b of the glass sheet 121, and a plurality of convex portions 711 and the reinforcing portion 61 are formed on the back surface 121b. The glass sheet 121 after passing through the impression cylinder 83 and the press portion 84 is cut to an appropriate length to become one glass plate 70. As described above, the condensing unit 12 having one glass plate 70 is obtained.

The implementation of the present disclosure is not limited to this, and the impression cylinder 83 is arranged below the glass sheet 121, the press portion 84 is arranged above the glass sheet 121, and the peripheral surface of the press portion 84 is the surface 121a of the glass sheet 121. The shape of the Fresnel lens 71 may be formed on the surface 121a by contacting the surface 121a.

According to the above manufacturing apparatus 80, the Fresnel lens 71 and the reinforcing portion 61 can be integrally formed on one glass plate. As a result, it is possible to obtain a condensing unit 12 capable of suppressing bending.

<< Modification example >>
Although the embodiments of the present disclosure have been described above, the present disclosure can be modified in various ways other than the above-described embodiments. Hereinafter, a modified example according to the embodiment of the present disclosure will be described. In the following modification, the same components as those in the embodiment are designated by the same reference numerals and the description thereof will be omitted.

<< First modification >>
FIG. 9 is a plan view showing the configuration of the back surface 12b of the condensing unit 12c according to the first modification of the embodiment. This modification differs from the above-described embodiment in terms of the position of the reinforcing portion, and other points are common. The light collecting portion 12c is a single glass plate 70c, and the glass plate 70c is formed with a Fresnel lens 72 and a reinforcing portion 62. The Fresnel lens 72 has the same configuration as the Fresnel lens 71, and each has a plurality of convex portions 721. In the reinforcing portion 62, the intermediate reinforcing portion 622 and the intermediate reinforcing portion 623 are located between the peripheral reinforcing portion 621 located at the peripheral edge portion of the condensing portion 12c and the Fresnel lens 72 adjacent to each other. The intermediate reinforcing portion 623 is provided long in a direction intersecting the intermediate reinforcing portion 622. In this modification, the intermediate reinforcing portion 622 and the intermediate reinforcing portion 623 are arranged in a shape that crosses the inside of the peripheral edge reinforcing portion 621 while connecting one side of the peripheral edge reinforcing portion 621 and the other side facing the one side. Therefore, the bending of the condensing unit 12c can be suppressed more reliably.

<< Second variant >>
FIG. 10 is a plan view showing the configuration of the back surface 12b of the condensing unit 12d according to the second modification of the embodiment. This modification differs from the above-described embodiment in terms of the position of the reinforcing portion and the shape of the back surface side of the reinforcing portion, and other points are common. The light collecting portion 12d is a single glass plate 70d, and the glass plate 70d is formed with a Fresnel lens 73 and a reinforcing portion 63. In FIG. 10, the number of matrix-like regions of the Fresnel lens 73 is set to 12 of 3 × 4 for convenience of illustration, but in reality, as shown in FIG. 3, the number is larger.

FIG. 11 is an enlarged plan view showing a part of the back surface 12b of the condensing unit 12d. FIG. 12 is a cross-sectional view taken along the cutting line indicated by the arrow A2 in FIG. In FIG. 12, for convenience of explanation, the dimensions and the like of the concave-convex shape are appropriately changed from FIG. Further, in FIGS. 10, 11 and 12, in order to express the boundary between the reinforcing portion 63 and the Fresnel lens 73, a partition line for convenience is drawn in the condensing portion 12d with a dotted line. There is no need for such a divider.

Refer to FIG. The Fresnel lens 73 is formed on the back surface 12b side of the condensing portion 12d. In FIG. 10, the inside of the plurality of regions surrounded by the dotted line is a region that functions as a Fresnel lens 73, and the outside of the region is a region that functions as a reinforcing portion 63. The reinforcing portion 63 has a peripheral reinforcing portion 631 and an intermediate reinforcing portion 632. The peripheral edge reinforcing portion 631 is located on the peripheral edge portion of the light collecting portion 12d. The intermediate reinforcing portion 632 is located between the Fresnel lenses 73 adjacent to each other and between the Fresnel lens 73 and the peripheral reinforcing portion 631. Similar to the embodiment, in this modification as well, the average thickness of the peripheral reinforcing portion 631 and the intermediate reinforcing portion 632 is thicker than the average thickness of the plurality of Fresnel lenses 73.

Refer to FIG. The Fresnel lens 73 includes a plurality of first convex portions 731 which are concentrically formed convex regions and a plurality of first groove portions 732 which are grooves located between the first convex portions 731 adjacent to each other. Has. The intermediate reinforcing portion 632 is a plurality of second groove portions 634 which are grooves located between a plurality of second convex portions 633 which are concentrically formed convex regions and a second convex portion 633 which is adjacent to each other. And have.

Each of the plurality of Fresnel lenses 73 has a positive refractive power. That is, each of the plurality of Fresnel lenses 73 is a positive lens. Further, the intermediate reinforcing portion 632 has a positive refractive power due to the uneven shape formed by the second convex portion 633 and the second groove portion 634. The light incident on the intermediate reinforcing portion 632 from the surface 12a side is refracted toward the center side of the concentric circles of the plurality of second convex portions 633, so that the light is focused toward the light receiving portion 3.

As shown in FIG. 12, the depth d2 of the second groove portion 634 from the second convex portion 633 is shallower than the depth d1 of the first groove portion 732 from the first convex portion 731. In this way, by making the depth d2 shallower than the depth d1, the average thickness of the intermediate reinforcing portion 632 is made thicker than the average thickness of the Fresnel lens 73.

The average of the arrangement intervals (pitch) of the second convex portions 633 (and the second groove portions 634) adjacent to each other in the left-right direction on the paper surface is the average of the arrangement intervals (and the first groove portions 731) of the first convex portions 731 (and the first groove portions 731) adjacent to each other. Narrower than. That is, the plurality of second convex portions 633 are arranged more densely than the plurality of first convex portions 731. With this configuration, even if the depth d2 is shallower than the depth d1, the light can be more reliably collected by the intermediate reinforcing portion 632 toward the center side.

In this modification, the heights of the first convex portion 731 and the second convex portion 633 from the surface 12a side are the same. The heights of the first convex portion 731 and the second convex portion 633 from the surface 12a side may be different. For example, the second convex portion 633 may be higher than the first convex portion 731.

Refer to FIG. In FIG. 11, the central portion C of the Fresnel lens 73 is shown. The plurality of first convex portions 731 of the Fresnel lens 73 and the plurality of second convex portions 633 of the reinforcing portion 63 are formed concentrically around the central portion C of the Fresnel lens 73. The plurality of second convex portions 633 are provided outside the central portion C with respect to the plurality of first convex portions 731 having the same center. That is, the second convex portion 633 is located farther from the central portion C than the first convex portion 731.

As described above, in this modification, the intermediate reinforcing portion 632 is provided on the outside of the Fresnel lens 73. Then, the intermediate reinforcing portions 632 located on the outside of each Fresnel lens 73 are connected to each other to form a frame shape, so that the bending rigidity of the condensing portion 12d becomes stronger and the bending of the condensing portion 12d becomes stronger. It can be reliably suppressed.

In this modified example, the average thickness of the reinforcing portion 63 is thicker than the average thickness of the plurality of Fresnel lenses 73. Therefore, the reinforcing portion 63 can increase the bending rigidity of the condensing portion 12d and suppress the bending of the condensing portion 12d. Further, in this modification, since a part of the reinforcing portion 63 (intermediate reinforcing portion 632) also collects light on the light receiving portion 3, the reinforcing portion 63 suppresses the bending of the light collecting portion 12d and also collects the light collecting portion. The light intensity that 12d collects on the light receiving unit 3 can be further increased.

<< Third variant >>
FIG. 13 is a plan view showing the configuration of the back surface 12b of the condensing unit 12e according to the third modification of the embodiment. FIG. 14 is a cross-sectional view taken along the cutting line indicated by the arrow A3 in FIG. In FIG. 14, for the module 1Ma according to this modification, only the housing 11a, the condensing unit 12e, one light receiving unit 3 and the flexible printed wiring board 13 are shown for simplification, and other configurations are omitted. .. In this modification, a part of the shape of the housing and the light collecting portion is different from that of the above embodiment, and other points are common.

Refer to FIG. The housing 11a has a bottom plate 111 and a frame body 112. A support portion that comes into contact with the light collecting portion 12e is provided on the upper portion of the frame body 112, and the frame body 112 supports the light collecting portion 12e upward by the support portion. A protrusion 113 protruding upward is formed on the support portion. The protrusion 113 is formed in a triangular shape above the support. A caulking material (not shown) such as silicone may be thinly provided on the surface of the protrusion 113 along the shape of the protrusion 113.

The light collecting portion 12e has one glass plate 70e, and the glass plate 70e is formed with a Fresnel lens 71 and a reinforcing portion 61. The glass plate 70e has a contact portion that comes into contact with the support portion of the housing 11a. In this modification, the back surface 12b side of the peripheral edge reinforcing portion 611 of the reinforcing portion 61 is the contact portion. A fitting portion 91 recessed on the surface 12a side is formed in the contact portion. As shown in FIG. 13, the fitting portion 91 is formed over the entire circumference of the peripheral edge reinforcing portion 611 (that is, the contact portion). The fitting portion 91 may be formed intermittently in a part of the contact portion. For example, it may be formed only at the four corners of the peripheral edge reinforcing portion 611. Further, although the fitting portion 91 is provided in a single layer over the entire circumference of the peripheral edge reinforcing portion 611, the fitting portion 91 may be provided in a double layer.

FIG. 15A is an enlarged cross-sectional view showing a part including the fitting portion 91 of FIG. As shown in FIG. 15A, the cross-sectional shape of the fitting portion 91 is a shape obtained by reversing the cross-sectional shape of the protrusion 113. In the module 1Ma, the housing 11a supports the glass plate 70e by the support portion in a state where the fitting portion 91 is fitted to the protrusion 113. With this configuration, the contact area between the support portion and the glass plate 70e increases, so that the adhesive strength between the housing 11a and the glass plate 70e can be improved, and the reliability of the module 1Ma can be further increased. Can be done. Further, the fitting portion 91 facilitates the alignment between the housing 11a and the glass plate 70e, and it is possible to suppress a decrease in light collection performance and a decrease in yield due to a misalignment between the housing 11a and the glass plate 70e. Further, since the contact surface between the support portion and the glass plate 70e has an uneven shape, it is possible to suppress rainwater and dust from entering the housing 11a from the outside, and it is possible to improve the waterproof and dustproof performance of the module 1Ma.

In this modified example, various variations can be adopted as the shapes of the protrusions and the fitting portions. 15B and 15C are enlarged cross-sectional views showing a protrusion and a fitting portion according to a variation of the third modification. As shown in FIG. 15B, the protrusion 113a may be formed in a rectangular shape above the support. In this case, the cross-sectional shape of the fitting portion 91a is provided by reversing the cross-sectional shape of the protrusion 113a. As described above, various shapes may be adopted for the protrusion and the fitting portion.

As shown in FIG. 15C, the protrusion 113b may be formed in a trapezoidal shape above the support. The cross-sectional shape of the fitting portion 91b may be a shape that is larger than the shape obtained by reversing the cross-sectional shape of the protrusion 113b. The width of the paper surface of the fitting portion 91b in the left-right direction is slightly larger than the width of the protrusion 113b, and when the fitting portion 91b is fitted to the protrusion 113b, a slight gap (play) is generated in the width direction. Here, the gap is provided to be smaller than the tolerance allowed for the alignment accuracy between the glass plate 70e and the housing 11a. By providing the gap in this way, it is possible to facilitate the fitting between the protrusion 113b and the fitting portion 91b.

15D and 15E are cross-sectional views showing modules 1Mb and 1Mc according to variations. In FIGS. 15D and 15E, for the modules 1Mb and 1Mc related to the variation, only the housings 11c and 11d, the condensing unit 12f and 12g, one light receiving unit 3 and the flexible printed wiring board 13 are shown for simplification. The configuration of is omitted.

As shown in FIG. 15D, the light collecting portion 12f has one glass plate 70f, and the reinforcing portion is not formed on the glass plate 70f. A plurality of Fresnel lenses 74 having a plurality of concentrically formed convex portions 741 are formed on the back surface 12b of the concentrating portion 12f. A support portion for supporting the glass plate 70f is provided on the upper portion of the frame body 112 of the housing 11c, and a protrusion 113c is formed on the support portion. A fitting portion 91c having a cross-sectional shape obtained by reversing the cross-sectional shape of the protrusion 113c is provided on the peripheral edge portion of the light collecting portion 12f. With such a configuration, it is possible to further improve the reliability of the module 1Mb and suppress a decrease in light collection performance and a decrease in yield due to a positional deviation between the housing 11c and the glass plate 70f.

As shown in FIG. 15E, the condensing portion 12g has one glass plate 70g, and the reinforcing portion is not formed on the glass plate 70g. A plurality of Fresnel lenses 74 having a plurality of concentrically formed convex portions 741 are formed on the back surface 12b of the concentrating portion 12g. A support portion for supporting the glass plate 70 g is provided on the upper portion of the frame body 112 of the housing 11d, and a protrusion 113d is formed on the support portion. The protrusion 113d has a stepped shape. A fitting portion 91d having a cross-sectional shape obtained by reversing the cross-sectional shape of the protrusion 113d is provided on the peripheral edge portion of the light collecting portion 12g. With such a configuration, the reliability of the module 1 Mc can be further improved, and the decrease in light collection performance and the decrease in yield due to the misalignment between the housing 11d and the glass plate 70 g can be suppressed. In the variation of FIG. 15E, a reinforcing portion may be formed on the glass plate 70 g.

<< Fourth variant >>
FIG. 16 is a plan view showing the configuration of the back surface 12b of the condensing unit 12h according to the fourth modification of the embodiment. This modification is different from the above embodiment in that an alignment mark is formed on the condensing portion, and other points are common.

As shown in FIG. 16, the condensing portion 12h has one glass plate 70h, and the glass plate 70h is formed with a reinforcing portion 61 and a plurality of Fresnel lenses 71. The reinforcing portion 61 has a peripheral reinforcing portion 611 and an intermediate reinforcing portion 612. A plurality of alignment marks 92 are formed on the peripheral reinforcing portion 611 and the intermediate reinforcing portion 612, respectively. The alignment mark 92 is a mark used for positioning when the light collecting portion 12h is provided on the housing 11. The positioning method will be described later.

FIG. 17 is a cross-sectional view of the alignment mark 92 portion in the condensing portion 12h. As shown in FIG. 17, the alignment mark 92 has a cross-sectional shape protruding from the back surface 12b of the glass plate 70h toward the light receiving portion 3. The cross-sectional shape of the alignment mark 92 is not limited to the shape shown in FIG. 17, and may have a cross-sectional shape recessed from the back surface 12b to the front surface 12a of the glass plate 70h. The alignment mark 92 is formed when the Fresnel lens 71 is press-molded by the press portion 84. That is, in the fourth modification, a recess having an inverted shape of the alignment mark 92 is formed in the press portion 84, and is formed in the same process as the Fresnel lens 71 when the condensing portion 12h is manufactured.

In FIG. 16, the alignment mark 92 has a cross shape, but the shape of the alignment mark 92 is not limited to this, and may be a circular shape or a polygonal shape. Further, the alignment marks 92 may be arranged at two or more places on the glass plate 70h, and the number (6 pieces) shown in FIG. 16 is an example. Further, although all the alignment marks 92 are formed in the reinforcing portion 61 in FIG. 16, the position where the alignment marks 92 are arranged is not limited to this, and at least one alignment mark 92 is provided in the reinforcing portion 61. Just do it.

Next, an example of a mutual alignment method between the housing 11 and the condensing unit 12h as a part of the method for manufacturing the concentrating solar power generation module according to this modification will be described. FIG. 18 is an explanatory view showing an outline of the configuration of the control drive system together with a perspective view showing the housing 11 and the condensing unit 12h before alignment. In FIG. 18, the housing 11 and the condensing unit 12h are separately placed on the table 56. Here, the surface of the table 56 is defined as an XY plane. In the housing 11, only the four light receiving units 3 used for alignment are shown. Other members (a plurality of other light receiving portions 3, a flexible printed wiring board 13 and a shielding plate 14) are not shown in FIG. 18, but these other members are already housed in the housing 11. ..

The control drive system includes a camera 51, a drive unit 52 that drives the camera 51, a control unit 53 that controls the drive unit 52 and receives an image pickup signal from the camera 51, and an operation unit that gives an operation command to the control unit 53. A storage unit 55 that is accessible from the control unit 53 and stores information is provided. The control unit 53 includes, for example, a computer, and the computer executes software (computer program) to realize a necessary control function. The software is stored in the storage unit 55.

In the alignment method, the condensing unit 12h and the housing 11 are first prepared and placed on the table 56 (first step). After the first step, the alignment mark 92 and the light receiving unit 3 are imaged by the camera 51, and the second step of storing the respective positions in the storage unit 55 is performed.

When the second step is started, the control unit 53 controls the drive unit 52 to move the camera 51 and take an image of the condensing unit 12h according to the start command given from the operation unit 54 to the control unit 53. The camera 51 takes an image of the condensing unit 12h from a direction perpendicular to the XY plane. When the control unit 53 detects the alignment mark 92 in the image captured by the camera 51, the control unit 53 stores the X and Y coordinates (that is, the position of the alignment mark 92) in the storage unit 55. Here, the origin is set somewhere on the table 56, and the coordinates of the six alignment marks 92 are stored as _{(X Sn} , Y _{Sn), respectively.} Here, n is an integer from 1 to 6. After detecting two or more predetermined number of alignment marks 92 (six in this modification), the driving unit 52 stops the movement of the camera 51 and ends the imaging of the condensing unit 12h.

Next, the control unit 53 controls the drive unit 52 to move the camera 51 while taking an image of the housing 11. The camera 51 takes an image of the housing 11 from a direction perpendicular to the XY plane. The camera 51 images two or more light receiving units 3 located at predetermined locations in the housing 11. In this modification, the four light receiving units 3 shown in FIG. 18 are imaged. The light receiving unit 3 can be easily detected in the image due to the presence of the ball lens 30. When the light receiving unit 3 is detected, the control unit 53 stores the X and Y coordinates (that is, the position of the light receiving unit 3) at the center of the light receiving unit 3. Here, for example, the origin is set somewhere on the table 56, and the coordinates of the four light receiving units 3 are stored as _{(X Rm} , Y _{Rm), respectively.} Here, m is an integer from 1 to 4. After detecting two or more predetermined numbers (4 in this modification) of the light receiving units 3, the drive unit 52 stops the movement of the camera 51 and ends the imaging of the housing 11. With the above, the second step is completed.

After the second step, a third step of aligning the housing 11 and the condensing unit 12h is performed based on the position of the alignment mark 92 stored in the second step and the position of the light receiving unit 3.

FIG. 19 is an explanatory diagram showing a state in the middle of the third step. In FIG. 19, a perspective view showing the housing 11 and the condensing unit 12h being aligned is shown together with an outline of the configuration of the control drive system. FIG. 19 illustrates the manipulator 57 in addition to the configuration of FIG. The manipulator 57 is driven by a drive unit 52 that receives a command from the control unit 53. The manipulator 57 can move in the X and Y directions, move (elevate) in the direction perpendicular to the XY plane, rotate along the XY plane, and attract / release the light collecting unit 12h.

When the third step is started, the drive unit 52 drives the manipulator 57 according to the operation command of the control unit 53 to bring the manipulator 57 into contact with the surface 12a of the light collecting unit 12h. In this state, the manipulator 57 adsorbs the surface 12a of the condensing unit 12h and lifts the condensing unit 12h vertically. The drive unit 52 drives the manipulator 57 to move the light collecting unit 12h to the upper part of the housing 11, and moves the manipulator 57 based on the coordinate information of the alignment mark 92 and the light receiving unit 3 stored in the second step. By rotating the housing 11, the housing 11 and the condensing unit 12h are aligned so that the plurality of light receiving units 3 and the plurality of Fresnel lenses 71 are arranged so that the optical axes Ax (see FIG. 5) are aligned with each other. After that, the manipulator 57 is lowered, and the condensing unit 12h is placed on the support portion of the housing 11. With the above, the third step is completed.

Here, the alignment based on the coordinate information of the alignment mark 92 and the light receiving unit 3 stored in the second step will be described. In this modification, the center position of the Fresnel lens 71 corresponding to the light receiving unit 3 stored in the second step of the light collecting unit 12h is calculated based on the position of the alignment mark 92 stored in the second step. For example, among the alignment marks 92 located at the four corners of the condensing portion 12h in FIG. 18, the center coordinates of the Fresnel lens 71 located between them are obtained from the coordinate information of the alignment marks 92a and 92b. In the third step, the manipulator 57 is driven and the condensing unit 12h is placed on the support portion of the housing 11 so that the center coordinates and the coordinates of the light receiving portion 3a of the four light receiving portions 3 match. ..

In the method of manufacturing the concentrating solar power generation module according to the fourth modification, the alignment mark 92 is formed on the reinforcing portion 61, so that when the condensing portion 12h is provided on the upper part of the housing 11, the condensing portion 12h And the light receiving unit 3 can be easily aligned with each other. Further, since at least one alignment mark 92 is formed on the reinforcing portion 61, optical loss due to light scattering or shading due to the alignment mark 92 can be suppressed.

Further, the alignment mark 92 is formed by the pressing unit 84 in the same process as the Fresnel lens 71 during the manufacturing process of the condensing unit 12h shown in FIG. Therefore, the positional relationship between the Fresnel lens 71 and the alignment mark 92 is constant, the center position of the Fresnel lens 71 can be calculated more accurately from the alignment mark 92, and the alignment can be performed with higher accuracy. ..

<< Supplement >>
It should be noted that at least a part of the above-described embodiment and various modifications may be arbitrarily combined with each other. In addition, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present disclosure is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

1 array 100 photovoltaic device 1M, 1Ma, 1Mb, 1Mc module 1U unit 11, 11a, 11c, 11d housing 11b bottom surface 111 bottom plate 112 frame 113, 113a, 113b, 113c, 113d protrusions 12, 12c, 12d, 12e, 12f, 12g, 12h Condensing part 12a Front surface 12b Back side 13 Flexible printed wiring board 14 Shielding plate 14a Aperture 2 Support mechanism 21 Support 22 Foundation 23 Drive unit 24 Horizontal axis 25 Tracking mount 25a Reinforcing material 25b Rail 3, 3a Light receiving part 30 Ball lens 31 Protective plate 31e Upper end inner peripheral edge 32 Support 33 Package 34 Cell 35 Lead frame 36 Gold wire 37 Lead frame 38 Seal 56 Table 51 Camera 52 Drive 53 Control 54 Operation 55 Storage 57 Manipulator 61 , 62, 63 Reinforcing part 61a Tip surface 611, 621, 631 Peripheral reinforcing part 612, 622, 623, 632 Intermediate reinforcing part 633 Second convex part 634 Second groove part 70, 70c, 70d, 70e, 70f, 70g, 70h Glass Plate 71, 72, 73, 74 Fresnel lens 711, 721, 741 Convex part 712 Convex end part 731 1st convex part 732 1st groove part 80 Manufacturing equipment 81 Supply part 82 Conveyance part 83 Impressor 831 Peripheral surface 84 Press part 841 Concave part 842 Groove 843 Groove 121 Glass sheet 121a Front side 121b Back side 91, 91a, 91b, 91c, 91d Fitting part 92, 92a, 92b Alignment mark Ax Optical axis AR1 Transport direction C Center part d1 (First convex part of first groove part 732) Depth d2 (from 731) Depth (from second convex 633 of second groove 634)

Claims (10)

1. With the housing
   A plurality of light receiving parts provided on the bottom surface of the housing and
   A condensing unit provided on the upper part of the housing and
   With
   The condensing unit has at least one glass plate and has.
   The glass plate is formed with a plurality of Fresnel lenses arranged so as to align the optical axis with each of the plurality of light receiving portions, and a reinforcing portion having an average thickness thicker than that of the plurality of Fresnel lenses.
   Concentrated solar power generation module.
2. The glass plate has a front surface facing the sun and a back surface located on the opposite side of the surface and facing the light receiving portion.
   The reinforcing portion has a tip surface provided along the back surface.
   Each of the plurality of Fresnel lenses has a convex end portion located on the surface side of the tip surface or at the same height position as the tip surface.
   The plurality of Fresnel lenses are provided so as to be recessed from the convex end portion toward the surface side.
   The concentrating photovoltaic power generation module according to claim 1.
3. The Fresnel lens has a plurality of first convex portions, which are convex regions formed concentrically, and a plurality of first groove portions, which are grooves located between the first convex portions adjacent to each other. Have and
   The reinforcing portion includes a plurality of second convex portions, which are convex regions formed concentrically, and a plurality of second groove portions, which are grooves located between the second convex portions adjacent to each other. Have
   The depth of the second groove portion from the second convex portion is shallower than the depth of the first groove portion from the first convex portion.
   The concentrating photovoltaic power generation module according to claim 1 or 2.
4. The plurality of first convex portions and the plurality of second convex portions are formed concentrically around the central portion of the Fresnel lens.
   The plurality of the second convex portions are provided outside the central portion of the plurality of the first convex portions.
   The concentrating photovoltaic power generation module according to claim 3.
5. At least a part of the reinforcing portion is provided between the Fresnel lenses adjacent to each other among the plurality of Fresnel lenses.
   The concentrating photovoltaic power generation module according to any one of claims 1 to 4.
6. At least a part of the reinforcing portion is provided on the peripheral edge portion of the glass plate.
   The concentrating photovoltaic power generation module according to any one of claims 1 to 5.
7. The housing has a support portion that supports the glass plate upward.
   The glass plate has a contact portion that comes into contact with the support portion and has a contact portion.
   The contact portion has a fitting portion that fits with the support portion.
   The concentrating photovoltaic power generation module according to any one of claims 1 to 6.
8. The glass plate has at least two alignment marks used for positioning when the light collecting portion is provided in the housing.
   At least one of the alignment marks is provided on the reinforcing portion.
   The concentrating photovoltaic power generation module according to any one of claims 1 to 7.
9. The present invention comprises an array formed by assembling a plurality of concentrating photovoltaic power generation modules according to any one of claims 1 to 8.
   Concentrated solar power generation device.
10. A method for manufacturing a concentrating solar power generation module, which includes a step of aligning and placing a condensing portion having a glass plate on which a plurality of Fresnel lenses are arranged on an upper portion of a housing having a plurality of light receiving portions on the bottom surface. There,
    A plurality of the Fresnel lenses, a reinforcing portion having an average thickness thicker than the plurality of Fresnel lenses, and at least two alignment marks used for positioning when the condensing portion is provided in the housing are formed. The first step of preparing the condensing unit having at least one of the glass plates, and
    A second step of imaging the glass plate to detect the alignment mark and memorizing the position, and imaging the light receiving portion to be positionally associated with the alignment mark and memorizing the position.
    Based on the position of the alignment mark memorized by the second step and the position of the light receiving part memorized by the second step, the plurality of the light receiving parts and the plurality of Fresnel lenses align their optical axes with each other. A third step of aligning the housing and the condensing unit so that they are arranged,
    With
    In the first step, the condensing unit having at least one alignment mark on the reinforcing unit is prepared.
    A method for manufacturing a concentrating photovoltaic module.
    

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