JP5258805B2 - Photovoltaic power generation apparatus and method for manufacturing solar power generation apparatus - Google Patents

Description

  The present invention relates to a solar power generation device and a method for manufacturing the solar power generation device.

  A solar power generation device is an effective device for preventing global warming because it does not generate carbon dioxide when generating power. Solar power generation devices are required to have high power generation efficiency, low resource consumption for manufacturing, easy production, and low cost.

  Patent Document 1 discloses a solar cell module in which a cell as a power generation portion is disposed between a cover film and a front cover, and the cover film, the cell, and the front cover are supported by a frame so as to be sandwiched laterally from the end portion. The structure of is described.

  One of the power generation elements used in the solar power generation apparatus is a PN junction type photoelectric conversion element, and silicon or a compound semiconductor is used as the material thereof. When crystalline (single crystal) silicon is used as the material of the photoelectric conversion element, the power generation efficiency is high, but the number of suppliers is limited, and the price of the material is not low. On the other hand, it is configured to condense sunlight, and a photoelectric conversion element is provided at the focal position of the condensing unit, whereby the amount of material used for the photoelectric conversion element can be reduced.

  Patent Document 2 describes a concentrating solar power generation apparatus in which sunlight collected by a Fresnel lens is emitted to a solar battery cell via an optical fiber. Thus, according to Patent Document 2, since the chromatic aberration generated by the Fresnel lens is corrected in the optical fiber, it is possible to suppress a decrease in conversion efficiency in the solar battery cell due to the chromatic aberration.

  Patent Document 3 describes a compound plano-convex columnar Fresnel lens for use as a solar water heater or a solar cell concentrator. This complex plano-convex columnar Fresnel lens is made using a virtual cylindrical surface lens that overlaps and is adjacent to each other as a prototype. Thus, according to Patent Document 3, any oblique incident light is collected without loss.

  Patent Document 4 discloses a concentrating solar power generation apparatus including a position control mechanism that controls the position of a solar cell element as the sun moves so that the solar cell element coincides with the focal line portion of a linear Fresnel lens. Have been described. That is, when the incident angle of sunlight with respect to the perpendicular passing through the center of the linear Fresnel lens is α, and the angle formed by the straight line connecting the center of the linear Fresnel lens and the solar cell element is β, Control is made so that α = β = 0 at the time of south and middle, and 0.9α <β <1.3α except at the time of south and middle. Thereby, according to patent document 4, since a solar cell element can be set | placed on the peak value of the intensity distribution of the condensed light, it is supposed that a favorable solar cell output can be obtained.

  On the other hand, in Patent Document 5, in an electromagnetic energy collector for collecting solar energy, a pair of wall elements each having a reflection surface on the inner surface are inclined from the entrance to the exit so as to approach the optical axis. Is described. Thereby, according to patent document 5, it is supposed that the electromagnetic energy (light) which injected into the entrance can be made to reach an exit through one or more reflections by a reflective surface, or directly.

Japanese Patent No. 3520425 JP 2003-69069 A Japanese Patent Publication No.58-33521 Japanese Patent Publication No. 3-20074 U.S. Pat. No. 4,0036,38

  In the techniques of Patent Documents 2 to 4, since light is refracted by the Fresnel lens and condensed on the photoelectric conversion element, it is necessary to ensure a long vertical length from the Fresnel lens to the photoelectric conversion element. For this reason, the apparatus for condensing may be thick and large.

  On the other hand, Patent Document 5 describes that it is preferable to increase the height (length in the vertical direction) of a pair of wall elements. That is, Patent Document 5 does not describe how to shorten the length in the vertical direction in the configuration for condensing light onto the photoelectric conversion element.

  The present invention has been made in view of the above, and a photovoltaic power generation apparatus capable of easily reducing the length in the vertical direction in a configuration for condensing light onto a photoelectric conversion unit, and manufacture of the photovoltaic power generation apparatus The purpose is to obtain a method.

  In order to solve the above-described problems and achieve the object, a photovoltaic power generation apparatus according to one aspect of the present invention includes a photoelectric conversion unit disposed on a substrate and extending in a line shape, and collects light into the photoelectric conversion unit. A condensing unit extending in a columnar shape on the substrate, and a driving unit for driving the substrate and the condensing unit so that solar light is incident on the condensing unit, An upper surface for receiving and passing light; a first side surface extending obliquely from an edge of the upper surface so as to include the upper surface when viewed from above; and reflecting light that has passed through the upper surface; Opposite the first side surface and extending along the first side surface, the second side surface reflects the light reflected by the first side surface, and opposes the photoelectric conversion unit. , A lower surface through which the light reflected by the second side surface passes so as to be guided to the photoelectric conversion unit The a, the first aspect is characterized in that it has a curved portion so that light through the second side gathering to the photoelectric conversion unit.

  According to the present invention, since the light reflected by the first side surface after passing through the upper surface is collected to the photoelectric conversion unit via the second side surface, the path length from the first side surface to the photoelectric conversion unit to be focused Can include a lateral distance between the first side surface and the second side surface. As a result, there is an effect that it is possible to obtain a solar power generation device that can easily reduce the length in the vertical direction in the configuration for condensing light onto the photoelectric conversion unit, and a method for manufacturing the solar power generation device.

FIG. 1 is a diagram illustrating a schematic configuration of the photovoltaic power generation apparatus according to the first embodiment. FIG. 2 is a diagram illustrating the solar tracking operation of the photovoltaic power generation apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a configuration of the light collecting unit in the first embodiment. FIG. 4 is a diagram illustrating a configuration of the light collecting unit in the first embodiment. FIG. 5 is a diagram illustrating a configuration of the light collecting unit in the second embodiment. FIG. 6 is a diagram illustrating the configuration of the photovoltaic power generation apparatus according to the third embodiment. FIG. 7 is a diagram illustrating the configuration of the light collecting unit and the light intensity distribution in the fourth embodiment. FIG. 8 is a diagram illustrating a configuration of the light collecting unit in the fifth embodiment. FIG. 9 is a diagram illustrating a configuration of a light collecting unit in a modification of the fifth embodiment. FIG. 10 is a diagram illustrating a configuration of the light collecting unit according to the sixth embodiment. FIG. 11 is a diagram illustrating a configuration of the light collecting unit according to the seventh embodiment. FIG. 12 is a diagram illustrating the configuration of the light collecting unit and the light intensity distribution in the eighth embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a solar power generation device according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view illustrating a schematic configuration of the photovoltaic power generation apparatus 100 according to the first embodiment.

  The solar power generation device 100 includes a substrate 10, a member 3, a window material 1, a holding frame 2, bases 4 and 5, and a drive unit 50.

  A plurality of photoelectric conversion units 11 to be described later are arranged on the substrate 10 (see FIG. 3). Each photoelectric conversion unit 11 extends in the form of a line near the surface of the substrate 10 (see FIG. 3). The plurality of photoelectric conversion units 11 are arranged on the substrate 10 so as to be aligned with each other (for example, parallel to each other). The substrate 10 is formed of an insulator such as glass, for example. The substrate 10 also functions as a back cover that covers and protects the back surface of the member 3.

  The member 3 has a sheet shape. The member 3 is disposed on the substrate 10. The member 3 includes a plurality of light collecting portions 30 described later. Each condensing unit 30 extends in a column shape on the substrate 10 so as to collect light to the photoelectric conversion unit 11. In the member 3, the plurality of light collecting units 30 are arranged so as to be aligned with each other corresponding to the plurality of photoelectric conversion units 11 (for example, parallel to each other).

  The window material 1 is disposed on the member 3. The window material 1 is formed of a transparent material so that the light is transmitted when it receives sunlight. The window material 1 also functions as a surface cover that covers and protects the surface of the member 3.

  The holding frame 2 holds the substrate 10, the member 3, and the window material 1 from the periphery. That is, the holding frame 2 holds the plurality of light collecting portions 30 in the member 3 as a single unit.

  The pedestals 4 and 5 have the holding frame 2 on the ground, floor, wall surface, etc. (not shown) so that the orientation of the plane normal of the planar window material 1 is between southeast and southwest, preferably approximately south. Secure to. That is, the pedestals 4 and 5 support the holding frame 2 so that the surfaces of the substrate 10, the member 3, and the window material 1 are facing south, and the longitudinal direction of each condensing part 30 is along the east-west direction. . The pedestal 4 supports the west end of the holding frame 2, and the pedestal 5 (shown by a broken line in FIG. 1) supports the east end of the holding frame 2. Thereby, the longitudinal direction of each condensing part 30 is along the surface (henceforth a solar orbit surface) formed by the operation track of the sun. The pedestal 4 supports the substrate 10, the member 3, and the window material 1 so as to be rotatable about an axis along the longitudinal direction of the light collecting unit 30.

  The drive unit 50 drives the substrate 10, the member 3 (the plurality of light collecting units 30), and the window material 1 through the holding frame 2 so that the sunlight is incident on each light collecting unit 30. That is, the drive unit 50 is configured so that the angle θ formed by the normal line V (see FIGS. 2 and 3) of the upper surface 31 of the light collecting unit 30 and the horizontal plane HP coincides with the south-central altitude of the sun. The substrate 10, the member 3 (the plurality of light collecting portions 30), and the window material 1 are rotated around an axis along the longitudinal direction.

  The drive unit 50 includes an arm 51, a roller 52, a motor (not shown), and a control unit 53. The arm 51 is an arc-shaped member fixed to the holding frame 2. The motor rotates and moves the arm 51 via the roller 52 in response to a command from the control unit 53. The control part 53 is accommodated in the base 4, for example. The control unit 53 calculates the elevation angle of the solar orbit plane based on a known method, for example, a clock built in the control unit 53 and a solar orbit calculation formula, position information of the device installation location, and the installation orientation of the device. The control unit 53 operates the motor coupled to the roller 52 so that the angle θ coincides with the calculated elevation angle of the solar orbital plane (that is, the south-central altitude of the sun), and rotates the roller 52 to move the arm 51. Rotate and move. As a result, the elevation angle of the holding frame 2 to which the arm 51 is fixed and the window material 1 changes, and the normal direction of the window material 1 becomes parallel to the solar orbit plane. That is, the angle θ formed by the normal line V (see FIGS. 2 and 3) of the upper surface 31 of the light collecting unit 30 and the horizontal plane HP coincides with the south-central altitude of the sun.

  FIG. 2 is a side view illustrating the solar tracking operation of the photovoltaic power generation apparatus 100 according to the first embodiment. FIG. 2 shows the solar power generation device 100 as viewed from the horizontal direction on the west side. In FIG. 2, the right direction is south, the left direction is north, and the top is the zenith.

  Reference numeral 21 denotes a rotating shaft. S1, S2, and S3 respectively indicate the south and middle directions of the sun on the day of spring equinox (or autumn equinox), the day of summer solstice, and the day of winter solstice. P1, P2, and P3 are surfaces perpendicular to the south-south direction S1, S2, and S3 of the sun, respectively. The plane on which the pedestals 4 and 5 are installed is along the horizontal plane HP, the latitude of the installation location is L degrees, and the inclination angle between the solar orbital plane and the earth axis is E degrees. At this time, the elevation angles of the south-south directions S1, S2, and S3 of the sun are (90-L) degrees, (90-L + E) degrees, and (90-LE) degrees, respectively. Note that E is 23.4 degrees, for example.

  The drive unit 50 (see FIG. 1) performs a tracking operation so that the normal line V faces the sun in the south. The window material 1 is rotated so that the surface of the window material 1 is generally in the range of P2 to P3 throughout the year. That is, the drive unit 50 has the surface of the window material 1 along the plane P1 on the spring equinox (or autumn equinox) day, the surface of the window member 1 along the plane P2 on the summer solstice, and the window on the winter solstice. The substrate 10, the member 3 (the plurality of light collecting portions 30), and the window material 1 are rotated about the rotation shaft 21 so that the surface of the material 1 is along the plane P <b> 3.

  Here, consider the case where the collection unit 30 and the set of the photoelectric conversion unit 11 are rotated or moved momentarily when performing the tracking operation. In this case, power consumption by a motor or the like in the drive unit increases. Moreover, since it is necessary to install away from other surrounding objects so that a movable part does not contact, it is difficult to raise the utilization efficiency of an installation place.

  On the other hand, in the present embodiment, the drive unit 50 is configured so that the angle θ between the normal line V of the upper surface 31 of the light collecting unit 30 and the horizontal plane HP coincides with the south-central altitude of the sun. The substrate 10, the member 3 (the plurality of light collecting portions 30), and the window material 1 are rotated around an axis (rotary shaft 21) along the longitudinal direction. At this time, since the rotating shaft 21 and the focal line of the condensing unit 30 are substantially parallel, it is possible to track so that the condensing spot of sunlight always comes to the position of the photoelectric conversion unit 11. If the tracking angle error is large, the position of the focused spot is shifted. For example, by allowing an error of about 2 degrees, the elevation angle is adjusted intermittently once every few days or several times a day, and photoelectrical The area of the conversion unit can be prevented from becoming large. Since the control for tracking the sun with one axis is performed, the control can be simplified as compared with the case of performing the control for tracking the sun with a plurality of axes. As a result, it is possible to realize an apparatus that consumes less power for tracking, does not require azimuth tracking, and uses fewer parts.

  During the day, the azimuth angle of the sun changes moment by moment, and the sun's condensing spot moves in the longitudinal direction (perpendicular to the paper surface of FIG. 4) on the focal line, so that the light cannot be condensed at the end in the longitudinal direction of the condensing unit 30. Light is generated, and the light collection efficiency decreases accordingly. By reducing the ratio of the length of the long side W2 and the short side W1 (see FIG. 4B) of the upper surface 31 of the light collecting unit 30 to a predetermined value or more (for example, 100 times or more), light that cannot be collected is reduced. can do.

  The condensing part 30 makes each of the 1st side surface 32 and the 2nd side surface 33 which are mentioned later the reflective surface (reflecting mirror). Thereby, when there is no chromatic aberration in a condensing spot and a multijunction type photoelectric conversion element is used for a photoelectric conversion part, the difference in the electric power generation amount of each joining layer which performs photoelectric conversion can be reduced.

  FIG. 3 is an enlarged cross-sectional view of a portion including the light collecting unit 30 and the like in the first embodiment.

  As shown in FIG. 3, the member 3 is arranged between the window material 1 and the substrate 10. Within the substrate 10, the plurality of photoelectric conversion units 11 are arranged at predetermined intervals. In the member 3, the plurality of light collecting units 30 are arranged so as to be aligned with each other corresponding to the plurality of photoelectric conversion units 11 (for example, parallel to each other).

  In FIG. 3, the broken line L1 is an optical axis, and the broken lines L2 and L3 are examples of sunlight paths. First, the function of each part will be described. As shown in FIG. 3, the condensing part 30 has a substantially parallelogram-shaped cross section, and has a columnar shape extending in a direction perpendicular to the paper surface of FIG.

  Specifically, the light collecting unit 30 has an upper surface 31, a first side surface 32, a second side surface 33, and a lower surface 34.

  The upper surface 31 is a surface that receives and passes light. The upper surface 31 faces the window material 1. The upper surface 31 is adjacent to the window material 1, for example. The upper surface 31 functions as an incident surface on which light in the light collecting unit 30 is incident.

  The first side surface 32 extends obliquely from the edge 31e of the upper surface 31 so as to include the upper surface 31 when seen through from above. The first side surface 32 has a reflection function. The first side surface 32 reflects light that has passed through the upper surface 31 toward the second side surface 33.

  The second side surface 33 faces the first side surface 32 and extends while being inclined along the first side surface 32. The second side surface 33 has a reflection function. The second side surface 33 reflects the light reflected by the first side surface 32 toward the lower surface 34.

  The lower surface 34 faces the photoelectric conversion unit 11. The lower surface 34 allows the light reflected by the second side surface 33 to pass to the photoelectric conversion unit 11. For example, the lower surface 34 is adjacent to the photoelectric conversion unit 11. In this case, the lower surface 34 is substantially flush with the light receiving surface of the photoelectric conversion unit 11, which is the focal plane of the light collecting unit 30, and can be regarded as the focal surface of the light collecting unit 30.

  Here, the first side surface 32 has a curved portion so as to collect light to the photoelectric conversion unit 11 via the second side surface 33. The first side surface 32 has, for example, a portion curved along a parabola in a cross section perpendicular to the longitudinal direction. Thereby, sunlight advances from the upper surface 31 adjacent to the window material 1 to the inside of the light collecting unit 30, and is sequentially reflected by the inner surface of the light collecting unit 30, that is, the first side surface 32 and the second side surface 33. Thus, the light is condensed on the photoelectric conversion unit 11.

  For example, sunlight rays that are perpendicularly incident on the upper surface 31 travel toward the focal line along the polygonal lines L1, L2, and L3, and reach the photoelectric conversion unit 11 provided at the focal line position. A region where light is collected by the light collecting unit 30 is a linear focal line. The condensing unit 30 and the photoelectric conversion unit 11 are efficiently arranged to condense the sunlight received by the window material 1 onto the photoelectric conversion unit 11 by arranging a large number of corresponding shapes (line shape and columnar shape) on the left and right. be able to.

  Next, the manufacturing method of the solar power generation device 100 will be described.

  In the first step, a plurality of photoelectric conversion portions 11 each extending in a line so as to be aligned with each other are formed on the substrate 10. Specifically, a groove for arranging the photoelectric conversion unit 11 is formed at a position to be the light collection position of the light collection unit 30 on the substrate 10 with a width and a depth corresponding to the photoelectric conversion unit 11 to be arranged. To do. And the photoelectric conversion part 11 is arrange | positioned in the formed groove | channel. The plurality of photoelectric conversion units 11 are, for example, back contact type solar cell elements (photoelectric conversion elements) formed of single crystal silicon.

  In the second step, a plurality of light collecting units 30 that collect light to the photoelectric conversion unit 11 are formed on the substrate 10. Specifically, a columnar optical member having a shape corresponding to the light collecting unit 30 (see FIGS. 4A and 4B) is prepared. The columnar optical member has an upper surface corresponding to the upper surface 31, a first side surface corresponding to the first side surface 32, a second side surface corresponding to the second side surface 33, and a lower surface corresponding to the lower surface 34. As the columnar optical member, for example, a material formed of transparent glass or transparent plastic, for example, acrylic resin, polycarbonate resin, or polypropylene resin is prepared as a material to be the columnar optical member.

  Then, the material is made into a columnar optical member by molding, and nickel phosphorous is formed by electroless plating on the entire surface or one side surface of the columnar optical member having the same parabolic shape on both side surfaces. After mirror finishing, nickel is deposited on both sides or one side by electrolytic plating. Thereby, it is possible to reliably add the reflecting portion to the side surface of the columnar optical member.

  Then, by repeatedly arranging the plurality of columnar optical members in proximity, the plurality of light condensing units 30 are formed on the substrate 10 at positions where the light can be collected on the photoelectric conversion unit 11. Thereby, in the some condensing part 30, the 1st condensing part by which the space enclosed by the upper surface 31, the 1st side surface 32, the 2nd side surface 33, and the lower surface 34 is satisfy | filled with the columnar optical member is provided. It is arranged repeatedly. Furthermore, the window material 1 is installed on the member 3 (the plurality of light collecting portions 30). And the holding frame 2 is fitted so that the board | substrate 10, the member 3, and the window material 1 may be hold | maintained from the circumference | surroundings. As a result, the holding frame 2 holds the plurality of light collecting portions 30 in the member 3 as one body.

  In the third step, the driving unit 50 for driving the substrate 10, the member 3 (the plurality of condensing units 30), and the window material 1 is formed so that the sunlight is incident on the condensing unit 30. Specifically, the arm 51 is fixed to the holding frame 2, and the roller 52 is installed so that the arm 51 can be rotationally moved. Moreover, the control part 53 is provided so that the roller 52 can be controlled.

  In addition, you may manufacture the solar power generation device 100 as follows. After the photoelectric conversion part 11 is formed on the surface of the substrate 10 and the light condensing part 30 is arranged, the characteristics of the solar cell panel are confirmed with the substrate 10. That is, the columnar optical member is positioned and arranged on the surface of the substrate 10 so that the conversion efficiency equal to or higher than a predetermined threshold is obtained by performing the characteristic test such as the conversion efficiency measurement as an intermediate test during the manufacturing. Thereby, it becomes easy to arrange the plurality of light collecting units 30 on the substrate 10 such that the focal lines thereof coincide with the positions of the photoelectric conversion units 11. Further, the window material 1 is installed on the light collecting unit 30.

  FIG. 4A and FIG. 4B are an enlarged cross-sectional view and a perspective view, respectively, illustrating the light collecting unit 30 according to the first embodiment. As shown in the perspective view of FIG. 4B, the condensing part 30 is columnar and has four surfaces extending in the longitudinal direction, one of which is the upper surface 31, and the length of the short side of the upper surface 31 is W1 and the long side of the upper surface 31 are W2. In the cross-sectional view of FIG. 3, each of the light collecting portions 30 includes a surface having a transparent upper surface 31, a first side surface 32, and a second side surface 33 having a parabolic reflecting surface provided with a reflecting film (not shown), The lower surface 34 is a transparent surface, for example, a surface in contact with the photoelectric conversion unit 11. Since the 1st side surface 32 and the 2nd side surface 33 are substantially the same shape, the upper surface 31 becomes planar shape by arrange | positioning the condensing part 30 near repeatedly right and left.

  One of the reflective films on the first side surface 32 and the second side surface 33 may be omitted. For example, when the reflective film on the second side surface 33 is omitted, a plurality of light collecting portions 30 are arranged close to each other. Then, by optically coupling the plurality of light collecting portions 30 with a transparent resin, the first side surfaces 32 of the adjacent light collecting portions 30 are equivalent to the reflection film of the omitted second side surface 33. Function.

  The photoelectric conversion unit 11 receives the light collected on the lower surface 34 at its light receiving surface, and generates a voltage (photoelectromotive force) corresponding to the light. The polygonal line L1 is along the optical axis PA of the condensing part 30, and the solar light incident along the optical axis PA becomes a condensing spot at the focal position (focal plane). When solar light is incident on the optical axis PA at an angle, the focused spot moves on the focal plane. Therefore, taking into account the accuracy of tracking the sun, photoelectric conversion is performed to cover the moving range of the focused spot. A portion 11 is provided. As the photoelectric conversion unit 11, a type having high conversion efficiency and which does not decrease the conversion efficiency even with strong light is suitable. For example, a multi-junction type photoelectric conversion element made of a compound semiconductor is used.

  The smaller the width of the condensing unit 30 is, the smaller the amount of material used for the condensing unit 30 is, but it is preferable to arrange a large number of condensing units 30 in order to cover the light receiving window. Considering the ease of manufacturing, the length W1 of the short side of the upper surface 31 is determined in a range of approximately 1 mm to 50 mm.

  As described above, according to the first embodiment, in each condensing unit 30, the first side surface 32 has a curved portion so as to collect light to the photoelectric conversion unit 11 via the second side surface 33. Have. Thereby, since the light reflected by the first side surface 32 after passing through the upper surface 31 is collected to the photoelectric conversion unit 11 via the second side surface 33, the first side surface 32 to the photoelectric conversion unit 11 to be a focal point. The horizontal distance between the first side surface 32 and the second side surface 33 can be included in the path length. As a result, the length in the vertical direction in the configuration for condensing light onto the photoelectric conversion unit 11 can be easily reduced. Thereby, since the main-body part of a solar power generation device can be made into a thin and lightweight thing, the installation becomes easy and the extra space around an installation place becomes unnecessary. That is, it is possible to realize a solar power generation device that uses a small amount of resources and has both high power generation efficiency and high installation efficiency.

  Further, according to the first embodiment, the upper surface corresponding to the upper surface 31, the first side surface corresponding to the first side surface 32, the second side surface corresponding to the second side surface 33, and the lower surface corresponding to the lower surface 34. A plurality of light condensing portions 30 are formed by repeatedly arranging a plurality of columnar optical members having Thereby, the process for forming the structure for condensing light to a photoelectric conversion part in the manufacturing method of a solar power generation device can be simplified.

Embodiment 2. FIG.
Next, the solar power generation device 100i according to the second embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating a manufacturing method and a configuration of the solar power generation device 100 i according to the second embodiment. Below, it demonstrates focusing on a different part from Embodiment 1. FIG.

  As shown in FIG. 5, in the manufacturing method of the solar power generation device 100i, the members 3i (a plurality of light collecting portions) are formed by repeatedly arranging every other columnar optical member. FIG. 5A and FIG. 5B are cross-sectional views showing before and after assembling the process of forming a plurality of light collecting portions by arranging every other columnar optical members.

  In FIG. 5A, after the grooves are formed in the substrate 10 at a pitch equal to the horizontal width of the columnar optical member, the photoelectric conversion unit 11 is provided. After confirming the operation of the photoelectric conversion unit 11 on the substrate 10, columnar optical members having reflecting mirrors on both side surfaces are repeatedly arranged on the substrate 10 with an interval equal to the horizontal width of the columnar optical member. That is, on the substrate 10, the columnar optical members are repeatedly arranged at a pitch equal to twice the horizontal width of the columnar optical member, thereby forming the member 3i (a plurality of light collecting portions). Further, the window material 1 is installed on the member 3i (a plurality of light collecting portions). As described above, a plurality of columnar optical elements having an upper surface corresponding to the upper surface 31, a first side surface corresponding to the first side surface 32, a second side surface corresponding to the second side surface 33, and a lower surface corresponding to the lower surface 34. By disposing every other member, the amount of material used for the columnar optical member can be reduced.

  In FIG. 5B, since the interval between two adjacent columnar optical members in the member 3i (a plurality of light collecting portions) is W1 (see FIG. 4B), the space between the two columnar optical members and The columnar optical member has substantially the same shape. Since the side surface of the columnar optical member is a reflecting surface, the space between the two columnar optical members has the same optical axis and focal line as the columnar optical member.

  That is, in the member 3i (a plurality of light collecting portions), the first light collecting portions 30i1 and the second light collecting portions 30i2 are alternately and repeatedly arranged. In the first light collecting unit 30 i 1, a space surrounded by the upper surface 31, the first side surface 32, the second side surface 33, and the lower surface 34 is filled with a columnar optical member. In the second light collecting unit 30i2, a space surrounded by the upper surface 31, the first side surface 32, the second side surface 33, and the lower surface 34 is hollow.

  For example, the polygonal line L1b indicates the condensing optical axis of the second condensing unit 30i2, and the polygonal lines L2b and L3b indicate the course of sunlight. For example, the sunlight that has entered the second light collecting unit 30i2 travels along the polygonal lines L1b, L2b, and L3b, and reaches the photoelectric conversion unit 11 at the focal position. For this reason, the sunlight rays parallel to the optical axis direction received by the window material 1 are efficiently condensed on the photoelectric conversion unit 11. The outer surface of the second side surface 33 in the first light collecting portion 30i1 photoelectrically converts light through the outer surface of the first side surface 32 in the adjacent first light collecting portion 30i1 (columnar optical member). It has a curved part so that it may gather to the part 11. FIG. That is, the outer surface of the second side surface 33 in the first light collector 30i1 functions as the first side surface 32 in the second light collector 30i2, and the adjacent first light collector 30i1 (columnar optical member). ) Outside the first side surface 32 functions as the second side surface 33 in the second light collecting portion 30i2.

  Thus, even when a plurality of columnar optical members are arranged every other one, in each of the first light collecting portions 30i1 and each of the second light collecting portions 30i2, the first side surface after passing through the upper surface 31, respectively. Since the light reflected by 32 gathers to the photoelectric conversion unit 11 via the second side surface 33, the first side surface 32 and the second side length are set to the path length from the first side surface 32 to the photoelectric conversion unit 11 to be focused. A lateral distance from the side surface 33 can be included.

Embodiment 3 FIG.
Next, the solar power generation device 100j according to the third embodiment will be described with reference to FIG. FIG. 6 is a perspective view of the solar power generation device 100j according to the third embodiment. Below, it demonstrates focusing on a different part from Embodiment 1. FIG.

  The solar power generation device 100j includes a plurality of holding frames 2j1 to 2j3, an outer frame 41j, a connecting portion 42j, and a fixing member 44j.

  The plurality of holding frames 2j1 to 2j3 hold a plurality of movable units Uj1 to Uj3 each including a substrate, a sheet-like member, and a window material. That is, the holding frame 2j1 holds the movable unit Uj1 including the substrate 10j1, the sheet-like member 3j1, and the window material 1j1. The holding frame 2j2 holds the movable unit Uj2 including the substrate 10j2, the sheet-like member 3j2, and the window material 1j2. The holding frame 2j3 holds the movable unit Uj3 including the substrate 10j3, the sheet-like member 3j3, and the window material 1j3.

  The outer frame 41j rotatably supports each of the plurality of holding frames 2j1-2j3. The connecting portion 42j rotates the plurality of holding frames 2j1 to 2j3 in conjunction with each other. The fixing member 44j fixes the outer frame 41j to the ground or the roof. The outer frame 41j is fixed horizontally so that the right direction is generally the south direction. Inside the outer frame 41j, a plurality of holding frames 2j1 to 2j3, a plurality of window materials 1j1 to 1j3 held by the holding frame, a light collecting unit 30 and a photoelectric conversion unit 11 covered by the window materials 1j1 to 1j3, Are held in the same direction.

  The drive unit 50 rotates the plurality of holding frames 2j1 to 2j3 in conjunction with each other via the coupling unit 42j so that the sunlight is incident on each of the plurality of movable units Uj1 to Uj3. Specifically, the drive unit 50 further includes a sun position calculation unit (not shown) or a sun position detection unit (not shown). The control unit 53 in the driving unit 50 is fixed to the motor shaft by rotating a motor (not shown) based on the elevation angle of the sun calculated by the position calculation unit or detected by the position detection unit. The roller 52 is rotated. The roller 52 rotates the arm 51 to rotate the holding frame 2j1 at the left end, and the connecting portion 42j similarly changes the elevation angles of the holding frames 2j2 and 2j3 other than the left end.

  According to the third embodiment, the solar tracking operation can be performed by changing the directions of the plurality of holding frames 2j1 to 2j3 all at once (in conjunction with each other) via the connecting portion 42j. It is not necessary to provide the number of members such as the control unit as many as the number of holding frames (it is sufficient to provide only one holding frame), and the amount of member usage can be reduced.

  Further, since the plurality of movable units Uj1 to Uj3 are integrally held by the outer frame 41j, the solar power generation device 100j can be easily transported and installed. For example, by attaching a plurality of holding frames 2j1 to 2j3 to the outer frame 41j in advance at an apparatus assembly factory, handling work during transportation and assembly during installation can be reduced. In that case, the space around the solar power generation device 100j when the solar power generation device 100j performs the tracking operation is minimized by holding the plurality of holding frames 2j1 to 2j3 so as not to interfere with each other. Can be limited.

  A plurality of holding frames 2j1 to 2j3 may be arranged vertically, and in that case, the installation location is preferably the outer wall of the building facing the south, windows, railings on the veranda, and the like.

  Further, the outer frame 41j shown in FIG. 6 has a frame-like shape, but may be any material or shape that does not interfere with sunlight, such as a transparent plastic material or the like, and a variety of shapes such as a rod-like member. Can be modified.

  Furthermore, although the case where there are three holding frames in FIG. 6 is shown, it may be increased to, for example, 10 or more. In that case, the width of one holding frame is less than one third of the illustrated width. Since it can be made small, the height of the photovoltaic power generation apparatus 100j can be reduced overall when installed on a horizontal plane, and the thickness of the photovoltaic power generation apparatus 100j can be reduced overall when installed on a vertical plane. For this reason, it is suitable when the installation location is small, and it becomes easy to transport and install the concentrating solar power generation device.

Embodiment 4 FIG.
Next, the solar power generation device 100k according to the fourth embodiment will be described with reference to FIG. FIG. 7 is a diagram illustrating a configuration of a solar power generation device 100k according to the fourth embodiment. Below, it demonstrates focusing on a different part from Embodiment 1. FIG.

  FIG. 7A is an enlarged cross-sectional view of a portion including the condensing unit 30 and the like in the solar power generation device 100k according to the fourth embodiment. The solar power generation device 100k includes a substrate 10k.

  In addition to the plurality of photoelectric conversion units 11, a plurality of second photoelectric conversion units 12k are arranged on the substrate 10k. As shown in FIG. 7A, each second photoelectric conversion unit 12k extends along the photoelectric conversion unit 11 at a position adjacent to the photoelectric conversion unit 11 in the substrate 10k. The plurality of second photoelectric conversion units 12k are arranged on the substrate 10k so as to be aligned with each other (for example, parallel to each other).

  The second photoelectric conversion unit 12k has a lower conversion efficiency than the photoelectric conversion unit 11, and is configured at a low cost. For example, the photoelectric conversion unit 11 is a gallium indium phosphorus / gallium arsenide / germanium triple junction solar cell element (photoelectric conversion element). For example, the second photoelectric conversion unit 12k is a tandem solar cell element (photoelectric conversion element) formed of amorphous silicon. A tandem solar cell element formed of amorphous silicon has lower conversion efficiency and can be configured at a lower cost than a gallium indium phosphorus / gallium arsenide / germanium triple junction solar cell element.

  In fine weather, sunlight reaches the window material 1 along the paths indicated by broken lines L1, L2, and L3 in FIG. In this case, the light transmitted through the window material 1 is collected by the light collecting unit 30 and collected at the focal position, and reaches the photoelectric conversion unit 11 having high conversion efficiency.

  During cloudy weather, sunlight passes through the cloud and becomes diffused light, which is not only the path indicated by the broken lines L1, L2, and L3 in FIG. 7A, but also, for example, in FIG. 7A. The window material 1 is also reached along the paths indicated by the solid broken lines L4 and L5. In this case, the light transmitted through the window material 1 does not collect only at the focal point, but also reaches the second photoelectric conversion unit 12k disposed at a position adjacent to the focal point. By converting the light traveling in the direction other than the focal point into electric power by the second photoelectric conversion unit 12k arranged at a position adjacent to the focal point, the power generation efficiency in cloudy weather can be improved.

  FIG. 7B is a diagram illustrating the relationship between the light intensity of the focused spot and the position of the photoelectric conversion unit in the photovoltaic power generation apparatus 100k according to the fourth embodiment. In FIG. 7B, Pf1 shows an example of the light intensity at the time of fine weather. Pf2 shows an example of the light intensity distribution when the tracking of sunlight in a clear sky is slightly shifted. Pf3 shows an example of the light intensity distribution during cloudy weather.

  The sun is tracked so that all the collected light reaches the photoelectric conversion unit 11 in fine weather. By making the condensing spot smaller than the width of the photoelectric conversion unit 11, almost all of the collected light can be guided to the light receiving surface of the photoelectric conversion unit 11 as shown in the light intensity distribution Pf 1 or Pf 2.

  During cloudy weather, the light intensity distribution spreads broadly as indicated by the light intensity distribution Pf3, so that the light spread by the second photoelectric conversion unit 12k is received by the light receiving surface and converted into electric power. A plurality of photoelectric conversion units having different power generation efficiencies (conversion efficiencies) have different optimum output voltages and currents even when irradiated with light of the same intensity. At least two systems are provided. Thereby, it is possible to perform photoelectric conversion in an operation state utilizing the characteristics of the plurality of photoelectric conversion units.

  As described above, according to the fourth embodiment, even when light having a broad light intensity distribution when it is cloudy is incident on the light collecting unit, the light is not collected by the light collecting unit and travels in a direction other than the vicinity of the focal point. Can be received and generated by the second photoelectric conversion unit 12k. Thereby, the electric power generation at the time of cloudy weather can be increased. Moreover, since the conversion efficiency of the second photoelectric conversion unit 12k is lower than that of the photoelectric conversion unit 11, the second photoelectric conversion unit 12k can be configured at low cost, and an increase in manufacturing cost can be suppressed.

  Note that the electric power generated by the inexpensive photoelectric conversion unit (second photoelectric conversion unit 12k) may be stored in a secondary battery (not shown). In this case, the stored electric power can be used as a power source for the position calculation unit or the position detection unit (not shown) in the third embodiment.

Embodiment 5 FIG.
Next, a solar power generation device 100n according to the fifth embodiment will be described with reference to FIG. FIG. 8 is a diagram illustrating a configuration of a solar power generation device 100n according to the fifth embodiment. Below, it demonstrates centering on a different part from Embodiment 2. FIG.

  FIG. 8 is an enlarged cross-sectional view of a part including a light collecting unit (first light collecting unit 30n1, second light collecting unit 30i2) and the like in the photovoltaic power generation apparatus 100n according to the fifth embodiment. The solar power generation device 100n includes a substrate 10n and a member 3n.

  In the member 3n (a plurality of light collecting portions), the first light collecting portions 30n1 and the second light collecting portions 30i2 are alternately and repeatedly arranged. The first light collecting unit 30n1 has a lower surface 34n1. The lower surface 34n1 has a second positioning structure 30n1a corresponding to a second positioning structure described later. In other words, the second positioning structure of the columnar optical member becomes the second positioning structure 30n1a of the lower surface 34n1 of the first light collecting unit 30n1 after the columnar optical member is arranged.

  The surface of the substrate 10n has a positioning structure 15n for positioning the columnar optical member in a region where the first light collecting portion 30n1 is to be disposed (that is, a region where the lower surface 34n1 is in contact). The columnar optical member has a second positioning structure that fits the positioning structure 15n on the surface facing the substrate 10n (the lower surface corresponding to the lower surface 34n1).

  Specifically, the positioning structure 15n is a concave structure, and the second positioning structure is a convex structure that fits into the concave structure. For example, the positioning structure 15n is a positioning groove, and the second positioning structure is a positioning groove tenon that fits into the positioning groove. In this case, the manufacturing method of solar power generation device 100n differs from that of Embodiment 1 in the following points. In the first step, a plurality of positioning grooves having a predetermined width and a predetermined depth are formed on the surface of the substrate 10n at a pitch equal to the lateral width of the columnar optical member. In the second step, nickel phosphorus is deposited on the entire surface or one side surface by electroless plating, and the upper and lower surfaces are mirror-finished, and then nickel is deposited on both sides or one side surface by electrolytic plating. A positioning groove tenon is formed on the lower surface of the columnar optical member. Then, the plurality of columnar optical members are repeatedly arranged so that the positioning groove tenon is fitted into the positioning groove on the surface of the substrate 10n.

  Alternatively, the positioning structure 15n is a convex structure, and the second positioning structure is a concave structure that fits into the convex structure. For example, the positioning structure 15n is a positioning pin, and the second positioning structure is a positioning pin hole that fits into the positioning pin. In this case, the manufacturing method of solar power generation device 100n differs from that of Embodiment 1 in the following points. In the first step, a plurality of positioning pins having a predetermined width and a predetermined length are formed on the surface of the substrate 10n at a pitch equal to the lateral width of the columnar optical member. In the second step, nickel phosphorus is deposited on the entire surface or one side surface by electroless plating, and the upper and lower surfaces are mirror-finished, and then nickel is deposited on both sides or one side surface by electrolytic plating. A positioning pin hole is formed on the lower surface of the columnar optical member. Then, the plurality of columnar optical members are repeatedly arranged so that the positioning pin holes are fitted to the positioning pins on the surface of the substrate 10n.

  In addition, when forming a film on the entire surface of the columnar optical member when forming the reflection film on the first side surface and the second side surface of the columnar optical member, the reflection film formed also on the upper surface and the lower surface of the columnar optical member is polished. Since it is necessary, the second positioning structure provided on the lower surface of the columnar optical member is easier to form in the concave shape.

  According to the fifth embodiment, since the second positioning structure that fits into the positioning structure 15n of the substrate 10n is provided on the lower surface 34n1 of the first light collecting unit 30n1, the substrate of the first light collecting unit 30n1 The mounting accuracy for 10n can be easily improved. Thereby, it becomes easy to arrange the columnar optical member so that the light condensing position by the first light condensing unit 30n1 becomes the light receiving surface of the photoelectric conversion unit 11. That is, it is easy to form the first light collecting unit 30n1 on the substrate 10n so that the light collected by the first light collecting unit 30n1 becomes the light receiving surface of the photoelectric conversion unit 11.

  In addition, in the solar power generation device 100p, in addition to the plurality of photoelectric conversion units 11, a plurality of second photoelectric conversion units 12p may be arranged on the substrate 10p as illustrated in FIG. Each of the second photoelectric conversion units 12p is similar in basic configuration to each of the second photoelectric conversion units 12k in the fourth embodiment, but differs in the following points. As shown in FIG. 9, each second photoelectric conversion unit 12p extends along the photoelectric conversion unit 11 at a position adjacent to the photoelectric conversion unit 11 on the substrate 10p and where the positioning structure 15n is not formed. Yes.

Embodiment 6 FIG.
Next, the solar power generation device 100q according to the sixth embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating a configuration of a solar power generation device 100q according to the sixth embodiment. Below, it demonstrates centering on a different part from Embodiment 4. FIG.

  FIG. 10: is an expanded sectional view of the part containing the condensing part 30 grade | etc., About the solar power generation device 100q concerning Embodiment 6. FIG. The solar power generation device 100q includes a transparent resin film (protective film) 60q and a second window material 70q.

  The transparent resin film 60q covers the light receiving surfaces of the plurality of photoelectric conversion units 11 and the plurality of second photoelectric conversion units 12k. The transparent resin film 60q covers, for example, the entire surface of the substrate 10k. Thereby, the transparent resin film 60q protects the light receiving surfaces of the plurality of photoelectric conversion units 11 and the plurality of second photoelectric conversion units 12k.

  The second window material 70q is disposed on the transparent resin film 60q. The second window material 70q covers, for example, the entire upper surface of the transparent resin film 60q and the entire back surface of the member 3. Thereby, the second window material 70q functions as a back cover that covers and protects the back surface of the member 3 while protecting the transparent resin film 60q. Furthermore, when the material used for the light collecting unit 30 is deteriorated by light and the light transmittance is deteriorated, the window material 1 and the light collecting unit 30 can be easily replaced.

  According to the sixth embodiment, each of the photoelectric conversion unit 11 with high conversion efficiency and the inexpensive second photoelectric conversion unit 12k is sealed with the transparent resin film 60q and the second window material 70q. The moisture resistance of each of the unit 11 and the second photoelectric conversion unit 12k can be improved.

Embodiment 7 FIG.
Next, a solar power generation device 100r according to the seventh embodiment will be described with reference to FIG. FIG. 11 is a diagram illustrating a configuration of a solar power generation device 100r according to the seventh embodiment. Below, it demonstrates centering on a different part from Embodiment 5 and Embodiment 6. FIG.

  FIG. 11: is an expanded sectional view of the part containing the condensing part 30 grade | etc., About the solar power generation device 100r concerning Embodiment 7. FIG. The solar power generation device 100r includes a transparent resin film (protective film) 60r and a second window material 70r.

  The transparent resin film 60r has an opening 60r1 aligned with the positioning structure 15n. Thereby, the transparent resin film 60r protects the light receiving surfaces of the plurality of photoelectric conversion units 11 while avoiding the region where the positioning structure 15n is provided. The second positioning structure 30n1a provided on the lower surface 34n1 of the first light collecting unit 30n1 passes through the transparent resin film 60r through the opening 60r1. The transparent resin film 60r may further cover the light receiving surfaces of the plurality of second photoelectric conversion units 12p (see FIG. 9).

  The second window member 70r has an opening 70r1 aligned with the positioning structure 15n and the opening 60r1. Thus, the second window member 70r protects the transparent resin film 60r while avoiding the region where the positioning structure 15n is provided, and also functions as a back cover that covers and protects the back surface of the member 3n. The second positioning structure 30n1a provided on the lower surface 34n1 of the first light collecting unit 30n1 passes through the second window member 70r through the opening 70r1.

  According to the seventh embodiment, the second positioning structure that fits into the positioning structure 15n of the substrate 10n is provided on the lower surface 34n1 of the first light collecting unit 30n1, and the photoelectric conversion unit 11 is connected to the transparent resin film 60r. The second window material 70r is sealed. Thereby, it becomes easy to arrange the columnar optical member so that the light condensing position by the first light condensing unit 30n1 becomes the light receiving surface of the photoelectric converting unit 11, and the moisture resistance of the photoelectric converting unit 11 is improved. Can do.

Embodiment 8 FIG.
Next, a solar power generation device 100s according to the eighth embodiment will be described with reference to FIG. FIG. 12 is a diagram illustrating a configuration of a solar power generation device 100s according to the eighth embodiment. Below, it demonstrates centering on a different part from Embodiment 4. FIG.

  FIG. 12A is an enlarged cross-sectional view of a portion including the condensing unit 30 and the like in the solar power generation device 100s according to the eighth embodiment. The solar power generation device 100s includes a light intensity equalizing unit 21s, a light diffusion unit 22s, and an air layer 23s.

  The light intensity uniformizing unit 21 s is disposed between the light collecting unit 30 and the photoelectric conversion unit 11, uniformizes the light that has passed through the light collecting unit 30, and guides the light to the photoelectric conversion unit 11. Specifically, the light intensity equalizing unit 21s forms light having a uniform intensity distribution by repeatedly reflecting the light received on its upper surface on the left and right side surfaces, and guiding it to the photoelectric conversion unit 11.

  The light diffusing unit 22s is arranged between the light collecting unit 30 and the second photoelectric conversion unit 12k, diffuses the light that has passed through the light collecting unit 30, and guides the light to the second photoelectric conversion unit 12k. Specifically, as shown in FIG. 12A, the light diffusion portion 22s is provided with irregularities on the lower surface of a transparent member such as glass or plastic, and light passing through this surface bends its path and is inexpensive. The uneven light diffusion characteristics are set so as to spread over the entire surface of the photoelectric conversion portion 12k. The light diffusing characteristic can also be realized by a method of mixing the diffusing material with the material of the light diffusing portion 22s instead of the unevenness of the surface.

  Since the sunlight is almost a parallel light beam in fine weather, it reaches the window material 1 along the path indicated by broken lines L1, L2, and L3 in FIG. The light is condensed at the focal position, proceeds to the inside of the light intensity uniformizing section 21s, and is repeatedly totally reflected on the left and right side surfaces of the light intensity uniformizing section 21s to become light having a uniform intensity distribution. The conversion unit 11 is reached.

  When it is cloudy, sunlight passes through the cloud and becomes diffused light. In addition to the courses indicated by broken lines L1, L2, and L3 in FIG. 12A, for example, in FIG. The window material 1 is also reached along the paths indicated by the solid broken lines L4 and L5. In this case, the light transmitted through the window material 1 is not collected only by the light intensity uniformizing unit 21s arranged at the focal point by the light collecting unit 30, but also reaches the light diffusion unit 22s arranged at a position adjacent to the focal point. . In this case, the light that has reached the light diffusion portion 22s is bent in the traveling direction, further travels, and reaches the inexpensive second photoelectric conversion portion 12k.

  In FIG. 12A, the plurality of light intensity uniformizing portions 21s and the plurality of light diffusing portions 22s are shown as being integrated, but they may be separated before assembly, in which case These are joined after being arranged close to the left and right.

  In FIG. 12A, the height of the light intensity uniformizing section 21s is higher, and the light intensity can be made uniform as the number of reflections of the light that has traveled therein increases. However, more members are required. Therefore, the height of the light intensity uniformizing portion 21s is set so that most of the light is reflected from the side surface one to three times.

  In FIG. 12A, when the air layer 23s is adjacent to the light intensity uniformizing portion 21s, total reflection occurs on the inner surface of the light intensity uniformizing portion 21s due to the difference in refractive index between the two, and the light is reflected without loss. be able to. The end surface of the air layer 23s is covered (not shown) so that water and foreign matter do not enter from the outside.

  FIG. 12B is a diagram illustrating light intensity distributions on the light receiving surfaces of the photoelectric conversion unit 11 and the second photoelectric conversion unit 12k in the photovoltaic power generation apparatus 100s according to the eighth embodiment. In FIG. 12B, Pf4 shows an example of the light intensity at the time of fine weather, and Pf5 shows an example of the light intensity distribution at the time of cloudy weather.

  The sun is tracked so that all the collected light reaches the photoelectric conversion unit 11 in fine weather. By making the condensing spot smaller than the width of the entrance of the light intensity uniformizing section 21s, almost all the collected light is uniformized and guided to the light receiving surface of the photoelectric conversion section 11 as shown in the light intensity distribution Pf4. Can do.

  During cloudy weather, the light intensity distribution is further broadened as shown in the light intensity distribution Pf5 by further diffusing the light with the light intensity distribution broadened by the light diffusion part 22s, so that the second photoelectric conversion part Light having 12k spread substantially uniformly can be received by the light receiving surface and converted into electric power.

  According to the eighth embodiment, it is possible to uniformly irradiate the entire light receiving surface of the photoelectric conversion unit 11 with high conversion efficiency by uniformizing almost all of the collected light in fine weather. Thereby, compared with the case where strong light is irradiated to a part of the light-receiving surface of the photoelectric conversion unit 11, the photoelectric conversion unit 11 can be operated with high conversion efficiency.

  In addition, during cloudy weather, the light received by the second photoelectric conversion unit 12k can be received by the light receiving surface and converted into electric power, so that the second photoelectric conversion unit 12k has light with uneven intensity distribution. The second photoelectric conversion unit 12k can be operated with higher conversion efficiency than when the light is received by the light receiving surface.

  Furthermore, since the light diffusing unit 22s that diffuses the light traveling in the direction other than the entrance of the light intensity uniformizing unit 21s is provided, even when the device is used for a long period of 10 years or longer, the solar tracking operation When the tracking operation is stopped due to strong wind, interference with surrounding objects, power failure, etc., the focused spot moves to a member other than the photoelectric conversion unit and the member becomes high temperature or It is possible to prevent the life of the burnout device from being shortened.

  As described above, the solar power generation device and the solar power generation device manufacturing method according to the present invention are useful for generating power by receiving sunlight, and in particular, generating power by receiving sunlight in a narrow place. Suitable for

1, 1j1 to 1j3 Window material 2, 2j1 to 2j3 Holding frame 3, 3i, 3j1 to 3j3, 3n member 4, 5 base 10, 10j1 to 10j3, 10k, 10n, 10p Substrate 11 Photoelectric conversion unit 12k, 12p Second Photoelectric conversion unit 15n Positioning structure 21s Light intensity uniformizing unit 22s Light diffusing unit 30 Condensing units 30i1, 30n1 First condensing unit 30i2 Second condensing unit 30n1a Second positioning structure 31 Upper surface 32 First side surface 33 Second side surface 34, 34n1 Lower surface 41j Outer frame 42j Connection unit 50 Drive unit 51 Arm 52 Roller 53 Control unit 60q, 60r Transparent resin film 70q, 70r Second window material 100, 100i, 100j, 100k, 100n, 100p, 100q, 100r, 100s Photovoltaic power generator Uj1-Uj3 Movable unit

Claims (5)

A photoelectric conversion part arranged in a substrate and extending in a line;
A condensing part extending in a columnar shape on the substrate so as to collect light to the photoelectric conversion part;
A drive unit that drives the substrate and the light collecting unit so that solar light is incident on the light collecting unit;
With
The condensing part is
An upper surface that receives and passes light;
A first side surface extending obliquely from an edge of the upper surface so as to include the upper surface when viewed from above, and reflecting light that has passed through the upper surface;
A second side surface facing the first side surface and extending obliquely along the first side surface and reflecting light reflected by the first side surface;
A lower surface that faces the photoelectric conversion unit and allows the light reflected by the second side surface to pass to the photoelectric conversion unit;
Have
The first side surface has a curved portion so as to collect light to the photoelectric conversion unit via the second side surface,
The plurality of photoelectric conversion units are arranged on the substrate so as to be aligned with each other,
The plurality of condensing units are included in a sheet-like member arranged on the substrate, and are arranged so as to be aligned with each other corresponding to the plurality of photoelectric conversion units in the sheet-like member,
In the plurality of light collecting units,
A first condensing part in which a space surrounded by the upper surface, the first side surface, the second side surface, and the lower surface is filled with a columnar optical member;
A second condensing part in which a space surrounded by the upper surface, the first side surface, the second side surface, and the lower surface is hollow;
There solar power apparatus characterized by being repeatedly alternately disposed. The surface of the substrate has a positioning structure for positioning the columnar optical member in a region where the first light collecting portion is to be disposed,
The photovoltaic power generation apparatus according to claim 1 , wherein the columnar optical member has a second positioning structure that fits into the positioning structure on a surface facing the substrate. Photovoltaic device according to claim 1 or 2, further comprising a protective film covering the plurality of light receiving surface of the photoelectric conversion unit. 2. The method according to claim 1, further comprising a second photoelectric conversion unit having a lower conversion efficiency than the photoelectric conversion unit and extending along the photoelectric conversion unit at a position adjacent to the photoelectric conversion unit on the substrate. photovoltaic device according to any one of 3. A first step of forming a plurality of photoelectric conversion portions each extending in a line so as to be aligned with each other on the substrate;
A second step of forming, on the substrate, a plurality of light collecting portions that respectively collect light to the photoelectric conversion portion;
A third step of forming a drive unit that drives the substrate and the plurality of light collecting units so that solar light is incident on the light collecting unit;
With
In the second step, an upper surface that receives and passes light, and extends obliquely from an edge of the upper surface so as to include the upper surface when seen from above, and reflects light that has passed through the upper surface. A first side surface, a second side surface facing the first side surface and extending obliquely along the first side surface, and reflecting the light reflected by the first side surface; and the photoelectric conversion A columnar optical member having a lower surface facing the portion and allowing the light reflected by the second side surface to pass through to the photoelectric conversion unit, the columnar optical member in a plane parallel to the surface of the substrate Forming the plurality of light converging portions by repeatedly arranging on the substrate so as to be aligned with each other at a pitch equal to twice the width in the lateral direction of
The first side surface has a curved portion so as to collect light to the photoelectric conversion unit via the second side surface.
The outer surface of the second side surface has a curved portion so as to collect light to the photoelectric conversion unit via the outer surface of the first side surface of the adjacent columnar optical member. Photovoltaic generator manufacturing method.

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