JP2002280595A - Solar concentrator - Google Patents

Abstract

(57) [Problem] To provide a condensing device having a large allowable incident angle and a high irradiation uniformity to a solar cell. SOLUTION: A light receiving member 101 having a first surface having a positive refractive power on which a light beam enters, and a light guide member 102 disposed subsequent to the light receiving member 101 and through which a light beam passes.
And a solar cell 10 disposed immediately after the light guide member 102.
3, the maximum cross-sectional area of the light receiving member 101 in the traveling direction of the light beam traveling in the light receiving member 101 is the maximum cross-sectional area of the light guiding member 102 in the direction of the light beam traveling in the light guiding member 102. The light receiving member 1 is larger than the area.
The light guide member 102 and the light guide member 102 are made of a material having no portion having a discontinuous refractive index, and are integrally formed so as to have substantially no interface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar light concentrator, and more particularly, to a simple, inexpensive, and high-performance solar light concentrator used in a solar power generator.

[0002]

2. Description of the Related Art In recent years, a photovoltaic power generation system using a solar cell has been attracting attention as an energy source that is safe and does not burden the environment. Emphasis has been placed on the development of more efficient and cheaper solar cells in order to be competitive in terms of performance.

[0003] From such a viewpoint, a concentrating solar cell system has been attracting attention in recent years. According to the concentrating solar cell, the most expensive solar cell among the components of the solar cell system can be greatly saved, so that an extremely large cost reduction can be achieved. In addition, since the generated voltage is increased by increasing the light intensity, the ratio of the output energy to the incident energy, that is, the conversion efficiency is improved, and a large output is obtained as compared with the case where the solar cells are spread over the same area. become.

In anticipation of such effects, Japanese Patent Application Laid-Open No. 11-2
Japanese Patent No. 61096 discloses a method of generating power by concentrating sunlight on a solar cell element using a Fresnel lens. However, in order to sufficiently obtain the above-described effects, it is necessary to employ a high-magnification light-collecting system. Generally, the higher the magnification, the smaller the effective incident angle (allowable incident angle). Therefore, the above-mentioned method has a drawback that it is too sensitive to the incident angle when condensing at a high magnification. In that case, the following adverse effects occur.

[0005] The cost of the tracking device increases because it is necessary to increase the tracking accuracy of the tracking device for holding the solar cell and directing it toward the sun.

[0006] The proportion of sunlight that can use diffused light other than direct light is reduced. Therefore, even under the same solar radiation condition, the amount of power that can be generated decreases.

On the other hand, when the distribution of light rays incident on the solar cell element is non-uniform, the electromotive force generated in each part of the solar cell becomes unbalanced, so that the energy that can be extracted while receiving the same energy is uniform. It is smaller than when it is irradiated.

Therefore, not only the light from the incident direction assumed at the time of design but also the incident direction deviated therefrom has a high optical efficiency (that is, the allowable incident angle is large) and the light incident on the solar cell element is high. Is also required for high-magnification light collection.

To solve such a problem, Japanese Patent Laid-Open Publication No.
Japanese Patent No. 272816 proposes a combination of a concave lens and a rotating parabolic mirror as a method for expanding the allowable incident angle. However, in this method, the light beam incident on the concave lens reaches a desired position through the parabolic mirror, but the condensing position by the first refraction surface is moved by changing the angle of sunlight, so that the parabolic mirror is moved. It is not possible to use light rays that do not enter the camera. That is, the allowable incident angle is determined by the aperture size of the parabolic mirror,
In general, in order to increase the size of the opening of the parabolic mirror, it is necessary to make the overall length extremely large due to the geometric characteristics of the parabola, which is not practical.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a condensing device having a large allowable incident angle and a high uniformity of irradiation on a solar cell.

[0011]

SUMMARY OF THE INVENTION The present invention has been made based on the above recognition.

That is, according to the present invention, a light-receiving member having a surface having a positive refractive power on which a light ray enters, and a light guide member disposed subsequent to the surface having a positive refractive power and passing a light ray therein. A solar cell element, and the light receiving member directs the traveling direction of the light beam to the center of the light guide member, so that the incident direction of the sunlight is shifted and the light guide member enters even when the sunlight deviates from the center. The light incident on the incident portion of the light guide member is configured to be uniform to the light density by repeated reflection in the light guide member, so that the illuminance on the solar cell element is increased. Configure to be uniform.

Further, the maximum cross-sectional area of the light-receiving member in the traveling direction of the light beam traveling in the light-receiving member is made larger than the maximum cross-sectional area of the light-guiding member in the traveling direction of the light beam traveling in the light-guiding member. Since light rays incident on an area larger than the incident area of the light guide member can be guided to the light guide member, the tolerance for the incident angle of sunlight can be increased. The cross-sectional area in this case is a cross-sectional area related to a cross section perpendicular to the average traveling direction of the light beam traveling in each member.

Further, the light receiving member and the light guide member are formed integrally using a substance having no discontinuous refractive index and having substantially no interface by injection molding or the like. The reflection loss can be reduced, and the production can be made very easily. In this case, that there is no portion where the refractive index is discontinuous means that the refractive index is substantially single, specifically, the variation is preferably within 1%, more preferably within 0.5%. Preferably, it means that the refractive index is unitary (however, unavoidable variations in manufacturing are allowed).

At this time, by arranging a refracting surface or a reflecting surface having a positive refracting power on the front surface of the light guide member, the convergence of light rays is accelerated, and a light collecting device with higher magnification can be formed.

In addition, by forming the holding member in a portion of the light receiving member where the cross-sectional area of the light receiving member is larger than the maximum cross-sectional area of the light guide member, the light path of the light beam can be blocked or the leakage loss of the light beam can be prevented. Strong retention without causing the
Can be installed.

The supporting member for supporting the light receiving member and the light guide member has an opening having a shape substantially matching the cross section of the light guide member at the joint between the light receiving member and the light guide member. By forming, the joined body of the light receiving member and the light guide member can be positioned and attached very easily.

At this time, the opening has a plurality of projections,
By positioning and supporting the light guide member at the tip of the projection, the contact area of the support member in contact with the total reflection surface can be minimized in a substantially point-like manner. It can be suppressed to the extent that there is no influence.

Further, the cross-sectional area of the incident portion of the light guide member is
By making the cross-sectional area of the light guide member larger than the exit area of the light guide member (within a range in which light guide by total reflection or the like is not hindered), the uniformization of the light beam can be expedited, and thus the length of the light guide member can be reduced. can do.

Further, by setting the size of the solar cell or the size of the power generation region of the solar cell to the same size as the exit surface of the light guide member, the sunlight emitted from the exit surface of the light guide member is efficiently guided to the solar cell. be able to.

In addition, since the light guide member is made solid, total reflection can be used, so that loss due to reflection can be eliminated.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, for example, a light receiving member 101, a light guide member 102, and a solar cell 10
3, preferably a refracting surface 104 or a reflecting surface, for example a holding member 511, a supporting member 5 as shown in FIGS.
12,712. The requirements of each component will be described below in detail.

The light receiving member is a member having an opening or a highly transmissive surface (light receiving surface) for receiving sunlight directly or via a refraction surface or a reflection surface described later.
In particular, the spirit of the present invention includes means for changing the direction of a light beam using an optical phenomenon such as refraction, reflection, or diffraction. Further, in the light receiving member, the light receiving surface is a surface having a positive refractive power. The surface having a positive refractive power is a surface configured so that light rays incident in parallel are converged at the focal point,
Specifically, it includes a commonly used lens, a Fresnel lens obtained by subdividing the lens, a so-called distributed refractive index lens configured to have a finite focal length by giving a distribution to the refractive index, and the like.

Specifically, it includes a so-called lens or prism that changes the direction of a light beam using refraction by using a transparent body such as glass, transparent resin, or a sealed liquid, and further includes vapor deposition on glass or resin. Metal and smooth metal surfaces, as well as resin films and plates that aim to enhance the reflection effect by laminating many resin thin films in multiple layers.

The light-guiding member is a means for guiding the light beam guided to a desired position by the light-receiving member to a solar cell, which will be described later, with less loss, and at the same time, to uniform the spatial existence density of the light beam. Specifically, like the above-mentioned light receiving member, a transparent block-like shape in which light rays repeatedly travel inside the transparent body using the total internal reflection of a transparent body such as glass, transparent resin, or a sealed liquid is used. Member is included.

A solar cell is a member including a photoelectric conversion element for converting sunlight energy into electric energy, and a single or plural members configured to receive sunlight and generate an electric output. Can use a photoelectric conversion element such as silicon, gallium arsenide, cadmium telluride, or copper indium selenide, but is not limited to the above, and can include all elements that realize the same function.

With respect to the shapes of the light receiving member, the light guide member, and the solar cell described above, any cross-sectional shapes including a rotating shape and a rectangular shape can be considered.

The holding member refers to a means for fixing the light receiving member and the light guide member on a device. For the purpose of the present invention, a wall or a claw formed on the outer edge of the light receiving member is used. The light receiving member and the light guide member by fixing the holding member on the device by various methods such as screwing, caulking, bonding, welding, C-ring fixing, press fitting, welding, and the like. And to prevent mechanical movement of The shape can be arbitrarily set by the fixing method described above.

The support member refers to an object on which the light receiving member and the light guide member are fixed on the device, and is a plate-like member or a block-like member fixed on the device, and Openings, protrusions, holes, and the like for fixing the light guide member are formed.

The refracting surface is a member having a function of changing the traveling direction of the light beam to a desired angle so that the sunlight reaches a predetermined portion by utilizing the refraction phenomenon on the surface of the transparent medium. Specifically, it means a lens or a prism. In particular,
For the purposes of the present invention, it refers to a member that has a positive power and that functions to focus parallel light.

The reflecting surface is used for the same purpose as the refracting surface, but uses a reflection phenomenon as a method of changing the angle of a light beam, and condenses sunlight using a material having a high reflectance. It is.

The refracting surface and the reflecting surface may be used individually, or may be used at the same time to enhance the light collecting effect.

In the above, for convenience, individual functions have been described as being provided with individual means. However, it is needless to say that a single means can serve a plurality of functions, and conversely, one means May consist of multiple elements.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the above claims will be described below, but the substantial content of the present invention is not limited to the specific description of the following embodiments.

<Embodiment 1> FIGS. 1 and 2 show a first embodiment of the present invention.

FIG. 1 schematically shows relevant parts of the light-collecting device according to the present invention. In this figure, 10
1 is a light receiving member according to the present invention, and 102 is a light guide member according to the present invention. The light receiving member 101 and the light guide member 102 are integrally injection-molded with a transparent acrylic resin (refractive index: 1.49). 103 is a solar cell, and the light guide member 1
02 is bonded to the bottom surface (emission surface) using a transparent adhesive. Here, the dimensions of the solar cell 103 and the light guide member 10
The size of the exit surface of No. 2 substantially coincides with the size of the exit surface.

Numeral 104 denotes a refracting surface, and the sunlight 105 vertically incident enters the light receiving member 101 along the solid line in FIG.
3 and partly on the inner surface of the light guide member 102 when traveling in the light guide member 102, the reflectance of which is theoretically 100
% Of total reflection is performed. In this way, sunlight 1
05 reaches the solar cell 103 in a state where the energy density is very high and the light beam density is uniform.

On the other hand, in the drawing, reference numeral 106 denotes a state where light is incident at a certain angle from the above-mentioned incident angle. The obliquely incident sunlight 106 travels toward the opposite side to the incident direction as compared with the sunlight 105, and without the light receiving member 101, follows the path indicated by a dashed line 107 in the figure to a point 108 in the figure. And many light beams do not enter the light guide member 102.

However, since the light receiving member 101 is larger than the light guide member 102 and the front surface is convex, the light ray follows the path indicated by the dotted line in the light guide member 102 and the vicinity of the point 109. Focus on Therefore,
The sunlight 106 also enters the light guide member 102 like the sunlight 105 and reaches the solar cell 103.

Therefore, by adopting the above configuration, the angle range (allowable incident angle) of the light beam that can enter the light guide member 102 can be expanded.

Although FIG. 1 is drawn in two dimensions to facilitate the description of the above function, the actual form is as shown in FIG. 2 in which a circular light receiving member 101 and a rectangular light guide member 102 are used. A solar cell 103 is used. Light guide member 102
Is rectangular because the light receiving surface of the solar cell 103 is rectangular. In addition, the symbol in the figure used the above-mentioned symbol.

With the above configuration, the allowable incident angle of the light condensing device is greatly increased, and the diffused light from the vicinity of the sun can be effectively used in the solar cell.

In this embodiment, the primary condensing is performed by using the refraction surface 104. However, optically, even if the primary condensing is performed by the reflecting mirror, the traveling direction of the light beam can be improved. However, the effect is exactly the same except that is reversed, so that the method using the reflecting mirror is omitted.

<Embodiment 2> FIGS. 3 and 4 show a second embodiment according to the present invention.

In this embodiment, the refracting surface 104 of the first embodiment is replaced by a Fresnel lens 304. As is well known, the Fresnel lens 304 is a flat lens formed by replacing a single lens with a prism subdivided in a circumferential direction.

In the figure, members having the same functions as in the first embodiment are denoted by the same symbols. Reference numeral 302 denotes a light guide member. In this embodiment, a light guide member having a circular cross section (a column) is used. In FIG. 4, reference numeral 303 denotes a solar cell. In this embodiment, as shown in FIG. 4, a silicon single crystal solar cell in which a power generation region 303a is provided on a rectangular solar cell substrate in a circular shape. As shown in the figure, the light guide member 302 has a circular exit surface having substantially the same dimensions as the power generation region 303a.

Other configurations, materials, functions, and operations are the same as those in the first embodiment, and a description thereof will be omitted.

<Embodiment 3> FIGS. 5 and 6 show a third embodiment of the present invention. In the figure, reference numeral 501 denotes a light receiving member, 502 denotes a light guide member, and 503 denotes a solar cell. The function of each part is the same as that of the first embodiment, and the description is omitted.
Although not shown, in this embodiment, as in the first embodiment, sunlight incident on the light receiving member 501 is once collected by a lens or a reflecting mirror disposed on the front surface thereof, and the light is collected. The light beam being emitted is reflected by the light receiving member 5.
01.

The sunlight 506 is vertically incident sunlight 505.
Represents a limit incident state in which the incident angle is shifted and passes through the light receiving member 501 to reach the outer edge of the light guide member 502. In this state, the light receiving member 501 is located in an area 501 through which no light beam passes.
a. In the region 501a, the light path of the sunlight 506 is changed because the front surface of the light receiving member 501 is in a convex state.

The holding member 511 protrudes from the area 501a. In the case of the present embodiment, the support member 512 is a plate member that also supports the solar cell 503 at the same time. Therefore, the holding member 511 is moved from the region 501a to the support member 5.
Stretched in 12 directions to form a stretched portion 511a,
Further, a fixing portion 511b is formed continuously outside along the surface of the support member 512. A hole and a screw hole are formed at corresponding positions in the fixing part 511b and the support member 512, and the light receiving member 501 uses the hole and the screw hole to support the support member 5 via a screw 513.
12 is fixed.

With the above configuration, the light receiving member 501 and the light guide member 502 can be firmly fixed to the support member 512 without blocking or leaking sunlight.

FIG. 6 shows the above configuration three-dimensionally. In the case of this embodiment, since the holding member 511 is formed so as to surround the outer periphery of the light guide member 502, adhesion of foreign matter, dirt, dust, etc. to the surface of the light guide member 502 is prevented, and the entire inner surface is prevented. Since the reflection performance is not degraded and the attachment of oil and the like during the assembly can be prevented, the configuration is advantageous in terms of manufacturing.

In this embodiment, the extending portion 511a and the fixing portion 511b are formed over the entire outer periphery of the light guide member 502. However, it is also possible to form only a minimum necessary portion to save material. .

<Embodiment 4> FIGS. 7 and 8 show a fourth embodiment of the present invention. This embodiment is an embodiment in which a light receiving member 701, a light guide member 702, and a solar cell 703 having the same shapes as those of the second embodiment are supported by a support member 712. Although not shown, in this embodiment, as in the first embodiment, sunlight incident on the light receiving member 701 is once collected by a lens or a reflecting mirror disposed on the front surface of the light receiving member 701. The light beam being emitted is incident on the light receiving member 701.

In the drawing, a support member 712 is a plate-like member and has a substantially same shape as the light guide member 702 at a predetermined position.
An opening 715 having substantially the same dimensions is formed. Three substantially hemispherical projections 713 are formed inside the opening 715, and a circle 811 contacting the tip of the projection 713 is configured to have a diameter slightly smaller than the diameter of the light guide member 702. ing.

Therefore, the light guide member 702 can be accurately positioned in the plane of FIG. 8 by being recessed into the opening 715. Further, since the light receiving member 701 has a larger cross-sectional area than the maximum cross-sectional area of the light guide member 702, if the light guide member 702 is continuously pushed in until the light receiving member 701 contacts the support member 712, The positioning of the light receiving member 701 in the vertical direction in FIG. 7 can be automatically performed easily.

Furthermore, since the contact is performed in a point-like manner by the projection 713, the area of the contact portion with a foreign substance which normally impairs the total reflection efficiency can be minimized, so that the optical loss of the light guide member 702 can be suppressed to a small value. Can be.

In the present embodiment, the projection 713 is hemispherical and the number of projections is three. However, it is needless to say that the shape and number can be set arbitrarily from the intention of the present invention. Further, in the present embodiment, the light guide member 702 is fixed by press-fitting into the opening 715, but bonding or welding may be performed in a region 714 shown in FIG. 7 for reinforcement in terms of strength.

<Embodiment 5> FIG. 9 shows a fifth embodiment of the present invention. In the first to fourth embodiments, the columnar body having a uniform cross-sectional area is used as the light guide member. However, the present embodiment is characterized in that the light guide member 902 having a shape in which the cross-sectional area gradually decreases is used. That is, the cross-sectional area of the entrance end 902a of the light guide member 902 is set to be larger than the cross-sectional area of the exit end 902b.
As a result, the manner in which the sunlight 905 is totally reflected approaches the direction perpendicular to the reflecting surface as the light beam travels, thereby promoting uniformity.
Although not shown, also in the present embodiment, the first embodiment
Similarly to the above, the sunlight incident on the light receiving member 901 is once collected by a lens or a reflecting mirror disposed in front of the light receiving member 901, and the light beam being condensed is reflected by the light receiving member 901.
1 is adopted.

In this case, it is necessary to set the cross-sectional area of the light guide member 902 such that the cross-sectional area of the light guide member 902 reaches the solar cell 903 before the incident angle in the reflection reaches the critical angle which is the limit angle at which total reflection occurs. By inclining the side surfaces to the limit, the light guide member 902 required to obtain the desired uniformity
The length 911 of the device can be reduced as compared with the above-described embodiment, and thus the size and weight of the entire device can be reduced.

Further, since a large incident end 902a can be used for a solar cell 903 of the same size, there is an advantage that the allowable incident angle can be increased.

In the figure, the light receiving member 901, the solar cell 9
03 is the same as Example 1 in terms of shape, material, function, operation, and the like, and thus description thereof is omitted.

<Embodiment 6> FIG. 10 shows a sixth embodiment of the present invention.

In the embodiments described above, the solar light incident on the light receiving member is once collected by a lens or a reflecting mirror disposed in front of the light receiving member, and the light beam being collected is incident on the light receiving member. However, this embodiment shows an embodiment in which the light receiving member receives substantially parallel sunlight. In the figure, sunlight 1005 enters the light receiving member 1001 substantially in parallel, is condensed on a convex surface formed on the front surface of the light receiving member 1001, and enters the light guide member 1002. The incident light beam travels while performing total reflection as in the first embodiment, and reaches the solar cell 1003.

In the figure, reference numeral 1006 denotes a situation when the sunlight 1005 enters at an angle other than vertical.

When the light receiving member 1001 is not provided, the sunlight 1006 follows the process shown by the dashed line in FIG.
02, and enters the solar cell 1003, or enters the light guide member 1002 from the side surface of the light guide member 1002, and reaches the solar cell 1003. However, a considerable portion cannot reach the solar cell 1003.

However, the presence of the light receiving member 1001 causes light rays to be guided from the center of the light receiving member 1001 and to enter the light guide member 1002, so that all light rays can reach the solar cell 1003.

Therefore, with the above configuration, the light receiving member 1
When the light-collecting device including 001 is used under substantially parallel sunlight, incident light can be guided to the solar cell 1003 even when the direction of the sun does not coincide with the axial direction of the light-collecting device. Even when the direction of the sun is coincident with the axial direction of the light collecting device, sunlight components other than so-called direct light directly entering from the sun, that is, scattered light can be effectively used.

<Embodiment 7> FIG. 11 shows a seventh embodiment of the present invention.

In this embodiment, while the above-described embodiment has a configuration based on axial symmetry, the present invention is applied to a so-called linear condensing device having a surface.

The function of each part of the light receiving member 1101, the light guide member 1102, and the solar cell 1103 is the same as that shown in the fifth embodiment, and therefore, the detailed description is omitted.

As described above, the present invention is also effective in a linear type light collecting device.

[0073]

As described above, according to the present invention, a light receiving member having a surface having a positive refractive power on which a light beam is incident, and a light receiving member which is arranged following the surface having a positive refractive power and which has the inside formed therein. It has a light guide member and a solar cell element through which the light beam passes, and by moving the traveling direction of the light beam to the center of the light guide member by the light receiving member, the incident direction of sunlight is shifted and deviated from the center. At the time, the light guide member is configured to be incident on the incident portion, and for the light beam incident on the incident portion of the light guide member, the light density is made uniform by repetitive reflection in the light guide member, whereby The illuminance on the solar cell element could be configured to be uniform.

Further, the maximum cross-sectional area of the light-receiving member in the traveling direction of the light beam traveling in the light-receiving member is made larger than the maximum cross-sectional area of the light-guiding member in the traveling direction of the light beam traveling in the light-guiding member. Since light rays incident on an area larger than the incident area of the light guide member can be guided to the light guide member, the tolerance for the incident angle of sunlight can be increased.

Further, the light receiving member and the light guide member are made of a material having no portion having a discontinuous refractive index, and are integrally formed so as to have substantially no interface by injection molding or the like. Reflection loss has been reduced, and it has become very easy to manufacture.

At this time, by arranging a refracting surface or a reflecting surface having a positive refracting power on the front surface of the light guide member, the convergence of the light beam was sped up, and a light condensing device with higher magnification could be formed.

Further, by forming the holding member in a portion of the light receiving member where the cross-sectional area of the light receiving member is larger than the maximum cross-sectional area of the light guide member, the light path of the light beam can be blocked or the leakage loss of the light beam can be prevented. Strong retention without causing the
I was able to install it.

Further, the supporting member for supporting the light receiving member and the light guide member has an opening having a shape substantially corresponding to the cross section of the light guide member at the joint between the light receiving member and the light guide member. By forming, the joined body of the light receiving member and the light guide member can be extremely easily positioned and attached.

At this time, the opening has a plurality of projections,
By positioning and supporting the light guide member at the tip of the projection, the contact area of the support member in contact with the total reflection surface can be minimized in a substantially point-like manner. It was able to be suppressed to the extent that there was no effect.

Further, the cross-sectional area of the incident portion of the light guide member is
By making the cross-sectional area of the light guide member larger than the exit area of the light guide member (within a range in which light guide by total reflection or the like is not hindered), the uniformization of the light beam can be expedited, and thus the length of the light guide member can be reduced. We were able to.

Further, by setting the size of the solar cell or the size of the power generation region of the solar cell to the same size as the exit surface of the light guide member, the sunlight emitted from the exit surface of the light guide member is efficiently guided to the solar cell. I was able to.

Further, by making the light guide member a solid body, total reflection can be used, so that loss due to reflection can be eliminated.

As described above, a light-collecting device which is inexpensive, easy to manufacture, has a high utilization factor of sunlight, and has a uniform light-collecting state can be constructed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention.

FIG. 2 is a perspective view of the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a solar cell used in a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a third embodiment of the present invention.

FIG. 6 is a perspective view of a third embodiment of the present invention.

FIG. 7 is a diagram for explaining a fourth embodiment of the present invention.

FIG. 8 is a diagram illustrating a support member according to a fourth embodiment of the present invention.

FIG. 9 is a diagram illustrating a fifth embodiment of the present invention.

FIG. 10 is a diagram for explaining a sixth embodiment of the present invention.

FIG. 11 is a diagram for explaining a seventh embodiment of the present invention.

[Explanation of symbols]

101, 501, 701, 901, 1001, 1101
Light receiving members 102, 302, 502, 702, 902, 1002,
1102 Light guide members 103, 303, 503, 703, 903, 1003,
1103 Solar cell 104 Refraction surface 105, 505, 905, 1005 Sunlight 106, 506, 1006 Deviated sunlight 107, 1007 Light beam 108, 109, 1009 Focus point 304 Fresnel lens 511 Holding member 512, 712 Support member 513 Screw 713 Projection 714 Area 715 Opening 911 Length

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H043 BD02 BD21 2H087 KA27 RA07 RA47 TA01 TA02 TA04 5F051 BA11 JA13 JA14

Claims (9)

[Claims] 1. A light receiving member having a first surface having a positive refractive power on which a light beam enters, a light guide member disposed subsequent to the light receiving member and through which a light beam passes, and a light guide member of the light guide member Having a solar cell disposed immediately after, the maximum cross-sectional area of the light receiving member with respect to the traveling direction of the light beam traveling in the light receiving member, A light-receiving member and a light-guiding member which are larger than a maximum cross-sectional area, are made of a material having no portion having a discontinuous refractive index, and are integrally formed so as to have substantially no interface. Light device. 2. The light condensing device according to claim 1, wherein a refracting surface having a second positive refracting power or a reflecting surface is disposed on a front surface of the light receiving member. 3. The light-receiving member according to claim 1, wherein a holding member is formed on the light-receiving member at a portion where a cross-sectional area of the light-receiving member is larger than a maximum cross-sectional area of the light-guiding member. The condensing device according to the above. 4. A supporting member for supporting the light receiving member and the light guide member, wherein the support member corresponds to a cross section of the light guide member at a joint between the light receiving member and the light guide member. The light-collecting device according to claim 1, further comprising an opening having a shape. 5. The light-collecting device according to claim 4, wherein the opening has a plurality of protrusions, and the light guide member is supported at the tips of the protrusions. 6. The light-collecting device according to claim 1, wherein a cross-sectional area of an incident portion of the light guide member is larger than a cross-sectional area of an exit portion of the light guide member. 7. The light-collecting device according to claim 1, wherein the size of the solar cell and the exit surface of the light guide member are the same. 8. The light-collecting device according to claim 1, wherein a size of a power generation area of the solar cell and an emission surface of the light guide member are the same. 9. The light-collecting device according to claim 1, wherein the light guide member is a solid body.