WO2004114418A1 - Concentrating photovoltaic power generation system - Google Patents

Concentrating photovoltaic power generation system

Info

Publication number
WO2004114418A1
WO2004114418A1 PCT/JP2004/009233 JP2004009233W WO2004114418A1 WO 2004114418 A1 WO2004114418 A1 WO 2004114418A1 JP 2004009233 W JP2004009233 W JP 2004009233W WO 2004114418 A1 WO2004114418 A1 WO 2004114418A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
surface
light
incident
light guide
reflector
Prior art date
Application number
PCT/JP2004/009233
Other languages
French (fr)
Japanese (ja)
Inventor
Tokutaro Komatsu
Original Assignee
Hitachi Chemical Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046Tapered light guide, e.g. wedge-shaped light guide
    • G02B6/0048Tapered light guide, e.g. wedge-shaped light guide with stepwise taper
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075Arrangements of multiple light guides
    • G02B6/0076Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0543Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the refractive type, e.g. lenses
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0547Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/52PV systems with concentrators

Abstract

A photovoltaic power generation system has a light incident surface into which external light enters, a light-guiding body having a light emission surface, not parallel to the incident surface, for emitting the external light, and at least one photoelectric conversion element provided so as to face the light emission surface. The light-guiding body has reflection bodies for reflecting light entered into inside the light-guiding body to at least either the light incident surface or the light emission surface. The system is simple in structure, has no movable parts, which tend to cause failure, and can be installed at any place.

Description

Specification condensing type photovoltaic system technology field

This invention relates to an optical power generation system using the light guide. BACKGROUND

In order to improve the power generation efficiency of the photovoltaic system, it is necessary to collect as much light into the photoelectric conversion element per unit area. As a system to collect in this way the light beam to the photoelectric conversion element, a lens, a prism, condensed mirror, system using a condenser such as an optical fiber is known (eg example, JP-A-6 - 3 7 3 4 4 JP, Hei 1 0 2 6 4 8 9 9 No. Gazette, Laid-Open No. 5- 2 1 1 3 4 3 No.).

However, in a system using these condensing device, since the focusing point it is also shifted when the light source is shifted, in order to efficiently collect light rays movement of the light source to add tail changing the orientation of the condenser drive device is essential and the control becomes large system complex. Further, when a photovoltaic system that size, the focal length of the condenser lens or the like is increased, is very greatly in thickness and the weight becomes large facilities. Therefore, significant constraints on the installation location and the support structure of the high-efficiency photovoltaic systems that will be imposed, and is one of the factors preventing the spread of photovoltaic systems.

On the other hand, as means for solving the above-mentioned thickness and weight problems, photovoltaic systems using condensing body layered combined photoconductive layer, a light polarizing layer is proposed (e.g., JP 2 0 0 0 1 4 7 2 6 2 No.). Light deflecting layer in this case, those having a sawtooth shape with a reflective film on the lower surface, is provided separately from the photoconductive layer. In such form, the efficiency of confining the incident light to the photoconductive layer becomes very low, most of the light is leaking to the optical deflector layer stray light. Stray light repeatedly reflected light deflector layer, some would be re-emitted from the incident surface. Moreover, accompanied by reflections always losses due to reflection film. For example, the reflectance in the visible region near, 9 8% in the most reflectance silver, 9 2% Al Miniumu a 6 about 0 percent nickel. For these reflection losses and re-emitted in the light collecting member becomes very low collection efficiency of the light-receiving portion of the end surface, at most only about one percent. Disclosure of the Invention

The present invention has been such in order to solve the above problems existing photovoltaic system faced. In other words, issues of the Ma to be solved in the present invention, the intensity of complex fault causes and easier weight greater tracking type light-condensing device and that of the unnecessary location and the support structure of the photovoltaic system it is to remove the constraints on. The second challenge is to increase the power generation efficiency by reducing the amount of light regardless of the direction of the incident light is incident efficiently photoelectric conversion element, further loss of light. The present invention, by solve these problems, it shall be the purpose of the movable portion to be a failure cause the structure is simple without and provides a high-efficiency photovoltaic systems can be installed almost anywhere.

To achieve the above object, an optical power generation system according to the present invention, a plane of incidence of the external light, not parallel to the incident surface, the light guide having an exit surface for emitting the external light, 及 Pi, a photoelectric conversion element provided opposite to the emission surface is the basic configuration, the reflector is provided on the light guide, by providing the function of guiding the external light in the direction of presence of the photoelectric conversion element, a wider it is intended to provide a light power generation system as possible out to collect light incident from the incident surface having an area on the photoelectric conversion element of small area.

The present invention is to develop a reflector shaped to total reflection is received by an angle greater than the critical angle of incident light, by increasing the light condensing effect of the light guide in combination with the peripheral members, the structure is simple there is provided a high-efficiency photovoltaic systems can be installed almost anywhere.

That is, the present invention includes an incident surface, the light guide having said entrance surface that shines out of the external light and not parallel output surface, 及 Pi, photoelectric provided in pairs toward the said exit surface of the incident external light the conversion element a photovoltaic system comprising a least one, the light guide reflects the less Tomodochi Rakani the incident surface and the opposite surface thereof, it has entered the lightguide section light It shall der such a plurality of reflectors. '- The present invention is a light deflection sheet for converting the direction of the external light, it is preferable formed by opposed to the incident surface.

The present invention, a reflector for reflecting light emitted from other than the exit surface of the light guide is preferably formed by providing the opposite surface of the incident surface of the light guide.

The present invention, the reflector comprises a surface inclined with respect to the normal direction of the incident surface, and the surface preferred that made and an inclined in the opposite direction the plane arbitrarily.

The present invention, the reflector, and 2 ° ~ 6 0 ° inclined surface A with respect to the normal direction of the incident surface in a direction opposite to the A side with respect to the normal direction of the incident surface 8 is preferably made and a 0 ° ~ 8 9 ° inclined surface B. The present invention, the reflector, and 2 ° ~ 6 0 ° inclined surface A with respect to the normal direction of the incident surface in a direction opposite to the A side with respect to the normal direction of the incident surface it is preferable that the have a 3 0 ° ~ 5 0 ° inclined surface B. The present invention, the reflector, 4 0 ° with respect to the normal direction of the incident surface

And ~ 5 0 ° inclined surface A, to become and a 4 0 ° ~ 5 0 ° inclined surface B in a direction opposite to the A side with respect to the normal direction of the incident surface is preferred. The present invention, between the A face and the B face, and preferably this made a incident surface and a plane parallel.

The present invention, the light guide is a set of a plurality of light guide, the light guide of the plurality of the reflectors of the complementary structures adjoin the surface of the adjacent two light guide it is preferred that is provided. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic sectional view showing a first embodiment of the photovoltaic system that includes a light guide. '...

2, includes a light deflection sheet according to the light guide and the prism is a cross-sectional schematic view illustrating a principle of the second embodiment Oyo 'beauty its condensing photovoltaic system that involved in the present invention. The dashed line represents the path followed the incident light.

3, incident light to the light guide body, through the light guide is required to guided by total reflection, a diagram illustrating the relationship between the angle between the incident angle of the reflecting surface of the light guide. Refractive index of the light guide material was calculated as one. 5 8.

Figure 4 includes a light guide and the reflector is a schematic cross-sectional view illustrating an embodiment of the photovoltaic system of the third embodiment according to the present invention and the principles of the condenser. The dashed line represents the path followed the incident light.

5, the adjacent surfaces with light deflection sheet according to the two light guide and the prism with complementary structure, cross-section showing the principle of condensing the photovoltaic system and its fourth embodiment according to the present invention it is a schematic view. Dashed line to display the path followed the incident light.

6, the adjacent surface using a plurality of light guides with complementary structures, is a schematic sectional view showing a photovoltaic system principle of condensing the fifth embodiment according to the present invention. The dashed line represents the path followed the incident light. BEST MODE FOR CARRYING OUT THE INVENTION

It will be described in detail below with reference to best modes and operating principle for implementing the condensing optical power generation system according to the present invention in the accompanying drawings. However, each of the drawings is a schematic cross-sectional view, the dimensions of each component to the total device intended to rewrite the contents understand easily the size of the invention, does not reflect the actual dimensions.

Photovoltaic system of the present invention, as shown in FIG. 1, the external light, the input and reflecting surface 7 incident not parallel to the incident surface, the light guide to have a 'and the exit surface 8 that emits the external light body, and, a basic structure of a photoelectric conversion element provided opposite to the emitting surface.

The light guide, at least in one of the incident surface and the opposite surface thereof, a plurality of reflectors 5 for reflecting the light incident on the light guide body section is provided, guide the traveling direction of the incident light This ensures it can be converted to a wave possible angles. It shows an example in which a reflector on the opposite side of the incident surface in FIG. Incident light guided through the light guide to be condensed on the photoelectric conversion element of the end face, it is possible to improve the power generation efficiency per unit area of ​​the photoelectric conversion element.

The reflector 5 above, as shown in FIG. 1, the angle (α ΐ) inclined Α surface that is against the normal direction of the incident surface 7, and against the normal direction of the incident surface 7 A face opposite angle to the direction of ( "2) it is preferable that the inclined surface B and comprising a shape. In this way, the incident light becomes possible to totally reflect receiving at an angle greater than the critical angle, a method of providing a reflector of a specific shape for the loss of light is small, that it can achieve a high light collection efficiency in preferred.

Furthermore, In addition, for example, a method and reflector 5 forms form the reflector surface reflection film such as a metal deposition film, and the like. A method of providing a reflective film, because reflectivity can never reaches 1 0 0% when the light guided through the light guide can also be reflected multiple times by the reflecting body, there a slight reflection loss the final but in that there is a possibility that greatly reduces the light collection efficiency inferior to the former example be, there are benefits easy to manufacture. Either by choice of method may be determined depending on the application and the required photoelectric conversion capability. In the example of FIG. 1, a part of the light incident into the light guide 1 'is subjected to total reflection at one of the reflective surface 5 A of the reflector 5, the incident surface of the light guide' with respect to the normal It is deflected in a direction forming an angle greater than the critical angle. Incident light deflected is guided to the exit surface 8 of the light guide member in while play totally reflected by the upper and lower surfaces of the light guide, leading to. It changes the angle of the external light 6 entering, condensing characteristics are not significantly affected. '

As a second embodiment of the photovoltaic system of the present invention, it can be provided further light deflection sheet 3 to the configuration of FIG. Figure 2 shows an example employing a flop Rizumushi Ichito as light deflection sheet 3.

However, the operation principle of the optical deflector sheet used in the present invention is not limited to the refraction and total reflection by the downward prism. The light deflection sheet with other principles, for example, those using an interference effect of light, such as a diffraction grating, which was arranged micro-optical element such as a lens Zuarei, such that using a refraction by upward prism it can be mentioned.

Further, in FIG. 1 and 2, although the reflector 5 having the same shape that are provided continuously may be different reflector shapes are provided in a mixed manner, also be remote is between reflection member it may be. Also, the reflector may be a convex shape with respect to the light guide plate lower flat, may be concave.

In the photovoltaic system of the present invention, between the light receiving surface 9 of the exit surface 8 and the photoelectric conversion element 2 of the light guide body, in that it can reduce the reflection at the light guide end face, an intermediate light guide and a photoelectric conversion element those who are filled with a medium having a refractive index of preferably than has a space.

Next, referring to FIG. 2, light incident on the light guide body described conditions reflector shapes the incident light angle of the order to be able to guided to explain the principle of collecting light by the light guide. External light 6 incident at 0 first angle with respect to the normal direction of deflected by the light deflection sheet entrance surface 7 is refracted by the incident surface, it proceeds with a 0 second angles with respect to the normal direction.

The refractive index of the light guide is n, the reflection surface 5 A of the reflector while provided on the lower surface of the lightguide if the normal direction and the angle of the incident surface 7 and alpha, the angle of incidence 0 2, the following it is preferably within the angle range specified by the formula.

<9 2 + (90 ° - > ® sin -... 1 (丄) (1)

n

(Wherein, 0 c is the critical angle of the material of the light guide.)

Reflected light is further lightguide top surface (i.e. the incident surface 7) Conditions for guiding totally reflected by the light guide body in the traveling direction of the reflected wave with respect to the normal line Direction of the incident surface 7 the angle Θ 3 is,

θ 3 = θ 2 +2 (9 α -).> θ α ·, (2)

It is to become. 9 0 ° - Fei> from 0, lever type to established formula (1) (2) is automatically satisfied.

From Snell's law, the θ 1 and Θ 2 is

From a relationship of sm0 l = ns 0 · · · (3), the conditions for the incident light is guided through the light guide formula (1) and (3)

> «Sin. [<9 c - (90 ° -a)] · · (4)

To become.

In Figure 2, assuming a polycarbonate having a refractive index 1.5 8 as the material of the light guide, and an apex angle monument of the reflecting surface 5 A and 8 8 °. However, the present invention is not limited to these parameters. In this case, the critical angle 0 c is 3 since 9. a 2 7 °, equation (4) from 0 1> 7 3.0 8 It is ° is found to be required. If light incident on the photovoltaic system of this embodiment comes primarily from the normal direction, by setting the inlet elevation angle to the light guide plate 7 3. 0 8 ° or more by using a light deflecting film, efficient a condenser and the photoelectric conversion are possible.

3, when the reflecting surface is changed the angle a which makes with the normal direction of the incident surface 7, how the lower limit of the incident angle of the in light guide incident light is required in order to guide whether to change exemplified. Refractive index of the light guide was 1.5 8. As can be seen FIG either et immediately incident angle lower limit with respect to the angle α of the reflecting surface is monotonically increasing. That is, the larger the angle of the reflecting surface, the angular range of light collected by the light guide is subjected to strong restriction. Therefore, the angle of the reflecting surface α is preferably better somewhat smaller. Further, as shown by the arrow, in order to vertically enter Shako i.e. the angle of incidence guiding light of 0 °, the tilt of the reflecting surface must be less than about 5 0 °.

Incident light not totally reflected by the reflecting surface of the lightguide, the leaked light passes through the lower surface of the light guide. As a method for recovering such leakage light, it is preferable to form as shown in FIG. 5 from FIG. These figures are lightguide have shifted also shows a schematic diagram of assuming the refractive index 1.5 8, but the effect of the present invention is not limited to this refractive index value. Further, the convex shape with respect to the light guide member in the drawings, the reflection of the same shape is drawn, the reflector may be a concave shape with respect to the light guide, the reflector of different shapes it may be mixed.

Third embodiment of the photovoltaic system of the present invention shown in FIG. 4, the light guide and, a reflector for reflecting light emitted from other than the exit surface of the light guide, opposite to the exit surface of the light guide comprising a photoelectric conversion element provided. The reflector can be a flat reflecting surface, but as shown in FIG. 4 has a surface inclined with respect to the normal direction of the incident surface and a surface inclined in a direction opposite to its surface it is preferable to use a reflector having a comprising Te shape.

Third embodiment shown in FIG. 4 is a schematic diagram that alpha 1 and alpha 2 and respectively 5 0 ° and 7 0 °. Light directly incident on the light guide in the path a, is reflected by the anti-reflecting surface 5 A of inclination "1, guided through the light guide in changing the direction of travel from horizontal to upward 1 0 °, the exit plane 8 emitted from reaching the photoelectric conversion element. The light incident on the path b, after anti-Isa successively by the reflecting surface 5 B of the inclination alpha 1 of the reflecting surface 5 Alpha gradient a 2, by changing the traveling direction upwards 5 0 ° with respect to the horizontal direction guided through the light guide. The light incident into the light guide in the path c and d, but the once leaked light passes through the reflection plane is changed progression Direction horizontal direction by the reflecting plate having an inclined surface, into the light guide It is recovered by guiding, leading to the end face.

While each of the reflective surface 5 A and 5 B constituting the reflector 5 can take various combinations no particular restriction on the value of the normal line Direction and angle alpha 1 and alpha 2 of incident surface 7, by how the overall photoelectric conversion system configuration, there are preferred values. For example, in order to achieve a path of light shown in the third embodiment, when the refractive index of the material of the light guide body is a 1. 5 8, α 1 is 4 5 ° ~ 5 0 °, α 2 preferably from alpha it below i.e. 7 5 ° ~ 7 0 ° - is 1 2 0 °. Within this angle range, path a in Figure 4, in b, Ri total reflection to put on the reflecting surface 5 A and 5 B Oyopi lightguide top surface, it is possible to reduce the loss of light.

Further, in order to lead to the aligned with the other hand light, alpha it is 2 ° ~ 6 0 °, it is preferable shed 2 is in the range of 8 0 ° ~ 8 9 °. Ranges 6 0 ° by weight, the light of the light guide plate in be prone become scattered to the light guide plate outside is totally reflected, 2 is less than ° and light into transmitted light guide plate outside the reflective surface there is a tendency to escape. Further, the alpha 2 in a range of more than 8 9 °, too strict a limitation of the angle of incidence of the formula (4), there is a tendency that the condenser is lowered to be less than 8 0 °.

Also, in order for condensing incident light in a wide angular range, "1 2 ° ~ 6 0 °, the range is preferred. Alpha 1 in the range of (¾ 2 is 3 0 ° ~ 5 0 ° 6 0 exceeds ° light of the light guide plate in scattered to the light guide plate outside totally reflected 'has cormorants tend, 2 °' want escape light is less than is transmitted through the reflecting surface into the light guide plate outside tend to. Moreover, alpha when the second range is greater than 5 0 °, the proportion of those escaping into the light guide member bottom surface without being totally reflected in the incident light is increased, the reflecting surface is less than 3 0 ° ratio of no incident light becomes large.

Figure 5 shows the photovoltaic system of the fourth embodiment of the present invention capable of recovering the leakage light at the plurality of light guide. The fourth embodiment includes a light polarization direction sheet by the prism, a first light guide having a lower surface reflector, and a second light guide disposed adjacent to the lower side of the light guide consists photoelectric conversion element provided so as to face the exit surface of the left and right of these light guide, the first light guide body 1 reflector 5 is published only on the surface opposite to the incident surface, the 2 of the light guide 1 'is the reflector 5 above under both sides are formed. And that the light deflection sheet 3 is not limited to the prism sheet as it is shown, that the shape of the reflector 5 is not limited to the shape shown is as described above.

In the fourth embodiment, the positional relationship of the two light guides 1 and 1 'is not particularly limited. For example, it may be partially or wholly in contact, or may completely be separated. The shapes of reflectors may have a shape mating with opposite sides of 1 及 Pi 1 ', may or may not. Further, the light guide 1 and 1 'may be different lightguide der connexion of each refractive index. However, in terms of the collection efficiency of production of Chasse of or light, it is preferable that the shape of the reflector as shown in FIG. 5 leaves shape mating with opposing surfaces of 1 and 1 '.

Normal incident light became oblique light by the light deflection sheet enters the light guide in the path a 及 Pi b. Light incident on the path a while repeating total reflection by the upper light guide in guided, right photoelectric conversion element: lead:. : How, 'the light shines, the total reflection at the reflecting surface of the upper light guide: deal of:. Was Me, lower second' entry in the path b to enter the lightguide. Lower lightguide reflector is provided on each of the upper and lower 'surface. Of which the reflector of the upper surface has a complementary shape to the reflector of the upper light guide contacting phase. With complementary shape reflector in contact phase, recovered at the lower side of the light guide without changing the direction of light leakage can be effectively guided. Leakage light incident on the lower side of the light guide body, by repeating total reflection at the reflector of the upper and lower surfaces, Ru optimal to the left of the photoelectric conversion element.

FIG. 6 shows a plurality of light guides which are capable of guiding the vertical incident light, a fifth embodiment of the photovoltaic system consisting photoelectric conversion elements provided on the right end face of the light guide.

The phase contact surface of the light guide, and a reflector of complementary shape are provided with each other. Material of the light guide body 1. Was assumed to have a refractive index of 5 8, the onset Ming effect is not limited to the value of the refractive index. Further, in the drawing the same - although reflector shapes are provided at equal intervals, may have Mashimashi different reflector shapes are mixed, interval of the reflector may be unequal.

In the fifth embodiment, only the reflection surface inclined to the right is set to an angle which can all reflection of normally incident light. The light incident on the path a, undergo total reflection at the top of the light guide, is changed the traveling direction from the horizontal upwards 1 0 °, photoelectric the right end edge and guided through the light guide in the top leading to the conversion element. Light entering shines in path b is transmitted through the reflection plane inclined to the left and is incident to the second light guide in. Since the first light guide body and adjoin the reflector of the second light guide body has a complementary shape, the reflecting surface of the second light guide the incident light of b without changing the traveling direction incident to. As can capture leakage light efficiently, it is preferable that the position of the reflector disposed on the lower surface of each of the light guide is displaced to the left and right direction in FIG. The light incident on the path c; and a lower horizontal surface of the first light guide member, the second: passes through the reflecting surface inclined to the left side of the light guide body, leading to the third light guide. Light route c is totally reflected first in the third light guide to reach the right end surface of the third light guide in and guided.

As described above, in the light converging optical power generation system according to the present invention, by collecting a large portion of incident light to the end face of the light guide, the power generation efficiency of the photoelectric conversion elements provided on the end face of the light guide it can be increased. Also, since that allows for high efficiency condensing the generator regardless of the incident angle of the light beam, tracking device is not required to direct the power generator to the incident light direction, the device is miniaturized. Therefore, it becomes possible to provide a photovoltaic device to a more multi Aya place, also facilitates application to portable applications. Also, in approximately 3-fold condensing proportion of rays, it is possible to suppress the necessary area of ​​expensive photoelectric conversion elements 1 3, equipment cost can be reduced.

Claims

The scope of the claims
1. Plane of incidence of external light and,
Light guide having an entrance surface and not parallel output surface for emitting the external light, there in 及 beauty, photovoltaic systems formed by one perforated at least a photoelectric conversion element provided opposite to the emitting surface Te,
The lightguide either be a little of the incident surface and the opposite surface thereof, comprising a plurality of reflectors for reflecting the light incident on the inside the light guide
Photovoltaic system.
2. Photovoltaic system according to the light deflection sheet for converting the direction of the external light, to claim 1 comprising opposed to the incident surface.
3. Photovoltaic system according a reflector, the first term or claim 2 formed by providing the opposite surface of the incident surface of the light guide for reflecting light emitted from other than the exit surface of the light guide. -
4. The reflector has a surface inclined with respect to the normal direction of the incident surface, No mounting serial to claim 3 comprising a and inclined in a direction opposite surface to the surface of its photovoltaic system.
5. The reflector, and 2 ° to 6 0 ° inclined surface A with respect to the normal direction of the incident surface, 8 0 ° in a direction opposite to the A side with respect to the normal direction of the incident surface to 8 9 ° inclined photovoltaic system of any of the range of B-side and comprising a billing paragraphs 1 through fourth term.
6. The reflector, 3 0 ° in a direction opposite to the 2 ° to 6 0 ° inclined surface A with respect to the normal direction of the incident face, an A face with respect to the normal direction of the incident surface to 5 0 ° sloped photovoltaic system of any of the range of B-side and comprising a billing paragraphs 1 through fourth term.
7. the reflector, and 4 0 ° ~ 5 0 ° tilt swash the A plane with respect to the normal direction of the incident surface in a direction opposite to the A side with respect to the normal direction of the incident plane 4 0 ° to 5 0 ° sloped photovoltaic system of any of the range of B-side and comprising a billing paragraphs 1 through fourth term.
8. A surface and between the B side, the light power generation system according to any one of the incident surface and comprising a plane parallel claims paragraph 5 to paragraph 7.
9. a collection of the light guide member is a plurality of light guide, the plurality of lightguide reflector complementary structures adjoin the surface of the adjacent two of the light guide is provided photovoltaic system according to any of claims paragraphs 1 through 8, wherein comprising Te.
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