CN103424857B - solar concentrator - Google Patents

Abstract

A solar concentrator is provided with a first side and a second side which are opposite, and comprises a first light guide module and a second light guide module. The first light guide module is provided with a first surface, a first reflecting surface and a first adapter reflecting surface, wherein the first surface and the first adapter reflecting surface are positioned on the first side, and the first reflecting surface is positioned on the second side. The second light guide module is provided with a second surface, a second reflecting surface and a second switching reflecting surface, the second surface and the second switching reflecting surface are positioned on the first side, the second reflecting surface is positioned on the second side, and the extending convergence point of the light rays leaving the second surface is substantially concurrent with the extending convergence point of the light rays leaving the first switching reflecting surface. The solar light collector has the advantage of thinness, so that the material cost of the solar light collector is reduced, and the solar light collector is convenient for various applications.

Description

solar concentrator

technical field

The present invention relates to a solar concentrator.

Background technique

Due to the gradual depletion of natural resources such as oil and coal, more and more researches on solar energy have been developed. The disadvantage of solar energy application technology is that the conversion efficiency of solar energy is low, but compared with other traditional energy conversion methods, the cost Therefore, improving the utilization efficiency of solar energy and reducing the conversion cost of solar energy have become important research goals in recent years.

In order to improve the utilization efficiency of sunlight, one of the methods is to use a solar concentrator combined with a light guide component module to guide sunlight through the light guide component and conduct it to solar cells or heat conduction components to increase the efficiency of sunlight. Collecting efficiency, thereby improving the production efficiency of solar energy conversion devices. The known solar energy conversion device requires a solar concentrator to gather the incident sunlight to multiple focal points on the light output side for use by solar cells or heat conduction components. However, the focal length of the light-gathering device causes a huge volume of the known solar conversion device. The large-volume solar conversion device not only needs to consume higher production and material costs, but is difficult to precisely move and control the sun tracking (Solartracking), and also requires a large The installation area of the area.

Therefore, how to provide a solar concentrator with the advantage of being thinner, thereby reducing the material cost of the solar concentrator so as to facilitate various applications has become an important issue at present.

Contents of the invention

The object of the present invention is to provide a solar collector, which has the advantage of being thinner, thereby reducing the material cost of the solar collector.

The present invention can be realized by adopting the following technical solutions.

A solar concentrator of the present invention has a first side and a second side opposite to each other, and the solar concentrator includes a first light guiding module and a second light guiding module. The first light guide module has a first surface, a first reflective surface and a first transfer reflective surface, the first surface and the first transfer reflective surface are located on the first side, and the first reflective surface is located on the second side. The second light guide module has a second surface, a second reflective surface and a second transfer reflective surface, the second surface and the second transfer reflective surface are located on the first side, and the second reflective surface is located on the second side, The light is incident on the first surface of the first light guide module, reflected by the first reflective surface and transmitted in the first light guide module, and then reflected by the first transfer reflective surface to the second light guide module.

In one embodiment, the converging point of the light rays leaving the second surface is substantially co-pointed with the converging point of the light rays leaving the first transfer reflective surface.

In one embodiment, the allowable error distance between the extended converging point of the outgoing light rays on the second surface and the extended converging point of the outgoing light rays on the first transfer reflective surface is d, and the extended converging point of the outgoing light rays on the second surface The distance between the second surface and the second surface is L ₁ , and the distance between the extended converging point of the leaving light of the first transfer reflective surface and the first transfer reflective surface is L ₂ , which satisfies the following inequality:

In one embodiment, the first light guide module and the second light guide module are arranged side by side. Preferably, the direction in which the first light guiding module and the second light guiding module are arranged side by side is substantially parallel to the main direction in which light is guided.

In one embodiment, the first light guiding module and the second light guiding module are arranged in a concentric circle, and the light is mainly guided to the center of the concentric circle.

In one embodiment, the light reflected by the first transfer reflective surface hits the second reflective surface of the second light guide module.

In one embodiment, the light is reflected by the first transfer reflective surface to form parallel light, which is substantially parallel to the direction of the light after passing through the first surface or the second surface.

In one embodiment, the first surface and/or the second surface is a plane, a convex surface, a concave surface, or a wedge-shaped surface. It should be noted here that the convex or concave surface mentioned in the description is defined from the point of view of the light traveling path when it touches the surface, rather than the appearance of the light guide module.

In one embodiment, the first reflective surface and/or the second reflective surface and the first transfer reflective surface and/or the second transfer reflective surface are respectively aspherical surfaces or freeform optical surfaces.

In one embodiment, the shape of the first light guiding module and/or the second light guiding module is ring, straight or curved.

In an embodiment, the first light guiding module and the second light guiding module include light-transmitting materials.

In one embodiment, the solar concentrator further includes an accommodating module connected to the first light guiding module or the second light guiding module, and the accommodating module has an accommodating portion for accommodating a photoelectric conversion component or a thermal energy transfer medium. Wherein, the accommodating portion is located on the first side or the second side, or between the first side and the second side.

In one embodiment, the first light guide module and the second light guide module have a guide body, and the first side and the second side are located on opposite sides of the guide body.

In one embodiment, the first light guide module and the second light guide module further include a first lens and a second lens oppositely arranged, the first lens includes a first side, a first surface, a second surface, The first transfer reflective surface and the second transfer reflective surface, the second lens includes a second side and the first reflective surface and the second reflective surface.

In one embodiment, the solar concentrator further includes at least one light concentrating component, which is arranged on the first side of the first light guide module and the second light guide module, and the light is collected to the first surface and the first surface by the light concentrating component. The second surface, and the light converging component adjusts the passing light to maintain the image point on the second surface substantially co-pointed with the image point on the first transfer reflection surface.

In one embodiment, the first surface, the second surface, the first reflective surface, the second reflective surface, the first transfer reflective surface and the second transfer reflective surface are curved surfaces, Fresnel (Fresnel) surfaces or diffraction (diffractive) face.

In one embodiment, the first surface, the second surface, the first reflective surface, the second reflective surface, the first transfer reflective surface, and the second transfer reflective surface are total internal reflection (total internal reflection) surfaces, or optical high reflection surfaces noodle.

Based on the above, the solar concentrator of the present invention forms a plurality of light guide modules through multiple surfaces, reflective surfaces and transfer reflective surfaces to achieve the effect of guiding light, and through the image points on the surface of the solar concentrator The substantially co-point with the image point of the transfer reflective surface of the previous light guide module enables the incident light to be accurately and gathered to a focal point in addition to being guided. Compared with the known ones, the solar concentrator of the present invention reduces the axial traveling distance needed to focus the light, thereby reducing the thickness of the whole solar concentrator, thereby achieving the goal of thinning. In this way, not only the material cost of the solar concentrator is greatly reduced, but also the utilization rate of sunlight can be improved, and the solar energy conversion device with the solar concentrator of the present invention can be conveniently used under various installation conditions, or under various conditions. application in limited space.

Description of drawings

Fig. 1 is the sectional schematic view of the solar concentrator of the first embodiment of the present invention;

Fig. 2A is a top view and a sectional view of the solar concentrator of the first embodiment of the present invention;

Fig. 2B is a top view and a cross-sectional view of solar concentrators of different implementation styles in the first embodiment of the present invention;

3A and 3B are top views of solar concentrators in different implementations of the second embodiment of the present invention;

4 is a top view and a sectional view of a solar concentrator according to a third embodiment of the present invention;

5A and 5B are partial cross-sectional views of solar concentrators in different implementations of the fourth embodiment of the present invention;

5C is a partial cross-sectional view of another implementation of the solar concentrator according to the fourth embodiment of the present invention; and

FIG. 6A , FIG. 6B and FIG. 6C are partial cross-sectional views of solar concentrators in different implementations of the fifth embodiment of the present invention.

Description of main component symbols:

1, 2a, 2b, 3, 4a, 4b, 4c, 5a, 5b, 5c: Solar concentrators

11, 11a, 21a, 21b, 31, 41a, 41b, 51, 51a: the first light guide module

111, 211, 411a, 411b, 411c, 511a, 511b, 511c: first surface

112, 212, 412: first reflective surface

113, 113a, 213, 413, 513: the first transfer reflection surface

12, 22a, 22b, 32, 42a, 42b, 52: second light guide module

121, 421a, 421b, 421c, 521a, 521b, 521c: second surface

122, 422: second reflective surface

123, 423, 523: second transfer reflective surface

13, 23a, 23b, 33, 53: Accommodating modules

131, 531c: surface

132: reflective surface

133, 233, 333, 533: storage part

55a, 55b, 55c: light gathering components

D1, D2, D3, D4: direction

d, L1, L2: distance

L: light

M: solar cell

M1, M1a: first lens

M2, M2a: second lens

M3: third lens

M4: fourth lens

MB, MBa, MBc: guide ontology

P ₀ , P ₁ , P ₂ : image points

S1: First side

S2: second side

z: optical surface

r: lateral distance

detailed description

A solar concentrator according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference numerals.

FIG. 1 is a schematic sectional view of a solar concentrator according to the first embodiment of the present invention, and FIG. 2A is a top view and a sectional view of the solar concentrator according to the first embodiment of the present invention.

As shown in Figure 1 and Figure 2A, the solar concentrator 1 has a first side S1 and a second side S2 opposite, and here, the solar concentrator 1 is an example of a concentrator for collecting sunlight, and the solar concentrator 1 The solar concentrator 1 is incident from the first side S1, so the first side S1 is the light-incident side, and the second side S2 opposite to the first side S1 is the backlight side, and the solar concentrator 1 includes two first lights. The guide modules 11, 11a and a second light guide module 12 are described as examples, however, the number of the first light guide module 11 and the second light guide module 12 can be increased or decreased according to actual needs, so as to adjust the concentration of solar energy The size of the device 1 is not intended to limit the present invention. In addition, in this embodiment, the shape of the solar concentrator 1 is plate-like as an example. However, in other implementations, for example as shown in FIG. 2B , the top view shape of the solar concentrator 1 is strip-shaped as an example.

The first light guide module 11 has a first surface 111, a first reflective surface 112 and a first transfer reflective surface 113, the first surface 111 and the first transfer reflective surface 113 are located on the first side S1, the first The reflective surface 112 is located on the second side S2. The second light guide module 12 has a second surface 121, a second reflective surface 122 and a second transfer reflective surface 123, the second surface 121 and the second transfer reflective surface 123 are located on the first side S1, and the second The reflective surface 122 is located on the second side S2. Although the first light guide module 11 and the second light guide module 12 in Fig. 1 and Fig. 2A have the same shape as an example, the present invention is not limited thereto. The guide modules 12 may have the same or different shapes, and their sizes and curvatures may also be the same or different, and they are not necessarily adjacent to each other, which will be further illustrated in the second and third embodiments. Wherein, the first light guide module 11 and the second light guide module 12 can be connected or not connected, and in addition, the first light guide module 11 and the second light guide module 12 are arranged side by side and are substantially parallel to each other, and The solar concentrator 1 is made into a plate, and the direction in which the first light guiding module 11 and the second light guiding module 12 are arranged side by side is substantially parallel to the main direction D1 where the light L is guided. In addition, the materials of the first light guide module 11 and the second light guide module 12 may include light-transmitting materials, such as glass, acrylic (PMMA), polyethylene terephthalate (PET), polyester Carbonate (PC) or other light-transmitting polymer materials.

The following will describe in detail the light path through which the light is guided and focused by the solar collector 1 after it enters the solar collector 1 . In this embodiment, the first light guide module 11 and the second light guide module 12 are determined by the order in which the light travels. In other words, as shown in FIG. 1 , the order of the light guide modules through which the light passes is the light guide module 11 and the light guide module 12, so the light guide module 11 can be regarded as the first light guide module, and the light guide module Module 12 may be considered as a second light guiding module.

Please refer to FIG. 1 and FIG. 2A at the same time. Here, light L (parallel arrows in FIG. 1 ) enters the solar concentrator 1 through the first surface 111 of the first light guide module 11, and passes through the first reflective surface. 112 and directional transmission in the first light guide module 11, and then reflected by the first transfer reflective surface 113 to the second light guide module 12, such as but not limited to the reflection shown in Figure 1 or Figure 2A to the second reflective surface 122 of the second light guide module 12 . In addition, the light L in this embodiment can be collimated after being reflected by the first transfer reflective surface 113 to form a parallel light that goes to the second reflective surface 122, and the parallel light and the light L pass through the first The direction behind the surface 111 or the second surface 121 is substantially parallel. In terms of optics, the light before the light is reflected or refracted by the optical surface can be extended and converged into a focal point, which is called the object point, and the extended and converged focal point after being reflected or refracted by the optical surface is called the image point. Wherein, the image point (image point) of the second surface 121 and the image point (coincident) of the first transfer reflection surface 113 of the adjacent first light guide module 11 are substantially coincident (coincident). The two surfaces 121 form parallel light, which is converged and imaged at infinity; and the light L incident on the first transfer reflection surface 113 is reflected, which also forms parallel light, and is also converged and formed at infinity, so the imaging points of the two are substantially the same .

In this embodiment, the solar concentrator 1 can also include another first light guide module 11a, one end of the first light guide module 11 is connected to the first light guide module 11a, and the other end is connected to the second light guide module 11a. The guide module 12 is connected. Wherein, the first light guiding module 11a may have the same shape as the first light guiding module 11 or a different shape, so as to facilitate the manufacture and design of the whole solar concentrator 1 or increase the incident surface area of the light L. Here, the edge of the first light guide module 11a disposed on the side is blunted to remove the sharp-angled part, so that it is easier to take or assemble. And the image point of the first surface 111 is substantially co-pointed with the image point of the first transfer reflective surface 113a of the first light guide module 11a (the light L is incident on the first surface 111 and forms parallel light, forming an image at infinity; The light L is incident on the first transfer reflection surface 113a and reflected, also forms parallel light, and forms an image at infinity, so the imaging points of the two are substantially the same). In addition, except that the image point of the first surface 111 is the same as the image point of the first transfer reflection surface 113a of the first light guide module 11a, the first light guide module 11a and the first transfer reflection surface 113a The image point of the first reflective surface 112 is the same as the object point of the first reflective surface 112, and the image point of the first reflective surface 112 in the first light guide module 11 is the object point of the first transfer reflective surface 113. The imaging position after being reflected by the reflecting surface 113 falls at infinity, which is as described in the preceding paragraph.

In addition to the first light guide module 11, 11a and the second light guide module 12, as shown in Figure 1 and Figure 2A, the solar concentrator 1 can also include a housing module 13, the housing module 13 is the light L The target to be finally guided can be arranged adjacent to the second light guide module 12. The accommodating module 13 has a surface 131, a reflective surface 132, and an accommodating portion 133. Similarly, the image points on the surface 131 The image point of the second transfer reflection surface 123 is substantially co-pointed. The shape of the accommodating module 13 can be the same as or different from that of the first light guiding module 11 or the second light guiding module 12, here the shape of the accommodating module 13 is similar to that of the second light guiding module 12, but the sides Take passivation as an example. The accommodating portion 133 is located at the place where the reflective surface 132 of the accommodating module 13 reflects and converges the light. In other words, after the light L is incident on the surface of the first light guide module 11, 11a and the second light guide module 12, it will be successively transmitted to the accommodating part 133 in the accommodating module 13 along the main direction D1 where the light is guided, The accommodating part 133 can be used for accommodating a photoelectric conversion component or a heat transfer medium, such as a solar cell or a heat pipe. Here, take the accommodating portion 133 located on the first side S1 of the solar concentrator 1 as an example, and the accommodating portion 133 is elongated for accommodating a elongated solar battery M. As shown in FIG. In other implementations, there may be multiple optical mirrors inside the accommodating module 13, so the accommodating portion 133 may be located on the second side S2 of the solar concentrator 1, or between the first side S1 and the second side S2 , and the accommodating portion 133 can be in other shapes.

Please refer to FIG. 2A , by setting a plurality of first light guide modules 11 and second light guide modules 12, the incident light L can be transmitted from one side of the solar concentrator 1 to the solar concentrator 1 successively. The other side finally converges to the accommodating part 133 in the accommodating module 13 .

In addition, it should be emphasized that the first surface 111 and the second surface 121 in this embodiment take a plane as an example, and the first reflective surface 112 and the second reflective surface 122 take a concave surface as an example. The reflective surface 113 and the second transfer reflective surface 123 take a convex surface (convex) as an example, but the present invention is not limited thereto, and the above-mentioned surfaces can also have different variations. Wherein, the junctions of the surfaces 111, 121, 131 and the transfer reflective surfaces 113a, 113, 123 can form continuous or discontinuous surfaces, which can be integrally formed or combined in practical applications. For example, the first surface 111 and the second surface 121 become a convex surface, a concave surface, or a wedge (wedge) surface through the arrangement of optical components, or their own shape design; the first reflective surface 112 and/or the second reflective surface 122 , the first transfer reflective surface 113 and/or the second transfer reflective surface 123 can be any aspherical surface (such as a paraboloid, a lenticular surface, or a hyperboloid), or a free optical curved surface, respectively.

However, no matter what kind of surface the first transfer reflective surface 113, the second reflective surface 122, and the second surface 121 are, as long as the design makes the image point of the second surface 121 and the point image of the first transfer reflective surface 113 substantially The same point is enough, so in practical application, the corresponding type of surface can be selected according to various optical design requirements. According to the same principle, it can be deduced that when the solar concentrator 1 has multiple first light guiding modules 11 or second light guiding modules 12, taking this embodiment as an example with two first light guiding modules 11, 11a No matter what kind of surface the first transfer reflective surface 113a, the first reflective surface 112, and the first surface 111 are, as long as the image point on one of the surfaces is designed to be the same as the image point on the transfer reflective surface of the previous light guide module It is sufficient to have a substantially common point. Further, if the image point on the surface is to be co-pointed with the image point on the transfer reflective surface of the previous light guide module, the above-mentioned optical surface z can conform to and be described as the following formula, wherein r is the lateral direction Distance, a ₀ , a ₁ , a ₂ ... a _n are aspheric coefficients:

z=a ₀ +a ₁ r+a ₂ r ² +a ₃ r ³ +a ₄ r ⁴ +a ₅ r ⁵ +.....

Also, the aspheric coefficient a ₂ can be estimated by the following formula, where R is the radius of curvature of the paraxial region of the optical surface.

$\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

In addition, according to the Gaussian equation, in the case of the above-mentioned image points being co-pointed, 1/p+1/q=1/f, and R=2f, where R is the radius of curvature of the paraxial region of the optical surface, and f is the optical path generated The focal length of the reflected optical surface, p is the object distance of the optical surface, and q is the image distance of the optical surface.

In addition, in actual design, because light cannot enter the solar concentrator 1 from the first transfer reflective surface 113 and the second transfer reflective surface 123, the first transfer reflective surface 113 and the second transfer reflective surface 123 The area design should not be too large in order to increase the incident surface area.

Furthermore, the first surface 111, the second surface 121, the first reflective surface 112, the second reflective surface 122, the first transfer reflective surface 113, and the second transfer reflective surface 123 can be general curved surfaces in the figure, or It is a Fresnel surface or a diffraction surface to achieve a thinner volume. In one embodiment, the matching design of the refractive index of the material and the angle of the incident light L on each surface can also be used to make the above-mentioned surface a total internal reflection surface, or to coat the above-mentioned surface with a high-reflectivity coating (such as gold plating, silver, aluminum, copper, etc.) to make it an optically highly reflective surface to enhance the guiding effect of light L in the solar concentrator 1 .

Please refer to FIGS. 3A and 3B , which are top views of a solar concentrator according to another embodiment of the second embodiment of the present invention.

The solar concentrators 2a, 2b have substantially the same structure as the solar concentrator 1 of the first embodiment, the difference is that the solar concentrator 1 in the first embodiment gathers light to one side thereof, and The solar concentrators 2a, 2b in this embodiment gather light to the center thereof. The accommodating portion 233 of the solar concentrator 2a, 2b is arranged at the center of the solar concentrator 2a, 2b, and in FIG. 3A and FIG. A light guide module 21a, a second light guide module 22a, and an accommodating module 23a arranged in the middle are taken as examples, so there are two main guiding directions D2 and D3 of light rays in opposite directions, and they point to the accommodating module 23a at the same time , The accommodating portion 233 of 23b. In FIG. 3A, the shapes of the accommodating module 23a, the first light guiding module 21a and the second light guiding module 22a are all linear, and they are arranged substantially parallel to each other, while the capacity of the solar concentrator 2b in FIG. The placement module 23b, the first light guiding module 21b and the second light guiding module 22b are curved in shape and are also substantially parallel to each other.

In addition, please refer to FIG. 4 , which is a top view and a cross-sectional view of a solar concentrator according to a third embodiment of the present invention.

The solar concentrator 3 has a structure similar to that of the solar concentrator 1 of the first embodiment, the difference being that, in this embodiment, the first light guide module 31 and the second light guide module of the solar concentrator 3 The shape of the guide module 32 is ring-shaped, and it is arranged in a concentric circle, and the light L is mainly guided to the center of the concentric circle as shown in the direction D4, so a photoelectric conversion component or a heat transfer medium is arranged here, and Using the optical design, the accommodating portion 333 of the accommodating module 33 is located on the second side S2 of the solar concentrator 3 , of course, the accommodating portion 333 can also be disposed on the first side S1 as in the foregoing embodiments.

Please refer to FIG. 5A , which is a partial cross-sectional view of a solar concentrator according to a fourth embodiment of the present invention.

The solar concentrator 4a has a structure similar to that of the solar concentrator 1 of the first embodiment, except that the first surface 411a and the second surface 421a in this embodiment are convex, and the first transfer reflection The surface 413 and the second transfer reflection surface 423 are concave surfaces, and the curvatures of the first reflection surface 412 and the second reflection surface 422 can also be different. It should be noted that the definition of concave or convex depends on the side on which light is incident on the surface. But the same is that the image point of the second surface 421a is still substantially co-pointed with the image point of the first transfer reflective surface 413, that is, the image point P ₀ of the light ray L incident on the second surface 421a is the same as the ray L The image point P0 reflected by the first transfer reflective surface ₄₁₃ is the same.

Please refer to the partial enlarged view of the circular part in Figure 5A. It should be noted here that the "substantial common point" mentioned in the specification includes the actual light guiding process, which may be affected by the design and assembly of optical components. Or a slight error in manufacturing, resulting in a distance d between the image point P _{1 after the light L is reflected by the first transfer reflective surface 413 and the image point P 2 after} the light L enters the second surface 421a, not completely common point. However, it has been shown from experiments that as long as the image point P1 and the image point _P2 are close to _a certain degree, that is, within _a certain error range, the distance d between the image point _P1 and the image point P2 will not affect the light intensity. guide, and can be defined as co-points. Wherein, the distance d within the allowable error range needs to satisfy the following formula, wherein L ₁ is the light travel distance from the focused image point P ₁ to the first transfer reflective surface 413 of the optical surface, and L ₂ is the focused image point P ₂ Distance traveled by light rays from the second surface 421a of the optical surface:

$<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; |</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; |</span>$

In addition, please refer to FIG. 5A and FIG. 5B at the same time, wherein FIG. 5B is a partial cross-sectional view of another implementation of the solar concentrator according to the fourth embodiment of the present invention.

The first light guide module 41a and the second light guide module 42a of the solar concentrator 4a shown in FIG. 5A have a guide body MB, and the first side S1 and the second side S2 are located on opposite sides of the guide body MB. Therefore, after the light L is incident on the first surface 411a and the second surface 421a, it is guided and transmitted in the guide body MB. The guide body MB can be made of light transparent materials, such as glass, acrylic (PMMA), Polyethylene terephthalate (PET) or polycarbonate (PC), etc. Compared with FIG. 5A, the solar concentrator 4b shown in FIG. 5B has approximately the same optical surface structure as the embodiment shown in FIG. 5A, the difference between the two is that the solar concentrator 4b also includes a first A lens M1 and a second lens M2, the first lens M1 includes a first side S1, a first surface 411b and a second surface 421b and a first conversion reflection surface 413 and a second conversion reflection surface 423, the second lens M2 It includes the second side S2 and the first reflective surface 412 and the second reflective surface 422 . That is to say, the transmission medium in the first light guide module 41b and the second light guide module 42b is air, and the first light guide module 41b and the second light guide module 42b are composed of the first lens M1 and the second light guide module. The lens M2 is composed, therefore, after the light L is incident on the first surface 411b and the second surface 421b, it is guided and transmitted in the air between the first lens M1 and the second lens M2, and the materials of the first lens M1 and the second lens M2 can be The light-transmitting material is, for example, glass, acrylic, polyethylene terephthalate or polycarbonate. Of course, the aforementioned light guide modules in the first embodiment to the third embodiment can also be composed of two separate components, so that the transmission medium between adjacent light guide modules is air.

It is worth mentioning that the solar concentrator 4a and the solar concentrator 4b have the same first transfer reflective surface 413 and second transfer reflective surface 423 and the first reflective surface 412 and second reflective surface 422, and the different Yes, the first surface 411b and the second surface 421b of the solar concentrator 4b are changed from a convex surface to a concave surface, and the image point P ₀ of the second surface 421b of the solar concentrator 4b and the first rotation of the solar concentrator 4b The image point P ₀ connected to the reflective surface 413 is the same point, and then the light L has the same image point P ₀ as in FIG. 5A after passing through the second surface 421b.

In addition, please refer to FIG. 5C , which is a partial cross-sectional view of another implementation of the solar concentrator according to the fourth embodiment of the present invention.

Compared with FIG. 5B, the solar concentrator 4c shown in FIG. 5C has substantially the same structure as that of the embodiment shown in FIG. A third lens M3 and a fourth lens M4 on M1. Wherein, the third lens M3 and the fourth lens M4 are respectively arranged on the first surface 411c and the second surface 421c, so as to collect the light rays incident on the first surface 411c and the second surface 421c respectively, and then pass through the first surface 411c and the second surface 421c are incident into the solar concentrator 4c. In this way, the utilization rate of the incident light can also be improved, so that the light collecting effect of the solar concentrator 4 c is better. Wherein, the third lens M3 and the fourth lens M4 can be, for example, respectively a convex lens, and their shapes can also be the same or different, which is not limited here.

Please refer to FIG. 6A , which is a partial cross-sectional view of a solar concentrator according to a fifth embodiment of the present invention.

The solar concentrator 5a has a structure similar to that of the embodiment shown in FIG. 5A, the difference is that the solar concentrator 5a in this embodiment also includes at least one light converging component 55a, which is arranged on the first light guide module 51 and the first side S1 of the second light guide module 52 , the light L is respectively collected to the first surface and the second surface 511 a , 521 a through the light converging component 55 a, that is to say, the light converging component 55 a has multiple focal points. The purpose of setting the light converging component 55a is to increase the incident amount of the light L, avoiding the reduction of the incident light due to the first transfer reflective surface 513 and the second transfer reflective surface 523 occupying the area of the first side S1, thereby improving the Light utilization. Wherein, the first surface 511a and the second surface 521a are a concave surface, which diverges the light converged by the light converging component 55a, so as to maintain the image point energy of the second surface 521a substantially equal to the image point of the first transfer reflective surface 513. co-point, and its image point is located at infinity.

The light converging component 55a may be, for example but not limited to, parabolic reflectors, cubic reflectors, hyperbolic reflectors, elliptical reflectors, flat reflectors, Cassegrain Cassegrain optics, Winston Cone optics, round reflectors, lenses, holograms, or prismatic ridges, etc. In FIG. 6A , the combination of two partial lenses (partiallens) is used as an example to form the light converging component 55a, which is not intended to limit the present invention.

In addition, please refer to FIG. 6A and FIG. 6B at the same time, wherein FIG. 6B is a partial cross-sectional view of another implementation of the solar concentrator according to the fifth embodiment of the present invention.

Like the principle of the fourth embodiment, the difference between Fig. 6A and Fig. 6B is that the solar concentrator 5a shown in Fig. 6A has a guiding body MBa, and the light L is guided after being incident on the first surface 511a and the second surface 521a. Guide transmission in the main body MBa; the solar concentrator 5b shown in Figure 6B includes a first lens M1a and a second lens M2a that are oppositely arranged, and the light L is incident on the first surface 511b and the second surface 521b and passes through the first lens The transmission is guided in the air between M1a and the second lens M2a. The difference is that the first surface 511b and the second surface 521b of the solar concentrator 5b are changed from a concave surface to a convex surface, but the image point of the second surface 521b of the solar concentrator 5b is the same as the image point of the first transfer reflective surface 513 , is still substantially common. Wherein, the light converging component 55b in FIG. 6B is made by bonding two partial lenses.

Finally, please refer to FIG. 6C , which is a partial cross-sectional view of another solar concentrator according to the fifth embodiment of the present invention.

The solar concentrator 5c has a structure similar to that of the embodiment shown in FIG. 6A, the difference is that the light concentrating component 55c of the solar concentrator 5c in this embodiment is arranged on the first light guide module 51 and the second light guide module 51. On the first side S1 of the guide module 52, and the shapes and sizes of the first light guide module 51 and the second light guide module 52 along the main direction of light transmission are different, here the second light guide module 52 is slightly larger than the first light guide module 51 as an example. In addition, the first surface 511c and the second surface 521c are respectively a concave surface, and the first side S1 of the first side S1 has its corresponding light converging component 55c. The image point of the second surface 521c can substantially coincide with the image point of the first transfer reflective surface 513, so the first surface 511c and the second surface 521c are not limited to concave surfaces, and the image point is located at point P ₀ . In addition, the accommodating portion 533 is disposed on the second side S2, and after the light L is incident on the surfaces of the first light guide module 51, 51a and the second light guide module 52, it is successively transmitted to the main direction D1 along which the light is guided. The accommodating portion 533 is for example received by the solar battery M in the accommodating portion 533 . Here, in FIG. 6C , the combination of four lenses with free-form surfaces is integrally molded to form the light converging component 55 c as an example, and its shape may be as shown in FIG. 6C , but it is not intended to limit the present invention. In addition, in other implementations, the solar concentrator 55c may also have multiple light concentrating components 55c, which are stacked on the first side of the first light guide module 51 and the second light guide module 52 on S1. In addition, after the light L is refracted by the light converging component 55c and the surface 531c, the extended light converging point is located in the accommodating portion 533, and after the light is reflected by the second transfer reflection surface 523, the extended light converging The position of the point is also within the accommodating portion 533 , and both are substantially at the same point.

To sum up, the solar concentrator of the present invention achieves the effect of guiding light by forming multiple light guide modules through multiple surfaces, reflective surfaces and transfer reflective surfaces, and through the image points on the surface of the solar concentrator The substantially co-point with the image point of the transfer reflective surface of the previous light guide module enables the incident light to be accurately and gathered to a focal point in addition to being guided. Compared with the known ones, the solar concentrator of the present invention reduces the axial traveling distance needed to focus the light, thereby reducing the thickness of the whole solar concentrator, thereby achieving the goal of thinning. In this way, not only the material cost of the solar concentrator is greatly reduced, but also the utilization rate of sunlight can be improved, and the solar energy conversion device with the solar concentrator of the present invention can be conveniently used under various installation conditions, or under various conditions. application in limited space. Of course, in addition to collecting sunlight, the light collector of the present invention can also collect light emitted by other light sources.

The above description is only illustrative, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included within the scope defined in the claims.

Claims (13)

1. a planar solar concentrator, have one first relative side and one second side, it is characterized in that, described planar solar concentrator comprises:

One first smooth guiding module, has a first surface, one first reflecting surface and one first switching reflecting surface, and described first surface and described first switching reflecting surface are positioned at described first side, and described first reflecting surface is positioned at described second side; And

One second smooth guiding module, has a second surface, one second reflecting surface and one second switching reflecting surface, and described second surface and described second switching reflecting surface are positioned at described first side, and described second reflecting surface is positioned at described second side,

Wherein after the described first surface incidence of light by described first smooth guiding module, to transmit in described first smooth guiding module through described first reflective surface, again by described first switching reflective surface extremely described second smooth guiding module, described in picture point after second surface described in light and light, first transfers the picture point concurrent in fact after reflecting surface, and picture point after second surface described in light and light are d by the described first tolerable error distance of transferring between the picture point after reflective surface, picture point after second surface described in light and the distance between described second surface are L ₂, light is L by the picture point after described first switching reflective surface and the described first distance of transferring between reflecting surface ₁, wherein meet with lower inequality: $\left|d\right|<\left|\frac{L_1+L_2}{10}\right|.$

2. planar solar concentrator according to claim 1, is characterized in that, described first smooth guiding module and described second smooth guiding module are arranged side by side, or described first smooth guiding module and described second smooth guiding module are a concentric arrays.

3. planar solar concentrator according to claim 1, is characterized in that, the light through described first switching reflective surface is incident upon described second reflecting surface of described second smooth guiding module.

4. planar solar concentrator according to claim 1, is characterized in that, light forms directional light after described first switching reflective surface, and substantial parallel through the direction after described first surface or described second surface with light.

5. planar solar concentrator according to claim 1, is characterized in that, described first surface and/or described second surface are a plane, a convex surface, a concave surface or a wedge surface.

6. planar solar concentrator according to claim 1, is characterized in that, described first reflecting surface and/or described second reflecting surface and described first reflecting surface and/or described second reflecting surface of transferring of transferring is respectively aspheric surface or free optical surface.

7. planar solar concentrator according to claim 1, is characterized in that, also comprises:

One accommodating module, link with described first smooth guiding module or with described second smooth guiding module, described accommodating module has a holding part, transmits medium with an accommodating photoelectric conversion component or a heat energy.

8. planar solar concentrator according to claim 7, is characterized in that, described holding part is in described first side or described second side or between described first side and described second side.

9. planar solar concentrator according to claim 1, is characterized in that, described first smooth guiding module and described second smooth guiding module have a guiding body, and described first side and described second side are positioned at the relative both sides of described guiding body.

10. planar solar concentrator according to claim 1, is characterized in that, also comprises:

One first lens be oppositely arranged and one second lens, described first lens comprise described first side, described first surface and described second surface and described first switching reflecting surface and described second switching reflecting surface, and described second lens comprise described second side and described first reflecting surface and described second reflecting surface.

11. planar solar concentrators according to claim 1, is characterized in that, also comprise:

At least one light collection assembly, be arranged at described first side of described first smooth guiding module and described second smooth guiding module, light is through described light collection component aggregates extremely described first surface and described second surface, and the light that the adjustment of described light collection assembly is passed through, the picture point concurrent in fact of reflecting surface of transferring with the picture point and described first that maintain described second surface.

12. planar solar concentrators according to claim 1, it is characterized in that, described first surface, described second surface, described first reflecting surface, described second reflecting surface, described first switching reflecting surface and described second switching reflecting surface are curved surface, Fresnel surface or diffraction face.

13. planar solar concentrators according to claim 1, it is characterized in that, described first surface, described second surface, described first reflecting surface, described second reflecting surface, described first switching reflecting surface and described second switching reflecting surface are inner full-reflection face or optics high reverse--bias face.