TWM453964U - Secondary optical structure for a light collection device - Google Patents

Description

Secondary optical structure for concentrating device

The present invention relates to a secondary optical structure for a light collecting device; in particular, a composite structural design of a light collecting system applied to a concentrating solar module or a solar energy conversion mechanism, A new type of light that increases the acceptable angle of light and photoelectric conversion efficiency of the light collecting device.

It is a well-known technique to apply an optical lens (for example, a Fresnel lens) and a solar cell module or a combination of wafers to collect a large number of incident light collection systems or light collection modules. Conventional light collecting systems include a fixed combination of optical lenses or primary optical elements (or concentrators), secondary optical elements, and a light receiving element (or solar wafer). For example, US 6541694 B2 "NONIMAGING LIGHT CONCENTRATOR WITH UNIFORM IRRADIANCE" patent provides a typical embodiment.

A subject of structural design and application of a secondary optical element relating to the above patent is that the secondary optical element (or TIR; Total Internal Reflection) is a structure of a long-angled cylinder having a wide upper surface and a narrow lower surface (please Referring to Fig. 1); Fig. 1 shows that the underside of the secondary optical element A is bonded with a silicone S to bond the solar wafer C and the substrate B. As is known to those skilled in the art, the entire secondary optical element A has an optically active surface and is therefore relatively difficult to fabricate. Moreover, compared with the conventional secondary optical element, the secondary optical element A has a relatively high height in the longitudinal axis direction, which not only makes its volume relatively large, but also causes the component to be expensive and difficult to manufacture. The thickness of the group increases, etc.; the opposite, also makes the whole set The assembly margin of the optical system has become relatively small, and this situation is not what we expected.

Another subject related to the structure and application of the secondary optical component A is that the gelation of the silicone S bonding operation affects its optical efficiency; for example, the figure shows that some light rays L pass through the second The surface of the optical element A is refracted, and after entering the secondary optical element A to cause total reflection, the light L cannot be incident on the wafer C, thereby forming a light leakage phenomenon, thereby affecting its optical efficiency.

Typically, these references show the use and structural design of secondary optics or their associated bonding components associated with solar concentrating systems. If the re-design considers the secondary optical component and related component structure, as well as the above-mentioned application, it can change its use type differently from the conventional one under the condition of compact structure, and is different from the old method. . In essence, not only can it increase its optical acceptability angle and achieve uniformity of optical illumination; and, further considerations provide improvements to the conventional secondary optical structure, which is difficult to fabricate, large in size, small in assembly margin, and optically affected by overflow. Means of efficiency and other situations.

None of these topics have been specifically shown or disclosed in the above references.

The main purpose of the present invention is to provide a secondary optical structure for a light collecting device; the secondary optical structure comprising a first light guiding portion and a second forming a (semi)spherical or aspherical shape a light guiding portion; the second light guiding portion has a first surface connecting the first light guiding portion and a second surface combining a light receiving element. The first light guiding portion and the second light guiding portion allow light of different wavelengths to be refracted to be focused on the light receiving element; and, for those light rays having an off angle, to be optically totally reflected by the second light guiding portion Incident to the light receiving element to increase the optical acceptability angle and enhance the optical efficiency. Moreover, the conventional secondary optical structure is difficult to manufacture, the volume is large, and the assembly margin is small; and, like the conventional secondary optical element and the solar wafer, the optical efficiency is affected by the overflow of the gel, and is also as much as possible. drop to lowest.

The above acceptable angle means that the system efficiency when the solar ray is perpendicularly incident on the concentrating system is I ₀ under ideal conditions without error. However, when the external factor forces the angle of the incident light to deviate, if the efficiency of the light collecting system can reach 90% of I ₀ , the incident angle deviation is defined as an acceptable angle.

According to the secondary optical structure for a light collecting device of the present invention, the second light guiding portion is in the form of a square cone; and includes four sides connecting the first surface and the second surface; and the side The slope is greater than the slope of the secondary optical element A described above. Therefore, those rays that generate the off-angle light can be totally reflected to the light-receiving element after entering the second light guiding portion.

According to the secondary optical structure for a light collecting device of the present invention, the second light guiding portion is of a parabolic structure (or cone shape); and includes a side surface connecting the first surface and the second surface. Therefore, those rays that generate the off-angle light can be totally reflected to the light-receiving element after entering the second light guiding portion.

The novelty, characteristics, and other purposes and effects of this creation will be clarified below in conjunction with the detailed description of the drawings; as shown in the figure:

10‧‧‧One optical element

20‧‧‧Second optical structure

21‧‧‧First Light Guide

22‧‧‧Second Light Guide

23‧‧‧ first side

24‧‧‧ second side

25, 26‧‧‧ side

30‧‧‧矽胶

40‧‧‧floor

50‧‧‧Light receiving components

60‧‧‧Substrate

71~74‧‧‧ incident light

80‧‧‧Frame

100‧‧‧Optical cover

A‧‧‧Secondary optical components

B‧‧‧Substrate

C‧‧‧Solar chip

L‧‧‧Light

S‧‧‧矽胶

Χ‧‧‧reference axis

Figure 1 is a schematic plan view of a conventional secondary optical element; the figure also depicts the case where incident light passes over the light receiving element.

Fig. 2 is a schematic view showing the structure of the present invention; showing the case where the first light guiding portion forms a hemispherical structure and the second light guiding portion forms a square pyramid; the imaginary line portion in the figure represents a primary optical element.

Figure 3 is a schematic diagram of the planar structure of the present creation; the figure also depicts the movement of incident light rays through the first light guiding portion and the second light guiding portion.

Figure 4 is a schematic diagram of another planar structure of the present invention; showing the movement of the secondary optical structure when the incident light produces an off-angle.

Fig. 5 is a schematic view showing a modified embodiment of the present invention; showing a case where the first light guiding portion forms a hemispherical structure and the second light guiding portion forms a parabolic structure.

Figure 6 is a schematic diagram of one of the possible embodiments of the present invention; the primary optical element, the secondary optical structure is combined with the bottom plate and the frame to form a collection module assembly.

Figure 7 is a comparison of the size (or volume) of the actual product of the secondary optical structure of the present invention and the conventional secondary optical component.

Referring to Figures 2 and 3, the secondary optical structure for the light collecting device of the present invention includes a combination of a primary optical element (or a focusing optical element) and a secondary optical structure, respectively, with reference numerals 10 and 20, respectively. Express it. In the embodiment taken, the primary optical element 10 is selected Fresnel or a similar lens concentrating system as an illustrative embodiment. In one possible embodiment, the secondary optical structure 20 is disposed at a focal position of the primary optical component 10. The focusing optical element 10, after receiving at least a portion of the light of the light source, causes the light to exit out to the secondary optical structure 20; and, through the refraction of the secondary optical structure 20, the light is incident on a light receiving element 50. (or solar wafer).

Referring to Figures 2 and 3, in the embodiment taken, the secondary optical structure 20 is formed with a geometrically contoured light-transmissive solid body based on a (longitudinal) reference axis. The secondary optical structure 20 is shown to include a first light guiding portion 21 and a second light guiding portion 22 which form a convex (curved) surface pattern. The second light guiding portion 22 is in the form of a square cone, and includes a first surface 23 connected to the bottom of the first light guiding portion 21; a second surface 24 combining the light receiving elements 50; Four side faces 25 connect the first face 23 and the second face 24.

In the embodiment taken, the first light guiding portion 21 forms a (semi) spherical or spherical surface. The structure type; the first light guiding portion 21 can also form an aspherical structure.

The area of the first surface 23 is also larger than the area of the bottom of the first light guiding portion 21; the area of the first surface 23 is also larger than the area of the second surface 24. The first light guiding portion 21 and the second light guiding portion 22 allow light of different wavelengths to be refracted and/or reflected to be focused on the light receiving element 50; and the light that produces the off angle can pass through the second The optical total reflection of the light guiding portion 22 is incident on the light receiving element 50. This section will be described later.

In the embodiment, the second surface 24 of the second light guiding portion 22 bonds the light receiving member 50 and a substrate 60 with the silicone 30. The substrate 60 is a plate-like body made of ceramic, copper or the like; for example, the case depicted in FIG. In a possible embodiment, the second light guiding portion 22 can be directly coated or encapsulated on the light receiving element 50. Figure 2 also shows that the light receiving element 50 is a geometrically contoured structure (e.g., a square or circular outline) that combines the shape of the second light directing portion 22 and the substrate 60.

Figure 3 specifically depicts the optical effect of incident light or solar light entering the primary optical element 10 and secondary optical structure 20 in a direct pattern, while collecting light travels. In the embodiment taken, the incident light rays passing through the intermediate portion of the primary optical element 10 are indicated by reference numeral 71; the incident light rays passing through the peripheral portion of the primary optical element 10 are indicated by reference numeral 72.

The figure shows that light rays 71 pass through the primary optical element 10 directly through the first light guiding portion 21 of the secondary optical structure 20, enter the second light guiding portion 22, and are incident on the light receiving element 50. The incident light beam 72 is guided by the primary optical element 10, refracted by the first light guiding portion 21 of the secondary optical structure 20, and enters the second light guiding portion 22 in the forward direction; and then incident on the light receiving element 50. That is, incident light of different wavelengths passes through the primary optical element 10 and the first light guiding portion 21 and the second light guiding portion 22 of the secondary optical structure 20. Optical action can be focused on the light receiving element 50.

Referring to FIG. 4, assuming that the solar ray or the incident ray produces an off-angle, most of the incident ray 73 is guided by the primary optical element 10 and passes through the refractive optical action of the first light guiding portion 21 of the secondary optical structure 20. And entering the second light guiding portion 22 to be incident on the light receiving element 50.

Figure 4 also shows a portion of incident light 74 that passes through the primary optical element 10 and passes through the first side 23 of the second light guiding portion 22 into the second light guiding portion 22; The total reflection optical action of the side portion 25 of the light portion is incident on the light receiving element 50. That is, the second light guiding portion 22 (or the first surface 23) provides that the incident light ray 74 that generates the yaw angle can be incident on the light receiving element 50 by the optical total reflection of the second light guiding portion 22, thereby increasing The role of optically acceptable angles and improved optical efficiency.

It should be noted that the slope of the side surface 25 of the second light guiding portion is greater than the slope of the secondary optical element A (ie, the TIR optical element); and the second light guiding portion 22 is disposed on the reference axis The length is significantly smaller than the length of the secondary optical element A described above. Therefore, the incident light rays 74 that generate the off-angles are totally reflected to the light-receiving element 50 after entering the second light guiding portion 22.

Referring to FIG. 5, a modified embodiment of the secondary optical structure 20 is depicted; the second light guiding portion is shown to form a parabolic structure (or cone) based on the reference axis. The light solid body shape includes a side surface 26 connecting the first surface 23 and the second surface 24. Therefore, the incident light rays which generate the off angles are totally reflected to the light receiving element 50 after entering the second light guiding portion 22.

Referring to FIG. 6, an embodiment in which the primary optical element 10 and the secondary optical structure 20 are combined with a bottom plate and a frame to form a light collecting system or a light collecting module assembly is described. The figure shows A plurality of primary optical elements 10 are formed in a matrix arrangement to form a structure of an optical cover 100; corresponding to each primary optical element 10, a secondary optical structure 20 is disposed; and a bottom plate 40 and a frame 80 are combined The optical cover 100 and the secondary optical structure 20 are fixed to complete the light collecting module assembly.

Typically, the secondary optical structure used in the concentrating device has the following considerations and advantages compared to the old method in that it has a structurally compact condition:

1. The secondary optical structure 20 and related component structures have been redesigned; for example, the first light guiding portion 21 combines the second light guiding portion 22, and the area of the first light guiding portion first surface 23 a structure that is larger than the area of the first light guiding portion 21, and the incident light of different wavelengths is optically refracted by the first light guiding portion 21 and the second light guiding portion 22, and is focused on the light receiving element 50. The combined type and optical motion path, etc., are significantly different from the structural design and optical motion of the prior art (for example, the secondary optical element A is totally reflective optics); and, its use type is changed, and Different from the old law.

2. The second light guiding portion 22 (or the first surface 23) provides an optical total reflection of the yaw angle that can be incident on the light receiving element 50 via the optical total reflection of the second light guiding portion 22, It increases the optical acceptability angle and enhances the optical efficiency.

3. The first light guiding portion 21 forming the hemispherical or aspherical structure, and the structural structure of the second light guiding portion 22 of the combined pyramid type, the structure of the conventional secondary optical element A is significantly improved (all The reflective optical surface is not easy to fabricate and has a large volume, which makes the assembly margin of the entire light collecting system relatively small. For example, Figure 7 particularly shows a comparison of the size (or volume) of the actual product of the secondary optical structure 20 and the conventional secondary optical element A. The height of the secondary optical structure 20 is about 1 cm; The height of the secondary optical element A is about 3.5 cm. In contrast, the secondary optical structure 20 produces a more pronounced difference than the volume of the conventional secondary optical element A. Moreover, the overflow phenomenon of the bonding operation of the secondary optical component A and the silicone adhesive S in the old method, which affects its optical efficiency, is also minimized as much as possible.

Therefore, this creation provides an effective secondary optical structure for the light collecting device, and its spatial type is different from the conventional one, and has the advantages unmatched in the old method, showing considerable progress. Cheng has fully met the requirements of the new patent.

However, the above is only a feasible embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the equivalent changes and modifications made by the scope of the patent application of the present invention are covered by the scope of the creative patent. .

10‧‧‧One optical element

20‧‧‧Second optical structure

21‧‧‧First Light Guide

22‧‧‧Second Light Guide

23‧‧‧ first side

24‧‧‧ second side

25‧‧‧ side

30‧‧‧矽胶

50‧‧‧Light receiving components

60‧‧‧Substrate

Claims (18)

A secondary optical structure for a light collecting device; the secondary optical structure is formed by a reference axis (χ) to form a geometrically shaped transparent solid body, comprising: a first light guiding portion Forming a convex shape; a second light guiding portion having a first surface, a second surface, and at least one side connecting the first and second sides; the first surface connecting the first light guiding portion a bottom portion; the first surface has an area larger than an area of the bottom of the first light guiding portion; and the first light guiding portion refracts a light and smoothly exits to the bottom of the first light guiding portion and the second light guiding portion The second side of the department. A secondary optical structure for a light collecting device according to claim 1, wherein the secondary optical structure is combined with a focusing optical element (or primary optical element). A secondary optical structure for a light collecting device according to claim 2, wherein the secondary optical structure is disposed at a focal position of the focusing optical element. The secondary optical structure for a light collecting device according to the first aspect of the invention, wherein the second light guiding portion of the secondary optical structure is a square cone shape, comprising four sides, connecting the The first side and the second side. The secondary optical structure for a light collecting device according to claim 1, wherein the area of the first surface is larger than the area of the second surface. The secondary optical structure for a light collecting device according to the first aspect of the invention, wherein the second surface of the second light guiding portion is provided with a silicone rubber, and the light receiving component and the substrate are bonded to the geometric contour. . a secondary optical structure for a light collecting device according to claim 6, wherein the base The plate is a plate-like body made of one of ceramic and copper. The secondary optical structure for a light collecting device according to claim 1, wherein the second light guiding portion directly encapsulates a light receiving member that is geometrically contoured. A secondary optical structure for a light collecting device according to claim 6 or 8, wherein the light receiving element is a square-profile structure. A secondary optical structure for a light collecting device according to claim 6 or 8, wherein the light receiving element is a circularly contoured structure. The secondary optical structure for a light collecting device according to claim 1, wherein a slope of a side of the second light guiding portion is greater than a slope of a TIR optical element. The secondary optical structure for a light collecting device according to claim 1, wherein the length of the second light guiding portion on the reference axis (χ) is smaller than the length of a TIR optical element. The secondary optical structure for a light collecting device according to claim 1, wherein the secondary optical structure forms a parabolic structure. The secondary optical structure for a light collecting device according to claim 1, wherein the secondary optical structure forms a cone shape. The secondary optical structure for a light collecting device according to claim 2, wherein a plurality of primary optical elements form a matrix arrangement type to form an optical cover structure; corresponding to each primary optical element, A secondary optical structure is disposed; and a bottom plate and a frame are combined to fix the optical cover and the secondary optical structure to complete an optical module assembly. The secondary optical structure for a light collecting device according to claim 1, wherein the first light guiding portion is a spherical (convex) surface structure. The secondary optical structure for a light collecting device according to claim 1, wherein the first light guiding portion is an aspherical (convex) surface structure. The secondary optical structure for a light collecting device according to claim 1, wherein the second light guiding portion reflects an off-angle light to the second surface through the side surface.