KR20110007684A - Concentrated lens for concentrate photovoltaic and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A light collecting lens for solar light and a method for manufacturing the same are provided to improve the efficiency of light collection by focusing solar light in a dot form at the center part of a cell. CONSTITUTION: A mold with aspherical Fresnel lens pattern is prepared. A polycarbonate mold with the aspherical Fresnel lens pattern(200) is injection-molded using the mold with the aspherical Fresnel lens pattern and the mixture of polycarbonate and ethylene glycol. A liquid silicon composition is injected to the upper side of the polycarbonate mold with the aspherical Fresnel lens pattern. Flat tempered glass(20) is stacked on the silicon composition. The silicon composition is hardened to obtain a light collection lens(100). The light collection lens is detached from the polycarbonate mold.

Description

CONCENTRATED LENS FOR CONCENTRATE PHOTOVOLTAIC AND MANUFACTURING METHOD THEREOF}

The present invention relates to an aspherical Fresnel lens which can be applied to a photovoltaic power generation system capable of converting light energy into electrical energy and a method of manufacturing the same. In particular, it is possible to concentrate photovoltaic (CPV) in a miniaturized cell made of artificial compounds that can produce more energy at a lower cost than a conventional silicon photovoltaic (PV) system. Aspheric Fresnel Lens (ASPHERICS FRESNEL LENS) that can drive the system relates to the manufacturing process for reducing cost, cost and efficiency.

The photovoltaic industry is the fastest growing field in the 21st century. Photovoltaic is the source of life on earth and is actively developed and used as the most abundant and cleanest energy source as long as humanity exists. Such solar power generation not only solves the depleted energy problem, but also the solar energy collector which is economical as a green energy that does not cause any global warming problems such as carbon dioxide generation by fossil fuel combustion.

There are two main areas where solar energy is collected and used. The solar field is to use heating or hot water in homes, businesses, government offices, etc. Another is the photovoltaic field using photoelectric effects. Currently, research and use of the solar power generation field applying the solar cell-related technology, which will be spotlighted as a new growth engine energy source in the future, is being actively conducted.

Aspherical Fresnel lens applied to CPV has a function of condensing sunlight, and has been used as a light emitting device and an image plastic lens until now, and the shape of the lens has the shape of a convex lens or a thick lens.

In addition, a solar system composed of silicon semiconductors is a system that generates electricity by receiving light directly or indirectly when solar light is incident on a solar cell. Therefore, the manufacturing process is not only difficult, but the manufacturing cost is high and the efficiency is not high. . In order to solve this problem, there is a need for a thin and light lens that condenses 100% of light at one point of the cell through the optical design.

An object of the present invention is to provide a condensing lens having an aspherical Fresnel pattern used for solar condensing.

Specifically, the present invention uses a polycarbonate mold that is easy to form an aspherical pattern, has less deformation and damage than a metal mold even when used for a long time, and is excellent in releasability with silicon so that a fine aspherical pattern can be maintained as it is. It is intended to provide a method of manufacturing an aspherical Fresnel lens.

The present invention relates to a light collecting lens and a method for manufacturing the same, and to a method for manufacturing an aspherical Fresnel lens used for solar light collection.

Specifically, the present invention

a) manufacturing a mold in which an aspherical Fresnel lens pattern is formed on an alloy copper, beryllium copper, anoxic copper, or a star box rod;

b) inserting the mold into an injection machine, and injecting a mixture of polycarbonate and ethylene glycol in a weight ratio of 80 to 90:20 to 10 at a high pressure through a nozzle to inject a polycarbonate mold having an aspherical Fresnel lens pattern;

c) depositing titanium ions with a thickness of 30 to 60 nm on top of the polycarbonate mold, depositing an iridium thin film having a thickness of 0.1 to 1 μm thereon, assembling a polycarbonate mold and a jig, and hydrogenating the polycarbonate mold. Vacuum degassing by injecting a liquid silicone composition containing 10 to 20% by weight of an added bisphenol HBFA (Hydroxy Butyl Floro-acetate) type epoxy resin;

d) laminating plate-shaped tempered glass on the liquid silicone composition from which the bubbles are removed;

e) hardening the liquid silicone composition by applying pressure and heat to produce a condenser lens in which a silicon aspherical Fresnel lens and tempered glass are combined; And

f) separating the light collecting lens from the polycarbonate mold on which the iridium thin film is deposited;

It includes.

In the present invention, the aspherical Fresnel lens (ASPHERICS FRESNEL LENS) is a lens in which a plurality of cylindrical bands are formed in the shape of a staircase or a sawtooth at the center of the tetrahedron, and the inclination angles of the steps or the teeth are different from each other and the characteristics of the aspherical surface are different. Have

The present inventors have studied to avoid defects in the formation of such aspherical surface, and when the hydrogenated bisphenol HBFA (Hydroxy Butyl Fluoro-acetate) type epoxy resin is mixed with 10 to 20% by weight, the flowability is improved to the corner of the mold. As a result, it was found that the aspherical shape is perfectly formed to complete the present invention. Therefore, the aspherical lens of the present invention is characterized by a flawless liquid silicon lens and can be used in a tracking solar system having aberration of a lens that allows only an error of less than 0.01 nm in condensing light due to the change of the sun at one point. Do.

 In addition, it is preferable that the condenser lens according to the present invention be manufactured so as to be integrated with 8 × 3, 6 × 4, and 5 × 5 horizontal x vertical lines so as to have a stable structure and improve performance in the condensing system.

According to the present invention, the aspherical characteristics are used for condensing solar light. More specifically, the aspherical Fresnel lens has resistance and deformation resistance to environmental changes and external impacts through a bonding process with tempered glass. . Light passing through the tempered glass is refracted as it passes through the aspherical Fresnel lens, concentrating on a point in the center of the cell. In addition, the stepped or serrated shape of the Fresnel lens has an aspherical shape, which can remove factors that hinder light condensation such as spherical aberration, astigmatism, distortion, and the like.

As described above, a condensing lens made of a combination of tempered glass and an aspherical Fresnel lens can be expected to be twice as efficient as silicon solar light by focusing sunlight in the center of the cell as described above.

In the present invention, it is preferable to perform a thin film coating or anodizing surface treatment on the surface of the molded body of the alloy copper, beryllium copper, oxygen-free copper or star box material.

In addition, in the present invention, the thin film polycarbonate mold in which the titanium and iridium ions are deposited is preferably 0.5 to 2 mm thick.

The present invention also includes a condensing lens for solar condensing produced by the manufacturing method in the scope of the present invention, the condensing lens is 8 × 3, 6 × 4 lenses having a size of 120mm × 120mm Alternatively, in the array of 5 x 5, the artificial laser light source is used to combine, or array, within a tolerance of 1 micro.

Specifically, referring to Figure 1, the process for producing the aspherical silicon Fresnel lens of the present invention manufacturing a mold having an aspherical Fresnel lens shape (S1), manufacturing step of the polycarbonate mold (S2), adhesive force And blending and removing bubbles (S3) of hydrogenated bisphenol HBFA type epoxy resin and liquid silicone composition to improve light transmittance, strengthening glass lamination step using artificial laser light source (S4), bonding step of tempered glass and Fresnel lens And a release step S6 of the Fresnel lens and the polycarbonate mold.

Specifically, first, the diffraction pattern and the refraction pattern are designed to realize the shape of the silicon aspherical Fresnel lens using optical design software. Conventional condensing lenses generate aberrations and rectangular apertures, eliminating about 70% of aberrations and square apertures through design and verification using ray tracing and aspheric coefficients. The shape of the designed shape is stepped or serrated and has an aspherical shape. The previously designed shape is mirror-processed using alloy copper or beryllium copper, oxygen-free copper, and star box bar using dedicated equipment for shape correction for processing metal molds. At this time, it is possible to use the ultra-precision aspherical processing equipment equipped with the weather gauge on the Ø750 pre-form linked with the deep processing program.

Here, the bar means the shape of the bar. The alloy copper, beryllium copper, oxygen-free copper, star box is for producing a polycarbonate mold, the processed surface roughness shows a mirror surface similar to the mirror surface, and in the case of alloy copper, beryllium copper, oxygen-free copper, star box It has the advantage of being superior in shape and complicated shape, even if it has a difficult shape, and the mirror surface processing, and the good releasability with the mold after injection of the polycarbonate mold.

At this time, nano-deposited ions of iridium, iridium / renium and platinum having a thickness of 500 to 1000 nm by PVD (Plasma Vapor Deposition) physical deposition method on the surface of the molded body of the alloy copper, beryllium copper or oxygen-free copper, star box material, if necessary Thin film coating or anodizing surface treatment may further improve mold release and improve life.

을 기준으로 하여 한 개의 입자가 다른 입자와 충돌 없이 이동 가능한 거리의 평균값 이론을 따르는 것이 바람직하다.Thin film coating is a technique for depositing Ir, Ir / Re, Pt, etc. on the metal mold processing surface. The thin film coating can be deposited by a method such as arc ion plating, which maintains the inside of the chamber at a high vacuum by using a vacuum pump, and then deposits a substance to be deposited on the surface in the state of ionization, that is, a plasma, after adding a reaction gas. . Specifically, ions are deposited by applying a negative puls current to a target in a vacuum chamber and applying a bias to a metal mold in a vacuum chamber. At this time, the plasma is deposited by using a target such as Ir, Ir / Re, Pt to a thickness of 0.5 ~ 2㎛ on the metal mold processing surface. At this time, in the deposition of ions, the chamber atmosphere is preferably 1.0 × 10 ⁻³ Torr or less, and the chamber temperature is preferably 200 ~ 350 ° C. and 6N argon.

Based on this, it is preferable to follow the theory of the mean value of the distance that one particle can travel without colliding with another particle.

Alternatively, the surface treatment of anodization may be performed to improve the life time of the mold.

Next, a mold in which an aspherical Fresnel lens pattern of alloy copper, beryllium copper, anoxic copper, and star box material is formed is placed in an injection molding machine, and a polycarbonate mold is injected by injecting a liquid polycarbonate.

At this time, if a mixture of polycarbonate and volatile ethylene glycol is mixed at a weight ratio of 80 to 90: 20 to 10 by spraying at a high pressure through a nozzle, it may be sprayed in the form of fine powder to form a dense injection-molded product with a deep valley shape. . At this time, since the viscosity of the polycarbonate is lowered by ethylene glycol, it is filled to the deep valley part of the mold, and thus it is easy to form an aspherical pattern of the Fresnel lens. Ethylene glycol is removed by volatilization.

In the present invention, it is preferable to use polycarbonate (PC) as the material of the mold, and there is a good characteristic of release properties of silicon aspherical Fresnel lens as well as alloy copper, beryllium copper, anoxic copper, and star box. In general, the metal mold may have poor releasability with silicon, and thus, the aspherical Fresnel lens pattern may be damaged during mold release. However, the present invention may solve the problem by using a mold made of polycarbonate containing ethylene glycol. In addition, since the polycarbonate mold has a heat deformation temperature of 137 to 142 ° C., the silicone resin is cured after about 10 to 20 minutes at 120 ° C., so that the mold can be manufactured quickly. Therefore, it is preferable to use a mold made of polycarbonate. The injection molded polycarbonate mold is preferably manufactured to a thickness of 0.5 ~ 2mm, it is easy to be released by making a flexible (flexible) by manufacturing in the thickness.

In addition, in order to improve the life of the polycarbonate mold and to improve the releasability with the final lens, using an up-sputtered Unbalanced RF Magnetron Sputter 1 × 10 ^-2 ~ Titanium ions are deposited to a thickness of 30 to 60 nm with a buffer layer at 1 × 10 ^-6 torr, and an iridium thin film with a thickness of 0.1 to 1 μm is deposited as a top layer.

Several polycarbonate molds may be assembled to form one mold. That is, the productivity is improved by manufacturing a multicavity polycarbonate mold. The multicavity mold is a technology in which 8 × 3, 6 × 4, or 5 × 5 polycarbonates having a size of 120 mm × 120 mm are arrayed. According to the present invention, by using the multi-cavity mold as described above, the lens can be manufactured with improved light condensing efficiency. It is also possible to apply a release agent to the polycarbonate mold as needed.

Assembling the polycarbonate mold and the jig, and vacuum degassing by injecting a liquid silicone composition into the multi-cavity-type polycarbonate mold, wherein the jig is used to prevent the liquid silicone composition from flowing to the outer shell.

The liquid silicone composition used to prepare the Fresnel lens in the present invention is not limited, but it is also possible to use a mixture of hydrogenated bisphenol HBFA type epoxy resin, A type liquid silicone resin component and B type liquid curing agent component. Specifically, the hydrogenated bisphenol HBFA type not only improves the bonding strength with the tempered glass, but also improves the light transmittance, and the A-type liquid as the resin component has a viscosity of 50,000 to 55,000 cP, and the B liquid as the curing agent component has a viscosity. Use 20,000 to 30,000 cP. After thoroughly mixing A and B solutions, the refractive index of the light should be maintained at 1.4 to 1.5, more preferably 1.405. Vacuum is maintained using a rotary pump to remove bubbles generated during stirring. The vacuum is preferably maintained at 5 × 10 ⁻¹ torr or less.

The amount of the liquid silicone composition injected into the multicavity-type polycarbonate mold is injected into the polycarbonate in a predetermined amount 24 to 25 times by 350g of liquid silicone. In order to remove the remaining bubbles in the state in which the liquid silicone composition is injected, it is preferable to enter the vacuum chamber and remove the bubbles by the rotary pump. Laminated plate-shaped tempered glass on the liquid silicone composition is completely removed bubbles.

At this time, it is also possible to further apply a primer composition in order to improve the adhesion between the tempered glass and the silicone resin interface as needed. The primer composition may use any one or two or more selected from a (meth) acrylic resin having a carboxyl group, an acrylic resin having an alkoxysilyl group in the side chain, a polyisocyanate, and a silane coupling agent. Moreover, in order to make application easy, it can melt | dissolve in solvents, such as ethylene glycol monomethyl, and can use.

(Meth) acrylic resin which has a carboxy group is not specifically limited, For example, the homopolymer of acrylic acid or methacrylic acid, or the copolymer using these is mentioned. More specifically, methyl acrylate and the like can be used. Adhesion is further excellent when the (meth) acrylic resin having a carboxyl group is contained. This is because the carboxyl group of the (meth) acrylic resin having a carboxyl group interacts with the glass evaporation property. It is preferable that the content is 5-50 weight part with respect to 100 weight part of silicone resins.

The acrylic resin which has an alkoxy silyl group in a side chain means the acrylic resin which modified | denatured by introducing the alkoxy silyl group into the main chain which consists of acrylic resins. When an acrylic resin having an alkoxysilyl group is applied to the tempered glass surface, smoothness of the coated surface becomes good. It is preferable that it is 0.01-5 weight part with respect to 100 weight part of silicone resins, and, as for that content, it is more preferable that it is 0.02-1 mass part.

It is preferable that polyisocyanate has 3 or more functional groups of NCO. By using polyisocyanate of functional group number 3 or more, the crosslinking density after application | cure hardening to tempered glass becomes large, and adhesiveness improves more. The polyisocyanate having 3 or more functional groups is not particularly limited, but examples thereof include an adduct body and an isocyanurate body. Work may be used individually by 1 type, or may use 2 or more types together. It is preferable that the content is 5-500 weight part with respect to 100 weight part of silicone resins, It is more preferable that it is 5-100 weight part, It is most preferable that it is 5-50 weight part.

The silane coupling agent is not particularly limited, and specific examples thereof include aminosilane, vinyl silane, epoxy silane, methacryl silane, isocyanate silane, ketimine silane or a mixture thereof or a compound obtained by the reaction of these and polyisocyanate. . Since the adhesiveness between tempered glass and a silicone resin becomes favorable after application of a silane coupling agent to the surface of tempered glass, it is preferable. It is preferable that the content is 0.1-10 weight part with respect to 100 weight part of silicone resins.

In addition, in order to improve the light transmittance of tempered glass, DLC (Diamond Like Carbon) thin film of nanotube growth type is deposited on the junction of Fresnel lens after ion formation in gas atmosphere by using electron beam and auxiliary ion gun. This not only improves light transmittance, but also improves adhesion due to the improvement of specific surface area with silicone containing hydrogenated bisphenol HBFA type.

Tempered glass is uniformly seated using a Robert arm with air cylinder to minimize flatness and all tolerances within ± 10µm. In this case, when the silicon composition is heated to solidify and then laminated with tempered glass, bubbles are not generated. More preferably, when the tempered glass is directly laminated to the liquid silicone composition, the tempered glass is inclined to be gradually laminated. desirable.

Thereafter, the silicone composition is cured while the liquid silicone composition and the tempered glass are laminated. In the curing process, temperature is uniformly applied to produce liquid silicon into solid silicon, and heat treatment is performed to simultaneously solidify the silicon at the center and the outside. At the same time, the tempered glass is completely bonded to the opposite flat surface in the form of an aspherical Fresnel lens. Curing temperature is performed at 120 ℃ for 10 ~ 30 minutes. By curing in the above temperature range it is possible to suppress the generation of bubbles and can be completely bonded at the interface.

Next, the condensing lens in combination with the tempered glass and the silicon aspherical Fresnel lens is detached from the flexible polycarbonate mold, which is detachable when a tilt of about 60 to 170 degrees is given due to the releasability and flexibility of the polycarbonate mold. do. At this time, it is more preferable to use a desorption jig. Alternatively, it is preferable to apply instantaneous heat to the polycarbonate so that the mold is released at the interface with the lens due to thermal deformation of the polycarbonate. This is followed by a final visual inspection and a solar simulator process.

2 is a cross-sectional view illustrating a process of detaching the condenser lens 100 from the polycarbonate mold 200 according to the present invention. As shown in FIG. 1, the silicone composition is cured by curing a silicone composition in a state in which a liquid silicone composition and tempered glass 20 are laminated to form an aspherical Fresnel lens 10 in a polycarbonate mold having an aspherical surface. The aspherical Fresnel pattern is transferred to the silicon layer to form the aspherical Fresnel lens 10.

Figure 3 shows an example of a multi-cavity condensing lens manufactured according to the present invention shows a state in which 6 × 4 array of polycarbonate having a size of 120mm × 120mm.

The manufacturing method according to the present invention can mass-produce a condenser lens by a simple method, and it is easy to release.

The condensing lens according to the present invention is a condensing lens composed of a combination of tempered glass and aspherical Fresnel lens can be expected to more than twice the efficiency than silicon solar by focusing the sunlight in the center of the cell in the form of dots.

Hereinafter, the present invention will be described in detail with reference to the following examples. However, the present invention is not limited to the following examples.

[Example 1]

Through design and verification using ray tracing and aspheric coefficient, approximately 70% of aberration and square aperture were removed. The aberration formula is shown in FIG. 4. The aberration calculation values are shown in FIG. 5. Rectangular aperture removal is shown in FIG. 6.

As shown in FIG. 6, it was confirmed that the light gathered at one point by aberration removal as compared to the beam irradiation (a) of the existing lens.

[Example 2]

The compounding ratio of A-type DLE7645 (manufacturer: Tong Yang Silicon) and B-type DLE7645 (manufacturer: Tong Yang Silicon) was mixed with a silicone resin at a ratio of 7: 3. The vacuum below ^-1 torr was maintained. In order to improve the self-adhesiveness of the silicone resin, a hydrogenated bisphenol HBFA epoxy resin (trade name YX8034: JER) and a solvent (Ethyl Cabitol Acetate) were mixed in a 2: 1 ratio for two days to dissolve, and then the epoxy resin solution was added to the 80 weight ratio of the silicone resin. 20 weight ratios were added and the mixture was fully stirred to prepare a silicone resin composition containing an adhesive.

The liquid silicone composition was injected into the multicavity polycarbonate mold 350g 24 times. Then, the tempered glass was raised, and cured at 120 ° C. for 10 minutes to produce a light collecting lens.

The adhesion of the manufactured light collecting lens was measured and shown in FIG. 7. As shown in Figure 7, it was found that the adhesion between the silicon and the tempered glass is excellent.

In addition, the transmittance was measured and shown in FIG. It was found that the transmittance was excellent.

The adhesion and transmittance were measured by the following method.

-Adhesion: 180 ° peel test, Cross-head speed; 10 cm / min,

180 ° peel test was carried out by attaching insulating tape to the silicon sheet for performance (adhesive tester (Stable Micro System))

-Transmittance: Measure the transmittance in the 300 ~ 2500nm range using UV / Vis Spectrophotometer.

Example 3

Prepared in the same manner as in Example 1, the primer composition was applied when the tempered glass adhesion. Dow Corning DY39-067 was added to the ethylene glycol monomethyl solvent in a 10% by weight content to prepare a primer composition, then applied in the form of a spray and dried in an oven for 5 minutes.

The adhesion of the manufactured light collecting lens was measured and shown in FIG. 8. As shown in FIG. 8, it can be seen that the adhesive force is 1.5 times higher than in Example 1.

In addition, the transmittance was measured and shown in FIG. In comparison with Example 1, it was confirmed that there was no change in transmittance.

Example 4

Prepared in the same manner as in Example 1, but the curing time was 20 minutes. The adhesion of the manufactured light collecting lens was measured and shown in FIG. 9. As shown in Figure 9, as the curing time is longer it was confirmed that the adhesion between the tempered glass and the silicone resin interface without the primer treatment.

Example 5

Prepared in the same manner as in Example 1, but the curing time was 30 minutes. The adhesion of the manufactured light collecting lens was measured and shown in FIG. 10. As shown in Figure 10, as the curing time is longer it was confirmed that the adhesion between the tempered glass and the silicone resin interface without the primer treatment.

Example 6

Prepared in the same manner as in Example 1, the primer composition was applied when the tempered glass adhesion. Acrylic acid methyl ester was added to the ethylene glycol monomethyl solvent in a content of 5% by weight to prepare a primer composition, which was then applied in the form of a spray and dried in an oven for 5 minutes.

The adhesion of the manufactured light collecting lens was measured and shown in FIG. 11. As shown in FIG. 11, it was found that the adhesive strength was further improved as compared with Example 2.

1 shows a process diagram of the present invention.

Figure 2 is an example showing a cross section of the light collecting lens and the polycarbonate mold of the present invention.

3 is a photograph showing a state in which 6 × 4 polycarbonates having a size of 120 mm × 120 mm are arrayed.

Figure 4 shows the aberration calculation formula for Example 1.

5 shows aberration calculation values for Example 1. FIG.

FIG. 6 removes about 70% of aberration and rectangular aperture through design and verification using the light reverse tracking method and the aspherical coefficient for Example 1. FIG.

7 is a graph showing the adhesive force of the condenser lens according to the second embodiment.

8 is a graph showing the adhesive force of the condenser lens according to the third embodiment.

9 is a graph showing the adhesive force of the condenser lens according to the fourth embodiment.

10 is a graph showing the adhesive force of the condenser lens according to the fifth embodiment.

11 is a graph showing the adhesive force of the condenser lens according to the sixth embodiment.

12 is a graph showing the transmittance of a condenser lens according to the second embodiment.

13 is a graph showing the transmittance of a condenser lens according to the third embodiment.

Description of the main parts of the drawing-

10: Aspherical Fresnel Lens

20: tempered glass

100: condenser lens

200: polycarbonate mold

Claims (6)

a) manufacturing a mold in which an aspherical Fresnel lens pattern is formed on an alloy copper, beryllium copper, anoxic copper, or a star box rod; b) inserting the mold into an injection machine, and injecting a mixture of polycarbonate and ethylene glycol in a weight ratio of 80 to 90:20 to 10 at a high pressure through a nozzle to inject a polycarbonate mold having an aspherical Fresnel lens pattern; c) depositing titanium ions with a thickness of 30 to 60 nm on top of the polycarbonate mold, depositing an iridium thin film having a thickness of 0.1 to 1 μm thereon, assembling a polycarbonate mold and a jig, and hydrogenating the polycarbonate mold. Vacuum degassing by injecting a liquid silicone composition containing 10 to 20% by weight of an added bisphenol HBFA (Hydroxy Butyl Floro-acetate) type epoxy resin; d) laminating plate-shaped tempered glass on the liquid silicone composition from which the bubbles are removed; e) hardening the liquid silicone composition by applying pressure and heat to produce a condenser lens in which a silicon aspherical Fresnel lens and tempered glass are combined; And f) separating the light collecting lens from the polycarbonate mold on which the iridium thin film is deposited; Method of manufacturing a condensing lens for solar condensing comprising a. The method of claim 1, The aspherical surface is a step of manufacturing a condensing lens for solar condensation of the stepped or serrated. The method of claim 1, Method for producing a light collecting lens, characterized in that the surface of the alloy, beryllium copper, oxygen-free copper or star box material formed by the stabilization of the oxide layer through a thin film coating or anodization. The method of claim 1, The polycarbonate mold is a manufacturing method of a light collecting lens, characterized in that the flexible thickness of 0.5 ~ 2mm. The method of claim 1, When the tempered glass is laminated in the step d), the primer composition is applied to one surface of the tempered glass on which the DLC (Diamond Like Carbon) thin film having the improved light transmittance is formed by a plasma-enhanced chemical vapor deposition (PECVD) method. A manufacturing method of a light collecting lens characterized in that. A condenser lens for solar condensation produced by the manufacturing method of any one of claims 1 to 5.

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