Color fresnel lens structure, and manufacturing method therefor and application thereof

Abstract

A color Fresnel lens structure, and a manufacturing method therefor and an application thereof. The color Fresnel lens structure comprises a flexible body (200) and a color Fresnel lens (100) attached to the flexible body (200). Starting materials for preparing the color Fresnel lens (100) include: polymethylvinylsiloxane, polymethylhydrosiloxane, a platinum catalyst, and a nano pigment paste. The color Fresnel lens structure can achieve high light transmittance and a low refractive index.

Description

A colored Fresnel lens structure, its fabrication method and application Technical Field

[0001] This invention relates to the field of Fresnel lenses, and more particularly to a colored Fresnel lens structure, its manufacturing method, and its application. Background Technology

[0002] A Fresnel lens, also known as a 3D threaded lens, is mostly a thin sheet made of polyolefin material through injection molding, although some are made of glass. One side of the lens surface is smooth, while the other side is engraved with concentric circles of varying sizes. This texture is designed based on light interference and perturbation, as well as relative sensitivity and receiving angle requirements, making the lens very demanding.

[0003] Fresnel lenses often function as convex lenses for infrared and visible light, offering good performance at a significantly lower cost than ordinary convex lenses. They are frequently used in applications where high precision is not critical, such as slide projectors, thin-film magnifying glasses, and infrared detectors. Liquid silicone typically has a refractive index between 1.41 and 1.43, lower than traditional optical materials like PMMA, PC, and glass, but it can meet the requirements for irregularly shaped fabrications, making it particularly suitable for Fresnel lens manufacturing. Especially noteworthy is that silicone Fresnel lenses can perfectly replicate the texture of the Fresnel lens mold core without the defects caused by air bubbles. In certain applications, besides irregular shapes, colored Fresnel lenses are often required to provide specific effects such as blue light blocking and anti-glare, for example, in gaming glasses.

[0004] In existing technologies, a color film or sheet is typically added to the surface of the Fresnel lens to achieve this. However, this significantly reduces product quality, and the irregular surface structure makes the color film or sheet difficult to process, and problems can arise in bonding the two. Another method is to add pigment to the raw materials used in the Fresnel lens manufacturing process. However, adding pigment undoubtedly affects light transmittance and optical performance, as the pigment particles in the pigment can cause scattering, reducing transparency. This may be unsuitable for Fresnel lenses that require high light transmittance.

[0005] Therefore, it is necessary to provide a colored Fresnel lens with high light transmittance and low refractive index. Summary of the Invention

[0006] In view of the problems of the prior art, one object of the present invention is to provide a colored Fresnel lens with high light transmittance and low refractive index.

[0007] Another object of the present invention is to provide a method for manufacturing such a high-transmittance, low-refractive-index colored Fresnel lens.

[0008] Another object of the present invention is to provide applications for such high-transmittance, low-refractive-index colored Fresnel lenses.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0010] A colored Fresnel lens structure includes a flexible body and a colored Fresnel lens attached to the flexible body. The colored Fresnel lens is a colored liquid silicone, and the raw materials for its preparation include: polymethylvinylsiloxane, polymethylhydrosiloxane, platinum catalyst, and nano-color paste.

[0011] A preferred embodiment is that the raw materials for preparing the colored Fresnel lens include the following components in weight percentage: 80%~90% polymethylvinylsiloxane, 5%~15% polymethylhydrosiloxane, 1%~5% platinum catalyst, and 0.2%~2% nano-color paste;

[0012] Preferably, the mass ratio of polymethylvinylsiloxane to polymethylhydrosiloxane is 5:1 to 10:1.

[0013] In one specific implementation, the nano-color paste is a blue nano-color paste or a green nano-color paste;

[0014] Preferably, the composition of the nano-pigment paste is: 2%~4% nano-pigment, 65%~75% organosilicon substrate, 0.5%~2% dispersant, 0.1%~1% stabilizer, and the balance being solvent; wherein the nano-pigment is phthalocyanine blue nanoparticles or phthalocyanine green nanoparticles, and the particle size is preferably 5~25nm.

[0015] More preferably, the nano-color paste comprises, by mass percentage: 3% phthalocyanine blue nanoparticles or phthalocyanine green nanoparticles, 70% polydimethylsiloxane (PDMS), 1.5% polyether modified dispersant, 0.5% antioxidant (such as BHT), and 25% silicone oil.

[0016] In one specific implementation, the flexible body is an irregular non-planar structure, and the colored Fresnel lens is attached to one side of the flexible body.

[0017] In one specific implementation, the colored Fresnel lens is blue or green, with a light transmittance of 86% to 93% and a refractive index of 1.401 to 1.405.

[0018] On the other hand, the aforementioned method for fabricating a colored Fresnel lens structure includes the steps of core fabrication, mold fabrication, and colored Fresnel lens fabrication: wherein, the colored Fresnel lens fabrication includes:

[0019] 1) Thoroughly mix the two components of polymethylvinylsiloxane and polymethylhydrosiloxane liquid silica gel, platinum catalyst and nano pigment, and remove the gas from the mixed liquid silica gel in a vacuum machine;

[0020] 2) The liquid silicone, after the gas has been removed, is injected into the first molding die of the molding press with a core, so that one side of the liquid silicone is filled to form a texture corresponding to the core;

[0021] 3) The liquid silicone is bonded to a pre-made second molding mold, so that the other side of the liquid silicone is formed into a specific shape;

[0022] 4) Heat the first molding mold to a preset temperature range for a preset time range to achieve complete curing and molding of the liquid silicone.

[0023] 5) Finally, remove the solidified liquid silicone from the mold.

[0024] The present invention also includes a release agent component, wherein the release agent is selected from organosilicon release agents, such as polydimethylsiloxane or silicone oil; preferably, the amount of the release agent added is 0.1% to 2% of the total mass of the two components of polymethylvinylsiloxane and polymethylhydrosiloxane liquid silicone, such as 0.5%, 0.8%, 1%, etc.

[0025] In this invention, the second molding die is a non-planar irregular-shaped die.

[0026] In this invention, the preset temperature range is 110℃-125℃, and the preset time range is 3-4 minutes.

[0027] On the other hand, the aforementioned colored Fresnel lens structure or the colored Fresnel lens structure produced by the aforementioned manufacturing method is used in lens applications.

[0028] In the above-described method for manufacturing a colored Fresnel lens according to the present invention, to save time during mass production, a liquid silicone mixture containing gas can be poured into a first molding mold. The gas in the liquid silicone mixture is naturally expelled in the first molding mold, and then it is bonded to a second molding mold for curing. This manufacturing method saves some process steps, reduces costs, and saves manufacturing time.

[0029] The colored Fresnel lens provided by this invention, during the molding and fixing process, only requires a molding mold and does not need to be attached to a substrate, thus saving process steps. Furthermore, it can produce colored Fresnel lenses of various shapes as needed. In addition, during the molding and fixing process, after removing air bubbles, the colored Fresnel lens provided by this invention no longer requires a mold to apply pressure to the other side of the Fresnel lens. Simply attaching the irregularly shaped second molding mold to the other side of the Fresnel lens yields the desired irregular surface shape. The other side of the Fresnel lens with different shapes can be applied to movable Fresnel lenses on any material, such as curved lenses or other irregularly shaped light-transmitting surfaces.

[0030] In addition, the other side of the color Fresnel lens structure provided by the present invention is also a non-planar flexible body, which increases the application range of the color Fresnel lens structure of the present invention. It can be applied to various irregular light-transmitting surfaces and meet the application requirements of specific scenarios. Attached Figure Description

[0031] Figures 1-4 are schematic diagrams of the colored Fresnel lens structures of different structural forms of the present invention.

[0032] Among them: 100, colored Fresnel lens; 200, flexible body. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the Fresnel lens structure, manufacturing method, and applications of this invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0034] Please refer to Figures 1 to 4. An embodiment of the present invention provides a colored Fresnel lens structure, including a flexible body and a colored Fresnel lens 100 attached to the flexible body. The raw materials for preparing the colored Fresnel lens 100 include the following components in mass percentage: 80%~90% polymethylvinylsiloxane, 5%~15% polymethylhydrosiloxane, 1%~5% platinum catalyst, and 0.2%~2% nano-color paste. The mass ratio of polymethylvinylsiloxane to polymethylhydrosiloxane is 5:1~10:1, for example, 6:1, 7:1, 8:1, 9:1, 10:1, etc.

[0035] The nano-color paste is either a blue nano-color paste or a green nano-color paste;

[0036] The blue nano-color paste comprises: 2%~4% phthalocyanine blue nanoparticles, 65%~75% organosilicon substrate, 0.5%~2% dispersant, 0.1%~1% stabilizer, and the balance being solvent; wherein the phthalocyanine blue nanoparticles or phthalocyanine green nanoparticles preferably have a particle size of 5~25nm, such as 10nm, 15nm, 20nm, etc.

[0037] The green nano-color paste comprises: 2%–4% phthalocyanine green nanoparticles, 65%–75% organosilicon substrate, 0.5%–2% dispersant, 0.1%–1% stabilizer, and the balance being solvent; wherein the phthalocyanine green nanoparticles preferably have a particle size of 5–25 nm, such as 10 nm, 15 nm, or 20 nm. In this invention, the nano-color paste can be prepared using methods commonly used in the art.

[0038] More preferably, the nano-color paste comprises, by mass percentage: 3% phthalocyanine blue nanoparticles or phthalocyanine green nanoparticles, 70% polydimethylsiloxane (PDMS), 1.5% polyether-modified dispersant, 0.5% antioxidant (such as BHT), and 25% silicone oil. In this invention, by combining the color paste components with a two-component liquid silica gel system, particularly with a mass ratio of polymethylvinylsiloxane to polymethylhydrosiloxane of 5:1 to 10:1, a high-transmittance, low-refractive-index colored Fresnel lens is prepared. That is, the overall system composition ensures that the added color paste has almost no effect on the refractive index of the liquid silica gel.

[0039] The colored Fresnel lens is blue or green, with a light transmittance of 86% to 93%, such as 87%, 88%, 89%, 90%, 91%, 92%, 92.5%, etc., and a refractive index of 1.401 to 1.405, such as 1.401, 1.402, 1.403, 1.404, 1.405, etc.

[0040] In the above-described structure of the color Fresnel lens 100 of the present invention, the flexible body 200 is an irregular non-planar structure, and the Fresnel lens 100 is attached to one side of the flexible body 200.

[0041] As shown in Figures 1 and 3, the flexible body 200 can be attached to the shape of an arc surface. As shown in Figures 2 and 4, the flexible body 200 can be attached to the shape of an irregular triangular body, which can be applied to specific application scenarios.

[0042] The flexible body shape 200 mentioned above can be used for light-transmitting products in many application fields, such as lenses.

[0043] In addition, the manufacturing method of the present invention can refer to the prior art, such as CN112192798A and CN115657172A. Unless otherwise specified, the relevant methods of the prior art can be incorporated into the present invention.

[0044] Specifically, the present invention provides a method for manufacturing a colored Fresnel lens, comprising the steps of core fabrication, mold fabrication, and colored Fresnel lens fabrication: wherein, the colored Fresnel lens fabrication includes:

[0045] Two components of polymethylvinylsiloxane and polymethylhydrosiloxane liquid silica gel, platinum catalyst and nano pigment are thoroughly mixed, and the gas in the mixed liquid silica gel is removed in a vacuum machine.

[0046] The liquid silicone, after the gas has been removed, is injected into the first molding die with a core in the molding machine, so that one side of the liquid silicone is filled to form a texture corresponding to the core. After the gas in the mixed liquid silicone is removed in the vacuum machine, the liquid silicone naturally forms without the need for a molding machine, saving process steps.

[0047] The liquid silicone is bonded to a pre-made second molding mold, so that the other side of the liquid silicone is formed into a specific shape;

[0048] The first molding mold is heated to a preset temperature range for a preset time range to achieve complete curing and molding of the liquid silicone.

[0049] Finally, the solidified liquid silicone is demolded.

[0050] After the colored Fresnel lens of the present invention is formed, the addition of polydimethylsiloxane as a release agent increases the release speed during the release process, and the Fresnel lens after release has smooth edges without defects.

[0051] The colored Fresnel lens of the present invention described above can be formed and fixed using only a forming mold without the need for an attached substrate, saving process steps and production costs. Furthermore, Fresnel lenses of various shapes can be obtained as needed, such as the curved Fresnel lens shown in Figure 3. In addition, the Fresnel lens provided by the present invention, after removing air bubbles during the forming and fixing process, no mold is needed to apply pressure to the other side of the Fresnel lens; simply attaching the irregularly shaped second forming mold to the other side of the Fresnel lens yields the desired irregular surface shape, as shown in Figures 1 to 4. The different shaped Fresnel lenses can be applied to movable Fresnel lenses on any material, such as curved lenses or other irregularly shaped light-transmitting surfaces.

[0052] In the Fresnel lens 100 manufacturing method of the present invention described above, the second molding mold is a non-planar irregular mold, and irregular molds of different shapes can be applied to specific fields as needed.

[0053] In the Fresnel lens manufacturing method of the present invention described above, the preset temperature range is 110℃-125℃, and the preset time range is 3-4 minutes.

[0054] In this invention, the mold core making and mold making can be carried out according to the required product shape or structure. Taking mold core making as an example, it includes the following steps:

[0055] S1. Determine its optical performance indicators, such as focal length and aperture, according to the requirements;

[0056] S2. Use high-precision CNC machining equipment to perform rough machining on the mold material;

[0057] S3. Use precision machining equipment (such as wire cutting or electrical discharge machining) for precision machining, and strictly control dimensional accuracy and surface roughness;

[0058] S4. Polish the mold to improve its surface finish and conduct rigorous testing.

[0059] In this invention, by combining pigment components and a two-component liquid silica gel system, a blue Fresnel lens or a green Fresnel lens with a transmittance of 86%~93% and a refractive index of 1.401~1.405 can be prepared.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A colored Fresnel lens structure, characterized in that, The invention includes a flexible body and a colored Fresnel lens attached to the flexible body. The colored Fresnel lens is a colored liquid silicone, and the raw materials for its preparation include: polymethylvinylsiloxane, polymethylhydrosiloxane, platinum catalyst, and nano-color paste.

2. The color Fresnel lens structure as described in claim 1, characterized in that, The raw materials for preparing the colored Fresnel lens include the following components in weight percentage: 80%~90% polymethylvinylsiloxane, 5%~15% polymethylhydrosiloxane, 1%~5% platinum catalyst, and 0.2%~2% nano-color paste; Preferably, the mass ratio of polymethylvinylsiloxane to polymethylhydrosiloxane is 5:1 to 10:

1.

3. The color Fresnel lens structure as described in claim 2, characterized in that, The nano-color paste is either a blue nano-color paste or a green nano-color paste; Preferably, the composition of the nano-pigment paste, by mass percentage, is: 2%~4% nano-pigment, 65%~75% organosilicon substrate, 0.5%~2% dispersant, 0.1%~1% stabilizer, and the balance being solvent; wherein the nano-pigment is phthalocyanine blue nanoparticles or phthalocyanine green nanoparticles, and the particle size is preferably 5~25nm; More preferably, the nano-color paste comprises, by mass percentage: 3% phthalocyanine blue nanoparticles or phthalocyanine green nanoparticles, 70% polydimethylsiloxane (PDMS), 1.5% polyether modified dispersant, 0.5% antioxidant (such as BHT), and 25% silicone oil.

4. The color Fresnel lens structure as described in any one of claims 1 to 3, characterized in that, The flexible body is an irregular, non-planar structure, and the colored Fresnel lens is attached to one side of the flexible body.

5. The color Fresnel lens structure as described in claim 4, characterized in that, The colored Fresnel lens is blue or green, with a transmittance of 86% to 93% and a refractive index of 1.401 to 1.

405.

6. A method for manufacturing a colored Fresnel lens structure according to any one of claims 1 to 5, characterized in that, The process includes core fabrication, mold fabrication, and the fabrication of a colored Fresnel lens. The fabrication of the colored Fresnel lens includes: 1) Thoroughly mix the two components of polymethylvinylsiloxane and polymethylhydrosiloxane liquid silica gel, platinum catalyst and nano pigment, and remove the gas from the mixed liquid silica gel in a vacuum machine; 2) The liquid silicone, after the gas has been removed, is injected into the first molding die of the molding press with a core, so that one side of the liquid silicone is filled to form a texture corresponding to the core; 3) The liquid silicone is bonded to a pre-made second molding mold, so that the other side of the liquid silicone is formed into a specific shape; 4) Heat the first molding mold to a preset temperature range for a preset time range to achieve complete curing and molding of the liquid silicone. 5) Finally, remove the solidified liquid silicone from the mold.

7. The manufacturing method as described in claim 6, characterized in that, It also includes a release agent component, wherein the release agent is selected from silicone release agents; preferably, the amount of the release agent added is 0.1% to 2% of the total mass of the two components of polymethylvinylsiloxane and polymethylhydrosiloxane liquid silicone.

8. The manufacturing method as described in claim 6, characterized in that, The second molding die is a non-planar irregular-shaped die.

9. The manufacturing method as described in claim 6, characterized in that, The preset temperature range is 110℃-125℃, and the preset time range is 3-4 minutes.

10. The application of a colored Fresnel lens structure according to any one of claims 1 to 5 or a colored Fresnel lens structure manufactured by the manufacturing method according to any one of claims 6 to 9 in a lens.

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