Molding method for honeycomb eye-like structure film and eyeglass lenses using the film

Abstract

This invention discloses a molding method for a honeycomb-eye-like structure film and eyeglass lenses using this film. The method involves fabricating a microlens array on a hard, brittle material substrate using femtosecond laser wet etching; obtaining a structure with the microlens array through PDMS or PMMA replication technology; and then bonding the PDMS film to the lens to obtain a lens with anti-myopia effect. The rigid material mold for the microlens array, prepared using the simple steps disclosed in this invention, can mass-produce PDMS or PMMA films with a microconvex lens array structure. These PDMS or PMMA films are then fixed to the surface of eyeglasses. This method is simple to operate, highly precise, suitable for mass production, and has low cost, making it suitable for widespread application.

Description

Technical Field

[0001] This invention relates to the field of femtosecond laser micro / nano fabrication technology, and in particular to a molding method for a honeycomb-eye-like structure film and eyeglass lenses using the film. Background Technology

[0002] Femtosecond laser micro / nano fabrication, with its small heat-affected zone, nonlinear interaction with materials, and high-resolution processing exceeding the diffraction limit, enables high-quality, high-precision micro / nano fabrication and three-dimensional micro / nano structure manufacturing of various materials. Femtosecond laser processing can meet the processing requirements of high-precision three-dimensional structure fabrication, multi-material micro / nano structure processing, and device molding and integration, thus demonstrating significant technological advantages in the development of various micro / nano structured functional components. Currently, femtosecond lasers are widely used in several cutting-edge scientific fields.

[0003] In recent years, myopia has become a significant threat to visual health. The prevalence of myopia is rising sharply and showing a trend towards affecting younger people. Once myopia develops, it is irreversible, and as the degree of myopia worsens, the risk of myopia complications increases, seriously affecting visual health. It has been proven that peripheral defocusing can effectively slow the further progression of myopia. This type of anti-myopia lens has a defocused area composed of a microlens array. In this lens, light passes through different refractive areas, focusing the image onto the retina of the eye, causing the light incident on the lens to focus closer to the object than the predetermined position, thereby inhibiting the development of myopia. Therefore, it is significant to combine femtosecond laser micro-nano fabrication capabilities to efficiently and cost-effectively fabricate biomimetic compound eye anti-myopia lenses. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to provide a molding method for a honeycomb-eye structure film and eyeglass lenses using the film. The method involves fabricating a rigid material mold for a microlens array using a femtosecond laser, which can mass-produce PDMS or PMMA films with a micro-convex lens array structure. The film is then fixed onto the surface of the eyeglasses. This method is simple to operate, highly precise, and can be mass-produced, with low cost, making it suitable for widespread application.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a molding method for a bee-eye-like structure film, characterized by comprising mold making, microlens array structure film pressing and molding, and bonding the microlens array structure film to the eyeglass surface, wherein the mold making includes the following steps:

[0006] S1: Femtosecond laser modification

[0007] A hard material is selected and cleaned sequentially with alcohol, deionized water and ultrasonic water bath, and then fixed on the three-dimensional translation stage of the femtosecond laser machine. The femtosecond laser beam is then focused on the surface of the hard material through a focusing objective lens. By controlling the movement of the three-dimensional translation stage, the distance between adjacent irradiation points and their arrangement can be controlled, and the hard material can be modified by femtosecond laser irradiation to form a template sample.

[0008] S2: Wet etching

[0009] The template sample irradiated by femtosecond laser was placed in a hydrofluoric acid solution with a volume concentration of 8%-10% and chemically etched with the aid of an ultrasonic water bath. After 50-90 minutes of HF wet etching, a tightly arranged microlens array was formed on the template surface, forming a hard template.

[0010] S3: Clean and dry

[0011] The hard template after chemical etching is cleaned by sequentially cleaning with alcohol, deionized water and ultrasonic water bath, and then placed in a vacuum drying oven to dry for later use.

[0012] The microlens array structure film pressing and molding includes the following steps:

[0013] S4: Molding, mix the prepolymer with the curing agent, remove the internal air bubbles, and slowly immerse it into the dried hard template. After it has settled, put it in a high-temperature furnace and heat it to 80-100℃ for 2-3 hours to cure. After curing, take it out and demold it to obtain the microlens array structure film.

[0014] The bonding of the structural film to the eyeglass surface includes the following steps:

[0015] S5: Surface bonding, bonding the prepared microlens array structure film to the surface of the dried rigid template.

[0016] Preferably, in step S1, the hard material is a K9 glass sample or quartz.

[0017] Preferably, in step S4, the prepolymer is PDMS, which is mixed with the curing agent in a ratio of 10:1.

[0018] The spectacle lens manufactured by the molding method of the honeycomb-eye structure film is characterized by having the microlens array structure film bonded to the spectacle lens.

[0019] The beneficial effects of this invention are:

[0020] 1. Due to the precision and selectivity of femtosecond laser processing, microlenses have good morphology and can achieve precise control of various arrangement methods of microlens arrays;

[0021] 2. A rigid material mold for a microlens array is fabricated using a femtosecond laser, which can be used to mass-produce PDMS or PMMA films with a micro-convex lens array structure. The PDMS or PMMA film is then fixed onto the surface of eyeglasses. This method is simple to operate, highly precise, and can be mass-produced. It has a low cost and is therefore suitable for widespread application. Attached Figure Description

[0022] Figure 1 This illustration shows the femtosecond laser modification treatment applied to the sample surface according to the present invention.

[0023] Figure 2 This is a diagram illustrating the results of hydrofluoric acid wet etching used in this invention.

[0024] Figure 3 This is a diagram illustrating the molding process of the present invention.

[0025] Figure 4 This is a diagram illustrating the molding process of the present invention.

[0026] Among them: 1-objective lens, 2-laser, 3-ablation crater, 4-K9 glass substrate, 5-microconcave lens array, 6-PDMS substrate, 7-microconvex lens array, 8-eyeglass substrate. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] The molding process for a bee-eye-like structured membrane includes mold making, microlens array structured membrane pressing, and bonding the microlens array structured membrane to the eyeglass surface.

[0029] Example 1

[0030] Mold making includes the following steps:

[0031] S1: Femtosecond laser modification

[0032] A K9 glass sample was sequentially subjected to an ultrasonic water bath in alcohol and deionized water, and then fixed on the xyz three-dimensional translation stage of a femtosecond laser machine. A 3mW femtosecond laser beam was then focused onto the surface of the K9 glass sample through a focusing objective (preferably NA = 0.8). The center wavelength of the femtosecond laser was 800nm, the pulse width was 50fs, and the repetition frequency was 1kHz. By controlling the movement of the three-dimensional translation stage, the distance and arrangement of adjacent irradiation points were controlled, and the K9 glass sample underwent femtosecond laser irradiation modification treatment to form a template sample.

[0033] S2: Wet etching

[0034] The template sample, irradiated with a femtosecond laser, was placed in an 8% (v / v) hydrofluoric acid solution for chemical etching using an ultrasonic water bath. Due to the selective etching properties of the hydrofluoric acid solution, the etching rate of the ablated crater area and the surrounding modified area was much higher than that of the unmodified area. After 55 minutes of HF wet etching, a tightly packed array of microlenses formed on the template surface, creating a rigid template.

[0035] S3: Clean and dry

[0036] The hard template, after chemical etching, was cleaned by sequentially cleaning with alcohol, deionized water, and ultrasonic water bath, and then dried in a vacuum drying oven for later use.

[0037] The microlens array structure film pressing and molding includes the following steps:

[0038] S4: Molding. Mix PDMS prepolymer and curing agent in a ratio of 10:1. After removing the internal air bubbles, slowly immerse it into the dried hard template. After it has settled, place it in a high-temperature furnace and heat it to 80°C for 3 hours to cure. After curing, remove it and demold it to obtain a microlens array structure film of PDMS material.

[0039] The bonding of the structural film to the eyeglass surface includes the following steps:

[0040] S5: Surface bonding, bonding the prepared PDMS material microlens array structure film to the surface of the dried rigid template.

[0041] Example 2

[0042] Mold making includes the following steps:

[0043] S1: Femtosecond laser modification

[0044] K9 glass samples were sequentially subjected to ultrasonic water baths with alcohol and deionized water, and then fixed on the xyz three-dimensional translation stage of a femtosecond laser machine. The femtosecond laser beam was then focused on the surface of the K9 glass sample through a focusing objective lens. By controlling the movement of the three-dimensional translation stage, the distance and arrangement of adjacent irradiation points were controlled, and the K9 glass sample was subjected to femtosecond laser irradiation modification treatment to form a template sample.

[0045] S2: Wet etching

[0046] The template sample, after being irradiated by a femtosecond laser, was placed in a 9% hydrofluoric acid solution and subjected to chemical etching using an ultrasonic water bath. After 70 minutes of HF wet etching, a tightly arranged array of microlenses was formed on the template surface, thus creating a rigid template.

[0047] S3: Clean and dry

[0048] The hard template, after chemical etching, was cleaned by sequentially cleaning with alcohol, deionized water, and ultrasonic water bath, and then dried in a vacuum drying oven for later use.

[0049] The microlens array structure film pressing and molding includes the following steps:

[0050] S4: Molding, preferably using PMMA prepolymer, dissolving solid PMMA particles in acetone solution, the ratio is 4g PMMA dissolved in 20mL acetone, uniformly spreading the dissolved liquid on a glass slide to form a film, and waiting for the acetone to evaporate to form a film, then placing the film on a rigid template, and replicating the microlens array by high temperature and pressure at 75℃ (preferably, a 1*1cm template, a 2*2cm PMMA film, and a 1kg weight for pressure) and holding at the temperature for 2h.

[0051] The bonding of the structural film to the eyeglass surface includes the following steps:

[0052] S5: Surface bonding, bonding the prepared PMMA material microlens array structure film to the surface of the dried rigid template.

[0053] Example 3

[0054] Mold making includes the following steps:

[0055] S1: Femtosecond laser modification

[0056] K9 glass samples were sequentially subjected to ultrasonic water baths with alcohol and deionized water, and then fixed on the xyz three-dimensional translation stage of a femtosecond laser machine. The femtosecond laser beam was then focused on the surface of the K9 glass sample through a focusing objective lens. By controlling the movement of the three-dimensional translation stage, the distance and arrangement of adjacent irradiation points were controlled, and the K9 glass sample was subjected to femtosecond laser irradiation modification treatment to form a template sample.

[0057] S2: Wet etching

[0058] The template sample, after being irradiated by a femtosecond laser, was placed in a 10% hydrofluoric acid solution and subjected to chemical etching using an ultrasonic water bath. After 85 minutes of HF wet etching, a tightly arranged array of microlenses was formed on the template surface, thus creating a rigid template.

[0059] S3: Clean and dry

[0060] The hard template, after chemical etching, was cleaned by sequentially cleaning with alcohol, deionized water, and ultrasonic water bath, and then dried in a vacuum drying oven for later use.

[0061] The microlens array structure film pressing and molding includes the following steps:

[0062] S4: Molding. Mix PDMS prepolymer and curing agent in a ratio of 10:1. After removing the internal air bubbles, slowly immerse it into the dried hard template. After it has settled, place it in a high-temperature furnace and heat it to 100°C for 2 hours to cure. After curing, remove it and demold it to obtain a microlens array structure film of PDMS material.

[0063] The bonding of the structural film to the eyeglass surface includes the following steps:

[0064] S5: Surface bonding, bonding the prepared PDMS material microlens array structure film to the surface of the dried rigid template.

[0065] Example 4

[0066] Mold making includes the following steps:

[0067] S1: Femtosecond laser modification

[0068] Quartz was selected and subjected to ultrasonic water baths in alcohol and deionized water in sequence. It was then fixed on the xyz three-dimensional translation stage of a femtosecond laser machine. The femtosecond laser beam was then focused on the surface of the quartz through a focusing objective lens. By controlling the movement of the three-dimensional translation stage, the distance between adjacent irradiation points and their arrangement could be controlled, and the quartz was subjected to femtosecond laser irradiation modification treatment to form a template sample.

[0069] S2: Wet etching

[0070] The template sample, after being irradiated by a femtosecond laser, was placed in a 9% hydrofluoric acid solution and subjected to chemical etching using an ultrasonic water bath. After 60 minutes of HF wet etching, a tightly arranged array of microlenses was formed on the template surface, thus creating a rigid template.

[0071] S3: Clean and dry

[0072] The hard template, after chemical etching, was cleaned by sequentially cleaning with alcohol, deionized water, and ultrasonic water bath, and then dried in a vacuum drying oven for later use.

[0073] The microlens array structure film pressing and molding includes the following steps:

[0074] S4: Molding. Mix PMMA prepolymer and curing agent in a ratio of 10:1. After removing the internal air bubbles, slowly immerse it into the dried hard template. After it has settled, place it in a high-temperature furnace and heat it to 90°C for 2.5 hours to cure. After curing, remove it and demold it to obtain a microlens array structure film of PMMA material.

[0075] The bonding of the structural film to the eyeglass surface includes the following steps:

[0076] S5: Surface bonding, bonding the prepared PMMA material microlens array structure film to the dried surface of the rigid template. Preferably, the microlens film can also be fixed to the eyeglass surface using a transparent adhesive.

[0077] The principle of this invention is as follows: a microlens array is fabricated on a hard and brittle material substrate using femtosecond laser wet etching technology; a structure with a microconvex lens array is obtained by molding using PDMS or PMMA replication technology; then, the PDMS film is bonded to a lens to obtain a lens with anti-myopia effect. The hard material mold for the microlens array prepared by the simple steps disclosed in this invention can be used to replicate PDMS or PMMA films with a microconvex lens array structure in large quantities. Then, the PDMS or PMMA film is fixed to the surface of the glasses. This method is simple to operate, has high precision, can be mass-produced, and has low cost, making it suitable for widespread application.

[0078] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for molding a honeycomb-eye structure membrane, characterized in that, The process includes mold making, microlens array structure film pressing and molding, and bonding the microlens array structure film to the eyeglass surface. The mold making includes the following steps: S1: Femtosecond laser modification A hard material is selected and cleaned sequentially with alcohol, deionized water and ultrasonic water bath, and then fixed on the three-dimensional translation stage of the femtosecond laser machine. The femtosecond laser beam is then focused on the surface of the hard material through a focusing objective lens. By controlling the movement of the three-dimensional translation stage, the distance between adjacent irradiation points and their arrangement can be controlled, and the hard material can be modified by femtosecond laser irradiation to form a template sample. S2: Wet etching The template sample irradiated by femtosecond laser was placed in a hydrofluoric acid solution with a volume concentration of 8%-10% and chemically etched with the aid of an ultrasonic water bath. After 50-90 minutes of HF wet etching, a tightly arranged microlens array was formed on the template surface, forming a hard template. S3: Clean and dry The hard template after chemical etching is cleaned by sequentially cleaning with alcohol, deionized water and ultrasonic water bath, and then placed in a vacuum drying oven to dry for later use. The microlens array structure film pressing and molding includes the following steps: S4: Molding, mix the prepolymer with the curing agent, remove the internal air bubbles, and slowly immerse it into the dried hard template. After it has settled, put it in a high-temperature furnace and heat it to 80-100℃ for 2-3 hours to cure. After curing, take it out and demold it to obtain the microlens array structure film. The bonding of the structural film to the eyeglass surface includes the following steps: S5: Surface bonding, bonding the prepared microlens array structure film to the surface of the dried rigid template.

2. The molding method for producing the honeycomb-eye structure membrane according to claim 1, characterized in that: In step S1, the hard material is a K9 glass sample or quartz.

3. The molding method for producing the honeycomb-eye structure membrane according to claim 2, characterized in that: In step S4, the prepolymer is PDMS, which is mixed with the curing agent in a ratio of 10:

1.

4. The spectacle lens manufactured by the molding method of the honeycomb-eye structure film according to claim 1, characterized in that: The microlens array structure film is bonded to the eyeglass lens.

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