Lens manufacturing method and system, and progressive lens

Abstract

The present invention provides a lens manufacturing method and system, a progressive lens, and a repair method. A photoresist is coated on a lens substrate; laser light emitted by a laser system reacts with the photoresist to photopolymerize the photoresist, thereby etching a predetermined micro-nanostructure onto the lens substrate. This results in a lens having a predetermined micro-nanostructure layout. The lens achieves a desired refractive index distribution through the predetermined micro-nanostructure layout. The present invention provides higher-precision processing capabilities, smoother refractive index transitions, and greater design and manufacturing flexibility, thereby meeting market demand for high-quality progressive lenses. The high-precision progressive lens manufacturing method proposed in the present invention addresses the limitations of traditional processes and aims to improve the optical performance of progressive lenses and the user's visual experience.

Description

Technical Field

[0001] The present invention relates to the technical field of lens manufacturing, and in particular to a lens manufacturing method and system, a progressive lens, and a repair method. Background Art

[0002] A progressive lens is a multifocal lens, meaning it has multiple focal points. This multifocal design meets the wearer's visual needs at different distances (near, medium, and far) and in different environments. It's widely popular because it provides a seamless visual experience, enabling clear focus from near to far distances. Patent document CN113334649A discloses a method for machine-making a full-field curved progressive lens, including the following steps: First, the center of the grinding circle is fixed outside the mold core, allowing the auxiliary secondary mold core to fit the original mother mold core; Second, a secondary mold core with an increased radius is used to draw a circle to produce the desired curvature, with the grinding range including the original mother mold core; Third, grinding and engraving is performed with the secondary mold core's center as the center point, within the radius of the secondary mold core.

[0003] However, this type of traditional progressive lens manufacturing process faces multiple limitations, which are mainly manifested in the following aspects:

[0004] 1. Processing accuracy limitations:

[0005] Traditional progressive lenses are primarily manufactured through mechanical grinding and polishing processes, which struggle to achieve micron- or nanometer-level processing precision. Consequently, there are limitations in the ability to fine-tune the optical properties of these lenses, particularly in achieving complex refractive index profiles.

[0006] 2. The refractive index transition is not smooth:

[0007] Due to the limitations of processing technology, the refractive index changes between different visual zones of traditional progressive lenses are often not smooth enough, resulting in users experiencing visual abrupt changes or discomfort when switching from close-up to long-distance vision.

[0008] 3. Insufficient flexibility in design and manufacturing:

[0009] Traditional processes for designing and manufacturing progressive lenses are often limited by the physical grinding process, which restricts the freedom and innovation of lens design. This is especially true for progressive lenses that require personalized designs, where existing technologies struggle to meet the cost and efficiency requirements.

[0010] 4. Low material utilization and cost issues:

[0011] Mechanical grinding and polishing not only takes a long time to process, but also causes a lot of material loss, which is particularly costly when manufacturing lenses made of high-refractive-index materials. In addition, this processing method also involves environmental pollution and other issues.

[0012] 5. User customization requirements are difficult to meet:

[0013] As users' requirements for visual quality increase, the demand for personalized lens design is increasing. However, traditional processes have limitations in meeting user customization needs, especially in precisely adjusting the optical performance of lenses to suit specific vision conditions. Summary of the Invention

[0014] In view of the defects in the prior art, the purpose of the present invention is to provide a lens manufacturing method and system, a progressive lens, a detection system, and a repair method.

[0015] A lens manufacturing method according to the present invention comprises:

[0016] coating a photoresist on a lens substrate;

[0017] Through the photopolymerization reaction between the laser emitted by the laser system and the photoresist, a preset micro-nano structure is photoetched on the lens substrate to obtain a lens with a micro-nano structure in a preset layout. The lens achieves the required refractive index distribution through the micro-nano structure in the preset layout.

[0018] Furthermore, the photoresist is a photoresist with two-photon absorption characteristics, and the photolithography is two-photon lithography;

[0019] The refractive index of the photoresist is between 1.5 and 1.9;

[0020] The thickness of the photoresist coating is greater than or equal to 100 nm;

[0021] The methods of applying photoresist include spin coating, drop coating or spray coating.

[0022] Furthermore, before applying the photoresist, the method further comprises: performing pre-treatment on the surface of the lens substrate, wherein the pre-treatment comprises: cleaning, degreasing or surface activation;

[0023] After applying the photoresist, the method further includes: pre-curing the applied photoresist, wherein the pre-curing method includes heat treatment to volatilize the photoresist, and the volatilization amount is less than or equal to 40%;

[0024] After the photolithography, the process further includes: performing post-processing on the surface of the lens substrate, wherein the post-processing includes: removing the remaining photoresist on the lens substrate, adding an anti-reflective coating, adding a waterproof coating, or performing optical performance testing.

[0025] Furthermore, the minimum characteristic size of the micro-nano structure is 50 nanometers;

[0026] By coating photoresists with different refractive indices respectively and carrying out photopolymerization reaction, micro-nano structures with at least two optical properties are obtained on the same lens substrate.

[0027] A progressive lens provided by the present invention comprises a lens and a micro-nano structure formed on the lens by photopolymerization reaction, wherein the desired refractive index distribution is achieved through the micro-nano structure in a preset layout.

[0028] Furthermore, the micro-nano structure includes an optical waveguide or an optical antenna;

[0029] The micro-nano structure is designed to modulate the polarization state of light passing through the lens to provide a polarization modulation function; alternatively, the micro-nano structure is designed to implement a temperature response function of the lens, thereby adjusting the optical performance of the lens by changing the state of the temperature-sensitive material inside the lens.

[0030] Furthermore, the surface of the progressive lens has an anti-scratch coating, an anti-ultraviolet coating, an anti-blue light coating, a super-hydrophobic coating or a super-oleophobic coating.

[0031] Furthermore, the minimum characteristic size of the micro-nano structure is 50 nanometers;

[0032] The lens has a micro-nano structure with one or more optical properties.

[0033] According to the present invention, a lens manufacturing system is provided, comprising: a femtosecond laser, a focusing optical system, a three-dimensional mobile platform, a photoresist feeding device, and software for designing and simulating micro-nanostructures;

[0034] The three-dimensional moving platform is configured to load and move the lens substrate and drive the lens substrate to rotate;

[0035] The photoresist feeding device is configured to apply photoresist to the lens substrate;

[0036] The femtosecond laser is configured to perform photolithography on the lens substrate coated with photoresist according to the micro-nanostructure pattern provided by the software, thereby obtaining a micro-nanostructure corresponding to the micro-nanostructure pattern on the lens substrate, and achieving a desired refractive index distribution through the micro-nanostructure;

[0037] The focusing optical system is configured to control the scanning speed and focal length of the laser light emitted by the femtosecond laser.

[0038] A lens repair method provided by the present invention includes using the lens manufacturing method to locally repair damaged micro-nano structures on the lens.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. Precise Optical Performance Control: This invention enables the micro-nanostructures formed within progressive lenses to be precisely engineered down to the nanometer level. This level of control allows for more precise adjustment of the refractive index, significantly improving the lens' optical performance. Users experience a smoother visual transition from near to far, minimizing the discomfort associated with sudden changes in refractive index.

[0041] 2. Improved visual quality: By meticulously controlling the internal structure of the lens, visual distortion and astigmatism are effectively reduced, particularly in the transition zone of progressive lenses. This means users experience clearer, more stable vision when switching between viewing distances, enhancing the overall visual quality of progressive lenses.

[0042] 3. Highly Customizable Design Capabilities: Utilizing two-photon micro-nanofabrication technology, progressive lenses can be customized based on the user's specific vision needs and usage habits. This highly customized capability allows each user to choose the progressive lens that best suits them, significantly improving both adaptability to specific work environments and comfort in daily life.

[0043] 4. Expanded Lens Functionality: This invention not only optimizes the optical performance of the lens but also, through the selection of photoresist materials with specialized functions, adds additional features such as UV protection and blue light filtering. These expanded functionalities further enhance the practical value of progressive lenses and the user experience.

[0044] 5. Environmentally friendly and cost-effective: Compared to traditional physical grinding and polishing methods, the application of two-photon micro-nanofabrication technology significantly reduces material waste and production costs. Furthermore, this dry processing reduces the generation of chemical waste, is environmentally friendly, and aligns with the concept of green manufacturing.

[0045] 6. Enhanced durability and stability: Two-photon micro-nanofabrication technology creates stable micro-nanostructures within lenses that are highly resistant to temperature fluctuations and physical wear. As a result, progressive lenses manufactured using this technology may have a longer lifespan and greater durability than traditional lenses.

[0046] 7. Improved anti-reflection and anti-fog properties: By designing specific micro-nanostructures, a highly effective anti-reflection layer can be formed on the lens surface, reducing light scattering and reflection, thereby improving light transmittance and clarity. Furthermore, these structures can help control moisture condensation, thereby providing an anti-fog effect.

[0047] 8. Rapidly responsive manufacturing: Compared to traditional manufacturing processes, two-photon micro-nanofabrication technology enables rapid transition from design to finished product, shortening product development cycles. This feature is particularly suitable for scenarios requiring rapid iteration and personalized production.

[0048] 9. No need for expensive molds and equipment: Unlike traditional lens production methods that rely on specific molds, the flexibility of two-photon micro-nanofabrication technology allows switching between different designs without the need for additional molds or equipment changes, thereby reducing production costs and improving manufacturing efficiency.

[0049] 10. Multifunctional integrated design: Utilizing two-photon micro-nano processing technology, multiple functions can be integrated into a single lens, such as focusing, filtering, and self-repair, achieving innovative product design with multiple uses, meeting the needs of modern consumers for high-tech eyewear. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0051] Figure 1 It is the workflow diagram of the present invention. DETAILED DESCRIPTION

[0052] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0053] Example 1

[0054] like Figure 1 As shown, the present invention provides a method for manufacturing a lens, comprising:

[0055] Design and Simulation: Optical design software is used to design the preliminary structure of the progressive lens based on the requirements, ensuring the lens design provides a seamless visual transition from near to far distances. Computer simulation techniques are used to simulate the light propagation path through the lens to ensure that the designed micro-nanostructures achieve the desired refractive index gradient and optical effect. Parameters such as the length, width, height, and spacing of each micro-nanostructure can be defined in detail. During the design process, the overall shape and size of the lens are fully considered to ensure the compatibility of the micro-nanostructures with the lens. After simulation, the design files are converted into scanning path files that can be recognized by the laser system. Two-photon micro-nanofabrication technology achieves processing accuracy as low as 50 nanometers, precisely controlling the internal optical structure of the lens and optimizing the light propagation path. The lens substrate can have one concave and one convex surface, and the micro-nanostructures can be placed on the concave or convex surface, or even both.

[0056] Micro-nanostructures include micropillar arrays and gradient microlenses. In the far-field vision zone, a micropillar array with a relatively fixed height and diameter can be designed. By adjusting the refractive index of the micropillar material and the density of its arrangement, the relatively stable refractive power required in this area can be achieved. In the transition and near-field vision zones, a gradient microlens structure is used. The radius of curvature of the microlenses gradually decreases from the far-field vision zone to the near-field vision zone, achieving a smooth transition in refractive power. For example, the diameter of each microlens can be controlled between 15 and 25 microns. By adjusting the height and curvature of the microlenses, the refraction angle of light can be precisely controlled to meet vision correction needs at different distances. For example, at the beginning of the transition zone, the microlens height is 12 microns and the radius of curvature is 30 microns. In the near-field vision zone, the microlens height increases to 18 microns and the radius of curvature decreases to 20 microns.

[0057] The distribution of micro-nanostructures includes both axial and radial distribution. Along the vertical direction of the lens (from top to bottom), the axial distribution of the micro-nanostructures is designed based on a pre-simulated refractive index distribution model. In the distance vision zone, the micro-nanostructures remain evenly distributed. In the transition zone, the size and density of the micro-nanostructures change according to a gradient function, such as a linear or S-shaped gradient, to ensure a smooth transition in refractive power. In the near vision zone, the final distribution of the micro-nanostructures is determined based on the desired near-distance vision correction. Considering that in actual lens use, the human eye's line of sight is not always vertically downward, but also exhibits some horizontal and tilted movement. Therefore, the micro-nanostructures are optimally distributed in the radial direction (the horizontal direction centered around the lens center). In the center of the lens, the micro-nanostructures are densely and evenly distributed to ensure central vision clarity. This distribution gradually becomes sparser towards the periphery, while the shape and size of the micro-nanostructures are fine-tuned to compensate for aberrations caused by refraction at the periphery, ensuring optimal vision throughout the entire visual range.

[0058] Pretreatment: The lens substrate surface undergoes pretreatment, which may include cleaning, degreasing, or surface activation. For example, the lens substrate can be cleaned with anhydrous ethanol to remove visible dust, particles, and other impurities. The lens substrate is then placed in an ultrasonic cleaner filled with acetone solution. Acetone, a commonly used organic solvent, has excellent dissolving power for grease. The ultrasonic cleaner should be set to a power of 50-100 watts and a frequency of 40-60 kHz for 10-15 minutes. The ultrasonic wave allows the acetone to penetrate deeper into the tiny crevices and pores on the lens surface, thoroughly dissolving and removing grease. After cleaning, remove the lens substrate and rinse it 3-5 times with deionized water to remove any residual acetone solution. Finally, prepare a 5%-10% sodium hydroxide (NaOH) solution and soak the rinsed lens in it. The NaOH solution chemically reacts with molecules on the lens surface, creating more reactive groups on the surface and enhancing the adhesion of the photoresist to the lens. The immersion time is controlled to 5-10 minutes, after which the lens is rinsed again with plenty of deionized water to ensure that any residual NaOH solution on the surface is completely removed. Finally, the lens is placed in a clean environment to air dry or blown dry with nitrogen. This series of cleaning, degreasing, and surface activation steps are followed by the subsequent photoresist coating step, which effectively improves the lithography quality and the stability of the micro-nanostructure.

[0059] Photoresist coating: Photoresist is applied to the lens substrate. The methods for applying photoresist are not limited to spin coating, drip coating, or spray coating. The thickness of the photoresist coating should be greater than or equal to 100nm. When choosing a photoresist, use one with two-photon absorption properties. The refractive index of the photoresist should be between 1.5 and 1.9 to meet the requirements of different optical designs. This range of refractive indices covers most visual applications and provides a wider range of lens design options. For spin coating, for example, the spin coater speed is controlled between 1000-3000 rpm for 30-60 seconds. After applying the photoresist, the coated photoresist is pre-cured. This pre-curing method includes heat treatment to volatilize the photoresist, with the volatilization amount being less than or equal to 40%.

[0060] Two-photon polymerization: The laser system, based on the scan path file, triggers a photopolymerization reaction between the emitted laser light and the photoresist, etching the pre-defined micro-nanostructure onto the lens substrate. This results in a lens with a pre-defined micro-nanostructure layout. This pre-defined micro-nanostructure layout achieves the desired refractive index distribution. Specifically, the photoresist-coated lens is placed on the high-precision workbench of the two-photon lithography system, where an optical positioning system is used to precisely position and align the lens. The workbench position is adjusted to ensure that the processing area of ​​the lens is within the effective scanning range of the laser beam and that the center of the lens coincides with the origin of the scanning coordinate system. Based on the pre-designed micro-nanostructure layout, the corresponding scanning parameters, including scanning speed, scanning path, and laser energy, are entered into the lithography system's control software. For example, the scanning speed is generally controlled between 1 and 10 mm / s to ensure sufficient time for the photoresist to absorb two photons and undergo photopolymerization. During the scanning process, the laser energy and spot size are monitored in real time to ensure stability. For complex micro-nano structures, a combination of layered scanning and spiral scanning is used. A coarse scan is first performed to determine the general outline, and then a fine scan is performed to improve the accuracy and surface quality of the structure.

[0061] After photolithography, the lens substrate undergoes post-processing, including removing any remaining photoresist, applying an anti-reflective coating, adding a water-repellent coating, or testing optical properties. For example, after photolithography, the lens is placed in a developer to remove any unpolymerized photoresist. A developer suitable for the photoresist is selected. For example, for common positive-tone photoresists, tetramethylammonium hydroxide (TMAH) can be diluted in a 1:4 ratio with deionized water. The lens is immersed in the developer for 3-5 minutes while simultaneously applying ultrasonic vibration at a frequency of 40-60 kHz to accelerate the development process, ensuring complete removal of the photoresist and preventing any residue that could affect the lens' optical performance. After development, the lens is rinsed multiple times with deionized water to remove any residual developer and impurities. The lens is then immersed in an isopropyl alcohol solution for 1-2 minutes to dehydrate. Finally, the lens is dried using nitrogen blow-drying or vacuum drying to ensure no residual moisture remains on the surface, preventing water stains or oxidation. High-precision optical inspection equipment, such as atomic force microscopes (AFMs) and scanning electron microscopes (SEMs), is used to perform microscopic morphology inspection on the micro-nanostructures after photolithography, checking their dimensional accuracy, shape integrity, and surface roughness. Interferometers are also used to measure the surface accuracy of the lens, and a focal meter is used to measure the refractive power of different regions of the lens. The test results are then compared and analyzed with the design values. If dimensional deviations, surface defects, or substandard optical performance of the micro-nanostructure are detected, optimization efforts are made by adjusting photolithography parameters or performing secondary photolithography to ensure that the lens quality meets design requirements.

[0062] In the present invention, the micro-nanostructures on the same lens can have the same or different optical properties. To obtain micro-nanostructures with different optical properties, photoresists with different refractive indices can be applied and photopolymerized to form micro-nanostructures with at least two optical properties on the same lens substrate.

[0063] Example 2

[0064] A progressive lens can be prepared using the method of Example 1, comprising a lens and a micro-nanostructure formed on the lens by a photopolymerization reaction. The desired refractive index distribution is achieved by the micro-nanostructure in a preset layout to provide a progressive visual effect. The lens has micro-nanostructures with one or more optical properties. For the micro-nanostructures, parameters such as the length, width, height, and spacing of each micro-nanostructure can be defined in detail. During the design process, the overall shape and size of the lens are fully considered to ensure the compatibility of the micro-nanostructure with the lens. After simulation, the design file is converted into a scanning path file that can be recognized by the laser system. Through two-photon micro-nanoprocessing technology, a processing accuracy of at least 50 nanometers is achieved, the optical structure inside the lens is precisely controlled, and the light propagation path is optimized.

[0065] Micro-nano structures include micropillar arrays and gradient microlenses. In the distance vision zone, a micropillar array with a relatively fixed height and diameter can be designed. By adjusting the refractive index of the micropillar material and the density of the arrangement, the relatively stable refractive power required in this area can be achieved. In the transition and near vision zones, a gradient microlens structure is used. The radius of curvature of the microlens gradually decreases from the distance to the near vision zone, achieving a smooth transition in refractive power. By adjusting the height and curvature of the microlens, the refraction angle of light can be precisely controlled to meet the vision correction needs at different distances.

[0066] The distribution of micro-nanostructures includes both axial and radial distribution. Along the vertical direction of the lens (from top to bottom), the axial distribution of the micro-nanostructures is designed based on a pre-simulated refractive index distribution model. In the distance vision zone, the micro-nanostructures remain evenly distributed. In the transition zone, the size and density of the micro-nanostructures change according to a gradient function, such as a linear or S-shaped gradient, to ensure a smooth transition in refractive power. In the near vision zone, the final distribution of the micro-nanostructures is determined based on the desired near-distance vision correction. Considering that in actual lens use, the human eye's line of sight is not always vertically downward, but also exhibits some horizontal and tilted movement. Therefore, the micro-nanostructures are optimally distributed in the radial direction (the horizontal direction centered around the lens center). In the center of the lens, the micro-nanostructures are densely and evenly distributed to ensure central vision clarity. This distribution gradually becomes sparser towards the periphery, while the shape and size of the micro-nanostructures are fine-tuned to compensate for aberrations caused by refraction at the periphery, ensuring optimal vision throughout the entire visual range. The surface of progressive lenses can be coated with anti-scratch coatings, UV protection coatings, blue light protection coatings, super-hydrophobic coatings, or super-oleophobic coatings. Micro QR codes or holographic marks for data storage or identity verification can be integrated into the lens surface using two-photon micro-nanofabrication technology.

[0067] Taking myopia lenses as an example, micro-nano structures can be set on the concave surface of the lens, and the micro-nano structures are arranged in an array. They can change the propagation and scattering characteristics of the lens for light, thereby adjusting the contrast of light entering the eye to achieve specific visual effects and physiological effects, which has a positive effect on myopia prevention and control; under the action of multiple evenly distributed micro-nano structures, the contrast control function and the optical path difference regulation function can be realized simultaneously. Micro-nano structures are structures with nanoscale characteristic dimensions and work based on the principle of light diffraction. Nanoscale diffraction structures have periodicity that is precisely controlled at the nanoscale. This periodic structure can produce a specific diffraction effect on the incident light. The size of its period is related to the wavelength of the target light and is generally within a certain proportional range of the target wavelength, for example, within the range of 0.75λ to 3λ of the target wavelength λ. In some embodiments, the defocus amount De of the micro-nano structure satisfies: +4.00 D≤De≤+10.00D, where D represents diopter and +10.00D is the extreme defocus; the microlens 3 reaches the extreme defocus within an 8° field of view, and the defocus amount of the micro-nano structure is positively correlated with the field of view. The defocus amount increases with the increase of the field of view, and the effective defocus amount of the micro-nano structure area is larger, with ultra-low disturbance, better compliance and better control effect; the present application optimizes the defocus design to be more in line with the physiological characteristics of the human eye, and the effect of the macular area and the enhancement effect is better. Based on the array arrangement, the micro-nano structure can also be a layered stacked structure obtained by coating photoresists of different refractive indices and performing photopolymerization reaction in Example 1. The number of micro-nano structures on the lens exceeds 33,000, and a large number of micro-nano structures are arranged per unit area of ​​the mirror to achieve high-intensity optical path difference control. In the embodiments of the present application, it can be understood that a continuous ultra-low disturbance defocus zone is formed by more than 33,000 micro-nano structures; the microlenses of current conventional myopia prevention and control lenses are relatively large and usually 0.8mm-2mm; the present application significantly reduces the size of the micro-nano structure so that more micro-nano structures can be accommodated per unit area, thereby achieving high-intensity optical path difference regulation and further achieving contrast control.

[0068] In the present invention, the micro-nano structure includes an optical waveguide or an optical antenna, and can also be integrated with an organic light-emitting diode (OLED) or other light sources to achieve self-luminous function for visual assistance in low-light environments.

[0069] In other embodiments, the micro-nanostructures can be designed to modulate the polarization state of light passing through the lens to provide polarization modulation functionality; alternatively, the micro-nanostructures can be designed to implement a temperature-responsive lens, adjusting the lens's optical performance by changing the state of the temperature-sensitive material within the lens. Micro-nanostructures can also be designed as adjustable optical elements, such as adjustable focus lenses or gratings, to adapt to the user's dynamic visual needs.

[0070] Example 3

[0071] A lens manufacturing system includes a femtosecond laser, a focusing optical system, a three-dimensional mobile platform, a photoresist feeding device, and software for designing and simulating micro-nanostructures. The three-dimensional mobile platform is configured to load, move, and rotate a lens substrate. The photoresist feeding device is configured to apply photoresist to the lens substrate. The femtosecond laser is configured to perform photolithography on the photoresist-coated lens substrate according to a micro-nanostructure pattern provided by the software, thereby obtaining a micro-nanostructure corresponding to the micro-nanostructure pattern on the lens substrate. The desired refractive index distribution is achieved through the micro-nanostructure. The focusing optical system is configured to control the scanning speed and focal length of the laser light emitted by the femtosecond laser.

[0072] In other embodiments, the manufacturing system further includes a real-time monitoring and quality inspection device for monitoring the manufacturing process and verifying the optical performance of the lens.

[0073] Example 4

[0074] A lens repair method comprises using the lens manufacturing method described in Example 1 to locally repair damaged micro-nano structures on the lens.

[0075] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0076] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A method for manufacturing a lens, characterized in that: include: coating a photoresist on a lens substrate; Through a photopolymerization reaction between laser light emitted by a laser system and the photoresist, a predetermined micro-nano structure is photoetched on the lens substrate to obtain a lens having a predetermined layout of micro-nano structures, wherein the lens achieves a desired refractive index distribution through the predetermined layout of micro-nano structures; The minimum characteristic size of the micro-nano structure is 50 nanometers; By coating photoresists of different refractive indices and performing photopolymerization reaction, micro-nano structures with at least two optical properties are obtained on the same lens substrate; The micro-nano structure includes a micro-pillar array and a gradient micro-lens. In the far-sighted area of ​​the lens, a micro-pillar array with relatively fixed height and diameter is designed. By adjusting the material refractive index and arrangement density of the micro-pillar array, a relatively stable refractive power required for the far-sighted area is achieved. In the transition zone and near-sighted area, a gradient micro-lens structure is adopted. The curvature radius of the gradient micro-lens gradually decreases from the far-sighted area to the near-sighted area to achieve a smooth transition of refractive power. By adjusting the height and curvature of the micro-lens, the refraction angle of light is controlled to meet the vision correction needs at different distances. The distribution of micro-nanostructures includes axial distribution and radial distribution; In terms of axial distribution: the axial direction refers to the distance from the top to the bottom of the lens. In the far-sighted area, the micro-nano structures are evenly distributed. In the transition area, the size and arrangement density of the micro-nano structures change according to a linear gradient or S-shaped gradient function to ensure a smooth transition of refractive power. In the near-sighted area, the final distribution state of the micro-nano structures is determined according to the needs of near-distance vision correction. In radial distribution: The radial direction refers to the horizontal direction with the center of the lens as the center of the circle. In the central area of ​​the lens, the distribution of micro-nano structures is relatively dense and uniform to ensure the clarity of central vision; it gradually becomes sparse towards the edge area, and the shape and size of the micro-nano structures are fine-tuned to compensate for the aberration caused by refraction at the edge. The defocus amount De of the micro-nano structure satisfies: +4.00 D≤De≤+10.00D, where D represents the diopter and +10.00D is the extreme defocus. The microlens reaches the extreme defocus within an 8° field of view. The defocus amount of the micro-nano structure is positively correlated with the field of view. The defocus amount increases with the increase of the field of view, and the effective defocus amount of the micro-nano structure area is greater.

2. The lens manufacturing method according to claim 1, characterized in that: The photoresist is a photoresist with two-photon absorption characteristics, and the photolithography is two-photon lithography; The refractive index of the photoresist is between 1.5 and 1.9; The thickness of the photoresist coating is greater than or equal to 100 nm; The methods of applying photoresist include spin coating, drop coating or spray coating.

3. The lens manufacturing method according to claim 1, wherein: Before applying the photoresist, the method further comprises: performing pre-treatment on the surface of the lens substrate, wherein the pre-treatment comprises: cleaning, degreasing or surface activation; After applying the photoresist, the method further includes: pre-curing the applied photoresist, wherein the pre-curing method includes heat treatment to volatilize the photoresist, and the volatilization amount is less than or equal to 40%; After the photolithography, the process further includes: performing post-processing on the surface of the lens substrate, wherein the post-processing includes: removing the remaining photoresist on the lens substrate, adding an anti-reflective coating, adding a waterproof coating, or performing optical performance testing.

4. A progressive lens, characterized in that: The lens comprises a micro-nanostructure formed on the lens by photopolymerization, wherein the micro-nanostructure with a preset layout achieves a desired refractive index distribution; The minimum characteristic size of the micro-nano structure is 50 nanometers; By coating photoresists of different refractive indices and performing photopolymerization reaction, micro-nano structures with at least two optical properties are obtained on the same lens substrate; The micro-nano structure includes a micro-pillar array and a gradient micro-lens. In the far-sighted area of ​​the lens, a micro-pillar array with relatively fixed height and diameter is designed. By adjusting the material refractive index and arrangement density of the micro-pillar array, a relatively stable refractive power required for the far-sighted area is achieved. In the transition zone and near-sighted area, a gradient micro-lens structure is adopted. The curvature radius of the gradient micro-lens gradually decreases from the far-sighted area to the near-sighted area to achieve a smooth transition of refractive power. By adjusting the height and curvature of the micro-lens, the refraction angle of light is controlled to meet the vision correction needs at different distances. The distribution of micro-nanostructures includes axial distribution and radial distribution; In terms of axial distribution: the axial direction refers to the distance from the top to the bottom of the lens. In the far-sighted area, the micro-nano structures are evenly distributed. In the transition area, the size and arrangement density of the micro-nano structures change according to a linear gradient or S-shaped gradient function to ensure a smooth transition of refractive power. In the near-sighted area, the final distribution state of the micro-nano structures is determined according to the needs of near-distance vision correction. In radial distribution: The radial direction refers to the horizontal direction with the center of the lens as the center of the circle. In the central area of ​​the lens, the distribution of micro-nano structures is relatively dense and uniform to ensure the clarity of central vision; it gradually becomes sparse towards the edge area, and the shape and size of the micro-nano structures are fine-tuned to compensate for the aberration caused by refraction at the edge. The defocus amount De of the micro-nano structure satisfies: +4.00 D≤De≤+10.00D, where D represents the diopter and +10.00D is the extreme defocus. The microlens reaches the extreme defocus within an 8° field of view. The defocus amount of the micro-nano structure is positively correlated with the field of view. The defocus amount increases with the increase of the field of view, and the effective defocus amount of the micro-nano structure area is greater.

5. The progressive lens according to claim 4, characterized in that The micro-nano structure includes an optical waveguide or an optical antenna; The micro-nano structure is designed to modulate the polarization state of light passing through the lens to provide a polarization modulation function; alternatively, the micro-nano structure is designed to implement a temperature response function of the lens, thereby adjusting the optical performance of the lens by changing the state of the temperature-sensitive material inside the lens.

6. The progressive lens according to claim 4, characterized in that The surface of the progressive lens has an anti-scratch coating, an anti-ultraviolet coating, an anti-blue light coating, a super-hydrophobic coating or a super-oleophobic coating.

7. A lens manufacturing system, characterized in that: include: Femtosecond lasers, focusing optical systems, three-dimensional motion platforms and photoresist feeding devices, as well as software for designing and simulating micro- and nanostructures; The three-dimensional moving platform is configured to load and move the lens substrate and drive the lens substrate to rotate; The photoresist feeding device is configured to apply photoresist to the lens substrate; The femtosecond laser is configured to perform photolithography on the lens substrate coated with photoresist according to the micro-nanostructure pattern provided by the software, thereby obtaining a micro-nanostructure corresponding to the micro-nanostructure pattern on the lens substrate, and achieving a desired refractive index distribution through the micro-nanostructure; The focusing optical system is configured to control the scanning speed and focal length of the laser light emitted by the femtosecond laser; The minimum characteristic size of the micro-nano structure is 50 nanometers; By coating photoresists of different refractive indices and performing photopolymerization reaction, micro-nano structures with at least two optical properties are obtained on the same lens substrate; The micro-nano structure includes a micro-pillar array and a gradient micro-lens. In the far-sighted area of ​​the lens, a micro-pillar array with relatively fixed height and diameter is designed. By adjusting the material refractive index and arrangement density of the micro-pillar array, a relatively stable refractive power required for the far-sighted area is achieved. In the transition zone and near-sighted area, a gradient micro-lens structure is adopted. The curvature radius of the gradient micro-lens gradually decreases from the far-sighted area to the near-sighted area to achieve a smooth transition of refractive power. By adjusting the height and curvature of the micro-lens, the refraction angle of light is controlled to meet the vision correction needs at different distances. The distribution of micro-nanostructures includes axial distribution and radial distribution; In terms of axial distribution: the axial direction refers to the distance from the top to the bottom of the lens. In the far-sighted area, the micro-nano structures are evenly distributed. In the transition area, the size and arrangement density of the micro-nano structures change according to a linear gradient or S-shaped gradient function to ensure a smooth transition of refractive power. In the near-sighted area, the final distribution state of the micro-nano structures is determined according to the needs of near-distance vision correction. In radial distribution: The radial direction refers to the horizontal direction with the center of the lens as the center of the circle. In the central area of ​​the lens, the distribution of micro-nano structures is relatively dense and uniform to ensure the clarity of central vision; it gradually becomes sparse towards the edge area, and the shape and size of the micro-nano structures are fine-tuned to compensate for the aberration caused by refraction at the edge. The defocus amount De of the micro-nano structure satisfies: +4.00 D≤De≤+10.00D, where D represents the diopter and +10.00D is the extreme defocus. The microlens reaches the extreme defocus within an 8° field of view. The defocus amount of the micro-nano structure is positively correlated with the field of view. The defocus amount increases with the increase of the field of view, and the effective defocus amount of the micro-nano structure area is greater.

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