Microchannel and lens array type anti-myopia glasses

Abstract

The present invention discloses a myopia prevention glasses with a microchannel and a lens array. Its manufacturing method includes steps of substrate cleaning, micro-lens array forming, microchannel forming, wet etching process and ultrasonic bath washing. This method uses femtosecond laser technology to prepare a micro-lens array with micron scale and arbitrary morphology on the surface of the substrate, and vertically processes a microchannel structure with high coaxiality corresponding to the micro-lens array on the lower surface of the substrate, which can meet the myopia prevention needs of different patients. It consists of a defocus area formed by a micro-lens array, and then the micro-lens and the microchannel are coupled together. Light passes through different refractive areas and after passing through the microchannel, it is more conducive to focusing the image on the retina of the eye, so that the light incident on the spectacle lens is focused at a position closer to the object than the predetermined position. Among them, the microchannel can eliminate the influence of stray light, thereby suppressing the development of myopia and meeting the different needs of different patients for glasses.

Description

Technical Field

[0001] The present invention relates to the technical field of microfabrication of optical devices, and particularly to a myopia prevention glasses with microchannels and lens arrays. Background Art

[0002] In recent years, myopia has become an important threat to visual health. The prevalence of myopia has increased sharply and shows a trend of getting younger. Once myopia occurs, it is irreversible, and as the degree of myopia increases, the risk of myopia complications increases, which will seriously affect visual health. It has been proven that the method of peripheral defocus can effectively slow down the further development of myopia. There is a defocus area formed by an integrated micro-lens array and microchannels on this type of myopia prevention lens. In this lens, light passes through different refractive regions, and the image is focused on the retina of the eye, so that the light incident on the spectacle lens is focused at a position closer to the object than the predetermined position, thereby inhibiting the development of myopia, where the microchannels act as diaphragms here.

[0003] Therefore, the present invention aims to prepare myopia prevention glasses combining a micro-lens array and microchannels for use in the treatment of myopia, thereby inhibiting the development of myopia. Summary of the Invention

[0004] Aiming at the above problems, the present invention aims to provide a myopia prevention glasses with microchannels and lens arrays, which is a myopia prevention glasses formed on a substrate by femtosecond laser technology and integrated with a micro-lens array and a microchannel structure and can meet the myopia needs of different patients. A defocus area composed of a micro-lens array is prepared on the myopia prevention glasses, and then the micro-lenses and microchannels are coupled together, which can effectively relieve the further development of myopia.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A myopia prevention glasses with microchannels and lens arrays, characterized in that the manufacturing method of the myopia prevention glasses includes the following steps:

[0006] 1) Substrate cleaning: The substrate is selected as plano-convex K9 glass, and the substrate is ultrasonically cleaned in a water bath with acetone, alcohol and deionized water in sequence for 5 minutes to remove impurities on the substrate surface, and then dried for standby;

[0007] 2) Micro-lens array forming: The substrate is fixed on a three-dimensional translation stage of a femtosecond laser, and a femtosecond laser beam with an energy of 3 mW is focused on the substrate surface through an optical focusing lens with NA = 0.5. The movement of the three-dimensional translation stage is controlled by a computer program, so that a spherical micro-lens array is formed on the upper surface of the substrate by the femtosecond laser;

[0008] 3) Microchannel forming: The femtosecond laser focus is focused directly below the spherical micro-lens array to process microchannels;

[0009] 4) Wet etching process: Place the substrate processed by femtosecond laser in a hydrofluoric acid solution for ultrasonic water bath chemical etching. After 60 - 80 minutes of etching, smooth micro-lenses and micro-channels are formed on the surface.

[0010] 5) Ultrasonic bath washing: Sequentially use acetone, alcohol, and deionized water to ultrasonically wash the residues on the surface of the substrate, and finally obtain a clean spectacle lens with single-sided micro-lenses.

[0011] Preferably, the central wavelength of the femtosecond laser used is 800 nm, the pulse width is 50 fs, and the repetition frequency is 1 KHz.

[0012] Preferably, the radius of the spherical micro-lens array is 300 um, the micro-channel is located 500 um directly below the spherical micro-lens array, the radius of the micro-channel is 50 um, and the depth is 300 um.

[0013] Preferably, the spherical micro-lens array and the micro-channel are both vertically corresponding and arranged in a circular pattern. The distance between adjacent two rings is 600 um, the distance between adjacent two ablation points in the same ring is 600 um, and there are two rings in total. The size of the micro-lens array is ensured to be within the range of hundreds of micrometers, the size of the micro-channel is not larger than the diameter of the lens, and the distance between the two is ensured to be within the depth of field of the micro-lens to achieve a clear imaging effect. Beyond the depth of field, there will be problems with non-imaging.

[0014] Preferably, the concentration of the hydrofluoric acid solution is 5% - 10%, and the etching temperature is 20 - 50 °C. Under this etching condition, micro-lenses with good morphology can be obtained. Hydrofluoric acid with different concentrations has different etching rates for the modified area. When the temperature is higher than 50 °C, the surface quality of the etched sample is poor. When the temperature is lower than 20 °C, the etching rate is slow. This temperature range can well control the etching rate and the surface quality after etching.

[0015] The beneficial effects of the present invention are as follows: Femtosecond laser can perform subtractive manufacturing on any material with its ultra-high peak power and has a processing accuracy exceeding the diffraction limit. By adopting the point-by-point scanning method, in addition to preparing millimeter-scale or even larger micro-lenses, micro-lens arrays with micron-scale and arbitrary morphologies can also be prepared, and micro-channel structures with high coaxiality can be processed vertically corresponding to the micro-lens array on the lower surface of the substrate. Furthermore, through wet etching technology, the morphology of the micro-lens array becomes smooth, and an anti-myopia spectacle lens integrated with a micro-lens array and a micro-channel and meeting the myopia needs of different patients is formed.

[0016] A defocus area composed of a microlens array is prepared on an anti-myopia glasses, and then the microlens and the microchannel are coupled together, which can effectively relieve the further development of myopia. In this type of lens, light passes through different refractive areas, and after passing through the microchannel, it is more conducive to focusing the image on the retina of the eye, so that the light incident on the glasses lens is focused at a position closer to the object than the predetermined position. The microchannel will eliminate the influence of stray light, thereby suppressing the development of myopia and meeting the different needs of different patients for glasses.

[0017] Due to the difference in the refractive index of the lens material, the microlens fabricated on one side of the low refractive index lens sometimes cannot reach the preset focal length. However, by the method of the present invention, microlenses can be processed on both sides of the lens, and the focal length can be adjusted within a larger range, so as to meet the preset requirements. Brief Description of the Drawings

[0018] Figure 1 Side view of the base material of the myopia glasses of the present invention.

[0019] Figure 2 Top view of the base material of the myopia glasses of the present invention.

[0020] Figure 3 Side view of the femtosecond laser processing of a single microlens integrated with a single microchannel of the present invention.

[0021] Figure 4 Top view of the femtosecond laser processing of a single microlens integrated with a single microchannel of the present invention.

[0022] Figure 5 Side view of the femtosecond laser processing of multiple microlenses integrated with a microchannel of the present invention.

[0023] Figure 6 Top view of the femtosecond laser processing of multiple microlenses integrated with a microchannel of the present invention.

[0024] Wherein: 1 - base material; 2 - single ablation point of the microlens array; 3 - single ablation point of the microchannel. Detailed Description of the Invention

[0025] In order to enable those of ordinary skill in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Embodiment 1

[0027] The manufacturing method of the microchannel and lens array type anti-myopia glasses includes the following steps:

[0028] 1) Substrate cleaning: The substrate is preferably K9 glass with a plano-convex curved surface. The substrate is ultrasonically bathed and cleaned with acetone, alcohol, and deionized water in sequence for 5 minutes to remove impurities on the substrate surface, and then dried for standby.

[0029] 2) Micro-lens array forming: Fix the substrate on the three-dimensional translation stage of the femtosecond laser. Adjust the central wavelength of the femtosecond laser to 800 nm, the pulse width to 50 fs, the repetition frequency to 1 kHz, and the energy of the femtosecond laser beam with 3 mW is focused on the substrate surface through an optical focusing lens with NA = 0.5. Control the movement of the three-dimensional translation stage through a computer program, so that the femtosecond laser prepares a spherical micro-lens array with a radius of 300 um, a distance of 600 um between adjacent two ablation points, a distance of 600 um between adjacent two rings, and a total of two rings on the upper surface of the substrate. Preferably, a rectangular or hexagonal micro-lens array can also be processed according to needs.

[0030] 3) Micro-channel forming: Focus the femtosecond laser focus 500 um directly below the spherical micro-lens array to process a micro-channel. The radius of the micro-channel is 50 um and the depth is 300 um, and it corresponds vertically to each ablation point of the spherical micro-lens array one by one.

[0031] 4) Wet etching process: Place the substrate processed by the femtosecond laser in a hydrofluoric acid solution with a concentration of 5% and a corrosion temperature of 50 °C, and perform ultrasonic bath chemical corrosion. After 80 minutes of corrosion, smooth micro-lenses and micro-channels are formed on the surface.

[0032] 5) Ultrasonic bath washing: Wash away the residues on the substrate surface, and finally obtain a clean spectacle lens with single-sided micro-lenses.

[0033] Example 2

[0034] Anti-myopia spectacle with micro-channel and lens array, and its manufacturing method includes the following steps:

[0035] 1) Substrate cleaning: The substrate is ultrasonically bathed and cleaned with acetone, alcohol, and deionized water in sequence for 5 minutes to remove impurities on the substrate surface, and then dried for standby.

[0036] 2) Micro-lens array forming: Fix the substrate on the three-dimensional translation stage of the femtosecond laser. Adjust the central wavelength of the femtosecond laser to 800 nm, the pulse width to 50 fs, the repetition frequency to 1 kHz, and the energy of the femtosecond laser beam with 3 mW is focused on the substrate surface through an optical focusing lens with NA = 0.5. Control the movement of the three-dimensional translation stage through a computer program, so that the femtosecond laser prepares a spherical micro-lens array with a radius of 300 um, a distance of 600 um between adjacent two ablation points, a distance of 600 um between adjacent two rings, and a total of two rings on the upper surface of the substrate.

[0037] 3) Microchannel forming: Focus the femtosecond laser focus 500 um directly below the spherical microlens array to fabricate a microchannel with a radius of 50 um and a depth of 300 um, which corresponds vertically to each ablation point of the spherical microlens array.

[0038] 4) Wet etching process: Place the substrate treated with femtosecond laser in a hydrofluoric acid solution with a concentration of 7% and an etching temperature of 35 °C, and perform ultrasonic bath chemical etching. After 60 minutes of etching, smooth-surface microlenses and microchannels are formed.

[0039] 5) Ultrasonic bath washing: Wash away the residues on the substrate surface to finally obtain a clean spectacle lens with single-sided microlenses.

[0040] Example 3

[0041] For the myopia-preventing spectacle with microchannels and lens arrays, its manufacturing method includes the following steps:

[0042] 1) Substrate cleaning: Sequentially use acetone, alcohol, and deionized water to ultrasonically bath clean the substrate for 5 minutes to remove impurities on the substrate surface, and dry it for standby.

[0043] 2) Microlens array forming: Fix the substrate on the three-dimensional translation stage of the femtosecond laser, adjust the central wavelength of the femtosecond laser to 800 nm, the pulse width to 50 fs, the repetition frequency to 1 kHz, and focus the femtosecond laser beam with an energy of 3 mW onto the substrate surface through an optical focusing lens with NA = 0.5. Control the movement of the three-dimensional translation stage through a computer program to fabricate a spherical microlens array with a radius of 300 um on the upper surface of the substrate, where the distance between adjacent two ablation points is 600 um, the distance between adjacent two rings is 600 um, and there are two rings in total.

[0044] 3) Microchannel forming: Focus the femtosecond laser focus 500 um directly below the spherical microlens array to fabricate a microchannel with a radius of 50 um and a depth of 300 um, which corresponds vertically to each ablation point of the spherical microlens array.

[0045] 4) Wet etching process: Place the substrate treated with femtosecond laser in a hydrofluoric acid solution with a concentration of 10% and an etching temperature of 20 °C, and perform ultrasonic bath chemical etching. After 70 minutes of etching, smooth-surface microlenses and microchannels are formed.

[0046] 5) Ultrasonic bath washing: Wash away the residues on the substrate surface to finally obtain a clean spectacle lens with single-sided microlenses.

[0047] The principle of the present invention is as follows: An anti-myopia glasses integrated with a microlens array and a microchannel structure and capable of meeting the myopia needs of different patients is formed on a substrate through femtosecond laser technology. A defocusing area composed of the microlens array is prepared on the anti-myopia glasses, and then the microlens and the microchannel are coupled together, which can effectively alleviate the further development of myopia.

[0048] The annular microlenses distributed on the lens play the effect of peripheral defocusing, focusing the image on the retina of the eye so that the light incident on the spectacle lens is focused at a position closer to the object than the predetermined position, thereby suppressing the development of myopia. Among them, the microchannel plays the role of a diaphragm here to reduce the influence of stray light.

[0049] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. The anti-myopia glasses with a microchannel and a lens array are characterized in that The manufacturing method of the anti-myopia glasses comprises the following steps: 1) Substrate cleaning: The substrate is made of plano-convex K9 glass. The substrate is ultrasonically bathed and cleaned with acetone, alcohol, and deionized water in sequence for 5 minutes to remove the impurities on the substrate surface, and then dried for standby. 2) Micro-lens array forming: The substrate is fixed on the three-dimensional translation stage of the femtosecond laser. The femtosecond laser beam with an energy of 3 mW is focused on the substrate surface through an optical focusing lens with NA = 0.

5. The movement of the three-dimensional translation stage is controlled by a computer program to fabricate a spherical micro-lens array on the upper surface of the substrate with the femtosecond laser. 3) Micro-channel forming: The femtosecond laser focusing point is focused directly below the spherical micro-lens array to machine a micro-channel. 4) Wet etching process: The substrate processed by the femtosecond laser is placed in a hydrofluoric acid solution for ultrasonic bath chemical etching. After etching for 60 - 80 minutes, smooth micro-lenses and micro-channels are formed on the surface. 5) Ultrasonic bath washing: The residues on the substrate surface are ultrasonically bathed and washed with acetone, alcohol, and deionized water in sequence, and finally a clean spectacle lens with single-sided micro-lenses is obtained. The central wavelength of the femtosecond laser used is 800 nm, the pulse width is 50 fs, and the repetition frequency is 1 KHz. The radius of the spherical micro-lens array is 300 μm. The micro-channel is located 500 μm directly below the spherical micro-lens array. The radius of the micro-channel is 50 μm and the depth is 300 μm. Both the spherical micro-lens array and the micro-channel are vertically corresponding and arranged in a circular pattern. The distance between two adjacent rings is 600 μm, the distance between two adjacent ablation points in the same ring is 600 μm, and there are two rings arranged in total.

2. The microchannel and lens array type myopia prevention glasses according to claim 1, characterized in that: The concentration of the hydrofluoric acid solution is 5% - 10%, and the etching temperature is 20 - 50 °C.

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