Multifocal Fresnel glasses with myopia treatment and correction functions and manufacturing method thereof

Abstract

The present invention discloses a multifocal Fresnel glasses with the function of treating and correcting myopia and a manufacturing method thereof, comprising a plane material, an inner circle curved surface, an outer circle curved surface and an intermediate transition curved surface are provided on the plane material, a plurality of inner circle annular structures are provided on the inner circle curved surface at intervals, a plurality of outer circle annular structures are provided on the outer circle curved surface at intervals, a plurality of intermediate annular structures are provided on the intermediate transition curved surface at intervals, the inner circle curved surface can correct myopia, and the outer circle curved surface can treat myopia. The present invention integrates the design concept and design principle of the treatment and correction functions into one Fresnel lens, utilizes the special annular structure of the Fresnel lens, separates the ordinary lens curved surface into a plurality of equal thickness sections, can greatly reduce the thickness of the lens, especially for patients with high myopia, the glasses can greatly increase the wearing comfort.

Description

Technical Field

[0001] The invention relates to glasses, in particular to multi-focal Fresnel glasses with the function of treating and correcting myopia and a manufacturing method thereof. Background Art

[0002] At present, ordinary myopia glasses only provide the clearest correction for objects within the ±5° field of view, and the corrected light is projected onto the center of the retina. However, as the viewing angle changes, the area where the object is projected onto the retina is also different. The light received by the retina far from the center is not focused on the retina. Figure 2 This stimulates the retina to move backwards, causing the eye axis to lengthen and myopia to deepen. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a multifocal Fresnel glasses with the function of treating and correcting myopia and a method for manufacturing the same. The main purpose of the present invention is to solve the problem of ordinary myopia glasses stimulating the retina to develop backwards while completing the correction of ordinary glasses for the imaging of objects within the ±5° field of view, so as to achieve the multifunctional characteristics of combining treatment and correction.

[0004] The objective of the present invention is achieved through the following technical solution: a multifocal Fresnel glasses with the function of treating and correcting myopia, comprising a planar material, on which an inner circle curved surface, an outer circle curved surface and an intermediate transition curved surface are provided, a plurality of inner circle annular structures are arranged at intervals on the inner circle curved surface, a plurality of outer circle annular structures are arranged at intervals on the outer circle curved surface, a plurality of intermediate annular structures are arranged at intervals on the intermediate transition curved surface, the inner circle curved surface can correct myopia, the outer circle curved surface can treat myopia, the surface parameters and refractive powers of the inner circle curved surface, the outer circle curved surface and the intermediate transition curved surface are all different, the curvature radius of the inner circle curved surface is greater than the curvature radius of the intermediate transition curved surface, and the curvature radius of the outer circle curved surface is smaller than the curvature radius of the intermediate transition curved surface.

[0005] As an improvement of the multifocal Fresnel glasses with the function of treating and correcting myopia and the manufacturing method thereof of the present invention, the inner ring structure, the outer ring structure and the middle ring structure are all formed by multiple equal-thickness sections distributed in a ring shape from the inside to the outside on the planar material, and the sections are formed by splitting the curved surface shape of an ordinary lens.

[0006] As an improvement of the multifocal Fresnel glasses with the function of treating and correcting myopia and the manufacturing method thereof of the present invention, the cross-sectional surface shape of the inner ring structure is different from the cross-sectional surface shape of the outer ring structure.

[0007] As an improvement of the multifocal Fresnel glasses with the function of treating and correcting myopia and the manufacturing method thereof of the present invention, the heights of the inner ring structure, the outer ring structure and the middle ring structure are less than 5 microns.

[0008] As an improvement of the multifocal Fresnel glasses with the function of treating and correcting myopia and the manufacturing method thereof of the present invention, the minimum spacing between two adjacent inner ring structures does not exceed 10 microns, the minimum spacing between two adjacent outer ring structures does not exceed 10 microns, and the minimum spacing between two adjacent middle ring structures does not exceed 10 microns.

[0009] As an improvement of the multifocal Fresnel glasses with the function of treating and correcting myopia and the manufacturing method thereof of the present invention, the thickness of the planar material does not exceed 5 microns, and the planar material is organic glass.

[0010] As an improvement of the multifocal Fresnel glasses with the function of treating and correcting myopia and the manufacturing method thereof of the present invention, the ordinary lens is a concave lens, and the surface shape of the concave lens adopts an even-order aspherical surface.

[0011] Another object of the present invention is to provide a method for manufacturing multifocal Fresnel glasses, comprising the following steps:

[0012] S1: Spin-coat the photoresist onto the silicon wafer.

[0013] S2: Pre-baking: placing the silicon wafer on a heating plate to soft-bake the photoresist so that the photoresist has a certain hardness;

[0014] S3: Exposure, using laser direct writing equipment to expose the photoresist, and the exposure depth can be controlled by adjusting the exposure power;

[0015] S4: Development. After the exposure is completed, the photoresist is developed to obtain a ring structure of the lens. The ring structure is distributed in three different areas of the silicon wafer, namely, an inner ring area, a middle transition area, and an outer ring area. The curvature radii of the inner ring area, the middle transition area, and the outer ring area are all different.

[0016] S5: post-drying, hard drying the product of step S4 to obtain a lens mold for nanoimprinting;

[0017] S6: Transferring: using nanoimprinting equipment, the lens structure on the mold is transferred to the organic glass (PMMA), and the lens is obtained after demolding.

[0018] As an improvement of the multifocal Fresnel glasses and the manufacturing method thereof of the present invention, the photoresist in step S1 is selected as S1818 photoresist, and the photoresist film thickness after the coating is completed is 2.5 microns, and the laser exposure dose in step S3 is 1276 μJ / mm 2 , exposure resolution 300nm, scanning speed 200mm / s, development in step S4 adopts spray development, and the development time is selected as 35s according to the photoresist film thickness of 2.5 microns.

[0019] As an improvement of the multifocal Fresnel glasses and the manufacturing method thereof of the present invention, the temperature of the heating plate for pre-drying is 110° C., the time for pre-drying is 1 minute, the temperature of the heating plate for post-drying is 110° C., the time for post-drying is 30 seconds, and the transfer in step S6 uses organic glass (PMMA) as the transfer substrate, which can directly form lenses and facilitate large-scale manufacturing.

[0020] The beneficial effects of the present invention are as follows: the present invention integrates the design concept and design principle of treatment and correction functions into one Fresnel lens, and utilizes the special annular structure of the Fresnel lens to separate the ordinary lens surface into multiple equal-thickness sections, which can greatly reduce the thickness of the lens. In particular, for patients with high myopia, the glasses can greatly increase the wearing comfort. In addition, the Fresnel lens can split multiple curved surfaces into different areas on the same plane to achieve inner circle correction and outer circle treatment, so that one pair of glasses can not only meet the daily vision needs of myopic patients, but also stop the increase of myopia or even reduce it. At the same time, the lens is manufactured through the high-precision characteristics of laser direct writing and nano-imprinting technology, which can well improve the problem of Fresnel lenses reducing visual acuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of ray tracing of ordinary glasses;

[0022] Figure 2 The size and shape of the light spot on the retina when ordinary glasses project light at 0°, 7.5°, 15° and 25° respectively. It can be seen that the larger the angle, the larger the radius of the light spot on the retina, and the more obvious the coma;

[0023] Figure 3 It is a multifunctional Fresnel lens embodiment;

[0024] Figure 4 This is a schematic diagram of the light tracking of the lens of the present invention;

[0025] Figure 5 The size and shape of the light spot on the retina when the multifunctional lens projects 0°, 7.5°, 15° and 25° light respectively. Compared with ordinary glasses, the radius of the light spot becomes smaller and the coma aberration is significantly improved;

[0026] Figure 6 Schematic diagram of the multifunctional lens manufacturing method based on high-precision laser direct writing and nanoimprinting technology;

[0027] The accompanying drawings are marked as follows: DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] like Figure 3-Figure 5As shown, a multifocal Fresnel glasses with the function of treating and correcting myopia comprises a plane material, on which an inner circle curved surface 1, an outer circle curved surface 2 and an intermediate transition curved surface 3 are arranged, a plurality of inner circle annular structures 4 are arranged at intervals on the inner circle curved surface 1, a plurality of outer circle annular structures 5 are arranged at intervals on the outer circle curved surface 2, and a plurality of intermediate annular structures 6 are arranged at intervals on the intermediate transition curved surface 3. The inner circle curved surface 1 can correct myopia, and the outer circle curved surface 2 can treat myopia. The surface shape parameters and refractive powers of the inner circle curved surface 1, the outer circle curved surface 2 and the intermediate transition curved surface 3 are all different. The curvature radius of the inner circle curved surface 1 is greater than the curvature radius of the intermediate transition curved surface 3, and the curvature radius of the outer circle curved surface 2 is smaller than the curvature radius of the intermediate transition curved surface 3. Three different annular areas are distributed from the inside to the outside, namely, the inner circle corrected vision area, the middle transition area and the outer circle therapeutic vision area. The surface shape parameters and refractive powers of different areas are different. The inner circle is responsible for correcting vision, and the outer circle is responsible for treating myopia. The entire lens is divided into three different annular areas from the inside to the outside, namely the inner circle corrected vision area, the middle transition area and the outer circle therapeutic vision area. Different areas have different surface parameters and refractive powers. The inner circle is responsible for correcting vision and projects light within the ±5° field of view onto the retina. It has the largest radius of curvature. The outer circle is responsible for treating myopia and projects light with a viewing angle greater than 7.5° onto the retina or in front of the retina to inhibit the retina from developing backwards and stimulate it to develop forward to achieve the purpose of treating myopia. It has the smallest radius of curvature. The transition area projects light from ±5° to ±7.5° onto the retina to increase visual comfort. The radius of curvature is between the correction area and the treatment area. Figure 4 As shown, the light spot effect on the retina is as follows Figure 5 shown.

[0032] Preferably, the inner ring structure 4, the outer ring structure 5 and the middle ring structure 6 are formed by a plurality of equal-thickness sections distributed in a ring shape from the inside to the outside on a plane material, and the sections are formed by splitting the curved surface of an ordinary lens. The lenses of the multifunctional glasses adopt the annular structure of the Fresnel lens, splitting the concave lens into equal-thickness sections and distributing them on the plane from the inside to the outside, which can greatly reduce the thickness of the lenses and improve the wearing comfort.

[0033] Preferably, the cross-sectional surface shape of the inner ring structure 4 is different from the cross-sectional surface shape of the outer ring structure 2 .

[0034] Preferably, the height of the inner ring structure 4, the outer ring structure 5 and the middle ring structure 6 is less than 5 microns. In order to improve the problem that the annular grooves of the Fresnel lens itself affect light transmission and reduce visual acuity, reducing the height of the annular belt to less than 5 microns can greatly improve this problem.

[0035] Preferably, the minimum spacing between two adjacent inner ring structures 4 does not exceed 10 microns, the minimum spacing between two adjacent outer ring structures 5 does not exceed 10 microns, and the minimum spacing between two adjacent middle ring structures 6 does not exceed 10 microns.

[0036] Preferably, the thickness of the planar material does not exceed 5 micrometers, and the planar material is organic glass.

[0037] Preferably, the ordinary lens is a concave lens, and the surface shape of the concave lens is an even-order aspheric surface.

[0038] like Figure 6 As shown, a method for manufacturing multifocal Fresnel glasses uses a manufacturing method combining high-precision laser direct writing technology and nano-imprinting technology to ensure the manufacturing accuracy of the micron-nano lens structure. The method includes the following steps:

[0039] S1: Spin coating the photoresist on the silicon wafer. The photoresist is S1818 photoresist. The photoresist is spin coated in two stages. The thickness of the photoresist film after coating is 2.5 microns.

[0040] S2: Pre-baking: placing the silicon wafer on a heating plate to soft-bake the photoresist so that the photoresist has a certain hardness; the temperature of the pre-baking heating plate is 110°C, and the pre-baking time is 1 minute;

[0041] S3: Exposure, using laser direct writing equipment to expose the photoresist. The exposure depth can be controlled by adjusting the exposure power; laser exposure dose 1276μJ / mm 2 , exposure resolution 300nm, scanning speed 200mm / s; using the variable dose exposure of laser direct writing technology, the designed three-dimensional ring-shaped structure of the lens is photolithographically processed into the photoresist film layer; laser direct writing is one of the main technologies for making diffractive optical elements, and can directly write multi-step, continuous phase relief microstructures on the surface of the photoresist. Laser direct writing is to use a laser beam with variable intensity to perform variable dose exposure on the resist material on the surface of the substrate, and form the required relief contour on the surface of the resist layer after development. The basic working principle of the laser direct writing system is to control the high-precision laser beam scanning by a computer, directly expose and write any designed pattern on the photoresist, and then directly transfer the designed pattern to the mask.

[0042] S4: Development. After the exposure is completed, the photoresist is developed to obtain a ring structure of the lens. The ring structure is distributed in three different areas of the silicon wafer, namely, the inner ring area, the middle transition area and the outer ring area. The curvature radii of the inner ring area, the middle transition area and the outer ring area are all different. The development is carried out by spray development. According to the thickness of the photoresist film of 2.5 microns, the development time is selected as 35 seconds.

[0043] S5: post-drying, hard drying the product of step S4 to obtain a lens mold for nanoimprinting; the temperature of the heating plate for post-drying is 110° C., and the time for post-drying is 30 seconds;

[0044] S6: Transfer, using nanoimprint equipment, transfer the lens structure on the mold to organic glass (PMMA), and the lens is obtained after demolding. Transfer uses organic glass (PMMA) as the transfer substrate, which can directly form the lens and facilitate large-scale manufacturing. Nanoimprint technology is a new type of micro-nano processing technology. This technology achieves ultra-high resolution through mechanical transfer. Since the processing process of nanoimprint technology does not use visible light or ultraviolet light to process patterns, but uses mechanical means to transfer patterns, this method can achieve very high resolution. The highest resolution can reach 2 nanometers. In addition, the template can be used repeatedly, which undoubtedly greatly reduces the processing cost and effectively shortens the processing time. Therefore, nanoimprint technology has the technical advantages of ultra-high resolution, easy mass production, low cost, and high consistency.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and structure of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifocal Fresnel glasses with the function of treating and correcting myopia, characterized in that: The invention comprises a planar material, wherein the planar material is provided with an inner circle curved surface, an outer circle curved surface and an intermediate transition curved surface, wherein a plurality of inner circle annular structures are arranged at intervals on the inner circle curved surface, a plurality of outer circle annular structures are arranged at intervals on the outer circle curved surface, a plurality of intermediate annular structures are arranged at intervals on the intermediate transition curved surface, the inner circle curved surface can correct myopia, the outer circle curved surface can treat myopia, the surface shape parameters and refractive powers of the inner circle curved surface, the outer circle curved surface and the intermediate transition curved surface are different, the curvature radius of the inner circle curved surface is greater than the curvature radius of the intermediate transition curved surface, and the curvature radius of the outer circle curved surface is smaller than the curvature radius of the intermediate transition curved surface; The inner ring structure, the outer ring structure and the middle ring structure are all formed by a plurality of sections of equal thickness distributed in a ring shape from the inside to the outside on the planar material, and the sections are formed by splitting the curved surface of an ordinary lens; the cross-sectional surface shape on the inner ring structure is different from the cross-sectional surface shape on the outer ring structure; the heights of the inner ring structure, the outer ring structure and the middle ring structure are less than 5 microns; the minimum spacing between two adjacent inner ring structures does not exceed 10 microns, the minimum spacing between two adjacent outer ring structures does not exceed 10 microns, and the minimum spacing between two adjacent middle ring structures does not exceed 10 microns.

2. The multifocal Fresnel glasses with the function of treating and correcting myopia according to claim 1, characterized in that: The thickness of the planar material does not exceed 5 micrometers, and the planar material is organic glass.

3. The multifocal Fresnel glasses with the function of treating and correcting myopia according to claim 1, characterized in that: The ordinary lens is a concave lens, and the surface shape of the concave lens is an even-order aspheric surface.

4. A method for manufacturing multifocal Fresnel glasses, characterized in that: The following steps are involved: S1: Spin coating the photoresist on the silicon wafer. The photoresist in step S1 is S1818 photoresist, and the coating is performed in two stages. The thickness of the photoresist film after the coating is completed is 2.5 microns. S2: Pre-baking: placing the silicon wafer on a heating plate to soft-bake the photoresist so that the photoresist has a certain hardness; the temperature of the pre-baking heating plate is 110° C., and the pre-baking time is 1 minute; S3: Exposure: Use laser direct writing equipment to expose the photoresist. The exposure depth can be controlled by adjusting the exposure power. The laser exposure dose in step S3 is 1276 μJ / mm 2 , exposure resolution 300nm, scanning speed 200mm / s; S4: Development: after the exposure is completed, the photoresist is developed to obtain a ring-shaped structure of the lens; The ring structure is distributed in three different areas of the silicon wafer, the three different areas are the inner ring area, the middle transition area and the outer ring area, and the curvature radius of the inner ring area, the middle transition area and the outer ring area are all different; the development in step S4 adopts spray development, and the development time is selected as 35s according to the photoresist film thickness of 2.5 microns; S5: post-drying, hard drying the product of step S4 to obtain a lens mold for nanoimprinting; the temperature of the heating plate for post-drying is 110° C., and the time for post-drying is 30 seconds; S6: Transfer, using nanoimprint equipment, transfer the lens structure on the mold to organic glass (PMMA), and obtain the lens after demolding; the transfer in step S6 uses organic glass (PMMA) as the transfer substrate, which can directly shape the lens and facilitate large-scale manufacturing.

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