A multi-point defocusing lens
By designing an optical resin base layer, a reflective layer, an anti-fouling layer, and a wear-resistant layer on the lens, and embedding a honeycomb microlens array, the problems of large light transmittance loss and performance imbalance of the lens are solved, achieving high light transmittance, anti-fouling and wear resistance, while slowing down the growth of the axial length of the eye and improving wearing comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGCHUN EYE POWER TECH CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-30
AI Technical Summary
Existing multi-layered composite lens structures improve performance but suffer significant light transmittance loss, and require a balance between stain resistance and abrasion resistance. The reflective layer interferes with the optical path, affecting the effect of the defocus lens.
The substrate is made of optical resin or glass, and the surface is covered with a reflective layer, an anti-fouling layer and a wear-resistant layer. It has an embedded honeycomb microlens array with a density of ≥500 lenses/cm2. The defocusing amount increases gradually from the center to the edge. The composite functional layer is formed by magnetron sputtering, sol-gel method and vacuum evaporation process, and the defocusing structure layer is prepared by nanoimprint technology.
It achieves high light transmittance (≥95%), the anti-fouling layer decomposes organic stains under ultraviolet light, the wear-resistant layer has high hardness, the honeycomb microlens array covers an increased field of view, reduces glare interference, slows down axial elongation, and improves wearing comfort.
Smart Images
Figure CN224436709U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lens technology, and in particular to a multi-point defocus lens. Background Technology
[0002] Myopia is a common visual problem, also known as shortness of vision. One of the clinically proven effective ways to control the progression of myopia is to control the growth of the eye axis by defocusing, thereby slowing down the progression of myopia.
[0003] A search revealed that existing technology discloses a curve-gradient multi-point defocus myopia control lens (announcement number: CN220509230U), which includes a substrate layer, a hardening layer at the upper end of the substrate layer, a tone layer at the upper end of the hardening layer, an anti-reflective layer at the upper end of the tone layer, an anti-fouling layer at the upper end of the anti-reflective layer, a refractive correction zone at the center of the substrate layer, an intervention zone at the outer side of the refractive correction zone, a microconvex lens at the upper end of the substrate layer, and a defocus zone at the outer side of the intervention zone.
[0004] In existing technologies, in order to improve the performance of lenses, multi-layer structures are usually required. The coating has a single function, and the anti-fouling and anti-abrasion properties need to be balanced. The reflective layer interferes with the optical path, resulting in a large loss of light transmittance and affecting the performance of the defocus lens. There is room for optimization.
[0005] Therefore, we propose a multi-point defocus lens. Utility Model Content
[0006] The present invention mainly addresses the technical problem of the need for balanced lens performance and large light transmission loss by providing a multi-point defocus lens.
[0007] To achieve the above objectives, this utility model adopts the following technical solution: a multi-point defocusing lens, comprising:
[0008] The base layer, made of optical resin or glass, serves as the main body of the lens.
[0009] A composite functional layer covers the surface of the base layer, including a reflective layer, an anti-fouling layer, and a wear-resistant layer arranged sequentially.
[0010] A defocusing structure layer, embedded in a base layer or composite functional layer, includes a honeycomb microlens array arranged in a honeycomb pattern, wherein the density of the honeycomb microlens array is ≥500 microlenses / cm². 2 The defocusing amount increases gradually from the center of the lens to the edge.
[0011] In a preferred embodiment of this invention, the reflective layer is a TiO2 / SiO2 dielectric film, consisting of 5 alternately stacked TiO2 and SiO2 thin films, with a total thickness of 625nm ± 5nm.
[0012] In a preferred embodiment of this invention, the anti-fouling layer is a photocatalytic TiO2 coating with a thickness of 20nm±2nm.
[0013] In a preferred embodiment of this invention, the wear-resistant layer is a nano-SiO2 coating with a thickness of 80nm±5nm and a pencil hardness ≥9H.
[0014] In a preferred embodiment of this utility model, the radius of curvature of the honeycomb microlens array is 10μm±1μm, the defocusing amount in the central region is +1.00D, and the defocusing amount in the edge region is +3.00D.
[0015] The lens has a light transmittance of ≥95%, a wavelength of 400-700nm, and a scratch depth of ≤5μm after abrasion resistance testing.
[0016] In a preferred embodiment of this utility model, the base layer is made of optical resin with a refractive index of 1.67 and a thickness of 2.0 mm ± 0.1 mm.
[0017] In a preferred embodiment of this invention, the composite functional layer is formed by sequential deposition of magnetron sputtering, sol-gel method and vacuum evaporation process.
[0018] As a preferred embodiment of this invention, the defocused structure layer is prepared by nanoimprinting technology with an imprinting accuracy of ±1μm.
[0019] This invention provides a multi-point defocusing lens. It has the following beneficial effects:
[0020] 1. This multi-point defocusing lens, through the TiO2 coating in the anti-fouling layer, can decompose more than 95% of organic stains (such as fingerprints and grease) under ultraviolet light irradiation. After 1000 wiping tests, the light transmittance decreases. The nano-SiO2 coating has a hardness of 9H (pencil hardness) and excellent scratch resistance. Through plasma pretreatment, the composite functional layer has high adhesion to the base layer, and it is not easy to delaminate even under large temperature differences. The composite layer solves the problems of anti-fouling and anti-scratch, and achieves synergy of multi-functional composite coating with excellent performance.
[0021] 2. This multi-point defocus lens increases the density of the honeycomb microlens array, thereby improving the coverage of the field of view and ensuring that the defocus signal can still be received when the human eye rotates. This effectively slows down the growth of the axial length. The defocus amount in the central area is +1.00D, and it increases to +3.00D in the peripheral area. This matches the accommodation characteristics of the human eye and reduces compensatory growth of the axial length caused by accommodation lag.
[0022] 3. This multi-point defocus lens reduces the reflectivity of the lens surface through a dielectric film reflective layer, significantly reducing glare interference. It has high overall light transmittance, ensuring sufficient light enters the eye and avoiding eye fatigue caused by insufficient light transmittance. The base layer uses a 1.67 refractive index resin, which effectively suppresses visual blurring caused by dispersion and improves wearing comfort. Attached Figure Description
[0023] Figure 1 This is a perspective view of the entire utility model;
[0024] Figure 2 This is a front view of the present invention.
[0025] Figure 3 This is a cross-sectional view of the entire utility model;
[0026] Figure 4 This is a three-dimensional view of the defocusing structure layer of this utility model;
[0027] Figure 5 This is a cross-sectional view of the composite functional layer of this utility model.
[0028] Legend: 10. Base layer; 20. Defocus structure layer; 21. Honeycomb microlens array; 30. Composite functional layer; 31. Reflective layer; 32. Anti-fouling layer; 23. Wear-resistant layer. Detailed Implementation
[0029] A type of multi-point defocusing lens, such as Figure 1 As shown, it includes:
[0030] Base layer 10, made of optical resin or glass, serves as the main body of the lens;
[0031] A composite functional layer 30 covers the surface of the base layer 10 and includes a reflective layer 31, an anti-fouling layer 32, and a wear-resistant layer 23 arranged sequentially.
[0032] The defocusing structure layer 20, embedded in the base layer 10 or the composite functional layer 30, includes a honeycomb microlens array 21 arranged in a honeycomb pattern, wherein the density of the honeycomb microlens array 21 is ≥500 microlenses / cm². 2 The defocusing amount increases gradually from the center of the lens to the edge.
[0033] The reflective layer 31 is a TiO2 / SiO2 dielectric film, which is composed of 5 layers of alternately stacked TiO2 and SiO2 thin films with a total thickness of 625nm±5nm;
[0034] The anti-fouling layer 32 is a photocatalytic TiO2 coating with a thickness of 20nm±2nm, which can decompose stains under ultraviolet light;
[0035] The wear-resistant layer 23 is a nano-SiO2 coating with a thickness of 80nm±5nm and a pencil hardness ≥9H.
[0036] The radius of curvature of the honeycomb microlens array 21 is 10μm±1μm, and the defocusing amount is +1.00D in the central region and +3.00D in the edge region;
[0037] The lens has a light transmittance of ≥95% (wavelength 400-700nm) and a scratch depth of ≤5μm after abrasion resistance testing.
[0038] The base layer 10 is made of optical resin with a refractive index of 1.67 and a thickness of 2.0 mm ± 0.1 mm. The base layer 10 is injection molded, and the surface of the base layer 10 is treated with plasma to ensure interlayer bonding.
[0039] The composite functional layer 30 is formed by sequential deposition of magnetron sputtering, sol-gel method and vacuum evaporation process.
[0040] The defocused structure layer 20 is prepared by nanoimprint technology with an imprinting accuracy of ±1μm.
[0041] Through the design of the above scheme, the entire lens is configured to have:
[0042] Synergistic design of composite functional layer and defocus structure layer;
[0043] Optical optimization of high-density microlens arrays and gradient defocus;
[0044] It exhibits excellent performance, including the functional integration of the photocatalytic antifouling layer and the dielectric film reflective layer.
[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A multi-point defocusing lens, characterized in that, include: The base layer (10), made of optical resin or glass, serves as the lens body; A composite functional layer (30) covers the surface of the base layer (10) and includes a reflective layer (31), an anti-fouling layer (32) and a wear-resistant layer (23) arranged sequentially. A defocusing structure layer (20), embedded in a base layer (10) or a composite functional layer (30), includes a honeycomb microlens array (21) arranged in a honeycomb pattern, wherein the density of the honeycomb microlens array (21) is ≥500 per cm. 2 The defocusing amount increases gradually from the center of the lens to the edge.
2. The multi-point defocus lens according to claim 1, characterized in that: The reflective layer (31) is a TiO2 / SiO2 dielectric film, which consists of 5 layers of alternately stacked TiO2 and SiO2 thin films with a total thickness of 625nm±5nm.
3. The multi-point defocus lens according to claim 1, characterized in that: The anti-fouling layer (32) is a photocatalytic TiO2 coating with a thickness of 20nm±2nm.
4. The multi-point defocus lens according to claim 1, characterized in that: The wear-resistant layer (23) is a nano-SiO2 coating with a thickness of 80nm±5nm and a pencil hardness ≥9H.
5. The multi-point defocus lens according to claim 1, characterized in that: The radius of curvature of the honeycomb microlens array (21) is 10μm±1μm, the defocusing amount is +1.00D in the central region and +3.00D in the edge region; The lens has a light transmittance of ≥95%, a wavelength of 400-700nm, and a scratch depth of ≤5μm after abrasion resistance testing.
6. The multi-point defocus lens according to claim 1, characterized in that: The base layer (10) is made of optical resin with a refractive index of 1.67 and a thickness of 2.0 mm ± 0.1 mm.
7. The multi-point defocus lens according to claim 1, characterized in that: The composite functional layer (30) is formed by sequential deposition of magnetron sputtering, sol-gel method and vacuum evaporation process.
8. The multi-point defocus lens according to claim 1, characterized in that: The defocused structure layer (20) is prepared by nanoimprinting technology with an imprinting accuracy of ±1μm.