WO2024169119A1

WO2024169119A1 - Ultra-thin lens and glasses comprising same

Info

Publication number: WO2024169119A1
Application number: PCT/CN2023/106938
Authority: WO
Inventors: 陈冠南; 丁毅; 黄荣湖
Original assignee: 阿尔玻科技有限公司
Priority date: 2023-02-17
Filing date: 2023-07-12
Publication date: 2024-08-22
Also published as: CN116149081A

Abstract

An ultra-thin lens (100), comprising a lens substrate (1), wherein the lens substrate (1) is provided with a first surface (11) and a second surface (12), which are arranged opposite each other, the first surface (11) comprising a plurality of concentric rings (13), centers of the plurality of concentric rings (13) coinciding with the center of the first surface (11), diameters of the plurality of concentric rings (13) being gradually increased outwards from the center of the first surface (11), the plurality of concentric rings being distributed on the first surface (11), and steps (14) being formed between adjacent concentric rings (13) in the thickness direction of the lens substrate (1); and the ultra-thin lens (100) further comprises a coating layer (2) uniformly coating the first surface (11), the coating layer (2) being capable of being made of materials with different refractive indexes n, and the coating layer (2) with different refractive indexes n being capable of producing the ultra-thin lens (100) with different diopter values D, and a diopter value D of the ultra-thin lens (100) satisfying: -20D - 0.0D or 0.0D - 20D.

Description

Ultra-thin lens and glasses containing the same

Citation of Related Applications

This disclosure claims all rights and interests in the Chinese invention patent application with application number 202310175515.4 filed with the State Intellectual Property Office of the People's Republic of China on February 17, 2023, entitled "ULTRA-THIN LENS AND GLASSES INCLUDING THE SAME", and incorporates and discloses its entire contents by reference.

field

The present disclosure generally relates to the field of eyeglass lenses, and more particularly to ultra-thin lenses and eyeglasses including the ultra-thin lenses.

background

With the development of society, the popularization of consumer electronic products and the heavy academic pressure of primary and secondary school students, the visual impairment problem of the elderly due to presbyopia, the myopia rate of primary school students has been rising year by year, and the age is getting younger and younger, the life impairment of the elderly due to presbyopia, caring for the myopia problem of young people and the presbyopia problem of the elderly has become the most prominent humanistic care issue in our country, and has received widespread attention from all walks of life. Therefore, there is a need for a lens that can effectively prevent myopia or presbyopia.

Some spectacle lenses or VR lenses on the market that can inhibit the growth of myopia or presbyopia, whether they are ordinary concave lenses for myopia or convex lenses for presbyopia or VR lenses made of resin lenses, glass lenses or other materials, are characterized by the higher the degree, the thicker the lenses. When the lenses are assembled with spectacle frames, the glasses formed also become heavier as the degree increases, which increases the fatigue caused by teenagers and the elderly when using glasses.

Overview

In one aspect, the present disclosure relates to an ultra-thin lens, the ultra-thin lens comprising a lens substrate; the lens substrate having a first surface and a second surface arranged opposite to each other, the first surface comprising a plurality of concentric rings, the centers of the plurality of concentric rings coinciding with the center of the first surface; the diameters of the plurality of concentric rings increasing outward from the center of the first surface, and being distributed on the first surface, the diameters of the plurality of concentric rings increasing along the thickness direction of the lens substrate between adjacent concentric rings Forming steps;

The ultra-thin lens also includes a coating layer uniformly coated on the first surface. The coating layer can be made of materials with different refractive indices n. Coating layers with different refractive indices n can produce ultra-thin lenses with different refractive diopter values D. The refractive diopter value D of the ultra-thin lens satisfies: -20D∽0.0D, or 0.0D∽20D.

In certain embodiments, the first surface comprises a plurality of concentric rings arranged in a Fresnel structure.

In certain embodiments, the coating layer completely adheres to the object-side surface having the Fresnel structure and uniformly fills the steps of the Fresnel structure, and the steps have the same height along the thickness direction of the lens base layer.

In some embodiments, the Fresnel structure is configured as a spherical surface or an aspherical surface.

In certain embodiments, the second surface of the lens substrate is designed to be a plane or a free-form surface.

In certain embodiments, when the refractive power of the ultra-thin lens satisfies: -20D∽0.0D, the focal length of the lens base layer EFL satisfies: 20mm<EFL<60mm, and the refractive index n of the coating layer satisfies: 1.3<n<1.9; when the refractive power of the ultra-thin lens satisfies: 0.0D∽+20D, the focal length EFL of the lens base layer satisfies: -60mm<EFL<-20mm, and the refractive index n of the coating layer satisfies: 1.4<n<1.9.

In certain embodiments, the refractive index of the coating layer and the refractive index n0 of the lens base layer 1 satisfy the following relationship: 0.81<n/n0<1.36.

In certain embodiments, the second surface of the lens substrate may be configured with different curvature radii R2. Ultra-thin lenses with different refractive power values D may be produced by changing the curvature radius R2 of the second surface.

In certain embodiments, the coating layer and the lens substrate are coupled to form a plano lens or a plano-convex lens or a plano-concave lens.

In certain embodiments, the coating layer includes UV glue.

In certain embodiments, the coating layer and the lens substrate have coefficients of thermal expansion that match.

In another aspect, the present disclosure relates to eyeglasses comprising the ultra-thin lenses described in the present disclosure.

In certain embodiments, the glasses include myopia glasses, reading glasses, or VR glasses. mirror.

In certain embodiments, compared to glasses made of ordinary optical lenses, such as myopia glasses, presbyopia glasses, or VR glasses, the corners may become dark and blurred during use, especially when the degree is high and the lenses are thicker. The light propagates in the thicker lens sheet at the edge of the lens, which will weaken the light. In the case of insufficient light conditions, blurred and darkened imaging is likely to occur. The present disclosure uses ultra-thin lenses with Fresnel structures to retain only the Fresnel structure that refracts to the maximum extent. Myopia glasses, presbyopia glasses, or VR glasses made of ultra-thin Fresnel lenses can effectively reduce the wearer's mounting load, improve the comfort of long-term wearing, relieve eye fatigue, and also meet the design of miniaturization and lightness of eyewear products.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic structural diagram of an ultra-thin lens based on a Fresnel structure provided by an embodiment of the present disclosure;

FIG2 is a schematic structural diagram of an ultra-thin lens provided by an embodiment of the present disclosure, including a lens base layer and a coating layer;

FIG3 is a schematic diagram of a Fresnel structure formed by Fresnelizing the surface of a spherical convex lens according to an embodiment of the present disclosure;

FIG4 is a schematic diagram of a Fresnel structure formed by Fresnelizing the surface of a spherical concave lens according to an embodiment of the present disclosure; and

FIG5 is a schematic diagram of a sandwich structure of an ultra-thin lens provided by an embodiment of the present disclosure, including a lens base layer, a coating layer and a protective layer.

As shown in the above figure: 100 - ultra-thin lens; 1 - lens base layer; 2 - coating layer; 3 - protective layer; 11 - first surface; 12 - second surface; 13 - multiple concentric rings; 14 - step.

Details

In order to facilitate the understanding of the present disclosure, the present disclosure is further described below with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present disclosure are shown in the accompanying drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the present disclosure more thorough and comprehensive.

It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element in the middle at the same time. The terms "first surface" and "second surface" used in this specification refer to two oppositely disposed side surfaces of the lens substrate. The Fresnel structure is formed on the first surface of the lens substrate. Either the first surface or the second surface may be disposed relative to the human eye. These similar expressions are only for the purpose of clearer explanation and do not limit the overall concept of the present disclosure. In the figures, units with similar structures are marked with the same reference numerals.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

As shown in Fig. 1 and Fig. 2, the present disclosure provides a Fresnel ultra-thin lens 100, comprising a lens substrate 1, wherein the lens substrate 1 has a first surface 11 and a second surface 12 arranged opposite to each other, and the second surface 12 of the lens substrate 1 is designed as a plane or a free-form surface. The first surface 11 of the lens substrate 1 comprises a plurality of concentric rings 13, the centers of the plurality of concentric rings 13 coincide with the center of the first surface 11, and the diameters of the plurality of concentric rings 13 increase outwardly from the center of the first surface 11, and are evenly distributed on the first surface 11 of the lens substrate 1; steps 14 are formed between adjacent concentric rings 13 along the thickness direction of the lens substrate 1.

In some embodiments, the plurality of concentric rings 13 on the first surface 11 may be designed as a Fresnel structure.

The "Fresnel structure" in the present disclosure refers to a structure obtained by dividing a spherical surface or a non-spherical surface into a plurality of concentric rings and arranging them into steps formed in a cross-sectional view, and the Fresnel structure has a radius of curvature equal to that of the original spherical surface or the non-spherical surface. As shown in FIG. 3, a Fresnel structure is formed by Fresnelizing the surface of a spherical convex lens. A schematic diagram of a Fresnel structure is shown in FIG4 , which shows a schematic diagram of a Fresnel structure formed by Fresnelizing the surface of a spherical concave lens. The heights of the steps 14 between the concentric rings are all consistent, so that the coating layer 2 is more evenly coated on the Fresnel structure, and the coating thickness is consistent.

According to the Fresnel lens design method combined with the free-form surface design concept, a plurality of concentric rings 13 are processed on the first surface 11 of the lens base layer 1 by a known molding method, such as injection molding or die-casting processing method, and finally a Fresnel structure is formed on the first surface 11 of the lens base layer 1. In this case, the Fresnel structure and the lens base layer 1 are an integrally formed structure, as shown in FIG2. For the wearer, if the wearer wears myopia glasses, presbyopia glasses or VR glasses made of the ultra-thin lens 100 of the present disclosure for a long time, it is easier to reduce the wearer's mounting load, improve the comfort of long-term wearing, relieve eye fatigue, and meet the product's thin and small design.

In some embodiments, the sheet with the Fresnel structure can also be placed on the lens substrate 1 by pressing. Therefore, the sheet with the Fresnel structure can be made of a material different from that of the lens substrate 1, and does not need to be dependent on the material of the lens substrate 1. The design of the sheet with the Fresnel structure is more flexible.

In some embodiments, the lens substrate 1 may be made of thermoplastic resin, such as PMMA (polymethylmethacrylate, also known as acrylic or organic glass), or PC (Polycarbonate). The effective focal length EFL (Effective Focal Length, the distance from the center of the lens substrate 1 to the focal point) of the lens substrate 1 satisfies: 20mm<EFL<60mm or -60mm<EFL<-20mm.

In certain embodiments, as shown in FIG. 1 , the ultra-thin lens 100 of an embodiment of the present disclosure further includes a coating layer 2 uniformly coated on the first surface 11 of the lens base layer 1, that is, a coating layer 2 is applied on the Fresnel surface. The coating liquid is applied to the Fresnel surface so that the coating liquid uniformly fills the steps 14 formed between the concentric rings, and a transparent solidified coating layer 2 is formed after drying, which is completely adhered to the lens base layer 1 having a Fresnel structure. Drying can be performed through a drying process, such as air drying, ultraviolet exposure, and heat drying. The coating layer 2 is made of a transparent optical material, which not only does not affect the light transmittance, but also can be manufactured according to different functional requirements of the lens. For example, if it is necessary to manufacture a myopic ultra-thin lens 100 adapted to myopic users, the coating layer 2 is coupled with the lens base layer 1 to form a plano-concave lens (the side close to the eyeball is concave), and the myopic The wearer can wear myopia glasses made of the myopia ultra-thin lens 100, which is lighter to wear, has clearer images, and improves the wearing comfort of the user; or, if it is necessary to manufacture a presbyopic ultra-thin lens 100 suitable for presbyopic users, the coating layer 2 is coupled with the lens base layer 1 to form a convex lens (the side close to the eyeball is convex), which is lighter to wear, has clearer images, and improves the user experience.

It should be noted that the coating layer 2 and the lens base layer 1 can be coupled to form a plane lens or a plano-concave lens or a plano-convex lens. The Fresnel surface evenly covered with the coating layer 2 is always located on one side of the lens plane. This is to facilitate the tight coating of the coating layer 2 and avoid bubbles or unevenness during the coating process.

The coating layer 2 can also prevent oil stains or dust in the air from accumulating in the steps 14 of the Fresnel structure, thereby preventing these stains from affecting the clarity of the ultra-thin lens 100 .

Because the refractive power of each user's eyes is different, it can be checked with a professional ophthalmometer to prepare optical lenses with different refractive power values. In the present disclosure, by coating the first surface of the Fresnel base layer 1 with a coating layer of a preset refractive index n, the first preset refractive power value of the base layer 1 is obtained and/or the curvature radius of the second surface of the base layer 1 is processed to obtain the second preset refractive power value of the second surface. The first preset refractive power value interacts with the second preset refractive power value to finally obtain the ideal refractive power value of the ultra-thin lens 100. Specifically, in some embodiments, in order to meet the personalized needs of users, the coating layer 2 can be made of a variety of transparent optical materials with different refractive indices n. Ultra-thin lenses 100 with different refractive power values D can be generated by presetting the refractive index n of the coating layer 2. Coating layers 2 with various different refractive indices n are applied to the lens base layer 1 to configure ultra-thin lenses 100 with different refractive power values D.

In certain embodiments, the refractive power calculation formula of the lens comprising base layer 1 and coating layer 2 is as follows:
D＝(n0-n)/R0*1000

Among them, n0 is the refractive index of the lens base layer 1, n is the refractive index of the coating layer 2, R0 is the radius of curvature of the Fresnel structure, and D is the diopter of the overall ultra-thin lens.

In some embodiments, during the design of the Fresnel structure combined with the free-form surface, the lens base layer 1 having the Fresnel surface is designed to have an initial refractive power value of +26D and an initial curvature radius R0=-19mm. When the coating layer 2 having a refractive index n of 1.586 is applied to the Fresnel structure, an ultra-thin lens 100 having a first preset refractive power value of -5.0D can be obtained; when the refractive index n is applied, the lens base layer 1 having the Fresnel surface is designed to have an initial refractive power value of +26D and an initial curvature radius R0=-19mm. The coating layer 2 with a coefficient n of 1.53 can obtain an ultra-thin lens 100 with a first preset diopter value of -2.0D after the Fresnel structure.

In certain embodiments, the second surface 12 of the lens substrate 1 may also be processed to have a different radius of curvature R2 to produce a second preset diopter value, thereby configuring an ultra-thin lens 100 that can produce different diopter values.

After the processing steps described above, two kinds of ultra-thin lenses with first preset refractive values of -5.0D and -2.0D are obtained. Optionally, the radius of curvature R2 of the second surface 12 of the lens base layer 1 is further processed, and the second surface produces a second preset refractive value of +2.0D. In this case, after the first preset refractive value and the second preset refractive value interact with each other, the final refractive values of the ultra-thin lens 100 are -3.0D and 0.0D.

The correlation between the parameters is shown in Table 1 below:

Table 1

It should be noted that when the diopter of the ultra-thin lens 100 satisfies: -20D∽0.0D, the focal length EFL of the lens base layer 1 satisfies 20mm<EFL<60mm, and the refractive index n of the coating layer 2 satisfies: 1.3<n<1.9; when the diopter of the ultra-thin lens 100 satisfies: 0.0D∽+20D, the focal length EFL of the lens base layer 1 satisfies -60mm<EFL<-20mm, and the refractive index n of the coating layer satisfies: 1.4<n<1.9. In some embodiments, the coating layer 2 is made of optical glue. In some embodiments, the optical glue can be ultraviolet glue.

In the above embodiment, the refractive index n of the coating layer 2 and the refractive index n0 of the lens base layer 1 satisfy the following relationship: 0.81<n/n0<1.36, which better meets the design requirements of the ultra-thin lens 100 to be lightweight and thin, and can also provide an ideal refractive power for correcting vision according to user needs.

In certain embodiments, the coating layer 2 is formed by applying a curable coating liquid material to the Fresnel surface and then drying and curing to form a solid protective film with hardness. This coated optical material can increase the light transmittance, wear resistance, scratch resistance and wiping resistance of the ultra-thin lens. In this case, the coating layer 2 not only has the function of fully filling and fitting the uneven steps on the Fresnel surface of the lens base layer 1, but also plays a role in protecting the entire ultra-thin lens 100 (in this embodiment, the ultra-thin lens 100 includes the lens base layer 1 and the coating layer 2) after drying, thereby improving the anti-shattering performance and service life of the ultra-thin lens 100.

In some embodiments, the thickness of the lens base layer 1 does not exceed 1.5 mm; the thickness of the coating layer 2 does not exceed 0.5 mm. In order to prevent the ultra-thin lens 100 from deforming due to internal stress caused by thermal expansion and contraction in an alternating hot and cold environment, and to prevent a gap from being formed between the lens base layer 1 and the coating layer 2, thereby affecting the refractive effect of the lens, the thermal expansion coefficients of the coating layer 2 and the lens base layer 1 are designed to be consistent.

As shown in FIG. 5 , in order to further improve the overall anti-shattering performance of the ultra-thin lens 100, of course, a protective layer 3 can be added outside the lens base layer 1 and the coating layer 2 to enhance the protective performance of the coating layer 2 and improve the anti-shattering performance and service life of the ultra-thin lens 100. The protective layer 3 can also be designed to be transparent without affecting the light transmittance of the ultra-thin lens 100. In some embodiments, it is made of tempered glass. In this embodiment, the lens base layer 1, the coating layer 2 and the protective layer 3 form a sandwich structure. In the process of applying the liquid coating layer 2, the protective layer 3 and the lens base layer 1 interact with each other, which can not only ensure that the liquid coating layer 2 is applied more evenly and flatter on the first surface 11 of the lens base layer 1, but also make the sandwich structure of the ultra-thin lens 100 more suitable for further processing of the ultra-thin lens 100 as a whole, so as to meet different application scenarios of the ultra-thin lens 100, such as surface hard coating treatment, cutting processing and other process treatments.

In certain embodiments, the present disclosure relates to glasses using ultrathin lenses based on the Fresnel structure as described above, the glasses including myopia glasses, presbyopia glasses or VR glasses, wherein the ultrathin lenses based on the Fresnel structure can be used as one of the layers or layers in the glasses structure. When the ultrathin lenses are made into plano-convex lenses, the glasses are presbyopia glasses. When the ultrathin lenses are made into plano-concave lenses, the glasses are myopia glasses. When the ultrathin lenses are made into plane lenses or plano-convex lenses or plano-concave lenses, the glasses are VR glasses.

In summary, compared with ordinary lenses with corrective diopter, The corners will become dark and blurry, especially when the degree is high and the lens is thick. The light will be weakened when it propagates in the thick lens at the edge of the lens. In the case of insufficient light conditions, blurred and darkened imaging is likely to occur. The ultra-thin lens of the present disclosure uses a Fresnel structure to retain only the Fresnel structure that refracts to the maximum extent, forming the ultra-thin eyeglass lens with a Fresnel structure in the present disclosure. Myopia glasses, presbyopia glasses or VR glasses made of ultra-thin lenses based on the Fresnel structure can improve the comfort of long-term wearing, relieve eye fatigue, and meet the design requirements of lightness, thinness and compactness.

It should be noted that the above-mentioned technical features can be combined with each other to form various embodiments not listed above, which are all deemed to be within the scope of the present disclosure; and, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should fall within the scope of protection of the claims attached hereto.

Claims

An ultra-thin lens, comprising a lens substrate; the lens substrate having a first surface and a second surface arranged opposite to each other, the first surface comprising a plurality of concentric rings, the centers of the plurality of concentric rings coinciding with the center of the first surface; the diameters of the plurality of concentric rings increasing outward from the center of the first surface, and distributed on the first surface, and steps formed between adjacent concentric rings along the thickness direction of the lens substrate;

The ultra-thin lens also includes a coating layer uniformly coated on the first surface. The coating layer can be made of materials with different refractive indices n. Coating layers with different refractive indices n can produce ultra-thin lenses with different refractive diopter values D. The refractive diopter value D of the ultra-thin lens satisfies: -20D∽0.0D, or 0.0D∽20D.
The ultra-thin lens as claimed in claim 1, wherein the plurality of concentric rings included on the first surface are arranged into a Fresnel structure.
The ultra-thin lens as claimed in claim 1 or 2, wherein the coating layer completely adheres to the first surface having the Fresnel structure and uniformly fills the steps of the Fresnel structure, and the steps have the same height along the thickness direction of the lens base layer.
The ultra-thin lens according to any one of claims 1 to 3, wherein the Fresnel structure is configured as a spherical surface or an aspherical surface.
The ultra-thin lens according to any one of claims 1 to 4, wherein the second surface of the lens substrate is designed to be a plane or a free-form surface.
The ultra-thin lens according to any one of claims 1 to 5, wherein when the refractive power of the ultra-thin lens satisfies: -20D∽0.0D, the focal length EFL of the lens base layer satisfies 20mm<EFL<60mm, and the refractive index n of the coating layer satisfies: 1.3<n<1.9; when the refractive power of the ultra-thin lens satisfies: 0.0D∽+20D, the focal length EFL of the lens base layer satisfies: -60mm<EFL<-20mm, and the refractive index n of the coating layer satisfies: 1.4<n<1.9.
The ultra-thin lens according to any one of claims 1 to 6, wherein the refractive index n of the coating layer and the refractive index n0 of the lens base layer satisfy: 0.81<n/n0<1.36.
The ultra-thin lens as claimed in any one of claims 1 to 7, wherein the second surface of the lens substrate can be configured to have different curvature radii R2, and ultra-thin lenses with different refractive power values D can be produced by changing the curvature radius R2 of the second surface.
The ultra-thin lens according to any one of claims 1 to 8, wherein the coating layer and the lens substrate are coupled to form a plane lens, a plano-convex lens, or a plano-concave lens.
The ultra-thin lens according to any one of claims 1 to 9, wherein the coating layer comprises ultraviolet glue.
The ultra-thin lens according to any one of claims 1 to 10, wherein the thermal expansion coefficients of the coating layer and the lens substrate are consistent.
Spectacles comprising the ultra-thin lens according to any one of claims 1 to 11.
The glasses as claimed in claim 12, wherein the glasses are selected from myopia glasses, presbyopic glasses or VR glasses.