High-definition optical lens and preparation method thereof

Abstract

The invention provides a high-definition optical lens and a preparation method thereof, the high-definition optical lens comprises an outer layer, a middle layer and an inner layer which are sequentially arranged, the outer surface of the outer layer is a spherical surface, the inner surface of the outer layer is a free-form surface, the outer surface of the inner layer is a spherical surface, the inner surface of the inner layer is a wavy surface, and the middle layer is of a structure formed by curing a plastic material filled between the outer layer and the inner layer. The invention also provides a method for preparing the optical lens. According to the invention, the dual technical advantages of a free-form surface lens and a wave surface lens are combined, so that the lens has higher definition; the free-form surface and the wave surface are correspondingly arranged on the opposite inner side surfaces of the outer layer and the inner layer of the lens respectively and are protected by the middle layer, the actual outer surface of the lens is still a smooth spherical surface, the lens can be wiped by lens wiping paper and lens wiping cloth normally, and the cleaning convenience is improved; and the outer surface structure of the smooth spherical surface is not easy to influence the functionality of the free-form surface and the wavy surface due to abrasion, so that the service life of the lens is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lens production, and in particular to a high-definition optical lens and a preparation method thereof. Background Art

[0002] Traditional optical lens surface designs include spherical and aspherical designs. Spherical design means that the front surface of the lens is an ordinary sphere, and the back surface is selected to be a spherical surface or a toric surface depending on whether it has astigmatism. Based on the principle of optical refraction, among the parallel light rays passing through the lens, the off-axis light rays will produce a stronger refraction effect than the paraxial light rays, which will cause inconsistent focus within the imaging area of ​​the lens and form aberrations. Specifically, when the paraxial light rays (the central area of ​​the lens) are precisely focused on the fovea of ​​the retina, the off-axis light rays (the peripheral area of ​​the lens) deviate from the focus position, resulting in blurred peripheral vision of the wearer of the lens. Based on the Tscherning ellipse theory, for spherical design, aberrations can only be controlled to an acceptable level when a high base curve (smaller radius of curvature) is used.

[0003] Aspheric design means that there is a continuous curvature change from the vertex to the edge on any meridian of at least one of the front and back surfaces of the lens. Aspheric design can be divided into front aspheric, back aspheric and double-sided aspheric design. Without considering the degree of astigmatism, aspheric design usually appears as a rotationally symmetric surface. Aspheric design means that the lens has a more complex surface shape. The variable curvature design can help thin the lens or reduce aberrations, while the double-sided aspheric design can also be optimized for astigmatism and achieve a better lens thinning effect.

[0004] Both the spherical and ordinary aspherical designs of lenses have weaknesses. First, because ordinary aspherical lenses are only designed for a fixed degree, peripheral vision optimization cannot cover the astigmatism degree part, and as the astigmatism degree increases, the optical aberration also increases. Even for double-sided aspherical lenses, although the astigmatism degree part can be optimized by combining the front and back surfaces, the area between the two orthogonal directions is still a relatively fixed smooth continuous change, and there is no optimization space with higher degrees of freedom. Second, according to the corneal wavefront aberration analyzer inspection, it was found that because the front surface of the cornea is uneven, when the light enters the human eye and falls on the retina, the plane light wave will also be uneven, forming a wavefront, which will form tiny astigmatism or tiny aberrations. The accuracy of existing lenses is 0.25D, which is not enough to accurately correct these tiny astigmatism and tiny aberrations.

[0005] Based on the above problems, regarding problem 1, a "free-form surface" lens has appeared in the prior art. An optical model that can evaluate the visual acuity of the lens is built in conjunction with an eyeball rotation model. The surface shape of a quadrant of the lens surface can be optimized at multiple points, and a complete free-form toroidal design surface shape can be obtained after mirror expansion. This makes the clear area range of the free-form toroidal lens significantly improved compared to ordinary aspherical lenses.

[0006] Regarding question 2, the Chinese utility model patent with publication number CN212181193U discloses a lens with improved clarity. The front side of the lens body is an irregular wavy surface, which is used to correct the higher-order aberrations caused by the unevenness of the wearer's cornea. The wavy surface is pressed by a mold and corresponds to the higher-order aberrations caused by the unevenness of the cornea. A layer of metal film is also coated on the front side of the lens body. The wavy surface can compensate for the tiny aberrations or tiny astigmatism caused by the unevenness of the cornea, so that light passes through the corneal surface into the human eye and falls on the retina, which can form a plane light wave, accurately correct these tiny astigmatism and tiny aberrations, and make the image clearer and more perfect.

[0007] Although the above method solves the problem of non-smooth spherical lenses in the prior art, it has another practical problem, that is, after the surface of the non-smooth spherical lens is stained with dirt, it is difficult to clean it with common lens cleaning paper, lens cleaning cloth, etc., and the price of ultrasonic cleaning equipment is relatively expensive and not suitable for every family to equip, which leads to inconvenience in use. In addition, the non-smooth spherical lens has multiple curved surfaces or wavy surfaces with different refractive powers on the surface, which makes it more susceptible to wear and scratches, which undoubtedly reduces the service life of the lens.

[0008] The present invention aims to combine the technical advantages of the above-mentioned non-smooth spherical lenses and solve the problems of being difficult to clean and having a short service life. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a high-definition optical lens and a method for preparing the same, which solves the problems of being difficult to clean and having a short service life in the prior art.

[0010] In the first aspect, the present invention proposes a high-definition optical lens and a preparation method thereof, comprising an outer layer, a middle layer and an inner layer arranged in sequence, wherein the side close to the middle layer of the outer layer and the inner layer is the inner side, and the opposite side is the outer side, the outer surface of the outer layer is a spherical surface, and the inner surface is a free-form surface, the outer surface of the inner layer is a spherical surface, and the inner surface is a wavy surface, and the middle layer is a structure of solidified plastic material filled between the outer layer and the inner layer, so that the outer layer and the inner layer are tightly combined into one.

[0011] Furthermore, the inner surface edge of the outer layer is provided with a protruding limiting ring, the thickness of the limiting ring is much smaller than the radius of the outer layer, and the inner surface edge of the inner layer is provided with a smooth annular connecting portion with a non-wavy surface corresponding to the limiting ring.

[0012] Furthermore, the degree range of the outer layer and / or the inner layer is -6 to +4D.

[0013] Furthermore, in the inner surface of the outer layer and / or the inner layer, the radius of curvature of any point is in the range of 41 to 63 mm, and the diopter of any point is in the range of -13 to -8D.

[0014] Furthermore, the shape of the wave surface of the inner layer is determined according to corneal data.

[0015] Furthermore, the middle layer is made of resin material.

[0016] Furthermore, the thickness of the intermediate layer is 0.2-0.5 mm.

[0017] In a second aspect, the present invention further proposes a method for preparing the above-mentioned high-definition optical lens, comprising the following steps:

[0018] S1. Selecting a suitable lens outer layer or processing the outer layer through a mold according to prescription data such as the user's eye power, inclination, wrap angle and / or posterior vertex distance;

[0019] S2, collecting data of the front surface of the cornea of ​​the user's eyeball, customizing a mold according to the data, so that the surface of the mold corresponding to the inner side of the inner layer of the lens is a wavy surface, and then introducing a liquid or semi-liquid lens material into the mold, and forming the inner layer of the lens by high-temperature pressing;

[0020] S3, placing the outer layer and the inner layer into a fixed mold so that the inner surfaces of the outer layer and the inner layer are opposite to each other, controlling the distance between the two, and then injecting a liquid or semi-liquid intermediate layer material between the outer layer and the inner layer until the gap between the outer layer and the inner layer is completely filled;

[0021] S4. After the intermediate layer material is completely solidified, the integral lens blank formed by the outer layer, the intermediate layer and the inner layer is taken out, and then the edges are polished and ground until the excess intermediate layer material is completely removed, thereby obtaining a high-definition optical lens.

[0022] Furthermore, in the steps S1 and S2, after the outer layer and the inner layer are obtained, anti-reflection films are plated on their inner sides respectively.

[0023] Furthermore, in the step S3, when filling the intermediate layer material, high-frequency ultrasonic waves are applied toward the intermediate layer material.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention combines the dual technical advantages of free-form surface lenses and wavy surface lenses. The free-form surface structure enables the lens to have a large number of degrees of freedom, thereby optimizing the lens structure from the entire quadrant surface, greatly improving the range of the clear area; the wavy surface structure is arranged in accordance with the concave-convex structure of the cornea of ​​the eyeball, so that it can compensate for the slight aberration or slight astigmatism caused by the unevenness of the cornea, making the image clearer and more perfect, thereby having a higher overall clarity;

[0026] 2. In the present invention, the free-form surface and the wavy surface are respectively arranged on the relative inner sides of the outer layer and the inner layer of the lens, and then the gap between the outer layer and the inner layer is filled with an intermediate layer material to form an integrated structure, so that the free-form surface and the wavy surface are arranged inside the lens and protected by the intermediate layer. In this way, the actual outer surface of the lens is still a smooth spherical surface, which can be wiped normally with lens cleaning paper or lens cleaning cloth, thereby improving the convenience of cleaning; at the same time, the outer surface structure of the smooth spherical surface is not easy to affect the functionality of the free-form surface and the wavy surface due to wear, thereby improving the service life of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the present invention.

[0028] In the above drawings: 1, outer layer; 2, inner layer; 3, middle layer; 11, limiting ring.

[0029] Outer layer 1, inner layer 2, middle layer 3, limiting ring 11. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, an embodiment of the present invention proposes a high-definition optical lens and a preparation method thereof, comprising an outer layer 1, an intermediate layer 3 and an inner layer 2 arranged in sequence, wherein the outer layer 1 and the inner layer 2 have a side close to the intermediate layer 3 as the inner side and an opposite side as the outer side, the outer surface of the outer layer 1 is a spherical surface and the inner surface is a free-form surface, the outer surface of the inner layer 2 is a spherical surface and the inner surface is a wavy surface, and the intermediate layer 3 is a structure of solidified plastic material filled between the outer layer 1 and the inner layer 2, so that the outer layer 1 and the inner layer 2 are tightly combined into one.

[0032] In this embodiment, the inner layer 2 and the outer layer 1 can be made of glass or resin material, preferably thermoplastic resin material; the middle layer 3 is made of thermoplastic resin material, with a thickness of 0.2 to 0.5 mm, preferably 0.2 mm in this embodiment. Therefore, the structure of the outer layer 1 and the inner layer 2 of the lens can be customized more accurately according to the prescription data of the eyeball and the corneal data.

[0033] In a further solution, the inner surface edge of the outer layer 1 is provided with a protruding limiting ring 11, the thickness of the limiting ring 11 is much smaller than the radius of the outer layer 1, and the inner surface edge of the inner layer 2 is provided with a smooth annular connecting portion with a non-wavy surface corresponding to the limiting ring 11. By connecting the limiting ring 11 and the smooth annular connecting portion, the laying range of the resin material of the middle layer 3 can be better limited, so that it can be more evenly filled between the inner layer 2 and the outer layer 1, and at the same time, the resin material of the middle layer 3 can be prevented from being deflected or inflated due to external vibrations and other factors before solidification, thereby ensuring the complete filling of the resin material of the middle layer 3.

[0034] Preferably, in this embodiment, the power range of the outer layer 1 and the inner layer 2 is -6 to +4D. In this embodiment, the power of the outer layer 1 and the inner layer 2 is +2D, so the total power of the optical lens is +4D. At the same time, the radius of curvature of any point on the inner surface of the outer layer 1 and the inner layer 2 is in the range of 41 to 63 mm, and the diopter of any point is in the range of -13 to -8D.

[0035] The method for preparing a high-definition optical lens in an embodiment of the present invention comprises the following steps:

[0036] (1) According to the prescription data of the user's eye power, inclination, wrap angle and / or posterior vertex distance, a suitable lens outer layer 1 is selected or the outer layer 1 is processed by a mold.

[0037] (2) A corneal wavefront aberration analyzer is used to collect data on the front surface of the user's cornea, and a mold is customized based on the data so that the surface of the mold corresponding to the inner side of the inner layer 2 of the lens is a wavy surface. Then, a liquid or semi-liquid lens material is introduced into the mold, and the inner layer 2 of the lens is formed by high-temperature pressing.

[0038] After obtaining the outer layer 1 and the inner layer 2, anti-reflection films can be coated on their inner sides respectively, so as to further protect the free-form surface and the wavy surface, avoid damage to them during processing, and further improve the light transmittance.

[0039] (3) Place the outer layer 1 and the inner layer 2 in a fixed mold so that the inner surfaces of the outer layer 1 and the inner layer 2 face each other, control the distance between them, and then inject the liquid or semi-liquid intermediate layer 3 material between the outer layer 1 and the inner layer 2 until it completely fills the gap between the outer layer 1 and the inner layer 2. In this method, the outer layer 1 and the inner layer 2 are in a vertical state during the fixing process, and the top opening of the mold is used to inject the intermediate layer 3 material.

[0040] When the inner surface of the outer layer 1 has a limiting ring 11 and the inner surface of the inner layer 2 has a smooth annular connecting portion, the outer layer 1 and the inner layer 2 are vertically stacked. The outer layer 1 is now fixed at the bottom of the mold, and then the middle layer 3 material is injected and overflows into the outer layer 1 and the limiting ring 11. Subsequently, the inner layer 2 is placed from above and fixed, and the inner layer 2 is squeezed to make it in close contact with the limiting ring 11, and the processing is completed.

[0041] In addition, when filling the middle layer 3 material, high-frequency ultrasound is applied toward the direction of the middle layer 3 material so that the range of the ultrasound completely covers the middle layer 3, thereby making the liquid or semi-liquid middle layer 3 resin material evenly distributed and in complete contact with the inner side surfaces of the inner layer 2 and the outer layer 1, and eliminating any bubbles that may be generated.

[0042] (4) After the material of the middle layer 3 is completely solidified, the overall lens blank formed by the outer layer 1, the middle layer 3, and the inner layer 2 is taken out, and then the edges are polished and ground until the excess material of the middle layer 3 is completely removed, thereby obtaining a high-definition optical lens.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high-definition optical lens and a method for preparing the same, characterized in that: It includes an outer layer, a middle layer and an inner layer arranged in sequence, wherein the side close to the middle layer is the inner side and the opposite side is the outer side, the outer surface of the outer layer is a spherical surface and the inner surface is a free-form surface, the outer surface of the inner layer is a spherical surface and the inner surface is a wavy surface, and the middle layer is a structure of solidified plastic material filled between the outer layer and the inner layer, so that the outer layer and the inner layer are tightly combined into one.

2. A high-definition optical lens and a method for preparing the same as claimed in claim 1, characterized in that: The inner surface edge of the outer layer is provided with a protruding limiting ring, the thickness of the limiting ring is much smaller than the radius of the outer layer, and the inner surface edge of the inner layer is provided with a smooth annular connecting portion with a non-wavy surface corresponding to the limiting ring.

3. A high-definition optical lens and a method for preparing the same as claimed in claim 1, characterized in that: The outer layer and / or the inner layer has a degree range of -6 to +4D.

4. A high-definition optical lens and a method for preparing the same as claimed in claim 3, characterized in that: The radius of curvature at any point on the inner surface of the outer layer and / or the inner layer is in the range of 41 to 63 mm, and the diopter at any point is in the range of -13 to -8D.

5. A high-definition optical lens and a method for preparing the same as claimed in claim 1, characterized in that: The wave surface shape of the inner layer is determined according to corneal data.

6. A high-definition optical lens and a method for preparing the same as claimed in claim 1, characterized in that: The middle layer is made of resin material.

7. A high-definition optical lens and a method for preparing the same as claimed in claim 1, characterized in that: The thickness of the intermediate layer is 0.2-0.5 mm.

8. A method for preparing the high-definition optical lens as claimed in claim 1, characterized in that: The steps include: S1. Selecting a suitable lens outer layer or processing the outer layer through a mold according to prescription data such as the user's eye power, inclination, wrap angle and / or posterior vertex distance; S2, collecting data of the front surface of the cornea of ​​the user's eyeball, customizing a mold according to the data, so that the surface of the mold corresponding to the inner side of the inner layer of the lens is a wavy surface, and then introducing a liquid or semi-liquid lens material into the mold, and forming the inner layer of the lens by high-temperature pressing; S3, placing the outer layer and the inner layer into a fixed mold so that the inner surfaces of the outer layer and the inner layer are opposite to each other, controlling the distance between the two, and then injecting a liquid or semi-liquid intermediate layer material between the outer layer and the inner layer until the gap between the outer layer and the inner layer is completely filled; S4. After the intermediate layer material is completely solidified, the integral lens blank formed by the outer layer, the intermediate layer and the inner layer is taken out, and then the edges are polished and ground until the excess intermediate layer material is completely removed, thereby obtaining a high-definition optical lens.

9. The preparation method according to claim 8, characterized in that: In the steps S1 and S2, after the outer layer and the inner layer are obtained, anti-reflection films are respectively plated on the inner sides thereof.

10. The preparation method according to claim 8, characterized in that: In the step S3, when filling the intermediate layer material, high-frequency ultrasonic waves are applied toward the intermediate layer material.

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