Aspherical annular multifocal lens and its manufacturing process
By designing aspherical ring-separated multifocal lenses and their manufacturing process, the problems of vision deterioration and eye fatigue caused by prolonged use of the eyes have been solved, achieving multifunctional protection and vision correction effects of the lenses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGSU DONGBAO OPTICAL
- Filing Date
- 2023-09-05
- Publication Date
- 2026-06-09
AI Technical Summary
Prolonged use of the eyes can lead to worsening vision and eye fatigue, especially for those who already wear glasses, as existing lenses are often insufficient to provide effective relief.
Design an aspherical ring-shaped multifocal lens, comprising a substrate and a coating layer. The substrate consists of a defocus area, an outer refractive ring area, a ring-shaped refractive area, and a refractive center area. The coating layer consists of multiple thin films and has anti-electromagnetic wave and anti-dust/anti-fog functions. It is processed using a specific manufacturing process.
Through its aspherical design and multi-layered coating, the lens effectively corrects astigmatism, slows the progression of myopia and axial elongation, reduces eye fatigue, and features blue light protection and photochromic properties, providing a clearer visual experience.
Smart Images
Figure CN117270236B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical technology, and in particular to an aspherical ring-shaped multifocal lens and its manufacturing process. Background Technology
[0002] With the increasing use of our eyes in modern environments, the time our eyes spend working has been greatly extended. Especially for people who already wear glasses, prolonged use of the eyes may further worsen their vision and may even lead to eye fatigue and a series of eye diseases due to excessive eye strain. Summary of the Invention
[0003] The main objective of this invention is to provide an aspherical ring-shaped multifocal lens and its manufacturing process to solve the above-mentioned technical problems.
[0004] The present invention provides an aspherical ring-shaped multifocal lens in a first aspect, comprising a substrate and a coating layer attached to the substrate. The substrate includes a defocus region and a progressively nested outer refractive ring region, a ring-shaped refractive region, and a central refractive region. The defocus region is disposed within the ring-shaped refractive region and surrounds the central refractive region. A defocusing region is provided between the central refractive region and the defocus region. The photometric power of the outer refractive ring region, the ring-shaped refractive region, and the central refractive region decreases progressively. The coating layer comprises a first silica low-refractive film layer, a first zirconia high-refractive film layer, a second silica low-refractive film layer, a second zirconia high-refractive film layer, an ITO anti-electromagnetic wave film layer, a third silica low-refractive film layer, and a dustproof and anti-fog film layer, which are stacked sequentially.
[0005] Preferably, the annular focal zone includes a visual area and an illumination area embedded within the visual area, the illumination area surrounding the refractive center area.
[0006] Preferably, the defocus area includes a first defocus area and a second defocus area, the first defocus area is laid on the viewing area, and the second defocus area and the defocusing area are both laid on the light-adding area.
[0007] Preferably, the defocus area is a defocus microlens in a multiple circular array.
[0008] Preferably, the number of defocused microlenses is 550.
[0009] Preferably, the photometric intensity of the refractive center is -3.75.
[0010] Preferably, the photometric range of the illumination zone is (-3.75, -3.50), and the photometric range of the viewing zone is (-3.50, -1.50).
[0011] Preferably, the outer diameter of the refractive outer ring area is 73.5 mm, the outer diameter of the optometry area is 43.6 mm, the outer diameter of the light-adding area is 17.4 mm, and the diameter of the refractive central area is 9 mm. The outer diameter of the optometry area is the inner diameter of the refractive outer ring area, the outer diameter of the light-adding area is the inner diameter of the optometry area, and the diameter of the refractive central area is the inner diameter of the light-adding area.
[0012] Preferably, both the viewing area and the illumination area are aspherical.
[0013] In a second aspect, the present invention provides a process for manufacturing an aspherical ring-shaped multifocal lens, comprising:
[0014] S100: Dehumidify and control the temperature inside the mold cavity, wherein the humidity inside the mold cavity is controlled to be below 0.02% and the temperature is controlled between 280-300℃;
[0015] S200: Plasticized polycarbonate is injected into the mold for the first time via screw injection, wherein the injection volume of the first injection is controlled between 50% and 95%.
[0016] S300: The mold closes at a pre-tuned speed to compress the polycarbonate. During this period, the polycarbonate is injected into the mold a second time through the screw injection until the cavity inside the mold is filled. The screw injection state is maintained to ensure the internal pressure of the mold.
[0017] S400: Reduce the temperature inside the mold to below 140°C and push back the screw to recycle the remaining polycarbonate;
[0018] S500: Open the mold and take out the aspherical ring-shaped multifocal lens. Place the aspherical ring-shaped multifocal lens in an air-conditioned room for pre-cooling, wherein the cooling temperature is 16°C.
[0019] S600: Place the pre-cooled aspherical ring-shaped multifocal lens into the first tank containing IPA solution for 68 seconds and the second tank containing curing solution for 30 seconds.
[0020] S700: The aspherical ring-shaped multifocal lens after being immersed in liquid is placed in the baking oven for pre-baking and baking in sequence. The pre-baking temperature and time are 90℃ and 20 minutes, respectively, and the baking temperature is 125℃ and 3 hours.
[0021] S800: The baked aspherical ring-shaped multifocal lens is placed in a cleaning tank for cleaning. The cleaned aspherical ring-shaped multifocal lens is then coated. The cleaning tank uses pure water with a quality of 13 megohms or higher. The coating consists of a first silica low-refractive film layer, a first zirconium oxide high-refractive film layer, a second silica low-refractive film layer, a second zirconium oxide high-refractive film layer, an ITO anti-electromagnetic wave film layer, a third silica low-refractive film layer, and a dustproof and anti-fog film layer, which are stacked in sequence.
[0022] S900: After completing the above process steps, the product is sent for quality inspection to obtain the finished aspherical ring-separated multifocal lens.
[0023] The beneficial effects of this invention are as follows: It provides an aspherical ring-separated multifocal lens and its manufacturing process. The aspherical ring-separated multifocal lens includes a substrate and a film layer attached to the substrate. The substrate includes a defocus area and a progressively nested refractive outer ring area, a refractive focal area, and a refractive central area. The defocus area is laid within the refractive focal area and surrounds the refractive central area. A defocus isolation area is provided between the refractive central area and the defocus area. The light intensity of the refractive outer ring area, the refractive focal area, and the refractive central area decreases progressively. The film layer includes a first silica low-refractive film layer, a first zirconia high-refractive film layer, a second silica low-refractive film layer, a second zirconia high-refractive film layer, an ITO anti-electromagnetic wave film layer, a third silica low-refractive film layer, and a dustproof and anti-fog film layer, which protect vision and reduce eye fatigue. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the substrate structure in an embodiment of the present invention. Figure 1 ;
[0025] Figure 2 This is a schematic diagram of the substrate structure in an embodiment of the present invention. Figure 2 ;
[0026] Figure 3 This is a schematic diagram of the membrane structure in an embodiment of the present invention;
[0027] Figure 4 This is a flowchart of the preparation process in the embodiments of the present invention;
[0028] Figure 5 This is a schematic diagram of the structure of an aspherical lens in the prior art.
[0029] The numbers in the diagram are: 100 Defocus zone, 101 First defocus zone, 102 Second defocus zone, 200 Outer refractive ring zone, 300 Ring focus zone, 301 Optical zone, 302 Added light zone, 400 Central refractive zone, 500 Defocusing zone, 600 Coating layer, 601 First silica low-refractive coating layer, 602 First zirconia high-refractive coating layer, 603 Second silica low-refractive coating layer, 604 Second zirconia high-refractive coating layer, 605 ITO anti-electromagnetic wave coating layer, 606 Third silica low-refractive coating layer, 607 Anti-dust and anti-fog coating layer, 700 Aspherical lens. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0031] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains.
[0032] The terms "first," "second," and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] See appendix Figure 1-4The present invention provides an aspherical ring-shaped multifocal lens in a first aspect, comprising a substrate and a film layer 600 attached to the substrate. The substrate includes a defocus region 100 and a progressively nested refractive outer ring region 200, a refractive ring region 300, and a refractive central region 400. The defocus region 100 is disposed within the refractive ring region 300 and surrounds the refractive central region 400. A defocusing region 500 is provided between the refractive central region 400 and the defocus region 100. The optical power of the refractive outer ring region 200, the refractive ring region 300, and the refractive central region 400 decreases progressively. The film layer comprises a first silica low-refractive film layer 601, a first zirconia high-refractive film layer 602, a second silica low-refractive film layer 603, a second zirconia high-refractive film layer 604, an ITO anti-electromagnetic wave film layer 605, a third silica low-refractive film layer 606, and a dustproof and anti-fog film layer 607, which are stacked sequentially.
[0035] Specifically, in this embodiment, the aspherical ring-focused multifocal lens is made of PC material, namely polycarbonate, which has advantages such as impact resistance, a center thickness of 1.2mm, and resistance to electromagnetic radiation, ultraviolet rays, and stains. The substrate of the aspherical ring-focused multifocal lens adopts a nested ring structure, with the outer refractive ring area 200, the ring focal area 300, and the refractive central area 400 nested in sequence. The ring focal area 300 includes the optical zone 301 and the light-adding zone 302 embedded in the optical zone 301. Both the optical zone 301 and the light-adding zone 302 are aspherical, that is, the optical zone 301 and the light-adding zone 302 together form the aspherical ring focal area. The ring focal lens can be thinner and lighter, reducing the pressure on the bridge of the nose. Its curvature and power changes can correctly focus light rays from different axes onto a single focal point, thereby correcting visual problems caused by astigmatism. Furthermore, the aspherical design differs from ordinary spherical lenses in its surface curvature. From the center to the periphery, the radius of curvature gradually increases (the lens surface gradually flattens), resulting in an astigmatism of 0.10D and excellent image quality. Its purpose is to reduce aberrations in optical corrective lenses and make the lens flatter, thus reducing magnification. This leads to clearer, thinner, and lighter high-quality lenses, as shown in the attached image. Figure 5The aspherical lens shown in this embodiment employs the same aspherical design for its refractive area 301 and illumination area 302. This design allows the aspherical ring-focal lens to better correct the elliptical shape of the cornea or lens, helping astigmatic patients achieve clearer and more accurate vision. The illumination area 302 surrounds the refractive center area 400. Both the refractive area 301 and the illumination area 302 are covered by defocus areas 100. The defocus areas 100 include a first defocus area 101 and a second defocus area 102. The first defocus area 101 is covered by... On the optical zone 301, the second defocus zone 102 and the defocusing zone 500 are both laid on the light-adding zone 302. Among them, the defocus zone 100 is a multiple circular array of defocus microlenses, with a total of 550 defocus microlenses. It should be noted that the purpose of setting multiple defocus microlenses here is to ensure that while forming a sufficiently clear image on the retina, a myopia defocus signal can be continuously and stably formed in front of the retina, thereby slowing down the progression of myopia and slowing down the growth of the axial length of the eye, which can also have an anti-fatigue effect.
[0036] Furthermore, the photometric power of the refractive center 400 is -3.75. The photometric power range of the additional light area 302 is (-3.75, -3.50), and the photometric power range of the optometry area 301 is (-3.50, -1.50).
[0037] Furthermore, the outer diameter of the refractive outer ring zone 200 is 73.5 mm, the outer diameter of the optometry zone 301 is 43.6 mm, the outer diameter of the refractive area 302 is 17.4 mm, and the diameter of the refractive central zone 400 is 9 mm. Among these, the outer diameter of the optometry zone 301 is the inner diameter of the refractive outer ring zone 200, the outer diameter of the refractive area 302 is the inner diameter of the optometry zone 301, and the diameter of the refractive central zone 400 is the inner diameter of the refractive area 302.
[0038] In another embodiment, silver halide is added to the polycarbonate material, giving the aspherical ring-shaped multifocal lens a photochromic function, i.e., a photochromic lens. This is based on the principle of a reversible photochromic reaction. When irradiated by activating light such as ultraviolet or short-wave visible light, halide ions release electrons, which are captured by silver ions, resulting in the following reaction: colorless silver halide decomposes into opaque silver atoms and transparent halogen atoms. The silver atoms absorb light, reducing the lens's light transmittance. Since the halogen in the photochromic lens does not escape, the reaction is reversible. After the activating light is removed, the silver and halogen recombine, restoring the aspherical ring-shaped multifocal lens to its original transparent, colorless, or light-colored state. Lowering the temperature alters the "activity" of the photochromic reaction, slowing down the recombination reaction and the lens's restoration of light transmittance, thus delaying the color change time. The lens automatically changes color according to changes in sunlight intensity to protect eyesight, enhance aesthetics, and reduce the stimulation and damage to the eyes from sunlight and ultraviolet rays.
[0039] The second aspect of the present invention provides a process for manufacturing an aspherical ring-shaped multifocal lens, comprising:
[0040] S100: Dehumidify and control the temperature inside the mold cavity, wherein the humidity inside the mold cavity is controlled to be below 0.02% and the temperature is controlled between 280-300℃;
[0041] S200: Plasticized polycarbonate is injected into the mold for the first time via screw injection, wherein the injection volume of the first injection is controlled between 50% and 95%.
[0042] S300: The mold closes at a pre-tuned speed to compress the polycarbonate. During this period, the polycarbonate is injected into the mold a second time through the screw injection until the cavity inside the mold is filled. The screw injection state is maintained to ensure the internal pressure of the mold.
[0043] S400: Reduce the temperature inside the mold to below 140°C and push back the screw to recycle the remaining polycarbonate;
[0044] S500: Open the mold and take out the aspherical ring-shaped multifocal lens. Place the aspherical ring-shaped multifocal lens in an air-conditioned room for pre-cooling, wherein the cooling temperature is 16°C.
[0045] S600: Place the pre-cooled aspherical ring-shaped multifocal lens into the first tank containing IPA solution for 68 seconds and the second tank containing curing solution for 30 seconds.
[0046] S700: The aspherical ring-shaped multifocal lens after being immersed in liquid is placed in the baking oven for pre-baking and baking in sequence. The pre-baking temperature and time are 90℃ and 20 minutes, respectively, and the baking temperature is 125℃ and 3 hours.
[0047] S800: The baked aspherical ring-shaped multifocal lens is placed in a cleaning tank for cleaning. The cleaned aspherical ring-shaped multifocal lens is then coated. The cleaning tank uses pure water with a quality of 13 megohms or higher. The coating consists of a first silica low-refractive film layer, a first zirconium oxide high-refractive film layer, a second silica low-refractive film layer, a second zirconium oxide high-refractive film layer, an ITO anti-electromagnetic wave film layer, a third silica low-refractive film layer, and a dustproof and anti-fog film layer, which are stacked in sequence.
[0048] S900: After completing the above process steps, the product is sent for quality inspection to obtain the finished aspherical ring-separated multifocal lens.
[0049] Specifically, in step S100, the melt's flowability is sensitive to temperature but not to pressure. It is close to a Newtonian fluid, belonging to the viscosity-temperature sensitive type. It can be considered a non-crystalline polymer with no distinct melting point. The melt viscosity is high, making flow difficult. Short and wide gates in the mold runner are required to reduce pressure loss, while also necessitating higher injection pressure. It is prone to decomposition at high temperatures, producing silver streaks on the finished product; therefore, drying is necessary before processing, and the mold cavity must be dehumidified and temperature controlled.
[0050] In this embodiment, the polycarbonate can incorporate materials with anti-blue light factors, enabling the aspherical ring-shaped multifocal lens to have anti-blue light functionality.
[0051] Screw injection refers to the process of pushing the material into the barrel using a screw, with the material to be injected placed inside the barrel. This injection method is a relatively existing process in the field, and will not be elaborated on here.
[0052] The pressure holding process in step S300 is necessary because the material will cool down and shrink, which may cause depressions or bubbles on the surface of the product. Therefore, it is necessary to maintain the injection state to ensure that pressure is maintained and to avoid the above situation from affecting the process.
[0053] In step S600, the aspherical ring-shaped multifocal lens is placed in a curing machine, which contains a first tank and a second tank. The first tank contains IPA solution, and the operation mode is as follows: immersion delay of 68.00 seconds, ultrasonic delay of 88.00 seconds, filtration time of 50.01 seconds, variable speed delay of 17.91 seconds, and variable speed second delay of 00.01 seconds. The second tank contains curing solution, and the operation mode is as follows: immersion delay of 30 seconds, ultrasonic delay of 15.01 seconds, filtration delay of 28.01 seconds, variable speed delay of 02.81 seconds, and variable speed second delay of 12.01 seconds.
[0054] In step S800, the coating of the aspherical ring-shaped multifocal lens is processed by vacuum deposition.
[0055] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept, but these improvements all fall within the protection scope of the present invention.
Claims
1. An aspherical ring-separated multifocal lens, characterized in that, The device includes a substrate and a film layer attached to the substrate. The substrate includes a defocus area and a progressively nested refractive outer ring area, a refractive ring area, and a refractive central area. The defocus area is laid within the refractive ring area and surrounds the refractive central area. A defocus isolation area is provided between the refractive central area and the defocus area. The photoluminescence of the refractive outer ring area, the refractive ring area, and the refractive central area decreases progressively. The film layer comprises a first low-refractive silica film layer, a first high-refractive zirconia film layer, a second low-refractive silica film layer, a second high-refractive zirconia film layer, an ITO anti-electromagnetic wave film layer, a third low-refractive silica film layer, and a dustproof and anti-fog film layer, which are stacked sequentially. The focal zone includes a viewing area and an illumination zone embedded within the viewing area, the illumination zone surrounding the refractive center area; The defocus area includes a first defocus area and a second defocus area. The first defocus area is laid on the viewing area, and the second defocus area and the defocusing area are both laid on the light-adding area. The defocused area is a multi-circular array of defocused microlenses.
2. The aspherical annular multifocal lens according to claim 1, characterized in that, The number of defocused microlenses is 550.
3. The aspherical annular multifocal lens according to claim 1, characterized in that, The photometric value of the refractive center is -3.
75.
4. The aspherical annular multifocal lens according to claim 3, characterized in that, The luminance range of the light-adding zone is (-3.75, -3.50), and the luminance range of the viewing zone is (-3.50, -1.50).
5. The aspherical annular multifocal lens according to claim 1, characterized in that, The outer diameter of the refractive outer ring area is 73.5 mm, the outer diameter of the optometry area is 43.6 mm, the outer diameter of the refractive injection area is 17.4 mm, and the diameter of the refractive central area is 9 mm. The outer diameter of the optometry area is the inner diameter of the refractive outer ring area, the outer diameter of the refractive injection area is the inner diameter of the optometry area, and the diameter of the refractive central area is the inner diameter of the refractive injection area.
6. The aspherical annular multifocal lens according to claim 1, characterized in that, Both the viewing area and the illumination area are aspherical.
7. A process for manufacturing an aspherical annular multifocal lens, used to manufacture the aspherical annular multifocal lens as described in any one of claims 1-6, characterized in that, The fabrication process of the aspherical ring-shaped multifocal lens includes: S100: Dehumidify and control the temperature inside the mold cavity, wherein the humidity inside the mold cavity is controlled to be below 0.02% and the temperature is controlled between 280-300℃; S200: Plasticized polycarbonate is injected into the mold for the first time via screw injection, wherein the injection volume of the first injection is controlled between 50% and 95%. S300: The mold closes at a pre-tuned speed to compress the polycarbonate. During this period, the polycarbonate is injected into the mold a second time through the screw injection until the cavity inside the mold is filled. The screw injection state is maintained to ensure the internal pressure of the mold. S400: Reduce the temperature inside the mold to below 140°C and push back the screw to recycle the remaining polycarbonate; S500: Open the mold and take out the aspherical ring-separated multifocal lens. Place the aspherical ring-separated multifocal lens in an air-conditioned room for pre-cooling, wherein the pre-cooling temperature is 16°C. S600: Place the pre-cooled aspherical ring-shaped multifocal lens into the first tank containing IPA solution for 68 seconds and the second tank containing curing solution for 30 seconds. S700: The aspherical ring-shaped multifocal lens after being immersed in liquid is placed in the baking oven for pre-baking and baking in sequence. The pre-baking temperature and time are 90℃ and 20 minutes, respectively, and the baking temperature is 125℃ and 3 hours. S800: The baked aspherical ring-shaped multifocal lens is placed in a cleaning tank for cleaning. The cleaned aspherical ring-shaped multifocal lens is then coated. The cleaning tank uses pure water with a quality of 13 megohms or higher. The coating consists of a first silica low-refractive film layer, a first zirconium oxide high-refractive film layer, a second silica low-refractive film layer, a second zirconium oxide high-refractive film layer, an ITO anti-electromagnetic wave film layer, a third silica low-refractive film layer, and a dustproof and anti-fog film layer, which are stacked in sequence. S900: After completing the above process steps, the product is sent for quality inspection to obtain the finished aspherical ring-separated multifocal lens.