A film-variable multi-point defocused spectacle lens and its preparation method

Abstract

The present invention relates to a membrane-changing multi-point defocus eyeglass lens and a preparation method thereof, comprising a rear surface protective film layer, a multi-point defocus substrate, a composite color-changing film layer, and a front surface protective film layer, which are sequentially arranged from the human eye side to the light incident side; the multi-point defocus substrate is sequentially arranged from the center to the edge as a central viewing area, a multi-point defocus area, and an edge viewing area; the front surface of the multi-point defocus area is provided with N circles of non-continuous, dot-shaped microlenses; the composite color-changing film layer is a sequentially spin-coated N+1-layer single-layer color-changing film, the first N layers of single-layer color-changing film sequentially covering each circle of microlenses, and the N+1th layer of single-layer color-changing film covering the entire front surface of the multi-point defocus substrate. The present invention adopts a membrane-changing color-changing composite multi-point defocusing function, which can not only intervene and adjust the problem of worsening myopia caused by compensatory elongation of the eye axis, but also prevent strong light from damaging the human eye, thereby achieving multiple protections for the human eye. It can be used in conjunction with atropine eye drops and can effectively alleviate adverse reactions such as photophobia caused by atropine eye drops.

Description

Technical Field

[0001] The present invention relates to the field of vision correction, in particular to a membrane-variable multi-point defocus spectacle lens and a preparation method thereof. Background Art

[0002] Focus falling in front of the retina is called myopic defocus, while focus falling behind the retina is called hyperopic defocus. Hyperopic defocus in the peripheral retina is one of the factors that contribute to the progression of myopia. In theory, modern medical treatments can correct the problem of myopia worsening due to compensatory axial lengthening.

[0003] Currently, the lenses on the market that can achieve this defocus adjustment effect mostly use the method of arranging multiple microlenses in the peripheral area of the optical center. Its main working principle is: when looking straight ahead and far away, the designed corrected vision is obtained through the optical center area where no microlenses are set; when the eyeball leaves the optical center area, the defocus degree brought by the microlens is used to adjust the object image on or in front of the retina.

[0004] At the same time, the mainstream prevention and control measures for myopia in adolescents also include the use of atropine eye drops, but the side effects of long-term use of atropine eye drops include adverse reactions such as photophobia; if they are in a state of photophobia for a long time, it will easily affect the enthusiasm of adolescents for outdoor sports, which will indirectly have an adverse impact on myopia prevention and control.

[0005] There are few defocused lenses with color-changing capabilities on the market, mainly due to the limitations of existing manufacturing processes. The introduction of color-changing functions can be used to prevent damage to the human eye caused by strong light, ultraviolet light, and glare, improve visual contrast and clarity under strong light, and when used with atropine eye drops, can also reduce the adverse effects of side effects such as photophobia, and have a certain effect on the prevention and control of myopia.

[0006] Existing film-changing photochromic lenses mostly use a spin coating process to prepare the color-changing layer; multi-point defocus lenses generally have raised microlenses on the surface. If the conventional process is used to spin-coat the color-changing film, the obstruction of the microlenses will cause operational difficulties and uneven film layers. Summary of the Invention

[0007] In order to solve the problems of the above-mentioned lens having a single function, the limited number of defocus lenses with color-changing capabilities, and the difficulty in coating color-changing films on multi-point defocus lenses, the present invention provides the following technical solutions:

[0008] A film-variable multi-point defocus eyeglass lens, comprising a rear surface protective film layer, a multi-point defocus substrate, a composite color-variable film layer, and a front surface protective film layer, which are arranged in sequence from the human eye side to the light incident side;

[0009] The rear surface protective film layer includes at least one hard coating layer;

[0010] A multi-point defocus substrate is sequentially arranged from the center to the edge into a central viewing area, a multi-point defocus area, and an edge viewing area; the front surface of the multi-point defocus area is provided with N circles of discontinuous, point-shaped microlenses, each circle of microlenses being arranged in a concentric annular array centered on the center of the lens, with microlenses in the same circle having the same height, and microlenses in different circles having heights gradually increasing from the center to the edge;

[0011] When looking straight ahead and looking far away, the designed corrected vision is achieved through the optical center area, which is devoid of microlenses. When the eyeball moves away from the optical center area, the defocus provided by the microlenses adjusts the image on or in front of the retina. The height of the microlenses increases with each circle. The further away from the central viewing area, the fewer layers of photochromic film cover the microlens surface, the slightly less photochromic depth, and the clearer the image. This can guide the wearer to see through the lens periphery, increase the range of eye movement, and significantly enhance the intervention and prevention of multiple defocus areas.

[0012] Composite color-changing film layer, spin-coated N+1 layers of single-layer color-changing film from the human eye side to the light incident side. The first N layers of single-layer color-changing film sequentially cover each circle of microlenses, and the N+1th layer of single-layer color-changing film covers the entire front surface of the multi-point defocus substrate;

[0013] As the single-layer color-changing film is stacked layer by layer and each circle of microlenses is covered circle by circle, the annular array of microlenses not only plays the role of existing defocus adjustment, but also plays the role of positioning the range and thickness of each single-layer color-changing film, which is conducive to the precise positioning of the spin coating process;

[0014] The front surface protective film layer includes at least one anti-reflection film and one hard coating. The anti-reflection film applied to the front surface eliminates reflected light from the front surface and increases light transmission. Furthermore, the anti-reflection film, when used in conjunction with the composite color-changing film layer, increases light transmission and speeds up the color-changing film.

[0015] Furthermore, the projected area of microlenses in different circles on the front surface of the multi-point defocus substrate gradually increases from the center to the edge. The closer to the edge of the multi-point defocus zone, that is, the further the eye deviates from the central viewing area, the larger the single-point defocus area and the wider the defocus adjustment range. Combined with the circle-by-circle increase in microlens height, this ensures a relatively consistent microlens curvature, avoiding wearer discomfort caused by excessive defocus variations due to a single increase in microlens height, and improving the lens's wearability.

[0016] Furthermore, the heights of the microlenses in different circles increase equidistantly from the center to the edge.

[0017] Furthermore, the thickness of each single-layer color-changing film in the first N layers is determined by the height of each corresponding circle of microlenses, and the coating area is determined by the area surrounded by the outer circle of each corresponding circle of microlenses. This means that each single-layer color-changing film has the same thickness, which simplifies film thickness control and reduces production difficulty.

[0018] A method for preparing a film-variable multi-point defocus lens comprises the following steps:

[0019] S1. Integral molding of multi-point defocus substrate: Fill the mold with the mixed lens material, place the filled mold in a curing oven, and perform a primary curing. The curing curve is 35°C for 5 hours, 40°C for 5 hours, 45°C for 3 hours, 50°C for 3 hours, 65°C for 2 hours, 80°C for 2 hours, and 95°C for 2 hours. Then, let it stand and cool to form a multi-point defocus substrate blank.

[0020] S2, demoulding the multi-point defocus substrate blank: removing the multi-point defocus substrate blank from the mold after the primary curing;

[0021] S3, trimming and cleaning: trimming and cleaning the demoulded multi-point defocus substrate blank to form a multi-point defocus substrate;

[0022] S4. Spin coating of composite color-changing film: Fix the multi-point defocus substrate to the spin coater, use annular partitions to sequentially place adjacent circles of microlenses to separate the microlenses, and use the spin coater to spin coat each single layer of color-changing film in sequence from the human eye side to the light incident side; during the spin coating of the first N layers of single-layer color-changing film, the lower end of the annular partition is always completely in contact with the multi-point defocus substrate; remove the annular partition before spin coating the single-layer color-changing film of the N+1 layer;

[0023] The annular partition plays the role of limiting the spin coating range and rotates synchronously with the spin coater.

[0024] S5, spin coating the rear surface protective film layer and the front surface protective film layer in sequence;

[0025] S6. Secondary curing: Place the coated lens in a curing oven with a curing temperature of 80-100°C and a curing time of 5-6 hours.

[0026] Furthermore, the annular partition is made of high-temperature resistant rubber material.

[0027] Furthermore, a plurality of mutually parallel annular grooves are provided in the lower middle portion of the inner ring of the annular partition for accommodating excess film liquid during the spin coating process to prevent the film liquid from colliding with the inner wall of the annular partition and solidifying to form burrs.

[0028] The beneficial effects of the present invention are:

[0029] 1. Multi-point defocus lenses combined with film-changing color function can not only intervene and adjust the problem of worsening myopia caused by compensatory lengthening of the eye axis, but also prevent strong light from damaging the human eye, thus achieving multiple protections for the human eye.

[0030] 2. It can be used together with atropine eye drops, which can effectively relieve the adverse reactions such as photophobia caused by atropine eye drops, indirectly increase the enthusiasm for participating in outdoor activities, and form an internal and external dual myopia prevention and control mechanism.

[0031] 3. The composite color-changing film layer combined with the micro-lens shape design can avoid problems such as difficulty in spin coating and uneven film thickness caused by the presence of micro-lenses; at the same time, it can guide the wearer to view objects in areas away from the central viewing area, thereby improving the actual prevention and control effect of multi-point defocus.

[0032] 4. The preparation method of the present invention is simple to operate and the film thickness is convenient to control. The composite color-changing film layer and the anti-reflection film layer work together to achieve a fast color-changing speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 , a schematic diagram of the main structure of the membrane-variable multi-point defocus lens of the present invention.

[0034] Figure 2 、 Figure 1 A magnified view of the area in the middle.

[0035] Figure 3 , a top view of the membrane-variable multi-point defocus lens of the present invention.

[0036] In the figure: 1. Back surface protective film layer; 2. Multi-point defocus substrate; 21. Central viewing area; 22. Multi-point defocus area; 221. Microlens; 23. Edge viewing area; 3. Composite color-changing film layer; 31. Single-layer color-changing film; 4. Front surface protective film layer; 41. Hard film; 42. Anti-reflection film.

[0037] The figure only illustrates the arrangement of micro lenses and does not limit the actual number of circles, size, and number of micro lenses per circle. DETAILED DESCRIPTION

[0038] The following is combined with Figures 1 to 3 The principles and features of the present invention are described, and the examples given are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and are not to exact scale, and are only used for the purpose of conveniently and clearly illustrating the embodiments of the present invention.

[0039] Example 1

[0040] A film-variable multi-point defocus eyeglass lens, comprising a rear surface protective film layer 1, a multi-point defocus substrate 2, a composite color-variable film layer 3, and a front surface protective film layer 4, which are arranged in sequence from the human eye side to the light incident side;

[0041] The rear surface protective film layer 1 is a hard film. In the actual production process, anti-fouling film, anti-fingerprint film, waterproof film, anti-fog film, etc. can be added according to the wearer's needs.

[0042] The multi-point defocus substrate 2 is sequentially arranged from the center to the edge as a central viewing area 21, a multi-point defocus area 22, and an edge viewing area 23. The front surface of the multi-point defocus area 22 is provided with seven circles of discontinuous, dot-shaped microlenses 221. Each circle of microlenses 221 is arranged in a concentric annular array centered on the center of the lens. The microlenses 221 in the same circle have the same height, while the heights of the microlenses 221 in different circles increase in equal steps from the center to the edge, namely 2μm, 4μm, 6μm, 8μm, 10μm, 12μm, and 14μm. The projected area of each circle of microlenses 221 on the front surface of the multi-point defocus substrate 2 is enlarged in proportion to its height.

[0043] The composite color-changing film layer 3 is spin-coated with 8 layers of single-layer color-changing films 31 in sequence from the human eye side to the light incident side. The first 7 layers of single-layer color-changing films 31 cover each circle of microlens 221 in sequence, and the 8th layer of single-layer color-changing film 31 covers the entire front surface of the multi-point defocus substrate 2; the thickness of each single-layer color-changing film 31 is 2μm, and the area surrounded by the outer circle of the corresponding circle of microlens 221 is the coating range.

[0044] The front surface protective film layer 4 includes an anti-reflection film 42 and a hard film 41. The front surface may also be provided with an anti-fouling film, an anti-fingerprint film, a waterproof film, an anti-fog film, etc. according to actual needs.

[0045] The method for preparing the above-mentioned film-variable multi-point defocus lens comprises the following steps:

[0046] S1. Integral molding of a multi-point defocus substrate 2: Fill the mold with the mixed lens material, place the filled mold in a curing oven, and perform a primary curing process. The curing curve is 35°C for 5 hours, 40°C for 5 hours, 45°C for 3 hours, 50°C for 3 hours, 65°C for 2 hours, 80°C for 2 hours, and 95°C for 2 hours. The mold is then allowed to cool to form a blank of the multi-point defocus substrate 2.

[0047] S2, demoulding the blank of the multi-point defocus substrate 2: removing the blank of the multi-point defocus substrate 2 after the primary curing from the mold;

[0048] S3, trimming and cleaning: trimming and cleaning the demoulded multi-point defocusing substrate 2 blank to form a multi-point defocusing substrate 2;

[0049] S4. Spin coating of the composite color-changing film layer 3: fix the multi-point defocus substrate 2 on the spin coater, use annular partitions to sequentially place them between adjacent circles of microlenses 221 to separate the microlenses 221, and cooperate with the spin coater to spin coat each single-layer color-changing film 31 from the human eye side to the light incident side; during the spin coating process of the first 7 layers of single-layer color-changing film 31, the lower end of the annular partition is always completely in contact with the multi-point defocus substrate 2; before the 8th layer of single-layer color-changing film 31 is spin coated, the annular partition is removed; in this embodiment, the annular partition is made of high-temperature resistant rubber material, which can avoid damage to the lens when pressed on the lens. The annular partition plays a role in limiting the spin coating range and rotates synchronously with the spin coater; and a number of annular grooves are provided in the lower middle part of the inner circle of the annular partition to accommodate excess film liquid during the spin coating process.

[0050] S5, spin coating the rear surface protection film layer 1 and the front surface protection film layer 4 in sequence;

[0051] S6. Secondary curing: Place the coated lens in a curing oven with a curing temperature of 80-100°C and a curing time of 5-6 hours.

[0052] The membrane-modified multi-point defocus lenses manufactured using the structure and method of the present invention can be used in conjunction with atropine eye drops. Different concentrations of atropine cause different photophobia reactions, and the thickness and number of color-changing film layers can be customized based on the actual concentration used. Furthermore, to prevent wearer discomfort caused by excessively different color change depths above each circle of microlenses 221, the thickness of the single-layer color-changing film 31 should be minimal, preferably 2 μm or less.

[0053] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-point defocus lens with a film-modified lens, characterized in that: It includes a rear surface protection film layer, a multi-point defocus substrate, a composite color-changing film layer, and a front surface protection film layer, which are arranged in sequence from the human eye side to the light incident side; The rear surface protective film layer includes at least one hard coating layer; A multi-point defocus substrate is sequentially arranged from the center to the edge into a central viewing area, a multi-point defocus area, and an edge viewing area; the front surface of the multi-point defocus area is provided with N circles of discontinuous, point-shaped microlenses, each circle of microlenses being arranged in a concentric annular array centered on the center of the lens, with microlenses in the same circle having the same height, and microlenses in different circles having heights gradually increasing from the center to the edge; Composite color-changing film layer, spin-coated N+1 layers of single-layer color-changing film from the human eye side to the light incident side. The first N layers of single-layer color-changing film sequentially cover each circle of microlenses, and the N+1th layer of single-layer color-changing film covers the entire front surface of the multi-point defocus substrate; The thickness of each single-layer color-changing film in the first N layers is the height of each corresponding circle of microlenses, and the area surrounded by the outer circle of each corresponding circle of microlenses is the coating range; The front surface protective film layer includes at least one anti-reflection film and one hard film.

2. The multi-point defocus lens according to claim 1, characterized in that: The projection areas of the microlenses in different circles on the front surface of the multi-point defocus substrate gradually increase from the center to the edge.

3. The multi-point defocus lens according to claim 1, wherein: The heights of the microlenses in different circles increase equidistantly from the center to the edge.

4. A method for preparing a film-variable multi-point defocus lens according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Integral molding of multi-point defocus substrate: Fill the mold with the mixed lens material, place the filled mold in a curing oven, and perform a primary curing. The curing curve is 35°C for 5 hours, 40°C for 5 hours, 45°C for 3 hours, 50°C for 3 hours, 65°C for 2 hours, 80°C for 2 hours, and 95°C for 2 hours. Then, let it stand and cool to form a multi-point defocus substrate blank. S2, demoulding the multi-point defocus substrate blank: removing the multi-point defocus substrate blank from the mold after the primary curing; S3, trimming and cleaning: trimming and cleaning the demoulded multi-point defocus substrate blank to form a multi-point defocus substrate; S4. Spin coating of composite color-changing film: Fix the multi-point defocus substrate to the spin coater, use annular partitions to sequentially place adjacent circles of microlenses to separate the microlenses, and use the spin coater to spin coat each single layer of color-changing film in sequence from the human eye side to the light incident side; during the spin coating of the first N layers of single-layer color-changing film, the lower end of the annular partition is always completely in contact with the multi-point defocus substrate; remove the annular partition before spin coating the single-layer color-changing film of the N+1 layer; S5, spin coating the rear surface protective film layer and the front surface protective film layer in sequence; S6. Secondary curing: Place the coated lens in a curing oven with a curing temperature of 80-100°C and a curing time of 5-6 hours.

5. The method for preparing a film-modified multi-point defocus lens according to claim 4, wherein: The annular partition is made of high-temperature resistant rubber material.

6. The method for preparing a film-modified multi-point defocus lens according to claim 4, wherein: A plurality of mutually parallel annular grooves are provided on the lower middle portion of the inner ring of the annular partition.

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