Photochromic optical path difference regulation structure lens

Abstract

The utility model provides a photochromic optical path difference regulation structure lens, and relates to the optical lens field, the lens comprises an optical path difference regulation area, the optical path difference regulation area comprises a discrete signal area formed by a plurality of micro lenses arranged in a rectangular array and a continuous signal area formed by a plurality of girdle lenses arranged in a concentric girdle; the composite functional area comprises a photochromic area suitable for adjusting the color of the lens and an optical compensation area suitable for dynamically complementing with the change of the refractive index of the photochromic area. According to the myopia prevention and control lens, color change of the myopia prevention and control lens is achieved by arranging the composite functional area, the refractive index change generated by photochromism is dynamically offset through the optical compensation area, and the stability of the myopia prevention and control effect is guaranteed; discrete and continuous defocus signals are integrated in the optical path difference regulation and control area, the micro lenses arranged in a rectangular array provide denser defocus signals in the human eye movement direction, more eye movement of a photochromic lens user is adapted, and a better myopia prevention and control effect is achieved.

Description

Technical Field

[0001] This utility model relates to optical lenses, specifically to a photochromic optical path difference control structure lens. Background Technology

[0002] Myopia control lenses slow down the progression of myopia by incorporating specific optical areas on the lens. A common method is to use microlenses to generate defocus optical signals that slow myopia development. To meet the needs of outdoor visual comfort, photochromic lenses automatically adjust their color according to the intensity of ambient light, allowing for switching between sunglasses and regular glasses, providing the wearer with a better visual experience.

[0003] However, existing technologies have the following problems: First, photochromic materials undergo significant refractive index changes during color change, which disturbs the stability of the defocus signal and directly weakens the myopia control effect, making it difficult to combine photochromic technology with myopia control lenses. Second, some myopia control lenses use composite defocus signals, which have more complex optical structures and are more sensitive to refractive index fluctuations caused by photochromism. Finally, existing defocus structures mostly use ring-shaped microlenses, which provide insufficient stimulation in the directions of frequent horizontal and vertical eye movements, while wearers who need photochromic lenses often have more outdoor activities.

[0004] Based on this, this application proposes a photochromic optical path difference control structure lens in order to solve at least one of the aforementioned problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a photochromic optical path difference control structure lens, which solves the problems that current myopia control lenses cannot adapt to photochromism and have relatively simple optical signal control.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This application provides a photochromic optical path difference control structure lens, the lens comprising:

[0008] Optical path difference control zone: The optical path difference control zone is suitable for generating various defocus signals for myopia prevention and control.

[0009] The multi-functional area is used to adjust lens color.

[0010] The optical path difference control region and the composite functional region are stacked together. The optical path difference control region includes:

[0011] The discrete signal region is composed of multiple microlenses arranged in a rectangular array.

[0012] The continuous signal region is composed of multiple ring mirrors arranged in concentric rings;

[0013] The multifunctional area includes:

[0014] Photochromic zone, the photochromic zone is used to adjust the color of the lens;

[0015] The optical compensation zone is used to dynamically complement the refractive index change caused by photochromism in the photochromic zone, so as to maintain the stability of the composite defocus optical signal generated by the optical path difference control zone.

[0016] In a preferred embodiment, the microlens in the discrete signal region and the annular mirror in the continuous signal region partially overlap in the upward direction of the lens axis.

[0017] In a further preferred embodiment, the projection of the optical compensation region onto the lens axis covers the microstructure within the optical path difference control region.

[0018] In one embodiment, uniform doping of nanoparticles within the optical compensation region is suitable for increasing the rate of refractive index compensation.

[0019] In a preferred embodiment, the photochromic region is composed of spiropyran-based organic molecules uniformly dispersed in a polyurethane acrylate matrix.

[0020] In a further preferred embodiment, the optical compensation region is composed of a siloxane resin doped with nano-titanium dioxide particles.

[0021] In one embodiment, some microlenses have different defocusing amounts.

[0022] In a preferred embodiment, the defocusing amount of the multiple microlenses is set in a gradient from the center of the lens to the outer side.

[0023] In one embodiment, an optical region without microstructures is provided at the center of the optical path difference control region.

[0024] In a preferred embodiment, the outer edge of the discrete signal region is circular and does not exceed the outer edge of the continuous signal region.

[0025] In one embodiment, the lens further includes a protective layer disposed on the outermost side of the lens.

[0026] This invention provides a photochromic optical path difference control structure lens. Compared with the prior art, it has the following advantages:

[0027] This application achieves photochromic properties in myopia control lenses by setting up a composite functional area. The optical compensation area dynamically offsets the refractive index changes caused by photochromism, ensuring the stability of the myopia control effect. The optical path difference control area integrates discrete and continuous defocus signals. The rectangular array of microlenses provides denser defocus signals in the direction of human eye movement, adapting to more eye movements of photochromic lens users and achieving a better myopia control effect. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A front view of a photochromic optical path difference control structure lens provided in an embodiment of this application.

[0030] Figure 2 for Figure 1 Sectional view at point AA.

[0031] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0032] Figure 4 for Figure 2 Enlarged view of section C.

[0033] In the diagram: 1. Optical path difference control area; 2. Composite functional area; 3. Protective layer;

[0034] 11. Discrete signal region; 12. Continuous signal region; 21. Photochromic region; 22. Optical compensation region. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] This application provides a photochromic optical path difference control structure lens, which solves the problems of current myopia control lenses being unable to adapt to photochromism, having a single optical signal, and not matching the main movement direction of the human eye.

[0037] The technical solution in this application is to solve the aforementioned technical problems, and the overall approach is as follows:

[0038] First, since photochromic materials primarily rely on reversible isomerization reactions under specific wavelengths of light to achieve color changes, the process of adjusting color often significantly impacts optical parameters such as the refractive index and Abbe number of the lens. This, in turn, affects optical signals such as defocus signals generated in the myopia control optical area of ​​the lens, thus affecting the myopia control effect. Second, because different people have varying sensitivities to different defocus optical signals, existing technologies also include lenses that combine multiple defocus signals. These combined defocus optical signals are generated when light is affected by multiple microstructures in the lens, making them more sensitive to the refractive index signal caused by photochromism. Third, due to the varying range of human eye activity, most people primarily engage in lateral eye movements, especially those using photochromic lenses, who typically have frequent indoor / outdoor activities or driving needs, such as driving or outdoor sports, resulting in significant eye activity. Existing defocus microlens arrangements are mostly circular arrays simulating the shape of natural light, providing limited defocus signal intensity in the main directions of human eye activity (especially horizontal and vertical saccades). Therefore, there is a need for a lens that combines photochromic technology, provides a composite defocus signal, and sets a better defocus signal in the main direction of human eye movement.

[0039] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0040] Example 1:

[0041] See Figures 1-3 As shown, this application provides a photochromic optical path difference control structure lens, comprising: an optical path difference control region 1, which is suitable for generating multiple defocus signals for myopia control; and a composite function region 2, which is suitable for adjusting the lens color. The optical path difference control region 1 and the composite function region 2 are stacked. The optical path difference control region 1 includes: a discrete signal region 11, which is composed of multiple microlenses arranged in a rectangular array; and a continuous signal region 12, which is composed of multiple ring mirrors arranged in concentric rings. The composite function region 2 includes: a photochromic region 21, which is suitable for adjusting the lens color; and an optical compensation region 22, which is suitable for dynamically complementing the refractive index change caused by photochromism in the photochromic region 21, so as to maintain the stability of the composite defocus optical signal generated by the optical path difference control region 1.

[0042] In this embodiment, it should be noted that the lens itself has a refractive correction function configured according to the wearer's myopia, that is, a myopia lens that meets the wearer's visual needs; the discrete signal area 11 in the optical path difference control area 1 has multiple microlenses arranged in a rectangular array, that is, the row and column directions of the array are consistent with the horizontal and vertical directions of the wearer's line of sight when wearing glasses, so as to provide the wearer's eyes with higher density defocus signal stimulation in the main activity direction during the most frequent horizontal and vertical saccade movements of the human eye, in order to adapt to the outdoor sports vision needs of the main users of photochromic lenses; the ring lens in the continuous signal area 12 can provide the wearer with continuous defocus optical signals to meet the usage needs of wearers who are not sensitive to discrete optical signals.

[0043] The composite functional area 2 achieves photochromism through the photochromic area 21, and through the dynamic complementarity of the optical compensation area 22, it achieves color adaptive adjustment while maintaining the stability of the composite defocus optical signal generated by the optical path difference control area 1.

[0044] Specifically, the photochromic region 21 is constructed by dispersing specific photochromic molecules, including spiroxazine and naphthylpyran, in a suitable polymer material for lenses, such as polyurethane acrylate. The principle is that when photochromic molecules are excited by ambient light, typically ultraviolet light, they undergo a reversible change in molecular structure. This change is directly reflected in a significant red or blue shift in the material's absorption spectrum, which macroscopically manifests as the lens switching between colorless and dark colors. This principle allows a single lens to adapt to changes in ambient light intensity, eliminating the need for users to change glasses in different scenarios (such as changing sunglasses when entering the outdoors or driving), greatly improving convenience and visual comfort. This is also the main principle behind the vast majority of existing photochromic lenses.

[0045] The optical compensation region 22 utilizes a material matrix with a specific thermo-optic coefficient, which is a physical parameter characterizing the sensitivity of a material's refractive index to temperature changes. Generally, when photochromic molecules absorb light energy and undergo changes, their internal temperature rises, usually accompanied by an increase in refractive index, thus interfering with the defocus optical signal modulated by current defocus lenses and affecting myopia control effectiveness. This application selects materials with negative thermo-optic coefficient characteristics, including siloxane resins and epoxy resins. When these materials are subjected to heat transfer from the photochromic region 21 and ambient light irradiation, their refractive index decreases with temperature, thereby compensating for the increase in refractive index in the photochromic region 21. This ensures that the defocus signal generated by the optical path difference control region remains consistent and stable before and after the color change.

[0046] In a preferred embodiment, the microlens in the discrete signal region 11 and the annular lens in the continuous signal region 12 partially overlap in the upward direction of the lens axis.

[0047] In this embodiment, it should be noted that the partially overlapping discrete signal region 11 and continuous signal region 12 can be fabricated in a single micro-nano process (such as photolithography) in one molding process. The partially overlapping microlenses and annular lenses enable the discrete and continuous defocused signals to be visually blended more smoothly and naturally. When the human eye moves across the lens, it is not easy to perceive the hard boundary between the two signal regions, thereby improving visual comfort.

[0048] In a further preferred embodiment, the projection of the optical compensation region 22 onto the lens axis covers the microstructure within the optical path difference control region 1.

[0049] In this embodiment, it should be noted that the projection of the optical compensation area 22 on the lens axis covers the microstructure within the optical path difference control area 1. The purpose is to ensure that the refractive index change compensated by the optical compensation area 22 can completely cover the refractive index change caused by the color change of the photochromic area 21, so as to ensure the stability of the defocus signal generated by the optical path difference control area 1 on the lens.

[0050] Example 2:

[0051] A photochromic optical path difference control lens includes all the contents of Example 1 and its preferred embodiments. In addition, nanoparticles are uniformly doped in the optical compensation region 22, which is suitable for improving the rate of refractive index compensation.

[0052] In this embodiment, it should be noted that the nanoparticles can be titanium dioxide, tungsten oxide, zinc oxide, etc. These materials are uniformly doped into the matrix of the optical compensation region 22. They generally have strong ultraviolet absorption efficiency and thermal conductivity, and can absorb light transmitted through the lens, especially ultraviolet light, to raise the temperature, thereby improving the heat transfer efficiency of the optical compensation region 22, which is beneficial to improving the refractive index compensation rate. In addition, nanoparticles with strong ultraviolet absorption efficiency can slow down the photoaging of the lens and improve the weather resistance of the lens.

[0053] In a preferred embodiment, the photochromic region 21 is composed of spiropyran-based organic molecules uniformly dispersed in a polyurethane acrylate matrix.

[0054] In this embodiment, it should be noted that spiropyran organic molecules, as the main color-changing compounds in the photochromic region 21, can have various substituents introduced at different positions through chemical synthesis, thereby partially adjusting the range of refractive index changes and better adapting to the compensation modulation of the optical compensation layer. The introduction of substituents into spiropyran organic molecules can be found in technologies such as semiconductor lasers, chemical sensors, and photochromic lenses, and the principle will not be elaborated here. Polyurethane acrylate is also a common material in photochromic lenses. The main purpose of selecting this type of material is that it can be dissolved in the monomer along with the photochromic dye, and formed through processes such as injection, casting, and coating. It can also provide molecular ring mirrors for the color-changing reaction of photochromic molecules, and the specific principle will not be elaborated here.

[0055] In a further preferred embodiment, the optical compensation region 22 is composed of a siloxane resin doped with nano-titanium dioxide particles.

[0056] In this embodiment, it should be noted that the siloxane resin itself has a large thermo-optic coefficient, that is, the refractive index of the resin decreases significantly with increasing temperature. The nano-titanium dioxide particles have a high refractive index, which can ensure the rate of refractive index compensation. By precisely controlling the doping amount of the nano-titanium dioxide particles, the overall thermo-optic coefficient of the optical compensation region 22 can be finely controlled so that it can be matched with the refractive index change range of the photochromic layer.

[0057] Example 3:

[0058] A photochromic optical path difference control lens includes all the contents of Embodiments 1 to 2 and their preferred embodiments. In addition, some microlenses have different defocusing amounts.

[0059] In this embodiment, it should be noted that some microlenses 111 have different defocus amounts, meaning that the defocus amount of microlenses 111 can be set independently, thereby achieving more gradient and more directional differences in defocus signals. For example, the defocus amount can be set from the center of the lens to the periphery, or multiple sets of microlenses 111 with different defocus amount signals can be set for wearers to conduct wearing tests, so as to find the setting range most suitable for the protection needs of some wearers and improve the universality of this device.

[0060] In a preferred embodiment, the defocusing amount of the multiple microlenses is set in a gradient from the center of the lens to the outer side.

[0061] It should be noted that the defocus amount of the microlens is set in a gradient from the center to the outer edge of the lens, generally increasing progressively. For the human eye, the closer to the center of the retina (i.e., the macula), the denser the distribution of photoreceptor cells. Since the defocus signal is an optical signal that does not directly image onto the retina, increasing the defocus amount in the peripheral retinal area, while ensuring clear central vision, can provide a stronger defocus signal than a single defocus signal, thus improving myopia control.

[0062] Example 4:

[0063] A photochromic optical path difference control lens includes all the contents of Examples 1 to 3 and their preferred embodiments. In addition, the optical path difference control area 1 has an optical area without microstructures at its center.

[0064] In this embodiment, it should be noted that the optical path difference control area 1 has an optical area without microstructures at its center to ensure that the wearer's main field of vision is clear.

[0065] In a preferred embodiment, the outer edge of the discrete signal region 11 is circular and does not exceed the outer edge of the continuous signal region 12.

[0066] In this embodiment, it should be noted that the outer edge of the discrete signal region 11 is circular and does not exceed the outer edge of the continuous signal region 12. That is, the outermost microlenses of the microlens array in the discrete signal region 11 are arranged within the circular outer edge of the outermost annular lens of the continuous signal region 12. This arrangement avoids the sawtooth-like boundary generated by the outer edge of the rectangular array microlenses, making the outer edge of the optical path difference control region 1 a continuous circular boundary, thus improving the wearer's comfort.

[0067] Example 5:

[0068] A photochromic optical path difference control lens includes all the contents of Embodiments 1 to 3 and their preferred embodiments. In addition, the lens also includes a protective layer 3, which is disposed on the outermost side of the lens.

[0069] In this embodiment, it should be noted that the protective layer 3 can be prepared on the outer surface of the lens by processes such as dip coating, spin coating of the lens matrix or vacuum coating, and it can protect the optical path difference control area 1 and the composite functional area 2 on the inner side of the lens.

[0070] Protective layer 3 can be made of silane resin, which is photocured to form a high-hardness protective layer 3 to resist scratches during lens use; it can also be made of polyurethane or polycarbonate through spraying or other methods, utilizing the high toughness of these materials to resist impact. The above-mentioned materials for protective layer 3 can meet the outdoor activity needs of users who choose photochromic lenses. The above materials and their specific applications in lenses can be found in sports lenses and photochromic lenses, and are existing technologies, so their principles will not be elaborated here.

[0071] In summary, compared with existing technologies, it has the following beneficial effects:

[0072] 1. This application achieves photochromic properties of the myopia control lens by setting up a composite functional area, and the optical compensation area dynamically offsets the refractive index change caused by photochromism, thus ensuring the stability of the myopia control effect.

[0073] 2. This application integrates discrete and continuous defocus signals (the discrete signal area formed by the microlens array and the continuous signal area formed by the ring lens) through the optical path difference control area, which can adapt to users with different defocus signal sensitivities and provide a more comprehensive myopia control effect.

[0074] 3. This application provides a denser and more continuous defocus signal band in the horizontal and vertical directions where the human eye frequently moves by using microlenses arranged in a rectangular array. Compared with the traditional ring arrangement, it can better match the wearer's dynamic visual trajectory, thereby meeting the greater visual needs of photochromic lens users outdoors.

[0075] 4. By setting different defocus amounts of some microlenses and the shape of the outer edge of the discrete defocus area, this application makes the intensity of the defocus signal more consistent with the wearer's actual eye use, eliminates visual interference caused by irregular boundaries, provides wearers with more targeted myopia control products, and improves the wearer's visual comfort.

[0076] 5. This application provides scratch and impact protection to the microstructure and composite functional area of ​​the optical path difference control zone by adding a protective layer to the outermost part of the lens, thereby ensuring the long-term stability of the lens's optical performance, extending the lens's service life, and improving the product's durability.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0078] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A photochromic optical path difference control structure lens, characterized in that, The lens includes: Optical path difference control area (1), wherein the optical path difference control area (1) is suitable for generating a variety of defocus signals for myopia prevention and control; Composite functional area (2), wherein the composite functional area (2) is suitable for adjusting lens color; The optical path difference control region (1) and the composite functional region (2) are stacked together, and the optical path difference control region (1) includes: Discrete signal region (11), which is composed of multiple microlenses arranged in a rectangular array; A continuous signal region (12) is formed by multiple ring mirrors arranged in concentric rings; The composite functional area (2) includes: Photochromic region (21), wherein the photochromic region (21) is suitable for adjusting the color of the lens; Optical compensation region (22) is adapted to dynamically complement the refractive index change caused by photochromic region (21) to maintain the stability of composite defocus optical signal generated by optical path difference control region (1).

2. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The microlens in the discrete signal region (11) and the annular lens in the continuous signal region (12) partially overlap in the upward direction of the lens axis.

3. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The projection of the optical compensation area (22) onto the lens axis covers the microstructure within the optical path difference control area (1).

4. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The optical compensation region (22) is uniformly doped with nanoparticles, which is suitable for improving the rate of refractive index compensation.

5. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The photochromic region (21) is composed of spiropyran organic molecules uniformly dispersed in a polyurethane acrylate matrix.

6. The photochromic optical path difference control structure lens as described in claim 4, characterized in that, The optical compensation region (22) is composed of a siloxane resin doped with nano-titanium dioxide particles.

7. A photochromic optical path difference control structure lens as described in any one of claims 1 to 6, characterized in that, Some of the microlenses described have different defocusing amounts.

8. A photochromic optical path difference control structure lens as described in any one of claims 1 to 6, characterized in that, The optical path difference control region (1) has an optical region without microstructures at its center.

9. A photochromic optical path difference control structure lens as described in any one of claims 1 to 6, characterized in that, The outer edge of the discrete signal region (11) is circular and does not exceed the outer edge of the continuous signal region (12).

10. A photochromic optical path difference control structure lens as described in any one of claims 1 to 6, characterized in that, The lens also includes a protective layer (3), which is disposed on the outermost side of the lens.

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