Method of manufacturing an ophthalmic lens and ophthalmic lens

Abstract

A method of manufacturing an eyeglass lens, the method having: a step of preparing a lens base material having a hard coat film containing a resin formed on at least one main surface; and a step of forming protrusions, in which a plurality of protrusions in which at least one of the lens base material and the hard coat film is protruded are formed by irradiating the hard coat film with laser light.

Description

Technical Field

[0001] This invention relates to a method for manufacturing spectacle lenses and spectacle lenses themselves. Background Technology

[0002] Patent Document 1 describes a spectacle lens that inhibits the development of refractive errors such as myopia. Specifically, a tiny convex portion, for example, about 1 mm in diameter, is formed on the object-side surface (i.e., the convex surface) of the spectacle lens. In the spectacle lens, a light beam incident from the object-side surface typically exits from the eye-side surface and is focused onto the wearer's retina. On the other hand, the light beam passing through the aforementioned tiny convex portion is focused at a position closer to the object side (anterior side) than the wearer's retina. As a result, the development of myopia is inhibited.

[0003] In addition, Patent Document 2 describes a method for manufacturing a spectacle lens molding die having a recess for forming the aforementioned minute protrusions.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: U.S. Application Publication No. 2017 / 0131567

[0007] Patent Document 2: International Publication No. 2019 / 124353. Summary of the Invention

[0008] The problem the invention aims to solve

[0009] In the manufacturing method described in Patent Document 2, the use of a metal forming mold (hereinafter also referred to as a metal mold) limits the types of materials and designs for the lens substrate. Furthermore, due to the high manufacturing cost of metal molds, it is difficult to produce convex surfaces of various types of metal molds, and the limitation on the convex curve of the spectacle lens leads to limitations on the optical formulation of the spectacle lens.

[0010] One embodiment of the present invention aims to provide a technique for manufacturing spectacle lenses capable of inhibiting the progression of myopia without using a molding die with recesses.

[0011] Methods for solving problems

[0012] The first aspect of the present invention is a method for manufacturing spectacle lenses, the manufacturing method comprising:

[0013] A process for preparing a lens substrate, wherein a hard coating containing a resin is formed on at least one main surface of the lens substrate; and

[0014] In the process of forming raised portions, a laser is irradiated onto the hard coating film to form a plurality of raised portions on at least one of the lens substrate and the hard coating film.

[0015] The second aspect of the present invention is a method for manufacturing spectacle lenses according to the first aspect described above, wherein, in the process of forming the raised portion, the hard coating film is locally expanded by laser irradiation, thereby forming the raised portion.

[0016] The third aspect of the present invention is a method for manufacturing spectacle lenses according to the first aspect described above, wherein, in the process of forming the raised portion, the lens substrate is locally expanded by laser irradiation, thereby forming the raised portion.

[0017] The fourth aspect of the present invention is a method for manufacturing spectacle lenses, the method comprising:

[0018] The process of preparing a lens substrate containing resin; and

[0019] In the process of forming raised portions, a laser is irradiated onto the lens substrate to form a plurality of raised portions on the lens substrate.

[0020] The fifth aspect of the present invention is a method for manufacturing spectacle lenses according to the fourth aspect described above, the method further comprising: a step of forming a hard coating film on at least one main surface of the lens substrate including a raised portion of the lens substrate.

[0021] The sixth aspect of the present invention is a method for manufacturing spectacle lenses according to the fifth aspect described above, wherein the hard coating film comprises an ultraviolet-curable resin.

[0022] The seventh aspect of the present invention is a method for manufacturing spectacle lenses according to any one of the first to sixth aspects described above, wherein the laser is a CO2 laser.

[0023] The eighth aspect of the present invention is a method for manufacturing spectacle lenses according to any one of the first to seventh aspects described above, wherein the radiation intensity distribution of the laser is a Gaussian distribution.

[0024] The ninth aspect of the present invention is a method for manufacturing a spectacle lens according to any one of the first to eighth aspects described above, wherein, in the process of forming the raised portion, irradiation is performed by making the irradiation distance of the laser larger or smaller than the focal distance of the laser.

[0025] The tenth aspect of the present invention is a method for manufacturing an eyeglass lens according to any one of the first to ninth aspects described above, wherein the eyeglass lens is a myopia progression-inhibiting lens, and the raised portion has the property that a light beam passing through at least a portion of the raised portion is incident on the retina as diverging light.

[0026] The eleventh aspect of the present invention is an eyeglass lens, the eyeglass lens comprising:

[0027] A base that causes a light beam incident from the object-side surface to exit from the eye-side surface and converge onto the retina via the eyeball; and

[0028] The system comprises multiple raised portions, which are raised portions that are in contact with the base, and have the property that a light beam passing through at least a portion of the raised portions is incident on the retina as diverging light.

[0029] The spectacle lens comprises a lens substrate and a hard coating formed on the lens substrate.

[0030] The plurality of raised portions are formed by the surface bulges of the hard coating film.

[0031] The twelfth aspect of the present invention is an eyeglass lens, the eyeglass lens comprising:

[0032] A base that causes a light beam incident from the object-side surface to exit from the eye-side surface and converge onto the retina via the eyeball; and

[0033] The system comprises multiple raised portions, which are raised portions that are in contact with the base, and have the property that a light beam passing through at least a portion of the raised portions is incident on the retina as diverging light.

[0034] The spectacle lens comprises a lens substrate and a hard coating formed on the lens substrate.

[0035] The plurality of raised portions are formed by coating the surface bulges caused by the thermal expansion of the lens substrate with the hard coating film.

[0036] The thirteenth aspect of the present invention is an eyeglass lens according to the eleventh or twelfth aspect described above, wherein the eyeglass lens is a myopia progression inhibition lens, and the raised portion has the following configuration: a light beam passing through at least a portion of the raised portion converges before reaching the retina via the eyeball and is incident on the retina as diverging light.

[0037] The fourteenth aspect of the present invention is an eyeglass lens according to the eleventh or twelfth aspect described above, wherein the surface shape of the plurality of raised portions has a central recess.

[0038] The fifteenth aspect of the present invention is an eyeglass lens according to the eleventh or twelfth aspect described above, wherein the surface shape of the plurality of raised portions is a bell shape with a Gaussian distribution.

[0039] The sixteenth aspect of the present invention is an eyeglass lens according to the eleventh or twelfth aspect described above, wherein the surface shape of the plurality of raised portions is spherical.

[0040] Invention Effects

[0041] According to one embodiment of the present invention, a technique is provided that enables the manufacture of spectacle lenses capable of inhibiting the progression of myopia without using a molding die with a recess. Attached Figure Description

[0042] Figure 1 This is a plan view of the object-side surface of the spectacle lens 100 according to the first embodiment of the present invention.

[0043] Figure 2A A cross-sectional view illustrating an example of the surface shape of the raised portion 20 according to the first embodiment of the present invention.

[0044] Figure 2B A cross-sectional view illustrating an example of the surface shape of the raised portion 20 according to the first embodiment of the present invention.

[0045] Figure 2C A cross-sectional view illustrating an example of the surface shape of the raised portion 20 according to the first embodiment of the present invention.

[0046] Figure 3 This is a flowchart illustrating an example of a method for manufacturing a spectacle lens 100 according to a first embodiment of the present invention.

[0047] Figure 4 The diagram schematically illustrates the laser irradiation in the raised portion forming process S103 according to the first embodiment of the present invention.

[0048] Figure 5 A flowchart illustrating an example of a method for manufacturing a spectacle lens 100 according to a second embodiment of the present invention. Detailed Implementation

[0049] [Detailed Explanation of Embodiments of the Invention]

[0050] Next, an embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, the present invention is not limited to these illustrations, but is indicated by the patent claims, and is intended to include all modifications within the meaning and scope equivalent to the patent claims.

[0051] The spectacle lenses described in this specification have an object-side surface and an eye-side surface. The term "object-side surface" refers to the surface located on the object side when the wearer wears the eyeglasses containing the spectacle lenses, and the term "eye-side surface," conversely, refers to the surface located on the eye-side when the wearer wears the eyeglasses including the spectacle lenses. This relationship also applies to the lens substrate, which forms the base of the spectacle lenses. That is, the lens substrate also has an object-side surface and an eye-side surface.

[0052] Furthermore, in this specification, "A~B" refers to the numerical range of "A above and B below".

[0053] <First Embodiment of the Invention>

[0054] (1) Eyeglass lenses

[0055] Figure 1 This is a plan view of the object-side surface of the spectacle lens 100 according to this embodiment. The spectacle lens 100 of this embodiment includes a base 10 and a plurality of protrusions 20. The base 10 is configured such that a light beam incident from the object-side surface exits from the eyeball-side surface and converges on the retina via the eyeball. The plurality of protrusions 20 are configured to be in contact with the base 10 and have the property that light beams passing through at least a portion of the protrusions 20 are incident on the retina as diverging light. For example, it can be configured such that light beams passing through at least a portion of the protrusions 20 converge (at the object-side position relative to the retina) before reaching the retina via the eyeball and are incident on the retina as diverging light.

[0056] The base 10 has an optical surface determined based on the wearer's prescription. That is, the portion that corresponds to the first refractive region of Patent Document 1 is the part that achieves the refractive power prescribed by the wearer.

[0057] The raised portion 20 is at least a portion of the area where there is no light focusing at the focusing position generated by the base 10. The raised portion 20 is a raised portion, corresponding to the small protrusion in Patent Document 1. The spectacle lens 100 of this embodiment is the same as the spectacle lens described in Patent Document 1, and is a myopia progression inhibition lens. Similar to the small protrusion in Patent Document 1, the plurality of raised portions 20 in this embodiment can be formed on at least one of the object-side surface and the eyeball-side surface of the two main surfaces of the spectacle lens 100. In this embodiment, an example is shown where the plurality of raised portions 20 are provided only on the object-side surface (convex surface) of the spectacle lens 100.

[0058] The plurality of raised portions 20 may be configured, for example, in an island-like arrangement (i.e., separated from each other without being adjacent to one another). There are no particular limitations on the arrangement of the plurality of raised portions 20. In this embodiment, as... Figure 1As shown, an example is illustrated where each of the raised portions 20 is independently and discretely arranged such that the center of each raised portion 20 is a vertex of an equilateral triangle (hereinafter also referred to as an equilateral triangle arrangement). Furthermore, there is no particular limitation on the number of the plurality of raised portions 20 having on the spectacle lens 100.

[0059] As in patent document 1 Figure 1 As described in the document, a region without the raised portion 20 may be provided in the central portion of the spectacle lens 100, or as described in Figure 10 of Patent Document 1, a region without the raised portion 20 may be provided in the central portion of the spectacle lens 100. In this embodiment, as... Figure 1 As shown, an example is illustrated where a region without a raised portion 20 is provided in the central portion of the spectacle lens 100. Furthermore, in this specification, the term "central portion" of the spectacle lens 100 refers to the center (geometric center, optical center, or centering center) of the spectacle lens 100 and its vicinity. In this embodiment, an example is illustrated where the wearer's line of sight passes through the center of the lens when looking directly forward.

[0060] Figure 2A , Figure 2B and Figure 2C A cross-sectional view schematically illustrating an example of the surface shape of the raised portion 20. For example... Figure 2A As shown, the surface shape of the raised portion 20 may have a central recess, such as... Figure 2B As shown, it can be a bell shape with a Gaussian distribution (normal distribution curve), and as... Figure 2C As shown, the shape can be spherical. Furthermore, they can be mixed. In addition, in this specification, the term "bell shape with a Gaussian distribution" also includes shapes with curves that can approximate a Gaussian distribution. Furthermore, the term "spherical shape" includes not only shapes with a perfectly spherical surface, but also shapes with surfaces that can approximate a sphere.

[0061] The diameter D of the raised portion 20 is, for example, 0.6 to 2.0 mm, and the height h is, for example, 0.1 to 10 μm. Furthermore, the surface shape of the raised portion 20 is as follows: Figure 2A As shown, when there is a central recess, the depth d of the recess is, for example, 0.1 to 5 μm.

[0062] (2) Manufacturing method of spectacle lenses

[0063] Figure 3 This is a flowchart illustrating an example of a method for manufacturing the spectacle lens 100 according to this embodiment. Figure 3 As shown, the manufacturing method of the spectacle lens 100 in this embodiment includes, for example, a lens substrate forming process S101, a hard coating forming process S102, a raised portion forming process S103, and an anti-reflective film forming process S104.

[0064] (Lens substrate forming process S101)

[0065] The lens substrate forming process S101 is, for example, a process of forming a lens substrate by casting polymerization using a molding die such as a glass mold.

[0066] As the lens substrate, various lens substrates commonly used in eyeglass lenses can be used. The lens substrate can be, for example, a plastic lens substrate or a glass lens substrate. A glass lens substrate can be, for example, a lens substrate made of inorganic glass. From the viewpoint of being lightweight and not easily broken, a plastic lens substrate is preferred. Examples of plastic lens substrates include polyurethane resins obtained through reactions of styrene resins (primarily meth)acrylic resins), polycarbonate resins, allyl resins, diethylene glycol dicarbonate allyl ester resins (CR-39), vinyl resins, polyester resins, polyether resins, isocyanate compounds, and hydroxyl compounds such as diethylene glycol; thiourethane resins obtained by reacting isocyanate compounds and polyol compounds; and cured products (commonly referred to as transparent resins) of curable compositions containing (thio)epoxide compounds having one or more disulfide bonds within the molecule. The curable composition can be referred to as a polymeric composition. As the lens substrate, undyed lens substrates (colorless lenses) or dyed lens substrates (dyed lenses) can be used. There are no particular limitations on the thickness and diameter of the lens substrate. For example, the thickness (center wall thickness) can be approximately 1–30 mm, and the diameter can be approximately 50–100 mm. The refractive index of the lens substrate can be, for example, approximately 1.60–1.75. However, the refractive index of the lens substrate is not limited to this range, and even within this range, it can deviate slightly above or below it. In this invention and this specification, the term refractive index refers to the refractive index for light with a wavelength of 500 nm.

[0067] Here, in existing methods for manufacturing spectacle lenses to suppress myopia progression, a molding die with recesses for forming minute protrusions is used. However, in the lens substrate forming step S101 of this embodiment, a molding die with recesses is not required. This reduces the manufacturing cost of the spectacle lens 100. Furthermore, since it is not necessary to separately prepare molding dies adapted to the design of the minute protrusions, the molding die can be made versatile.

[0068] Furthermore, in existing methods for manufacturing spectacle lenses that suppress myopia progression, metal molds that undergo cutting are used to precisely process the recesses of the molding die for forming the tiny protrusions. However, in the lens substrate forming step S101 of this embodiment, processing the recesses for forming the tiny protrusions is unnecessary; therefore, molding dies such as glass molds can be used in addition to metal molds. Thus, a wide variety of lens substrate materials can be used. In other words, it can be said that the design freedom of the spectacle lens 100, which is a myopia progression suppression lens, can be increased. In particular, when using metal molds, there are concerns from a manufacturing perspective that the material of the lens substrate may be limited to polycarbonate resin. Specifically, for example, thermoplastic resins such as polycarbonate resin can be molded in a short time via injection molding, and mass production of lens substrates can be handled even without manufacturing a large number of expensive metal molds. However, polymeric resin materials other than polycarbonate resin (e.g., thermosetting resins) require reaction time, resulting in reduced productivity. Moreover, to eliminate this problem, a large number of expensive metal molds need to be manufactured for mass production of lens substrates. On the other hand, according to the present invention, the preparation of a metal mold is not required. Therefore, regardless of the material of the lens substrate, it can be manufactured efficiently without excessively increasing production costs. For example, when using resin materials such as high refractive index materials with a refractive index exceeding 1.60 (often thermosetting resins), the effects of the present invention are significantly obtained.

[0069] (Hard coating film formation process S102)

[0070] The hard coating forming process S102 is, for example, a process in which a hard coating containing resin is formed on at least one main surface (preferably on two main surfaces) of a lens substrate formed in the lens substrate forming process S101. Alternatively, it may be a lens substrate preparation process in which the lens substrate forming process S101 and the hard coating forming process S102 are combined to prepare a lens substrate on which a hard coating containing resin is formed on at least one main surface.

[0071] In the hard coating film forming process S102, there are no particular restrictions on the method of forming the hard coating film. For example, spin coating, dip coating, etc. can be used.

[0072] As a hard coating, examples include cured films formed by curing a curable composition containing a curable compound. Hard coatings contribute to improved durability of eyeglass lenses. A curable compound refers to a compound having curable functional groups, and a curable composition refers to a composition containing one or more curable compounds.

[0073] As a curable composition for forming a hard coating film, examples include curable compositions in which an organosilicon compound is included as the curable compound, and examples include curable compositions in which metal oxide particles are included together with the organosilicon compound. As an example of a curable composition capable of forming a hard coating film, the curable composition described in Japanese Patent Application Publication No. 63-10640 can be cited.

[0074] In addition, as a form of organosilicon compound, organosilicon compounds and their hydrolysates represented by the following general formula (I) can also be listed.

[0075] (R 1 ) a (R 3 ) b Si(OR 2 ) 4-(a+b) …(I)

[0076] In general formula (I), R 1 R indicates an organic group having glycidoxy, epoxy, vinyl, methacryloyloxy, acryloyloxy, mercapto, amino, phenyl, etc. 2 R represents an alkyl group having 1 to 4 carbon atoms, an acyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 10 carbon atoms. 3 It represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms, where a and b each represent 0 or 1.

[0077] By R 2 The alkyl group representing 1 to 4 carbon atoms is either straight-chain or branched; specific examples include methyl, ethyl, propyl, and butyl. As a group composed of R... 2 Acyl groups representing 1 to 4 carbon atoms, such as acetyl, propionyl, oleyl, and benzoyl, are examples. As a group composed of R... 2 This refers to aryl groups with 6 to 10 carbon atoms; examples include phenyl, xylyl, and tolyl. (The last part, "R," appears to be a typographical error and is left untranslated.) 3 The alkyl group representing 1 to 6 carbon atoms is either straight-chain or branched; specific examples include methyl, ethyl, propyl, butyl, pentyl, and hexyl. As a group composed of R... 3 The aryl group represented by the formula (I) has 6 to 10 carbon atoms, and examples include phenyl, xylyl, and tolyl. As a specific example of a compound represented by the general formula (I), the compound described in paragraph 0073 of Japanese Patent Application Publication No. 2007-077327 can be cited. Since organosilicon compounds represented by the general formula (I) have curable groups, a hard coating film can be formed by performing a curing process after coating.

[0078] Metal oxide particles can help adjust the refractive index and improve the hardness of the cured film. Specific examples of metal oxide particles include tungsten oxide (WO3), zinc oxide (ZnO), silicon oxide (SiO2), aluminum oxide (Al2O3), titanium oxide (TiO2), zirconium oxide (ZrO2), tin oxide (SnO2), beryllium oxide (BeO), and antimony oxide (Sb2O5), which can be used alone or in combination of two or more types. From the viewpoint of balancing scratch resistance and optical properties of the hard coating film, the particle size of the metal oxide particles is preferably in the range of 5 to 30 nm. Regarding the content of metal oxide particles in the curable composition, it can be appropriately set considering the refractive index and hardness of the formed hard coating film; typically, it can be set to about 5 to 80% by mass relative to the solid content of the curable composition. Furthermore, from the perspective of dispersibility in the hard coating film, colloidal particles are preferred.

[0079] In existing methods for manufacturing spectacle lenses to suppress myopia progression, a thin coating (e.g., less than 2 μm) is required to form a hard coating on a lens substrate with micro-protrusions to prevent the micro-protrusions from being embedded in the hard coating. However, in the hard coating formation step S102 of this embodiment, there are no particular limitations on the thickness of the hard coating to form a hard coating on a lens substrate without micro-protrusions (e.g., the thickness can be 0.1 to 100 μm). This increases the design freedom of the spectacle lens 100 as a myopia progression suppression lens. Specifically, by making the hard coating thickness 2 μm or more, the scratch resistance of the spectacle lens 100 can be improved. Furthermore, liquid pits do not appear around the micro-protrusions, and the risk of defocusing not being achieved as designed can be reduced.

[0080] (Step S103: Forming the raised portion)

[0081] The raised portion forming process S103 is, for example, a process in which a laser is irradiated onto a hard coating film formed in the hard coating film forming process S102, and a plurality of raised portions 20, which are formed on the hard coating film, are formed on the lens substrate and at least one of the hard coating film. The hard coating film contains resin, and therefore softens and expands locally by laser irradiation to form the raised portion 20. That is, the hard coating film formed on the lens substrate is thermally expanded by laser irradiation, the film thickness increases locally, and its surface bulges to form the raised portion 20. In other words, the raised portion 20 in this case is a product of the surface bulging of the hard coating film. In addition, if the lens substrate contains resin and the laser absorption is higher than that of the hard coating film, it is also considered that the lens substrate softens and expands, and the hard coating film protrudes to form the raised portion 20. In this case, the lens substrate is thermally expanded by laser irradiation, and the raised portion 20 is formed by coating the surface of the lens substrate with the hard coating film. That is, in this case, the raised portion 20 is formed by coating the surface bulge caused by the thermal expansion of the lens substrate with a hard coating film. In this embodiment, the case of hard coating film bulge will be mainly described.

[0082] The laser used in the raised portion forming process S103 is preferably a CO2 laser. By using a CO2 laser, the laser absorption rate in the hard coating film increases, making it easier to soften and expand the hard coating film, thus facilitating the formation of the raised portion 20. Alternatively, in the raised portion forming process S103, lasers other than CO2 lasers (e.g., infrared lasers, green lasers, ultraviolet lasers, etc.) can be used. In this case, it is preferable to coat the hard coating film with an absorber that readily absorbs laser light.

[0083] In the process of forming a raised portion S103, when forming a raised portion 20, a laser can be used to irradiate a fixed point, or an electric current scanner can be used to irradiate while scanning.

[0084] The laser radiation intensity distribution used in the raised portion forming process S103 is preferably a Gaussian distribution. This makes it easier to smoothly raise the edges of the raised portion 20, thus reducing the impact on the appearance of the spectacle lens 100. Furthermore, in the raised portion forming process S103, a beam shaper or similar device can be used to control the laser radiation intensity distribution.

[0085] Figure 4 This diagram schematically illustrates the laser irradiation process in the raised portion formation step S103. In the raised portion formation step S103, irradiation is preferably performed by making the distance between the laser irradiation device and the hard coating film (hereinafter referred to as irradiation distance a) larger or smaller than the focal distance f of the laser. That is, it is preferable to irradiate the hard coating film by shifting it from the focal position generated by the laser irradiation device to either a distant or near location. This allows control of the distribution of irradiation energy on the hard coating film, and adjustment of the size and shape of the raised portion 20. Figure 4The diagram illustrates a scenario where the irradiation distance *a* is greater than the focal distance *f*, and irradiation is performed by shifting the hard coating film further away from the focal point of the laser irradiation device. This allows for easy control of the diameter of the raised portion 20. Specifically, for example, it is preferable that the laser irradiation distance *a* is the laser focal distance *f* ± 0.1 to 30 mm.

[0086] In the process S103 of forming the raised portion, for example, the size and surface shape of the raised portion 20 can be controlled by adjusting the laser output, irradiation distance, irradiation time, and radiation intensity distribution. Specifically, for example, by making the radiation intensity distribution of the laser Gaussian, the surface shape of the raised portion 20 can be made into a Gaussian distribution. Figure 2B The bell shape shown has a Gaussian distribution. Furthermore, for example, by adjusting at least one of the laser output, irradiation distance, and irradiation time, the surface shape of the raised portion 20 can be made into... Figure 2A The surface shape shown has a central concave portion. It can be assumed that the softening of the hard coating occurs significantly near the center of the laser, and the hard coating dissolves, thus resulting in the surface shape with a central concave portion.

[0087] In existing methods for manufacturing spectacle lenses that inhibit myopia progression, a molding die with concave portions is used to form tiny protrusions. Therefore, the design of these tiny protrusions (defocusing force, size, shape, and arrangement) is limited by the design of the molding die. However, in the manufacturing method of the spectacle lens 100 of this embodiment, a molding die with concave portions is not required; the raised portion 20 (described later) is formed by laser processing. Therefore, the design of the raised portion 20 is not limited. Thus, even when using the same molding die, the design of the raised portion 20 can be flexibly varied. In other words, it can be said that the design freedom of the spectacle lens 100 as a myopia progression inhibition lens can be increased.

[0088] When using a lens substrate containing resin, in the raised portion forming process S103, the lens substrate softens and expands simultaneously with the hard coating film due to laser irradiation. In this case, in the hard coating film forming process S102, it is preferable to form a hard coating film having a coefficient of thermal expansion greater than that of the lens substrate. Therefore, even if the lens substrate softens and expands, the raised portion 20 can be formed stably.

[0089] (Antireflective film forming process S104)

[0090] The antireflective film forming step S104 is, for example, a step in which an antireflective film is formed on a hard coating film on which the raised portion 20 is formed in the raised portion forming step S103. In the antireflective film forming step S104, various coating films, such as water-repellent or hydrophilic antifouling films and anti-fog films, can be formed in addition to the antireflective film (or as an alternative). Known techniques can be used for forming these coating films. Furthermore, the antireflective film forming step S104 can also be omitted.

[0091] The anti-reflective film forming process S104 is preferably performed in a low-temperature environment of around 80 to 100 degrees Celsius. This reduces the risk of the raised portion 20 formed in the raised portion forming process S103 softening or deforming again.

[0092] The antireflective film (and the various coating films mentioned above) formed in the antireflective film forming process S104 is quite thin (for example, about 0.1 μm) compared to the height of the raised portion 20, which can reduce the risk of the raised portion 20 being buried through the antireflective film or the like.

[0093] Through the above processes, a spectacle lens 100 comprising a base 10 (the portion where the raised portion 20 is not formed in the raised portion forming process S103) and a plurality of raised portions 20 can be manufactured. Since the plurality of raised portions 20 have the property that light beams passing through at least a portion of the raised portions 20 are incident on the retina as diverging light, the spectacle lens 100 can suppress the progression of myopia. Therefore, the manufacturing method of the spectacle lens 100 of this embodiment can manufacture a spectacle lens 100 capable of suppressing the progression of myopia without using a molding die with a concave portion.

[0094] <Second Embodiment of the Invention>

[0095] Next, the second embodiment of the present invention will be described focusing on aspects that differ from the first embodiment. Elements that are substantially the same as those described in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted.

[0096] Figure 5 This is a flowchart illustrating an example of a method for manufacturing the spectacle lens 100 according to this embodiment. Figure 5 As shown, the manufacturing method of the spectacle lens 100 in this embodiment includes, for example, a lens substrate forming process S101, a raised portion forming process S103, a hard coating forming process S102, and an anti-reflective film forming process S104. Compared with the first embodiment, the order of the hard coating forming process S102 and the raised portion forming process S103 has been interchanged.

[0097] (Lens substrate forming process S101)

[0098] The lens substrate forming process S101 in this embodiment is similar to that in the first embodiment, which involves casting polymerization using a molding die such as a glass mold to form the lens substrate. However, in this embodiment, a plastic lens substrate containing resin is used as the lens substrate.

[0099] (Step S103: Forming the raised portion)

[0100] The raised portion forming process S103 in this embodiment is, for example, a process in which a laser is irradiated onto the lens substrate formed in the lens substrate forming process S101 to form a plurality of raised portions 20 on the lens substrate. In this embodiment, since the lens substrate contains resin, it can be assumed that the lens substrate is locally softened and expanded by laser irradiation, thereby forming the raised portions 20. Furthermore, the laser irradiation can be performed in the same manner as in the first embodiment.

[0101] (Hard coating film formation process S102)

[0102] The hard coating film forming process S102 of this embodiment is, for example, a process in which a hard coating film is formed on at least one main surface (preferably two main surfaces) of a lens substrate formed in the lens substrate forming process S101. In the hard coating film forming process S102 of this embodiment, a hard coating film containing resin is formed on at least one main surface of the lens substrate including the raised portion 20.

[0103] In the hard coating film forming process S102 of this embodiment, it is preferable to form a hard coating film containing a UV-curable resin (ultraviolet-curable resin). When a hard coating film containing a thermosetting resin is formed on a lens substrate where the raised portion 20 is formed, heating occurs during the curing of the hard coating film, causing the raised portion 20 to soften again and potentially deform. However, by forming a hard coating film containing a UV-curable resin, the hard coating film can be light-cured, thus reducing the risk of the raised portion 20 softening again and deforming.

[0104] In the process of forming the raised portion S103, during the formation of the raised portion Figure 2A In the case of the raised portion 20 shown, which has a surface shape with a central recess, a hard coating film can be formed in the hard coating film forming process S102 of this embodiment so that the recess of the raised portion 20 is embedded.

[0105] (Antireflective film forming process S104)

[0106] The antireflective film forming process S104 in this embodiment can be performed in the same way as in the first embodiment, so the description is omitted.

[0107] By employing the above-described process, a spectacle lens 100 comprising a base 10 and a plurality of raised portions 20 can be manufactured in the same manner as in the first embodiment. Therefore, the method for manufacturing the spectacle lens 100 of this embodiment can also manufacture a spectacle lens 100 capable of suppressing the progression of myopia without using a molding die with recesses.

[0108] <Other embodiments of the present invention>

[0109] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from its spirit.

[0110] For example, in the above embodiment, although the design of the plurality of raised portions 20 in the spectacle lens 100 has remained unchanged, the design of the plurality of raised portions 20 in the spectacle lens 100 can also be changed. Specifically, for example, the diameter D of the raised portion 20 can gradually increase from the center of the spectacle lens 100 to the periphery.

[0111] Example

[0112] The embodiments of the present invention will now be described. These embodiments are examples of the present invention, and the present invention is not limited to these embodiments.

[0113] (1) Preparation of lens substrate

[0114] First, a lens substrate with a hard coating formed on both main surfaces is prepared. A plastic lens substrate with a refractive index of 1.60 is used as the lens substrate. The hard coating is formed using a thermosetting coating agent.

[0115] (2) Formation of the raised portion 20

[0116] Next, the hard coating of the lens substrate prepared in (1) was irradiated with a CO2 laser to form multiple protrusions 20, thus producing samples 1 to 12. The CO2 laser used had a focal distance of 145 mm, an average output of 12 W, a peak wavelength of 10.6 μm, and a Gaussian radiation intensity distribution. When forming a protrusion 20, the CO2 laser was used for fixed-point irradiation for 50 to 200 milliseconds. The irradiation conditions (irradiation distance, output) for samples 1 to 12 are shown in Table 1. Furthermore, in Table 1, the irradiation distance is based on the focal distance of the CO2 laser (0 mm), and the output is based on the average output of the CO2 laser (100%).

[0117] (3) Shape measurement of the raised portion 20

[0118] The surface shape (diameter D, height h, and depth d of the recess) of the raised portion 20 (samples 1-12) formed in (2) was measured using a surface shape measuring instrument (Talysurf CCIMP-HSXL). The results are shown in Table 1. Furthermore, in the shape classification in Table 1, the... Figure 2A The one shown, marked A, has a central recess, while the one without a central recess (e.g.) Figure 2B The bell shape shown has a Gaussian distribution. Figure 2C The spherical shape shown is labeled B, and the mixture of A and B is labeled A~B.

[0119] Table 1

[0120]

[0121] As shown in Table 1, it can be confirmed that the size and surface shape of the raised portion 20 can be controlled by adjusting the laser irradiation conditions (irradiation distance, output). Therefore, it can be confirmed that by forming the raised portion 20 (described later) by laser processing without using a molding die with a recess, the design freedom of the spectacle lens 100, which is a myopia progression inhibition lens, can be increased.

[0122] Explanation of reference numerals in the attached figures

[0123] 10 base

[0124] 20 raised sections

[0125] 100 eyeglass lenses

[0126] S101 Lens substrate forming process

[0127] S102 Hard Coating Film Forming Process

[0128] S103 Raised Part Formation Process

[0129] S104 Anti-reflective film formation process.

Claims

1. A method for manufacturing an eyeglass lens, the method comprising: A process for preparing a lens substrate, wherein a hard coating containing a resin is formed on at least one main surface of the lens substrate; and In the process of forming raised portions, a laser is irradiated onto the hard coating film to form a plurality of raised portions on at least one of the lens substrate and the hard coating film. in, In the process of forming the raised portion, the hard coating film is locally expanded by laser irradiation, thereby forming the raised portion.

2. The method for manufacturing spectacle lenses according to claim 1, wherein, The laser is a CO2 laser.

3. The method for manufacturing spectacle lenses according to claim 1, wherein, The radiation intensity distribution of the laser is Gaussian.

4. The method for manufacturing spectacle lenses according to any one of claims 1 to 3, wherein, In the process of forming the raised portion, irradiation is performed by making the irradiation distance of the laser larger or smaller than the focal distance of the laser.

5. The method for manufacturing spectacle lenses according to any one of claims 1 to 3, wherein, The eyeglass lens is a myopia progression-inhibiting lens, and the raised portion has the property that a light beam passing through at least a portion of the raised portion is incident on the retina as diverging light.

6. A spectacle lens, the spectacle lens comprising: The base causes a light beam incident from the object-side surface to exit from the eye-side surface and converge on the retina via the eyeball; as well as Multiple raised portions, wherein the multiple raised portions are raised portions that are in contact with the base, and have the property that a light beam passing through at least a portion of each raised portion is incident on the retina as diverging light, and The spectacle lens comprises a lens substrate and a hard coating formed on the lens substrate. The plurality of raised portions are formed by the surface of the hard coating film bulging due to the local expansion of the hard coating film.

7. The spectacle lens according to claim 6, wherein, The eyeglass lens is a myopia progression-inhibiting lens, and the raised portion has the following configuration: light beams passing through at least a portion of the raised portion converge before reaching the retina via the eyeball and are incident on the retina as diverging light.

8. The spectacle lens according to claim 6, wherein, The surface shape of the plurality of raised portions has a central concave portion.

9. The spectacle lens according to claim 6, wherein, The surface shape of the plurality of raised portions is a bell shape with a Gaussian distribution.

10. The spectacle lens according to claim 6, wherein, The surface shape of the plurality of raised portions is spherical.

Images