Eyeglass lens manufacturing method

Abstract

This eyeglass lens manufacturing method includes: a step for preparing a lens substrate on at least one main surface of which a hard-coat film containing resin is formed; and a raised section forming step in which laser light is projected onto the hard-coat layer to form a plurality of raised sections in which the lens substrate and / or the hard-coat film is caused to be raised up.

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing eyeglass lenses and to eyeglass lenses. [Background technology]

[0002] Patent Document 1 describes an eyeglass lens that suppresses the progression of refractive errors such as myopia. Specifically, a small spherical protrusion, for example, with a diameter of about 1 mm, is formed on the convex surface of the eyeglass lens that faces the object. Normally, in eyeglass lenses, the light beam that enters from the surface facing the object is emitted from the surface facing the eyeball and focuses on the wearer's retina. On the other hand, the light beam that passes through the above-mentioned small protrusion focuses closer to the object (in front of) the wearer's retina. As a result, the progression of myopia is suppressed.

[0003] Furthermore, Patent Document 2 describes a method for manufacturing an eyeglass lens mold having a recess for forming the above-mentioned minute protrusions. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567 [Patent Document 2] International Publication No. 2019 / 124353 [Overview of the project] [Problems that the invention aims to solve]

[0005] The manufacturing method described in Patent Document 2 has the problem that the material and design type of the lens substrate are limited because a metal mold (hereinafter also referred to as a mold) is used. In addition, because the manufacturing cost of the mold is high, it is difficult to prepare many types of convex surfaces for the mold, and the convex curve of the spectacle lens is limited, which limits the optical formulation of the spectacle lens.

[0006] One embodiment of the present invention aims to provide a technology that enables the manufacture of spectacle lenses capable of suppressing myopia progression without using a mold having a recess. [Means for solving the problem]

[0007] A first aspect of the present invention is: A step of preparing a lens substrate on which a hard coat film containing resin is formed on at least one main surface, A method for manufacturing eyeglass lenses, comprising a step of irradiating the hard coat film with a laser to form a plurality of raised portions on at least one of the lens substrate or the hard coat film.

[0008] A second aspect of the present invention is: The method for manufacturing eyeglass lenses according to the first embodiment is as follows: In the step of forming the raised portion, the hard coat film expands locally by laser irradiation to form the raised portion.

[0009] A third aspect of the present invention is: In the step of forming the raised portion, the lens substrate expands locally by laser irradiation to form the raised portion, which is the method for manufacturing eyeglass lenses according to the first embodiment.

[0010] A fourth aspect of the present invention is: The process of preparing a lens substrate containing resin, A method for manufacturing eyeglass lenses, comprising a step of irradiating the lens substrate with a laser to form a plurality of raised portions on the lens substrate.

[0011] A fifth aspect of the present invention is: The method for manufacturing eyeglass lenses according to the fourth embodiment further comprises the step of forming a hard coat film on at least one main surface of the lens substrate, which includes a raised portion of the lens substrate.

[0012] A sixth aspect of the present invention is: The hard coat film contains an ultraviolet curable resin, and is a method for manufacturing a spectacle lens according to the fifth aspect described above.

[0013] The seventh aspect of the present invention is The laser is a CO2 laser, and is a method for manufacturing a spectacle lens according to any one of the first to sixth aspects described above.

[0014] The eighth aspect of the present invention is The radiation intensity distribution of the laser is a Gaussian distribution, and is a method for manufacturing a spectacle lens according to any one of the first to seventh aspects described above.

[0015] The ninth aspect of the present invention is In the step of forming the raised portion, the irradiation distance of the laser is irradiated by making it larger or smaller than the focal length of the laser, and is a method for manufacturing a spectacle lens according to any one of the first to eighth aspects described above.

[0016] The tenth aspect of the present invention is The spectacle lens is a myopia progression inhibitory lens, The raised portion has a property that a light beam passing through at least a part of the raised portion enters the retina as divergent light, and is a method for manufacturing a spectacle lens according to any one of the first to ninth aspects described above.

[0017] The eleventh aspect of the present invention is A base portion that emits a light beam incident from the object side surface from the eyeball side surface and converges it on the retina through the eyeball, A raised portion in contact with the base portion, the raised portion having a plurality of raised portions having a property that a light beam passing through at least a part of the raised portion enters the retina as divergent light, and is a spectacle lens comprising: The spectacle lens includes a lens substrate and a hard coat film formed on the lens substrate, The plurality of raised portions are those in which the surface of the hard coat film is raised, and is a spectacle lens.

[0018] The twelfth aspect of the present invention is A base portion that directs a light beam incident from the object-side surface to the eye-side surface, and focuses it onto the retina via the eyeball, An eyeglass lens comprising: a plurality of raised portions in contact with the base portion, wherein a light beam passing through at least a part of the raised portion is incident on the retina as divergent light; The aforementioned spectacle lens includes a lens substrate and a hard coat film formed on the lens substrate. The aforementioned multiple raised portions are formed by covering the surface bulges caused by thermal expansion of the lens substrate with the hard coat film, thus forming an eyeglass lens.

[0019] A thirteenth aspect of the present invention is: The spectacle lens is a myopia progression suppression lens, and the raised portion has a configuration in which the light beam passing through at least a part of the raised portion converges before reaching the retina via the eyeball, and is incident on the retina as divergent light, as described in the 11th or 12th embodiment above.

[0020] A fourteenth aspect of the present invention is: The surface shape of the plurality of raised portions is that of an eyeglass lens according to the 11th or 12th embodiment, having a recess in the center.

[0021] A fifteenth aspect of the present invention is: The spectacle lens according to the 11th or 12th embodiment, wherein the surface shape of the plurality of raised portions is bell-shaped with a Gaussian distribution.

[0022] A sixteenth aspect of the present invention is: The spectacle lens according to the 11th or 12th embodiment, wherein the surface shape of the plurality of raised portions is spherical. [Effects of the Invention]

[0023] According to one embodiment of the present invention, it is possible to provide a technology that can manufacture spectacle lenses that can suppress the progression of myopia without using a mold having a recess. [Brief explanation of the drawing]

[0024] [Figure 1] Figure 1 is a plan view of the object-side surface of the eyeglass lens 100 according to the first embodiment of the present invention. [Figure 2A] Figure 2A is a schematic cross-sectional view showing an example of the surface shape of the raised portion 20 according to the first embodiment of the present invention. [Figure 2B] Figure 2B is a schematic cross-sectional view showing an example of the surface shape of the raised portion 20 according to the first embodiment of the present invention. [Figure 2C] Figure 2C is a schematic cross-sectional view showing an example of the surface shape of the raised portion 20 according to the first embodiment of the present invention. [Figure 3] Figure 3 is a flowchart showing an example of a method for manufacturing an eyeglass lens 100 according to the first embodiment of the present invention. [Figure 4] Figure 4 is a schematic diagram showing the laser irradiation process in step S103 of the raised portion formation process according to the first embodiment of the present invention. [Figure 5] Figure 5 is a flowchart showing an example of a method for manufacturing an eyeglass lens 100 according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0025] [Details of the Embodiments of the Invention] Next, one embodiment of the present invention will be described below with reference to the drawings. However, the present invention is not limited to these examples and is intended to include all modifications within the meaning and scope equivalent to the claims as shown in the claims.

[0026] The spectacle lenses described herein have an object-facing surface and an eye-facing surface. The "object-facing surface" is the surface that faces the object when the spectacle lenses are worn by the wearer, and the "eye-facing surface" is the opposite surface, that is, the surface that faces the eye when the spectacle lenses are worn by the wearer. This relationship also applies to the lens substrate that forms the basis of the spectacle lenses. In other words, the lens substrate also has an object-facing surface and an eye-facing surface.

[0027] In this specification, "A to B" means a numerical range of "A or greater and B or less".

[0028] <First Embodiment of the Invention> (1) Eyeglass lenses Figure 1 is a plan view of the object-side surface of the eyeglass lens 100 of this embodiment. The eyeglass lens 100 of this embodiment comprises a base portion 10 and a plurality of raised portions 20. The base portion 10 is configured to cause a light beam incident from the object-side surface to exit from the eyeball-side surface and converge onto the retina via the eyeball. The plurality of raised portions 20 are in contact with the base portion 10 and are configured such that a light beam passing through at least a portion of the raised portions 20 is incident on the retina as divergent light. For example, a light beam passing through at least a portion of the raised portions 20 can be configured to converge before reaching the retina (at a position closer to the object than the retina) via the eyeball and be incident on the retina as divergent light.

[0029] The base portion 10 has an optical surface determined based on the wearer's prescription. That is, it is the part with a shape that can realize the wearer's prescribed refractive power, and it corresponds to the first refractive region of Patent Document 1.

[0030] The raised portion 20 is a region in which at least a part of the area is not focused to the light-gathering position of the base portion 10. The raised portion 20 is a raised-shaped part and corresponds to the minute protrusion in Patent Document 1. The spectacle lens 100 of this embodiment is a myopia progression suppressing lens, similar to the spectacle lens described in Patent Document 1. Similar to the minute protrusion in Patent Document 1, the multiple raised portions 20 of this embodiment only need to be formed on at least one of the two main surfaces of the spectacle lens 100, either the surface facing the object or the surface facing the eyeball. In this embodiment, an example is given in which the multiple raised portions 20 are provided only on the surface facing the object (convex surface) of the spectacle lens 100.

[0031] The multiple raised portions 20 are arranged, for example, in an island-like manner (that is, spaced apart from each other without being adjacent). The arrangement of the multiple raised portions 20 is not particularly limited. In this embodiment, as shown in Figure 1, an example is given where each raised portion 20 is independently and discretely arranged such that its center forms the vertex of an equilateral triangle (hereinafter also referred to as an equilateral triangle arrangement). The number of multiple raised portions 20 provided on the spectacle lens 100 is not particularly limited.

[0032] As shown in Figure 1 of Patent Document 1, a region without a raised portion 20 may be provided in the central part of the spectacle lens 100, or as shown in Figure 10 of Patent Document 1, a region without a raised portion 20 may not be provided in the central part of the spectacle lens 100. In this embodiment, as shown in Figure 1, a case in which a region without a raised portion 20 is provided in the central part of the spectacle lens 100 is illustrated. In this specification, the central part of the spectacle lens 100 means the lens center (geometric center, optical center, or centering center) of the spectacle lens 100 and its vicinity. In this embodiment, a case in which the line of sight of the wearer of the spectacle lens 100 when looking straight ahead is illustrated.

[0033] Figures 2A, 2B, and 2C are schematic cross-sectional views showing examples of the surface shape of the raised portion 20. The surface shape of the raised portion 20 may have a recess in the center, as shown in Figure 2A; it may be a bell shape having a Gaussian distribution (normal distribution curve), as shown in Figure 2B; or it may be a spherical shape, as shown in Figure 2C. Furthermore, a mixture of these shapes is also permitted. In this specification, a bell shape having a Gaussian distribution includes shapes having a curve that can approximate a Gaussian distribution. A spherical shape includes not only shapes with a perfect sphere surface, but also shapes whose surface can approximate a sphere.

[0034] 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, if the surface shape of the raised portion 20 has a recess in the center, as shown in Figure 2A, the depth d of the recess is, for example, 0.1 to 5 μm.

[0035] (2) Method for manufacturing eyeglass lenses Figure 3 is a flowchart showing an example of a method for manufacturing the eyeglass lens 100 of this embodiment. As shown in Figure 3, the method for manufacturing the eyeglass lens 100 of this embodiment includes, for example, a lens substrate formation step S101, a hard coat film formation step S102, a raised portion formation step S103, and an anti-reflective film formation step S104.

[0036] (Lens substrate formation process S101) The lens substrate formation step S101 is a step in which a lens substrate is formed by casting polymerization using a mold such as a glass mold.

[0037] Various lens substrates commonly used for eyeglass lenses can be used as lens substrates. The lens substrate may be, for example, a plastic lens substrate or a glass lens substrate. The glass lens substrate may be, for example, a lens substrate made of inorganic glass. As a lens substrate, a plastic lens substrate is preferred from the viewpoint of being lightweight and less prone to breakage. Examples of plastic lens substrates include styrene resins such as (meth)acrylic resin, polycarbonate resin, allyl resin, allyl carbonate resin such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resin, polyester resin, polyether resin, urethane resin obtained by the reaction of an isocyanate compound with a hydroxyl compound such as diethylene glycol, thiourethane resin obtained by the reaction of an isocyanate compound with a polythiol compound, and cured products (generally called transparent resins) obtained by curing a curable composition containing a (thio)epoxy compound having one or more disulfide bonds in the molecule. The curable composition may also be called a polymerizable composition. As a lens substrate, an undyed one (colorless lens) or a dyed one (dyed lens) may be used. The thickness and diameter of the lens substrate are not particularly limited, but for example, the thickness (center thickness) may be about 1 to 30 mm, and the diameter may be about 50 to 100 mm. The refractive index of the lens substrate may be, for example, about 1.60 to 1.75. However, the refractive index of the lens substrate is not limited to this range, and may be within this range or outside of it. In the present invention and this specification, refractive index refers to the refractive index for light with a wavelength of 500 nm.

[0038] In conventional methods for manufacturing spectacle lenses that suppress myopia progression, a mold having a recess for forming micro-protrusions was used. In contrast, in the lens substrate forming step S101 of this embodiment, it is not necessary to use a mold having a recess. This reduces the manufacturing cost of the spectacle lens 100. Furthermore, it is not necessary to prepare separate molds for each design of the micro-protrusions, allowing for greater versatility in the mold.

[0039] Furthermore, in conventional methods for manufacturing spectacle lenses that suppress myopia progression, a mold with machining was used to accurately process the recesses in the mold for forming the micro-protrusions. In contrast, in the lens substrate formation step S101 of this embodiment, there is no need to process the recesses for forming the micro-protrusions, so in addition to molds, molds such as glass molds can also be used. Therefore, it becomes possible to use a wide variety of lens substrate materials as described above. In other words, it can be said that the design freedom of the spectacle lens 100, which is a myopia progression suppressing lens, can be improved. In particular, when a mold is used, there is a concern that the material of the lens substrate will be limited to polycarbonate resin due to manufacturing problems. Specifically, for example, thermoplastic resins such as polycarbonate resin can be molded in a short time by injection molding, and it is possible to mass-produce lens substrates without preparing many expensive molds. However, polymerization type resin materials other than polycarbonate resin (for example, thermosetting resins) take a long time to react, so productivity decreases. And in order to solve this problem and respond to mass production of lens substrates, it is necessary to prepare many expensive molds. On the other hand, according to the present invention, the preparation of a mold is unnecessary. Therefore, regardless of the material of the lens substrate, it becomes possible to manufacture the product efficiently and without increasing production costs. For example, the effects of the present invention are particularly evident when using resin materials such as high refractive index materials with a refractive index of more than 1.60 (often thermosetting resins).

[0040] (Hard coat film formation process S102) The hard coat film formation step S102 is a step of forming a hard coat film containing resin on at least one main surface (preferably both main surfaces) of the lens substrate formed in the lens substrate formation step S101. Alternatively, the lens substrate formation step S101 and the hard coat film formation step S102 may be combined to form a lens substrate preparation step, which prepares a lens substrate on which a hard coat film containing resin has been formed on at least one main surface.

[0041] In the hard coat film forming step S102, the method for forming the hard coat film is not particularly limited, and for example, a spin coating method, a dipping method, or the like can be used.

[0042] Examples of the hard coat film include a cured film formed by curing a curable composition containing a curable compound. The hard coat film contributes to improving the durability of the spectacle lens. The curable compound means a compound having a curable functional group, and the curable composition means a composition containing one or more curable compounds.

[0043] Examples of the curable composition for forming the hard coat film include a curable composition containing an organosilicon compound as the curable compound, and a curable composition containing metal oxide particles together with the organosilicon compound. An example of the curable composition capable of forming the hard coat film is the curable composition described in JP-A-63-10640.

[0044] In addition, as one aspect of the organosilicon compound, an organosilicon compound represented by the following general formula (I) and its hydrolyzate can also be mentioned. (R 1 ) a (R 3 ) b Si(OR 2 ) 4-(a+b) ···(I)

[0045] In the general formula (I), R 1 represents an organic group having a glycidoxy group, an epoxy group, a vinyl group, a methacryloxy group, an acryloxy group, a mercapto group, an amino group, a phenyl group, etc., R 2 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, R 3 represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms, and a and b each represent 0 or 1.

[0046] R 2The alkyl group having 1 to 4 carbon atoms represented by is a linear or branched alkyl group, and specific examples include the methyl group, ethyl group, propyl group, and butyl group. 2 Examples of acyl groups with 1 to 4 carbon atoms represented by include acetyl, propionyl, oleyl, and benzoyl groups. 2 Examples of aryl groups with 6 to 10 carbon atoms represented by R include phenyl groups, xylyl groups, tolyl groups, etc. 3 The alkyl group having 1 to 6 carbon atoms represented by is a linear or branched alkyl group, and specific examples include methyl, ethyl, propyl, butyl, pentyl, and hexyl groups. 3 Examples of aryl groups having 6 to 10 carbon atoms represented by this formula include phenyl groups, xylyl groups, and tolyl groups. Specific examples of compounds represented by general formula (I) include those described in paragraph 0073 of Japanese Patent Publication No. 2007-077327. Since organosilicon compounds represented by general formula (I) have curable groups, a hard coat film can be formed by curing treatment after coating.

[0047] Metal oxide particles can contribute to adjusting the refractive index and improving 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). These can be used individually or in combination of two or more metal oxide particles. The particle size of the metal oxide particles is preferably in the range of 5 to 30 nm, from the viewpoint of achieving both scratch resistance and optical properties of the hard coat film. The content of metal oxide particles in the curable composition can be appropriately set considering the refractive index and hardness of the formed hard coat film, and is usually about 5 to 80% by mass per solid content of the curable composition. Furthermore, the metal oxide particles are preferably colloidal particles from the viewpoint of dispersibility in the hard coat film.

[0048] In conventional methods for manufacturing spectacle lenses that suppress myopia progression, a hard coat film is formed on a lens substrate with micro-protrusions. Therefore, the thickness of the hard coat film must be thin (for example, less than 2 μm) to prevent the micro-protrusions from being obscured by the hard coat film. In contrast, in the hard coat film formation step S102 of this embodiment, the hard coat film is formed on a lens substrate without micro-protrusions. Therefore, there are no particular restrictions on the thickness of the hard coat film (for example, the thickness of the hard coat film may be 0.1 to 100 μm). In other words, the design freedom of the spectacle lens 100, which is a myopia progression suppression lens, can be improved. In particular, by making the thickness of the hard coat film 2 μm or more, the scratch resistance of the spectacle lens 100 can be improved. Furthermore, liquid accumulation around the micro-protrusions is avoided, reducing the risk of not achieving the desired defocus.

[0049] (Protuberance formation step S103) The raised portion formation step S103 is a step in which a laser is irradiated onto the hard coat film formed in the hard coat film formation step S102, for example, to form a plurality of raised portions 20 on the hard coat film, where at least one of the lens substrate or the hard coat film is raised. Since the hard coat film contains resin, it may soften and expand locally due to laser irradiation, thereby forming the raised portions 20. That is, the hard coat film formed on the lens substrate expands due to laser irradiation, increasing its thickness locally, and its surface becomes raised, forming the raised portions 20. In other words, the raised portions 20 in this case are raised surfaces of the hard coat film. Furthermore, if the lens substrate contains resin and has a higher laser absorption rate than the hard coat film, it is also possible that the lens substrate softens and expands, pushing up the hard coat film and forming the raised portions 20. In this case, the lens substrate expands due to laser irradiation, and the hard coat film covers the raised areas on the surface of the lens substrate, thus forming the raised portions 20. In other words, the raised portion 20 in this case is formed by covering the surface bulge caused by thermal expansion of the lens substrate with a hard coat film. This embodiment mainly describes the case where the hard coat film bulges.

[0050] In the raised portion formation step S103, it is preferable to use a CO2 laser. Using a CO2 laser increases the absorption rate of the laser by the hard coat film, making it easier to soften and expand the hard coat film, thus facilitating the formation of the raised portion 20. In addition, other lasers (e.g., infrared lasers, green lasers, ultraviolet lasers, etc.) may be used in the raised portion formation step S103. In this case, it is preferable to apply an absorbent to the hard coat film to facilitate laser absorption.

[0051] In the raised portion formation step S103, when forming one raised portion 20, the laser may be irradiated at a fixed point, or it may be irradiated while scanning using a galvanometer scanner or the like.

[0052] In the raised portion formation step S103, the radiation intensity distribution of the laser is preferably a Gaussian distribution. This makes it easier to create a smooth edge for the raised portion 20, thereby reducing the impact of the raised portion 20 on the view through the eyeglass lens 100. In addition, in the raised portion formation step S103, the radiation intensity distribution of the laser may be controlled using a beam shaper or the like.

[0053] Figure 4 is a schematic diagram showing the laser irradiation in the raised portion formation step S103. In the raised portion formation step S103, it is preferable to irradiate the hard coat film at a distance greater than or less than the laser's focal length f. That is, it is preferable to irradiate the hard coat film by shifting it to either farther away from or closer to the focus position of the laser irradiation device. This allows for control of the distribution of irradiation energy on the hard coat film and adjustment of the size and shape of the raised portion 20. Figure 4 shows the case where the irradiation distance a is greater than the focal length f, and the hard coat film is irradiated by shifting it to the farther side from the focus position of the laser irradiation device. This makes it easier to control the diameter of the raised portion 20. Specifically, for example, it is preferable to set the laser irradiation distance a to the laser's focal length f ± 0.1 to 30 mm.

[0054] In the raised portion formation step S103, the size and surface shape of the raised portion 20 can be controlled by adjusting, for example, the laser output, irradiation distance, irradiation time, and radiation intensity distribution. Specifically, for example, by setting the laser radiation intensity distribution to a Gaussian distribution, the surface shape of the raised portion 20 can be made into a bell shape with a Gaussian distribution, as shown in Figure 2B. Alternatively, 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 a surface shape with a depression in the center, as shown in Figure 2A. This is thought to be because the softening of the hard coat film progresses significantly near the center of the laser, causing the hard coat film to dissolve, resulting in a surface shape with a depression in the center.

[0055] In conventional methods for manufacturing eyeglass lenses that suppress myopia progression, a mold with a recess was used to form a micro-protrusion, thus limiting the design of the micro-protrusion (defocus power, size, shape, arrangement, etc.) by the design of the mold. In contrast, in the manufacturing method of the eyeglass lens 100 of this embodiment, the raised portion 20 is formed retrofitted by laser processing without using a mold with a recess, so the design of the raised portion 20 is not limited. Therefore, even when using the same mold, the design of the raised portion 20 can be flexibly changed. In other words, it can be said that the degree of freedom in designing the eyeglass lens 100, which is a myopia progression suppressing lens, can be improved.

[0056] When a lens substrate containing resin is used, in the raised portion formation step S103, the lens substrate may soften and expand simultaneously with the hard coat film due to laser irradiation. In this case, it is preferable to form a hard coat film with a coefficient of thermal expansion greater than that of the lens substrate in the hard coat film formation step S102. This ensures that the raised portion 20 can be stably formed even if the lens substrate softens and expands.

[0057] (Anti-reflection film formation step S104) The anti-reflective film formation step S104 is a step of forming an anti-reflective film on a hard coat film on which raised portions 20 have been formed in the raised portion formation step S103, for example. In the anti-reflective film formation step S104, in addition to (or instead of) the anti-reflective film, various coatings such as a water-repellent or hydrophilic anti-fouling film or an anti-fogging film may be formed. Known techniques can be applied to the method of forming these coatings. Note that the anti-reflective film formation step S104 may be omitted.

[0058] The anti-reflective film formation step S104 is preferably carried out in a low-temperature environment of approximately 80 to 100 degrees Celsius. This reduces the risk of the raised portion 20 formed in the raised portion formation step S103 softening again and undergoing deformation.

[0059] The anti-reflective film (and the various coatings mentioned above) formed in the anti-reflective film formation step S104 is considerably thinner (for example, about 0.1 μm) than the height of the raised portion 20, thus reducing the risk of the raised portion 20 being buried by the anti-reflective film, etc.

[0060] Through the above process, an eyeglass lens 100 can be manufactured, comprising a base portion 10 (the portion where the raised portion 20 was not formed in the raised portion formation step S103) and a plurality of raised portions 20. 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 divergent light, the eyeglass lens 100 can suppress the progression of myopia. Therefore, the manufacturing method of the eyeglass lens 100 in this embodiment makes it possible to manufacture an eyeglass lens 100 that can suppress the progression of myopia without using a mold having a recess.

[0061] <Second Embodiment of the Present Invention> Next, a second embodiment of the present invention will be described, focusing on the differences from the first embodiment. Elements that are substantially the same as those described in the first embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0062] Figure 5 is a flowchart showing an example of a method for manufacturing the eyeglass lens 100 of this embodiment. As shown in Figure 5, the method for manufacturing the eyeglass lens 100 of this embodiment includes, for example, a lens substrate formation step S101, a raised portion formation step S103, a hard coat film formation step S102, and an anti-reflective film formation step S104. The order of the hard coat film formation step S102 and the raised portion formation step S103 is reversed compared to the first embodiment.

[0063] (Lens substrate formation process S101) The lens substrate formation step S101 of this embodiment is a step of forming a lens substrate by casting polymerization using a mold such as a glass mold, similar to the first embodiment. However, in this embodiment, a plastic lens substrate containing resin is used as the lens substrate.

[0064] (Protuberance formation step S103) In this embodiment, the raised portion formation step S103 is a step in which a laser is irradiated onto the lens substrate formed in the lens substrate formation step S101, for example, to form a plurality of raised portions 20 on the lens substrate. In this embodiment, since the lens substrate contains resin, it is thought that the raised portions 20 are formed by the local softening and expansion of the lens substrate due to laser irradiation. The laser irradiation can be performed in the same manner as in the first embodiment.

[0065] (Hard coat film formation process S102) The hard coat film formation step S102 of this embodiment is a step of forming a hard coat film on at least one main surface (preferably both main surfaces) of the lens substrate formed in the lens substrate formation step S101, for example. In the hard coat film formation step S102 of this embodiment, a hard coat film containing resin is formed on at least one main surface of the lens substrate including the raised portion 20.

[0066] In the hard coat film formation step S102 of this embodiment, it is preferable to form a hard coat film containing a UV-curable resin. If, for example, a hard coat film containing a thermosetting resin is formed on a lens substrate on which the raised portion 20 is formed, heating is required during the hard coat film curing process, which may cause the raised portion 20 to soften again and deform. In contrast, by forming a hard coat film containing a UV-curable resin, the hard coat film can be photocured, thus reducing the risk of the raised portion 20 softening again and deforming.

[0067] If, in the raised portion formation step S103, a raised portion 20 having a surface shape with a recess in the center, as shown in Figure 2A, is formed, then in the hard coat film formation step S102 of this embodiment, a hard coat film may be formed to fill the recess of the raised portion 20.

[0068] (Anti-reflection film formation step S104) The anti-reflective film formation step S104 in this embodiment can be carried out in the same manner as in the first embodiment, so its description will be omitted.

[0069] By the above process, an eyeglass lens 100 comprising a base portion 10 and a plurality of raised portions 20 can be manufactured, similar to the first embodiment. Therefore, the manufacturing method of the eyeglass lens 100 in this embodiment also makes it possible to manufacture an eyeglass lens 100 that can suppress the progression of myopia without using a mold having a recess.

[0070] <Other embodiments of the present invention> Although embodiments of the present invention have been specifically described above, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0071] For example, in the above embodiment, the case in which the design of the multiple raised portions 20 in the spectacle lens 100 is constant was described, but the design of the multiple raised portions 20 in the spectacle lens 100 may be varied. Specifically, for example, the diameter D of the raised portions 20 may be increased from the center to the periphery of the spectacle lens 100. [Examples]

[0072] Next, embodiments of the present invention will be described. These embodiments are examples of the present invention, and the present invention is not limited to these embodiments.

[0073] (1) Preparation of lens substrate First, a lens substrate with a hard coat film formed on both main surfaces was prepared. A plastic lens substrate with a refractive index of 1.60 was used as the lens substrate. The hard coat film was formed using a thermosetting coating agent.

[0074] (2) Formation of the raised portion 20 Next, the hard coat film of the lens substrate prepared in (1) was irradiated with a CO2 laser to form multiple raised areas 20, which were designated as Samples 1 to 12. The CO2 laser used had a focal length of 145 mm, an average power of 12 W, a peak wavelength of 10.6 μm, and a Gaussian distribution of radiant intensity. To form one raised area 20, the CO2 laser was irradiated at a fixed point for 50 to 200 milliseconds. The irradiation conditions (irradiation distance, power) for Samples 1 to 12 are shown in Table 1. In Table 1, the irradiation distance is shown based on the focal length of the CO2 laser (0 mm), and the power is shown based on the average power of the CO2 laser (100%).

[0075] (3) Measurement of the shape of the raised portion 20 The surface shape (diameter D, height h, and depth d of the recess) was measured for the raised portion 20 (samples 1-12) formed in (2) using a surface profile measuring instrument (Talisurf CCIMP-HSXL). The results are shown in Table 1. In the shape classification in Table 1, those with a recess in the center, as shown in Figure 2A, are classified as A, those without a recess in the center (for example, a bell shape with a Gaussian distribution as shown in Figure 2B, or a spherical shape as shown in Figure 2C) are classified as B, and those with a mixture of A and B are classified as A-B.

[0076] [Table 1]

[0077] As shown in Table 1, we 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, we confirmed that the degree of design freedom for the spectacle lens 100, which is a myopia progression suppression lens, can be improved by forming the raised portion 20 retrofitted by laser processing without using a mold with a recess. [Explanation of Symbols]

[0078] 10 Base section 20 Ridges 100 eyeglass lenses S101 Lens substrate formation process S102 Hard coat film formation process S103 Ridge formation process S104 Anti-reflection film formation process

Claims

1. A step of preparing a lens substrate on which a hard coat film containing resin is formed on at least one main surface, The process includes a step of irradiating the hard coat film with a laser to form a plurality of raised portions on at least one of the lens substrate or the hard coat film, A method for manufacturing eyeglass lenses, wherein the eyeglass lens is a myopia progression suppression lens, and the raised portion has the property that light beams passing through at least a part of the raised portion are incident on the retina as divergent light.

2. The method for manufacturing eyeglass lenses according to claim 1, wherein in the step of forming the raised portion, the hard coat film is locally expanded by laser irradiation to form the raised portion.

3. The method for manufacturing eyeglass lenses according to claim 1, wherein in the step of forming the raised portion, the lens substrate is locally expanded by laser irradiation to form the raised portion.

4. The process of preparing a lens substrate containing resin, The process includes a step of irradiating the lens substrate with a laser to form a plurality of raised portions on the lens substrate, A method for manufacturing eyeglass lenses, wherein the eyeglass lens is a myopia progression suppression lens, and the raised portion has the property that light beams passing through at least a part of the raised portion are incident on the retina as divergent light.

5. The method for manufacturing an eyeglass lens according to claim 4, further comprising the step of forming a hard coat film on at least one main surface of the lens substrate, which includes a raised portion of the lens substrate.

6. The method for manufacturing eyeglass lenses according to claim 5, wherein the hard coat film includes an ultraviolet-curing resin.

7. The method for manufacturing eyeglass lenses according to any one of claims 1 to 6, wherein the laser is a CO2 laser.

8. The method for manufacturing eyeglass lenses according to any one of claims 1 to 7, wherein the radiation intensity distribution of the laser is a Gaussian distribution.

9. The method for manufacturing eyeglass lenses according to any one of claims 1 to 8, wherein in the step of forming the raised portion, the irradiation distance of the laser is set to be greater than or less than the focal length of the laser.

Images