Method for manufacturing eyeglass lenses

Abstract

The present invention provides a method for manufacturing an eyeglass lens and related technologies, wherein the eyeglass lens comprises: a lens substrate having a plurality of substrate protrusions protruding from a substrate base on a surface of the lens substrate; and a coating, which is arranged in a manner covering the plurality of substrate protrusions and has a plurality of depressions and projections on the outermost surface. The method for manufacturing the eyeglass lens is characterized in that the lens substrate is immersed in a coating liquid and then lifted up, and the coating liquid on the lens substrate is dried while or after it flows due to its own weight to form a coating.

Description

Technical Field

[0001] The invention relates to a method for manufacturing spectacle lenses. Background Art

[0002] Patent document 1 describes a spectacle lens that suppresses the development of refractive abnormalities such as myopia. Specifically, a convex surface of the spectacle lens on the object side is formed with a spherical micro-convex portion (substrate protrusion in this specification) with a diameter of about 1 mm. In the spectacle lens, usually, a light beam incident from the surface on the object side is emitted from the surface on the eyeball side and focused on the wearer's retina. On the other hand, the light beam that has passed through the above-mentioned micro-convex portion is focused at a position closer to the object side (near front side) than the wearer's retina. As a result, the development of myopia is suppressed.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent Application Publication No. 2017 / 0131567 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the spectacle lens described in Patent Document 1, when a coating is provided on a surface having minute convex portions (a convex surface serving as an object-side surface), the coating covers the surface having the minute convex portions.

[0008] If there is no coating, the light beam converges at a position closer to the object side than the predetermined position A through the micro-convex portion. However, when a coating is formed on the lens substrate, the outermost surface shape of the coating (i.e., the eyeglass lens) around the substrate protrusion protruding from the micro-convex portion, i.e., the substrate base portion, deviates from the shape near the boundary between the substrate base portion and the substrate protrusion in the lens substrate (hereinafter, also referred to as "near the boundary"). It is estimated that this deviation causes the light beam incident near the boundary to become stray light.

[0009] The inventors have conducted in-depth research to solve the above problems. The inventors have focused on a method for forming a coating. As a method for forming a coating, the spin coating method that has existed in the past is firstly focused on. If the spin coating method is adopted, the thickness of the coating near the boundary between the substrate base and the substrate protrusion is uniform. It is speculated that the uniformity of the thickness helps to suppress stray light. However, in the conventional spin coating method, the generation of stray light cannot be suppressed.

[0010] In addition, in the conventional spin coating method, since the lens substrates are rotated while being coated with the coating liquid one by one, it cannot be said that the productivity is good.

[0011] An object of one embodiment of the present invention is to provide a technology that can suppress the generation of stray light and has good productivity even when a coating is provided in a manner that covers a substrate protrusion on a lens substrate as a contribution to the myopia suppression effect.

[0012] Means for solving problems

[0013] The present inventors have conducted in-depth research to solve the above-mentioned problems. The present inventors changed their perspective and focused on the dipping method (immersion method) as a method for forming a coating, which is difficult to control the thickness of the coating and tends to become uneven compared to the spin coating method. The result of the dipping method is that the generation of stray light can be unexpectedly suppressed. Specifically, under the premise of a spectacle lens that can suppress the progression of myopia, the following insight is obtained: by making the thickness of the coating uneven around each protruding portion of the substrate, the generation of stray light can be suppressed.

[0014] For example, in the case of a spectacle lens capable of suppressing the progression of myopia, even if there is a portion with a large thickness of the coating around each substrate protrusion, that is, a portion with a large deviation in shape from the boundary between the substrate base portion in the lens substrate and the substrate protrusion, there is minimal unevenness on the outermost surface of the spectacle lens, and as shown in Patent Document 1, the effect of suppressing the progression of myopia caused by the substrate protrusion is exerted.

[0015] In the spin coating method that the inventors first focused on, the portion with a large deviation is equally present around each substrate protrusion. On the other hand, in one embodiment of the present invention, there is a portion with a small thickness of the coating around each substrate protrusion, that is, a portion with a small deviation from the shape near the boundary between the substrate base portion and the substrate protrusion in the lens substrate. The presence of this portion with a small deviation is a major difference from the eyeglass lens obtained by the conventional spin coating method.

[0016] In one embodiment of the present invention, even if there is a portion of the coating shape with a large deviation near the boundary between the substrate base and the substrate protrusion, it is only a portion. Moreover, when the dipping method is used, the portion with a large deviation is equal to the deviation obtained by the conventional spin coating method. Moreover, according to one embodiment of the present invention, since there is a portion with a small deviation in another portion, the generation of stray light is suppressed compared to the eyeglass lens obtained by the conventional spin coating method.

[0017] When the dipping method is used, the thickness of the coating becomes uneven because when the coating liquid flows down due to its own weight, there are areas around the protruding portion of the substrate where it flows down quickly and areas where it easily stays. As a result, there is a difference in the degree of deviation of the shape around the protruding portion of the substrate from that near the boundary.

[0018] Furthermore, by adopting the dipping method, a plurality of lens substrates can be processed at one time, compared with the conventional spin coating method, so the productivity is good.

[0019] Furthermore, it can be seen that when the dipping method is used, the stray light rate is significantly reduced even if the thickness of the coating is made uniform by the dipping method as in the spin coating method, in contrast to the non-uniform thickness of the coating. This example is described near the end of [Specifications] and in the item [Examples].

[0020] The present invention has been derived based on this finding.

[0021] A first aspect of the present invention relates to a method for manufacturing an eyeglass lens, wherein the eyeglass lens comprises: a lens substrate having a plurality of substrate protrusions protruding from a substrate base on a surface of the lens substrate; and a coating provided so as to cover the plurality of substrate protrusions and having a plurality of depressions and projections on an outermost surface, wherein the lens substrate is immersed in a coating liquid and then lifted up, and the coating liquid on the lens substrate is dried while or after it flows due to its own weight, thereby forming the coating.

[0022] A second aspect of the present invention is the aspect as described in the first aspect, wherein the spectacle lens can suppress the progression of myopia.

[0023] Other aspects of the present invention that can be combined with the above aspects are as follows.

[0024] In the case of curing by volatilization, the lens substrate having a coating film of the curable composition formed thereon is placed in an inclined state in an environment of an ambient temperature of 50 to 150° C. for about 30 minutes to 3 hours while the curable composition has fluidity, thereby allowing the curing reaction of the curable compound in the coating film to proceed. In addition, a drying treatment may be performed together with the curing reaction.

[0025] The viscosity of the curable composition for forming a coating on the surface of the lens substrate having the substrate protrusion can be appropriately set, and is preferably in the range of 1 to 50 mPa·s, more preferably in the range of 1 to 40 mPa·s, and even more preferably in the range of 1 to 20 mPa·s.

[0026] The temperature of the curable composition when dipping the lens substrate may be 0 to 30°C.

[0027] The boiling point of the solvent constituting the curable composition for immersing the lens substrate may be 30° C. to 200° C., preferably 60° C. to 120° C. The type of solvent is not limited, and for example, methanol, toluene, etc. may be used.

[0028] The concentration of the curable composition when the lens substrate is immersed may be 1 to 50 wt %.

[0029] The immersion time when the lens substrate is immersed may be 1 to 300 seconds.

[0030] The pulling speed of the curable composition when dipping the lens substrate may be 10 to 400 mm / min.

[0031] As a drying method after pulling, heating drying is preferred. In addition, the drying temperature after pulling is preferably 20 to 130° C. In addition, the drying time after pulling is preferably 0 to 90 minutes.

[0032] The film thickness of the film formed through the above steps can be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, and more preferably 1.0 to 3.0 μm).

[0033] Effects of the Invention

[0034] According to one embodiment of the present invention, even when a coating is provided so as to cover a substrate protrusion on a lens substrate as one of the aids to the myopia suppressing effect, the generation of stray light is suppressed and productivity becomes good. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 (a) is a photograph showing the results of investigating, using an optical microscope, the flux of the coating liquid when a lens substrate provided with only one substrate protrusion having a diameter of 3 mm was immersed in the coating liquid and then lifted up. Figure 1 (b) is a photograph showing the results of investigating, using an optical microscope, the flux of the coating liquid when a lens substrate having two substrate protrusions arranged on the left and right was immersed in the coating liquid and then lifted up.

[0036] Figure 2 This is a flowchart showing the flow of a method for inspecting eyeglass lenses according to one embodiment of the present invention.

[0037] Figure 3 This is a diagram (part 1) for explaining a method of determining a position where light rays converge.

[0038] Figure 4 This is a diagram (part 2) for explaining a method of determining a position where light rays converge.

[0039] Figure 5 This is a diagram (part 3) for explaining a method of determining a position where light rays converge.

[0040] Figure 6 is a flow chart showing a method of determining where light rays converge.

[0041] Figure 7This is a graph showing the thickness of a coating provided around (at the base) of any one of the protruding portions of the substrate in the eyeglass lens of Example 1 (0 to 360 degrees), with the vertical axis being the thickness of the coating and the horizontal axis being the rotation angle from zero.

[0042] Figure 8 This is a schematic cross-sectional view showing an example of a coating protrusion (i.e., coating convex portion) and an imaginary partial spherical shape of an actual eyeglass lens. The solid line represents the coating protrusion of the actual eyeglass lens, the dotted line represents the imaginary partial spherical shape, the dashed line represents the coating base portion of the actual eyeglass lens, and the horizontal line shaded portion represents the difference in the lens thickness direction between the imaginary partial spherical shape and the shape of the actual coating protrusion.

[0043] Fig. 9 It is a graph showing a correlation between a value (defocus value) obtained by subtracting the surface refractive power of the substrate base portion from the surface refractive power of the substrate protruding portion (horizontal axis) and a defocus power (vertical axis) calculated from the inverse of the focusing position. DETAILED DESCRIPTION

[0044] Hereinafter, embodiments of the present invention will be described. The following description based on the drawings is for illustrative purposes only, and the present invention is not limited to the illustrative forms.

[0045] The spectacle lenses listed in this specification have a surface on the object side and a surface on the eyeball side. The "surface on the object side" refers to the surface on the object side when the wearer wears the glasses with the spectacle lenses, and the "surface on the eyeball side" is the opposite surface, that is, the surface on the eyeball side when the wearer wears the glasses with the spectacle lenses. This relationship also applies to the lens substrate that is the basis of the spectacle lenses. That is, the lens substrate also has a surface on the object side and a surface on the eyeball side.

[0046] In this specification, when wearing eyeglass lenses, the sky direction of the sky is called the top (zero o'clock direction when observed from the center of the eyeglass lenses, rotation angle 0 degrees), and the opposite direction is called the bottom (6 o'clock direction, rotation angle 180 degrees). The sky-sky direction is the direction perpendicular to the optical axis direction of the eyeglass lenses when the wearer observes from the front, also called the vertical direction.

[0047] In addition, the lens center refers to the optical center or geometric center of the eyeglass lens. In this specification, the case where the optical center and the geometric center are substantially consistent is exemplified.

[0048] <Method for manufacturing eyeglass lenses>

[0049] The method for producing a spectacle lens according to one embodiment of the present invention is as follows.

[0050] “A method for manufacturing an eyeglass lens, the eyeglass lens comprising: a lens substrate having a plurality of substrate protrusions protruding from a substrate base on a surface of the lens substrate; and a coating provided so as to cover the plurality of substrate protrusions and having a plurality of concavities and convexities on an outermost surface, wherein the lens substrate is immersed in a coating liquid and then lifted up, and the coating liquid on the lens substrate is dried while or after the coating liquid flows due to its own weight, thereby forming a coating.”

[0051] The lens substrate is not limited as long as it has a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion.

[0052] The base portion of the substrate is a portion having a shape that can realize the prescription diopter of the wearer.

[0053] The so-called substrate protrusion is a portion equivalent to the micro-convex portion of Patent Document 1. The eyeglass lens involved in one embodiment of the present invention can suppress the progression of myopia. Furthermore, the lens substrate itself can suppress the progression of myopia. Similar to the micro-convex portion of Patent Document 1, the multiple substrate protrusions involved in one embodiment of the present invention only need to be formed on at least one of the object-side surface and the eyeball-side surface of the lens substrate, and this condition is referred to as "protrusion from the substrate base on the surface of the lens substrate". In this specification, the case where multiple substrate protrusions are provided only on the object-side surface of the lens substrate is mainly exemplified.

[0054] It should be noted that, as the lens substrate, the case of a plastic lens substrate or a glass lens substrate itself is mainly exemplified in this specification. On the other hand, other substances such as a base film may be laminated on the lens substrate. In the case where the lens substrate on which other substances are laminated is a lens substrate, the lens substrate is in a state where there are unevenness caused by a plurality of substrate protrusions, and the plurality of substrate protrusions refers to substrate protrusions that can bring about the effect of inhibiting the progression of myopia even if other substances are laminated.

[0055] In one embodiment of the present invention, a coating is formed on a lens substrate. The coating may be formed at least on a plurality of protruding portions of the substrate, but is preferably formed on both surfaces of the lens substrate in view of the use of a dipping method.

[0056] The dipping method in this specification mainly illustrates the following case: the lens substrate is dipped in the coating liquid from the bottom end, and finally the top end is dipped, so that the entire lens substrate is dipped in the coating liquid, and when lifting, it is lifted in the opposite direction to the vertical direction. On the other hand, the lens substrate can also be dipped in the coating liquid in a state where it is tilted to a certain extent from the top to the bottom, and then pulled in this state. In any case, the coating liquid on the lens substrate acts on its own weight and flows downward along the lens substrate.

[0057] The coating liquid is not limited as long as it can form a coating by causing the lens substrate to flow by its own weight when the lens substrate is immersed in the coating liquid and then lifted up, or by drying the coating liquid on the lens substrate after the coating liquid flows.

[0058] When the volatility of the coating liquid is relatively high, the lens substrate is dipped in the coating liquid and then pulled up, and the drying is completed while the coating liquid is flowing due to its own weight. On the other hand, when the volatility of the coating liquid is relatively low, the drying is not completed while the coating liquid is flowing due to its own weight, and after pulling up, the coating liquid is dried again to form a coating.

[0059] Regardless of the volatility of the coating liquid, when the lens substrate is immersed in the coating liquid and then lifted, the coating liquid flows more or less due to its own weight, which means that the coating liquid flows downward along the lens substrate. Due to this flow, as described in [Means for Solving the Problem], the thickness of the coating is made non-uniform around each protruding portion of the substrate.

[0060] Figure 1 (a) is a photograph showing the results of investigating, using an optical microscope, the flux of the coating liquid when a lens substrate provided with only one substrate protrusion having a diameter of 3 mm was immersed in the coating liquid and then lifted up. Figure 1 (b) is a photograph showing the results of investigating, using an optical microscope, the flux of the coating liquid when the lens substrate having two substrate protrusions arranged on the left and right was immersed in the coating liquid and then lifted up.

[0061] like Figure 1 As shown in (a), the flux of the coating liquid is small in the upper part (near the rotation angle of 0 degrees) and the lower part (near the rotation angle of 180 degrees) around the protruding part of the substrate. When the coating liquid is dried in this state, the coating is relatively thin in the upper part and the lower part around the protruding part of the substrate.

[0062] On the other hand, Figure 1 As shown in (a), the flux of the coating liquid is relatively large in the area other than the upper and lower areas around the substrate protrusion. When the coating liquid is dried in this state, the coating is relatively thick in the area other than the upper and lower areas around the substrate protrusion. This tendency is particularly evident in the case where two substrate protrusions are provided. Figure 1 The same can be seen in (b).

[0063] like Figure 1 As shown in (a) of FIG. 1 , even when only one substrate protrusion is provided, the thickness of the coating film around the substrate protrusion becomes non-uniform. Figure 1As shown in (b), even when a plurality of substrate protrusions are provided, the thickness of the coating will of course become uneven as shown in the item [Example] described later. As a result, by adopting the method of one embodiment of the present invention, the thickness of the coating will become uneven regardless of the number of substrate protrusions.

[0064] Furthermore, even if the type (plastic, glass), shape (size and number of substrate protrusions) of the lens substrate, the properties (type, viscosity, concentration, volatility) of the coating liquid, and the conditions of the dipping method (temperature of the coating liquid, speed of pulling the lens substrate, and thickness of the coating film associated therewith) are changed, as long as the dipping method is applied to a lens substrate having substrate protrusions, the coating liquid will flow due to its own weight, and thus the thickness of the coating will become non-uniform. This has been determined by the inventors through careful research.

[0065] According to the above method for manufacturing an eyeglass lens of one embodiment of the present invention, even when a coating is provided so as to cover a substrate protrusion on a lens substrate as one of the aids for the myopia suppressing effect, the generation of stray light can be suppressed and productivity is improved.

[0066] Specific examples (preferred examples) of the conditions of the lens substrate, substrate protrusion, coating, coating liquid, and immersion method, as well as a method for measuring the stray light rate are described below.

[0067] [Lens substrate]

[0068] The size of the substrate protrusion and the arrangement of the multiple substrate protrusions on the surface of the lens substrate are not particularly limited, and can be determined, for example, from the perspective of the visual recognizability of the substrate protrusion from the outside, the design based on the substrate protrusion, and the refractive power adjustment based on the substrate protrusion. The height of the substrate protrusion can be, for example, 0.1 to 10 μm, preferably 0.7 to 0.9 μm (equivalent to 3.5 to 4.5 D). When viewed from above (i.e., when the substrate protrusion is viewed from the optical axis direction facing the substrate protrusion), the radius of curvature of the surface of the substrate protrusion can be, for example, 50 to 250 mmR. In addition, the distance between adjacent substrate protrusions (the distance between the end of a substrate protrusion and the end of a substrate protrusion adjacent to the substrate protrusion) can be, for example, set to the same value as the radius of the substrate protrusion. In addition, multiple substrate protrusions can be arranged approximately evenly near the center of the lens, for example.

[0069] 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. The glass lens substrate can also be, for example, a lens substrate made of inorganic glass. As the lens substrate, from the viewpoint of being lightweight and not easy to break, a plastic lens substrate is preferred. As the plastic lens substrate, styrene resins headed by (meth) acrylic resins, polycarbonate resins, allyl resins, allyl carbonate resins such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resins, polyester resins, polyether resins, polyurethane resins obtained by the reaction of isocyanate compounds with hydroxyl compounds such as diethylene glycol, thiocarbamate resins formed by reacting isocyanate compounds with polythiol compounds, and curable compositions containing (sulfur) epoxy compounds having more than one disulfide bond in the molecule are cured (commonly referred to as transparent resins). The curable composition can also be referred to as a polymerizable composition. As the lens substrate, an undyed lens substrate (colorless lens) can be used, and a dyed lens substrate (dyed lens) can also be used. The thickness and diameter of the lens substrate are not particularly limited. For example, the thickness (center wall thickness) can be about 1 to 30 mm, and the diameter can be about 50 to 100 mm. The refractive index of the lens substrate can be set to about 1.60 to 1.75, for example. However, the refractive index of the lens substrate is not limited to this range, and it can also deviate from this range up or down. In the present invention and this specification, the refractive index refers to the refractive index for light with a wavelength of 500 nm. The lens substrate can be molded by a known molding method such as cast polymerization. For example, by using a molding mold having a molding surface with multiple recesses, a lens substrate based on cast polymerization is molded, and a lens substrate having a substrate protrusion on at least one surface can be obtained.

[0070] [Lamination]

[0071] As one form of the coating formed on the surface of the lens substrate having the substrate protrusion, a cured film formed by curing a curable composition containing a curable compound (the coating liquid described above) can be cited. This cured film is generally called a hard coating film, which helps to improve the durability of the eyeglass lens. A curable compound refers to a compound having a curable functional group, and a curable composition refers to a composition containing one or more curable compounds.

[0072] As one form of the curable composition (film coating liquid) for forming a cured film, a curable composition containing an organosilicon compound as a curable compound can be cited, and a curable composition containing metal oxide particles together with the organosilicon compound can also be cited. As an example of a curable composition that can form a cured film, a curable composition described in Japanese Patent Publication No. 63-10640 can be cited.

[0073] In addition, as one embodiment of the organosilicon compound, an organosilicon compound represented by the following general formula (I) and a hydrolyzate thereof can also be mentioned.

[0074] (R 1 ) a (R 3 ) b Si(OR 2 ) 4－(a+b) ···(I)

[0075] In the general formula (I), R 1 represents an organic group having a glycidyloxy group, an epoxy group, a vinyl group, a methacryloxy group, an acryloxy group, a mercapto group, an amino group, a phenyl group, etc., and 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, and 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 represent 0 or 1 respectively.

[0076] R 2 The alkyl group having 1 to 4 carbon atoms is a linear or branched alkyl group, and specific examples thereof include a methyl group, an ethyl group, a propyl group, and a butyl group.

[0077] As R 2 Examples of the acyl group having 1 to 4 carbon atoms include acetyl, propionyl, oleoyl, and benzoyl.

[0078] As R 2 Examples of the aryl group having 6 to 10 carbon atoms include phenyl, xylyl, tolyl, and the like.

[0079] R 3 The alkyl group having 1 to 6 carbon atoms is a linear or branched alkyl group, and specific examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group.

[0080] As R 3 Examples of the aryl group having 6 to 10 carbon atoms include phenyl, xylyl, tolyl, and the like.

[0081] Specific examples of the compound represented by the general formula (I) include compounds described in paragraph 0073 of JP-A-2007-077327. Since the organosilicon compound represented by the general formula (I) has a curable group, it can form a hard coating film as a cured film by curing after coating.

[0082] Metal oxide particles can contribute to the adjustment of the refractive index and the improvement of the hardness of the cured film. As specific examples of metal oxide particles, particles such as 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) can be cited. Two or more metal oxide particles can be used alone or in combination. From the viewpoint of both the scratch resistance and optical properties of the cured film, the particle size of the metal oxide particles is preferably in the range of 5 to 30 nm. The content of the metal oxide particles of the curable composition can be appropriately set in consideration of the refractive index and hardness of the cured film formed, and can usually be about 5 to 80% by mass relative to the solid content of the curable composition. In addition, from the viewpoint of dispersibility in the cured film, the metal oxide particles are preferably colloidal particles.

[0083] [Immersion method]

[0084] The supply of the coating liquid for forming a cured film (coating) on ​​the surface of the lens substrate having the substrate protrusion is performed by immersing the lens substrate in the coating liquid (curable composition). Thus, liquid is intentionally accumulated around the substrate protrusion, and the film thickness of the coating (the above-mentioned cured film) is made uneven around the substrate protrusion.

[0085] The cured film can be formed by the following method. For example, a curable composition prepared by mixing components and optional components such as an organic solvent, a surfactant (leveling agent), and a curing agent as required is applied to the surface of the lens substrate having a substrate protrusion by dip coating, or a coating film is formed by dip coating via other films. The coating film is subjected to a curing treatment (e.g., heating and / or light irradiation) corresponding to the type of curable compound. For example, in the case of a curing treatment by volatilization, the lens substrate on which the coating film of the curable composition is formed is tilted in a state where the curable composition has fluidity, and is arranged in an environment of an atmospheric temperature of 50 to 150° C. for about 30 minutes to 3 hours, thereby allowing the curing reaction of the curable compound in the coating film to proceed. In addition, a drying treatment can also be performed together with the curing reaction.

[0086] The viscosity of the curable composition for forming a coating on the surface of the lens substrate having the substrate protrusion can be appropriately set, preferably in the range of 1 to 50 mPa·s, more preferably in the range of 1 to 40 mPa·s, and further preferably in the range of 1 to 20 mPa·s. The viscosity in the present invention and this specification refers to the viscosity at a liquid temperature of 25°C.

[0087] The temperature of the curable composition when dipping the lens substrate may be 0 to 30°C.

[0088] The boiling point of the solvent constituting the curable composition for immersing the lens substrate may be 30° C. to 200° C., preferably 60° C. to 120° C. The type of solvent is not limited, and for example, methanol, toluene, etc. may be used.

[0089] The concentration of the curable composition when the lens substrate is immersed may be 1 to 50 wt %.

[0090] The immersion time when the lens substrate is immersed may be 1 to 300 seconds.

[0091] The pulling speed of the curable composition when dipping the lens substrate may be 10 to 400 mm / min.

[0092] In addition, as a method of forming a coating on the surface of the lens substrate having a substrate protrusion, a coating called a primer film that helps to improve the adhesion between layers can also be generally cited. As a coating liquid capable of forming such a coating, a composition in which a resin component such as a polyurethane resin is dispersed in a solvent (water, an organic solvent or a mixed solvent thereof) can be cited (hereinafter, described as a "drying curable composition"). The composition is cured by removing the solvent by drying. Drying can be performed by drying treatments such as air drying and heat drying. In addition, a curing reaction can also be performed together with the drying treatment.

[0093] As a drying method after pulling, heating drying is preferred. In addition, the drying temperature after pulling is preferably 20 to 130°C. In addition, the drying time after pulling is preferably 0 to 90 minutes. The drying time of 0 minutes refers to the drying of the flowing coating liquid, which means that even if the drying step is not specifically performed, the coating liquid will solidify due to the volatilization of the solvent to form a coating.

[0094] The film thickness formed through the above steps may be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, more preferably 1.0 to 3.0 μm). However, the film thickness is determined according to the function required of the film and is not limited to the exemplified range.

[0095] It is also possible to further form more than one coating on the coating. As an example of such a coating, various coatings such as an anti-reflection film, a waterproof or hydrophilic antifouling film, and an antifogging film can be cited. Regarding the formation method of these coatings, known techniques can be applied.

[0096] [Method for measuring stray light rate]

[0097] Stray light is light that enters from the surface on the object side of the spectacle lens and exits from the surface on the eyeball side, and refers to light that does not pass through the vicinity of the predetermined position A where the light is converged by the spectacle lens itself, nor does it pass through the protrusion of the substrate or even the protrusion of the coating, where the light is converged near the position B. Stray light causes blurring of the wearer's field of vision. Therefore, it is preferable to reduce the proportion of stray light in the light that enters from the surface on the object side of the spectacle lens and exits from the surface on the eyeball side (hereinafter also referred to as stray light rate).

[0098] One of the reasons for the generation of stray light is the coating. If the shape of the convex surface, which is the surface on the object side of the base, changes too gradually at the base of the coating convex portion, it will become a shape that is separated from the spherical shape of the substrate protrusion and the convex surface on the object side. In this case, it will not be focused even on the wearer's retina (near the specified position A in this manual) and will not be focused near the position B close to the object side mentioned above.

[0099] The "root of the coated convex portion (also referred to as the periphery)" in this specification refers to the boundary between the outermost base portion of the eyeglass lens and the coated convex portion and the base portion near it, and the portion where the astigmatism begins to increase sharply. The astigmatism (cross-sectional curve) in the cross-section of the eyeglass lens can be measured by a method such as coherent correlation interferometry. In addition, the root of the coated convex portion can also be an annular area that is 0.2 times the distance between the center and the boundary in the direction away from the top view center of the coated convex portion.

[0100] Ray tracing calculation is used to set the stray light rate. In this calculation, it is assumed that multiple light rays are evenly incident on the specified range of the object side surface of the spectacle lens and pass through the coating (the condition of wearing the so-called spectacle lens to see the outside world). The "specified range" only needs to be the optical area of ​​the object side surface. The optical area refers to the part of the object side surface and the eyeball side surface opposite thereto that has a curved surface shape that realizes the diopter set for each wearer.

[0101] Here, the conditions for determining the stray light rate are described below.

[0102] Figure 2 This is a flowchart showing the flow of a method for inspecting eyeglass lenses according to one embodiment of the present invention.

[0103] like Figure 2 As shown in FIG. 1 , first, in step 101, the shape of the object-side surface (hereinafter, also referred to as the convex surface) of the actual eyeglass lens is measured, and curved surface data representing the shape of the convex surface is prepared (shape measurement step). The shape of the convex surface is measured, for example, by a non-contact three-dimensional microscope that measures the length using interference of light. The three-dimensional shape of the convex surface is obtained, for example, as discrete three-dimensional data (x, y, z).

[0104] Next, in step 102, curved surface data is generated based on the data representing the convex shape of the obtained spectacle lens (curved surface data generation step). In addition, when discrete three-dimensional data is used as the data representing the convex shape of the spectacle lens, for example, a set of B-spline curves may be generated. In addition, when there is noise in the measured discrete three-dimensional data, for example, a moving average process may be performed to use an average value.

[0105] Next, in step 103, a model of an actual eyeglass lens is set based on the above-mentioned curved surface data (model setting step).

[0106] The actual spectacle lens model is set, and the eyeball model is also set. The eyeball model can be made using information related to the wearer (such as the axial length of the eye, the amount of eye accommodation, etc.). At this time, the inclination of the spectacle lens when mounted on the frame (the forward tilt angle and the frame tilt angle) can also be considered, and the spectacle lens model can be configured relative to the eyeball model.

[0107] Next, in step 104, the position where the light rays converge most when passing through the actual eyeglass lens is determined by ray tracing processing (convergence position determination step). Specifically, a PSF (Point spread function) representing the brightness distribution caused by the light rays after the light rays emitted from a point light source at an infinite distance pass through the model based on the surface data of the actual eyeglass lens is obtained.

[0108] The PSF is obtained by tracking multiple light rays emitted from a point light source and calculating the density of the light spot on an arbitrary surface. Then, the PSFs of multiple arbitrary surfaces are compared to determine the position (surface) where the light rays in the multiple arbitrary surfaces converge the most. It should be noted that the diameter of the beam of multiple light rays can be set based on the direction diameter, for example, it can also be set to

[0109] Here, the method of determining the position where the light rays are most converged in step 104 is described in more detail. Figure 3 to Figure 5 is a diagram for explaining a method of determining a position where light rays converge. Figure 6 is a flow chart showing a method for determining the position where light rays converge. Figure 3 , reference numeral 30 is the surface on the eyeball side, reference numeral 33 is the surface on the object side, reference numeral 36 refers to the protrusion of the substrate (and thus the outermost coating protrusion of the eyeglass lens), reference numeral 32 is the eyeball model, and reference numeral 32A refers to the retina.

[0110] First, if Figure 3As shown in FIG. 2 , in step 201, it is assumed that the light passes through the convex part of the coating on the model on the object side surface (convex surface) on the model. On this basis, the measurement surfaces P1,1 to P1,n are set at a predetermined distance (for example, the thickness of the vitreous body of the eyeball, that is, a position of about 16 mm) from the 0 mm position on the retina A of the eyeball model to the retina at a predetermined separation interval Δd (for example, 0.1 mm). In addition, the separation interval Δd can be 0.2 mm interval or 1 / 50 of the axial length of the eye.

[0111] Next, in step 202, ray tracing is performed to calculate the density of light rays in each measurement surface P1,1 to P1,n. The density of light rays can be calculated by, for example, presetting a grid (e.g., 0.1 mm×0.1 mm) on each measurement surface and calculating the number of light rays passing through each grid.

[0112] Next, in step 203, in order to determine the measurement surface where the light incident on the convex portion has the maximum density, the measurement surface P1,i of the initial maximum density is determined in the measurement surfaces P1,1 to P1,n according to the specified distance. In order to save calculations, the calculation of the light density may be started from the measurement surface P1, and after the initial maximum value is detected, the calculation of the light density decreases to a value approximately halfway between the value at the measurement surface P1 and the initial maximum value, and the calculation of this step is terminated.

[0113] Then, if Figure 4 As shown in FIG. 2 , in step 204, the measurement plane P2,1 and the measurement plane P2,2 are set at the positions separated by a distance Δd / 2 before and after the measurement plane P1,i of the maximum density. Then, in step 205, the density of light rays at the measurement plane P2,1 and the measurement plane P2,2 is calculated. Next, in step 206, the measurement planes of the maximum density at the measurement planes P2,1, P2,2, and P1,i are determined.

[0114] Then, in step 207, the same steps as steps 204 to 206 are repeated until the separation distance becomes sufficiently small. Figure 5 As shown in , the following steps are repeated: on the measurement surface that has just reached the maximum density (at Figure 5 P2,2), the new separation distance is half of the previous separation distance (in Figure 5 Set a new measurement surface at the position of Δd / 4 (in Figure 5 The process includes: calculating the density of light on a new measurement surface; and determining the measurement surface with the largest density between the measurement surface that is about to have the maximum density and the new measurement surface.

[0115] Through the above steps, the position where the light in the optical axis direction (lens thickness direction, Z axis) is focused can be determined.

[0116] Next, the convergence position of the light on the plane perpendicular to the optical axis (i.e., the determined measurement plane) is determined. This is done using the PSF as described above. Through the PSF, the location where the light (points on the measurement plane) is most dense is taken as the convergence position B of the light on the measurement plane.

[0117] Then, the number of rays outside the range of, for example, 0.1 mm radius is calculated based on the convergence position B of the rays on the measurement surface. In this specification, the range of, for example, 0.1 mm radius from the convergence position B is referred to as "near position B".

[0118] From the light outside the above range, the light within the radius of 0.1mm from the predetermined position A where the light of the eyeglass lens itself converges (i.e., the normal light that converges at position A) is subtracted. In this specification, the range of, for example, a radius of 0.1mm from the convergence position A is referred to as the "near position A".

[0119] The subtracted number of light rays do not converge near position A where the light rays converge in the eyeglass lens itself, nor do they converge near position B on the object side where the light rays converge in the coating convex portion. In this specification, such light rays are referred to as stray light.

[0120] <Spectacle lenses>

[0121] The eyeglass lens obtained by the method of one embodiment of the present invention is as follows.

[0122] “An eyeglass lens, comprising: a lens substrate having a plurality of substrate protrusions protruding from a substrate base portion on a surface of the lens substrate; and a coating provided so as to cover the plurality of substrate protrusions, having a plurality of depressions and projections on an outermost surface, and having a non-uniform thickness of the coating around each substrate protrusion.”

[0123] As described in the column of the effects of the present invention, the spectacle lens obtained by the method of one embodiment of the present invention suppresses the generation of stray light compared to the case where a coating is formed on the micro convex portions by the conventional spin coating method as described in Patent Document 1.

[0124] The stray light rate of the eyeglass lens according to one embodiment of the present invention is 30% or less. Thus, even after the coating is formed on the lens substrate, the myopia suppressing effect can be fully exhibited.

[0125] One of the reasons for generating stray light is the coating. In the spectacle lens of one embodiment of the present invention, if the coating is necessary, the stray light rate may be set to more than 0% (or more than 0%, further more than 2%) and less than 20%. In addition, since it is preferable to reduce the stray light rate, it is preferably set to less than 20%, more preferably set to less than 15% (more preferably less than 15%), and more preferably set to less than 10% (preferably less than 10%).

[0126] In addition, it is preferred that when each substrate protrusion is viewed from above, the coating is thin in an area in a specified direction and in an area in the opposite direction around each substrate protrusion, that is, all substrate protrusions, and there is a thick coating portion in areas in directions other than those areas.

[0127] In this specification, as described above, in order to perform immersion and pulling in the vertical direction, the example of flowing the coating liquid from the upper side to the lower side of the lens substrate is mainly cited. Therefore, in this example, the area in the predetermined direction where the coating is thin in the upper section refers to the upper side (zero o'clock direction when viewed from the predetermined direction = the geometric center of the substrate protrusion, rotation angle 0 degrees) and the lower side (six o'clock direction when viewed from the opposite direction of the predetermined direction = the geometric center of the substrate protrusion, rotation angle 180 degrees) of each substrate protrusion.

[0128] Furthermore, the "directions other than these" in the above paragraph refer to directions other than the upper and lower directions in the above examples (i.e., the rotation angle is greater than 0 degrees and less than 180 degrees, and greater than 180 degrees and less than 360 degrees when observed from the geometric center of the substrate protrusion). More specifically, the area around each substrate protrusion and the area where the coating is thicker is an area of ​​15 to 145 degrees and 215 to 345 degrees (preferably 50 to 110 degrees and 250 to 310 degrees with 80 degrees and 280 degrees as the center) rotated clockwise from the specified direction when observed from the geometric center of the substrate protrusion.

[0129] The larger the ratio of the maximum value to the minimum value of the thickness of the coating around the protruding portion of the substrate, the more preferable it is. The formation of unevenness in the finished spectacle lens (especially to exert the effect of inhibiting the progression of myopia) means that even if the thickness of the coating around the protruding portion of the substrate is large, it is not a thickness that completely eliminates the shape of the protruding portion of the substrate.

[0130] That is, the maximum value of the thickness of the coating around the protruding portion of the substrate is a common sense value (a value when the coating is provided on the protruding portion of the substrate by the conventional spin coating method) based on the fact that the spectacle lens has the effect of suppressing the progression of myopia.

[0131] In this case, if the minimum thickness of the coating around the substrate protrusion can be set to a small value, the shape of the outermost surface of the eyeglass lens approximates the shape of the substrate protrusion, which means that the stray light rate of the portion with the smallest coating thickness is reduced.

[0132] Therefore, compared with the case of using the conventional spin coating method, the stray light rate related to the outermost surface portion of the eyeglass lens corresponding to one substrate protrusion is reduced. In view of the above, the value obtained by dividing the maximum value of the thickness of the coating around the substrate protrusion by the minimum value (minimum value / maximum value) is preferably 1 / 1.5 (preferably 1 / 2) to 1 / 10. In this specification, the state where (the minimum value / the maximum value) is less than 1 / 1.5 (preferably 1 / 2) is referred to as "non-uniform thickness".

[0133] One embodiment of the present invention described so far achieves non-uniform thickness of the coating by dipping. On the other hand, even if the thickness of the coating is uniformed by dipping as in the spin coating method, the stray light rate is significantly reduced (Examples 4 and 5). As a specific numerical value, the stray light rate can be made less than 5%. As a specific method, a solvent with a low boiling point is used in the coating liquid, or the solvent ratio in the coating liquid is increased.

[0134] For example, the viscosity of the curable composition for forming a coating on the surface of the lens substrate having the substrate protrusion is set to a range of 1 to 5 mPa·s. Also, as an example, the concentration of the curable composition when the lens substrate is immersed is set to 1 to 20 wt%.

[0135] In this method, the shape of the protruding portion of the coating can be very similar to the shape of the protruding portion of the substrate directly below it. Therefore, the stray light rate is significantly reduced. On the other hand, in order to increase the solvent ratio of the coating liquid and reduce the ratio of the coating raw material, it is difficult to increase the film thickness, and it is appropriate to set it to less than 2.0μm. If so, in terms of durability, one of the methods of the present invention described above has a share.

[0136] In summary, the technical concept of the present invention is to form a coating on the base portion and the protruding portion of the substrate using the dipping method. The dipping method to be used can be determined based on whether the stray light rate or the durability is important.

[0137] It should be noted that "convergence" in this specification means convergence in at least one direction of the longitudinal direction and the lateral direction. In addition, the convergence position may not be one, and the convergence position may vary in the optical axis direction depending on the position within one coating protrusion.

[0138] Example

[0139] Next, the present invention will be specifically described with reference to examples. Of course, the present invention is not limited to the following examples.

[0140] <Example 1>

[0141] The following lens substrate was produced. In addition, no lamination of other materials was performed on the lens substrate. The prescription power was set to S (spherical power) of 0.00D and C (astigmatism power) of 0.00D.

[0142] Diameter of lens substrate when viewed from above: 100 mm

[0143] Type of lens substrate: PC (polycarbonate)

[0144] Refractive index of lens substrate: 1.589

[0145] Base curve of lens substrate: 3.00D

[0146] Surface where the protrusion of the substrate is formed: Surface on the object side

[0147] Shape of the protruding portion of the substrate when viewed from above: perfect circle (diameter 1 mm)

[0148] Height of substrate protrusion from substrate base: 0.8 μm

[0149] Arrangement of substrate protrusions in a plan view: They are independently and discretely arranged so that the center of each substrate protrusion becomes a vertex of an equilateral triangle (the center of each substrate protrusion is arranged at a vertex of the honeycomb structure)

[0150] The area where the protrusion of the substrate is formed: within a circle with a radius of 17 mm from the center of the lens

[0151] The distance between the protrusions of the substrate (the distance between the centers of the protrusions of the substrate): 1.5 mm

[0152] The coating was formed on both sides (the entire upper and lower sides) of the lens substrate by dipping. The dipping direction and the pulling direction were perpendicular to each other. The coating liquid and the dipping method conditions were as follows.

[0153] Type of coating liquid: Thermosetting coating agent

[0154] Temperature of coating liquid: 10℃

[0155] Viscosity of coating liquid: 10mPa·s

[0156] Boiling point of the solvent (methanol) of the coating liquid: 64.7°C

[0157] Dipping time: 3 minutes

[0158] Pulling speed: 60mm / min

[0159] Drying method after pulling: heating

[0160] Drying temperature after pulling: 110℃

[0161] Drying time after lifting: 90 minutes

[0162] <Comparative Example 1>

[0163] Spin coating was performed on both surfaces of the lens substrate prepared in Example 1. The other procedures were the same as in Example 1. The conditions of the spin coating were as follows.

[0164] Speed: 1300rpm

[0165] Drying method after spin coating: heating

[0166] Drying temperature after spin coating: 110°C

[0167] Drying time after spin coating: 90 minutes

[0168] <Confirmation of the Unevenness of the Film Thickness>

[0169] The degree of non-uniformity in the thickness of the coating was confirmed for Example 1. Specifically, the thickness of the coating was obtained using an apparatus such as Talisser CCI MP HS (manufactured by Ametek Co., Ltd.).

[0170] Figure 7 It is a graph showing the thickness of the coating provided around (base) any one of the protruding portions of the substrate in the eyeglass lens of Example 1 (0 to 360 degrees), with the vertical axis being the thickness of the coating and the horizontal axis being the rotation angle from zero.

[0171] Figure 7 Assuming that the protrusion on the outermost surface of the eyeglass lens after the coating is formed (coating protrusion) is the best approximation of the partial shape of the sphere (hypothetical partial spherical shape), the height difference in the Z-axis direction from the hypothetical partial spherical shape is taken as the value of the vertical axis. Since it is not the difference from the actual substrate protrusion, Figure 7 The smaller thickness portion is negative.

[0172] Figure 8 This is a schematic cross-sectional view showing an example of a coating protrusion and an imaginary partial spherical shape of an actual spectacle lens. The solid line represents the coating protrusion of the actual spectacle lens, the dotted line represents the imaginary partial spherical shape, the dashed line represents the base portion of the actual spectacle lens, and the horizontal line hatching represents the difference in the lens thickness direction between the imaginary partial spherical shape and the shape of the actual coating protrusion.

[0173] like Figure 8 As shown, in Figure 7The negative value of the vertical axis of the coordinate graph indicates that the height is lower than the imaginary partial spherical shape. In addition, the larger the negative value of the vertical axis, the thinner the thickness of the coating is at the peripheral portion corresponding to the negative value of the vertical axis.

[0174] The hypothetical partial spherical surface shape is a partial shape of a spherical surface that best approximates the shape of the coating protrusion of an actual eyeglass lens. The hypothetical partial spherical surface shape is obtained by, for example, the least square method.

[0175] One specific example of the best approximation is as follows. A spherical shape is overlapped with the shape of the coating protrusion. From the shape of the base portion of the outermost surface of the eyeglass lens, which rises toward the vertex until the end of the rise, the difference between the two shapes in the lens thickness direction (optical axis direction, Z axis) is squared. A hypothetical partial spherical shape is set that minimizes the sum of these values.

[0176] As a method other than the least squares method, a hypothetical partial spherical shape may be obtained from the positions of the apex of the coating protrusion and a plurality of points near it. In this case, the apex of the hypothetical partial spherical shape may be made consistent with the apex of the coating protrusion of the actual eyeglass lens to examine the difference.

[0177] As the rising start portion from the shape of the base portion on the outermost surface, the point where the product of the shape of the coating protrusion portion is converted into an increase in the curve obtained by first differentiation may be used as the rising start portion. Alternatively, the rising portion of the peak of the astigmatism cross-sectional curve in the cross section passing through the center of the coating protrusion portion when viewed from above may be used as the rising start portion. The rising end portion may be set in the same manner.

[0178] In Comparative Example 1 using the spin coating method, the thickness of the coating around the protruding portion of the substrate is uniform. On the other hand, in Example 1 using the dipping method, the thickness of the coating around the protruding portion of the substrate is non-uniform.

[0179] <Determination of Defocusing Power and Stray Light Rate>

[0180] Defocus power was measured for Example 1 and Comparative Example 1. Defocus power (unit: D) ​​is a value indicating how far away from the retina a light beam is from being focused, and can be measured using ray tracing and part of the above-mentioned stray light rate measurement method.

[0181] In addition, the stray light rate was measured by the above method for Example 1 and Comparative Example 1. The stray light rate is represented by 100×(number of stray light rays) / (number of incident light rays).

[0182] It should be noted that the results of the defocusing power and the stray light rate were obtained as follows. In the range where the substrate protrusion is formed (within a circle with a radius of 17 mm from the center of the lens), it is assumed that the coating protrusion includes any circular area every 7 circles, and the value in the circular area is used as the measurement result. By the above method, the eyeglass model and the eyeball model are set, and the focusing position is determined by making multiple light rays incident on the above circular area by the ray tracing method.

[0183] The eyeball model and other various conditions are as follows.

[0184] Axial length: 24mm

[0185] Eye adjustment: 0.0D

[0186] Cornea-lens vertex distance (CVD): 12.0 mm

[0187] Distance from corneal vertex to eyeball's rotation center: 13.0mm

[0188] Hereinafter, unless otherwise specified, the above conditions shall apply. However, the present invention is not limited to the above conditions.

[0189] Here, first, a glasses model using a plurality of design shapes is set, and the focusing position is examined by the method described in the [Specific Implementation Method]. The convex surface of the designed glasses model (lens substrate) here has the substrate base as a spherical surface, and the substrate protrusion is formed by a spherical surface with a curvature radius smaller than the curvature radius of the substrate base. Relative to the spherical surface of the substrate base with a certain curvature, the curvature radius of the substrate protrusion is discretely changed to set a plurality of design shapes. Then, the value obtained by subtracting the surface refractive power [D] based on the curvature radius of the substrate base from the surface refractive power [D] based on the curvature radius of the substrate protrusion is taken as the defocus value. The correlation equation between the defocus value and the defocus power calculated according to the inverse of the actual above-mentioned focusing position is obtained by using a ray tracing method using a glasses model using a plurality of design shapes.

[0190] Fig. 9 It is a coordinate graph showing a correlation equation between a value (defocus value) obtained by subtracting the surface refractive power of the substrate base portion from the surface refractive power of the substrate protruding portion (horizontal axis) and a defocus power (vertical axis) calculated from the inverse of the focusing position.

[0191] The defocus power in Example 1 was measured by obtaining a value corresponding to the defocus power in the eyeglass lens produced in Example 1 using this correlation formula.

[0192] The stray light rate is also calculated based on the PSF of the light-converging position grasped by the method described in one embodiment of the present invention.

[0193] In Example 1 and Comparative Example 1, it is assumed that there are 7 areas where light is densely distributed on the plane perpendicular to the optical axis direction at the focusing position (optical axis direction) obtained during the above-mentioned defocusing force measurement. This is to assume that the coating convex portion includes an arbitrary circular area of ​​every 7 circles. It is assumed that a grid-like grid is pre-set on each measurement surface, and the number of light passing through each grid is calculated. When the grid becomes more than a certain number, it is assumed that the light is densely distributed in the 7 parts.

[0194] In Example 1 and Comparative Example 1, the centroid positions of the respective regions are obtained as a plurality of convergence positions B, and the number of stray light rays is obtained by subtracting the light rays near position A from the light rays outside the range near these positions B. Based on the number of stray light rays, the stray light rate is calculated by the method described in [Specific embodiments].

[0195] The defocusing power of Example 1 is 3.73D and the stray light rate is 7.7%, while the defocusing power of Comparative Example 1 is 3.51D and the stray light rate is 11.25%. The spectacle lens of Example 1 has a lower stray light rate than the spectacle lens of Comparative Example 1, and can ensure sufficient defocusing power.

[0196] <Example 2>

[0197] An antireflection film was formed on the lens substrate with a coating produced in Example 1. Details of the production conditions of the antireflection film are as described in Example 3 of Japanese Patent Application Laid-Open No. 2013-97159.

[0198] The defocus power of Example 2 is 3.73D, and the stray light rate is 7.7%. The spectacle lens of Example 2 has the same performance in defocus power and stray light rate as the spectacle lens of Example 1. That is, it can be confirmed that the effect of the present invention is not impaired by the formation of the anti-reflection film.

[0199] <Example 3>

[0200] A second coating liquid was prepared in which the amount of metal sol was reduced and methanol was added to the coating liquid used in Example 1. The lens substrate prepared in Example 1 was immersed in the second coating liquid. The same procedures as in Example 1 were repeated except for the above.

[0201] The defocusing power of Example 3 is 3.70D, and the stray light rate is 8.1%.

[0202] In Example 3, the defocusing force can be improved and the stray light rate can be reduced compared to the case where a coating is formed on the micro-convex portion by the conventional spin coating method described in Patent Document 1. It is presumed that this is because even if the properties of the coating liquid are changed, the thickness of the coating is changed, and the thickness of the coating around the protruding portion of the substrate is non-uniform based on the presence of the concavo-convex on the outermost surface of the eyeglass lens.

[0203] <Example 4>

[0204] The coating was formed by dipping on both sides (the entire upper and lower sides) of the same lens substrate as in Example 1. The same method as in Example 1 was used except that the solvent of the coating liquid was ethanol and the average thickness of the coating just above the base of the substrate was about 1.0 μm. The conditions of the coating liquid and the dipping method are as follows.

[0205] Type of coating liquid: Thermosetting coating agent

[0206] Temperature of coating liquid: 15℃

[0207] Viscosity of coating liquid: 3mPa·s

[0208] Boiling point of the solvent (ethanol) in the coating liquid: 78.4°C

[0209] Dipping time: 3 minutes

[0210] Pulling speed: 7mm / sec

[0211] Drying method after pulling: heating

[0212] Drying temperature after pulling: 110℃

[0213] Drying time after lifting: 90 minutes

[0214] <Example 5>

[0215] The coating was formed by the same method as in Example 4 by adjusting the pulling speed and the like so that the average thickness of the coating just above the base portion of the substrate became about 0.1 μm.

[0216] The defocusing power of Example 4 is 4.09D, and the stray light rate is 2.7%.

[0217] The defocusing power of Example 5 is 4.09D, and the stray light rate is 2.8%.

[0218] In Examples 4 and 5, the defocusing power can be improved and the stray light rate can be reduced compared to the case where the coating is formed on the micro-convex portion by the conventional spin coating method described in Patent Document 1. It is presumed that this is because, even if the properties of the coating liquid are changed and even if the thickness of the coating is changed, the shape of the coating convex portion around the substrate protrusion is very similar to the shape of the substrate protrusion directly below it, based on the presence of the concavoconvex portion on the outermost surface of the eyeglass lens.

Claims

1. A method for manufacturing an eyeglass lens, the eyeglass lens comprising: a lens substrate having a plurality of substrate protrusions protruding from a substrate base on a surface of the lens substrate; and a coating provided so as to cover the plurality of substrate protrusions and having a plurality of concavities and convexities on an outermost surface, in, When the lens substrate is immersed in the coating liquid in a vertical direction or tilted from the vertical direction to the horizontal direction and pulled up, and the coating liquid on the lens substrate is dried while or after the coating liquid flows due to its own weight to form a coating: The viscosity of the curable composition for forming the coating on the surface of the lens substrate having the substrate protrusion is in the range of 1 to 50 mPa·s. The concentration of the curable composition when the lens substrate is impregnated is 1 to 50 wt %. The height of the protruding portion of the substrate is 0.7 to 0.9 μm, the thickness of the coating is 0.1 to 100 μm, Here, a value obtained by dividing the minimum value of the thickness of the coating covering the periphery of the protruding portion of the base material by the maximum value is 1 / 1.5 to 1 / 10.

2. The method for manufacturing a spectacle lens according to claim 1, wherein: The spectacle lenses can inhibit the progression of myopia.

3. The method for manufacturing a spectacle lens according to claim 1 or 2, wherein: The stray light rate of the eyeglass lens is less than 15%.

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