JP2012141407A - Manufacturing method of spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a spectacle lens which can manufacture a spectacle lens with a desired hue angle without preparing many kinds of dyeing agents.SOLUTION: There is provided a manufacturing method of a spectacle lens 1 in which a first organic film 51 with a high refractive index provided in a lens base material 2 and a second organic film 52 with a low refractive index provided in the first organic film 51 are included to constitute an antireflection layer 5, and the refractive index n of the first organic film 51 is made 2.00 or more and the film thickness of the first organic film 51 is made to change in a prescribed range to make a reflection color a color of a desired hue angle.

Description

  The present invention relates to a method of manufacturing a spectacle lens in which an organic film antireflection layer is provided on a base material.

In general, an antireflection layer is often provided on the surface of a spectacle lens.
There are various conventional examples of the antireflection layer. For example, the antireflective layer is formed by alternately laminating a plurality of thin films having a low refractive index and thin films having a high refractive index. There are some which consist of two layers with a low refractive index layer on the atmosphere side.
As an antireflection layer composed of two layers, a high refractive index layer made of titanium oxide or the like provided on the surface of a substrate such as glass and a low refractive index layer provided on the high refractive index layer ( Patent Document 1) and an organic antireflection layer composed of two layers of a high refractive index layer provided on a plastic substrate and a low refractive index layer provided on the atmosphere side (Patent Document 2).

In the conventional example of Patent Document 1, the refractive index of the high refractive index layer on the substrate side is set to 1.70 or more in order to make it difficult for the fingerprint to adhere without providing the antifouling layer of the fluorine-containing silane compound. The low refractive index layer on the side is a hydrophilic refractive index layer containing silicon oxide, and the refractive index is 1.35 to 1.45.
Since the conventional example of Patent Document 2 has sufficient antireflection characteristics even when a general-purpose plastic substrate having a refractive index of 1.67 or less is used, the refractive index of the high refractive index layer on the substrate side is 1. 6 to 2.0, the refractive index of the low refractive index layer on the atmosphere side is 1.3 to 1.5, and the refractive index of the high refractive index layer is 0.1 or more than the refractive index of the low refractive index layer It is a high one. The film thickness of the high refractive index layer is 100 to 200 nm.

JP 2010-167744 A JP 2008-46264 A

While it is desired that the spectacle lens has a higher antireflection property, it is also desired that the spectacle lens be colored to differentiate it from other spectacle lenses in appearance.
The conventional example of Patent Document 1 is for making it difficult for a fingerprint to adhere.
The conventional example of Patent Document 2 is for increasing the antireflection characteristic.
In the spectacle lenses shown in these Patent Documents 1 and 2, in order to obtain a desired hue angle, a staining solution or a dyeing agent must be prepared so that each hue angle can be colored.

  An object of the present invention is to provide a method of manufacturing a spectacle lens that can manufacture a spectacle lens having a desired hue angle without preparing various kinds of dyes and the like.

The present invention changes the idea of the conventional antireflection layer to give a larger antireflection function, and under the idea of obtaining a good appearance by actively reflecting from the spectacle lens while having the antireflection function. It was devised.
That is, in the method for producing a spectacle lens of the present invention, an antireflection layer is provided on the surface of a base material, the first organic film having a high refractive index provided on the base material, and the first organic film. A method for manufacturing a spectacle lens including a second organic film having a refractive index lower than that of the first organic film provided in the film, wherein the refractive index n of the first organic film is 2.00 or more, In addition, the thickness of the first organic film is changed so that the reflected color has a desired hue angle.

In the present invention having this configuration, when the thickness of the first organic film provided on the substrate is set to a predetermined thickness, a part of the incident light transmitted through the second organic film is reflected by the first organic film, A desired reflected color can be obtained by the reflected light. And in order to obtain desired reflected light, when manufacturing each spectacle lens, the spectacle lens with the characteristic on an external appearance can be provided by changing the thickness of a 1st organic film. Furthermore, since the thickness of the first organic film can be easily changed by changing the film forming conditions, it has a feature in appearance that is easier than when the substrate itself is colored with various kinds of dyes. Eyeglass lenses can be manufactured.
Here, the refractive index n of the first organic film was set to 2.00 or more in order to widen the color range obtained as the reflected color, and the thickness of the first organic film on the substrate side was changed. This is because when the second organic film on the atmosphere side is the outermost layer, the surface is easily scratched by making the second organic film too thin.

In this invention, the structure which makes the film thickness of said 1st organic film the range of 300 nm or more and 400 nm or less is preferable.
In the present invention having this configuration, the hue angle in a wide range can be obtained by changing the thickness of the first organic film in the range of 300 nm to 400 nm.

A configuration in which the refractive index n of the first organic film is 2.05 or less is preferable.
If the refractive index n of the first organic film exceeds 2.05, the luminous reflectance increases, which is not preferable.

A configuration in which the thickness of the second organic film is in the range of 100 nm to 160 nm is preferable.
By setting the film thickness of the second organic film within this range, the scratch resistance becomes good.

The partial expanded sectional view of the spectacle lens manufactured by one Embodiment of this invention. (A) is a ^* -b ^* figure in Example 1, (B) is a graph which shows the relationship between the wavelength and a reflectance. (A) is a ^* -b ^* figure in Example 2, (B) is a graph which shows the relationship between the wavelength and a reflectance. (A) is a ^* -b ^* figure in Example 3, (B) is a graph which shows the relationship between the wavelength and a reflectance. (A) is a ^* -b ^* figure in the comparative example 1, (B) is a graph which shows the relationship between the wavelength and a reflectance. (A) is a ^* -b ^* figure in the comparative example 2, (B) is a graph which shows the relationship between the wavelength and a reflectance. A ^* -b ^* figure in the comparative example 3. FIG. The graph which shows the relationship between the wavelength and the reflectance in the comparative example 3. The graph which shows the relationship between the film thickness and the hue angle in Examples 1 to 3 and Comparative Examples 1 and 2.

An embodiment of a method for manufacturing a spectacle lens according to the present invention will be described with reference to the drawings.
First, the spectacle lens 1 manufactured by this embodiment is demonstrated based on FIG.
FIG. 1 shows a partially enlarged cross section of the spectacle lens 1.
In FIG. 1, a spectacle lens 1 includes a lens base material 2, a primer layer 3 formed on the surface of the lens base material 2, a hard coat layer 4 formed on the surface of the primer layer 3, and the hard coat. And an organic antireflection layer 5 formed on the surface of the layer 4. An antifouling layer 6 may be provided on the organic antireflection layer 5 as necessary. The antifouling layer 6 is composed of an organic silicon compound containing fluorine. As the organic silicon compound containing fluorine, for example, a fluorine-containing silane compound can be preferably used.

The film thickness of the antifouling layer 6 is not particularly limited, but is preferably 0.001 to 0.5 μm.

(1. Lens substrate)
The refractive index of the lens base material 2 is not particularly limited, but is preferably 1.67 or less. As such a lens material, polythiourethane type produced by reacting diethylene glycol bisallyl carbonate (CR-39), polycarbonate, or a compound having an isocyanate group or an isothiocyanate group with a compound having a mercapto group. Examples include plastic.

(2. Primer layer)
The primer layer 3 is formed on the surface of the lens substrate 2 and plays a role of improving the durability of the entire surface treatment film.
Such a primer layer 3 is preferably formed using a coating composition containing an organic resin polymer having polarity and metal oxide fine particles containing titanium oxide. As the organic resin polymer, various resins such as a polyester resin, a polyurethane resin, an epoxy resin, a melamine resin, a polyolefin resin, a urethane acrylate resin, and an epoxy acrylate resin can be used.
In applying the coating composition, the surface of the lens substrate 2 is previously treated with alkali treatment, acid treatment, surfactant treatment, inorganic or organic fine particles for the purpose of improving the adhesion between the lens substrate 2 and the primer film. It is effective to perform peeling / polishing treatment and plasma treatment. As a coating / curing method of the coating composition, after coating the coating composition by dipping method, spin coating method, spray coating method, roll coating method, flow coating method or the like, at a temperature of 40 to 200 ° C. The primer layer can be formed by heating / drying for several hours.
The film thickness of the primer layer 3 is preferably in the range of 0.01 μm to 50 μm. If the primer layer 3 is too thin, basic performance such as water resistance and impact resistance cannot be realized. Conversely, if the primer layer 3 is too thick, surface smoothness is impaired, or appearance defects such as optical distortion, white turbidity, and cloudiness may occur. May occur.

(3. Hard coat layer)
The hard coat layer 4 is preferably formed using a coating composition containing metal oxide fine particles containing titanium oxide and an organosilicon compound represented by the formula (1).
R ¹ R ² _n SiX ¹ _3-n (1)
(In the formula, R ¹ is an organic group having a polymerizable reactive group, R ² is a hydrocarbon group having 1 to 6 carbon atoms, X ¹ is a hydrolytic group, and n is 0 or 1. is there.)
Titanium oxide preferably has a rutile crystal structure from the viewpoint of weather resistance and light resistance.
Examples of the organosilicon compound include vinyltrialkoxysilane, vinyltrichlorosilane, vinyltri (β-methoxy-ethoxy) silane, allyltrialkoxysilane, acryloxypropyltrialkoxysilane, methacryloxypropyltrialkoxysilane, and γ-glycid. Examples include xylpropyltrialkoxysilane, β- (3,4-epoxycyclohexyl) -ethyltrialkoxysilane, mercaptopropyltrialkoxysilane, γ-aminopropyltrialkoxysilane, and the like.

When producing a hard coat liquid, it is preferable to mix a sol in which metal oxide fine particles are dispersed with an organosilicon compound. The compounding amount of the metal oxide fine particles is determined by the hardness and refractive index of the hard coat layer, and is 5 to 80% by mass, particularly 10 to 60% by mass, based on the solid content in the hard coat liquid. It is preferable.
As a coating liquid application / curing method, a coating composition is applied by dipping, spin coating, spray coating, roll coating, or flow coating, and then heated at a temperature of 40 to 200 ° C. for several hours. A hard coat film is formed by drying. In addition, it is preferable that the film thickness of a hard-coat layer is 0.05-30 micrometers. If the film thickness is less than 0.05 μm, the basic performance cannot be realized. On the other hand, if the film thickness exceeds 30 μm, the surface smoothness may be impaired, or optical distortion may occur.

(4. Organic antireflection layer)
The organic antireflection layer 5 in the present embodiment includes a high refractive index first organic film 51 formed on the hard coat layer 4, and a refractive index that is provided on the first organic film 51 from the first organic film 51. And the second organic film 52 having a low thickness.
The first organic film 51 is located on the lens substrate side, and the second organic film 52 is located on the atmosphere side.

(4-1. High refractive index first organic film)
The first organic film 51 which is a high refractive index layer is preferably formed from a coating composition containing metal oxide fine particles containing titanium oxide and an organic silicon compound, or a coating composition containing an organic titanium compound. .
Here, as the titanium oxide, for example, metal oxide fine particles having an average particle diameter of 1 to 200 nm including a composite oxide having a rutile type crystal structure composed of titanium oxide and tin oxide, or titanium oxide, tin oxide and silicon oxide. (Composite fine particles). By using metal oxide fine particles containing titanium oxide having a rutile-type crystal structure, weather resistance and light resistance are further improved.
The type and blending amount of the metal oxide fine particles containing titanium oxide are determined by the target hardness, refractive index, etc., but the blending amount is 5% of the solid content in the coating composition for the high refractive index layer. It is desirable to be in the range of ˜80 mass%, particularly 10˜50 mass%. If the amount is too small, the abrasion resistance of the coating film may be insufficient. On the other hand, when there are too many compounding quantities, a crack will arise in a coating film and dyeing | staining property may become inadequate.
As the organosilicon compound, the organosilicon compound used in the hard coat layer is preferably used.

As the organic titanium compound, for example, a titanium coupling agent represented by the following formula (2) can be preferably used.
(R ⁴ O) _a TiR ⁵ _b R ⁶ _c (2)
(Where a + b + c = 4, a, b and c are integers selected from 0 to ⁴ , R ⁴ , R ⁵ and R ⁶ are hydrogen or a saturated or unsaturated hydrocarbon group, A functional group may be introduced into the hydrogen group.)
As the hydrocarbon group, those having 1 to 10 carbon atoms are preferred, and those having 1 to 6 carbon atoms are more preferred. Particularly preferably, for example, as R ⁴ , isopropoxyl and n-butoxy group can be exemplified, and R ⁵ and R ⁶ are acetonato having a vinyl group, an epoxy group, a methacryl group, an amino group, and a mercapto group, Aminato group can be raised.

(4-2. Second organic film with low refractive index)
The second organic film 52 constituting the low refractive index layer is preferably formed from a coating agent containing silica-based fine particles having internal cavities (hereinafter also referred to as “hollow silica-based fine particles”) and an organosilicon compound. .
Here, the hollow silica-based fine particles are used because the internal cavity contains a gas or solvent having a refractive index lower than that of silica, so that the refractive index is reduced compared with silica-based fine particles without cavities. This is because a lower refractive index of the refractive index layer is achieved. In the present embodiment, it is desirable to use one having an average particle diameter in the range of 1 to 150 nm and a refractive index in the range of 1.16 to 1.39.
Further, as the organosilicon compound, the same organosilicon compound (formula (1)) used for constituting the first organic film 51 described above may be used.
Further, as the organosilicon compound, a fluorine-containing compound as shown in the following formula (3) may be used.
^{_{X 2 m R 3 3-m}} Si-Y-SiR 3 3-m X 2 m (3)
(Wherein R ³ is a monovalent hydrocarbon group having 1 to 6 carbon atoms, Y is a divalent organic group containing one or more fluorine atoms, X ² is a hydrolyzable group, and m is an integer of 1 to 3). .)
Similarly to the organosilicon compound, the fluorine-containing compound represented by the formula (3) finally functions as a binder resin for the silica-based fine particles in the organic antireflection layer. In addition, when such a fluorine-containing compound is used, it is easier to lower the refractive index of the organic antireflection layer due to the low refractive index inherent in the fluorine-containing compound.
R ³ represents a monovalent hydrocarbon group having 1 to 6 carbon atoms, specifically, an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, or a cyclohexyl group, a phenyl group, or the like. It can be illustrated. A methyl group is preferred for obtaining good scratch resistance. m is an integer of 1 to 3, preferably 2 or 3, and m = 3 is particularly preferable for a highly hard film. X represents a hydrolyzable group. Specific examples thereof include halogen atoms such as Cl, organooxy groups represented by OR _X (R _X is a monovalent hydrocarbon group having 1 to 6 carbon atoms), particularly methoxy group, ethoxy group, propoxy group, isopropoxy group, Examples include alkoxy groups such as butoxy groups, alkenoxy groups such as isopropenoxy groups, acyloxy groups such as acetoxy groups, ketoxime groups such as methylethyl ketoxime groups, and alkoxyalkoxy groups such as methoxyethoxy groups.

In the formula (3), the number of fluorine atoms is preferably 4 to 50, particularly preferably 4 to 24. In order to develop various functions such as antireflection, antifouling, and water repellency, it is preferable to contain a large amount of fluorine atoms. In some cases, scratch resistance cannot be obtained.
This coating composition contains an epoxy group-containing organic compound containing one or more epoxy groups in the molecule in order to improve the scratch resistance (wear resistance) of the organic antireflection layer 5. Is preferred. Examples of such an epoxy group-containing organic compound include glycidoxymethyltrimethoxysilane, glycidoxymethyltriethoxysilane, α-glycidoxyethyltrimethoxysilane, α-glycidoxyethyltriethoxysilane, β -Glycidoxyethyltriethoxysilane, β-glycidoxypropyltrimethoxysilane, α-glycidoxypropyltrimethoxysilane, α-glycidoxypropyltriethoxysilane, β-glycidoxypropyltriethoxysilane, γ -Glycidoxypropyltrimethoxysilane, (3,4-epoxycyclohexyl) methyltrimethoxysilane, γ-glycidoxypropylvinyldiethoxysilane, γ-glycidoxypropylphenyldiethoxysilane, δ- (3,4 -Epoxycyclohexyl) butyltrie Toxisilane and the like can be mentioned.

The coating composition used for forming the first organic film 51 constituting the high refractive index layer and the second organic film 52 constituting the low refractive index layer includes silicone, acrylic, epoxy, urethane, and melamine. You may use together resin, such as. Among these, in consideration of various properties such as heat resistance, chemical resistance, and scratch resistance as a plastic lens, it is preferable to include a silicone resin and an epoxy resin. It is also possible to add a particulate inorganic substance or the like for adjusting the refractive index. Examples of the particulate inorganic substance to be added include colloidally dispersed sol. From the viewpoint of lowering the refractive index of the low refractive index layer, magnesium fluoride sol, calcium fluoride sol, and the like can be given.
The coating composition for forming the first organic film 51 and the second organic film 52 includes a small amount of a curing catalyst, a photopolymerization initiator, an acid generator, a surfactant, a charge as necessary. Addition of light stabilizers such as hindered amines and hindered phenols, disperse dyes, oil-soluble dyes, fluorescent dyes, pigments, etc. Later coating performance can be improved.

The organic antireflection layer 5 composed of the first organic film 51 and the second organic film 52 can be suitably formed as an organic thin film on the hard coat layer 4 by a wet method using the coating composition described above. .
As a method for forming the organic antireflection layer 5 by a wet method, a known method such as a dipping method, a spinner method, a spray method, or a flow method can be used. When forming the organic antireflection layer 5 on the hard coat layer 4, it is preferable to perform a pretreatment on the surface of the hard coat layer 4.
The specific formation method of the organic antireflection layer 5 is basically the same for the first organic film 51 and the second organic film 52, and is performed by the following procedure.
First, the organosilicon compound is diluted with an organic solvent, and then hydrolyzed by adding water, dilute hydrochloric acid, acetic acid or the like as necessary. Further, a system in which metal oxide fine particles or hollow silica fine particles are colloidally dispersed in an organic solvent is added. Thereafter, if necessary, a curing catalyst, a photopolymerization initiator, an acid generator, a surfactant, an ultraviolet absorber, an antioxidant, and the like are added, and after sufficiently stirring, used as a coating composition. In the case of using an organic titanium compound in the high refractive index layer, it is not necessary to add metal oxide fine particles.
At this time, the concentration of the coating liquid diluted with respect to the solid content after curing is preferably 0.5 to 15% by mass, and more preferably 1 to 10% by mass as the solid content concentration. When the solid content concentration exceeds 15% by mass, it is difficult to obtain a predetermined film thickness even if the pulling speed is slowed by the dipping method or the rotational speed is increased by the spinner method. Will be thicker than necessary. If the solid content concentration is less than 0.5% by mass, the film thickness becomes thinner than necessary even if the pulling speed is increased by the dipping method or the rotation speed is decreased by the spinner method. It is difficult to obtain the film thickness. Also, if the speed is made too fast or the rotational speed is made too slow, the coating unevenness on the lens tends to increase, and even when a surfactant or the like is added, the corresponding partition cannot be made.
After the coating liquid is applied to the lens substrate, it is cured by heat or ultraviolet light and a combination thereof to obtain an organic antireflection layer, but it is preferably cured by heat treatment. The heating temperature in the heat treatment is determined in consideration of the composition of the coating liquid, the heat resistance of the lens substrate, and the like, but is preferably 50 to 200 ° C, more preferably 80 to 140 ° C.

A preferable value as the refractive index n of the organic antireflection layer 5 is 2.00 or more and 2.05 or less in the first organic film 51 constituting the high refractive index layer, and the second organic constituting the low refractive index layer. In the film 52, it is 1.3 or more and 1.5 or less.
The difference in refractive index n between the two layers is 0.1 or more, preferably 0.15 or more, and more preferably 0.20 or more. When the difference in refractive index n between the two layers is smaller than 0.1, the antireflection effect is lowered.
The film thickness of the first organic film 51 is in the range of 300 nm to 400 nm, and the film thickness of the second organic film 52 is in the range of 100 nm to 160 nm.
The first organic film 51 and the second organic film 52 are uniform regardless of their parts, for example, the central part and the peripheral part.
In the present embodiment, under the above-described conditions, the thickness of the first organic film 51 is changed so that the reflected color has a desired hue angle.

Next, an embodiment showing the relationship between the refractive index n and the film thickness of the first organic film 51 will be described with reference to FIGS.
2A to 6A, the first organic film 51 is provided on the lens substrate 2 having a refractive index of 1.67, and the refractive index is 1.40 on the first organic film 51. In the spectacle lens provided with the second organic film 52 having a film thickness of 100 nm, an a ^* -b ^* diagram in the case where the refractive index of the first organic film 51 is changed is shown. A graph showing the relationship is shown. A D65 light source was used as the light source.
(A) in each figure is an a ^* -b ^* figure (chromaticity diagram), the horizontal axis shows a ^* , red becomes stronger toward the right side (+) with respect to 0, and on the left side (-). The green becomes stronger as you go. The vertical axis indicates b ^*, and yellow increases as it goes upward (+) with respect to 0, and blue increases as it goes downward (−). For example, the region between the positive side of the horizontal axis indicated by a ^* and the positive side of the vertical axis indicated by b ^* reflects a mixed color of red and yellow, and as it approaches the horizontal axis Redness becomes deep yellow, and redness becomes light yellow as it approaches the vertical axis.
In (A) of each figure, the chromaticity of the sample in which the film thickness of the first organic film 51 is 300 nm is indicated by P1, and the chromaticity of the sample in which the film thickness is 350 nm is indicated by P2, and is 400 nm. The chromaticity of the sample is indicated by P3. The chromaticity of the sample whose film thickness is finely set between 300 nm and 400 nm is displayed as a locus S passing through the points P1, P2, and P3.

FIG. 2B to FIG. 6B show the relationship between the wavelength and the reflectance when the thickness of the first organic film 51 is set to 300 nm, 350 nm, and 400 nm as a sample.
Here, the reflectance is determined by an existing method, and is specifically obtained from the following equation.
In general, the reflectance R when a single thin film is formed on a substrate is obtained by the product of the matrix M of the film and the matrix Ms of the substrate. This result is shown as in equation (4). In equation (4), when n is the real part of the refractive index, k is the imaginary part of the refractive index, and i is the imaginary number, the complex refractive index N can be obtained from the equation N = n−ik. δ is a retardation film thickness, and is obtained as δ = 2πNd cos θ / λ, where θ is the incident angle of light, λ is the wavelength, and d is the physical film thickness.

  Here, the optical admittance Y is expressed as shown in Equation (5).

  The optical admittance Y is a numerical value that can be handled in the same manner as the refractive index. From this, Equation (6) is used to obtain the amplitude reflection coefficient and the amplitude transmission coefficient. That is, since light is always reflected at the boundary surface formed by two different media, the amplitude reflection coefficient r at the boundary surface can be expressed by Expression (6). In equation (6), ρ is the ratio of the refractive indices.

To find the reflectivity of the air / thin film / substrate system when a thin film is formed on the substrate, simply find the reflectivity at the simple interface between the input medium with admittance η ₀ and the medium with admittance Y. It becomes. Therefore, from equation (6), the amplitude reflection coefficient r is represented by equation (7), and the reflectance R is represented by equations (8) and (9). r ^* is a conjugate complex number of r.

[Example 1]
The refractive index of the lens substrate 2 is 1.67, the refractive index of the second organic film 52 is 1.40, and the film thickness is 100 nm.
The refractive index n of the first organic film 51 is 2.00.
In FIG. 2A, the chromaticity at the film thickness finely set between 300 nm and 400 nm is set as a locus S passing through the points P1, P2, and P3. The trajectory S is displayed in a substantially elliptical shape when a ^* is between 0 and 20 and b ^* is between −25 and +5.
Then, as shown in FIG. 2B, in the area where the wavelength is 480 to 700 nm, the reflectance does not exceed 4% in each film thickness. In addition, regarding the reflectance measurement, a reflectance spectral film thickness meter (manufacturer: Otsuka Electronics Co., Ltd., model number: FE-3000) was used.
[Example 2]
The conditions are the same as in Example 1 except that the refractive index n of the first organic film 51 is set to 2.05.
As can be seen from the locus S in FIG. 3A, the a ^* is displayed between -5 and 25, the b ^* is between -25 and +10, and is displayed in a substantially elliptical shape with one end opened.
As shown in FIG. 3B, the reflectance does not exceed 4% in each film thickness in the area where the wavelength is 480 to 700 nm.

[Example 3]
The conditions are the same as in Example 1 except that the refractive index n of the first organic film 51 is 2.10.
Figure 4 As can be seen from the trajectory S of (A), when the refractive index n is 2.10, ^{a *} is between -5 to 25, ^{b *} is displayed in a substantially elliptical shape between +12 -15 Is done.
Then, as shown in FIG. 4B, the reflectance at each film thickness does not exceed 4% only in an area with a wavelength of 500 to 650 nm.

[Comparative Example 1]
The conditions are the same as in Example 1 except that the refractive index n of the first organic film 51 is set to 1.90.
As can be seen from the locus S in FIG. 5A, when the refractive index n is 1.90, the a ^* is linearly displayed between 8 and 15 and the b ^* is between −20 and −10. Will be. Then, as shown in FIG. 5B, in the area where the wavelength is 450 to 700 nm, the reflectance does not exceed 4% in each film thickness.
[Comparative Example 2]
The conditions are the same as in Example 1 except that the refractive index n of the first organic film 51 is set to 1.95.
As can be seen from the trajectory S of FIG. 6 (A), when the refractive index n is 1.95, ^{a *} is displayed in an oval shape between between 1 and 18, ^{b *} is between 0 and -25 It will be. Then, as shown in FIG. 6B, in the area where the wavelength is 450 to 700 nm, the reflectance does not exceed 4% in each film thickness.

[Comparative Example 3]
(Sample 1)
A lens substrate having a refractive index of 1.67 was used. A high refractive index layer corresponding to the first organic film was formed on the surface of the lens substrate, and a low refractive index layer corresponding to the second organic film was formed on the high refractive index layer. The refractive index of the high refractive index layer is 1.80, the film thickness is 150 nm, the refractive index of the low refractive index layer is 1.37, and the film thickness is 100 nm.
(Sample 2)
In sample 2, a primer layer and a hard coat layer were formed on the upper surface of the lens substrate, and then an antireflection layer was formed in the same manner as in sample 1, and an antifouling layer was further formed thereon. The primer layer has a thickness of 0.5 μm and a refractive index of 1.67, and the hard coat layer has a thickness of 2.3 μm and a refractive index of 1.67. The antireflection layer is the same as Sample 1.

(Sample 3)
The lens substrate is the same as Sample 2 except that a lens base having a refractive index of 1.60 is used.
(Sample 4)
The same as Sample 2, except that a lens substrate having a refractive index of 1.59 was used.

(Sample 5)
The same as sample 2 except that a lens substrate having a refractive index of 1.60 is used, the refractive index of the high refractive index layer is 1.85, and the film thickness is 148 nm.
(Sample 6)
The same as Sample 5 except that a lens substrate having a refractive index of 1.59 was used.

(Sample 7)
The same as Sample 2, except that the primer layer, hard coat layer, low refractive index layer and antifouling layer were formed without forming the high refractive index layer.
(Sample 8)
The same as Sample 3, except that the primer layer, hard coat layer, low refractive index layer and antifouling layer were formed without forming the high refractive index layer.
(Sample 9)
It is the same as Sample 4 except that the primer layer, the hard coat layer, the low refractive index layer, and the antifouling layer are formed without forming the high refractive index layer.
The results of the above samples 1 to 9 are shown in FIGS.
FIG. 7 is an a ^* -b ^* diagram of Samples 1-9. In FIG. 7, the chromaticities corresponding to the samples 1 to 9 are displayed as S1 to S9. FIG. 8 shows the relationship between the wavelength and reflectance in Samples 1-9.

When Examples 1 to 3 and Comparative Examples 1 to 3 are compared, it can be seen that the range of chromaticity that can be used as a reflected color is widened by setting the refractive index n of the first organic film to 2.00 or more.
That is, in FIG. 2A in which Example 1 is shown, the refractive index of the first organic film 51 can be seen from the locus S including the chromaticity points P1, P2, and P3 having film thicknesses of 300 nm, 350 nm, and 400 nm. When n is 2.00, the trajectory S is displayed in an approximately elliptical shape when a ^* is between 0 and 20 and b ^* is between −25 and +5, and the reflected color is The range is wide, such as yellow, blue with strong redness, and blue with weak redness.
In FIG. 3A in which Example 2 is shown, the refractive index n of the first organic film 51 is, as can be seen from the locus S including chromaticity points P1, P2, and P3 having film thicknesses of 300 nm, 350 nm, and 400 nm. In the case of 2.05, an a ^* is between −5 and 25 and b ^* is between −25 and +10, and the reflected color range is wider than in the first embodiment. .
In FIG. 4A in which Example 3 is shown, as can be seen from the locus S including chromaticity points P1, P2, and P3 with film thicknesses of 300 nm, 350 nm, and 400 nm, a ^* is between −5 and 21, The b ^* is displayed in a substantially elliptical shape with a short axis between −15 and +12, and the reflected color range is wider than in the first and second embodiments.

On the other hand, in Comparative Example 1 where the refractive index n is 1.90, as shown in FIG. 5A, the trajectory S has a ^* between 8 and 15 and b ^* between −20 and −10. It can be seen that the range of colors reflected is extremely limited.
In Comparative Example 2 having a refractive index n is 1.95, as shown in FIG. 6 (A), the trajectory S is displayed on the elliptical shape between the period from 1 ^{a *} 18, ^{b *} is between 0 and -25 Thus, although not as much as the refractive index n is 1.90, the range of reflected colors is limited.
And in the comparative example 3, as FIG. 7 shows, the samples 1-9 are settled in the very narrow area centering on 0, and cannot obtain a deep color as a reflected color. Furthermore, even if the high refractive index layer corresponding to the first organic film is selected in Samples 1 to 6 as in the present embodiment, the color of the obtained reflected color is extremely limited.

Next, the relationship between the film thickness of the first organic film 51 and the hue angle will be described.
FIG. 9 shows the relationship between the film thickness and the hue angle in Examples 1 to 3 and Comparative Examples 1 and 2.
In FIG. 9, when the refractive index n is 1.95 or more, the film thickness of the first organic film 51 can obtain a large range of hue angles in the range of 300 nm to 400 nm. On the other hand, when the film thickness exceeds 400 nm and is 500 nm or less, the hue angle range is small.
Further, when the refractive index is 1.95, the hue angle changes abruptly between 350 nm and 400 nm, so it is difficult to obtain the desired hue angle by changing the film thickness.

Next, an embodiment relating to the film thickness of the second organic film 52 which is a low refractive index layer will be described.
Samples were prepared when the thickness of the second organic film 52 was 80 nm, 100 nm, 130 nm, and 160 nm, and a scratch test was performed on each sample. The conditions for the first organic film 51 and the lens substrate are the same as those in the first embodiment.
In the abrasion test, steel wool # 0000 was applied to the lens surface with a load of 1 kg, and after rubbing a distance of 3 to 4 cm for 10 reciprocations, the condition of the scratches that entered the lens surface was visually evaluated according to the following five levels A to E. Evaluation based on the criteria.
[Evaluation criteria]
A: No scratches B: 1 to 5 scratches are confirmed C: 6 to 20 scratches are confirmed D: There are 21 or more scratches but it is not visible in cloudy E: Many Scratched and almost cloudy

[Test results]
Film thickness is 80nm Rank B
Film thickness is 100nm Rank A
Film thickness is 130nm Rank A
Film thickness is 160nm Rank A
That is, when the film thickness is 100 nm or more, the scratch resistance is very good, and when the film thickness is 80 nm, some scratches are generated, which is not preferable. That is, in the present embodiment, considering the scratch resistance, the thickness of the second organic film 52 is preferably in the range of 100 nm to 160 nm.

Therefore, in the present embodiment, the following operational effects can be achieved.
(1) The antireflection layer 5 includes a first organic film 51 having a high refractive index provided on the lens substrate 2 and a second organic film 52 having a low refractive index provided on the first organic film 51. The spectacle lens 1 is manufactured by changing the refractive index n of the first organic film 51 to 2.00 or more and changing the film thickness of the first organic film 51 within a predetermined range. A desired hue angle is selected. That is, in order to make the reflected light have a desired color, a part of incident light that passes through the second organic film 52 is set by setting the thickness of the first organic film 51 provided on the lens substrate 2 to a predetermined value. Is reflected by the first organic film 51 to improve the appearance of the spectacle lens 1. A part of the incident light is reflected by the first organic film 51 to reduce the amount of light incident on the eye of the spectacle user, but there is no problem because the amount is small. And when manufacturing each spectacle lens 1, by changing the film thickness of the 1st organic film 51, a different reflective color can be obtained for every spectacle lens, and the spectacle lens with the characteristic in appearance is provided. be able to. Furthermore, since the film thickness of the first organic film 51 can be easily changed by changing the film formation conditions, it is possible to manufacture a spectacle lens having a characteristic in appearance as compared with the case where the lens substrate itself is colored. it can.

(2) Since the thickness of the first organic film is in the range of 300 nm to 400 nm, a hue angle in a wide range can be obtained. Thereby, diversification of the external appearance of the spectacle lens 1 manufactured can be achieved.

(3) Since the refractive index n of the first organic film 51 is 2.05 or less, the luminous reflectance can be kept low. In other words, when the refractive index n is 2.10, the reflectance increases and inconvenience arises.
(4) Since the thickness of the second organic film 52 is in the range of 100 nm or more and 160 nm or less, the scratch resistance is good.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that modifications and improvements within the scope of achieving the objects and effects of the present invention are included in the contents of the present invention. Absent.
For example, the spectacle lens 1 does not necessarily need to be provided with the primer layer 3 and the hard coat layer 4.

  The present invention can be used for a spectacle lens in which an organic film antireflection layer is provided on a base material.

  DESCRIPTION OF SYMBOLS 1 ... Eyeglass lens, 2 ... Lens base material, 3 ... Primer layer, 4 ... Hard-coat layer, 5 ... Antireflection layer, 6 ... Antifouling layer, 51 ... 1st organic film, 52 ... 2nd organic film

Claims (4)

An antireflection layer is provided on the surface of the base material, the first organic film having a high refractive index provided on the base material, and the refractive index of the first organic film from the first organic film. A method for producing a spectacle lens comprising a low second organic film,
Manufacturing a spectacle lens, characterized in that the refractive index n of the first organic film is 2.00 or more and the thickness of the first organic film is changed so that the reflected color has a desired hue angle. Method. In the manufacturing method of the spectacle lens according to claim 1,
A method for manufacturing a spectacle lens, wherein the first organic film has a thickness in a range of 300 nm to 400 nm.
In the manufacturing method of the spectacle lens according to claim 2,
A method for manufacturing a spectacle lens, wherein the refractive index n of the first organic film is 2.05 or less. In the manufacturing method of the spectacle lens in any one of Claims 1-3,
A method for manufacturing a spectacle lens, wherein the second organic film has a thickness in a range of 100 nm to 160 nm.

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