JP2023076677A - Spectacle lens - Google Patents

Abstract

To provide a spectacle lens excellent in scratch resistance and heat resistance.SOLUTION: The spectacle lens includes at least one of a hard coat film and an antireflection film on at least one of an object side surface and an eyeball side surface of a lens base material. The at least one of a hard coat film and an antireflection film consists of or includes at least two types of layers with different physical properties, where at least one of the layers is patterned.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a spectacle lens having a hard coat layer and an antireflection layer covering the surface of a lens substrate.

A spectacle lens comprises various layers covering the surface of the lens substrate. For example, a hard coat layer to prevent scratches on the lens substrate, an antireflection layer to prevent light reflection on the lens surface, and a water-repellent layer to prevent water stains on the lens. and an anti-fogging layer for preventing the lens from fogging.

Patent Literature 1 discloses a coating liquid using a functional silane compound that achieves adhesion and scratch resistance of a coating film. Further, Patent Document 2 discloses a method for producing a coating composition for improving physical properties such as scratch resistance, adhesion, and water resistance.

JP 2010-30993 A JP 2008-19364 A

Spectacle lenses are subject to relatively harsh handling considering the frequency of attachment and detachment and the environment in which they are used. Therefore, spectacle lenses are required to have particularly high scratch resistance, and for this reason, it is desirable to use a material as hard as possible for the film that covers the surface of the lens substrate. As disclosed in Patent Literature 1, Patent Literature 2, etc., various proposals have been made for compositions for improving scratch resistance. However, since the coating film obtained by coating and curing such a composition becomes a hard film, although it has excellent scratch resistance, cracks may occur in the coating film depending on the temperature environment in which the spectacle lens is used, for example. There is a problem that When such cracks occur, the visibility of the spectacle lens when worn is greatly affected. In the past, scratch resistance was prioritized at the expense of heat resistance to some extent, but in recent years, the environment in which people use spectacle lenses, especially the temperature environment, is varied, and even in fairly harsh temperature environments, problems have arisen. Heat resistance is now required as an important property.

However, as described above, in the prior art, when scratch resistance is prioritized, heat resistance must be sacrificed to some extent, and it is difficult to achieve both scratch resistance and heat resistance.

Therefore, the present invention has been made in view of such conventional problems, and an object of the present invention is to provide spectacles that are excellent in both scratch resistance and heat resistance and have both scratch resistance and heat resistance. to provide the lens.

In order to solve the above problems, the present invention has the following configurations.
(Configuration 1)
A spectacle lens having at least one of a hard coat film and an antireflection film on at least one of an object-side surface and an eyeball-side surface of a lens substrate, wherein the hard coat film and the antireflection film At least one of the films is composed of at least two types of layers with different physical properties, or includes at least two types of layers with different physical properties, at least one of which is formed in a pattern. spectacle lenses.

(Configuration 2)
The spectacle lens according to configuration 1, wherein the physical property is hardness.
(Composition 3)
The spectacle lens according to Configuration 1, wherein the physical property is a contact angle.

(Composition 4)
At least one of the hard coat film and the antireflection film comprises a first layer and a second layer having different physical properties, or includes a first layer and a second layer having different physical properties, and The spectacle lens according to any one of Structures 1 to 3, wherein the second layer is formed in a pattern on the first layer formed on the entire surface of the lens substrate.
(Composition 5)
The spectacle lens according to configuration 4, wherein the first layer is a low-hardness layer and the second layer is a high-hardness layer.

(Composition 6)
At least one of the hard coat film and the antireflection film comprises a first layer and a second layer having different physical properties, or includes a first layer and a second layer having different physical properties, 4. The spectacle lens according to any one of structures 1 to 3, wherein both the first layer and the second layer are formed in a pattern.
(Composition 7)
The pattern area of the first layer is larger than the pattern area of the second layer, the first layer is a low hardness layer, and the second layer is a high hardness layer. A spectacle lens according to configuration 6.

(Composition 8)
8. The spectacle lens according to any one of configurations 1 to 7, wherein the pattern is mesh-like or dot-like.

According to the spectacle lens of the present invention, it is possible to obtain a spectacle lens that is excellent in both scratch resistance and heat resistance and that achieves both scratch resistance and heat resistance.

1 is a cross-sectional view of a spectacle lens according to a first embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view of a spectacle lens according to a modification of the first embodiment; FIG. 3 is a partially enlarged plan view of the spectacle lens of FIG. 2 viewed from the direction of the object-side surface; FIG. 3 is a diagram showing an example of a manufacturing process of the spectacle lens of FIG. 2; 3 is a diagram showing another example of a manufacturing process of the spectacle lens of FIG. 2; FIG. It is a figure which shows the grid-like mesh pattern example. It is a figure which shows the pattern example of a dot shape. FIG. 5 is a cross-sectional view of a spectacle lens according to a second embodiment of the present invention;

EMBODIMENT OF THE INVENTION Hereinafter, it explains in full detail, referring drawings for the form for implementing this invention.

[First embodiment]
FIG. 1 is a sectional view of a spectacle lens according to a first embodiment of the invention.
<Structure of spectacle lens>
The spectacle lens 1 of this embodiment has a hard coat film formed on a spectacle lens base material to protect the lens surface from scratches and the like.

Specifically, with reference to FIG. 1, the spectacle lens 1 of the present embodiment has a hard coat film composed of two types of layers having different physical properties on the convex surface of a lens substrate 11 having a convex surface on the object side. have. In the present embodiment, the two types of layers with different physical properties are two types of layers with different hardness, and the second layer is formed on the first layer formed on the entire surface of the lens substrate 11 It is formed in a pattern. The first layer is the low hardness layer 12L, and the second layer is the high hardness layer 12H. That is, in the present embodiment, a hard coat film composed of two types of layers having different hardness is provided on the lens substrate 11, and the low-hardness layer 12L formed on the entire surface of the lens substrate 11 In addition, a high hardness layer 12H is formed in a pattern. Examples of the pattern of the high-hardness layer 12H include a lattice mesh pattern as shown in FIG. 6 and a dot-shaped pattern as shown in FIG. 7, but the present invention is limited to these patterns. not something to do.

<Lens substrate>
The lens substrate 11 in the present embodiment has a first main surface (convex surface on the object side), a second main surface (eyeball side surface), and an edge surface (edge).
The material of the lens substrate 11 may be plastic or inorganic glass, and various substrates that are commonly used for plastic lenses can be used. A lens substrate can be manufactured by injecting a lens monomer into a lens-forming mold and performing a curing treatment.

The lens monomer is not particularly limited, and various monomers commonly used in the production of plastic lenses can be used. For example, those having a benzene ring, naphthalene ring, ester bond, carbonate bond, or urethane bond in the molecule can be used. Compounds containing sulfur and halogen elements can also be used, and in particular compounds having a halogen-substituted aromatic ring at the nucleus can also be used. A lens monomer can be produced by using one or two or more monomers having the above functional groups. For example, styrene, divinyl benzene, phenyl (meth) acrylate, benzyl (meth) acrylate, naphthyl (meth) acrylate, methyl (meth) acrylate, diethylene glycol bisallyl carbonate, diallyl (iso) phthalate, dibenzyl itaconate, dibenzyl fuma chlorostyrene, halogen-substituted styrene, halogen-substituted phenyl (meth)acrylate, halogen-substituted benzyl (meth)acrylate, (di)(meth)acrylate of tetrabromobisphenol A derivative, diallyl carbonate of tetrabromobisphenol A derivative , diorthochlorobenzyl itaconate, diorthochlorobenzyl fumarate, diethylene glycol bis(orthochlorobenzyl) fumarate, (di)ethylene glycol di(meth)acrylate, glycidyl methacrylate, xylylene diisocyanate, hexamethylene diisocyanate and other polyfunctional isocyanates reaction product of nuclear halogen-substituted phenol derivative monohydroxy acrylate and polyfunctional isocyanate, reaction product of nuclear halogen-substituted biphenyl derivative monohydroxy acrylate and polyfunctional isocyanate, reaction product of xylene diisocyanate and polyfunctional mercaptan, glycidyl methacrylate and polyfunctional methacrylates, and mixtures thereof. Preferred examples of materials for the lens substrate include polyurethane-based materials such as polythiourethane resin and polyurethane resin, epithio-based materials such as polysulfide resins, polycarbonate-based materials, and diethylene glycol bisallyl carbonate-based materials.

As the lens substrate 11, a colorless one is usually used, but a colored one can be used as long as the transparency is not impaired.
The refractive index of the lens substrate 11 is, for example, 1.50 or more and 1.74 or less.
The lens substrate 11 may be either a finish lens or a semi-finish lens.

In this embodiment, the surface shape of the lens substrate 11 on the object side, for example, is convex, but the surface shape of the lens substrate 11 is not particularly limited, and may be flat, convex, concave, or the like.

The spectacle lens 1 of this embodiment may be a single focal lens, a multifocal lens, a progressive power lens, or the like. In a progressive-power lens, a near portion region (near portion) and a progressive portion region (intermediate portion) are usually included in the lower portion, and a distance portion portion (far portion) is included in the upper portion.

<Hard coat film>
The hard coat film can impart scratch resistance to the plastic lens.
As a method for forming a hard coat film, a method of applying a curable composition to the surface of a lens substrate by spin coating or the like and curing the coating film is generally used. Curing treatment is performed by heating, light irradiation, or the like, depending on the type of the curable composition. As such a curable composition, for example, the main components are a silicone compound that generates silanol groups upon irradiation with ultraviolet rays and an organopolysiloxane having reactive groups such as halogen atoms and amino groups that undergo a condensation reaction with the silanol groups. A photocurable silicone composition, an acrylic UV-curable monomer composition, inorganic fine particles such as SiO ₂ and TiO ₂ are subjected to hydrolysis of a polymerizable group such as a vinyl group, an allyl group, an acrylic group or a methacrylic group and a methoxy group. A silane compound having a functional group and a thermosetting composition containing inorganic fine particles dispersed in a silane coupling agent are preferred. The composition of the hard coat film is selected according to the material of the lens substrate 11 . The refractive index of the hard coat film is, for example, 1.45 or more and 1.74 or less.

The method for forming the high-hardness layer 12H in a desired pattern is not particularly limited, but for example, a method of performing pattern printing by applying an inkjet recording method is preferable.

As described above, in the present embodiment, the hard coat film is composed of two types of layers having different hardnesses, the low hardness layer 12L formed over the entire surface of the lens substrate 11 and the patterned hard coat layer 12L formed thereon. and a high hardness layer 12H. Note that the above-mentioned “whole surface” does not include the edge surface (edge) of the lens substrate 11 .

The above "hardness" can be evaluated, for example, by indentation hardness (hardness). The indentation hardness referred to here is a value obtained from a displacement-load curve from loading to unloading of the measuring indenter, and is defined in ISO 14577:2000.

For example, using a micro-indentation hardness tester (for example, Elionix ultra-micro-indentation hardness tester ENT-2100), it corresponds to the indentation load P (mgf) throughout the entire process from the start of loading at the measurement point to unloading. The indentation depth h (nm) is continuously measured to create a Ph curve. The indentation hardness H can be obtained from the created Ph curve by the following formula.
H (mgf/μm ² )=Pmax/A
(Here, Pmax: Maximum load (mgf), A: Indenter projected area (μm ² ))

The indentation hardness measured as described above is the hardness (hardness) per unit area (μm ² ) at the measurement location (measurement point) in the film thickness direction (depth direction).

From the viewpoint of preventing cracks in the hard coat film, the low-hardness layer 12L preferably has an indentation hardness in the range of 50 to 110 mgf/μm ² . From the viewpoint of scratch resistance, the high hardness layer 12H preferably has an indentation hardness in the range of 100 to 200 mgf/μm ² . It should be noted that the indentation hardness can be adjusted, for example, by changing the type of curing composition for the hard coat film, curing conditions, and film thickness.
It should be noted that the same applies to modified examples described later.

In this embodiment, the hard coat film is composed of the low-hardness layer 12L formed on the entire surface of the lens substrate 11 and the high-hardness layer 12H formed thereon in a pattern. , the occurrence of cracks in the hard coat film can be prevented even in a high-temperature environment, and the heat resistance is improved. Moreover, excellent scratch resistance is obtained by the high hardness layer 12H. That is, the spectacle lens 1 of the present embodiment is excellent in both scratch resistance and heat resistance, and can achieve both scratch resistance and heat resistance, which could not be achieved by conventional techniques.

If the pattern area of the high-hardness layer 12H formed in a pattern is small, the high-hardness layer 12H may not provide sufficient scratch resistance. It is desirable that the area ratio to the area of the entire surface of the base material 11 is 50% or more.

Next, a modification of the first embodiment described above will be described.
2A and 2B are cross-sectional views of spectacle lenses according to modifications of the first embodiment described above.
In the modification shown in FIG. 2A, on the lens substrate 11, a hard coat film composed of two types of layers having different hardnesses (a low hardness layer 12L and a high hardness layer 12H) is provided. and the high hardness layer 12H are both formed in a pattern. Examples of the patterns of the low hardness layer 12L and the high hardness layer 12H include a grid-like mesh pattern as shown in FIG. 6 and a dot-shaped pattern as shown in FIG.

In addition, in the modification shown in FIG. 2B, as in the modification shown in FIG. It has a hard coat film consisting of a hardness layer 12H), and both the low hardness layer 12L and the high hardness layer 12H are formed in a pattern. are formed with substantially the same film thickness (height).

FIG. 3 is a partially enlarged plan view of the above modification, that is, the spectacle lens 1 of FIGS.

FIG. 4 is a diagram showing an example of a manufacturing process of the above modification, for example, the spectacle lens 1 of FIG. 2(a).
The spectacle lens 1 shown in FIG. 2A can be manufactured, for example, according to the steps shown in FIGS.
First, the low hardness layer 12L is formed on the entire convex surface of the lens substrate 11 (see FIG. 4A).

Next, a protective sheet 20 is attached onto the formed low-hardness layer 12L (see FIG. 4(b)).
Next, the low-hardness layer 12L formed on the lens substrate 11 and the protective sheet 20 thereon are provided with a predetermined pattern by, for example, a laser (see FIG. 4(c)). This pattern shape is the pattern shape of the high hardness layer 12H.

Next, the high hardness layer 12H is formed (see FIG. 4(d)). In the step of FIG. 4(c), the high hardness layer 12H is formed in recesses formed in a predetermined pattern in the low hardness layer 12L and the protective sheet 20 thereon.

Finally, by peeling off the protective sheet 20, the spectacle lens 1 in which both the low hardness layer 12L and the high hardness layer 12H are formed in a pattern on the lens substrate 11 is completed (see FIG. 4(e). ).

5A and 5B are diagrams showing another example of the manufacturing process of the spectacle lens 1 of FIG. 2A.
First, a mask material 21 having a predetermined pattern is formed on the entire convex surface of the lens substrate 11 (see FIG. 5A). This pattern shape is the pattern shape of the high hardness layer 12H.

Next, the low-hardness layer 12L is formed on the entire surface of the lens substrate 11 on which the mask material 21 is formed (see FIG. 5B).

Next, the mask material 21 is peeled off (removed). As a result, a predetermined pattern is formed in the low-hardness layer 12L formed on the lens substrate 11 (see FIG. 5(c)). As described above, this pattern shape is the pattern shape of the high hardness layer 12H.

Next, the high hardness layer 12H is formed (see FIG. 5(d)). In the step of FIG. 5C, the high hardness layer 12H is formed in the concave portion of the low hardness layer 12L having a predetermined pattern.

As described above, the spectacle lens 1 in which both the low-hardness layer 12L and the high-hardness layer 12H are patterned on the lens substrate 11 is completed (see FIG. 5(d)).

In the modification shown in FIGS. 2(a) and 2(b), the hard coat film is thus formed on the lens substrate 11 by the low hardness layer 12L and the high hardness layer 12H, both of which are formed in a pattern. With this structure, cracks in the hard coat film can be prevented even in a high-temperature environment, heat resistance is improved, and excellent scratch resistance is obtained by the high hardness layer 12H. That is, with the spectacle lens 1 according to this modified example as well, it is possible to obtain a spectacle lens that is excellent in both scratch resistance and heat resistance, and that achieves both scratch resistance and heat resistance.

In this modified example, if the pattern area of the low-hardness layer 12L formed in a pattern is small, there is a possibility that the effect of preventing cracks from occurring in the hard coat film may not be sufficiently obtained. The pattern area of 12L is preferably larger than the pattern area of the high hardness layer 12H. On the other hand, if the pattern area of the high hardness layer 12H formed in a pattern is too small, the high hardness layer 12H may not provide sufficient scratch resistance. Therefore, it is desirable that the pattern area of the low-hardness layer 12L is 50% or more and 70% or less in terms of area ratio with respect to the area of the entire surface of the lens substrate 11 .

Further, the pattern shape of the low hardness layer 12L and the pattern shape of the high hardness layer 12H may be the same pattern shape or different pattern shapes.

[Second embodiment]
Both (a) and (b) of FIG. 8 are sectional views of a spectacle lens according to a second embodiment of the present invention.
The spectacle lens 10 of the present embodiment has a hard coat film for protecting the lens surface from scratches and the like and an antireflection film for preventing light reflection on the lens surface on a spectacle lens substrate. is.

First, specifically referring to FIG. 8A, the spectacle lens 10 of the present embodiment has a hard coat film 12 on the convex surface of the lens substrate 11 having a convex surface on the object side, An antireflection film 13 including two types of layers having different physical properties is provided thereon. In the present embodiment, the antireflection film 13 is formed by patterning the second layer on the first layer formed on the entire surface of the hard coat film 12 . The first layer is the low hardness layer 13L, and the second layer is the high hardness layer 13H. That is, in the present embodiment, the antireflection film 13 including two types of layers with different hardness is provided on the lens substrate 11, and the low hardness layer 13L formed on the entire surface of the hard coat film 12 is A high hardness layer 13H is formed thereon in a pattern. Examples of the pattern of the high-hardness layer 13H include a lattice mesh pattern as shown in FIG. 6 and a dot-shaped pattern as shown in FIG. 7, but the present invention is limited to these patterns. not something to do. Both the low hardness layer 13L and the high hardness layer 13H are alternately laminated films of the low refractive index layers 13a and the high refractive index layers 13b.
The materials and the like of the lens substrate 11 and the hard coat film 12 are the same as those of the first embodiment, and thus the description is omitted here.

<Anti-reflection film>
The antireflection film 13 is a film that normally has a multi-layer structure in which layers with different refractive indices are laminated, and prevents reflection of light by an interference effect. Examples _of materials for the antireflection film 13 include _SiO2 , SiO, _ZrO2 , _TiO2 , _TiO , _{Ti2O3 , Ti2O5 , Nb2O5, Al2O3, Ta2O5 , and CeO . 2} , MgO, Y ₂ O ₃ , SnO ₂ , MgF ₂ and WO ₃ , and these can be used alone or in combination of two or more. An example of such an antireflection film 13 is a multi-layer structure in which a low refractive index layer 13a and a high refractive index layer 13b are laminated in multiple layers. The refractive index of the low refractive index layer 13a is, for example, 1.35 to 1.80 at a wavelength of 500 to 550 nm. The refractive index of the high refractive index layer 13b is, for example, 1.90 to 2.60 at a wavelength of 500 to 550 nm.

The low refractive index layer 13a is made of, for example, silicon dioxide (SiO ₂ ) with a refractive index of about 1.43 to 1.47, and the high refractive index layer 13b has a higher refractive index than the low refractive index layer 13a. _metal oxides such as niobium oxide ( _Nb2O5 ), tantalum oxide ( _TiO2 ) _, zirconium oxide ( _ZrO2 ), yttrium oxide ( _Y2O3 ), aluminum oxide _{( Al2O3} ), etc. It is constructed by using substances in an appropriate ratio.

In the present embodiment, as described above, the antireflection film 13 includes the low-hardness layer 13L composed of a plurality of layers formed on the entire surface of the hard coat film 12, and the plurality of layers formed in a pattern thereon. Regarding the materials of the low hardness layer 13L and the high hardness layer 13H, it is necessary to consider the refractive index within the range in which the antireflection film can be established.

When the material of the antireflection film 13 is an inorganic substance such as a metal oxide as described above, the film formation method includes, for example, vacuum deposition, ion plating, sputtering, CVD, and chemical vapor deposition in a saturated solution. A method of depositing by a reaction or the like can be adopted.

As described above, in the present embodiment, the antireflection film 13 includes two types of layers having different hardnesses, the low hardness layer 13L formed on the entire surface of the hard coat film 12, and the patterned antireflection film 13L formed thereon. and a high hardness layer 13H. Note that the above-mentioned “whole surface” does not include the edge surface (edge) of the lens substrate 11 .

The method of forming the high hardness layer 13H in a desired pattern on the low hardness layer 13L is not particularly limited. is preferably used to form the high hardness layer 13H by a vapor deposition method.

Also in the present embodiment, the above-mentioned "hardness" can be evaluated by, for example, indentation hardness (hardness). The indentation hardness is as described above.

From the viewpoint of improving heat resistance, the low-hardness layer 13L preferably has an indentation hardness in the range of 80 to 170 mgf/μm ² . From the viewpoint of scratch resistance, the high hardness layer 13H preferably has an indentation hardness in the range of 170 to 250 mgf/μm ² . The indentation hardness can be adjusted, for example, by changing the material of each layer of the antireflection film, the film thickness of each layer, and the number of layers.

In this embodiment, the antireflection film 13 includes the low hardness layer 13L formed on the entire surface of the hard coat film 12 and the high hardness layer 13H formed thereon in a pattern. By doing so, the heat resistance is improved. Moreover, scratch resistance is obtained by the high hardness layer 13H. That is, the spectacle lens 10 of the present embodiment is excellent in both heat resistance and heat resistance, and can achieve both heat resistance and scratch resistance, which could not be achieved by conventional techniques.

This embodiment can also be modified in the same manner as in the case of the above-described first embodiment. That is, the antireflection film 13 may be configured to include the low hardness layer 13L and the high hardness layer 13H, both of which are formed in a pattern. FIG. 8(b) shows an embodiment corresponding to the modification of the first embodiment shown in FIG. 2(a). In addition, 13 L of low hardness layers in FIG.8(b) consist of multiple layers.

FIG. 8 shows the configuration having the hard coat film 12, but this is an embodiment in which the hard coat film is not provided on the lens substrate 11 and the antireflection film 13 having the configuration of the present invention is formed. may In the case where the hard coat film 12 is provided, the hard coat film 12 may also adopt the configuration according to the first embodiment.

In this embodiment, the case of having two layers with different hardness as the two layers with different physical properties has been described, but the physical properties are not limited to hardness. For example, in the present embodiment, the antireflection film 13 may have a structure including two types of layers having different contact angles. The "contact angle" in this case is the contact angle with respect to the formed surface when only one layer is formed.
According to such an embodiment, it is possible to improve properties such as water repellency and stain resistance of the spectacle lens surface as well as heat resistance.

The various embodiments described above are examples, and the present invention is not limited to these embodiments. For example, an embodiment in which three types of layers having different physical properties are all formed in a pattern can be employed. In short, without being limited to the various embodiments described above, at least one of a hard coat film and an antireflection film is formed on at least one of the object-side surface and the eyeball-side surface of the lens substrate. At least one of the hard coat film and the antireflection film consists of at least two types of layers with different physical properties, or includes at least two types of layers with different physical properties, at least one of which Any embodiment in which the layers are formed in a pattern is included in the present invention.

The spectacle lens 1 of the embodiment described above may have functional layers such as a water-repellent layer and an anti-fogging layer in addition to the hard coat film and the antireflection film described above. Embodiments having such other functional layers are also intended to be included in the present invention.

Further, in the embodiment described above, the case where the "hardness" is evaluated by the indentation hardness has been described, but the present invention is not limited to this. In addition to the above-mentioned indentation hardness, microindentation hardness, Martens hardness (defined in ISO 14577:2000), composite Young's modulus, and the like are also known as indicators of coating film hardness. Therefore, "hardness" may be evaluated by these indices.

As described above, according to the spectacle lens of the present invention, at least one of the hard coat film and the antireflection film is formed on at least one of the object-side surface and the eyeball-side surface of the lens substrate. At least one of the hard coat film and the antireflection film consists of at least two layers with different physical properties, such as hardness and contact angle, or contains at least two layers with different physical properties, Since at least one of the layers is formed in a pattern, it is possible to obtain a spectacle lens that is excellent in both scratch resistance and heat resistance and that has both scratch resistance and heat resistance.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples.
(Example 1)
A hard coat liquid A containing inorganic oxide particles and a silicon compound was applied by spin coating to the entire convex surface of an eyeglass lens substrate manufactured from an eyeglass lens monomer (manufactured by Mitsui Chemicals, Inc., trade name "MR8"). , 100° C. for 60 minutes to form a hard coat layer A having a thickness of 3 μm.

Subsequently, on the hard coat layer A, a hard coat liquid B containing inorganic oxide particles and a silicon compound is applied by an inkjet recording method and cured by heating at 100° C. for 60 minutes to form a hard coat layer having a thickness of 3 μm. B was formed in a pattern. The hard coat layer B was formed in a grid pattern of 400 μm in length and width.

In this example, the hard coat layer A formed on the entire surface of the lens substrate is a low-hardness layer having an indentation hardness of 80 mgf/μm ² , and is formed in a pattern on the hard coat layer A. The hard coat layer B thus formed is a high-hardness layer having an indentation hardness of 150 mgf/μm ² .
The spectacle lens of Example 1 was produced as described above.

(Comparative example 1)
A hard coating liquid containing inorganic oxide particles and a silicon compound is applied by spin coating to the entire convex surface of an eyeglass lens substrate manufactured from an eyeglass lens monomer (manufactured by Mitsui Chemicals, Inc., trade name "MR8"), A single-layer hard coat layer having a thickness of 3 μm was formed by heat curing at 100° C. for 60 minutes.

In this comparative example, the hard coat layer formed on the entire surface of the lens substrate is a high-hardness layer having an indentation hardness of 120 mgf/μm ² .
A spectacle lens of Comparative Example 1 was produced as described above.

The spectacle lenses of Example 1 and Comparative Example 1 obtained as described above were subjected to the following scratch resistance test and heat resistance test.
[Scratch resistance test]
Steel wool (standard #0000, manufactured by Japan Steel Wool Co., Ltd.) was rubbed against the surface of the spectacle lens while pressing it at 1 kgf/cm ² , and the resistance to scratching was visually determined. Judgment criteria were as follows.
UA: Almost no scratches.
A: Several thin scratches, or about two deep but fine scratches.
B: About 20 thin scratches, or about 10 fine but deep scratches.
C: Many deep (regardless of thickness) scratches are generated and almost cloudy, or shallow scratches but no coat (weak film).

[Heat resistance test]
The spectacle lens was placed in a heating furnace, and the temperature inside the furnace was increased stepwise from 50°C to 100°C. The presence or absence of cracks in the hard coat layer was visually checked, and the temperature at which cracks occurred was defined as the heat resistant temperature.

[Evaluation results]
Both the spectacle lenses of Example 1 and Comparative Example 1 were evaluated as "UA" in the scratch resistance test. However, in the heat resistance test, the heat resistance temperature of the spectacle lens of Example 1 was 60° C., which was improved by 10° C. or more compared to the spectacle lens of Comparative Example 1 (conventional example). That is, according to the examples of the present invention, it is possible to obtain a spectacle lens that achieves both scratch resistance and heat resistance. On the other hand, in the comparative example (conventional example), heat resistance cannot be obtained when sufficient scratch resistance is to be obtained, and it is difficult to achieve both scratch resistance and heat resistance.

(Example 2)
A hard coating liquid containing inorganic oxide particles and a silicon compound is applied by spin coating to the entire convex surface of an eyeglass lens substrate manufactured from an eyeglass lens monomer (manufactured by Mitsui Chemicals, Inc., trade name "MR8"), A single-layer hard coat layer having a thickness of 3 μm was formed by heat curing at 100° C. for 60 minutes.

Next, the spectacle lens having the hard coat layer formed thereon is placed in a vapor deposition apparatus, and an antireflection layer A in which SiO ₂ —Cr—SiO ₂ layers are alternately laminated is formed on the entire surface of the hard coat layer by a vacuum vapor deposition method. formed.

Subsequently, on the antireflection layer A, an antireflection layer B, in which SiO ₂ layers and ZrO ₂ layers were alternately laminated, was formed in a pattern by vacuum deposition. The antireflection layer B was formed in a lattice mesh pattern of 400 μm in length and width by vapor deposition with a mask member having a lattice mesh interposed therebetween.

In this embodiment, the antireflection layer A formed on the entire surface of the hard coat layer is a low-hardness layer having an indentation hardness of 100 mgf/μm ² and is formed in a pattern on the antireflection layer A. The above antireflection layer B is a high-hardness layer having an indentation hardness of 190 mgf/μm ² .
As described above, an antireflection layer consisting of two types of layers: a hard coat layer, an antireflection layer A formed on the entire surface, and an antireflection layer B formed in a pattern thereon was formed on the lens substrate. A spectacle lens of Example 2 was produced.

(Comparative example 2)
In the same manner as in Example 2, a spectacle lens having a hard coat layer formed on a lens substrate is placed in a vapor deposition apparatus, and a SiO ₂ layer and a ZrO ₂ layer are formed on the entire surface of the hard coat layer by vacuum vapor deposition. An antireflection layer was formed by alternately laminating eight layers.
A spectacle lens of Comparative Example 2 was produced as described above.

The same scratch resistance test and heat resistance test as in Example 1 were performed on the spectacle lenses of Example 2 and Comparative Example 2 obtained as described above.

[Evaluation results]
Both the spectacle lenses of Example 2 and Comparative Example 2 were evaluated as "UA" in the scratch resistance test. However, in the heat resistance test, the heat resistance temperature of the spectacle lens of Example 2 was 60°C, which was improved by 10°C or more compared to the spectacle lens of Comparative Example 2 (conventional example).

1, 10 spectacle lens 11 lens substrate 12 hard coat film 12H high hardness layer 12L low hardness layer 13 antireflection film 13H high hardness layer 13L low hardness layer 13a low refractive index layer 13b high refractive index layer 20 protective sheet 21 mask material

Claims (8)

A spectacle lens having at least one of a hard coat film and an antireflection film on at least one of an object-side surface and an eyeball-side surface of a lens substrate,
At least one of the hard coat film and the antireflection film is composed of at least two layers with different physical properties, or includes at least two layers with different physical properties, at least one of which is patterned. A spectacle lens characterized by being formed. 2. The spectacle lens according to claim 1, wherein said physical property is hardness. 2. The spectacle lens according to claim 1, wherein the physical property is a contact angle. At least one of the hard coat film and the antireflection film comprises a first layer and a second layer having different physical properties, or includes a first layer and a second layer having different physical properties, and 4. The spectacle lens according to claim 1, wherein the second layer is formed in a pattern on the first layer formed on the entire surface of the lens substrate. 5. The spectacle lens according to claim 4, wherein the first layer is a low hardness layer and the second layer is a high hardness layer. At least one of the hard coat film and the antireflection film comprises a first layer and a second layer having different physical properties, or includes a first layer and a second layer having different physical properties, 4. The spectacle lens according to claim 1, wherein both the first layer and the second layer are patterned. The pattern area of the first layer is larger than the pattern area of the second layer, the first layer is a low hardness layer, and the second layer is a high hardness layer. The spectacle lens according to claim 6. 8. The spectacle lens according to claim 1, wherein said pattern is mesh or dot.

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