Optical article

Abstract

The purpose of the present disclosure is to provide an optical article capable of suppressing the occurrence of ghosts during use. An optical article according to the present disclosure has a first anti-reflection film, a lens base material, and a second anti-reflection film in this order. In the reflection spectrum of the first anti-reflection film, there is a wavelength X1 exhibiting a minimum value in a wavelength range of 400-510 nm, there is a wavelength X2 exhibiting a minimum value in a wavelength range of 580-730 nm, and there is a wavelength X3 exhibiting a maximum value between the wavelength X1 and the wavelength X2. In the reflection spectrum of the second anti-reflection film, there is a wavelength Y1 exhibiting a minimum value in a wavelength range of 400-510 nm, there is a wavelength Y2 exhibiting a minimum value in a wavelength range of 580-730 nm, and there is a wavelength Y3 exhibiting a maximum value between the wavelength Y1 and the wavelength Y2.　At least one of requirement 1 or requirement 2 below is satisfied.　Requirement 1: one among the difference between the wavelength X3 and the wavelength Y1 or the difference between the wavelength X3 and the wavelength Y2 is 15 nm or less. Requirement 2: one among the difference between the wavelength Y3 and the wavelength X1 or the difference between the wavelength Y3 and the wavelength X2 is 15 nm or less.

Description

optical articles

[0001] This disclosure relates to optical articles.

[0002] One example of an optical article is the spectacle lens used in eyeglasses. Various studies have been conducted on spectacle lenses. Because reflections tend to occur at the air interface of spectacle lenses, an anti-reflective coating is sometimes provided. For example, Patent Document 1 below discloses an embodiment in which an anti-reflective coating having a low refractive index layer and a high refractive index layer is formed on both sides of a plastic spectacle lens.

[0003] Japanese Patent Publication No. 2002-350603

[0004] This disclosure relates to an optical article comprising a first anti-reflective coating, a lens substrate, and a second anti-reflective coating in that order, wherein when the reflection spectrum of the first anti-reflective coating is measured, there is a wavelength X1 that shows a minimum value RX1 in the range of 400 to 510 nm, a wavelength X2 that shows a minimum value RX2 in the range of 580 to 730 nm, and a wavelength X3 that shows a maximum value RX3 in the range between wavelength X1 and wavelength X2, and when the reflection spectrum of the second anti-reflective coating is measured, there is a wavelength Y1 that shows a minimum value RY1 in the range of 400 to 510 nm, a wavelength Y2 that shows a minimum value RY2 in the range of 580 to 730 nm, and a wavelength Y3 that shows a maximum value RY3 in the range between wavelength Y1 and wavelength Y2, and satisfies either requirement 1 or requirement 2 below. Requirements 1 and requirements 2 are as follows. Requirement 1: Either the difference between wavelength X3 and wavelength Y1, or the difference between wavelength X3 and wavelength Y2, is 15 nm or less. Requirement 2: Either the difference between wavelength Y3 and wavelength X1, or the difference between wavelength Y3 and wavelength X2, is 15 nm or less.

[0005] This is a schematic cross-sectional view showing an example of an optical article (spectaclephone lens) of the present disclosure. This is a graph showing an example of the reflection spectrum of an anti-reflective coating. This is a graph showing the reflection spectra of anti-reflective coating 1 and anti-reflective coating 2 used in the example superimposed. This is a graph showing the reflection spectra of anti-reflective coating 2 and anti-reflective coating 3 used in the example superimposed. This is a graph showing the reflection spectra of anti-reflective coating 1 and anti-reflective coating 3 used in the comparative example superimposed.

[0006] The optical articles of this disclosure are described in detail below. In optical articles, it is required to suppress the occurrence of ghosting during use. The optical articles of this disclosure can suppress the occurrence of ghosting during use. Ghosting is an image produced by light rays that have been transmitted through the air interface on the incident surface side of the optical article (hereinafter also referred to as the "incident interface"), reflected by the air interface on the opposite side of the optical article (hereinafter also referred to as the "exit interface"), and then reflected again by the light reflected at the incident interface. Ghosting is likely to occur when light rays are incident from a direction inclined with respect to the normal direction of the incident interface of the optical article. In this disclosure, "~" is used to mean that the values ​​described before and after it are included as the lower and upper limits. In this disclosure, the refractive index is the refractive index at the e-line unless otherwise specified.

[0007] <Optical Articles> The optical articles of this disclosure have a first anti-reflective coating, a lens substrate, and a second anti-reflective coating in this order. Figure 1 shows a schematic cross-sectional view of an eyeglass lens, which is an example of an embodiment of the optical articles of this disclosure. In the eyeglass lens 10 shown in Figure 1, the first anti-reflective coating 14 is provided on one surface of the eyeglass lens substrate 12, and the second anti-reflective coating 16 is provided on the other surface of the eyeglass lens substrate 12. The eyeglass lens 10 has the first anti-reflective coating 14, the eyeglass lens substrate 12, and the second anti-reflective coating 16 in this order, and does not have any other components, but may have components described later. Furthermore, the optical articles of this disclosure are not limited to eyeglass lenses, and various lens substrates may be used.

[0008] The configurations of the optical articles of this disclosure and configurations that the optical articles of this disclosure may have are described below.

[0009] [Lens Substrate] The optical article of this disclosure has a lens substrate. The lens substrate of this disclosure is a member that supports the first anti-reflective coating and the second anti-reflective coating. The type of lens substrate of the optical article of this disclosure is not particularly limited and can be any lens substrate used for various optical applications, but spectacle lens substrates are preferred. An example in which the lens substrate is a spectacle lens substrate will be described below, but this disclosure is not limited to the following embodiments and various lens substrates can be used.

[0010] The type of spectacle lens substrate is not particularly limited, and ordinary spectacle lens substrates made of plastic, inorganic glass, etc. are examples, but plastic spectacle lens substrates are preferred due to their excellent handling properties. The type of plastic spectacle lens substrate is not particularly limited, but examples include finished lenses in which both the convex and concave surfaces are optically finished and molded to the desired power, semi-finished lenses in which only the convex surface is finished as an optical surface (spherical, rotationally symmetric aspherical, progressive surface, etc.), and lenses in which the concave surface of a semi-finished lens is processed and polished according to the wearer's prescription. The type of plastic (so-called resin) contained in the plastic spectacle lens substrate is not particularly limited, but examples include (meth)acrylic acid ester resin, thiourethane resin, allyl resin, episulfide resin, polycarbonate, urethane resin, polyester, polystyrene, polyethylenesulfone, poly-methylpentene-1, and diethylene glycol bisallyl carbonate resin (CR-39). Among these, thiourethane resin, episulfide resin, and diethylene glycol bisallyl carbonate resin are preferably used. The thiourethane resin is obtained from a polyisocyanate compound and a polythiol compound. It is preferable to use at least one of the following polyisocyanate compounds: m-xylylene diisocyanate, a mixture of 2,5-bis(isocyanatomethyl)-bicyclo[2,2,1]heptane and 2,6-bis(isocyanatomethyl)-bicyclo[2,2,1]-heptane, isophorone diisocyanate, hexamethylene diisocyanate, and tolylene diisocyanate. It is preferable to use at least one selected from pentaerythritol tetrakis(3-mercaptopropionate), 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, and a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane as the polythiol compound.Episulfide resins are obtained by ring-opening polymerization of monomers having an episulfide group (also called an epithio group), or mixed monomers containing this monomer. It is preferable to use at least one monomer selected from bis(2,3-epithiopropyl)sulfide and bis(2,3-epithiopropyl)disulfide as the monomer having an episulfide group.

[0011] The thickness of the plastic spectacle lens substrate is not particularly limited, but for ease of handling, it is often around 1 to 30 mm. The refractive index of the plastic spectacle lens substrate is not particularly limited, but it is often 1.50 or higher, preferably 1.60 to 1.80, and more preferably 1.60 to 1.74.

[0012] Furthermore, the spectacle lens substrate does not have to be colorless as long as it is light-transmitting, and may contain ultraviolet absorbers and dyes that absorb specific wavelengths from the ultraviolet to infrared regions. In addition, the spectacle lens substrate may contain additives such as bluing agents, light stabilizers, and antioxidants.

[0013] [First Anti-Reflection Coating] The optical article of this disclosure has a first anti-reflection coating. Here, when the reflection spectrum of the first anti-reflection coating is measured, there is a wavelength X1 that shows a minimum value RX1 in the range of 400 to 510 nm, a wavelength X2 that shows a minimum value RX2 in the range of 580 to 730 nm, and a wavelength X3 that shows a maximum value RX3 in the range between wavelength X1 and wavelength X2. In this disclosure, the first anti-reflection coating satisfies either requirement 1 or requirement 2 described above with respect to wavelengths X1, X2 and X3, and the minimum values ​​RX1, RX2 and RX3. In this disclosure, the reflection spectrum refers to the wavelength dependence of the reflectance. The wavelengths X1, X2 and X3, and the minimum values ​​RX1, RX2 and RX3 will be described with reference to the drawings.

[0014] Figure 2 is a graph showing an example of the reflection spectrum of the first anti-reflective coating. In the graph shown in Figure 2, the horizontal axis represents wavelength (unit: nm), and the vertical axis represents reflectance (unit: %). In the graph shown in Figure 2, the solid line shows an example of the reflection spectrum. In Figure 2, the dashed lines represent the positions of 400 nm, 510 nm, 580 nm, and 730 nm, respectively, from left to right on the page. In the reflection spectrum shown in Figure 2, it can be seen that there is a wavelength X1 showing a minimum value RX1 in the range of 400 to 510 nm, and a wavelength X2 showing a minimum value RX2 in the range of 580 to 730 nm. It can also be seen that there is a wavelength X3 showing a maximum value RX3 in the range between wavelength X1 and wavelength X2. Therefore, the reflection spectrum shown in Figure 1 has the above wavelengths X1, X2, and X3, as well as the above minimum values ​​RX1, RX2, and RX3.

[0015] Furthermore, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 400 to 510 nm, wavelength X1 is selected as the wavelength exhibiting the smallest minimum value among the multiple wavelengths. That is, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 400 to 510 nm, the minimum value RX1 is selected as the smallest value among the multiple wavelengths. Similarly, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 580 to 730 nm, wavelength X2 is selected as the wavelength exhibiting the smallest minimum value among the multiple wavelengths. That is, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 580 to 730 nm, the minimum value RX2 is selected as the smallest value among the multiple wavelengths.

[0016] The reflection spectrum of the first anti-reflective coating is measured by incident light rays from the first anti-reflective coating side of the lens substrate. In this disclosure, the reflection spectrum of the first anti-reflective coating refers to the spectrum measured by incident light rays from a direction 15° to the normal direction of the first anti-reflective coating. For example, the reflection spectrum of the first anti-reflective coating can be measured by a spectroscopic analyzer in a manner that is free from the influence of reflection from the opposite side (second anti-reflective coating side) of the lens substrate in an optical article. For example, the reflection spectrum of the first anti-reflective coating can be measured without being affected by reflection from the second anti-reflective coating side if measured at a point 15 mm inward from the outer edge of a lens substrate with a diopter of -2.00 to -4.00. Alternatively, the reflection spectrum of the first anti-reflective coating may be obtained by simulation. When obtaining the reflection spectrum of the first anti-reflective coating by simulation, the reflection spectrum at the interface between the first anti-reflective coating and a component adjacent to the first anti-reflective coating is obtained by simulation. When performing the above simulation, a light ray is incident from a direction 15° to the normal direction of the surface of the first anti-reflective coating.

[0017] The above wavelength X1 is preferably 405 nm or more, more preferably 410 nm or more, and even more preferably 415 nm or more. The above wavelength X1 is preferably 460 nm or less, more preferably 450 nm or less, even more preferably 440 nm or less, and particularly preferably 430 nm or less. The above wavelength X2 is preferably 585 nm or more, more preferably 590 nm or more. The above wavelength X2 is preferably 630 nm or less, more preferably 620 nm or less, even more preferably 610 nm or less, and particularly preferably 600 nm or less.

[0018] The above wavelength X3 is greater than or equal to the above wavelength X1, preferably 450 nm or greater, more preferably 460 nm or greater, even more preferably 470 nm or greater, and particularly preferably 480 nm or greater. The above wavelength X3 is less than or equal to the above wavelength X2, preferably 540 nm or less, more preferably 530 nm or less, even more preferably 520 nm or less, and particularly preferably 510 nm or less.

[0019] The above minimum value RX1 is preferably 0.70% or less, more preferably 0.50% or less, and even more preferably 0.40% or less. The minimum value RX1 may be 0.00%, and is often 0.01% or more. The above minimum value RX2 is preferably 0.70% or less, more preferably 0.50% or less, and even more preferably 0.40% or less. The minimum value RX2 may be 0.00%, and is often 0.01% or more.

[0020] The above maximum value RX3 is preferably 2.00% or less, more preferably 1.50% or less, and even more preferably 1.20% or less. The above maximum value RX3 is often greater than 0.70%, may be 0.80% or more, and may be 0.90% or more.

[0021] The first anti-reflective film has the above wavelengths X1, X2, and X3, as well as the above minimum values ​​RX1, RX2, and RX3, and is not particularly limited as long as it satisfies either requirement 1 or requirement 2 described above. The first anti-reflective film may be a single-layer structure or a multilayer structure. In the case of a multilayer structure, a structure in which low refractive index layers and high refractive index layers are alternately stacked is preferred. An inorganic anti-reflective film is preferred as the first anti-reflective film. An inorganic anti-reflective film is an anti-reflective film composed of an inorganic compound.

[0022] The high refractive index layer described above is preferably a layer with a refractive index of 1.60 or higher. The high refractive index layer preferably contains at least one oxide selected from the group consisting of titanium, zirconium, aluminum, niobium, tantalum, and lanthanum. In particular, the high refractive index layer is made of zirconium dioxide (ZrO2). ２ It is preferable that the high refractive index layer contains two or more materials.

[0023] The low refractive index layer is preferably a layer with a refractive index of less than 1.60. The low refractive index layer preferably contains at least one selected from the group consisting of silicon oxide, calcium fluoride, and magnesium fluoride. In particular, the low refractive index layer is silicon dioxide (SiO₂ ２ It is preferable that it contains ). The low refractive index layer may contain two or more materials.

[0024] In the first anti-reflective coating, the total number of high-refractive-index layers and low-refractive-index layers is preferably two or more, and more preferably four or more. Furthermore, the total number of layers is often 16 or less, and preferably 12 or less.

[0025] In the first anti-reflective coating, the layer positioned closest to the lens substrate may be a low refractive index layer or a high refractive index layer.

[0026] The thickness of the high refractive index layer is preferably 10 to 250 nm, more preferably 20 to 200 nm, and even more preferably 30 to 180 nm. The thickness of the low refractive index layer is preferably 5 to 200 nm, more preferably 6 to 150 nm, and even more preferably 8 to 100 nm.

[0027] The method for manufacturing the first anti-reflective coating is not particularly limited, but examples include vacuum deposition, sputtering, ion plating, ion beam assist, and dry methods such as CVD.

[0028] The first anti-reflective coating, in addition to the high refractive index layer and low refractive index layer described above, contains SnO ２ It may further include a layer or an ITO layer. SnO ２ The layer and the ITO layer can function as antistatic layers. SnO in the first anti-reflective film ２ The placement of the layers and the ITO layer is not particularly limited and may be between the high-refractive-index layer and the low-refractive-index layer as described above.

[0029] [Second Anti-Reflection Coating] The optical article of this disclosure has a second anti-reflection coating. Here, when the reflection spectrum of the second anti-reflection coating is measured, there is a wavelength Y1 that shows a minimum value RY1 in the wavelength range of 400 to 510 nm, a wavelength Y2 that shows a minimum value RY2 in the wavelength range of 580 to 730 nm, and a wavelength Y3 that shows a maximum value RY3 in the range between wavelength Y1 and wavelength Y2. In this disclosure, the second anti-reflection coating satisfies either requirement 1 or requirement 2 above with respect to wavelengths Y1, Y2 and Y3, and the minimum value RY1, minimum value RY2 and maximum value RY3. In this disclosure, the reflection spectrum refers to the wavelength dependence of the reflectance. The wavelengths Y1, Y2, and Y3, as well as the minimum values ​​RY1, RY2, and RY3, can be determined in the same way as the wavelengths X1, X2, and X3, and the minimum values ​​RX1, RX2, and RX3.

[0030] Furthermore, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 400 to 510 nm, wavelength Y1 is selected as the wavelength of the minimum value exhibiting the smallest value among the multiple wavelengths. That is, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 400 to 510 nm, the minimum value RY1 is selected as the smallest value among the multiple wavelengths. Similarly, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 580 to 730 nm, wavelength Y2 is selected as the wavelength of the minimum value exhibiting the smallest value among the multiple wavelengths. That is, if there are multiple wavelengths exhibiting a minimum value in the wavelength range of 580 to 730 nm, the minimum value RY2 is selected as the smallest value among the multiple wavelengths.

[0031] The above wavelength Y1 is preferably 460 nm or more, more preferably 470 nm or more, even more preferably 480 nm or more, and particularly preferably 490 nm or more. The above wavelength Y1 is preferably 505 nm or less. The above wavelength Y2 is preferably 670 nm or more, more preferably 680 nm or more, even more preferably 690 nm or more, and particularly preferably 700 nm or more. The above wavelength Y2 is preferably 725 nm or less, more preferably 720 nm or less, and even more preferably 715 nm or less.

[0032] The above wavelength Y3 is not less than the above wavelength Y1, preferably not less than 560 nm, more preferably not less than 570 nm, still more preferably not less than 580 nm, and particularly preferably not less than 590 nm. The above wavelength Y3 is not more than the above wavelength Y2, preferably not more than 640 nm, more preferably not more than 630 nm, still more preferably not more than 620 nm, and particularly preferably not more than 610 nm.

[0033] The above minimum value RY1 is preferably not more than 0.70%, more preferably not more than 0.50%, and still more preferably not more than 0.40%. The minimum value RY1 may be 0.00%, and in many cases it is not less than 0.01%. The above minimum value RY2 is preferably not more than 0.70%, more preferably not more than 0.50%, and still more preferably not more than 0.40%. The minimum value RY2 may be 0.00%, and in many cases it is not less than 0.01%.

[0034] The above maximum value RY3 is preferably not more than 2.00%, more preferably not more than 1.50%, and still more preferably not more than 1.20%. The above maximum value RY3 is often more than 0.70%, and may be not less than 0.80% or not less than 0.90%.

[0035] The second antireflection film has the above wavelength Y1, wavelength Y2 and wavelength Y3, and the above minimum value RY1, minimum value RY2 and maximum value RY3, and is not particularly limited as long as it satisfies either one of the above-mentioned requirement 1 and requirement 2. Examples of the mode of the second antireflection film and preferred modes are the same as those of the first antireflection film, and thus the description is omitted.

[0036] As described above, the optical article of the present disclosure satisfies either one of the following requirement 1 and requirement 2. Requirement 1: Either one of the difference between the above wavelength X3 and the above wavelength Y1 and the difference between the above wavelength X3 and the above wavelength Y2 is not more than 15 nm. Requirement 2: Either one of the difference between the above wavelength Y3 and the above wavelength X1 and the difference between the above wavelength Y3 and the above wavelength X2 is not more than 15 nm.

[0037] In the optical article of the present disclosure, it is also preferable to satisfy both the above requirement 1 and the above requirement 2.

[0038] In the optical article of the present disclosure, when satisfying Requirement 1, it is preferable that both the minimum value RY1 and the minimum value RY2 are each 0.50% or less. Further, when satisfying Requirement 2, it is preferable that both the minimum value RX1 and the minimum value RX2 are each 0.50% or less, and more preferably each 0.40% or less.

[0039] In addition, it is preferable that both the maximum value RX3 and the maximum value RY3 are each 1.50% or less, and more preferably each 1.20% or less. Also, it is preferable that both the maximum value RX3 and the maximum value RY3 are each in the range of 460 to 630 nm.

[0040] [Primer layer] The optical article (more preferably, spectacle lens) of the present disclosure may have a primer layer. The primer layer is preferably disposed between the lens substrate and the hard coat layer described later. When the primer layer is disposed between the lens substrate and the hard coat layer, the adhesion of the hard coat layer to the lens substrate is improved, and the strength of the optical article having an antireflection film disposed on the hard coat layer against static load or impact is improved.

[0041] The material constituting the primer layer is not particularly limited, and known materials can be used. For example, mainly resins are used. The type of resin used is not particularly limited, and examples include polyurethane resins, epoxy resins, phenolic resins, polyimide resins, polyester resins, bismaleimide resins, and polyolefin resins, with polyurethane resins being preferred. The primer layer may contain other components in addition to the above resins. Examples of other components include oxide fine particles of at least one metal selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti, or composite oxide fine particles thereof, hydrolyzable silicon compounds and / or their hydrolysis condensates, conductive fillers, and surfactants.

[0042] The method for forming the primer layer is not particularly limited, and known methods can be employed. For example, a method can be used in which a primer layer-forming composition containing a predetermined resin is applied to a lens substrate, and a curing treatment is performed as necessary to form the primer layer. The method for applying the primer layer-forming composition is not particularly limited, and an example is the method described later, which involves applying a hard coat layer-forming composition to a lens substrate. The thickness of the primer layer is not particularly limited, but 0.3 to 2 μm is preferred.

[0043] [Hard Coat Layer] The optical articles of this disclosure (more preferably spectacle lenses) may have a hard coat layer. The hard coat layer is preferably disposed between the lens substrate and the first anti-reflective coating, and between the lens substrate and the second anti-reflective coating, and is a layer that provides scratch resistance to the lens substrate. The hard coat layer is preferably one that exhibits a hardness of "H" or higher in pencil hardness as defined by the test method specified in the international standard ISO 15184 and the Japanese Industrial Standard JIS K5600 which was created based on this international standard.

[0044] As the hard coat layer, known hard coat layers can be used, such as organic hard coat layers, inorganic hard coat layers, and organic-inorganic hybrid hard coat layers. For example, in the field of eyeglass lenses, organic-inorganic hybrid hard coat layers are commonly used.

[0045] The hard coat layer preferably contains polymers of polymerizable monomers (polymers obtained by polymerizing polymerizable monomers) and / or condensates of hydrolyzable organosilicon compounds. The polymerizable monomers are not particularly limited, but examples include (meth)acrylates having at least one group selected from the group consisting of phosphate groups and sulfonic acid groups, silsesquioxanes having radical polymerizable groups, polyfunctional acrylates, compounds having multiple epoxy groups, and silsesquioxane compounds having oxetanyl groups. (Meth)acrylate means acrylate or methacrylate. The hydrolyzable organosilicon compounds are not particularly limited, but examples include organosilicon compounds having epoxy groups.

[0046] Furthermore, the hard coat layer may contain inorganic components such as metal oxide fine particles. The type of metal oxide fine particles is not particularly limited, and known metal oxide fine particles can be used. Examples of metal oxide fine particles include oxide fine particles of at least one metal selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti. Among these, in terms of ease of handling, metal oxide fine particles containing Si oxide (silicon oxide fine particles), oxide fine particles containing Sn (tin oxide fine particles), oxide fine particles containing Zr (zirconium oxide fine particles), or oxide fine particles containing Ti (titanium oxide fine particles) are preferred. Note that the metal oxide fine particles may contain only one type of metal (metal atom) as exemplified above, or may contain two or more types of metals (metal atoms). Although Si (silicon) is sometimes classified as a metalloid, in this disclosure, Si is included as a metal.

[0047] The hard coat layer is preferably a layer formed using a hard coat layer forming composition containing a polymerizable monomer. In addition to the polymerizable monomer, the hard coat layer forming composition may also contain the above-mentioned metal oxide fine particles, other components, and a solvent. Examples of other components include radical polymerization initiators, cationic polymerization initiators, and curing catalysts. Other components may also include various additives that are added as needed, such as UV absorbers, anti-aging agents, coating modifiers, light stabilizers, antioxidants, color inhibitors, dyes, fillers, and internal release agents. The solvent may be water or an organic solvent. The type of organic solvent is not particularly limited, and examples include alcohol-based solvents, ketone-based solvents, ether-based solvents, ester-based solvents, hydrocarbon-based solvents, halogenated hydrocarbon-based solvents, amide-based solvents, sulfone-based solvents, and sulfoxide-based solvents.

[0048] A method for forming a hard coat layer using a hard coat layer forming composition includes applying the hard coat layer forming composition onto a lens substrate (or onto a primer layer) to form a coating film, and then performing a curing treatment such as light irradiation and heat treatment on the coating film. The curing treatment may involve either light irradiation or heat treatment, or both. If both are performed, they may be performed simultaneously, or one may be performed before the other. After forming the coating film, a drying treatment such as heat treatment may be performed as needed to remove the solvent from the coating film.

[0049] The method for applying the hard coat layer-forming composition is not particularly limited and includes known methods (e.g., dipping coat method, spin coat method, spray coat method, inkjet coat method, and flow coat method). The thickness of the formed coating film is not particularly limited and is appropriately selected to achieve a predetermined hard coat layer thickness.

[0050] The conditions for the light irradiation treatment are not particularly limited, and suitable conditions are selected depending on the type of polymerization initiator used. The type of light used for irradiation is not particularly limited, but examples include ultraviolet light and visible light. Examples of light sources include high-pressure mercury lamps. The cumulative light intensity during irradiation is not particularly limited, but in terms of productivity and curability of the coating film, it should be 100 to 3000 mJ / cm². ２ Preferably, 100 to 2000 mJ / cm² ２ This is more preferable. The heat treatment conditions are not particularly limited, and the optimal conditions are selected depending on the type of polymerization initiator used. The heating temperature is preferably 30 to 120°C, and the heating time is preferably 5 to 360 minutes.

[0051] The thickness of the hard coat layer is not particularly limited, but is preferably 1 μm or more, and more preferably 3 μm or more. The upper limit of the thickness can be, for example, 30 μm or less. The above thickness is the average thickness, and it is measured by measuring the thickness of any five points on the hard coat layer and taking the arithmetic mean of them.

[0052] The hard coat layer may also contain additives such as bluing agents, light stabilizers, and antioxidants.

[0053] [Water- and oil-repellent layer] The optical articles of this disclosure (more preferably spectacle lenses) may include a water- and oil-repellent layer. In particular, it is preferable that the optical article has a water- and oil-repellent layer as its outermost layer. The water- and oil-repellent layer reduces the surface energy of the spectacle lens, improves the function of preventing contamination of the optical article, and improves the slipperiness of the surface of the optical article, thereby improving the abrasion resistance of the optical article.

[0054] The materials constituting the water-repellent and oil-repellent layer are not particularly limited, and examples include fluorine-containing compounds (compounds containing fluorine atoms) and silicon-containing compounds (compounds containing silicon atoms). In particular, the water-repellent and oil-repellent layer preferably contains a fluorine-containing compound, and more preferably contains at least one selected from the group consisting of fluorine-substituted alkyl group-containing organosilicon compounds, their hydrolysates, and their hydrolyzed condensates. The materials constituting the water-repellent and oil-repellent layer may be used individually or in combination of two or more.

[0055] A fluorine-substituted alkyl group-containing organosilicon compound is an organosilicon compound containing an alkyl group in which some or all of the hydrogen atoms are substituted with fluorine atoms, and which has a hydrolyzable group. Here, a hydrolyzable group is a group that is directly bonded to a silicon atom and can proceed with hydrolysis and condensation reactions, and examples include alkoxy groups, halogen atoms, acyloxy groups, alkenyloxy groups, and isocyanate groups. Note that if multiple hydrolyzable groups are directly bonded to a single silicon atom, they may be the same or different.

[0056] A hydrolysate of a fluorine-substituted alkyl group-containing organosilicon compound refers to a compound obtained by hydrolysis of the hydrolyzable groups in the fluorine-substituted alkyl group-containing organosilicon compound. The hydrolysate may be a complete hydrolysate (where all hydrolyzable groups are hydrolyzed) or a partial hydrolysate (where only some hydrolyzable groups are hydrolyzed). In other words, the hydrolysate may be a complete hydrolysate, a partial hydrolysate, or a mixture thereof. A hydrolysis condensate of a fluorine-substituted alkyl group-containing organosilicon compound refers to a compound obtained by hydrolysis of the hydrolyzable groups in the fluorine-substituted alkyl group-containing organosilicon compound and condensing the resulting hydrolysates. The hydrolysis condensate may be a complete hydrolysis condensate (where all hydrolyzable groups are hydrolyzed and all hydrolyzates are condensed) or a partial hydrolysis condensate (where some hydrolyzable groups are hydrolyzed and some hydrolyzates are condensed). In other words, the hydrolysis condensate may be a complete hydrolysis condensate, a partial hydrolysis condensate, or a mixture thereof.

[0057] The method for forming the water-repellent and oil-repellent layer is not particularly limited and can be arbitrarily selected depending on the materials used, desired performance, or thickness. For example, a method can be described as applying a water-repellent and oil-repellent layer-forming composition containing a fluorine-substituted alkyl group-containing organosilicon compound onto a lens substrate and performing a curing treatment as necessary, as well as a dry method. Examples of coating methods include dipping coat, roll coat, bar coat, spin coat, spray coat, die coat, and gravure coat. Examples of curing treatments include light irradiation, heat treatment, and water vapor contact treatment. Water vapor contact treatment, for example, is a treatment in which the material is brought into contact with air whose humidity is controlled to 50-90% RH. The above curing treatments may be performed in combination. An example of a dry method is the same as the method for the anti-reflective coating (first anti-reflective coating and second anti-reflective coating) described above.

[0058] The thickness of the water-repellent and oil-repellent layer on an optical article is not particularly limited, but 5 to 35 nm is preferred. If the thickness is within the above range, the optical article will have excellent water-repellent and oil-repellent properties.

[0059] <Applications> The optical articles of this disclosure can be used in various applications depending on the type of lens substrate used. For example, when the lens substrate is an eyeglass lens, the optical articles of this disclosure (eyeglass lenses) are suitably used as lenses for eyeglasses. Examples of eyeglasses include eyeglasses having known eyeglass frames and eyeglass lenses. Examples of eyeglass frames include those having a pair of lens frames into which a right-eye eyeglass lens and a left-eye eyeglass lens are respectively mounted, and temples for resting the eyeglass frame on the wearer's ears. When the eyeglass lenses of this disclosure are used in eyeglasses, ghosting is less likely to occur, and the wearer of the eyeglasses can see objects more clearly.

[0060] The optical articles of this disclosure will be described in more detail below with reference to examples and comparative examples, but this disclosure is not limited in any way by these examples.

[0061] <Simulation> The properties of the optical articles of each embodiment and comparative example were evaluated using software simulation. More specifically, the optical articles of the embodiments and comparative examples shown below were constructed using software (optical thin film design software ThinFilmView (Nary Software), hereinafter also referred to as "TFV"), and the reflectance, etc., at incident angles within a predetermined wavelength range and a predetermined angular range were calculated. The refractive index of air was assumed to be 1.00 for the calculations.

[0062] [Anti-reflective coating configuration] An anti-reflective coating with the configuration shown in the table below was constructed on a TFV. The refractive index shown in the table below is the refractive index at 507 nm. The results shown later were calculated taking into account the effect of wavelength dispersion.

[0063]

[0064] [Calculation of Reflectance] Each of the above anti-reflective films was constructed on a lens substrate, and the reflectance for each wavelength was calculated when light was incident from a direction 15° inclined from the normal direction to the surface of the anti-reflective film, on the side of the anti-reflective film opposite the lens substrate, to obtain the reflection spectrum. The refractive index of the lens substrate at 507 nm was assumed to be 1.65. When constructing each of the above anti-reflective films on the lens substrate, the side labeled "1" was positioned on the lens substrate side. The reflection spectra are shown in Figures 3 to 5. Figure 3 shows the reflection spectrum when anti-reflective film 1 is formed on the lens substrate and the reflection spectrum when anti-reflective film 2 is formed on the lens substrate superimposed. Figure 4 shows the reflection spectrum when anti-reflective film 2 is formed on the lens substrate and the reflection spectrum when anti-reflective film 3 is formed on the lens substrate superimposed. Figure 5 shows the reflection spectrum when anti-reflective film 1 is formed on the lens substrate and the reflection spectrum when anti-reflective film 3 is formed on the lens substrate superimposed. Furthermore, the minimum value (minimum value Z1 in the table) in the wavelength range of 400 to 510 nm obtained from the reflection spectrum, and the wavelength (wavelength Z1 in the table) indicating that minimum value were determined. In addition, the minimum value (minimum value Z2 in the table) in the wavelength range of 580 to 730 nm, and the wavelength (wavelength Z1 in the table) indicating that minimum value were determined. Furthermore, the maximum value Z3 between wavelength Z1 and wavelength Z2, and the wavelength Z3 indicating the maximum value Z3 were determined. The above minimum and maximum values, as well as the respective wavelengths, are shown in the table below.

[0065]

[0066] [Evaluation of Ghost Brightness] The ghost brightness was evaluated when anti-reflective coating 1 and anti-reflective coating 2 were placed on both sides of the lens substrate in the combinations shown in the table below. More specifically, the amount of secondary transmitted light at each wavelength was calculated using the following formula from the reflection spectrum at an incident angle of 15° obtained by the procedure described above.

[0067]

[0068] In the above formula, T ２ (λ) represents the amount of secondary transmitted light at wavelength λ. Note that secondary transmitted light is the light that can generate the ghosting described above.１ (λ) and r ２ (λ) represents the reflectance of the antireflection film 1 and the antireflection film 2 at the wavelength λ, respectively. r １ (λ) and r ２ (λ) respectively corresponds to the reflection spectrum obtained by the above procedure. Next, the amount of secondary transmitted light at each obtained wavelength is taken into TFV, and L is obtained on the "user line" ＊ a ＊ b ＊ L in the color space ＊ (ghost brightness) is calculated. Also, in the same manner as the above procedure, the reflection spectra when the incident angles are 5° and 10° are respectively obtained, the secondary transmitted light at each wavelength is calculated using the following formula, and L ＊ a ＊ b ＊ L in the color space ＊ (ghost brightness) is calculated. The ghost brightness at each incident angle is shown together with the combinations of the first antireflection film and the second antireflection film in the examples and comparative examples. In Table 3, the minimum wavelength difference from the wavelength X3 is the smaller value between the difference between the wavelength X3 and the wavelength Y1 and the difference between the wavelength X3 and the wavelength Y2. In Table 3, the minimum wavelength difference from the wavelength Y3 is the smaller value between the difference between the wavelength Y3 and the wavelength X1 and the difference between the wavelength Y3 and the wavelength X2.

[0069]

[0070] From the results shown in Table 3, it can be said that in Examples 1 and 2 that satisfy the above requirement 1 or requirement 2, the ghost brightness is low and the generation of ghosts is suppressed. On the other hand, in Comparative Examples 1 and 2 that do not satisfy either of the above requirement 1 and requirement 2, the ghost brightness is larger compared to Examples 1 and 2, and it can be said that the generation of ghosts cannot be suppressed.

Claims

1. An optical article comprising a first anti-reflective coating, a lens substrate, and a second anti-reflective coating in this order, wherein when the reflection spectrum of the first anti-reflective coating is measured, there is a wavelength X1 that shows a minimum value RX1 in the range of 400 to 510 nm, a wavelength X2 that shows a minimum value RX2 in the range of 580 to 730 nm, and a wavelength X3 that shows a maximum value RX3 in the range between wavelength X1 and wavelength X2, and when the reflection spectrum of the second anti-reflective coating is measured, there is a wavelength Y1 that shows a minimum value RY1 in the range of 400 to 510 nm, a wavelength Y2 that shows a minimum value RY2 in the range of 580 to 730 nm, and a wavelength Y3 that shows a maximum value RY3 in the range between wavelength Y1 and wavelength Y2, and satisfying either requirement 1 or requirement 2 below. Requirement 1: Either the difference between wavelength X3 and wavelength Y1, or the difference between wavelength X3 and wavelength Y2, is 15 nm or less. Requirement 2: Either the difference between wavelength Y3 and wavelength X1, or the difference between wavelength Y3 and wavelength X2, is 15 nm or less.

2. The optical article according to claim 1, which satisfies both requirement 1 and requirement 2.

3. The optical article according to claim 1 or 2, wherein, if requirement 1 is met, both the minimum value RY1 and the minimum value RY2 are 0.50% or less, and if requirement 2 is met, both the minimum value RX1 and the minimum value RX2 are 0.50% or less.

4. The optical article according to any one of claims 1 to 3, wherein both the maximum value RX3 and the maximum value RY3 are 1.50% or less.

5. The optical article according to any one of claims 1 to 4, wherein both the maximum value RX3 and the maximum value RY3 are in the range of 460 to 630 nm.

6. The optical article according to any one of claims 1 to 5, wherein the lens substrate is an eyeglass lens substrate.

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