Spectacle lens

Abstract

The present disclosure addresses the problem of providing a spectacle lens having high visibility through the spectacle lens even in a dark place. A spectacle lens according to the present disclosure comprising: a base material; and a multilayer reflection layer including at least one high refractive index layer and at least one low refractive index layer, wherein an average value X is 0.770% or less, the average value being obtained by calculating a reflectance at a wavelength of 507 nm by making incident light incident on the spectacle lens while changing the angle formed by a normal to a tangent plane at a point where the incident light intersects the surface of the spectacle lens and the incident light every one degree within a range of 15-60°, and arithmetically averaging the calculated reflectance at each angle.

Description

eyeglass lenses

[0001] The present disclosure relates to eyeglass lenses.

[0002] Various studies have been conducted on spectacle lenses. For example, Patent Document 1 describes a spectacle lens in which low refractive index layers and high refractive index layers are alternately laminated on a substrate as an antireflection film.

[0003] International Publication No. 2021 / 060554

[0004] The present disclosure relates to a spectacle lens including a substrate and a multilayer reflective layer including at least one high refractive index layer and at least one low refractive index layer, wherein the angle between the incident light and a normal to a tangent plane at the point where the incident light intersects with the surface of the spectacle lens is changed in 1° increments within a range of 15 to 60°, the incident light is made to be incident on the spectacle lens, the reflectance at a wavelength of 507 nm is calculated, and the average value X obtained by taking the arithmetic mean of the reflectances calculated at each angle is 0.770% or less.

[0005] 1 is a cross-sectional view of an embodiment of a spectacle lens, and FIG. 2 is a schematic cross-sectional view of a pair of eyeglasses using the spectacle lens of the present disclosure when worn.

[0006] The eyeglass lenses of the present disclosure will be described in detail below. Eyeglass lenses are required to have high visibility through them even in dark places. The eyeglass lenses of the present disclosure have excellent visibility in dark places. In this disclosure, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower and upper limits. In addition, in this disclosure, the refractive index is the refractive index at the e-line unless otherwise specified.

[0007] <Eyeglass Lens> Figure 1 is a cross-sectional view of one embodiment of an eyeglass lens according to the present disclosure. The eyeglass lens 10 shown in Figure 1 includes, in this order, a substrate 12, a primer layer 14, a hard coat layer 16, an anti-reflection film 18, and a water- and oil-repellent layer 20. Although the eyeglass lens 10 includes the primer layer 14, the hard coat layer 16, and the water- and oil-repellent layer 20, the primer layer 14, the hard coat layer 16, and the water- and oil-repellent layer 20 are optional components, and it is sufficient for the eyeglass lens according to the present disclosure to include at least the substrate and the anti-reflection film.

[0008] In the eyeglass lens 10 shown in Fig. 1 , the antireflection coating 18 includes, from the substrate 12 side, a first high-refractive-index layer 22H, a first low-refractive-index layer 22L, a second high-refractive-index layer 24H, a second low-refractive-index layer 24L, a third high-refractive-index layer 26H, a third low-refractive-index layer 26L, a fourth high-refractive-index layer 28H, and a fourth low-refractive-index layer 28L, in this order. In Fig. 1 , the fourth low-refractive-index layer 28L is disposed at the position farthest from the substrate 12 in the antireflection coating 18, but the stacking order of the high-refractive-index layers and the low-refractive-index layers may be changed so that the fourth high-refractive-index layer 28H is disposed at the position farthest from the substrate 12. In Fig. 1 , the antireflection coating 18 includes eight high-refractive-index layers and low-refractive-index layers in total. However, the eyeglass lens of the present disclosure is not limited to this configuration as long as it includes at least one high-refractive-index layer and at least one low-refractive-index layer. The total number of high refractive index layers and low refractive index layers may be at least 2, preferably at least 4, more preferably at least 6, and even more preferably at least 8. There is no particular upper limit on the total number of high refractive index layers and low refractive index layers, but from the viewpoint of productivity, it is preferably at most 14, more preferably at most 12.

[0009] 1, each layer is disposed on only one side of the substrate 12, but the primer layer 14, hard coat layer 16, antireflection coating 18, and water- and oil-repellent layer 20 may be disposed in this order on both sides of the substrate 12. In other words, the spectacle lens may have an antireflection coating on both sides of the substrate. Also, in FIG. 1, the antireflection coating consists only of a low-refractive index layer and a high-refractive index layer, but in the spectacle lens of the present disclosure, the antireflection coating may include layers other than the low-refractive index layer and the high-refractive index layer (for example, an antistatic layer, which will be described later).

[0010] <Characteristics of Spectacle Lenses> [Requirement 1] The spectacle lenses of the present disclosure satisfy the following Requirement 1. Requirement 1: The angle between the incident light and the normal to the tangent plane at the point where the incident light intersects with the surface of the spectacle lens is changed in 1° increments within a range of 15 to 60°, the incident light is made to enter the spectacle lens, the reflectance at a wavelength of 507 nm is calculated, and the average value X obtained by arithmetically averaging the reflectances calculated at each angle is 0.770% or less. In other words, the spectacle lenses of the present disclosure have a low reflectance for light incident from an oblique direction of 15° or more.

[0011] Fig. 2 is a cross-sectional schematic diagram of eyeglasses using the eyeglass lenses of the present disclosure when worn. Note that Fig. 2 omits the eyeglass frame and illustrates only one of the eyeglass lenses included in the eyeglasses. Fig. 2 is also a cross-sectional schematic diagram of a plane perpendicular to the height direction of the eyeglass wearer. In Fig. 2 , incident light L1 is incident on the eyeglass lens 10. The incident light L1 is incident perpendicular to the surface of the eyeglass lens 10 and is parallel to the normal direction to the tangent plane at the point where it intersects with the surface of the eyeglass lens.

[0012] Here, the optical axis of the wearer's eye 30 (shown by a dotted line in FIG. 2 ) coincides with the direction of incidence of the incident light L1. Note that FIG. 2 illustrates only the crystalline lens 32 and retina 34 of the eye 30, and other components of the human eye are omitted. Such incident light L1 passes through the spectacle lens 10, enters the eye 30, and reaches area CA of the retina 34 through the crystalline lens 32. In the retina 34, cone cells are concentrated near the optical axis of the eye 30, and this area is shown as area CA in FIG. 2 . On the other hand, in the retina 34, rod cells are concentrated in an area other than area CA, and this area is shown as area RA in FIG. 2 .

[0013] Cone cells are generally responsible for color vision and vision in bright light, while rod cells are responsible for vision in dark light. Therefore, in dark places, light incident on area CA, such as incident light L1, is difficult to perceive as a light stimulus. On the other hand, incident light L3 incident from an oblique direction relative to the optical axis of eye 30 passes through lens 32 and reaches area RA of retina 34. Incident light L3 from such a direction is sensed in area RA, where many rod cells are present, and is therefore easily perceived as a light stimulus even in dark places.

[0014] As described above, the spectacle lens of the present disclosure has a low reflectance of light incident at an oblique angle of 15° or more at a wavelength of 507 nm, with the average value X being 0.770% or less. That is, in FIG. 2 , the reflectance of light incident at an oblique angle of 15° or more with respect to the normal direction of the surface of the spectacle lens 10, as shown by incident light L2, is low. Note that incident light L2 and incident light L3 are parallel. Rod cells are known to have the highest sensitivity at a wavelength of 507 nm. Therefore, light incident at an oblique angle to the spectacle lens 10 (incident light L3) is less likely to be reflected by the spectacle lens 10 and more likely to be sensed by region RA of the retina 34. Therefore, the spectacle lens of the present disclosure has a high transmittance of light from oblique directions, which increases the amount of light incident on regions containing many rod cells that function in dark places, and is therefore thought to improve visibility through the spectacle lens even in dark places (scotopic visibility).

[0015] The average value X is determined by the method described in the Examples below. Specifically, in a structure having a substrate and an anti-reflection film, the reflectance when light is irradiated from each angle on the side having the anti-reflection film is simulated, and the average value in the above angle range is taken as the average value X. In terms of better visibility in the dark, the average value X is preferably 0.750% or less, more preferably 0.720% or less, and even more preferably 0.710% or less. The average value X is usually more than 0%, and in many cases is 0.100% or more.

[0016] The spectacle lenses of the present disclosure are not particularly limited as long as they satisfy the above-mentioned requirement 1, but in terms of better visibility in the dark, they preferably satisfy one or more requirements selected from the group consisting of requirements 2 to 5 described below, more preferably satisfy two or more requirements, even more preferably satisfy three or more requirements, and particularly preferably satisfy all requirements. Requirements 2 to 5 will be explained below.

[0017] [Requirement 2] In the eyeglass lens of the present disclosure, it is preferable to satisfy the following Requirement 2 in terms of better visibility in the dark. Requirement 2: The angle between the incident light and the normal to the tangent plane at the point where the incident light intersects with the surface of the eyeglass lens is changed in 1° increments within a range of 15 to 48°, the incident light is incident on the eyeglass lens, the reflectance at a wavelength of 507 nm is calculated, and the average value Y obtained by arithmetically averaging the reflectances calculated at each angle is 0.390% or less. The average value Y can be calculated in the same manner as the average value X described above. In terms of better visibility in the dark, the average value Y is preferably 0.300% or less, more preferably 0.250% or less, and even more preferably 0.220% or less. The average value Y is usually more than 0%, and is often 0.100% or more.

[0018] [Requirement 3] In the eyeglass lens of the present disclosure, it is preferable to satisfy the following requirement 3 in terms of better visibility in the dark. Requirement 3: When the angle between the incident light and the normal to the tangent plane at the point where the incident light intersects the surface of the eyeglass lens is changed in 1° increments within a range of 0 to 10°, the incident light is incident on the eyeglass lens, the reflectance at a wavelength of 507 nm is calculated, and the average value Z obtained by arithmetically averaging the reflectances at each calculated angle is defined as average value Y, and the average value Y is smaller than average value Z. The average value Z means the reflectance of light incident approximately parallel to the normal direction of the surface of the eyeglass lens. It is believed that satisfying the above requirement 3 will result in lower reflectance of light incident from an oblique direction and better visibility in the dark. Note that, in terms of better visibility in the dark, it is also preferable to simultaneously satisfy requirement 2 regarding the average value Y and requirement 3 regarding the above average values ​​Z and Y.

[0019] [Requirement 4] In terms of achieving better visibility in the dark, the eyeglass lens of the present disclosure preferably satisfies the following Requirement 4. Requirement 4: The average reflectance is 1.000% (1%) or less in the wavelength range of 410 to 675 nm, measured by setting the angle between the incident light and the normal to the tangent plane at the point where the incident light intersects with the surface of the eyeglass lens at 15° and letting the incident light enter the eyeglass lens. When calculating the average value X, the angle of the incident light is fixed, the wavelength of the incident light is changed, and the average value for each wavelength is calculated. The wavelength is changed in increments of 1 nm.

[0020] [Requirement 5] In the spectacle lens of the present disclosure, it is preferable to adjust the lens to satisfy the following requirement 5 in order to obtain better visibility in the dark. Requirement 5: An index P represented by the formula (1) ｎｉｇｈｔ The value is 86.0% (86%) or more.

[0021]

[0022] In formula (1), T ＡＲ ５０７ (θ) represents the transmittance of the spectacle lens at a wavelength of 507 nm, where θ is the angle between the incident light and the normal to the tangent plane at the point where the incident light intersects with the surface of the spectacle lens. ＡＲ ５０７ (θ) represents the transmittance at a wavelength of 507 nm at θ (unit: °) and is obtained by referring to the method for determining the average value X described above. Specifically, in a structure having a substrate and an anti-reflection film, the transmittance when light is irradiated from each angle on the side having the anti-reflection film is simulated, and the transmittance at each angle is determined. In formula (1), D Ｒ (θ) represents 0 when θ is 0 and 1°, 40 when θ is 2, 3 and 4°, 75 when θ is 5, 6, 7, 8 and 9°, 130 when θ is 10, 11, 12, 13 and 14, 150 when θ is 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24°, 130 when θ is 25, 26, 27, 28 and 29°, and 130 when θ is 30. , 31, 32, 33 and 34° represents 120, when θ is 35, 36, 37, 38 and 39° represents 115, when θ is 40, 41, 42, 43 and 44° represents 110, when θ is 45, 46, 47, 48 and 49° represents 90, when θ is 50, 51, 52, 53, 54, 55, 56, 57, 58 and 59° represents 80, and when θ is 60° represents 75. D Ｒ (θ) corresponds to the density of rod cells present in the region of the retina that can sense light entering the eye at an angle θ with respect to the optical axis of the eye. Note that the optical axis of the eye means the optical axis of the human eye, and mainly corresponds to the optical axis of the eye of the spectacle lens wearer. In formula (1), T Ｓｕｂ ５０７(θ) represents the transmittance of the substrate at a wavelength of 507 nm at θ. Ｓｕｂ ５０７ (θ) is the analysis target for the substrate only, T ＡＲ ５０７ It can be obtained in the same way as for (θ).

[0023] The above formula (1) expresses the degree of reflection caused by an anti-reflection film when light is incident at an angle of 0 to 60 degrees at a wavelength of 507 nm, which is the peak wavelength of sensitivity of rod cells. This angle range includes the angular region where many cone cells exist (the region of the retina where light enters from the front direction) and the angular region where many rod cells exist (the region of the retina where light enters from an oblique direction). Therefore, the index P ｎｉｇｈｔ If the value of is large, the reflectance of light not only from the front direction but also from oblique directions is low, and based on the above-mentioned principle, it is thought that visibility in the dark will be better.

[0024] Index P ｎｉｇｈｔ The value of the index P is preferably 88.0% (88%) or more, and more preferably 90.0% (90%) or more, in terms of better visibility in the dark. ｎｉｇｈｔ The upper limit of the value is 100.0% (100%), and is often 99.0% (99%) or less.

[0025] The following describes the configurations included in the eyeglass lenses of the present disclosure and the configurations that may be included.

[0026] [Substrate] The substrate is a member that supports the anti-reflection film. The type of substrate is not particularly limited, and examples include ordinary substrates composed of plastic, inorganic glass, etc., with plastic substrates being preferred in terms of excellent handleability. The type of plastic (so-called resin) contained in the plastic substrate is not particularly limited, and examples include (meth)acrylic acid ester resins, thiourethane resins, allyl resins, episulfide resins, polycarbonates, urethane resins, polyesters, polystyrene, polyethersulfone, poly-4-methylpentene-1, and diethylene glycol bisallyl carbonate resins (CR-39). Of these, thiourethane resins, episulfide resins, and diethylene glycol bisallyl carbonate resins are preferred.

[0027] The type of plastic substrate is not particularly limited, but examples thereof include embodiments having a convex surface and a concave surface. More specifically, examples include a finished lens in which both the convex surface and the concave surface are optically finished and molded according to a desired power, a semi-finished lens in which only the convex surface is finished as an optical surface (spherical surface, rotationally symmetric aspherical surface, progressive surface, etc.), and a lens in which the concave surface of a semi-finished lens is processed and polished according to a wearer's prescription.

[0028] The thickness of the plastic substrate is not particularly limited, but is often about 1 to 30 mm from the viewpoint of ease of handling. The refractive index of the plastic substrate is not particularly limited, but is often 1.50 or higher, preferably 1.60 to 1.80, and more preferably 1.60 to 1.74. Furthermore, the plastic substrate does not have to be colorless as long as it is translucent, and may contain an ultraviolet absorber and a dye that absorbs light in a specific wavelength range from the ultraviolet to the infrared region. Furthermore, the plastic substrate may contain additives such as a bluing agent, a light stabilizer, and an antioxidant.

[0029] [Primer Layer] The spectacle lens may include a primer layer. The primer layer is preferably disposed between the substrate and the hard coat layer. When a primer layer is disposed between the substrate and the hard coat layer, it improves the adhesion of the hard coat layer to the substrate and improves the static load or impact strength of the spectacle lens having an anti-reflection film disposed on the hard coat layer. The material constituting the primer layer is not particularly limited, and known materials can be used, for example, resins are mainly 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 also contain components other than the resin. Examples of the 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 hydrolyzed condensates, conductive fillers, and surfactants.

[0030] The method for forming the primer layer is not particularly limited, and known methods can be used, such as a method of applying a primer layer-forming composition containing a predetermined resin onto a substrate and, if necessary, performing a curing treatment to form a primer layer. The method for applying the primer layer-forming composition is not particularly limited, and examples thereof include the method exemplified by the method of applying a hard coat layer-forming composition to a substrate, which will be described later. The thickness of the primer layer is not particularly limited, but is preferably 0.3 to 2 μm.

[0031] [Hard Coat Layer] The eyeglass lens may include a hard coat layer. The hard coat layer is preferably disposed between the substrate and the anti-reflection film, and is a layer that imparts scratch resistance to the substrate. The hard coat layer preferably exhibits a pencil hardness of "H" or higher according to the test method defined in International Standard ISO 15184 and Japanese Industrial Standard JIS K5600, which was created based on this international standard.

[0032] As the hard coat layer, a known hard coat layer can be used, for example, an organic hard coat layer, an inorganic hard coat layer, or an organic-inorganic hybrid hard coat layer. For example, in the field of eyeglass lenses, an organic-inorganic hybrid hard coat layer is commonly used.

[0033] The hard coat layer preferably contains a polymer of a polymerizable monomer (a polymer obtained by polymerizing a polymerizable monomer) and / or a condensate of a hydrolyzable organosilicon compound. The polymerizable monomer is not particularly limited, but examples thereof 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. Note that (meth)acrylate refers to acrylate or methacrylate. The hydrolyzable organosilicon compound is not particularly limited, but examples thereof include organosilicon compounds having epoxy groups.

[0034] The hard coat layer may also contain inorganic components such as metal oxide fine particles. The type of metal oxide fine particles is not particularly limited, and examples include known metal oxide fine particles. Examples of metal oxide fine particles include fine particles of at least one metal oxide 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 are preferably fine particles of oxides containing Si (silicon oxide fine particles), oxides containing Sn (tin oxide fine particles), oxides containing Zr (zirconium oxide fine particles), or oxides containing Ti (titanium oxide fine particles). The metal oxide fine particles may contain only one of the above-mentioned metals (metal atoms) or two or more metals (metal atoms). Although Si (silicon) is sometimes classified as a semimetal, in the present disclosure, Si is considered to be included in the metals.

[0035] The hard coat layer is preferably formed using a hard coat layer-forming composition containing a polymerizable monomer. The hard coat layer-forming composition may contain, in addition to the polymerizable monomer, the metal oxide fine particles, other components, and a solvent. Examples of other components include a radical polymerization initiator, a cationic polymerization initiator, and a curing catalyst. Other components may also include various additives, such as UV absorbers, antioxidants, coating modifiers, light stabilizers, antioxidants, color inhibitors, dyes, fillers, and internal mold release agents, which are added as needed. 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.

[0036] A method for forming a hard coat layer using a hard coat layer-forming composition includes applying the hard coat layer-forming composition to a substrate (or a primer layer) to form a coating film, and then subjecting the coating film to a curing treatment such as light irradiation treatment and heat treatment. As the curing treatment, either one of light irradiation treatment and heat treatment may be performed, or both may be performed. When both are performed, the light irradiation treatment and heat treatment may be performed simultaneously, or one may be performed first and then the other. After forming the coating film, a drying treatment such as heat treatment may be performed, if necessary, to remove the solvent from the coating film.

[0037] The method for applying the composition for forming a hard coat layer is not particularly limited, and includes known methods (e.g., dipping coating, spin coating, spray coating, inkjet coating, and flow coating). The thickness of the coating film to be formed is not particularly limited, and a thickness that will result in a predetermined hard coat layer thickness is appropriately selected.

[0038] The conditions for the light irradiation treatment are not particularly limited, and appropriate conditions are selected depending on the type of polymerization initiator used. The type of light used for light 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 amount used for light irradiation is not particularly limited, but from the viewpoints of productivity and curability of the coating film, it is preferred to use a light amount of 100 to 3000 mJ / cm. ２ is preferred, and 100 to 2000 mJ / cm ２ The conditions for the heat treatment are not particularly limited, and the optimum conditions are selected depending on the type of polymerization initiator used. The heating temperature is preferably 30 to 100°C, and the heating time is preferably 5 to 360 minutes.

[0039] The thickness of the hard coat layer is not particularly limited, but is preferably 1 μm or more, more preferably 3 μm or more, and even more preferably 10 μm or more. The upper limit of the thickness can be, for example, 30 μm or less. The thickness is an average thickness, and the measurement method is to measure the thickness at any five points on the hard coat layer and calculate the arithmetic average.

[0040] The hard coat layer may contain additives such as a bluing agent, a light stabilizer, and an antioxidant.

[0041] [Anti-reflection film] The spectacle lens includes an anti-reflection film. An anti-reflection film is a layer that has the function of preventing reflection of incident light. Specifically, an embodiment can include an anti-reflection film having low reflection characteristics (broadband low reflection characteristics) over the entire visible range of 380 to 780 nm. The spectacle lens of the present disclosure satisfies the above-mentioned requirement 1, but by adjusting the characteristics of the anti-reflection film, requirement 1 can be satisfied. Furthermore, by adjusting the characteristics of the anti-reflection film, the above-mentioned requirements 2 to 5 can be satisfied.

[0042] The anti-reflection film includes a high refractive index layer and a low refractive index layer. In the anti-reflection film, the high refractive index layer and the low refractive index layer are preferably arranged alternately. That is, when the anti-reflection film includes two high refractive index layers and two low refractive index layers, it is preferable that a low refractive index layer is arranged between two high refractive index layers and a high refractive index layer is arranged between two low refractive index layers. As will be described later, an antistatic layer (e.g., SnO ２ Indium tin oxide (ITO) is indium tin oxide, and indium oxide (In ２ O ３ ) and tin oxide (SnO ２ ) is a mixture of

[0043] The high refractive index layer is preferably a layer having a refractive index of 1.60 or more. The high refractive index layer preferably contains at least one oxide selected from the group consisting of titanium, zirconium, aluminum, niobium, tantalum, and lanthanum. Among these, the high refractive index layer is preferably made of zirconium dioxide (ZrO ２ The high refractive index layer may contain two or more materials.

[0044] The low refractive index layer is preferably a layer having 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 preferably contains silicon dioxide (SiO ２ The low refractive index layer may contain two or more materials.

[0045] The total number of high refractive index layers and low refractive index layers in the antireflection film and preferred embodiments thereof are as described above.

[0046] In the antireflection film, the layer disposed closest to the plastic substrate may be a low refractive index layer or a high refractive index layer.

[0047] In the antireflection film, by adjusting the thickness of each of the low refractive index layer and the high refractive index layer contained therein, the above requirement 1 and requirements 2 to 5 can be satisfied. For example, the thickness of each of the high refractive index layers is preferably 5 to 200 nm, more preferably 5 to 150 nm, and even more preferably 8 to 100 nm. The thickness of each of the low refractive index layers is preferably 10 to 500 nm, more preferably 15 to 450 nm, and even more preferably 20 to 200 nm.

[0048] Preferred embodiments of the antireflection film are exemplified below. In the embodiment (embodiment 1) in which the antireflection film is composed of, in order from the substrate side, a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, a second low refractive index layer, a third high refractive index layer, a third low refractive index layer, a fourth high refractive index layer, and a fourth low refractive index layer, each layer is preferably in the following embodiment. First high refractive index layer: Material: ZrO ２ , thickness: 5 to 15 nm First low refractive index layer Material: SiO ２ , Thickness: 40 to 60 nm Second high refractive index layer Material: ZrO ２ , Thickness: 10 to 20 nm Second low refractive index layer Material: SiO ２ , Thickness: 100 to 200 nm Third high refractive index layer Material: ZrO ２ , Thickness: 5 to 15 nm Third low refractive index layer Material: SiO ２ , Thickness: 20 to 40 nm Fourth high refractive index layer Material: ZrO ２ , Thickness: 40 to 80 nm Fourth low refractive index layer Material: SiO ２ , thickness: 70 to 110 nm

[0049] In the case of an embodiment (embodiment 2) in which the antireflection film is composed of, in order from the substrate side, a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer, each layer is preferably in the following embodiment: First high refractive index layer: Material: ZrO ２ , Thickness: 10 to 20 nm First low refractive index layer Material: SiO ２ , Thickness: 10 to 30 nm Second high refractive index layer Material: ZrO ２ , Thickness: 60 to 100 nm Second low refractive index layer Material: SiO ２ , thickness: 60 to 100 nm

[0050] The method for producing the anti-reflection film is not particularly limited, and examples thereof include dry methods such as vacuum deposition, sputtering, ion plating, ion beam assisted deposition, and CVD.

[0051] The anti-reflection film contains, in addition to the high refractive index layer and the low refractive index layer, SnO ２ The layer may further include a SnO layer or an ITO layer. ２ The SnO layer and the ITO layer can function as an antistatic layer. ２ The positions of the SnO layer and the ITO layer are not particularly limited, and may be between the high refractive index layer and the low refractive index layer. For example, in the eyeglass lens 10 shown in FIG. 1, the SnO layer is disposed between the fourth high refractive index layer 28H and the fourth low refractive index layer 28L. ２ Preferably, a SnO layer or an ITO layer is disposed. ２ The thickness of the ITO layer or the ITO layer can be appropriately set, but is preferably 3 to 20 nm, more preferably 3 to 10 nm. In addition, when an antistatic layer is provided in the above-mentioned embodiment 1, it is preferable to provide the antistatic layer between the fourth high refractive index layer and the fourth low refractive index layer, and a preferable material for the antistatic layer is SnO. ２ and the preferred thickness is 3 to 10 nm.

[0052] [Water- and oil-repellent layer] The eyeglass lens may include a water- and oil-repellent layer. In particular, it is preferable that the eyeglass lens has a water- and oil-repellent layer as the outermost layer. The water- and oil-repellent layer reduces the surface energy of the eyeglass lens, improving the anti-fouling function of the eyeglass lens and improving the slipperiness of the eyeglass lens surface, which in turn improves the abrasion resistance of the eyeglass lens.

[0053] The material constituting the water- and oil-repellent layer is not particularly limited, and examples thereof include fluorine-containing compounds (compounds containing fluorine atoms) and silicon-containing compounds (compounds containing silicon atoms). Among these, the water- 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 material constituting the water- and oil-repellent layer may be used alone or in combination of two or more.

[0054] The organosilicon compound containing fluorine-substituted alkyl group is the organosilicon compound that contains alkyl group in which part or all of hydrogen atom is replaced by fluorine atom, and has hydrolyzable group.Here, the hydrolyzable group is the group that is directly bonded to silicon atom and can proceed hydrolysis reaction and condensation reaction, for example, alkoxy group, halogen atom, acyloxy group, alkenyloxy group and isocyanate group.It should be noted that when a plurality of hydrolyzable groups are directly bonded to one silicon atom, they can be the same or different.

[0055] The hydrolyzate of a fluorine-substituted alkyl group-containing organosilicon compound refers to a compound obtained by hydrolyzing the hydrolyzable groups in a fluorine-substituted alkyl group-containing organosilicon compound. The hydrolyzate may be one in which all of the hydrolyzable groups are hydrolyzed (complete hydrolyzate) or one in which only a portion of the hydrolyzable groups are hydrolyzed (partial hydrolyzate). In other words, the hydrolyzate may be a complete hydrolyzate, a partial hydrolyzate, or a mixture thereof. The hydrolyzed condensate of a fluorine-substituted alkyl group-containing organosilicon compound refers to a compound obtained by hydrolyzing the hydrolyzable groups in a fluorine-substituted alkyl group-containing organosilicon compound and condensing the resulting hydrolyzate. The hydrolyzed condensate may be one in which all of the hydrolyzable groups are hydrolyzed and the hydrolyzate is completely condensed (complete hydrolyzed condensate), or one in which only a portion of the hydrolyzable groups are hydrolyzed and a portion of the hydrolyzate is condensed (partial hydrolyzed condensate). In other words, the hydrolyzed condensate may be a complete hydrolyzed condensate, a partial hydrolyzed condensate, or a mixture thereof.

[0056] The method for forming the water- and oil-repellent layer is not particularly limited and can be selected as desired depending on the materials used, the desired performance, thickness, etc. Examples include a method in which a water- and oil-repellent layer-forming composition containing a fluorine-substituted alkyl group-containing organosilicon compound is applied to a substrate and cured as needed, and a dry method. Coating methods include, for example, dip coating, roll coating, bar coating, spin coating, spray coating, die coating, and gravure coating. Curing treatments include, for example, light irradiation treatment, heat treatment, and water vapor contact treatment. Water vapor contact treatments include, for example, contact with air controlled at a humidity of 50 to 90% RH. The above curing treatments may be performed in combination. Examples of dry methods include the same methods as those used for the antireflective coating described above.

[0057] The thickness of the water- and oil-repellent layer of the spectacle lens is not particularly limited, but is preferably 5 to 35 nm. If the thickness is within the above range, the spectacle lens will have excellent water- and oil-repellent properties.

[0058] The spectacle lenses obtained by the manufacturing method of the present disclosure are suitable for use as lenses for spectacle lenses. Examples of spectacle lenses include spectacle lenses having a known spectacle frame and spectacle lenses, and examples of spectacle frames include those having a pair of lens frames on which spectacle lenses for the right eye and the left eye are respectively mounted, and temples for hanging the spectacle frame on the ears of a user.

[0059] The above-mentioned embodiments will be explained in more detail below with reference to examples and comparative examples, but the present disclosure is not limited to these examples in any way.

[0060] <Simulation> The characteristics of the eyeglass lenses having the configurations of each example and comparative example were evaluated by software simulation. More specifically, the eyeglass lenses having the configurations of the examples and comparative examples shown below were constructed on software (optical thin film design software ThinFilmView (Nary Software), hereinafter also referred to as "TFV"), and the reflectance and the like at a predetermined wavelength range and an incident angle within a predetermined angular range were calculated. The refractive index of air was set to 1.00 in the calculations.

[0061] [Configuration of eyeglass lenses in examples and comparative examples] Eyeglass lenses with the configurations shown in the following table were constructed on a TFV. Comparative example 1 simulates an anti-reflection film with a general four-layer configuration. Comparative example 3 simulates an anti-reflection film with a general nine-layer configuration. The refractive indices shown in the following table are refractive indices at 507 nm.

[0062]

[0063]

[0064] [Average Value X] The average value X was calculated using the following procedure. For the eyeglass lenses of each of the above configurations, light with a wavelength of 507 nm was irradiated from the side having the anti-reflection film, with the normal direction of the eyeglass lens set to 0°, and the angle of incidence was changed in 1° increments within the range of 15 to 60°, and the reflectance at each angle was calculated. The reflectance at each angle calculated above was averaged to obtain the average value X. TFV was used to calculate the reflectance at each angle. In the table below, the average value X is shown in the column for the wavelength range "507" and the angle of incidence range "15 to 60" in the "Average Reflectance" column.

[0065] [Average value Y] The average value Y was calculated in the same manner as for the average value X, except that the incident angle range was changed to 15 to 48° in the procedure for determining the average value X. In the table below, the average value Y is shown in the column for the incident angle range "15 to 48" for the wavelength range "507" in the "Average reflectance" column.

[0066] [Average value Z] The average value Z was calculated in the same manner as for the average value X, except that the incident angle range was changed to 0 to 10° in the procedure for determining the average value X. In the table below, the average value Z is shown in the column for the incident angle range "0 to 10" for the wavelength range "507" in the "Average reflectance" column.

[0067] [Average Value W1] The average value W1 was calculated using the following procedure. For the eyeglass lenses of each of the above configurations, the normal direction of the eyeglass lens was set to 0° from the side having the anti-reflection film, the angle of incidence was set to 15°, and the wavelength of incident light was changed in 1 nm increments in the range of 410 to 675 nm, and the reflectance at each wavelength was calculated. The average value W1 was calculated by arithmetically averaging the reflectance at each wavelength calculated above. In addition, the refractive index of each material was the value of the refractive index at each wavelength. TFV was used to calculate the reflectance at each of the above wavelengths. In the tables below, the average value W1 is shown in the column for the wavelength range "410 to 675" and the angle of incidence range "15" in the "Average Reflectance" column.

[0068] [Average value W2] The average value W2 was calculated in the same manner as for the average value W1, except that the wavelength range was changed to 400 to 700 nm. In the table below, the average value W2 is shown in the column for the wavelength range "400 to 700" and the incident angle range "15" in the "Average reflectance" column.

[0069] [Indicator Pｎｉｇｈｔ ] The index P calculated by the above-mentioned formula (1) ｎｉｇｈｔ The value of T in formula (1) was calculated for the spectacle lenses of each configuration. ＡＲ ５０７ (θ), and T Ｓｕｂ ５０７ (θ) is calculated by the method described above. Ｒ (θ) takes the above-mentioned values ​​depending on the value of θ. That is, at θ=0° and θ=1°, D Ｒ (θ) uses the value of 0° in the table below, and when θ is 2 to 4°, D Ｒ For (θ), the value of 2° in the table below was used. In addition, when θ is 5 to 9°, D Ｒ For (θ), the value of 5° in the table below was used, and for θ = 10 to 14°, the value of 10° in the table below was used. The same applies to θ = 15 to 60°. The values ​​in the table below correspond to the density of rod cells on the temple side of the eye and are based on Osterberg's 1935 research (Topography of the layer of rods and cones in the human retina, Volume 6 of Acta ophthalmologica: Supplementum, GA Osterberg, 1935).

[0070]

[0071] <Results> The results of the simulation for each constituent eyeglass lens are shown in Tables 4 and 5. In Table 4, the column "Improvement rate of transmittance at 18°, 507 nm" lists values ​​calculated as follows. The transmittance value (value of (100 - reflectance)) at the above incident angle and wavelength for Comparative Example 1 was calculated as T １ The transmittance value of Example 1 is T ２ When this is done, 100 × (T ２ -T １ ) / T １The values ​​in the above column for Comparative Example 2 are calculated in the same manner. In Table 5, the values ​​in the "Improvement rate of transmittance at 18°, 507 nm" column are values ​​calculated in the same manner as the values ​​in the "Improvement rate of transmittance at 18°, 507 nm" column in Table 4 above, using Comparative Example 3 as the standard.

[0072]

[0073]

[0074] From the results of Tables 4 and 5, when the average value X is 0.770% or less, the value in the "Transmittance improvement rate at 18°, 507 nm" column and the index P ｎｉｇｈｔ It was confirmed that the value of [masculine or feminine name] increases. When this value increases, the transmittance of light with a wavelength of 507 nm from an oblique direction increases, and therefore it can be said that visibility through the eyeglass lens even in dark places (dark place visibility) is excellent.

[0075] REFERENCE SIGNS LIST 10 eyeglass lens 12 plastic substrate 14 primer layer 16 hard coat layer 18 anti-reflection film 20 water- and oil-repellent layer 22H first high refractive index layer 22L first low refractive index layer 24H second high refractive index layer 24L second low refractive index layer 26H third high refractive index layer 26L third low refractive index layer 28H fourth high refractive index layer 28L fourth low refractive index layer

Claims

1. A spectacle lens comprising a substrate and a multilayer reflective layer including at least one high refractive index layer and at least one low refractive index layer, wherein the angle between the incident light and a normal to a tangent plane at the point where the incident light intersects with the surface of the spectacle lens is changed in increments of 1° within a range of 15 to 60°, the incident light is made to be incident on the spectacle lens, and a reflectance at a wavelength of 507 nm is calculated, and an average value X obtained by arithmetically averaging the reflectances at each calculated angle is 0.770% or less.

2. The eyeglass lens according to claim 1, wherein the angle between the incident light and a normal to a tangent plane at the point where the incident light intersects with the surface of the eyeglass lens is changed in increments of 1° within a range of 15 to 48°, the incident light is incident on the eyeglass lens, and the reflectance at a wavelength of 507 nm is calculated, and an average value Y obtained by arithmetically averaging the reflectance at each calculated angle is 0.390% or less.

3. The eyeglass lens according to claim 1 or 2, wherein an angle between the incident light and a normal to a tangent plane at a point where the incident light intersects the surface of the eyeglass lens is changed in 1° increments within a range of 15 to 48°, the incident light is incident on the eyeglass lens, and a reflectance at a wavelength of 507 nm is calculated, and an average value obtained by arithmetically averaging the reflectance at each calculated angle is defined as average value Y; and an angle between the incident light and a normal to a tangent plane at a point where the incident light intersects the surface of the eyeglass lens is changed in 1° increments within a range of 0 to 10°, the incident light is incident on the eyeglass lens, and a reflectance at a wavelength of 507 nm is calculated, and an average value obtained by arithmetically averaging the reflectance at each calculated angle is defined as average value Z, wherein the average value Y2 is smaller than the average value Z.

4. The spectacle lens according to any one of claims 1 to 3, wherein the angle between the incident light and the normal to the tangent plane at the point where the incident light intersects with the surface of the spectacle lens is set to 15°, and the incident light is made incident on the spectacle lens, and the average reflectance in the wavelength range of 410 to 675 nm is measured to be 1.000% or less.

5. The index P expressed by equation (1) ｎｉｇｈｔ The eyeglass lens according to any one of claims 1 to 4, wherein the value of is 86.0% or more. In formula (1), T ＡＲ ５０７ (θ) represents the transmittance of the spectacle lens at a wavelength of 507 nm when the angle between the incident light and the normal to the tangent plane at the point where the incident light intersects with the surface of the spectacle lens is θ. Ｒ (θ) represents 0 when θ is 0 and 1°, 40 when θ is 2, 3, and 4°, 75 when θ is 5, 6, 7, 8, and 9°, 130 when θ is 10, 11, 12, 13, and 14°, 150 when θ is 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24°, 130 when θ is 25, 26, 27, 28, and 29°, and 130 when θ is 30. , 31, 32, 33, and 34°, 120 when θ is 35, 36, 37, 38, and 39°, 115 when θ is 40, 41, 42, 43, and 44°, 110 when θ is 45, 46, 47, 48, and 49°, 90 when θ is 50, 51, 52, 53, 54, 55, 56, 57, 58, and 59°, and 75 when θ is 60°. Ｓｕｂ ５０７ (θ) represents the transmittance of the substrate at the wavelength of 507 nm at the above θ.

6. The spectacle lens according to any one of claims 1 to 5, wherein the high refractive index layer contains zirconium dioxide, and the low refractive index layer contains silicon dioxide.

7. The spectacle lens according to any one of claims 1 to 6, wherein the multilayer reflective layer further comprises an antistatic layer.

8. The eyeglass lens according to any one of claims 1 to 7, further comprising one or more layers selected from the group consisting of a primer layer, a hard coat layer, and a water-repellent layer.

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