Eyeglass lens

Abstract

An eyeglass lens comprising a lens base material and an antireflective layer that has a multilayer structure and is formed on the lens base material, wherein metal particles are present inside the topmost layer formed on the reverse side of the multilayer structure of the antireflective layer from the lens base material.

Description

Eyeglass lens

[0001] The present disclosure relates to an eyeglass lens, and to an eyeglass lens excellent in antibacterial durability.

[0002] It has been practiced that an antibacterial material containing metal ion-supported zeolite is vapor-deposited on a substrate to form an antibacterial thin film having high transmittance and antibacterial properties (see, for example, Patent Document 1). Further, conventionally, for example, using the technology described in Patent Document 1, production of eyeglass lenses having an antibacterial thin film formed thereon has been carried out.

[0003] Japanese Unexamined Patent Publication No. 2018-12877

[0004] However, even when the surface of an eyeglass lens is scratched, an eyeglass lens that maintains high antibacterial properties (is excellent in antibacterial durability) has not yet been obtained, and development of an eyeglass lens excellent in antibacterial durability has been strongly demanded.

[0005] Under such circumstances, an object of an aspect of the present disclosure is to provide an eyeglass lens excellent in antibacterial durability.

[0006] The inventor of the present invention found that the above problem can be solved by allowing metal particles to exist inside the outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the antireflection layer (that is, embedding the metal particles).

[0007] Embodiments of the present disclosure relate to the following [1] to [4]. [1] An eyeglass lens comprising: a lens substrate; and an antireflection layer having a multilayer structure formed on the lens substrate, wherein metal particles are present inside an outermost layer formed on a side opposite to the lens substrate in the multilayer structure of the antireflection layer. [2] The eyeglass lens according to [1], wherein 20% by mass to 100% by mass of the metal particles based on the total mass of the metal particles are present in a region having a depth of 10 nm to 50 nm from the surface on the side opposite to the lens substrate in the outermost layer. [3] The outermost layer is SiO ２The spectacle lens according to [1] or [2] above, containing ____ as a main component. [4] The spectacle lens according to any one of [1] to [3] above, wherein the metal particles include at least one selected from the group consisting of silver, platinum, gold, palladium, mercury, cadmium, cobalt, nickel, copper, zinc, titanium, molybdenum, and tungsten.

[0008] According to one aspect of the present disclosure, a spectacle lens having excellent antibacterial durability can be provided.

[0009] Fig. 1 is a schematic cross-sectional view of the spectacle lens of the present embodiment. It is a scanning electron microscope (SEM) image showing the surface of the spectacle lens of Example 1 (Part 1). It is a scanning electron microscope (SEM) image showing the surface of the spectacle lens of Example 1 (Part 2). It is a scanning electron microscope (SEM) image showing the cross-section of the spectacle lens of Example 1.

[0010] The following description is based on an example of an embodiment of this disclosure. However, the embodiments shown below are illustrative examples for embodying the technical concept of this disclosure, and this disclosure is not limited to the following description. Embodiments in which any selection or combination of the descriptions in this specification is also included in this disclosure. In this specification, preferred provisions can be selected at will, and combinations of preferred provisions can be said to be more preferred. In this specification, the description "XX to YY" means "XX or more and YY or less". In this specification, the lower and upper limits described in steps for a preferred numerical range (for example, a range of content, etc.) can be combined independently. For example, from the description "preferably 10 to 90, more preferably 30 to 60", the "preferred lower limit (10)" and the "more preferred upper limit (60)" can be combined to get "10 to 60". In this specification, "main component" means containing 50% by mass or more, preferably 60% by mass or more, more preferably 75% by mass or more, and particularly preferably 90% by mass or more, based on the total mass. In this specification, pressure means "absolute pressure based on 0 kPa". In this specification, the amount of each component contained in a composition means the total amount of multiple substances present in the composition unless otherwise specified, if there are multiple substances corresponding to each component in the composition. In this specification, "solids" refers to non-volatile components excluding volatile substances such as solvents, and indicates components that remain without volatilization when the composition is dried, and includes liquid, syrup-like, and wax-like substances at room temperature. In this specification, the term "process" includes not only independent processes, but also processes that cannot be clearly distinguished from other processes, as long as the intended purpose of the process is achieved.

[0011] [Eyeglass Lens] The eyeglass lens of this embodiment comprises a lens substrate and a multilayer anti-reflective layer formed on the lens substrate, wherein metal particles are present inside the outermost layer formed on the side opposite the lens substrate in the multilayer structure of the anti-reflective layer. Because metal particles are present inside the outermost layer formed on the side opposite the lens substrate in the multilayer structure of the anti-reflective layer, the eyeglass lens of this embodiment has excellent antibacterial durability.

[0012] In the eyeglass lens of this embodiment, one or more anti-reflective layers may be formed at any position on either the side of the eyeglass lens opposite the eyeball (hereinafter sometimes referred to as the "object side") and the eyeball side, or on both sides. For example, the eyeglass lens of this embodiment may have an anti-reflective layer between the lens substrate and the water-repellent layer. In this case, the laminate containing at least the anti-reflective layer and the water-repellent layer may be formed on at least one surface of the lens substrate, or on both surfaces. For example, the laminate may be located on the object side of the eyeglass lens of this embodiment, or on the eyeball side of the eyeglass lens of this embodiment, or on both the object side and the eyeball side of the eyeglass lens. When the laminate is located on both sides of the eyeglass lens of this embodiment, the laminate on the object side and the laminate on the eyeball side may be the same laminate or different laminates. If the eyeglass lens of this embodiment has a water-repellent layer, it can also exhibit water repellency, thereby preventing, for example, water staining of the lens. By having an anti-reflective layer, the eyeglass lens of this embodiment can provide anti-reflective performance to the eyeglass lens for light of a specific wavelength or light in a specific wavelength range.

[0013] Figure 1 is a schematic cross-sectional view of the eyeglass lens 1 of this embodiment. In Figure 1, the eyeglass lens 1 comprises a lens substrate 11, a hard coat layer 21f provided on the object-facing side 11a of the lens substrate 11, a multilayer anti-reflective layer 31f provided on the object-facing side 21fa of the hard coat layer 21f, and a water-repellent layer 41f provided on the object-facing side 31fa of the anti-reflective layer 31f. Here, metal particles (not shown) are present inside the outermost layer (not shown) formed on the side opposite to the lens substrate 11 in the multilayer structure of the anti-reflective layer 31f.

[0014] When the lens substrate 11 is a finished lens, the eyeglass lens 1 of this embodiment further comprises a hard coat layer 21b provided on the eyeball-facing surface 11b of the lens substrate 11, an anti-reflective layer 31b provided on the eyeball-facing surface 21bb of the hard coat layer 21b, and a water-repellent layer 41b provided on the eyeball-facing surface 31bb of the anti-reflective layer 31b.

[0015] Although not shown in the figures, a base layer (primer layer) may be provided between the lens substrate 11 and the hard coat layer 21f, or between the lens substrate 11 and the hard coat layer 21b.

[0016] The spectacle lens of this embodiment may be any of the various types of lenses, such as single-focus lenses, multi-focus lenses, or progressive lenses. The type of spectacle lens of this embodiment is determined by the surface shape of both sides of the lens substrate. Furthermore, the surface of the lens substrate may be convex, concave, or flat. In a typical lens substrate and spectacle lens, the surface facing the object is convex, and the surface facing the eyeball is concave. However, this disclosure is not limited thereto. The layers of the spectacle lens of this embodiment will now be described.

[0017] <Lens Substrate> The lens substrate may be either a finished lens or a semi-finished lens. There are no particular restrictions on the surface shape of the lens substrate; it may be flat, convex, concave, etc. The lens substrate may be used for any application, such as for single-focus lenses, multifocal lenses, or progressive lenses. For example, in the case of progressive lenses, the near-vision region (near-vision) and the progressive region (intermediate-vision) are usually included in the aforementioned lower region, and the far-vision region (far-vision) is included in the upper region. Colorless materials are usually used as lens substrates, but colored materials can also be used as long as transparency is not impaired.

[0018] The lens substrate is preferably of the meniscus type. By incorporating a predetermined compound into the meniscus-type lens substrate, astigmatism can be suppressed.

[0019] There are no particular restrictions on the optical center thickness of the lens substrate, but it is preferably 0.5 to 5.0 mm, more preferably 0.5 to 3.0 mm, and most preferably 0.5 to 2.0 mm. There are no particular restrictions on the diameter of the lens substrate, but it is usually about 50 mm to 100 mm.

[0020] There are no particular restrictions on the refractive index ne of the lens substrate with respect to light with a wavelength of 500 nm, but it is preferably 1.49 or higher, more preferably 1.60 or higher, preferably 1.80 or lower, and more preferably 1.75 or lower. The refractive index of the lens substrate is not limited to the above range, and may be within the above range or outside of the above range.

[0021] There are no particular restrictions on the lens substrate; for example, plastic lens substrates; glass lens substrates such as inorganic glass lens substrates; etc. These may be used individually or in combination of two or more. Among these, plastic lens substrates are preferred from the viewpoint of being lightweight, less prone to breakage, and easy to handle.

[0022] There are no particular restrictions on the resin used for the plastic lens substrate. Examples include urethane-based resins such as polythiourethane resin and polyurethane resin; polysulfide resin; episulfide resin; polycarbonate resin; acrylic resin; and the like. These may be used individually or in combination of two or more. Among these, polythiourethane resin, polysulfide resin, and polyurethane resin are preferred, with polythiourethane resin and polysulfide resin being more preferred.

[0023] Furthermore, the lens substrate may be unstained (colorless lens) or stained (stained lens).

[0024] Furthermore, the lens base material may be a lens with refractive power (a so-called prescription lens) or a lens without refractive power (a so-called non-prescription lens).

[0025] <<Method for Manufacturing Lens Substrates>> There are no particular limitations on the steps in the method for manufacturing lens substrates. Examples include a polymerization step in which a polymerizable composition capable of preparing the above-mentioned resin is polymerized and cured, and an annealing step in which the cured resin is annealed.

[0026] (Polymerization process) The polymerization method is preferably a casting polymerization method. The lens substrate is obtained, for example, by injecting a polymerizable composition into a mold that combines a glass or metal mold with a tape or gasket and carrying out polymerization.

[0027] Polymerization conditions can be appropriately set depending on the polymerizable composition. There are no particular restrictions on the polymerization initiation temperature, but it is preferably 0 to 50°C, more preferably 10 to 40°C. It is preferable to raise the temperature from the polymerization initiation temperature and then heat to cure and form the polymer. The maximum temperature to which the temperature is raised is usually 110°C to 130°C.

[0028] (Annealing process) After polymerization is complete, the lens substrate may be released and annealed. There are no particular restrictions on the temperature of the annealing process, but it is preferably 100 to 150°C.

[0029] <Hard Coat Layer> The hard coat layer is a cured film made of a curable composition containing, for example, an inorganic oxide and a silicon compound. The curable composition preferably further contains a polyfunctional epoxy compound.

[0030] <<Inorganic Oxides>> There are no particular restrictions on the inorganic oxides, and examples include silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, tungsten oxide, zinc oxide, tin oxide, beryllium oxide, antimony oxide, etc. These may be used individually or in combination of two or more. Among these, silicon oxide is preferred. Colloidal silica may also be used as the inorganic oxide.

[0031] There are no particular restrictions on the inorganic oxide content, but it is preferably 20 to 80% by mass, more preferably 25 to 70% by mass, and most preferably 25 to 50% by mass, of the solid content of the curable composition.

[0032] <<Silicon Compounds>> There are no particular restrictions on silicon compounds, and examples include silicon compounds having hydrolyzable groups such as alkoxy groups. These may be used individually or in combination of two or more. Among these, silane coupling agents having an organic group bonded to a silicon atom and a hydrolyzable group are preferred. There are no particular restrictions on the organic group bonded to the silicon atom, and examples include epoxy groups such as glycidoxy groups, vinyl groups, methacryloxy groups, acryloxy groups, mercapto groups, amino groups, and phenyl groups. These may be used individually or in combination of two or more. Among these, organic groups having epoxy groups are preferred. The silicon compound may also have an alkyl group bonded to silicon.

[0033] There are no particular restrictions on commercially available silane coupling agents. Examples include those manufactured by Shin-Etsu Chemical Co., Ltd., with product names: KBM-303, KBM-402, KBM-403, KBE402, KBE403, KBM-1403, KBM-502, KBM-503, KBE-502, KBE-503, KBM-5103, KBM-602, KBM-603, KBM-903, KBE-903, KBE-9103, KBM-573, KBM-575, KBM-9659, KBE-585, KBM-802, KBM-803, KBE-846, KBE-9007, etc. These may be used individually or in combination of two or more.

[0034] There are no particular restrictions on the silicon compound content, but it is preferably 20 to 90% by mass, more preferably 30 to 75% by mass, and most preferably 50 to 75% by mass, of the solid content of the curable composition.

[0035] <<Polyfunctional Epoxy Compounds>> A polyfunctional epoxy compound is a polyfunctional epoxy compound containing two or more epoxy groups in one molecule, preferably a polyfunctional epoxy compound containing two or three epoxy groups in one molecule. There are no particular restrictions on commercially available polyfunctional epoxy compounds, and examples include EX-201, EX-211, EX-212, EX-252, EX-313, EX-314, EX-321, EX-411, EX-421, EX-512, EX-521, EX-611, EX-612, EX-614, EX-614B, etc., manufactured by Nagase ChemteX Corporation under the trade name "Denacol". These may be used individually or in combination of two or more.

[0036] There are no particular restrictions on the content of the polyfunctional epoxy compound, but it is preferably 0 to 50% by mass, more preferably 10 to 40% by mass, and most preferably 15 to 30% by mass, of the solid content of the curable composition.

[0037] The curable composition described above can be prepared by mixing the components described above with any other components as needed, such as organic solvents, leveling agents, and curing catalysts. The hard coat layer described above can be formed by applying the curable composition onto a lens substrate and performing a curing treatment (thermal curing, photocuring, etc.). There are no particular restrictions on the means of applying the curable composition, and examples include dipping, spin coating, and spraying. These may be used individually or in combination of two or more. The curing treatment of the curable composition by heating can be performed, for example, by placing a lens coated with the curable composition in an environment with an ambient temperature of 50 to 150°C for about 30 minutes to 3 hours.

[0038] The hard coat layer may be a layer directly laminated onto the surface of the lens substrate, or it may be a layer indirectly laminated onto the surface of the lens substrate via one or more other layers. Other layers include a primer layer, described later, which is provided to improve adhesion. There are no particular restrictions on the type and thickness of these layers; they can be determined according to the desired function and optical properties of the spectacle lens.

[0039] There are no particular restrictions on the thickness of the hard coat layer, but it is preferably 0.1 to 10 μm, more preferably 0.5 to 7 μm, and most preferably 1 to 5 μm.

[0040] <Underlayer (Primer Layer)> The underlayer (primer layer) can be formed from an aqueous resin composition containing at least one type of resin particle selected from the group consisting of polyurethane resin, acrylic resin, and epoxy resin, for example.

[0041] As the above-mentioned aqueous resin composition, commercially available aqueous polyurethanes can be used as is, or diluted with an aqueous solvent as needed. There are no particular restrictions on commercially available aqueous polyurethanes, and examples include the "Evaphanol" series from Nikka Chemical Co., Ltd., the "Superflex" series from Daiichi Kogyo Seiyaku Co., Ltd., the "Adekabontiter" series from ADEKA Corporation, the "Orestar" series from Mitsui Chemicals, Inc., the "Bondic" series and "Hydran" series from Dainippon Ink and Chemicals, Inc., the "Impranil" series from Bayer AG, the "Sofranate" series from Nippon Sofran Co., Ltd., the "Poise" series from Kao Corporation, the "Samplen" series from Sanyo Chemical Industries, Ltd., the "Aizelax" series from Hodogaya Chemical Co., Ltd., and the "Neoretz" series from Zeneca Corporation. These may be used individually or in combination of two or more.

[0042] The underlayer (primer layer) can be formed, for example, by coating the surface of the lens substrate with the above-mentioned aqueous resin composition and then drying it.

[0043] <Anti-reflective layer> The anti-reflective layer is, for example, a multilayer structure of two or more layers having alternating high-refractive-index layers and low-refractive-index layers. There are no particular restrictions on the number of layers in the anti-reflective layer, but it is preferably 4 to 11 layers, more preferably 5 to 8 layers.

[0044] Examples of such an antireflection layer include a multilayer film including one or more layers each of a high refractive index layer and a low refractive index layer. Such an antireflection layer has the property of preventing reflection of light of a specific wavelength or light of a specific wavelength range. In the present specification, the terms "high" and "low" in "high refractive index" and "low refractive index" are relative expressions. That is, a high refractive index layer refers to a layer having a higher refractive index than the low refractive index layer included in the same multilayer film. In other words, a low refractive index layer refers to a layer having a lower refractive index than the high refractive index layer included in the same multilayer film. The film thickness of the high refractive index layer and the film thickness of the low refractive index layer can be determined according to the layer configuration. More specifically, the combination of layers included in the multilayer film and the film thickness of each layer can be determined by optical design simulation based on a known method, on the basis of the refractive index of a film forming material for forming the high refractive index layer and the low refractive index layer, and desired reflection characteristics and transmission characteristics to be imparted to an eyeglass lens by providing the multilayer film. Further, in the multilayer structure of the antireflection layer, one or more layers of a layer containing a conductive oxide as a main component (conductive oxide layer), preferably a deposited film of a conductive oxide formed by vapor deposition using a vapor deposition material containing a conductive oxide as a main component, may be included at any position. The thickness of the multilayer structure of the antireflection layer is not particularly limited, but is preferably 100 to 1000 nm, more preferably 200 to 800 nm, and particularly preferably 300 to 700 nm.

[0045] <<High Refractive Index Layer>> The refractive index of the high refractive index layer is not particularly limited, but at a wavelength of 500 to 550 nm, it is preferably 1.90 to 2.60, more preferably 2.00 to 2.40. The high refractive index layer is a film containing a high refractive index material as a main component. The high refractive index material for forming the high refractive index layer is not particularly limited, and examples thereof include zirconium oxide (for example, ZrO ２ ), tantalum oxide (for example, Ta ２ O ５ ), titanium oxide (for example, TiO ２ ), aluminum oxide (for example, Al ２ O ３ ), yttrium oxide (for example, Y ２ O ３ ), hafnium oxide (for example, HfO ２), niobium oxide (e.g., Nb ２ O ５ Examples include inorganic oxides such as ); these may be used individually or in combination of two or more. Among these, zirconium oxide (e.g., ZrO) ２ ), tantalum oxide (e.g., Ta ２ O ５ ) is preferable.

[0046] <<Low Refractive Index Layer>> There are no particular restrictions on the refractive index of the low refractive index layer, but it is preferably 1.35 to 1.80, more preferably 1.45 to 1.50, at a wavelength of 500 to 550 nm. The low refractive index layer is a film mainly composed of a low refractive index material. There are no particular restrictions on the low refractive index material for forming the low refractive index layer, for example, silicon dioxide (e.g., SiO₂) ２ Inorganic oxides such as ); magnesium fluoride (e.g., MgF ２ ), barium fluoride (e.g., BaF ２ Examples include fluorides such as ) and others. These may be used individually or in combination of two or more. Among these, silicon dioxide (for example, SiO ２ ) is preferable.

[0047] In the examples above, oxides and fluorides are shown in terms of stoichiometric composition for convenience. However, materials that are deficient in or have an excess of oxygen or fluorine in their stoichiometric composition can also be used as high-refractive-index or low-refractive-index materials.

[0048] Such films (e.g., vapor-deposited films) may be formed by depositing a film-forming material (e.g., vapor deposition material) that mainly consists of a high refractive index material or a low refractive index material. The films and film-forming materials may contain impurities that are inevitably mixed in, and may also contain other components, such as other inorganic substances or known additives that play a role in assisting film formation, to the extent that they do not impair the function of the main component. Film formation can be carried out by known film formation methods, and from the viewpoint of ease of film formation, it is preferable to carry out the process by vapor deposition, and more preferably by vacuum deposition.

[0049] An anti-reflective layer can be formed by alternately stacking high-refractive-index layers and low-refractive-index layers using a vacuum deposition method.

[0050] Metal particles are present within the outermost layer (i.e., the uppermost layer at the position furthest from the lens substrate) formed on the opposite side of the multilayer lens substrate. In this specification, "metal particles are present within the outermost layer" means that the metal particles are not attached to the surface of the outermost layer, but rather are present in a region at a predetermined depth from the surface of the outermost layer. Here, the metal particles may be in a state where they are blocked by the outermost layer material (a state in which the metal particles cannot move toward the surface side of the outermost layer), or they may not be blocked by the outermost layer material (a state in which the metal particles can move toward the surface side of the outermost layer), but it is preferable that they are not blocked by the outermost layer material (a state in which the metal particles can move toward the surface side of the outermost layer).

[0051] The outermost layer formed on the opposite side of the multilayer lens substrate is not particularly limited, for example, SiO ２ A layer containing (SiO ２ layer), MgF ２ A layer containing as the main component, BaF ２ Examples include layers containing SiO as the main component. Among these, from the viewpoint of anti-reflection, ２ A layer containing (SiO ２ A layer is preferable.

[0052] There are no particular restrictions on the abundance of metal particles in the region 10 to 50 nm deep from the surface opposite the lens substrate on the outermost surface of the anti-reflective layer, but it is preferably 20 to 100% by mass, more preferably 25 to 98% by mass, and most preferably 30 to 96% by mass, relative to the total mass of metal particles. If the abundance of metal particles in the predetermined region is above the lower limit, antibacterial performance can be achieved. The abundance of metal particles in the predetermined region is measured by the method described in the Examples section below.

[0053] <<Metal Particles>> There are no particular restrictions on the metals to be contained in the metal particles. Examples include silver (Ag), platinum (Pt), gold (Au), palladium (Pd), mercury (Hg), cadmium (Cd), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), titanium (Ti), molybdenum (Mo), tungsten (W), etc. These may be used individually or in combination of two or more. Among these, silver (Ag) and platinum (Pt) are preferred, with silver (Ag) being more preferred, from the viewpoint of their ability to suppress bacterial growth (i.e., antibacterial properties).

[0054] There are no particular restrictions on the form in which metal exists in metal particles. Examples include elemental metal, alloy, inorganic compounds such as metal oxides, organic compounds, and metal ions. In metal particles, for example, silver (Ag) can exist in multiple forms. This is also true for other metals. The inventors of this invention surmise that at least a portion of silver (Ag) can be ionized by oxidation to exhibit antibacterial properties, and that this contributes to the ability of metal particles containing silver (Ag) to function as antibacterial particles. Furthermore, in metal particles containing silver (Ag) as a first metal, along with one or more metals selected from the group consisting of platinum (Pt), gold (Au), palladium (Pd), mercury (Hg), cadmium (Cd), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), titanium (Ti), molybdenum (Mo), and tungsten (W) as a second metal, it is presumed that selecting a second metal that has the effect of controlling the progression of silver oxidation contributes to enhancing the persistence of antibacterial properties. However, this disclosure is not limited to the presumptions described herein.

[0055] Metal particles may, in one form, be metal-containing inorganic particles. Metal-containing inorganic particles may contain metal in the form of an inorganic substance such as a pure metal, an alloy, or an inorganic compound. Inorganic substances are preferred as components for eyeglass lenses, which are often subjected to heating processes during the manufacturing process, because they have high thermal stability and tend not to decompose easily with heat.

[0056] There are no particular restrictions on the average particle size of the metal particles, but it is preferably 1 to 15 nm, more preferably 1 to 10 nm, and most preferably 2 to 5 nm. The average particle size of the metal particles is the particle diameter at the point where the volume-based cumulative particle size distribution reaches 50%, measured using a laser diffraction scattering particle size analyzer (Nikkiso Co., Ltd., model name "Microtrac MT3300EXII").

[0057] There are no particular restrictions on the method for placing metal particles inside the outermost layer of the anti-reflective coating. Examples include thermal deposition, electron beam deposition, and ion-assisted deposition. These can be used individually or in combination of two or more. Thermal deposition is a method in which the deposition material is heated and vaporized by heating the internal atmosphere of the deposition apparatus using a heating means (such as a heater) placed inside the apparatus. Electron beam deposition is a method in which an electron beam is irradiated from an electron gun onto a deposition source in a vacuum, heating and vaporizing the deposition material contained in the deposition source, and depositing it onto the object to be coated. Ion-assisted deposition is a method in which ionized gas particles from a device called an ion gun are irradiated onto the object to be deposited during deposition, thereby pressing the deposition material onto the object.

[0058] For example, if the metal contained in the metal particles is a combination of a first metal (silver) and one or more second metals, the deposition source can be prepared, for example, by the following method: Prepare a liquid containing silver particles (silver particles), which are the first metal (hereinafter also referred to as the "first metal particle-containing liquid"). Such a first metal particle-containing liquid may be, for example, an aqueous dispersion of silver particles. The concentration (content) of silver particles in the first metal particle-containing liquid may be, for example, in the range of 1,000 to 10,000 ppm by mass. Separately from the first metal particle-containing liquid, prepare a liquid containing one or more second metal particles (hereinafter also referred to as the "second metal particle-containing liquid"). Such a second metal particle-containing liquid may be, for example, an aqueous dispersion of second metal particles. Furthermore, as the second metal particle-containing liquid, only one second metal particle-containing liquid containing one or more types of second metal particles may be used, or two or more second metal particle-containing liquids containing one or more types of second metal particles may be used. In either case, the concentration (content) of the second metal particles in the second metal particle-containing liquid may be, for example, in the range of 1,000 to 10,000 ppm by mass. Here, if the second metal particle-containing liquid contains two or more types of second metal particles, the concentration (content) refers to the total concentration (content) of those two or more types of metal particles. As each metal particle-containing liquid, for example, commercially available products sold as aqueous dispersions of metal particles may be used as is, or commercially available products may be diluted before use. After preparing the metal particle-containing liquids in this way, the metal particle-containing liquids are impregnated into the carrier. Multiple types of metal particle-containing liquids may be impregnated into the carrier separately, simultaneously, or a mixture of multiple types of metal particle-containing liquids may be impregnated into the carrier. The volume of the first metal particle-containing liquid impregnated into the carrier may be, for example, in the range of 0.1 to 5.0 mL. The volume of the second metal particle-containing liquid impregnated into the carrier may be, for example, in the range of 0.1 to 5.0 mL. Furthermore, the volume of the second metal particle-containing liquid may be in the range of 0.1 to 5 times the volume of the first metal particle-containing liquid.Here, when two or more second metal particle-containing liquids are used as the second metal particle-containing liquid, the liquid volume refers to the total liquid volume of those two or more second metal particle-containing liquids. Methods for impregnating the carrier with the metal particle-containing liquid include, for example, injecting or spraying the metal particle-containing liquid onto the carrier, or immersing the carrier in the metal particle-containing liquid.

[0059] After impregnating a carrier with a metal particle-containing liquid, a drying process is performed, causing the solvent component (water) in the metal particle-containing liquid to evaporate and the metal particles to be retained on the carrier.

[0060] The above explanation described the case of forming metal particles containing two or more types of metals as an example, but in one form, metal particles may contain only one type of metal. The above explanation can also be used to describe the formation of such metal particles.

[0061] <Water-repellent layer> The eyeglass lens of this embodiment may have a water-repellent layer. In this specification, "water-repellent layer" means a layer that contributes to the surface of the eyeglass lens exhibiting water repellency, or contributes to exhibiting better water repellency compared to the case where there is no such layer. In one embodiment, the eyeglass lens may have a water-repellent layer on the surface of the anti-reflective layer. For example, the water-repellent layer may be a layer directly laminated on the surface of the anti-reflective layer, or a layer indirectly laminated on the surface of the anti-reflective layer via one or more other layers. For other layers, refer to the "underlayer (primer layer)" etc. described above.

[0062] The water-repellent layer may, in one form, be a fluorine-based organic layer. Here, "system" is used to mean "containing". Furthermore, in this specification, "organic layer" refers to a layer containing an organic substance, preferably a layer mainly composed of an organic substance.

[0063] A fluorine-based organic layer can be laminated on an anti-reflective layer by performing a film deposition process using a fluorine-based organic substance as the film-forming material. A preferred film deposition method for forming the fluorine-based organic layer is the dry deposition method, with vapor deposition being more preferable. Since fluorine-based organic substances tend to have lower boiling points compared to other vapor deposition materials, the use of a thermal vapor deposition method is also preferable. A vapor deposition source on which the fluorine-based organic substance is supported can be prepared by impregnating a carrier with a liquid (e.g., a dispersion) containing the fluorine-based organic substance and then performing a drying process.

[0064] An example of a fluorinated organic substance is metaxylenehexafluoride (C ６ H ４ (CF ３ ) ２ Examples include:

[0065] Furthermore, examples of fluorine-based organic substances include fluorine-based organosilane compounds represented by the following general formula (1).

[0066]

[0067] In the above general formula (1), Rf is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, preferably CF ３ -, C ２ F ５ -, C ３ F ７ - is the case. In the above general formula (1), R １ It is a hydrolyzable group, a halogen atom, -OR ３ , -OCOR ３ , -OC(R ３ ) = C(R ４ ) ２ , -ON=C(R ３ ) ２ , -ON=CR ５ Preferably, a chlorine atom, -OCH ３ , -OC ２ H ５ This is more preferable. Here, R ３ R is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, ４ R is a hydrogen atom or an aliphatic hydrocarbon group (e.g., a lower aliphatic hydrocarbon group),５ R is a divalent aliphatic hydrocarbon group having 3 to 6 carbon atoms. In the above general formula (1), R ２ X is a hydrogen atom or a monovalent organic group. The monovalent organic group is preferably an inert group, and more preferably a monovalent hydrocarbon group having 1 to 4 carbon atoms. In the above general formula (1), X is an iodine atom or a hydrogen atom. In the above general formula (1), Y is a hydrogen atom or an alkyl group (for example, a lower alkyl group). In the above general formula (1), Z is a fluorine atom or a trifluoromethyl group. In the above general formula (1), a, b, c, and d are each independently integers in the range of 0 to 200, preferably integers in the range of 1 to 50. In the above general formula (1), e is 0 or 1. In the above general formula (1), m and n are each independently integers in the range of 0 to 2, preferably 0. In the above general formula (1), p is an integer of 1 or more, preferably an integer in the range of 1 to 10.

[0068] Furthermore, there are no particular restrictions on the molecular weight (weight-average molecular weight Mw) of the fluorine-based organosilane compound represented by general formula (1), but it is preferably 5 × 10⁻⁶. ２ ~1 x 10 ５ Range or 5 x 10 ２ ~1 x 10 ４ It is within the range of [the specified range].

[0069] Furthermore, the fluorine-based organosilane compound represented by the above general formula (1) is, in one form, a fluorine-based organosilane compound represented by the following general formula (2).

[0070]

[0071] In the above general formula (2), R １ Y and m are equivalent to those in the general formula (1) above. q is an integer in the range of 1 to 50, and r is an integer in the range of 1 to 10.

[0072] There are no particular restrictions on the thickness t of the water-repellent layer, but it is preferably 0.1 to 100 nm, more preferably 0.1 to 50 nm, and most preferably 0.1 to 20 nm. There are no particular restrictions on the contact angle with water on the surface of the water-repellent layer, but it is preferably 100° or more and 120° or less.

[0073] The water-repellent layer may be formed on the hard coat layer or on the anti-reflective layer, but it is preferable that it be formed on the anti-reflective layer. Furthermore, it is preferable that the water-repellent layer be located on the outermost surface.

[0074] The water-repellent layer can be laminated by performing a film-forming treatment using a film-forming material (water-repellent layer composition) that can function as a water-repellent agent. There are no particular restrictions on the film-forming method, and examples include dry film formation and wet film formation. These may be used individually or in combination of two or more methods.

[0075] There are no particular restrictions on the dry film deposition method; for example, physical vapor deposition and chemical vapor deposition are examples. These may be used individually or in combination of two or more methods. There are no particular restrictions on the wet film deposition method; for example, coating methods are examples.

[0076] Examples of physical vapor deposition methods include evaporation and sputtering. These may be used individually or in combination of two or more methods. Among these, evaporation is preferred.

[0077] In the vapor deposition method, vapor deposition is carried out, for example, by vacuum deposition. While there are no particular restrictions on the heating temperature during vapor deposition in vacuum deposition, it is preferably 400 to 1000°C, more preferably 550 to 1000°C, even more preferably 600 to 1000°C, and particularly preferably 650 to 1000°C. The heating temperature for vapor deposition refers to the temperature at which pellets impregnated with the water-repellent layer composition are heated during vapor deposition. Note that vacuum deposition is performed at 3.0 × 10⁻⁶ －２ It is preferable to carry out the process in a deposition space controlled to a vacuum level of Pa or less.

[0078] Heating during vapor deposition can be achieved using, for example, halogen heaters, resistance heating, or electron guns. Among these methods, using an electron gun allows for the formation of high-precision thin films. The power of the electron gun varies depending on the material used, the deposition apparatus, the vacuum level, and the irradiation area, but preferred conditions are an acceleration voltage of around 6 kV and an applied current of approximately 5 to 40 mA.

[0079] There are no particular restrictions on the deposition time, but it is preferably within 1000 seconds, more preferably within 800 seconds, and most preferably within 600 seconds. By performing deposition within this time, even if multiple water-repellent materials with slightly different deposition start temperatures are used, deposition can be performed almost simultaneously, and a uniform film can be obtained.

[0080] Vapor deposition is preferably carried out using a porous material impregnated with a water-repellent layer composition. As the porous material, fused silica porous bodies and sintered filters made by sintering highly thermally conductive metal powders such as copper or stainless steel are preferred. From the viewpoint of obtaining an appropriate deposition rate, the mesh size of the sintered filter should be 40 to 200 μm, preferably 80 to 120 μm. In addition, pellets made by filling a copper container with steel wool are also suitably used. The water-repellent layer composition may be used as is or as a solution, impregnating the porous material with it.

[0081] There are no particular restrictions on the coating (application) method used to form a water-repellent layer on eyeglass lenses by coating. Examples include dipping, spin coating, spraying, flow coating, doctor blade coating, roll coating, gravure coating, and curtain flow coating. These methods may be used individually or in combination of two or more.

[0082] A heating step may be included after the formation of the water-repellent layer. In the heating step, the reaction between the water-repellent layer composition and the surface of the spectacle lens is promoted. By performing this heating treatment, the deterioration of water repellency due to physical and chemical stresses during daily use, such as wiping the surface of the spectacle lens or the adhesion of detergents, can be suppressed, thereby increasing durability.

[0083] There are no particular restrictions on the heat treatment temperature, but it is preferably 40 to 90°C, more preferably 50 to 80°C, and most preferably 55 to 70°C. There are no particular restrictions on the heat treatment time, but it is preferably 0.5 to 10 hours.

[0084] <Other Layers that the Eyeglass Lens May Contain> The various layers that the eyeglass lens of this embodiment may contain are described below. Examples of other layers that the eyeglass lens of this embodiment may contain include an ultraviolet absorbing layer, an infrared absorbing layer, a photochromic layer, an antistatic layer, an anti-fog layer, and so on. These may be used individually or in combination of two or more types. Known technologies related to eyeglass lenses can be applied to these other layers that the eyeglass lens may contain.

[0085] The film thickness of the various layers contained in eyeglass lenses and the thickness of the lens substrate can be determined, for example, by cross-sectional observation using a scanning electron microscope (SEM).

[0086] The present embodiment will be described in more detail below using examples and comparative examples. However, this disclosure is not limited in any way by the following examples.

[0087] [Observation using a Scanning Electron Microscope (SEM)] A cross-sectional view of the sample was observed using a scanning electron microscope (manufactured by Hitachi High-Tech Corporation). The results of the observation are shown in Figures 2 to 4. The white areas (white grains) observed in Figures 2 and 3 are metal particles (antibacterial particles). The following can be seen from Figures 2 to 4. The metal particles (antibacterial particles) do not exist as a layer, but are embedded in the irregularities of the outermost surface formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer (i.e., they exist inside the outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer). Note that in Figure 4, the metal particles (antibacterial particles) appear to be embedded because the surface irregularities are viewed from the side, and the sample thickness is about 50 nm, so the outermost surface tends to be slightly slanted.

[0088] [Measurement of the abundance of metal particles in a predetermined region] For each spectacle lens in Examples 1 to 5 and Comparative Examples 1 to 2, the content of metal particles in a predetermined region was measured as described below. It was calculated from the percentage of the area occupied by metal particles. The abundance of metal particles in the measured predetermined region is shown in Table 1.

[0089] [Antibacterial Durability Test] Antibacterial durability tests were conducted on each of the spectacle lenses in Examples 1-5 and Comparative Examples 1-2. Specifically, sample pieces were cut from each spectacle lens. The size of the sample pieces was 50 mm x 50 mm. The spectacle lenses were set in a friction and abrasion testing machine designed to allow sliding tests on the substrate under evaluation at a constant load, constant speed, and constant stroke. The media (sliding terminal) used for the test was an eraser wrapped in lens tissue paper. The media was attached to the friction and abrasion testing machine, pressed against the convex surface of the spectacle lens with a load of 2 kg, the stroke was set to 30 mm, and it was slid back and forth 1000 times to wipe and scratch part or all of the surface of the water-repellent layer. The test pieces with part or all of the water-repellent layer surface scratched were placed in a sterilized petri dish with the side with the various layers stacked facing upwards. Then, 1.0 × 10 ５ pieces ~ 4.0×10 ５ A 0.4 mL bacterial solution containing one test bacterium (Staphylococcus aureus or Escherichia coli) is dropped onto the center of the sample surface and covered with a polyethylene film cut to a size of 40 mm x 40 mm. This petri dish is left in an environment with a relative humidity of 90% or higher for 24 hours, and then the 1 cm sample is taken. ２ The number of viable bacteria per sample was measured. The results of evaluating the measured number of viable bacteria according to the following evaluation criteria are shown in Table 1. <Evaluation Criteria for Antimicrobial Durability> A: Antimicrobial activity value of 2.0 or higher B: Antimicrobial activity value of less than 2.0 Note that A is considered good.

[0090] [Example 1] <Preparation of lens substrate with hard coat layer> A hard coat liquid containing inorganic oxide particles and a silicon compound was applied to the entire surface (convex side) of a plastic lens substrate manufactured using a monomer for eyeglass lenses (MR8, manufactured by Mitsui Chemicals, Inc.) by spin coating, and then heated and cured in a furnace at a temperature of 100°C for 60 minutes to form a single layer of hard coat with a thickness of 3 μm.

[0091] <Fabrication of the anti-reflective layer> Next, the lens substrate with the hard coat layer formed on it is placed in a vacuum deposition apparatus, and the entire surface of the hard coat layer is coated with "SiO" by vacuum deposition. ２ Layer / ZrO ２ Layer / SiO ２ Layer / ZrO２ Layer / SiO ２ Layer / ZrO ２ Layer / SiO ２ An anti-reflective layer was formed by laminating a total of seven layers (total thickness: approximately 400-600 nm). The notation " / " indicates that the part described to the left of " / " and the part described to the right are directly laminated. This point is also the same in the following description. In this way, an eyeglass lens having a layer structure of "lens substrate / hard coat layer / anti-reflective layer (inorganic substance content: 90% by mass or more)" was manufactured.

[0092] <Formation of Metal Particles> (Preparation of Evaporation Source) As the first metal particle-containing liquid, an aqueous dispersion containing silver particles with a particle size of 2-5 nm at a concentration of 5000 ppm by mass was prepared. As the second metal particle-containing liquid, an aqueous dispersion containing platinum particles with a particle size of 2-5 nm at a concentration of 5000 ppm by mass was prepared. A disc-shaped sintered filter (material: SUS) with a diameter of 18 mm was used as the carrier. 1.0 mL of the first metal particle-containing liquid was injected into this carrier, and then it was dried in an air oven at an internal temperature of 65-75°C for 1 hour. This was repeated twice (total amount of the first metal particle-containing liquid injected into the carrier: 2.0 mL), and then 1.0 mL of the second metal particle-containing liquid was injected and dried in an air oven at an internal temperature of 65-75°C for 1 hour. This process was repeated twice (total injection volume of the second metal particle-containing liquid into the carrier: 2.0 mL) to prepare a vapor deposition source on which silver particles and platinum particles (vapor deposition materials) were supported.

[0093] (Formation of metal particles by thermal deposition method) An anti-reflective coating on a spectacle lens and a deposition source were placed inside the vacuum chamber of the vacuum deposition apparatus. The internal ambient temperature inside the vacuum chamber was controlled by two halogen heaters. Specifically, in the temperature profile of one heater, the temperature was raised to 600°C over 1 minute and 30 seconds, and then raised from 600°C to 650°C over 4 minutes and 30 seconds. In the temperature profile of the other heater, the heating start time was delayed by 1 minute and 30 seconds compared to the heating start time of the other heater, and the temperature was raised to 600°C over 2 minutes, and then raised from 600°C to 650°C over 4 minutes. The pressure inside the vacuum chamber was 2 × 10⁻⁶ －２The pressure was set to Pa or less. In this way, the silver particles and platinum particles were heated and vaporized, forming the outermost layer SiO2 on the side opposite the lens substrate in the multilayer structure of the anti-reflective layer. ２ Metal particles were placed inside the layer. SiO is the outermost layer formed on the opposite side of the lens substrate in the multilayer structure of the anti-reflective layer. ２ In the layer, in a region from the surface opposite the lens substrate to a depth of 10–50 nm, 95% of the total mass of metal particles was present.

[0094] <Preparation of Water-Repellent Layer> (Preparation of Evaporation Source) A liquid containing metaxylene hexafluoride as a fluorine-based organic substance was prepared. A disc-shaped sintered filter (material: SUS) with a diameter of 18 mm was used as a support. After injecting 0.25 mL of the above liquid into the sintered filter, it was dried in an air oven at an internal temperature of 50°C for 1 hour. In this way, an evaporation source was prepared in which metaxylene hexafluoride (evaporation material) was supported on the sintered filter.

[0095] (Formation of a water-repellent layer by heat deposition method) Inside the vacuum chamber of the vacuum deposition apparatus, the outermost layer of the anti-reflective layer, which is formed on the opposite side of the lens substrate in the multilayer structure of the anti-reflective layer, is SiO ２ An eyeglass lens with metal particles inside the layer and a deposition source were placed inside. The internal atmosphere temperature in the vacuum chamber was controlled to 650°C by a halogen heater, and the pressure inside the vacuum chamber was 2 × 10⁻⁶. －２ A water-repellent layer was deposited by a thermal deposition method with a pressure of Pa or less. By heating the chamber in this way, the metaxylene hexafluoride could be heated and vaporized, forming a deposited film on the surface of the anti-reflective layer in which metaxylene hexafluoride was deposited. In this way, a water-repellent layer (water repellent: metaxylene hexafluoride) with a thickness of 10 to 20 nm was deposited on the surface of the anti-reflective layer. The contact angle of the water-repellent layer was 110°.

[0096] Through the above process, an eyeglass lens of Example 1 was manufactured having the following layer configuration: "lens substrate / hard coat layer (thickness 3 μm) / anti-reflective layer (inorganic layer) (thickness 400-600 nm) / water-repellent layer (fluorine-based organic layer, organic substance content: 90% by mass or more, thickness 10-20 nm)".

[0097] [Example 2] In Example 1, instead of repeatedly injecting 1.0 mL of the first metal particle-containing liquid twice and then repeatedly injecting 1.0 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 2.0 mL, total amount of the second metal particle-containing liquid injected into the carrier: 2.0 mL), the spectacle lens of Example 2 was fabricated in the same manner as in Example 1, except that the outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer is SiO ２ In the layer, in a region from the surface opposite the lens substrate to a depth of 10–50 nm, 75% of the total mass of metal particles was present.

[0098] [Example 3] In Example 1, instead of repeatedly injecting 1.0 mL of the first metal particle-containing liquid twice and then repeatedly injecting 1.0 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 2.0 mL, total amount of the second metal particle-containing liquid injected into the carrier: 2.0 mL), the spectacle lens of Example 3 was fabricated in the same manner as in Example 1, except that the first metal particle-containing liquid was injected twice and then repeatedly injecting 0.6 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 1.2 mL, total amount of the second metal particle-containing liquid injected into the carrier: 1.2 mL). The outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer is SiO ２ In the layer, in a region from the surface opposite the lens substrate to a depth of 10–50 nm, 55% of the total mass of metal particles was present.

[0099] [Example 4] In Example 1, instead of repeatedly injecting 1.0 mL of the first metal particle-containing liquid twice and then repeatedly injecting 1.0 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 2.0 mL, total amount of the second metal particle-containing liquid injected into the carrier: 2.0 mL), the spectacle lens of Example 4 was fabricated in the same manner as in Example 1, except that the first metal particle-containing liquid was injected twice and then repeatedly injecting 0.4 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 0.8 mL, total amount of the second metal particle-containing liquid injected into the carrier: 0.8 mL). The outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer is SiO ２ In the layer, in a region 10–50 nm deep from the surface opposite the lens substrate, metal particles accounted for 35% of the total mass of the metal particles.

[0100] [Example 5] In Example 1, instead of repeatedly injecting 1.0 mL of the first metal particle-containing liquid twice and then repeatedly injecting 1.0 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 2.0 mL, total amount of the second metal particle-containing liquid injected into the carrier: 2.0 mL), the spectacle lens of Example 5 was fabricated in the same manner as in Example 1, except that the first metal particle-containing liquid was injected twice and then repeatedly injecting 0.2 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 0.4 mL, total amount of the second metal particle-containing liquid injected into the carrier: 0.4 mL). The outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer is SiO ２ In the layer, in a region 10–50 nm deep from the surface opposite the lens substrate, metal particles were present at a concentration of 20% by mass relative to the total mass of the metal particles.

[0101] [Comparative Example 1] In Comparative Example 1, instead of repeatedly injecting 1.0 mL of the first metal particle-containing liquid twice and then repeatedly injecting 1.0 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 2.0 mL, total amount of the second metal particle-containing liquid injected into the carrier: 2.0 mL), a spectacle lens of Comparative Example 1 was manufactured in the same manner as in Example 1, except that the first metal particle-containing liquid was injected twice and then repeatedly injecting 0.05 mL of the second metal particle-containing liquid twice (total amount of the first metal particle-containing liquid injected into the carrier: 0.1 mL, total amount of the second metal particle-containing liquid injected into the carrier: 0.1 mL). The outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer is SiO ２ Metal particles were placed on the surface of the layer. SiO was the outermost layer formed on the opposite side of the lens substrate in the multilayer structure of the anti-reflective layer. ２ In the layer, in a region 10–50 nm deep from the surface opposite the lens substrate, metal particles were present at a mass of 0% relative to the total mass of metal particles.

[0102] [Comparative Example 2] A spectacle lens of Comparative Example 2 was manufactured in the same manner as in Example 1, except that the "formation of metal particles by heat deposition method" was not performed.

[0103]

[0104] Table 1 shows that when metal particles are present (i.e., "embedded") within the outermost layer formed on the opposite side of the lens substrate in the multilayer structure of the anti-reflective layer, it exhibits superior antibacterial durability.

[0105] 1. Eyeglass lens 11. Lens base material 11a, 21fa, 31fa Object-side surface 11b, 21bb, 31bb Eyeball-side surface 21f, 21b Hard coat 31f, 31b Anti-reflective layer 41f, 41b Water-repellent layer

Claims

1. An eyeglass lens comprising a lens substrate and a multilayer anti-reflective layer formed on the lens substrate, wherein metal particles are present inside the outermost layer formed on the side opposite to the lens substrate in the multilayer structure of the anti-reflective layer.

2. The spectacle lens according to claim 1, wherein 20 to 100% by mass of metal particles are present in a region of the outermost layer at a depth of 10 to 50 nm from the surface opposite to the lens substrate, relative to the total mass of the metal particles.

3. The outermost layer is SiO ２ An eyeglass lens according to claim 1 or 2, containing as a main component.

4. The spectacle lens according to claim 1 or 2, wherein the metal particles include at least one selected from the group consisting of silver, platinum, gold, palladium, mercury, cadmium, cobalt, nickel, copper, zinc, titanium, molybdenum, and tungsten.

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