Optical lens with narrowband antireflection coating reflecting blue light

Abstract

The present invention relates to an optical lens comprising a substrate and a multi-layer antireflection coating provided on at least one of the main surfaces of the substrate and comprising a stack of at least one layer having a high refractive index and at least one layer having a low refractive index, a spectral reflectance curve of the multi-layer antireflection coating for an angle of incidence in the range of 0 DEG to 15 DEG has a reflection peak centered on a wavelength in the range of 435-450 nm and having a maximum reflectance of less than or equal to 30% and a full width at half maximum of less than or equal to 90 nm, and a local reflectance minimum in the range of 380-420 nm of less than or equal to 2% and a multi-layer antireflection coating for the at least one major surface, the multi-layer antireflection coating providing the at least one major surface with: for an angle of incidence in the range of 0 to 15 degrees, the present invention relates to a light-emitting device comprising a light-emitting element, a light-emitting element, an average light reflection factor Rv of 380 nm to 780 nm of less than or equal to 2.5%, an average blue light reflection factor RmB1 of greater than or equal to 15% in the wavelength range of 420 nm to 450 nm of greater than or equal to 15%, an average blue light reflection factor RmB3 of greater than or equal to 15% in the wavelength range of 440 nm to 460 nm of greater than or equal to 15%, and a ratio RmB1 / RmB3 of less than or equal to 1.

Description

Optical lenses with narrowband anti-reflective coating that reflects blue light

[0001] This invention relates to: optical articles, particularly ophthalmic lenses, comprising a substrate coated with a highly transparent multilayer antireflective coating, typically a filter coating, which can be used to reduce blue light-induced phototoxicity to the retina of an eyeglass wearer, particularly providing protection against blue light emission; and a method of manufacturing such optical articles.

[0002] Visible light to humans extends approximately across a spectrum ranging from 380 nanometers (nm) to 780 nm. The portion of this spectrum from approximately 380 nm to approximately 500 nm corresponds to high-energy blue light (essentially).

[0003] Numerous studies (see, for example, Kitchel E., “The effects of blue light on ocular health”, Journal of Visual Impairment and Blindness, Vol. 94, No. 6, 2000; or GlazerHockstein et al., Retina, Vol. 26, No. 1, pp. 1–4, 2006) have shown that some blue light has phototoxic effects on human eye health, particularly on the retina. Ocular photobiology research indicates that prolonged or intense exposure to blue light may lead to serious eye diseases such as age-related macular degeneration (ARMD) or cataracts.

[0004] ISO 8980-3 (2003) defines the blue light hazard function B(λ) in Table B.1, which is related to the sensitivity of the human eye to low-wavelength spectral emission. In view of this function as shown in Figure 2 of WO 2022 / 258793, it is recommended to limit eye exposure to potentially harmful blue light, particularly with respect to the wavelength band (420–455 nm) which carries an increased risk.

[0005] However, the portion of this blue light's wavelength range that is approximately 465 nm to 495 nm is beneficial to health because it is involved in mechanisms used to regulate biological rhythms known as "circadian rhythm cycles."

[0006] Eyeglass lenses are particularly well-suited to provide protection against potentially harmful blue light penetrating the retina. Furthermore, it is essential to minimize the harmful effects of ultraviolet (UV) light on the wearer's eyes.

[0007] Today, with the increasing use of digital devices such as computers and smartphones, visual fatigue and discomfort have become much more frequent. In addition to the cumulative effects on visual health, several studies have shown that blue light exposure increases glare and visual discomfort. Filtering blue light can notably improve visual function in high-glare conditions.

[0008] In fact, repeated exposure to artificial light, especially with digital devices that emit blue light, has been identified as a cause of eye strain and blurred vision, leading to symptoms of visual fatigue, discomfort, and haziness. This is because blue light is scattered in the environment and enters the eye more than any other type of visible light, thus increasing the effort required to maintain visual focus. This is because blue light has a shorter wavelength and is absorbed and scattered more efficiently by smaller particles than longer wavelengths. According to Rayleigh scattering theory, the amount of scattering is inversely proportional to the fourth power of the wavelength. Other symptoms include eye pain, redness, dryness or inflammation, headache, heaviness and fatigue in the eyes, and temporary or persistent discomfort, depending on the duration of blue light exposure.

[0009] There is a growing need to combine protection against blue-violet light (primarily from sunlight) with visual comfort provided by protection against blue light emission from LEDs that is eye-required around 450 nm from digital devices. Figure 1 of WO 2022 / 258793 shows a typical emission spectrum of a standard cool LED from a digital device (tablet), with a sharp emission peak around 450 nm.

[0010] To adapt to behavioral changes and increasing digital use over the past decade, new types of filtering optical lenses are needed that can minimize the amount of harmful blue light received by the retina for long-term retinal protection, as well as for better comfort.

[0011] Currently, specialized substrates with blue light blocking capabilities are commercially available, but the blue light absorption of these substrates is typically limited to a maximum of 410-420 nm, with very low protection against blue light in the 420-450 nm or 440-460 nm regions.

[0012] For example, patent application WO 2008 / 024414 has suggested using filters that suppress light within a suitable wavelength range to at least partially cut off the troublesome portion of the blue light spectrum from 400 nm to 460 nm by absorption or reflection. This can also be achieved by incorporating a yellow absorbing dye into the optical element.

[0013] WO 2013 / 171434 discloses an ophthalmic lens having a front main surface and a back main surface, at least one of which includes a filter that provides the main surface including said filter with: good angular selectivity defined by the parameter Δ(θ,θ'); and an average blue light reflectance R in the wavelength range of 420 nm to 450 nm. m B1 The coatings disclosed in this application are optimized to provide protection against blue-violet light up to 450 nm by reflection, but they do not provide adequate protection against blue light emission from LEDs in digital devices. They reflect more light in the 420-450 nm range than in the 440-460 nm range, and their transmittance in other wavelengths of the visible light range is not optimal. The spectral reflectivity curves for incident angles greater than or equal to 50° in the range of 0° to 15° have maximum reflectivity at wavelengths less than 435 nm and a full width at half maximum (FWHM) greater than or equal to 80 nm.

[0014] EP 2902817 discloses an optical component comprising a plastic substrate and a multilayer film disposed on at least the rear surface of both surfaces of the plastic substrate. This multilayer film has a maximum reflectance of 3% to 50% in the wavelength range of 380 nm to 780 nm and an average reflectance of 20% or less in the wavelength range of 280 nm to 380 nm. Some examples of EP 2902817 exhibit a broad reflection peak near 450 nm (FWHM > 110 nm), which extends extensively into longer wavelengths in the visible region. This results in an undesirable increase in average light reflectance Rv in the visible range and in chronobiological blue light in the 465–495 nm wavelength range. EP 2902817 fails to disclose adequate protection against blue light (Rv). m B1 Lenses that combine ≥ 15% and satisfactory antireflective properties (Rv ≤ 2.5%) in the visible light range.

[0015] US 2022 / 179237 discloses an eyeglass lens comprising an antireflective coating having: a filtering effect on blue light in the wavelength range of 430 nm to 530 nm or 400 nm to 500 nm; a reflectance profile having a maximum reflectance in the wavelength range of 430 nm to 530 nm or 400 nm to 500 nm and a full width at half maximum (FWHM) ranging from 20 nm to ≤ 55 nm; 70% to 100% transmittance in the remaining wavelength range of visible light between 380 nm and 780 nm; and a blue light filtering effect in the wavelength range of 5% to 40% in the wavelength range of 400 nm to 500 nm or 430 nm to 530 nm. This narrowband filter has a reflection peak centered around 464 nm, which is a major drawback because it significantly overlaps with the chronobiological blue light region (465–495 nm). Furthermore, it is in the 420-450 nm region (R m B1 < 5%) and in the 440-460 nm region (R m B3 The ability to reflect less than 12% of blue light is quite limited, meaning it cannot provide sufficient protection against blue light emissions from LEDs in digital devices. In fact, this narrow-band filter is more effective in the biologically sensitive blue light region than in the harmful blue light region, which is not ideal.

[0016] CN 108132545 discloses a high-transmittance lens for blue light protection. This lens includes a stack of all-dielectric multilayer films with selective transmission attenuation band characteristics (i.e., a high-energy blue light filtering band) on its front side and a stack of broadband multilayer antireflective films in the visible light band on its rear side. The transmittance is less than or equal to 80% in the 420-450 nm region, greater than or equal to 90% in the 465-700 nm region, and less than or equal to 1% in the 300-380 nm region. However, the blue light filter on the front side comprises 35 alternating TiO2 / SiO2 layers. This 35-layer coating is overly complex, difficult to set up, and requires high production costs. Furthermore, the total thickness of this coating is greater than 2000 nm, which is unsuitable for plastic substrates.

[0017] WO 2022 / 258793 discloses an optical lens comprising a multilayer antireflective coating that provides an average blue light reflectance factor R in the wavelength range of 440 nm to 460 nm. m B3The coating is designed for incident angles greater than or equal to 15% in the range of 0° to 15°, and the multilayer antireflective coating exhibits a spectral reflectance profile for incident angles of 0° to 15° with a reflection peak centered at a wavelength greater than or equal to 330 nm and less than or equal to 420 nm, a maximum reflectance less than or equal to 51%, and a full width at half maximum (FWHM) greater than 70 nm. While this coating provides satisfactory protection against LED light emitted by digital devices, its aesthetic properties still require improvement, particularly regarding the residual yellow hue and yellowness in the reflections.

[0018] The primary objective of this invention is to provide an optical lens that offers a high level of protection against harmful blue light, provides greater comfort for the wearer, and exhibits a final color that is widely acceptable to consumers. This lens should also have high anti-reflective properties in the visible light range while maintaining good transparency (i.e., a high level of transmittance in the visible light range).

[0019] The object of this invention is to provide an optical lens that provides visual benefits in front of an LED screen. This lens takes into account the entire light radiation originating from the surrounding area and includes means for reducing the amount of blue light emitted by the LED digital device in the wavelength range of 440 nm to 460 nm received by the eye, taking into account the fact that most commercial optical lenses block less than 10% of light in this wavelength range, which is insufficient to demonstrate an improvement in visual comfort.

[0020] Another object of the present invention is to provide an optical lens that achieves good transmittance in the wavelength range of 465 nm to 495 nm, and more generally in wavelengths greater than 465 nm, so as to maintain good vision for the wearer on the one hand and not alter the circadian rhythm on the other. The difficulty lies in the fact that the wavelength range of 420 nm to 460 nm to be filtered is very close to the wavelength range that should not be filtered or is filtered very little.

[0021] Another object of the present invention is to provide an optical lens comprising a reflective filter having the properties mentioned above, which would be simple and economical to implement at the industry level. Its manufacturing process should be easily integrated into classic manufacturing chains.

[0022] The inventors have discovered that these objectives can be achieved through a coating that is antireflective in the visible light range but not in the blue light range. In the blue light range, this coating acts as a blue light reflective filter and reduces the amount of blue light received by the eye in the wavelength range of 420 nm to 460 nm. Specific and unique designs have been applied to it to improve the aesthetic properties of lenses. In fact, the filtering antireflective coating has been designed as a narrow-band reflective filter near 435-450 nm. This coating has a narrow reflection peak centered in the blue light wavelength range of 435 nm to 450 nm to more efficiently reflect light in the 420-450 nm and 440-460 nm ranges for LED blue light protection, while preventing excessively high maximum reflectivity of the reflection peak. Simultaneously, the R... m B1 (Average reflection in the 420-450 nm range) is controlled to be less than R. m B3 (Average reflection in the 440-460 nm range). This adjustment is necessary to effectively minimize the yellowness of the resulting lens.

[0023] Furthermore, due to the R of the coating of the present invention m B1 and R m B3 The lower the level of the factor, the lower the reflectivity, resulting in weaker residual reflective color and thus improving the aesthetic effect of the lens.

[0024] Therefore, the present invention relates to an optical lens comprising:

[0025] - A substrate having a front main surface and a rear main surface, and

[0026] - A multilayer antireflective coating disposed on at least one of these main surfaces and comprising a stack of at least one layer with a refractive index greater than 1.55 and at least one layer with a refractive index of 1.55 or less, wherein the refractive index is expressed with respect to a wavelength of 550 nm.

[0027] The multilayer antireflection coating exhibits the following spectral reflectance profiles for incident angles ranging from 0° to 15°:

[0028] - A reflection peak centered at a wavelength greater than or equal to 435 nm and less than or equal to 450 nm, possessing a maximum reflectivity of less than or equal to 30% and a full width at half maximum (FWHM) of less than or equal to 90 nm.

[0029] - Local minimum reflectance in the wavelength range of 380 nm to 420 nm, where the local minimum reflectance is less than or equal to 2%.

[0030] The multilayer antireflective coating provides the following properties to the at least one main surface:

[0031] - The average light reflectance factor R from 380 nm to 780 nm as defined by ISO 13666:1998. v It is applicable to incident angles less than or equal to 2.5% within the range of 0° to 15°.

[0032] - Average blue light reflectance factor R in the wavelength range of 420 nm to 450 nm m B1 It applies to incident angles greater than or equal to 15% within the range of 0° to 15°.

[0033] - Average blue light reflectance R in the wavelength range of 440 nm to 460 nm m B3 It applies to incident angles greater than or equal to 15% within the range of 0° to 15°, and

[0034] - Ratio R m B1 / R m B3 It applies to incident angles less than or equal to 1 within the range of 0° to 15°.

[0035] This invention provides novel antireflective coatings designed to provide more effective protection against harmful blue light in the 400-460 nm range, while improving visual comfort and reducing eye strain from prolonged use of LED-based digital devices. These novel filtering antireflective coatings exhibit excellent antireflective efficiency, i.e., a low average light reflectance factor R. v This ensures high clarity in the resulting coated lenses, combining improved blue light cutoff efficiency in the 440-460 nm wavelength range (LED light region), improved blue light cutoff efficiency in the 420-450 nm wavelength range, and generally satisfactory chronobiological blue light transmission in the 465-495 nm wavelength range. These coatings can be specifically applied to blue light-cutting substrates to enhance LED blue light protection.

[0036] Compared to classic narrowband reflective filters, the advantage of the filter coating of this invention is its limited number of layers, typically less than or equal to 14 and preferably ranging from 7 to 11. Typical narrowband reflective filters require more than 15 layers to maintain low reflectivity in the visible light range.

[0037] When considered in conjunction with the accompanying drawings, the foregoing and other objects, features and advantages of the invention will become readily apparent to those skilled in the art upon reading the following detailed description, wherein Figures 1-3 depict the reflection curves of the filtering antireflective coating present on the front main surface of the lenses of Examples 1-8 and Comparative Examples 1-2 described in the Experimental Section for an incident angle of 15° between 380 nm and 780 nm, and Figures 4-6 depict the transmission curves of the optical lenses of Examples 1A-8A and Comparative Examples 1A-2A described in the Experimental Section for an incident angle of 0° between 400 nm and 750 nm. Detailed Implementation

[0038] The terms “comprise” (and any of its grammatical variations, such as “comprises” and “comprising”), “have” (and any of its grammatical variations, such as “has” and “having”), “contain” (and any of its grammatical variations, such as “contains” and “containing”), and “include” (and any of its grammatical variations, such as “includes” and “including”) are all open-ended linking verbs. They are used to indicate the presence of a feature, whole, step, or component or group thereof, but do not exclude the presence or inclusion of one or more other features, wholes, steps, components, or groups thereof. Therefore, a method or a step in a method that “comprises,” “has,” “contains,” or “includes” one or more steps or elements possesses, but is not limited to, possessing only those steps or elements.

[0039] Unless otherwise specified, all figures or expressions relating to quantities of ingredients, ranges, reaction conditions, etc., used herein should be understood to be modified by the term “about” in all cases.

[0040] When an optical article includes one or more surface coatings, the phrase “depositing a coating or layer onto an optical article” means depositing a coating or layer onto the outermost coating of the optical article (i.e., the coating closest to the air).

[0041] In this application, a coating “on” or already deposited on a substrate / coating is defined as a coating that (i) is located above the substrate / coating, (ii) is not necessarily in contact with the substrate / coating, that is, one or more intermediate coatings may be disposed between the substrate / coating and the coating in question (however, preferably in contact with the substrate / coating), and (iii) does not necessarily completely cover the substrate / coating. When “layer 1 is disposed below layer 2”, it is intended to mean that layer 2 is farther from the substrate than layer 1.

[0042] The term "coating" should be understood to mean any layer, stack of layers, or film that can come into contact with a substrate and / or with another coating (e.g., a sol-gel coating or a coating made of pure organic resin). Coatings can be deposited or formed by a variety of methods, including wet processing, gas processing, and membrane transfer.

[0043] In this application, a material-based layer is defined as a layer comprising at least 80% by weight of the material, more preferably at least 90% by weight of the material, or even more preferably a layer composed of layers of the material. For example, a ZrO2-based layer comprises at least 80% by weight of ZrO2.

[0044] The optical articles prepared according to the present invention are transparent optical articles, preferably optical lenses or lens blanks, and more preferably ophthalmic lenses or lens blanks. The ophthalmic lenses may be polarized lenses with or without corrective function, or tinted sunglass lenses.

[0045] Optical articles may be coated with a multilayer antireflective coating according to the invention on their convex main surface (front), concave main surface (back / rear), or both surfaces, but preferably on the convex (front) main surface, to avoid multiple reflections of light reaching the lens. As used herein, in the case of ophthalmic lenses, the back of the substrate is intended to refer to the surface closest to the wearer's eye when the article is in use. This back is typically concave. Conversely, the front of the substrate is the surface furthest from the wearer's eye when the article is in use. This front is typically convex. Optical articles may also be plano articles.

[0046] In an embodiment, the optical lens according to the invention is coated with an anti-reflective coating according to the invention on two surfaces (front main surface and rear main surface). The coatings may be the same or different.

[0047] In another embodiment, the main surface coated with the reflective filter according to the invention is the front main surface of the lens, and the back main surface is coated with a classic antireflective coating or preferably an antireflective coating with low reflection in the UV region, such as those described in WO2012 / 076714.

[0048] In this document, the term "lens" refers to an organic or inorganic glass lens, including a lens substrate, which may be coated with one or more coatings having different properties.

[0049] The term "ophthalmic lens" is used to refer to a lens that is fitted into an eyeglass frame, for example, to protect the eyes and / or correct vision. The lens may be selected from afocal lenses, monofocal lenses, bifocal lenses, trifocal lenses, and progressive lenses. While ophthalmic optics is a preferred area of ​​this invention, it should be understood that the invention can be applied to other types of optical articles, such as lenses for optical instruments used in photography or astronomy, optical aiming lenses, eye protection goggles, optical components of lighting systems, etc.

[0050] In this specification, unless otherwise specified, an optical article / material shall be understood to be transparent when no significant loss of contrast is perceived when an image is viewed through it, i.e., when image formation is obtained through the optical article without adversely affecting the quality of the image. Unless otherwise specified, this definition of the term "transparent" may be applied to all objects as so defined in this specification.

[0051] In the context of this invention, "substrate" should be understood to mean an uncoated substrate and typically has two main surfaces. The substrate can in particular be an optically transparent material having the shape of an optical article (e.g., an ophthalmic lens destined for mounting on eyeglasses). In this context, the term "substrate" should be understood to mean the basic building material of an optical lens, and more particularly, an ophthalmic lens. This material acts as a support for a stack of one or more coatings or layers.

[0052] The substrate can be made of inorganic glass or plexiglass, preferably plexiglass. Plexiglass can be a thermoplastic material (such as polycarbonate and thermoplastic polyurethane) or a thermosetting (crosslinked) material, such as diethylene glycol bis(allyl carbonate) polymers and copolymers (especially CR-39 from PPG Industries). ® Preferred materials for lens substrates include thermosetting polyurethanes, polysulfuric esters (preferably polysulfuric ester resins with a refractive index of 1.60 or 1.67), polyepoxides, polycyclic sulfides (such as polycyclic sulfides with a refractive index of 1.74), and substrates based on poly(meth)acrylates and copolymers, such as substrates containing (meth)acrylate polymers and copolymers derived from bisphenol A, polysulfo(meth)acrylates, and copolymers thereof and blends thereof. Preferred materials for lens substrates are polycarbonate (PC), diethylene glycol bis(allyl carbonate) polymers, and substrates obtained from thermosetting polysulfuric ester resins, which are sold by Mitsui Toatsu Chemicals Co., Ltd. under the MR series, particularly MR-6. ® MR-7® and MR-8 ® Resins. These latter substrates and the monomers used in their preparation are particularly described in patents US 4,689,387, US 4,775,733, US 5,059,673, US 5,087,758 and US 5,191,055.

[0053] Before depositing antireflective coatings or other functional coatings, the surface of the article is typically subjected to physical or chemical surface activation and cleaning pretreatment to improve the adhesion of the layer to be deposited, as disclosed in WO 2013 / 013929. This pretreatment is usually performed on the surface of abrasion-resistant and / or scratch-resistant coatings (hard coatings).

[0054] This pretreatment is typically performed under vacuum. Pretreatment can be bombardment with high-energy materials, such as ion beam methods (“ion pre-cleaning” or “IPC”) or electron beam methods, corona treatment, ion spallation treatment, ultraviolet treatment, or vacuum plasma treatment (typically using oxygen or argon plasma). Pretreatment can also be acid or alkali surface treatment and / or solvent surface treatment (using water or organic solvents) with or without ultrasonic treatment. Many treatments can be combined. Due to these cleaning treatments, the cleanliness of the substrate surface is optimized.

[0055] High-energy matter refers to matter having an energy range of 1 to 300 eV, preferably 1 to 150 eV, more preferably 10 to 150 eV, and most preferably 40 to 150 eV. High-energy matter can be chemical substances such as ions, free radicals, or substances such as photons or electrons.

[0056] Antireflective coatings are commonly used in optical devices, particularly ophthalmic optics. An antireflective coating is a coating deposited on the surface of a workpiece that improves the antireflective properties of the final product. Antireflective coatings reduce the reflection of light at the workpiece / air interface across a relatively broad portion of the visible spectrum. The optical properties of this coating, such as reflectivity, arise from interference caused by multiple reflections at the air / layer and substrate / layer interfaces.

[0057] The antireflective coating of this invention is configured to suppress the transmission of at least a portion of blue light within a selected wavelength range by reflection. Therefore, it is referred to as a "blue light cutoff filter" and can be used for protective purposes. By reflecting light within the selected wavelength range, potentially harmful light does not reach the wearer's eyes. This is particularly relevant to the presence of blue light harmful to the retina in the 420 nm–450 nm range and / or in the 440 nm–460 nm range.

[0058] As used in this paper, if a means suppresses at least some transmission within a selected wavelength range by reflection, then the means reflects that range while having little or no effect on wavelength reflection near that wavelength range.

[0059] The multilayer antireflective coating of the present invention comprises a stack of at least one high refractive index layer with a refractive index greater than 1.55 and at least one low refractive index layer with a refractive index of 1.55 or less.

[0060] More preferably, the multilayer antireflective coating comprises at least two layers having a low refractive index (LI) and at least two layers having a high refractive index (HI). The multilayer antireflective coating preferably comprises at least three layers having a high refractive index (HI). The total number of layers in the antireflective coating is preferably greater than or equal to 3, more preferably greater than or equal to 4 or 5. The total number of layers is preferably less than or equal to 14, 12, or 11. In one embodiment, it ranges from 4 to 12, and more preferably from 7 to 11. The narrowband filter of the present invention does not have so many layers, and is therefore easier and less costly to manufacture compared to highly selective filters that typically consist of generally thick stacks and / or include a very large number of dielectric layers.

[0061] The inventors discovered that when more layers are used in an antireflective coating, it becomes easier to design coatings with high R-values. m B1 and R m B3 Reflectance factor, low R v and R m B2 A coating with a lower FWHM, where the reflection peak is in the 435-450 nm range. In other words, to achieve the same level of R... m B3 Antireflective coatings with more layers can be designed to have lower R-values. v Lower R m B2 and higher R m B1 The following section defines various reflection factors.

[0062] As used herein, antireflective coating layers are defined as having a thickness greater than or equal to 1 nm. Therefore, when counting the number of layers in an antireflective coating, any layer with a thickness less than 1 nm will not be considered. Optional sublayers and layers located beneath sublayers are not considered when counting the number of layers in an antireflective coating or when indicating its thickness.

[0063] The HI and LI layers do not necessarily have to alternate in the stack, but they can alternate according to one embodiment of the invention. Two HI layers (or more) can be deposited one on top of the other, and two LI layers (or more) can also be deposited one on top of the other.

[0064] In this application, when the refractive index of the antireflective coating layer is greater than 1.55, preferably greater than or equal to 1.6, even more preferably greater than or equal to 1.8 or 1.9, and most preferably greater than or equal to 2, it is referred to as a high refractive index (HI) layer. The HI layer preferably has a refractive index less than or equal to 2.2 or 2.1. When the refractive index of the antireflective coating layer is less than or equal to 1.55, preferably less than or equal to 1.52, more preferably less than or equal to 1.48 or 1.47, it is referred to as a low refractive index (LI) layer. The LI layer preferably has a refractive index greater than or equal to 1.1.

[0065] The HI layer typically contains one or more metal oxides, such as, but not limited to, zirconium oxide (ZrO2), titanium oxide such as titanium dioxide (TiO2), aluminum oxide (Al2O3), tantalum pentoxide (Ta2O5), neodymium pentoxide (Nd2O5), praseodymium oxide (Pr2O3), praseodymium titanate (PrTiO3), La2O3, Nb2O5, and Y2O3.

[0066] Optionally, the HI layer may further contain silicon dioxide or other materials with low refractive index, provided that they have a refractive index greater than 1.55 as indicated above. Preferred materials include ZrO2, PrTiO3, Nb2O5, Ta2O5, Y2O3, and mixtures thereof.

[0067] The most preferred materials are TiO2 and Ta2O5. Compared to other materials such as ZrO2, antireflective coatings using TiO2 or Ta2O5 as high-refractive-index materials are thinner (for stacks with the same number of layers). Furthermore, to achieve the same level of R... m B3 Antireflective coatings using TiO2 or Ta2O5 as high refractive index materials can be designed to have lower Rreflectance. v and lower R m B2 The following section defines various reflection factors.

[0068] The LI layer is also well known and may include, but is not limited to, SiO2, MgF2, ZrF4, AlF3, Na5Al3F. 14 Na3[AIF6], or a mixture of silica and alumina (especially silica doped with alumina), alumina helps to improve the heat resistance of the antireflective coating. The LI layer is preferably a layer containing at least 80% by weight of silica relative to the total weight of the layer, more preferably at least 90% by weight of silica, and even more preferably composed of a silica layer.

[0069] Optionally, the LI layer may further contain a material with a high refractive index, provided that the refractive index of the resulting layer is less than or equal to 1.55.

[0070] The outermost layer of the antireflective coating, i.e., the layer furthest from the substrate, is typically a low-refractive-index layer with a refractive index of 1.55 or less and a thickness preferably greater than or equal to 100 nm. This layer may be a silicon dioxide-based layer containing at least 80% by weight of silicon dioxide relative to the total layer weight, more preferably at least 90% by weight of silicon dioxide (e.g., a silicon dioxide layer doped with alumina), and even more preferably composed of a silicon dioxide layer.

[0071] The innermost layer of the antireflective coating, that is, the layer that is in direct contact with the sublayer (when present) or the substrate, is preferably a high refractive index layer.

[0072] Typically, HI and / or LI layers have a physical thickness ranging from 5 nm to 150 nm, preferably from 8 nm to 120 nm. Their thickness can vary considerably, depending, for example, on the desired properties of the layer, the layer material, the deposition technique, and / or the layer location within the stack.

[0073] Typically, the total thickness of the antireflective coating is less than or equal to 1 µm, preferably less than or equal to 800 nm, more preferably less than or equal to 700 nm, and even more preferably less than or equal to 650, 600, or 500 nm. The total thickness of the antireflective coating is typically greater than or equal to 100 nm, preferably greater than or equal to 150 or 200 nm. In one embodiment, it ranges from 200 nm to 700 nm, more preferably from 250 nm to 560 nm.

[0074] In a particular embodiment of the invention, the antireflective coating comprises 7 to 11 layers and has a total thickness preferably ranging from 350 nm to 600 nm.

[0075] Furthermore, the optical article exhibits good tolerance to heat and temperature changes, i.e., a high critical temperature. In this patent application, the critical temperature of the article is defined as the temperature at which cracks begin to appear in the coating present on the surface of the substrate (on any main surface), leading to degradation of the coating, typically an antireflective coating. The critical temperature of the coated article according to the invention is preferably ≥ 70°C, more preferably ≥ 75°C, 80°C, 90°C, 100°C, or 110°C.

[0076] R can also be defined T1 The ratio, which is relative to R as defined in US 7692855 T The differences are slight:

[0077] For the R T1 The ratio calculation only considers the layers of the interference coating, that is, only the layers located above the optional sublayers.

[0078] In one embodiment, R T1 The denoted value is greater than or equal to 1, preferably greater than or equal to 1.1, 1.2, 1.3, 1.45, 1.46, 1.47, 1.48, 1.5, 1.6, 1.7, or 1.8. In one embodiment, R... T1 Less than or equal to 2.5, preferably less than or equal to 2. To enable the product to exhibit a higher critical temperature while also demonstrating high wear resistance, a high R0 is preferred. T1 ratio.

[0079] In this invention, a multilayer antireflective coating can be deposited onto a single sublayer having a thickness greater than or equal to 120 nm. It should be noted that this sublayer is not part of the antireflective coating itself. Preferably, the sublayer is in direct contact with the antireflective coating.

[0080] As used herein, an antireflective coating sublayer or adhesive layer is intended to mean a relatively thick coating used to improve the mechanical properties of the antireflective coating (such as abrasion resistance and / or scratch resistance) and / or to enhance its adhesion to the substrate or undercoat.

[0081] The thickness of the sublayer is typically less than or equal to any of the following values: 600 nm, 500 nm, 450 nm, 400 nm, 375 nm, 300 nm, or 250 nm. The sublayer has a thickness greater than or equal to 120 nm, preferably greater than or equal to 125, 130, 140, 150, 160, or 180 nm. Increasing the thickness of the sublayer improves abrasion resistance, but preferably to a degree that may result in light absorption, depending on the properties of the sublayer, and can significantly reduce the visual transmittance factor T. v .

[0082] The sublayer is preferably a SiO2-based layer comprising, preferably at least 80% by weight of silicon dioxide, more preferably at least 90% by weight of silicon dioxide relative to the total weight of the layer; and even more preferably, composed of a silicon dioxide layer. In another embodiment, this SiO2-based layer is a silicon dioxide layer doped with alumina in the amount defined above, preferably composed of an alumina-doped silicon dioxide layer.

[0083] The sublayers of the antireflective coating are a class of layers that are readily identifiable and well-known to those skilled in the art and should not be confused with the abrasion-resistant and / or scratch-resistant coatings (hard coatings) described later in this application.

[0084] Single-layer sublayers are preferred. However, sublayers can be laminated (multilayered), especially when there is a significant difference in refractive index between the sublayer and the underlayer coating (or substrate, if the sublayer is deposited directly onto the substrate). This is particularly true when the underlayer coating (which is typically an abrasion-resistant and / or scratch-resistant coating) or the substrate has a high refractive index (in other words, a refractive index greater than or equal to 1.55, preferably greater than or equal to 1.57).

[0085] In this configuration, in addition to a layer having a thickness typically greater than or equal to 120 nm (referred to as the master layer), the sublayer may also include preferably up to two or three other layers (“impedance layers”) inserted between the optionally coated substrate and the master layer (which is typically a silica-based layer). These additional layers are preferably thin and function to limit multiple reflections at the sublayer / undercoat interface or at the sublayer / substrate interface (whichever applies).

[0086] In addition to the main layer, the multilayer sublayers preferably include a layer with a high refractive index and a thickness of less than or equal to 80 nm, more preferably less than or equal to 50 nm, and even more preferably less than or equal to 30 nm. This layer with a high refractive index directly contacts either the substrate with a high refractive index or the undercoating with a high refractive index (either is acceptable). Of course, this embodiment can also be used even if the substrate (or undercoating) has a refractive index of less than 1.55.

[0087] Alternatively, in addition to the main layer and the previously mentioned high-refractive-index layer, the sublayer also includes a layer of SiO2-based material (i.e., preferably containing at least 80% silicon dioxide by weight), having a refractive index of less than or equal to 1.55, 1.52, or 1.5, and a thickness preferably less than or equal to 80 nm, more preferably less than or equal to 50 nm, and even more preferably less than or equal to 30 nm, on which the high-refractive-index layer is deposited. Typically, in this case, the sublayer comprises a 25 nm thick SiO2 layer, a 10 nm thick ZrO2 or Ta2O5 layer, and the sublayer main layer, deposited in this order onto an optionally coated substrate.

[0088] Optionally, prior to depositing the first layer of the antireflective coating, the exposed surfaces of the sublayers (if present) may be subjected to a physical or chemical activation treatment, which may be selected from pretreatments that the substrate may undergo prior to depositing the sublayers and which have already been mentioned above. A preferred pretreatment is ion bombardment, for example, using an argon ion beam generated by an ion gun. Such physical or chemical activation treatment (preferably ion bombardment) may also be applied to the exposed surfaces of one or more layers of the multilayer antireflective coating prior to depositing subsequent layers of the multilayer antireflective coating.

[0089] The optical articles of the present invention can be made antistatic by incorporating at least one conductive layer into a stack present on the surface of the article, preferably in an antireflective coating, that is, by not retaining and / or forming a large amount of static charge.

[0090] The ability of a lens to dissipate static charge (charges applied by corona, etc.) after being rubbed with a cloth or through any other procedure can be quantified by measuring the time required for the charge to dissipate. Thus, antistatic lenses have discharge times of approximately several hundred milliseconds, preferably 500 ms or less, compared to approximately tens of seconds for electrostatic lenses. In this application, the discharge time is measured according to the method disclosed in French application FR 2943798.

[0091] As used herein, "conductive layer" or "antistatic layer" is intended to mean a layer that, due to its presence on the surface of a substrate, reduces the ability of an optical article to attract dust / particles due to charge accumulation. Preferably, when applied to a non-antistatic substrate (i.e., having a discharge time greater than 500 ms), the antistatic layer, after static charge is applied to its surface, enables the lens to not retain and / or form a large amount of static charge, for example, having a discharge time of 500 ms or less, thereby preventing fine dust particles from adhering to the optical article due to antistatic effects.

[0092] The conductive layer can be located at different positions within the stack, typically within or in contact with the antireflective coating, provided that its reflective or antireflective properties are not affected. The conductive layer is preferably located between two layers of the antireflective coating, and / or preferably adjacent to a high-refractive-index layer of such antireflective coating. In embodiments, the conductive layer is located directly beneath a low-refractive-index layer of the antireflective coating, most preferably in the penultimate position of the antireflective coating (directly beneath the outermost layer of the antireflective coating) in a direction away from the substrate.

[0093] The conductive layer should be thin enough not to alter the transparency of the antireflective coating. The conductive layer is preferably made of a conductive and highly transparent material (typically an optionally doped metal oxide). In this case, the thickness of the conductive layer preferably ranges from 1 to 50 nm, more preferably from 1 to 30 nm, 1 to 15 nm, or 1 to 10 nm, ideally from 2 to 8 nm. Preferably, the conductive layer comprises an optionally doped metal oxide selected from indium, tin, zinc oxides, and mixtures thereof. Preferred are indium tin oxide (In₂O₃:Sn, indium oxide doped with tin), aluminum-doped zinc oxide (ZnO:Al), indium oxide (In₂O₃), and tin oxide (SnO₂). In the most preferred embodiment, the conductive layer and the optically transparent layer are indium tin oxide layers, referred to as ITO layers or SnO₂ layers.

[0094] Typically, conductive layers, when they have a small thickness, contribute (but in a limited way) to antireflective properties within a stack and typically represent layers with a high refractive index in such coatings.

[0095] The conductive layer can be deposited by any suitable method, such as by vacuum evaporation deposition, preferably by ion beam assisted deposition (hereinafter IAD) to improve its transparency, or by means of cathode sputtering.

[0096] The conductive layer can also be a very thin layer of noble metal (Ag, Au, Pt, etc.), typically less than 1 nm thick and preferably less than 0.5 nm thick.

[0097] Different layers and sublayers (if present) of the antireflective coating are preferably deposited under vacuum by vapor deposition according to any of the following methods: i) by evaporation, optionally with ion beam assistance; ii) by ion beam spraying; iii) by cathode sputtering; iv) by plasma-assisted chemical vapor deposition. These different methods are described in the following references, “Thin Film Processes” and “Thin Film Processes II”, edited by Vossen & Kern, Academic Press, 1978 and 1991, respectively. Vacuum evaporation is particularly recommended. Preferably, the deposition of each of the aforementioned layers is performed by vacuum evaporation. This process advantageously avoids heating the substrate, which is particularly significant for coating heat-sensitive substrates such as plexiglass.

[0098] The processing steps can also be performed using high-energy materials as previously defined, simultaneously depositing one or more layers or sublayers of different layers of the antireflective coating. Specifically, working with ion assistance allows the layers to be compressed during formation, increasing their compressibility and refractive index. Layers produced using ion assistance during deposition are structurally different from those deposited without ion assistance.

[0099] Ion-assisted deposition (IAD) methods are notably described in U.S. Patent Application 2006 / 017011 and U.S. Patent 5268781. Ion-assisted vapor deposition comprises depositing a layer onto a substrate, preferably by bombarding the layer simultaneously with a particle beam, while the material layer is forming, preferably by means of an ion gun. Ion bombardment causes atomic rearrangement in the forming coating, increasing its density. IAD not only allows for improved adhesion of the deposited layer but also allows for increased refractive index. IAD operations can be performed by means of an ion gun, where ions are particles composed of gas atoms from which one or more electrons are extracted. It preferably involves bombarding the surface to be treated with oxygen ions. Other ionized gases, such as argon, nitrogen, and especially mixtures of O2 and argon (in a volume ratio ranging from 2:1 to 1:2), can be used, either in combination with or without oxygen. WO 2020 / 104392 discloses a preferred IAD process for thin-layer deposition according to the invention.

[0100] According to a particularly preferred embodiment, starting from the surface of a substrate optionally coated with one or more functional coatings (such as a primer coating and / or a hard coating), the optical lens includes an optional sublayer and an antireflective coating. The sublayer has a thickness of 100 to 300 nm, more preferably 110 to 250 nm, and even more preferably 120 to 225 nm, preferably a silica-based sublayer. The antireflective coating contains, in the following order: a high refractive index layer having a thickness of 25 to 70 nm, preferably 30 to 65 nm; a low refractive index layer having a thickness of 20 to 45 nm, preferably 25 to 40 nm, preferably a silica layer; a high refractive index layer having a thickness of 40 to 60 nm, preferably 45 to 55 nm; a low refractive index layer having a thickness of 25 to 80 nm, preferably 30 to 75 nm, preferably a silica layer; and a high refractive index layer having a thickness of 10 to 35 nm, preferably 15 to 30 nm. A layer having a thickness of 35 to 60 nm, preferably 40 to 55 nm, preferably a silicon dioxide layer; optionally a conductive layer having a thickness of 3 to 15 nm, preferably 4 to 8 nm, preferably a layer made of tin oxide or ITO; and a layer having a low refractive index having a thickness of 100 to 140 nm, preferably 110 to 130 nm, preferably a silicon dioxide layer.

[0101] Antireflective coatings / sublayers (optionally) can be deposited directly onto a bare substrate. In some applications, it is preferred that the main surface of the substrate be coated with one or more functional coatings prior to the deposition of the antireflective coating of the present invention to improve its optical and / or mechanical properties. These functional coatings conventionally used in optics can be, but are not limited to, impact-resistant primers, abrasion-resistant coatings and / or scratch-resistant coatings (hard coatings), polarizing coatings, antistatic coatings, photochromic coatings, coloring coatings, or stacks of two or more such coatings.

[0102] The impact-resistant primer coating that can be used in this invention can be any coating typically used to improve the impact resistance of finished optical articles. By definition, an impact-resistant primer coating is a coating that improves the impact resistance of a finished optical article compared to an identical optical article without an impact-resistant primer coating.

[0103] Typical impact-resistant primer coatings are based on (meth)acrylic acid and polyurethane. Specifically, the impact-resistant primer coating according to the present invention can be made from latex compositions such as poly(meth)acrylic acid latex, polyurethane latex, or polyester latex.

[0104] Preferred primer compositions include: thermoplastic polyurethane-based compositions, such as those described in patents JP 63-141001 and JP 63-87223; poly(meth)acrylic primer compositions, such as those described in patents US 5,015,523 and US 6,503,631; thermosetting polyurethane-based compositions, such as those described in patent EP 0404111; and compositions based on poly(meth)acrylic latex or polyurethane latex, such as those described in patents US 5,316,791 and EP0680492. Preferred primer compositions are polyurethane-based compositions and latex-based compositions, particularly polyurethane latex, poly(meth)acrylic latex, and polyester latex, and combinations thereof. In one embodiment, the impact-resistant primer includes colloidal fillers.

[0105] Poly(meth)acrylic latex is a latex based on a copolymer made primarily of (meth)acrylates (such as ethyl (meth)acrylate, butyl (meth)acrylate, methoxyethyl (meth)acrylate, or ethoxyethyl (meth)acrylate) with typically low amounts of at least one other comonomer (such as styrene).

[0106] Commercially available primer compositions suitable for use in this invention include Witcobond. ® 232. Witcobond ® 234. Witcobond ® 240. Witcobond® Composition 242 (sold by Baxendenchemicals), Neorez ® R-962, Neorez ® R-972, Neorez ® R-986 and Neorez ® R-9603 (sold by ZENECA RESINS) and Neocryl ® A-639 (sold by DSM Coating Resins).

[0107] After curing, the thickness of the impact-resistant primer coating typically ranges from 0.05 to 30 µm, preferably from 0.2 to 20 µm, and more particularly from 0.5 to 10 µm, and even better from 0.6 to 5 µm or 0.6 to 3 µm, and most preferably from 0.8 to 1.5 µm.

[0108] The impact-resistant primer coating is preferably in direct contact with the abrasion-resistant coating and / or the scratch-resistant coating. In one embodiment, the refractive index of the impact-resistant primer coating is in the range of 1.45 to 1.55. In another embodiment, the refractive index of the impact-resistant primer coating is greater than or equal to 1.55.

[0109] Abrasion-resistant coatings and / or scratch-resistant coatings can be any layer traditionally used as abrasion-resistant coatings and / or scratch-resistant coatings in the field of optical lenses.

[0110] Abrasion-resistant and / or scratch-resistant coatings are preferably hard coatings based on poly(meth)acrylate or silane, which typically include one or more inorganic fillers designed to improve the hardness and / or refractive index of the coating once cured.

[0111] The wear-resistant coating and / or scratch-resistant coating is preferably prepared from a composition comprising at least one alkoxysilane and / or its hydrolysis product, which is obtained, for example, by hydrolysis with hydrochloric acid solution and optionally by condensation and / or curing catalyst.

[0112] Suitable coatings recommended for this invention include coatings based on epoxy silane hydrolysis products, such as those described in patents EP0614957, US 4211823, and US 5015523.

[0113] The preferred abrasion-resistant and / or scratch-resistant coating composition is the composition disclosed in patent EP 0614957 in the name of the applicant. It comprises hydrolysis products of epoxytrialkoxysilane and dialkyldialkoxysilane, silica gel, and a catalytic amount of an aluminum-based curing catalyst (such as aluminum acetylacetonate), with the remainder consisting essentially of solvents conventionally used to formulate such compositions. Preferably, the hydrolysis products used are hydrolysis products of γ-glycidoxypropyltrimethoxysilane (GLYMO) and dimethyldiethoxysilane (DMDES).

[0114] The abrasion-resistant and / or scratch-resistant coating composition can be deposited by known methods and then preferably cured using heat or ultraviolet radiation. The thickness of the (cured) abrasion-resistant and / or scratch-resistant coating typically varies from 2 to 10 µm, preferably from 3 to 5 µm.

[0115] The optical articles according to the invention may further include coatings formed on the antireflective coating and capable of altering its surface properties, such as hydrophobic coatings and / or oleophobic coatings (antifouling coatings). These coatings are preferably deposited on the outer layer of the antireflective coating. Typically, their thickness is less than or equal to 10 nm, preferably ranging from 1 to 10 nm, more preferably from 1 to 5 nm. The antifouling coating is typically a fluorosilane or fluorosilazane type coating, preferably containing a fluoropolyether portion and more preferably a perfluoropolyether portion. More detailed information about these coatings is disclosed in WO 2012 / 076714.

[0116] Instead of hydrophobic coatings, hydrophilic coatings (anti-fog coatings) that provide anti-fog properties can be used, or anti-fog precursor coatings that provide anti-fog properties when associated with a surfactant. Examples of such anti-fog precursor coatings are described in patent application WO2011 / 080472.

[0117] Additional coatings (such as primers), hard coatings, and antifouling surface coatings can be deposited onto the main surface of a substrate using methods known in the art, including spin coating, dip coating, spray coating, vapor deposition, sputtering, chemical vapor deposition, and lamination.

[0118] Typically, the optical article according to the invention comprises a substrate having an impact-resistant primer layer, an abrasion-resistant layer and / or a scratch-resistant layer, optional sublayers, an antireflective coating according to the invention, and a hydrophobic and / or oleophobic coating, or a hydrophilic coating providing antifogging properties, or an antifogging precursor coating.

[0119] In one embodiment, an antireflective coating and optional sublayers are applied to the front principal surface of the lens and / or the rear principal surface of the lens, preferably the front principal surface of the lens.

[0120] In another embodiment, an antireflective coating and optional sublayers are applied to the front (or back) main surface of the lens, and the back (or front) main surface of the lens is coated with an antireflective coating (which may be the same as or different from the antireflective coating on the other side), optionally with a sublayer (which may be the same as or different from the sublayer on the other side), and optionally with an impact-resistant primer coating and / or an abrasion-resistant and / or scratch-resistant coating (which may be the same as or different from those coatings on the other side). Clearly, the layers on the back side are stacked in a similar order to those on the front.

[0121] The antireflective coating of this invention is a filter for at least a portion of blue light, which works by reflecting said light. Therefore, the optical lens of this invention, provided with this reflective filter, reduces the total transmission of phototoxic blue light to the retina of the user wearing such optical lenses by at least partially blocking the transmission of phototoxic blue light.

[0122] The antireflective coating according to the invention exhibits a reflective band in the UV-blue-violet light range in order to reflect and thus suppress the transmission of high-energy visible and near-UV light, and especially harmful blue light (400-455 nm, particularly in the 420-455 nm and 420-450 nm ranges). This is particularly significant when the coating is located on the front of a lens.

[0123] Typically, the reflectivity of blue light in the 440-460 nm or 420-450 nm range can be provided to an optical lens by: a single antireflective coating according to the invention present on at least one of its main surfaces (preferably the front main surface); two identical or different antireflective coatings according to the invention present on both main surfaces of the lens; or one antireflective coating according to the invention present on one main surface and another non-inventional coating present on the other main surface. In the latter two cases, both antireflective coatings on the main surfaces of the lens contribute to reflecting harmful blue light and transmitting other wavelengths of visible light. Preferably, if different antireflective coatings are used on the two main surfaces, the reflection of blue light (R0) is enhanced. m B3 The most effective anti-reflective coating exists on the front main surface.

[0124] The antireflective coating according to the invention reflects at least partially blue light near 450 nm and thus effectively prevents the transmission of harmful blue light in the spectral range that includes the 440-460 nm range corresponding to the LED light emission of digital devices, a range typically ignored by most prior art blue light reflective filters (which are usually only effective in the 420-450 nm range).

[0125] The multilayer antireflective coating provides an average (or mean) blue light reflectance factor R in the wavelength range of 440 nm to 460 nm to at least one principal surface of the lens on which it is deposited. m B3 It applies to an angle of incidence of 15% or greater on the main surface of the filter, ranging from 0° to 15°, preferably 15°. It is defined by the following formula:

[0126] Where R(λ) represents the reflection factor at a given wavelength λ. m B3 It is defined for a specific incident angle based on R(λ) measured at the same incident angle.

[0127] The average reflection factor R as defined above m B3 Preferably, it is greater than or equal to any of the following values: 17%, 18%, 19%, 20%. Ideally, the average reflectance factor R... m B3 Less than or equal to 22% and / or in the range of 18% to 21%, preferably at an incident angle of 15°.

[0128] The filter of this invention is specifically designed to maximize the average blue light reflectance factor R. m B3 This allows for the maximization of suppression of blue light directly reaching the front surface in the wavelength range of 440 nm to 460 nm by preferably depositing a filter on the front main surface of the lens, and thus improves visual comfort and reduces eye fatigue caused by prolonged use of LED-based digital devices.

[0129] This article considers the main portion of direct light originating in front of the lens wearer and reaching the lens wearer's retina with a low incidence on the anterior principal plane, typically ranging from 0° to 15°.

[0130] Unless otherwise specified, transmittance and reflectance are averages of the light transmitted or reflected within that range, without weighting based on the eye’s sensitivity at each wavelength within that range.

[0131] The angle of incidence is classically defined as the angle between the direction perpendicular to the surface at the point of incidence and the direction in which the light beam impacts the surface.

[0132] In one aspect, the present invention aims to use the optical lenses of the present invention to prevent diseases associated with blue light-induced phototoxicity (sunlight and LED light), to reduce the risk of ophthalmic diseases due to degenerative processes associated with phototoxic blue light, or to protect at least a portion of the wearer's eye from blue light-induced phototoxicity, particularly from degenerative processes such as age-related macular degeneration (ARMD). The optical lenses described herein also advantageously provide the wearer with improved visual contrast.

[0133] The multilayer antireflective coating provides an average blue light reflectance factor R in the wavelength range of 420 nm to 450 nm for at least one principal surface of the lens on which it is deposited. m B1 It applies to incident angles greater than or equal to 15% on the main surface including the filter, ranging from 0° (normal incidence) to 15°, preferably 15°. It is defined by the following formula:

[0134] Where R(λ) represents the reflection factor at a given wavelength λ. m B1 It is defined for a specific incident angle based on R(λ) measured at the same incident angle.

[0135] The average reflection factor R as defined above m B1 Preferably, it is greater than or equal to any of the following values: 16%, 17%, 18%, 19%, 20%. Ideally, the average reflectance factor R... m B1 The range is 16% to 20.5%, preferably at an incident angle of 15°.

[0136] The filter of this invention is specifically designed to maximize the average blue light reflectance factor R. m B1 This allows for the maximization of suppression of phototoxic blue light directly reaching the front surface in the wavelength range of 420 nm to 450 nm by preferably depositing a filter on the front main surface of the lens.

[0137] In one embodiment, the multilayer antireflective coating provides an average blue light reflectance factor R in the wavelength range of 420 nm to 450 nm on at least one principal surface of the lens to which it is deposited. m B1 It is applicable to incident angles ranging from 0° to 15° that are less than or equal to 40%, 35%, 30%, 25%, 22%, or 21%. In this embodiment, R m B1The reflectance factor is maintained at a level sufficient to provide good protection against blue light, but not too high to avoid causing an undesirable yellow tint to the resulting optical lenses (i.e., an excessively high chromaticity factor b). ).

[0138] In another embodiment, the antireflective coating according to the invention has limited reflection of a portion of blue light known as chronobiological blue light (which is responsible for synchronizing the biological clock) (in the range of 465 nm to 495 nm) to allow a sufficient amount of this light to reach the wearer's eyes without disrupting their circadian rhythm.

[0139] In some cases, it may be particularly desirable to filter a relatively small portion of the blue light spectrum, specifically in the 380-450 nm region, preferably 420 nm-450 nm or 420 nm-460 nm region, while retaining the ability to transmit near the wavelength. Indeed, it has been found that blocking too much of the blue light spectrum can interfere with dark vision and mechanisms regulating circadian rhythms (known as "circadian cycles"). Therefore, in a preferred embodiment, the antireflective coating blocks less than 10%, preferably less than 5%, of the wavelength range of 465 to 495 nm. In this embodiment, the antireflective coating blocks phototoxic blue light and efficiently transmits the blue light involved in circadian rhythms. Preferably, the antireflective coating transmits at least 80%, 85%, or 90% of the wavelength range of 465 to 495 nm (for an incident angle ranging from 0° to 15° on the main surface). In another embodiment, the antireflective coating does not absorb light in the 465-495 nm range. These requirements are also preferably met by corresponding optical lenses.

[0140] In a preferred embodiment, the multilayer antireflective coating provides an average blue light reflectance factor R in the wavelength range of 465 nm to 495 nm on at least one principal surface of the lens on which it is deposited. m B2 It applies to an angle of incidence of less than or equal to 13% on the main surface including the filter, ranging from 0° to 15°, preferably 15°. It is defined by the following formula:

[0141] Where R(λ) represents the reflection factor at a given wavelength λ. m B2 It is defined for a specific incident angle based on R(λ) measured at the same incident angle.

[0142] The average reflection factor R as defined above m B2 Preferably, it is less than or equal to any of the following values: 12%, 10%, 9%, 8%, 7%.

[0143] According to this embodiment, the antireflective coating of the present invention exhibits excellent selectivity, capable of protecting against the phototoxic blue light band while maximally maintaining the circadian rhythm cycle without interfering with the chronobiological blue light band. Preferably, R m B2 Less than R m B1 More preferably, it should be at least two-thirds smaller, ideally one-half smaller.

[0144] Preferably, for an incident angle ranging from 0° to 15° on the main surface, the optical lens transmittance factor at 480 nm is greater than or equal to 70%, more preferably greater than or equal to 90%, and even more preferably greater than or equal to 95%.

[0145] The multilayer antireflective coating provides an average blue light reflectance factor R as defined above on at least one principal surface of the lens on which it is deposited. m B1 and R m B3 This makes the ratio R m B1 / R m B3 For incident angles less than or equal to 1, preferably less than 1, within the range of 0° to 15° (preferably 15°). (With R) m B3 Compared to the relatively low R m B1 This is a special characteristic of the filter of the present invention, which allows for the avoidance of obtaining an undesirable yellow tint in the resulting optical lenses. In fact, at the same level of R... m B3 Below, R m B1 / R m B3 A lower ratio indicates a lower level of yellowness.

[0146] Obviously, the ratio R m B1 / R m B3 It is for R calculated under the same incident angle. m B1 and R m B3 The reflection factor is defined.

[0147] In one embodiment, the ratio R defined above m B1 / R m B3 The value is greater than or equal to 0.8. Preferably, the contrast ratio R is satisfied for all incident angles in the range of 0° to 15°. m B1 / Rm B3 Requirements.

[0148] Since the antireflection coating of this invention is a narrowband filter that reflects blue light within the target range, it can exhibit a low average light reflectance factor R between 380 nm and 780 nm. v The "average reflectance factor" (also known as "light reflectivity", denoted as R) v The reflectance is as defined in ISO 13666:1998 and measured according to ISO 8980-4 (for an incident angle ranging from 0° to 15°, typically 15°), i.e., it is the weighted average spectral reflectance over the entire visible spectrum between 380 nm and 780 nm.

[0149] The average light reflectance factor R of the surface of a lens coated with the antireflective coating according to the present invention v For an incident angle ranging from 0° to 15°, preferably 15°, less than or equal to 2.5%, and preferably less than or equal to any of the following values: 2%, 1.9%, 1.6%, 1.4%, 1.25%, 1%, 0.9%, 0.8%.

[0150] In one embodiment, the optical article provides a combination of blue light absorption efficiency and NIR (near-infrared) radiation cutoff efficiency. Near-infrared light covers a wavelength range of 780-1400 nm.

[0151] In this embodiment, the antireflective coating further exhibits high NIR radiation reflection, thereby providing the lens with additional protection against NIR light.

[0152] The antireflective coating of this invention is configured to suppress the transmission of at least a portion of NIR radiation by reflection. Therefore, it is referred to as an "NIR cutoff filter" and can be used for protective purposes. By reflecting light in the wavelength range corresponding to NIR radiation, potentially harmful light will not reach the wearer's eyes. This is particularly relevant to NIR radiation in the range of 780 nm to 1400 nm (which is considered harmful to the retina).

[0153] Therefore, the optical article of the present invention, which is provided with such a reflective filter, reduces the total harmful NIR transmission to the retina of the user wearing such an optical article by at least partially blocking the transmission of phototoxic blue light.

[0154] The antireflective coating according to this embodiment of the invention exhibits a reflection band in the NIR range. This is particularly significant when the coating is located on the front of a lens.

[0155] In this embodiment, the multilayer antireflective coating provides an average reflectance factor R in the near-infrared region within the wavelength range of 780 nm to 1400 nm on at least one main surface of the lens to which it is deposited. m NIR Its incident angle on the surface, ranging from 0° (normal incidence) to 15°, preferably 15°, is greater than or equal to 10% or 15%, wherein R m NIR Defined by the following formula, where R(λ) represents the reflection factor at wavelength λ:

[0156] R m NIR It is defined for a specific incident angle based on R(λ) measured at the same incident angle, and is preferably less than or equal to 20% or less than or equal to 16%.

[0157] The protection against phototoxic blue light provided by the optical lens of this invention can be quantified by a blue-violet light protection factor (BVC, blue-violet cutoff) in the wavelength range of 400-455 nm, which is based on a transmission factor weighted by the photohazard function B'(λ). This factor is defined by the following relationship:

[0158] Where T(λ) represents the lens transmittance factor at a given wavelength λ, measured at an incident angle ranging from 0° to 45°, preferably at 0°, and the weighting function B'(λ) represents the light hazard function (relative spectral function efficiency) at a given wavelength λ, as shown in Figure 1 of the applicant's publication WO 2017 / 077359. This light hazard function is the result of a collaboration between the Paris Vision Institute and Essilor International. As can be seen from this figure, blue light is most dangerous to the human eye around 430 nm. The values ​​of the B'(λ) function between 400 and 455 nm are given below at a spacing of 5 nm:

[0159] In a preferred embodiment of the invention, for an incident angle ranging from 0° to 45°, preferably 0°, and more preferably for incident angles of 0°, 15°, 30° and 45°, and even better for all incident angles from 0° to 45°, the BVC is greater than or equal to 20%, preferably greater than or equal to 25%, 30%, 34% or 35%.

[0160] In this specification, unless otherwise specified, transmittance is measured at the center of an optical article with a thickness ranging from 0.5 mm to 2.5 mm, preferably 2 mm, at an angle of incidence ranging from 0° to 15°, preferably 0°.

[0161] In one embodiment, the optical lens of the present invention has an average blue light transmittance factor T in the wavelength range of 420 nm to 450 nm. m B1 For incident angles ranging from 0° to 15° (preferably 0°) greater than or equal to 60%, 65%, or 70%, where T m B1 Defined by the following formula, where T(λ) represents the lens transmittance factor at a given wavelength λ:

[0162] Average blue light transmittance factor T m B1 All methods of blocking light between 420 and 450 nm were considered, namely both absorption and reflection filters. Higher T is required. m B1 Factors are used to minimize the yellowness of optical lenses.

[0163] In one embodiment, the optical lens of the present invention has an average blue light transmittance factor T in the wavelength range of 465 nm to 495 nm. m B2 For incident angles ranging from 0° to 15° (preferably 0°) greater than or equal to 80%, 85%, 87%, 90%, 92%, or 94%, where T m B2 Defined by the following formula, where T(λ) represents the transmittance factor of the optical artifact at a given wavelength λ:

[0164] Higher T is needed m B2 Factors are used to maximize the transmittance of optical products to time-biological blue light.

[0165] In one embodiment, the optical lens of the present invention has an average blue light transmittance factor T in the wavelength range of 440 nm to 460 nm. m B3 For incident angles ranging from 0° to 15° (preferably 0°) less than or equal to 85%, 80%, or 79%, where T m B3 Defined by the following formula, where T(λ) represents the lens transmittance factor at a given wavelength λ:

[0166] Requires a lower T m B3 Factors are used to maximize protection against LED blue light.

[0167] In one embodiment, the optical article according to the invention absorbs little or no light in the visible spectrum, which, in the context of this application, means that its relative transmittance factor Tv in the visible spectrum is greater than or equal to any of the following values: 87%, 88%, 89%, 90%, 92%, 94%, 95%, 96%. The Tv factor preferably ranges from 87% to 98.5%, more preferably from 87% to 97%, and even more preferably from 90% to 96.5%. In another embodiment, the Tv ranges from 89% to 98%, preferably from 90% to 98%, and more preferably from 94% to 97%.

[0168] The TV factor (also known as the system's "light transmittance") is defined as in ISO standard 13666:1998 and measured according to standard ISO 8980-3. It is defined as the average value over the wavelength range of 380–780 nm, weighted according to the sensitivity of the eye at each wavelength in this range, and measured under D65 illumination conditions (daylight).

[0169] In this application, for a given angle of incidence on a surface including the filter, the spectral reflectance of an optical lens represents the variation of reflectance (i.e., the reflectance factor) at that angle of incidence depending on the wavelength. The reflectance curve / spectrum corresponds to a schematic diagram of reflectance, where reflectance is plotted on the ordinate and wavelength on the abscissa. Reflectance can be measured using a spectrophotometer, such as the Perkin Elmer Lambda 850 spectrophotometer with a URA (Universal Reflectance Accessory), which provides a reflectance spectrum.

[0170] According to the present invention, the multilayer antireflection coating has a reflection peak for a spectral reflectance curve with an incident angle ranging from 0° to 15°, preferably 15°, the reflection peak being centered at a wavelength greater than or equal to 435 nm and less than or equal to 450 nm.

[0171] The reflection peak is preferably centered at a wavelength greater than or equal to 437 nm or 429 nm. Alternatively, the reflection peak may be centered at a wavelength less than or equal to 449 nm or 447 nm.

[0172] As defined by the filter of the present invention, the reflection peak extends at least in the range of 440-460 nm.

[0173] Preferably, the multilayer antireflective coating exhibits maximum reflectance at wavelengths greater than or equal to 435 nm and less than or equal to 450 nm for an incident angle ranging from 0° to 15°. Preferably, the maximum reflectance is at wavelengths greater than or equal to 437 nm or 429 nm. Preferably, the maximum reflectance is at wavelengths less than or equal to 449 nm or 447 nm.

[0174] As used in this article, having a reflection peak within a wavelength range means that the maximum value of the peak falls within this range.

[0175] As can be seen in Figures 1 to 3, the spectral reflectance curve of the lens of the present invention is generally “bell-shaped” in the wavelength range of 380 nm to 530 nm, which can be characterized by its height (maximum reflectance) and its full width at half maximum (FWHM).

[0176] According to the present invention, the reflection peak defined above exhibits a full width at half maximum (FWHM) of less than or equal to 90 nm, preferably less than or equal to 80 nm. The FWHM of the reflection peak is preferably greater than or equal to 40 nm, and preferably ranges from 45 nm to 80 nm.

[0177] Full width at half maximum (FWHM) is a well-known measure of filter bandwidth. It is defined as λhigh - λlow, where λhigh and λlow occur on either side of the reflection peak wavelength, and the reflection is (maximum peak reflection - baseline reflection) / 2. The maximum reflection of the filter defines the center of the filter band.

[0178] Considering its low full width at half maximum (FWHM) of the reflection peak centered in the 435-450 nm range (≤ 90 nm), the antireflection filter of the present invention, combined with a lens substrate, is preferably a narrow-band filter in the 400-510 nm range and preferably a high-pass filter above 510 nm. The high-pass filter attenuates the transmission of light wavelengths below the cutoff wavelength, thereby allowing higher wavelengths of light to pass through the filter.

[0179] According to the present invention, the reflection peak as defined above has a maximum reflectance of less than or equal to 30%, preferably less than or equal to 27%, 26%, 25%, or 23%. This feature allows for a good lens aesthetic appearance combined with a high level of retinal protection against harmful blue light. For a similar overall level of blue light protection, if the maximum reflectance of the reflection peak is too high, the protection against LED light emission from digital devices is reduced, while the yellow level of the lens increases and the average reflectance in the visible light range increases.

[0180] According to the present invention, the multilayer antireflection coating exhibits a local minimum of reflectance in the spectral reflectance curve for an incident angle ranging from 0° to 15°, located in the wavelength range of 380 nm to 420 nm. This local minimum of reflectance is less than or equal to any one of the following values: 2%, 1.5%, 1%, 0.9%, 0.6%, 0.4%, 0.2%, and 0.1%. This characteristic helps to reduce the rising side of the reflection peak as defined above (the left side of the reflection peak below the wavelength of maximum reflectance), and thus allows for the reduction of R... m B1 The factor (measured in the 420-450 nm range) simultaneously maintains the same high level of R. m B3 Factors to reduce R m B1 / R m B3 The ratio, thus reducing the yellowness of the optical lens.

[0181] As is well known, a local minimum (minimum inflection point) on a smooth plane curve is the point where the derivative of the function changes from negative to positive. At this point on the curve, the derivative (slope) of the function is zero, that is, the tangent line is horizontal.

[0182] A local minimum is not necessarily the global (absolute) minimum of a function. It can also be a relative minimum within a range. In the case of this invention, the reflection curve can have a local minimum that is the global minimum, or several local minimums at different wavelengths.

[0183] In the spectral reflectance curve of the present invention, the local minimum reflectance exists at wavelengths ranging from 380 nm to 420 nm, preferably from 385 nm to 415 nm or from 389 nm to 411 nm.

[0184] In some embodiments, the optical lens includes at least one absorptive filtering means that supplements the protection provided by the antireflective coating of the present invention by absorbing at least partially blocking the transmission of blue light in the wavelength range of 420 to 460 nm. In this specification, unless otherwise specified, light blocking is defined with reference to an angle of incidence ranging from 0° to 15°, preferably 15°.

[0185] In one embodiment, the substrate of the optical lens includes at least one blue light blocker that at least partially blocks light in the wavelength range of 400 to 455 or 460 nm, the blue light blocker being selected from UV absorbers and blue light absorbing colorants. As used herein, an absorbing colorant can refer to both pigments and dyes, i.e., either insoluble in its carrier or soluble in its carrier, respectively.

[0186] Examples of absorbing dyes that can be used as filters in the phototoxic spectral range are described in WO 2013 / 084177 or WO 2018 / 054988. Among these absorbing dyes, dyes related to porphyrins are preferred. A preferred absorbing dye is ABS420™ supplied by Exciton.

[0187] Examples of UV absorbers that at least partially block incident light in the wavelength range of 400 to 460 nm are mentioned in WO 2019 / 211242 and WO 2020 / 120540.

[0188] Preferred absorptive filters have a narrow absorption band in the 420-450 nm range of the electromagnetic spectrum. Ideally, the absorption band is centered around 420-430 nm. They preferably do not absorb or absorb very little (typically less than 5%, preferably less than 4%, more preferably less than 3%) in the visible spectral region outside the 410-450 nm wavelength range.

[0189] Taking into account the standard light source D65 and the observer, in transmission (for b) ) or reflection (for C) In (and h), for light with an incident angle of 15º (unless otherwise specified), the antireflection stack of the present invention (C) is calculated between 380 and 780 nm. (h) and optical products (b) In the international colorimetric CIE L a b The colorimetric coefficients in the CIE L (International Colorimetric System). The observer is as follows: a b The "standard observer" (10°) as defined in the document.

[0190] From the perspective of wearer comfort, the optical lens according to the present invention preferably has a sensitivity of less than or equal to 90, 85, 80 or 70 for light with an incident angle of 15°, as described in CIE (1976) L. a b The colorimetric C defined in the International Colorimetric System (In reflection).

[0191] The hue angle (h) of the antireflective coating is related to the residual color (the color of the reflected light) displayed by the antireflective coating, and preferably ranges from 240° to 325°, more preferably from 290° to 310°, for light with an incident angle of 15°, thus making the residual reflected color perceived as blue to purple.

[0192] The optical lens according to the invention preferably has a value in the range of 10 to 25, more preferably 10 to 20, more preferably 11 to 15, and generally greater than or equal to 0, as in CIE (1976) L. a b The colorimetric coefficient b defined in the International Colorimetric System (In transmission). The low chromaticity coefficient b of optical products. This may be related to its limited or non-yellow appearance (transmittance color). In fact, b Positive values ​​on the axis indicate the amount in yellow, while negative values ​​indicate the amount in blue.

[0193] The present invention further relates to a method for manufacturing an optical lens as described above, the method comprising:

[0194] - Provides optical lenses comprising a substrate having a front main surface and a rear main surface.

[0195] - Deposit in this sequence on at least one main surface of the substrate: a single sublayer optionally having an exposed surface and a thickness greater than or equal to 120 nm, and a multilayer antireflective coating comprising at least one high refractive index layer with a refractive index greater than 1.55 and at least one low refractive index layer with a refractive index of 1.55 or less (refractive index is expressed relative to a wavelength of 550 nm), thereby obtaining a coated optical article.

[0196] The multilayer antireflective coating provides the at least one main surface with an average light reflectance factor R of 380 nm to 780 nm as defined in ISO 13666:1998. v Its incident angle is less than or equal to 2.5% in the range of 0° to 15°; and its average blue light reflectance factor R in the wavelength range of 420 nm to 450 nm is... m B1 Its average blue light reflectance factor R is greater than or equal to 15% for incident angles in the range of 0° to 15°; and in the wavelength range of 440 nm to 460 nm. m B3 It applies to incident angles greater than or equal to 15% within the range of 0° to 15°; and the ratio R m B1 / R m B3The multilayer antireflection coating has the following spectral reflectance curves for incident angles in the range of 0° to 15°: a reflection peak centered at a wavelength greater than or equal to 435 nm and less than or equal to 450 nm, having a maximum reflectance of less than or equal to 30% and a full width at half maximum (FWHM) of less than or equal to 90 nm; and a local minimum reflectance in the wavelength range of 380 nm to 420 nm, which is less than or equal to 2%.

[0197] In one embodiment, the optical lens of the present invention is prepared by forming a primer coating and / or an abrasion-resistant coating and / or a scratch-resistant coating on a substrate in a first manufacturing location and forming other coatings in a second manufacturing location.

[0198] The following examples illustrate the invention in more detail, but not in a limiting manner. Unless otherwise stated, all thicknesses disclosed herein refer to physical thicknesses. Unless otherwise specified, refractive indices mentioned herein are expressed at 20°C–25°C for a wavelength of 550 nm.

[0199] The preferred angle of incidence for each optical parameter is 15°. A study analyzing the light incidence range of ophthalmic lens wearers under typical screen usage conditions showed that 68% of the light emitted from screens / digital devices reaches the lens within the angle of incidence range [10°–30°], and 95% of the light occurs at an angle of incidence below 36°. Therefore, a 15° angle of incidence is a relevant consideration for light emitted from screen devices. Example 1. General Procedure

[0200] The products used in the examples include: MR8 polysulfide with a diameter of 65 mm. ® The lens substrate (from Mitsui Toya Chemical Co., Ltd., refractive index = 1.6), with a power of -2.00 diopter and a thickness of 1.2 mm, is coated on its convex main surface with an impact-resistant primer coating disclosed in the experimental section of WO 2010 / 109154 (modified to have a refractive index of 1.6 by adding a high refractive index colloid) and an abrasion-resistant and scratch-resistant coating (hard coating) disclosed in Example 3 of EP 0614957 (modified to have a refractive index of 1.6 instead of 1.5 by adding a high refractive index colloid); a multilayer filtering antireflective coating according to the present invention; and an antifouling coating disclosed in the experimental section of patent application WO 2010 / 109154, which is achieved by using Optool DSX sold by Daikin Industries, Ltd. ® The compound was obtained by vapor deposition (thickness: 2 to 5 nm) under vacuum.

[0201] Different dielectric layers are deposited without heating the substrate by vacuum evaporation.

[0202] The vacuum evaporation apparatus that enables the deposition of different antireflection layers is the BAK vacuum coater from Physimeca, which has two systems for evaporating materials: an electron gun evaporation system and a thermal evaporator (Joule effect evaporation system), as well as a Mark 2+ ion gun from Veeco for use in the preparatory stage of preparing the substrate surface by argon ion bombardment (IPC). 2. Preparation of optical products

[0203] The lens is placed on a rotary table with circular openings designed to accommodate the lens to be processed, with the concave side facing the vapor deposition source and ion gun.

[0204] Methods for producing optical products include introducing a lens substrate with a primer and abrasion-resistant coating into a vacuum deposition chamber, performing a evacuation step until a high vacuum is generated, and then applying the same processing conditions as in WO 2020 / 104392 to successively deposit the required number of layers (anti-reflective coating, anti-fouling coating, etc.).

[0205] Examples 1 to 8, Comparison 1 (C1), and Comparison 2 (C2) differ from Examples 1A to 8A, Comparison 1A (C1A), and Comparison 2A (C2A) in that they have the same impact-resistant primer coating and abrasion-resistant and scratch-resistant coating deposited on the concave (back) surface of the lens as on the convex (front) surface, and an anti-reflective coating with low reflectivity in the UV range made of the following stack, which is designed to have the following properties (the reflectivity Ruv is defined in application WO 2012 / 076714): 3. Testing Methods

[0206] The optical articles prepared according to the present invention were evaluated using the following testing procedure. Several samples were prepared for each system for measurement, and the reported data were calculated as the average of the different samples.

[0207] Transmission curves of lenses coated with the stacked bodies of the present invention were recorded at 1 nm intervals on a Cary 60 spectrophotometer from Agilent Technologies. Taking into account a standard illuminant D65 and a standard observer angle of 10°, the results were obtained in accordance with the International Colorimetric Society (CIE) standard. a b The hue angle h and chromaticity C of a lens measured in transmission space. and b The chromaticity components were analyzed. Transmission characteristics (including BVC, T) were also analyzed. mB1 and T m B3 The value was measured at an incident angle of 0°.

[0208] The reflection curves of lenses coated with the stacked bodies of this invention were recorded at 1 nm intervals on an UltraScan PRO from Hunter Lab. Taking into account a standard light source D65 and a standard observer angle of 10°, the results were obtained in accordance with the International Colorimetric Society (CIE) standard. a b The hue angle h and chromaticity C of the lens measured during reflection in space. The chromaticity components were analyzed. Reflectance properties (including R...) v R m B1 R m B2 R m B3 R m NIR The FWHM, maximum reflectance, and minimum reflectance are calculated from the same measurement results for a 15° incident angle in reflection. 4. Results

[0209] The structural features and optical properties of the ophthalmic lenses obtained in the examples are described in detail below.

[0210] Comparative Examples 1 and 3 present antireflective coatings prepared according to the teachings of WO 2013 / 171434. Comparative Example 2 presents an antireflective coating prepared according to the teachings of WO 2022 / 258793. Table 1: Reflective properties of the prepared lenses. Table 2: Transmission characteristics of the prepared lenses. C in this table h represents transmittance data.

[0211] The reflectance spectra of different coatings are shown in Figures 1 to 3, and the transmission spectra of different lenses are shown in Figures 4 to 6. The antireflection coating according to the invention has a low average reflectance factor R in the visible light range. v This results in high transparency. Furthermore, due to the high reflection peak in the 435-450 nm range, these coatings also exhibit high R0. mB1 (≥ 17%), R m B3 (≥ 20%) Reflectance factor and Blue-violet Protection Factor (BVC), which indicate effective protection against phototoxic blue light, and especially against blue light emission from LEDs in digital devices, without compromising antireflective properties in the visible light region.

[0212] Their T m B3 The factor is much smaller than those in WO 2013 / 171434 (compare examples 1 and 3), which indicates a higher level of protection against blue light emissions from LEDs in digital devices.

[0213] Therefore, the ophthalmic lens of the present invention can prevent the wearer's eyes from degenerative processes such as age-related macular degeneration caused by blue light-induced phototoxicity.

[0214] The R of the coating of the present invention m B2 Low, which is desirable in chronobiology.

[0215] In contrast to the comparative filters that are broadband filters, all the filters of the present invention are narrowband filters that exhibit reflection of light in a specific wavelength range, wherein the reflection peak is centered at 435-450 nm and has an FWHM of less than 80 nm.

[0216] The optical lens of the present invention has a much lower R value than the lens of Comparative Example 2. m B1 / R m B3 The ratio, which indicates the ratio of the resulting optical lenses in similar R... m B3 The trend of not wanting yellow is lower at the horizontal level.

[0217] The optical lenses of this invention have a lower chromaticity coefficient b than those in WO 2022 / 258793 (Comparative Example 2). This indicates a lighter yellow appearance, which is aesthetically more pleasing to the user. They also have a lower reflectance chromaticity C than those in WO 2022 / 258793. This results in weaker reflected color intensity, thus improving the aesthetics of the lens.

[0218] Furthermore, almost all lenses according to the present invention have a higher R value than the contrast lens. T1 The ratio is higher, and therefore it has higher thermal and mechanical properties.

Claims

1. An optical lens, comprising: - A substrate having a front main surface and a rear main surface, and - a multilayer antireflective coating disposed on at least one of the main surfaces and comprising a stack of at least one layer with a refractive index greater than 1.55 and at least one layer with a refractive index of 1.55 or less, the refractive index being expressed for a wavelength of 550 nm, the multilayer antireflective coating having the following spectral reflectance profile for an incident angle in the range of 0° to 15°: - a reflection peak centered at a wavelength greater than or equal to 435 nm and less than or equal to 450 nm and having a maximum reflectance of less than or equal to 30% and a full width at half maximum (FWHM) of less than or equal to 90 nm, and - a local minimum of reflectance in the wavelength range of 380 nm to 420 nm, the local minimum of reflectance being less than or equal to 2%, the multilayer antireflective coating providing the at least one main surface with the following characteristics: - an average light reflectance factor R from 380 nm to 780 nm as defined in ISO 13666:1998. v Its average blue light reflectance factor R is less than or equal to 2.5% for incident angles in the range of 0° to 15°, and in the wavelength range of 420 nm to 450 nm. m B1 Its average blue light reflectance factor R is greater than or equal to 15% for incident angles in the range of 0° to 15°, and in the wavelength range of 440 nm to 460 nm. m B3 It applies to incident angles greater than or equal to 15% within the range of 0° to 15°, and - ratio R m B1 / R m B3 It applies to incident angles less than or equal to 1 within the range of 0° to 15°.

2. The optical lens according to claim 1, wherein, The multilayer antireflective coating provides the at least one primary surface with an average blue light reflectance factor R in the wavelength range of 465 nm to 495 nm. m B2 It applies to incident angles less than or equal to 13% in the range of 0° to 15°.

3. The optical lens according to any one of the preceding claims, wherein, The ratio R m B1 / R m B3 Greater than or equal to 0.

8.

4. The optical lens according to any one of the preceding claims, wherein, The multilayer antireflective coating comprises 14 layers or less, preferably 4 to 12, and more preferably 7 to 11 layers.

5. The optical lens according to any one of the preceding claims, wherein, The multilayer antireflective coating has a total thickness of less than or equal to 1 µm, preferably ranging from 200 nm to 700 nm, more preferably from 250 nm to 560 nm.

6. The optical lens according to any one of the preceding claims, wherein, The substrate contains at least one blue light blocker that at least partially blocks light in the wavelength range of 400 to 455 nm, the blue light blocker being selected from UV absorbers and blue light absorbing colorants.

7. The optical lens according to any one of the preceding claims, wherein, The local minimum reflectance is located in the wavelength range of 385 nm to 415 nm.

8. The optical lens according to any one of the preceding claims, wherein, The local minimum reflectance is less than or equal to 1.5%, preferably less than or equal to 1%.

9. The optical lens according to any one of the preceding claims, wherein, The maximum reflectivity of the reflection peak is less than or equal to 25%.

10. The optical lens according to any one of the preceding claims, wherein, The multilayer antireflective coating provides the at least one primary surface with an average reflectance factor R in the near-infrared region within the wavelength range of 780 nm to 1400 nm. m NIR It is applicable to incident angles ranging from 0° to 15° that are less than or equal to 20%, preferably less than or equal to 16%, where R m NIR Defined by the following formula, where R(λ) represents the reflection factor at wavelength λ: 。 11. The optical lens according to any one of the preceding claims, wherein, The full width at half maximum (FWHM) of the reflection peak is greater than or equal to 40 nm, and preferably ranges from 45 nm to 80 nm.

12. The optical lens according to any one of the preceding claims, wherein, The multilayer antireflective coating has a ratio R greater than or equal to 1.

45. T1 : 。 13. The optical lens according to any one of the preceding claims, wherein, The average blue light reflectance R in the wavelength range of 420 nm to 450 nm m B1 Less than or equal to 21%, and preferably in the range of 16% to 20.5%.

14. The optical lens according to any one of the preceding claims, wherein, The average blue light reflectance R in the wavelength range of 440 nm to 460 nm m B3 Less than or equal to 22%, and preferably in the range of 18% to 21%.

15. The optical lens according to any one of the preceding claims, wherein, The average light reflectance factor R v Less than or equal to 1.6%, more preferably less than or equal to 1%.

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