CN118613754A

CN118613754A - Glasses lens

Info

Publication number: CN118613754A
Application number: CN202380018830.4A
Authority: CN
Inventors: 二见贤吾; 金田大辅; 今田隆一
Original assignee: Jingzi Holding Co
Current assignee: Jingzi Holding Co
Priority date: 2022-01-28
Filing date: 2023-01-26
Publication date: 2024-09-06
Also published as: JPWO2023145836A1; TW202346976A; TWI836881B; WO2023145836A1

Abstract

The invention provides a lens for spectacles, which comprises a substrate layer and a coating film layer coated on at least one surface of the substrate layer, wherein the total average transmittance of the substrate layer and the coating film layer is more than 60% in a wavelength region of more than 360nm and less than 380 nm.

Description

Glasses lens

Technical Field

The present invention relates to a lens for spectacles.

Background

Among conventional spectacle lenses, there are ones that use a material that blocks ultraviolet light (see, for example, patent document 1), and ones that do not transmit ultraviolet light (see, for example, patent document 2). On the other hand, in particular, for children, there is a literature that sunlight has a good effect on physical and mental development, and that when the sunlight is not sufficiently bathed, there is an increased risk of myopia in children (for example, see non-patent literature 1).

Patent literature

Patent document 1: japanese patent laid-open No. 2009-209120

Patent document 2: international publication No. 2019/188447

Non-patent literature

Non-patent document 1: japanese society of ophthalmology and other 5 society, "cautiously opinion about wearing blue-ray-proof glasses for children", day 14 of 2021, day 14 of 4, day 27 of 2022, search, website < https:// www.gankaikai.or.jp/info/20210414_blue light:.pdf >

Disclosure of Invention

Here, in order for a user wearing the glasses to transmit natural light including ultraviolet rays to the eyes, the glasses must be removed, and the effect of vision correction achieved by the glasses cannot be obtained.

In order to solve the above problems, a substrate for forming a spectacle lens using a compound that transmits ultraviolet rays is considered, but in order to satisfy the resistance conditions and the like as a spectacle lens, a coating film is generally applied to the substrate. In the spectacle lens having such a general structure, there is a new demand for transmitting natural light to the eye as much as possible, considering the total characteristics of the base material and the coating film: the ultraviolet rays blocked up to now are transmitted.

Accordingly, an object of the present invention is to provide a spectacle lens which transmits ultraviolet rays as much as possible and which is brought closer to a state when natural light is bathed with the naked eye.

In one embodiment, the eyeglass lens of the present invention comprises a base material layer and a coating film layer coated on at least one surface of the base material layer, wherein the total average transmittance of the base material layer and the coating film layer is 60% or more in a wavelength region of 360nm or more and less than 380 nm.

According to the present invention, a spectacle lens that transmits ultraviolet rays as much as possible can be provided.

Drawings

Fig. 1 is a graph showing the light transmittance (LIGHT TRANSMITTANCE) of each eyeglass lens according to the prior art.

Fig. 2 is a view showing an example of the light transmittance of the base material a according to the first embodiment.

Fig. 3 is a view showing an example of the light transmittance of the base material B according to the first embodiment.

Fig. 4 is a view showing an example of the light transmittance of the base material C according to the first embodiment.

Fig. 5 is a view showing an example of the light transmittance of the alternative substrate according to the second embodiment.

Fig. 6 is a view showing an example of light transmittance in the case where an ultraviolet-visible light AR coating layer that prevents reflection of ultraviolet light and visible light is applied to both sides of the resins 1 to 10 according to the second embodiment.

Fig. 7 is a graph showing a table comparing average transmittance in the case where each coating film layer is applied to the resins 1,3, and 6 according to the second embodiment.

Fig. 8 is a graph comparing transmittance of resins 1, 3, and 6 with that of the conventional lenses.

Fig. 9 is a graph showing a table comparing transmittance in each region of resins 1, 3, 6 and the conventional lenses.

Fig. 10 is a graph showing a table a comparing transmittance in each region of resins 1, 3, 6.

Fig. 11 is a graph showing a table B comparing transmittance in each region of resins 1, 3, 6.

Fig. 12 is a graph showing the reflectance of each antireflection film for the resin 6.

Fig. 13 is a graph showing transmittance caused by difference of AR coating layers on respective sides of the resin 3.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below are merely examples, and are not intended to exclude applications of various modifications and techniques not explicitly described below. That is, the present invention can be variously modified and implemented within a range not deviating from the gist thereof. In the description of the drawings below, the same or similar parts are denoted by the same or similar symbols. The drawings are schematic and do not necessarily correspond to actual dimensions, proportions, etc. The drawings may include portions having different dimensional relationships and proportions.

First embodiment

< Conventional spectacle lens >

Fig. 1 is a graph showing light transmittance of each lens for glasses according to the prior art (the lenses for glasses according to the prior art are also collectively referred to as "conventional lenses"). In the example shown in fig. 1, the following 4 lenses are used to measure light transmittance.

Lens a: lenses (refractive index 1.50) having CR-39 (registered trademark) (allyl diglycol dicarbonate (allyl diglycol carbonate)) manufactured by PPG company (PPG Industries, inc.) as a base material

Lens B: lens of thiourethane (thiourethane) series (refractive index 1.60)

Lens C: thiourethane lens (refractive index 1.67)

Lens D: thiourethane lens (refractive index 1.74)

The lenses a to D each have a hard coating layer and an antireflection coating layer formed on both surfaces of a base material. Furthermore, as shown in FIG. 1, each of lenses A-D blocks wavelengths shorter than 380 nm. From these results, it was found that at least one treatment of including an ultraviolet absorber in the base material, including an ultraviolet absorber in the hard coat layer, and including an ultraviolet absorber in the antireflection coating layer was performed on each of the lenses a to D.

Thus, not only lenses for vision correction, but also in most existing lenses, the absorption wavelengths of the lenses are slightly different due to the difference in lens manufacturers and materials, but all lenses block wavelengths shorter than 380 nm.

Accordingly, the present inventors have developed a concept of transmitting ultraviolet rays in lenses for spectacles in view of the effect of ultraviolet rays on eyes and the like which have been ascertained in recent years. However, as shown in fig. 1, in the conventional eyeglass lenses, ultraviolet rays are often blocked, and there are no lenses desired by the inventors of the present invention.

< Substrate in spectacle lens of the present invention >

First, a substrate in a spectacle lens according to a first embodiment of the present invention will be described. In the eyeglass lens according to the first embodiment, the base material using the ultraviolet-absorbing material as the main material is not used. For example, an aromatic compound, an aliphatic compound having a conjugated structure, or the like is known as a material for absorbing ultraviolet rays, and therefore, in the first embodiment, a base material using these compounds as a main material is not used as a lens for spectacles.

The spectacle lens according to the first embodiment includes a base layer containing, as a main material, a1 st compound other than a compound that absorbs ultraviolet light by a predetermined percentage or more. The material that absorbs ultraviolet rays at a predetermined percentage or more includes, as an example, the above aromatic compound. The base material layer may contain an aromatic compound within a range that does not interfere with the purpose of the first embodiment or the like.

Thus, since the base material layer is formed using the 1 st compound other than the compound that absorbs ultraviolet light by a predetermined percentage or more, at least the base material layer of the spectacle lens can be prevented from seriously blocking the transmission of ultraviolet light. Therefore, the ultraviolet rays pass through the eyeglass lenses, so that light similar to natural light including the ultraviolet rays is transmitted to the eyes.

In the first embodiment, ultraviolet light means a wavelength in a wavelength range of, for example, 280 to 400 nm. Among them, 320 to 400nm is called UVA (wavelength region 1), and 280 to 320nm is called UVB (wavelength region 2). The boundary between UVA and UVB may be set to 315nm and the upper limit of UVA may be set to 380nm. In the eyeglass lens of the first embodiment, the lens is formed so as not to block and transmit a wavelength of 280 to 400 nm.

The 1 st compound used for forming the base material layer is, for example, a compound other than an aromatic compound, and includes at least one of an aliphatic polycarbonate, an aliphatic olefin polymer, an aliphatic acrylic resin, and an aliphatic nylon resin.

The substrate formed of the aliphatic polycarbonate includes, for example, at least one of CR-39 (registered trademark) manufactured by PPG company, and DURABIO (registered trademark) manufactured by mitsubishi company. CR-39 (registered trademark) is a linear aliphatic polycarbonate having no aromatic ring, and therefore has a weak function of absorbing ultraviolet rays. Also DURABIO (registered trademark) is a polycarbonate which is a part of a biomaterial using isosorbide as a biomaterial. In this compound, the diol copolymerized with isosorbide is also alicyclic and does not have an aromatic ring, and thus the ultraviolet light absorbing function is considered to be weak.

The aliphatic olefin polymer includes, for example, at least one of a cyclic olefin polymer (alicyclic olefin polymer), an aliphatic olefin polymer having no cyclic structure, and the like. The base material formed using the cycloolefin polymer includes, for example, any one of APEL (registered trademark) manufactured by mitsunin chemical company (refractive index 1.544, abbe number 56), ZEONEX (registered trademark) manufactured by zeonen corporation (refractive index 1.509 to 1.535), and ARTON (registered trademark) manufactured by JSR corporation (refractive index 1.513 to 1.516, abbe number 56 or 57).

The base material formed of an aliphatic olefin polymer having no cyclic structure contains, for example, TPX (registered trademark) (compound name is polymethylpentene) (refractive index 1.46) manufactured by the trade name of tsu chemical company.

As a substrate made of an aliphatic acrylic resin, as an example, an "ultraviolet transmitting PMMA lens" (refractive index of about 1.49, abbe number 55) manufactured by japan special optical resin company, or the like can be used. PMMA is short for polymethyl methacrylate. The ultraviolet-transmitting PMMA is an acrylic resin that transmits ultraviolet rays.

Here, the light transmittance of the substrates a to C will be described with reference to fig. 2 to 4. First, as described above, in the eyeglass lens of the first embodiment, light rays in the wavelength range of 280 to 400nm are transmitted as much as possible.

Fig. 2 is a view showing an example of the light transmittance of the base material a according to the first embodiment. The substrate a was formed of a resin using a cycloolefin polymer, and the refractive index was 1.544. In the wavelength region of 300 to 400nm, the substrate a transmits a wavelength in the ultraviolet region more than the conventional spectacle lens shown in fig. 1. In the example shown in fig. 2, the substrate a has a transmittance of about 15% in the vicinity of a wavelength of 300 nm. Further, the light transmittance in the 1 st wavelength region (320 to 400 nm) was about 60% on average.

Fig. 3 is a view showing an example of the light transmittance of the base material B according to the first embodiment. The substrate B was formed of a resin using a cycloolefin polymer, and the refractive index was 1.51. In the wavelength region of 280 to 400nm, the substrate B transmits a wavelength in the ultraviolet region more than the conventional spectacle lens shown in fig. 1. In the example shown in fig. 3, the transmittance of the substrate B rapidly increases from the vicinity of the wavelength of 280nm, and the transmittance in the 2 nd wavelength region (280 to 320 nm) is about 35% on average. Further, in the 1 st wavelength region (320 to 400 nm), there is a transmittance of about 85% on average.

Fig. 4 is a view showing an example of the light transmittance of the base material C according to the first embodiment. The base material C was formed of a resin using PMMA that transmits ultraviolet rays, and had a refractive index of 1.49 and an abbe number of 55. In the wavelength region of 280 to 400nm, the substrate C transmits a wavelength in the ultraviolet region more than the conventional spectacle lens shown in fig. 1. In the example shown in fig. 4, the substrate C has a transmittance of about 55% on average in the 2 nd wavelength region (280 to 320 nm). Further, in the 1 st wavelength region (320 to 400 nm), there is a transmittance of about 90% on average.

In the examples shown in fig. 2 to 4, the substrate C transmits light having a wavelength of 280 to 400nm in the ultraviolet region, and thus the substrate C can be used favorably as a substrate layer for a spectacle lens. Even the base material A, B is capable of transmitting a wavelength in the ultraviolet region more than the conventional base material layer of the spectacle lens, and therefore can be used as a base material of the spectacle lens.

< Coating >

The spectacle lens may have a hard coat layer (also referred to as "hard coat layer", "hard coat layer" or "hard coat layer") formed on at least one surface of the base material layer. The eyeglass lens in the first embodiment may include a hard coat film layer formed of a material containing no ultraviolet absorber, which is coated on at least one surface of the base material layer. The hard coat layer may be formed by uniformly applying a hard coat liquid to the surface of the base material layer, for example, and a resin containing no aromatic compound may be used.

For example, in a spectacle lens, an organosiloxane resin containing inorganic oxide fine particles can be preferably used as the hard coat layer. The organosiloxane resin is preferably obtained by hydrolyzing and condensing an alkoxysilane. Further, as specific examples of the organosiloxane-based resin, γ -glycidoxypropyl trimethoxysilane, γ -glycidoxypropyl triethoxysilane, methyltrimethoxysilane, ethyl silicate, or a combination thereof is included. The hydrolysis condensate of an alkoxysilane is produced by hydrolyzing the alkoxysilane compound or a combination thereof in an acidic aqueous solution such as hydrochloric acid.

Examples of the material of the inorganic oxide fine particles include zinc oxide, silicon dioxide (silicon oxide fine particles), aluminum oxide, titanium oxide (titanium oxide fine particles), zirconium oxide (zirconium oxide fine particles), tin oxide, beryllium oxide, antimony oxide, tungsten oxide, and cerium oxide, which are obtained by mixing two or more of them.

From the viewpoint of ensuring transparency of the hard coat layer, the diameter of the inorganic oxide fine particles is preferably 1nm to 100nm, more preferably 1nm to 50 nm. In addition, from the viewpoint of ensuring the hardness and toughness of the hard coat layer to a proper extent, the blending amount (concentration) of the inorganic oxide fine particles is preferably 40wt% to 60 wt% of the total components of the hard coat layer.

In addition, at least one of acetylacetone metal salt and ethylenediamine tetraacetic acid metal salt is added to the hard coating liquid as a curing catalyst, and a surfactant, a colorant, a solvent, and the like are added as needed to ensure adhesion to a substrate, to facilitate formation, to impart a desired (semi) transparent color, and the like.

The inorganic oxide (metal oxide) in the inorganic oxide fine particles is selected so as not to be absorbed as much as possible in the visible light range. This is based on the viewpoint of ensuring high transmittance throughout the entire visible light region and ensuring a state in which the difference in the color seen when the lens is worn is extremely small from the color seen when the lens is seen with the naked eye. In this respect, the inorganic oxide is preferably an oxide of one or more metals other than Ti (titanium) and Ce (cerium). The oxides of Ti (titanium) and Ce (cerium) absorb in the visible light region (especially the short wavelength side), so they are excluded from the preferred metal oxides.

Examples of the preferable metal oxide include oxides of Sb (antimony), sn (tin), si (silicon), al (aluminum), ta (tantalum), la (lanthanum), fe (iron), zn (zinc), W (tungsten), zr (zirconium), in (indium), or a combination thereof.

The physical film thickness of the hard coat layer is preferably 0.5 μm or more and 4.0 μm or less. The lower limit of the film thickness range is determined based on the following reasons: if it is thinner than the lower limit, it is difficult to obtain sufficient hardness. On the other hand, the upper limit is determined based on the following reason: if the thickness is larger than the upper limit, the possibility of occurrence of problems related to physical properties such as cracks and brittleness increases sharply, and the influence of the absorption (decrease in transmittance) of the visible light region by the inorganic oxide fine particles increases. As the hard coating agent for the hard coating layer, a known photo-curable coating agent may be used in addition to the above-mentioned heat-curable coating agent.

The spectacle lens according to the first embodiment may further include an antireflection film layer (also referred to as an "antireflection film" or "antireflection layer") that is coated on at least one surface of the base material layer and is formed of a material that does not contain an ultraviolet absorber. The antireflection film layer may be formed on the base material layer, but preferably, may be formed on the hard coat film layer. The antireflection film layer may be formed of an optical multilayer film, and may be formed of a component containing no aromatic compound.

From the viewpoint of securing the antireflection function, the optical multilayer film is preferably formed so as to have a flat and high transmittance distribution in the entire ultraviolet region and visible light region.

The optical multilayer film may have a structure in which low refractive index layers and high refractive index layers are alternately laminated and an odd number of layers (total 5 layers, total 7 layers, etc.) are preferably provided as a whole. More preferably, if the layer closest to the substrate (the layer closest to the substrate) is the first layer, the odd-numbered layer may be a low refractive index layer, and the even-numbered layer may be a high refractive index layer. The low refractive index layer and the high refractive index layer are formed by a vacuum evaporation method, an ion-assisted deposition method, an ion plating method, a sputtering method, or the like.

In the experiments of the inventors of the present application, data showing an increase in the transmittance of visible light of about 5% was obtained by forming an antireflection film layer on a base material layer or a hard coat film layer. Therefore, by providing the antireflection film layer, transmittance can be improved even in the ultraviolet wavelength region.

< Eyeglass lens >

The eyeglass lens according to the first embodiment includes the base material layer and the coating film layer. For example, a base material layer of a spectacle lens is formed by using the compound shown in fig. 2 to 4, and a hard coat layer and/or an antireflection film layer as the coat layer is formed on at least one surface of the base material layer. In the eyeglass lens according to the first embodiment, the ultraviolet ray region can be transmitted, and the average transmittance of both the base material and the coating film in the ultraviolet ray region is at least 10%. As a result, in the conventional eyeglass lens, as shown in fig. 1, the average transmittance in the ultraviolet region is less than 10%, but in the eyeglass lens according to the first embodiment, the average transmittance in the ultraviolet region is 10% or more due to the total transmittance characteristics of the base material layer and the coating layer, and ultraviolet light can be transmitted further than in the conventional eyeglass lens, and natural light can be transmitted further to the eye. The eyeglass lens according to the first embodiment can be applied to a spectacle lens with power, and a user can transmit light close to natural light to eyes while correcting vision.

In the eyeglass lens according to the first embodiment, it is preferable that the total average transmittance (or transmittance) of the base material layer and the coating film layer is 5% or more in UVB (2 nd wavelength region) of 280nm or more and less than 320nm, and the total average transmittance (or transmittance) of the base material layer and the coating film layer is 15% or more in UVA (1 st wavelength region) of 320nm or more and 400nm or less. In particular, by transmitting the 1 st wavelength region including a part of blue light of 380nm to 495nm and the wavelength region around the part of blue light, as compared with the 2 nd wavelength region having a shorter wavelength, natural sunlight is transmitted to eyes more than in the conventional spectacle lens having an ultraviolet blocking function, and thus, it is expected that there is a good influence on physical and mental development of children, and the risk of myopia increase is reduced. In addition, it can be said that any of the lenses for spectacles according to the first embodiment transmits ultraviolet rays in the 1 st wavelength region.

In the eyeglass lens according to the first embodiment, it is more preferable that the total average transmittance (or transmittance) of the base material layer and the coating film layer is 10% or more in UVB (2 nd wavelength region) of 280nm or more and less than 320nm, and the total average transmittance (or transmittance) of the base material layer and the coating film layer is 55% or more in UVA (1 st wavelength region) of 320nm or more and 400nm or less. Even if the substrates were made of only the compounds shown in fig. 2 to 3, the average transmittance in the 2 nd wavelength region was about 15% to 35%, and the average transmittance in the 1 st wavelength region was about 60% to 85%. Therefore, even when a predetermined coating film layer is formed on the substrate shown in fig. 2 to 3, at least the average transmittance (or transmittance) in the 2 nd wavelength region can be ensured to be about 10% or more, and the average transmittance (or transmittance) in the 1 st wavelength region can be ensured to be about 55% or more.

Further, in the eyeglass lens according to the first embodiment, it is preferable that the total average transmittance (or transmittance) of the base material layer and the coating film layer is 50% or more in UVB (2 nd wavelength region) of 280nm or more and less than 320nm, and the total average transmittance (or transmittance) of the base material layer and the coating film layer is 85% or more in UVA (1 st wavelength region) of 320nm or more and 400nm or less. Even if the substrate is made of only the compound shown in fig. 4, the average transmittance in the 2 nd wavelength region is about 55%, and the average transmittance in the 1 st wavelength region is about 90%. Therefore, even when a substrate made of the compound shown in fig. 4 is used as a substrate layer and a predetermined coating film layer is formed, at least the average transmittance (or transmittance) in the 2 nd wavelength region can be ensured to be about 50% or more, and the average transmittance (or transmittance) in the 1 st wavelength region can be about 85% or more.

The upper limit may be set for the average transmittance in the ultraviolet region to constitute a spectacle lens. For example, in the eyeglass lens according to the first embodiment, the upper limit of the total average transmittance of the base material layer and the coating film layer in the ultraviolet region of 280nm to 400nm may be set to 65%.

Further, upper limits of transmittance may be set for the 1 st wavelength region and the 2 nd wavelength region, respectively. For example, the upper limit of the total transmittance of the base material layer and the coating film layer in the 1 st wavelength region may be set to 80%, and the upper limit of the total transmittance of the base material layer and the coating film layer in the 2 nd wavelength region may be set to 50%. In order to set an upper limit to the transmittance in the ultraviolet region, a prescribed amount of the ultraviolet absorber may be mixed in the base material or the main material of the coating film. Thus, the eyeglass lens according to the first embodiment can transmit an appropriate wavelength range or an appropriate amount of ultraviolet rays in consideration of the advantages and disadvantages of ultraviolet rays irradiated to the eyes.

In addition, the refractive index of the base material layer in the first embodiment is preferably higher than that of glass in the short wavelength region. The eyeglass lenses of the first embodiment are subjected to various treatments to ensure generally required performance for resistance to ultraviolet aging, abrasion, and the like. In this case, it is preferable not to perform the treatment using the ultraviolet absorbing material.

Second embodiment

Next, in the second embodiment, a spectacle lens that transmits ultraviolet light as much as possible is described as in the first embodiment. Here, the inventors examined transmittance in the ultraviolet region and visible light region for various resins as alternatives to the base material layer of the eyeglass lens of the technology of the present invention.

Fig. 5 is a view showing an example of the light transmittance of the alternative substrate according to the second embodiment. The resin of the alternative substrate shown in fig. 5 is shown below.

Resin 1: the doctor blade (registered trademark) VH000

Resin 2: amera (registered trademark) L000

Resin 3: ZEONEX (registered trademark) K22R

Resin 4: ZEONEX (registered trademark) K26R

Resin 5: TPX (registered trademark) RT18

Resin 6: ARTON (registered trademark) F3500

Resin 7: APEL (registered trademark) 5014XH

Resin 8: CR-39 (registered trademark)

Resin 9: MR-8 (registered trademark)

Resin 10: MR-10 (registered trademark)

The resins 1 to 6 and 8 to 10 were each 2mm thick test pieces, and the resin 7 was only 3mm thick test pieces.

The transmittance of each resin shown in fig. 5 increases sharply in a lower wavelength region than the conventional eyeglass lens shown in fig. 1. For example, the transmittance of the conventional spectacle lenses increases rapidly from around 380nm, whereas the transmittance of each resin shown in fig. 5 increases rapidly in a wavelength region of 330nm or less.

From this, it is clear that each of the resins shown in FIG. 5 transmits the wavelength in the ultraviolet region (280 to 400nm or 280 to 380 nm). In particular, it is important that the transmittance in the wavelength range of 360 to 380nm is higher than that of the conventional lens in order to transmit ultraviolet rays as much as possible based on the tendency of the transmittance curve. For example, in all of the resins 1 to 10, the average transmittance of 360 to 380nm of the individual resins exceeds 80%, and the transmittance itself exceeds 80% in this region. In the resins 1 to 4 preferred in the technique of the present invention, the average transmittance at 360 to 380nm exceeds 90%.

The reason why the transmittance in the wavelength region of 360 to 380nm is required to be high is as follows: if the transmittance in this region is high (for example, the threshold is 60% or more and 80% or more), even if the transmittance tends to decrease in the wavelength region of 360nm or less, the transmittance starts to decrease from a higher transmittance in the wavelength region of 360 to 380nm, and therefore the transmittance can be maintained at a constant level on average in the wavelength region of 280 to 360 nm. For example, even the resin 6 having a reduced transmittance at the longest wavelength (around 360 nm) has a transmittance of 25 to 30% on average in the wavelength region of 280 to 360 nm.

In the example shown in FIG. 5, resin 1 has a transmittance of 60% or more at 280nm, and transmits light rays in the ultraviolet region satisfactorily. Further, the average transmittance of each resin in the UVA region (315 to 400 nm) is as follows:

Resin 1:90.7%, resin 2:91.2%, resin 3:83.5%, resin 4:87.4%, resin 5:83.4%, resin 6:64.7%, resin 7:68.7%, resin 8:85.2%, resin 9:82.7%, resin 10:76.3%

As described above, in the UVA region, the resins 1 to 5 and 8 to 10 have an average transmittance of 75% or more, and the resins 1 to 2,4 and 8 preferred in the technique of the present invention have an average transmittance of 85% or more, and particularly the resins 1 to 2 more preferred for the technique of the present invention have an average transmittance of 90% or more.

Fig. 6 is a view showing an example of light transmittance in the case where a uv-visible light AR (Anti Reflection) coating layer that prevents reflection of uv light and visible light is applied to both sides of the resins 1 to 10 shown in fig. 5. When the transmittance shown in fig. 6 is compared with the transmittance shown in fig. 5, first, the transmittance of each resin having an ultraviolet-visible light AR coating layer formed in the ultraviolet region (380 nm or less) is improved. For example, in the resin 4, the transmittance of the resin alone was about 75% in the vicinity of 315nm, whereas the transmittance of the resin having the ultraviolet-visible light AR coating layer was about 80%, and the transmittance increased by about 5%.

In the visible light region (the lower limit is 380 to 400nm, and the upper limit is 760 to 780 nm), the average transmittance of each resin having the ultraviolet-visible light AR coating layer also exceeds about 95%, but the average transmittance in the case of the resin alone is about 85 to about 90%. Thus, by forming the ultraviolet-visible light AR coating layer on the substrate, it is possible to further transmit the visible light region and the ultraviolet region.

Fig. 7 is a graph showing a table comparing average transmittance in the case where each coating film layer is applied to the resins 1,3, and 6 according to the second embodiment. In the example shown in fig. 7, the visible light AR coating sample represents a resin having a film layer for preventing reflection of visible light coated on both sides (one side and the opposite side), and the ultraviolet-visible light AR coating sample represents a resin having a film layer for preventing reflection of ultraviolet light and visible light coated on both sides.

Fig. 7A is a graph showing a table of average transmittance of each resin of UVA and UVB regions. In the example shown in fig. 7A, even in the case of a single substrate, the average transmittance of the resin 1 and the resin 3 in the UVA and UVB regions was 36.2% or more. In particular, in the UVA region, even with respect to the resin 1 and the resin 3, the average transmittance is 80% or more even with respect to the base material alone, and the lens is preferable in the technique of the present invention.

Even though the average transmittance in the UVB region is less than 10% in the substrate of the resin 6 alone, 57.4% of the light is transmitted in the UVA region, and the substrate has a sufficient transmittance in the ultraviolet region as compared with the conventional lens.

When the visible light AR coating film layers that are generally used are coated on both sides, the transmittance of each resin in both UVA and UVB regions is reduced by several percent to ten or more percent. This is believed to be due to the following reasons: the visible light AR coating layer prevents reflection of visible light but does not prevent reflection of wavelengths in the ultraviolet region, and thus causes the wavelengths in the ultraviolet region to be reflected, so that the amount of ultraviolet transmitted through the coated resin (substrate) is reduced.

When ultraviolet-visible AR coating layers that prevent reflection of ultraviolet rays and visible light are coated on both sides for the purpose of the technology of the present invention, the transmittance of each resin in both UVA and UVB regions increases by several percent. For example, the transmittance of each of the resins 1 to 6 increases by 3% or more in the UVA region, and the ultraviolet region is transmitted better than that of the substrate alone, so that a lens close to the naked eye can be provided. In particular, for the resin 6, the transmittance in the UVA region exceeds 60% by forming an ultraviolet-visible AR coating layer.

Fig. 7B is a graph showing a table of average transmittances of each of 280 to 380nm (region 1) and 280 to 400nm (region 2), which are referred to as ultraviolet regions. As shown in fig. 7B, the average transmittance of the base material of the resin 1 alone exceeds 86% in any region, and a lens that transmits ultraviolet rays satisfactorily can be obtained. Further, even the base material of the resin 3 alone has an average transmittance of more than 65%, and even the base material of the resin 6 alone has an average transmittance of more than 40%.

The average transmittance in region 1 was compared to the average transmittance in region 2, with the average transmittance in region 2 being only a few percent higher. This shows that the transmittance of each resin increases from a region having a shorter wavelength to a region having a longer wavelength, and thus the transmittance of 380 to 400nm increases the average transmittance by several percent.

In the case where the resin 1 is coated with the ultraviolet-visible light AR coating film layers on both sides, the average transmittance in the region 2 exceeds 90%, and the average transmittance even in the region 1 is about 89%, indicating that a lens close to the naked eye can be provided. In addition, when the ultraviolet-visible light AR coating film layers are applied to both surfaces of the lenses, resin 3 and resin 6 also show that more than 50% in the region 2 and more than 42% in the region 1 sufficiently transmit the ultraviolet ray region, compared with the conventional lenses.

From the above, it was confirmed that the average transmittance was increased by applying the ultraviolet-visible light AR coating layer in addition to the base material (fig. 5 to 7). Therefore, for the alternative base material of each resin shown in fig. 5, the average transmittance can be increased by coating the ultraviolet-visible light AR coating layer on at least one side of the base material layer. Therefore, when an ultraviolet-visible light AR coating layer is applied to at least one surface of each of the resins 1 to 10 shown in fig. 5, the average transmittance at 360 to 380nm can be 80% or more.

Next, the inventors have selected three resins, resin 1, resin 3, and resin 6, as the materials for the spectacle lenses of the technique of the present invention, and have performed various experiments, and therefore, the results of the various experiments will be described.

Fig. 8 is a graph comparing transmittance of resins 1, 3, and 6 with that of the conventional lenses. In the example shown in fig. 8, the conventional lens 1 is a hawk hard coat layer S0.00 manufactured by HOYA corporation, and the conventional lens 2 is a hawk vp_s0.00. In the example shown in fig. 8, each resin had a structure in which an ultraviolet-visible light AR coating layer was formed on both sides of a test piece having a 2mm thick base layer made of each resin. Hereinafter, as for each resin in fig. 9 to 11, a base material layer having a thickness of 2mm was subjected to a predetermined treatment in the same manner as in fig. 8.

As shown in fig. 8, the conventional lenses 1 and 2 are lenses for spectacles having a relatively higher transmittance in the ultraviolet region than the conventional lens shown in fig. 1, but the transmittance is drastically reduced from the vicinity of 400nm to the low wavelength region. On the other hand, the average transmittance of the resins 1,3, 6 is about 90% or more in the region of 360 to 380nm, and the transmittance of the resins 1,3 is more than 90% in the region of 360 to 380 nm.

From the table shown in fig. 8, since the transmittance of the resins 1, 3, and 6 is higher than that of the conventional lenses 1 and 2 in the ultraviolet region (280 to 400nm or 280 to 380 nm), it is clear that the resins 1, 3, and 6 transmit more ultraviolet rays.

Fig. 9 is a graph showing a table comparing the transmittance of resins 1,3, 6 with that of the conventional lenses in each region. The transmittance was also compared in the case where a radical scavenger was added to the base material layer of each resin shown in fig. 9. As the radical scavenger, 0.2wt% of a Utility drive (registered trademark) (LA-63P, LA-52 or LA-57) was used in the base layer of each resin. The radical scavenger prevents the aging of the lens, and thus can improve the durability of the lens.

In the results shown in fig. 9 (a), in the resin 1, when there was an ultraviolet-visible light AR coating layer and no radical scavenger, the average transmittance in the region of 360 to 380nm was 95.1%, and the average transmittance in the region of 360 to 400nm was 95.6%. In the resin 1 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-63P), the average transmittance in the region of 360 to 380nm was 91.5%, and the average transmittance in the region of 360 to 400nm was 92.7%. In the resin 1, even if the radical scavenger is added to the base material layer, the average transmittance in each region exceeds 90%.

In the results shown in fig. 9 (B), in the resin 3, when there was an ultraviolet-visible light AR coating layer and no radical scavenger, the average transmittance in the region of 360 to 380nm was 95.0%, and the average transmittance in the region of 360 to 400nm was 95.5%. In the resin 3 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-52 or LA-57), the average transmittance in the region of 360 to 380nm is about 88 to 90%, and the average transmittance in the region of 360 to 400nm is about 90 to 91%. In the resin 3, even if the radical scavenger is added to the base material layer, the average transmittance in each region is about 90%.

In the result shown in fig. 9 (C), in the resin 6, when there was an ultraviolet-visible light AR coating layer and no radical scavenger, the average transmittance in the region of 360 to 380nm was 89.8%, and the average transmittance in the region of 360 to 400nm was 91.5%. In the resin 6 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-52), the average transmittance in the region of 360 to 380nm was 81.9%, and the average transmittance in the region of 360 to 400nm was 84.8%.

As a comparative example, 0.001wt% of an ultraviolet absorber (a registered trademark) LA-46, which is usually added for the purpose of preventing aging of lenses, was further added to the resin 6. Even so, the average transmittance in the region of 360 to 380nm was 77.8%, and the average transmittance in the region of 360 to 400nm was 82.6%. The average transmittance exceeds 75% in any of the regions, and it is found that ultraviolet rays can be transmitted well. The average transmittance in the region of 360 to 380nm and 360 to 400nm was slightly decreased when the ultraviolet light absorber was additionally added, as compared with the case where the radical scavenger was only added, but it is estimated from the degree of decrease in the transmittance, even when the ultraviolet light absorber was added to the base material layer in an appropriately adjusted amount instead of the radical scavenger, the average transmittance in the region could be maintained at a high level as well.

In the examples shown in fig. 9 (a) to (C), when the ultraviolet-visible light AR coating layer is formed on the lens, the transmittance in the ultraviolet region becomes higher than when the general visible light AR coating layer is formed on the lens. This confirmed that the ultraviolet-visible light AR coating layer was effective.

In the result shown in fig. 9 (D), in the conventional lens 1, the average transmittance in the region of 360 to 380nm was 46.0%, and the average transmittance in the region of 360 to 400nm was 64.5%. In the conventional lens 2, the average transmittance in the region of 360 to 380nm was 39.6%, and the average transmittance in the region of 360 to 400nm was 60.4%. In the conventional lenses 1 and 2, the average transmittance in the region of 360 to 380nm was not more than 60%. Thus, the spectacle lens having a total average transmittance of 60% or more of the base material layer and the coating film layer in a wavelength region of 360nm or more and less than 380nm can be effectively different from the conventional lens.

Fig. 10 is a graph of table a showing the transmittance of comparative resins 1, 3, 6 in each region. In the table shown in fig. 10, transmittance in the UVA (315 to 380 nm) region and transmittance in the UVB (280 to 315 nm) region are compared.

In the result shown in fig. 10 (a), in the resin 1, when there was an ultraviolet-visible AR coating layer and no radical scavenger, the average transmittance in the UVA region was 93.8%, and the average transmittance in the UVB region was 79.8%. In the resin 1 having an ultraviolet-visible AR coating layer and having a radical scavenger (LA-63P), the average transmittance in the UVA region was 89.0%, and the average transmittance in the UVB region was 60.5%.

In the result shown in fig. 10 (B), in the resin 3, when there was an ultraviolet-visible AR coating layer and no radical scavenger, the average transmittance in the UVA region was 85.0%, and the average transmittance in the UVB region was 37.3%. In the resin 3 having the ultraviolet-visible AR coating layer and having the radical scavenger (LA-52), the average transmittance in the UVA region was 67.1%, and the average transmittance in the UVB region was 14.2%. In the resin 3 having an ultraviolet-visible AR coating layer and having a radical scavenger (LA-57), the average transmittance in the UVA region was 60.5%, and the average transmittance in the UVB region was 7.8%. In the case of resin 3, as a radical scavenger, the average transmittance in each region was higher when LA-52 was used as compared with LA-57.

In the result shown in fig. 10 (C), in the resin 6, when there was an ultraviolet-visible AR coating layer and no radical scavenger, the average transmittance in the UVA region was 60.5%, and the average transmittance in the UVB region was 9.2%. In the resin 6 having an ultraviolet-visible AR coating layer and having a radical scavenger (LA-52), the average transmittance in the UVA region was 49.2%, and the average transmittance in the UVB region was 3.2%.

Further, as a comparative example, as in FIG. 9 (C), an ultraviolet absorber (LA-46) was further added in an amount of 0.001wt% to the resin 6. In this case, in the resin 6 having the ultraviolet-visible AR coating layer, the average transmittance in the UVA region was 43.8%, and the average transmittance in the UVB region was 2.3%. In addition, similarly, it is assumed that even when only an appropriately adjusted amount of ultraviolet absorber is added to the base material layer instead of the radical scavenger, the average transmittance in this region can be maintained at a high level.

From the results shown in fig. 10 (a) to (C), the average transmittance of the resin 1 is high even when the radical scavenger is added, and the average transmittance of the UVB region is reduced by adding the radical scavenger to the base material layer, but the transmittance of the UVA region is high, so that it can be said that ultraviolet rays at a certain level or more are transmitted in the ultraviolet region, for the resins 3 and 6.

Fig. 11 is a graph of table B showing the transmittance of comparative resins 1,3, 6 in each region. In the table shown in fig. 11, transmittance in the ultraviolet region of 280 to 380nm (region 1) and transmittance in the ultraviolet region of 280 to 400nm (region 2) were compared.

In the result shown in fig. 11 (a), in the resin 1, when there was an ultraviolet-visible light AR coating layer and no radical scavenger, the average transmittance in the region 1 was 88.9%, and the average transmittance in the region 2 was 90.1%. In the resin 1 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-63P), the average transmittance in the region 1 was 84.5%, and the average transmittance in the region 2 was 86.2%.

In the result shown in fig. 11 (B), in the resin 3, when there was an ultraviolet-visible light AR coating layer and no radical scavenger, the average transmittance in the region 1 was 68.3%, and the average transmittance in the region 2 was 72.9%. In the resin 3 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-52), the average transmittance in the region 1 was 48.6%, and the average transmittance in the region 2 was 55.9%. In the resin 3 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-57), the average transmittance in the region 1 was 42.9%, and the average transmittance in the region 2 was 50.3%.

In the result shown in fig. 11 (C), in the resin 6, when there was an ultraviolet-visible light AR coating layer and no radical scavenger, the average transmittance in the region 1 was 42.5%, and the average transmittance in the region 2 was 51.0%. In the resin 6 having the ultraviolet-visible light AR coating layer and having the radical scavenger (LA-52), the average transmittance in the region 1 was 33.1%, and the average transmittance in the region 2 was 42.2%.

Further, as a comparative example, as in FIG. 9 (C), an ultraviolet absorber (LA-46) was further added in an amount of 0.001wt% to the resin 6. In this case, in the resin 6 having the ultraviolet-visible light AR coating layer, the average transmittance in the region 1 was 29.3%, and the average transmittance in the region 2 was 39.0%. In addition, similarly, it is assumed that even when only an appropriately adjusted amount of ultraviolet absorber is added to the base material layer instead of the radical scavenger, the average transmittance in this region can be maintained at a high level.

According to the results shown in fig. 11 (a) to (C), even if a radical scavenger is added to the resin 1, the average transmittance in the entire ultraviolet ray region is high. The resins 3 and 6, in which the radical scavenger was added, were reduced in average transmittance in the entire ultraviolet region, but as shown in fig. 10, were said to transmit ultraviolet rays at a level equal to or higher than a predetermined level in the entire ultraviolet region because the transmittance in the UVA region was high.

Next, the reflectance of each antireflection film will be described. Fig. 12 is a graph showing the reflectance of each antireflection film applied to a test piece made of resin 6 having a base layer with a thickness of 2 mm. In the example shown in fig. 12, in the resin 6 without the antireflection film, the reflectance increased from about 5% to about 8% around 330 nm.

In the resin 6 having the coating layer of visible light AR formed thereon, the reflectance is high at a level of not more than visible light (for example, 780 to 380 nm), substantially more than 10%, and the reflectance is 8% or less in the visible light range. In the resin 6 having the coating layer of the ultraviolet-visible light AR formed thereon, the reflectance was about 4% or less from 280nm to 730nm in the ultraviolet region, and it was found that not only visible light but also ultraviolet light was transmitted well.

According to the graph shown in fig. 12, the resin 6 having the ultraviolet-visible light AR coating layer formed thereon has a reflectance of 5% or less in a wavelength range of 280nm to 780nm, and can be used as a coating layer that transmits ultraviolet rays satisfactorily in the technique of the present invention. In addition, when an ultraviolet-visible light AR coating layer is formed, the reflectance can be reduced, and the usefulness of the coating layer is exhibited, as compared with the case where no coating layer is formed.

Fig. 13 is a graph showing transmittance caused by the difference of AR coating layers on the respective sides of the resin 3. In the example shown in FIG. 13, the transmittance in each of the following examples was shown for a test piece of a 1mm thick base material layer composed of resin 3.

Separate substrate

Two sides of the transparent glass are provided with visible light AR coating layers

The two sides are provided with an ultraviolet visible light AR coating layer

The surface (convex surface) has a visible light AR coating layer and the back surface (concave surface) has an ultraviolet-visible light AR coating layer, the surface has an ultraviolet-visible light AR coating layer and the back surface has a visible light AR coating layer

In the example shown in fig. 13, since the AR coating layers preventing reflection of visible light are formed, the transmittance of the resin 3 having the AR coating layers formed thereon is higher in the visible light region (for example, 780 to 380 nm) than that of the resin 3 having the base material layer alone.

On the other hand, in the ultraviolet region (380 nm or less), particularly in the region of 360 to 380nm, the transmittance of the resin 3 having the ultraviolet-visible AR coating layer formed on at least one surface thereof is higher than the transmittance of the resin 3 of the base material layer alone. The resin 3 having the visible light AR coating layer formed on the front surface and the ultraviolet/visible light AR coating layer formed on the back surface has almost the same transmittance as the resin 3 having the ultraviolet/visible light AR coating layer formed on the front surface and the visible light AR coating layer formed on the back surface.

In addition, in the region of about 340nm or less, even if the ultraviolet-visible light AR coating layer is formed on one surface, the transmittance becomes lower than that in the case of the base material layer alone, which is thought to be due to the formation of the visible light AR coating layer that easily reflects ultraviolet rays on the other surface (see fig. 12). However, the transmittance in the visible light region of the resin 3 having the ultraviolet-visible light AR coating film layer formed on at least one surface thereof is higher than that in the case of the base material layer alone, and the appearance of suppressing so-called glare of the lens surface is exhibited, and a lens for spectacles as a final product is more preferable. Further, the resin 3 having the visible light AR coating layer formed on at least one surface has a higher transmittance in the ultraviolet region than the resin 3 having the visible light AR coating layer formed on both surfaces, which can be seen in a general spectacle lens, and a practical spectacle lens can be produced which is more nearly in the naked eye state.

Further, the resin 3 having the ultraviolet-visible light AR coating film layers formed on both sides thereof has a higher transmittance in a region of about 315nm or more than the resin 3 of the base material layer alone.

As described above, according to the second embodiment, experiments were performed using various resins, and as a result, it was possible to identify a base material for a spectacle lens in the technique of the present invention. For example, at least any one of the resins 1 to 10 shown in fig. 5 can be used as a base layer to form a spectacle lens. In the second embodiment, the average transmittance in the region of 360 to 380nm is focused on in order to transmit ultraviolet rays. By setting the threshold value (60%, 80%, etc.) of the total average transmittance of the coating film layer and the base material layer in the region of 360 to 380nm, a practical spectacle lens satisfying the above conditions and approaching the naked eye state can be formed.

The base material layer or the coating film layer in the second embodiment may be any material or material that can be applied as described in the first embodiment. As the base material, for example, a resin of a fluorine compound having high transmittance may be used, and HMX10 of the industrial company of dow is given as a specific example.

Further, as an example, the eyeglass lens in the technique of the present invention can be applied as a non-vision correcting lens.

The present invention has been described above using the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. Those skilled in the art will recognize that various alterations and modifications may be added to the above embodiments. It is to be understood from the description of the claims that the embodiments to which the above-described various modifications and improvements are added may be included in the technical scope of the present invention.

Further, the technology of the present invention is disclosed in the following supplementary notes.

[ Additional note 1]

A lens for spectacles, comprising:

a substrate layer; and

A coating layer coated on at least one surface of the base material layer,

The total average transmittance of the substrate layer and the coating layer is 10% or more in a wavelength region of 280nm to 400 nm.

[ Additionally noted 2]

The spectacle lens according to the supplementary note 1, wherein,

In the 1 st wavelength region of 320nm to 400nm, the total average transmittance of the substrate layer and the coating layer is 15% or more,

In a 2 nd wavelength region of 280nm or more and less than 320nm, the total average transmittance of the base material layer and the coating film layer is 5% or more.

[ Additionally recorded 3]

The spectacle lens according to the annex 2, wherein,

In the 1 st wavelength region, the total average transmittance of the base material layer and the coating film layer is 55% or more.

In the 2nd wavelength region, the total average transmittance of the base material layer and the coating film layer is 10% or more.

[ Additional note 4]

The spectacle lens according to the supplementary note 3, wherein,

In the 1 st wavelength region, the total average transmittance of the base material layer and the coating film layer is 85% or more,

In the 2nd wavelength region, the total average transmittance of the base material layer and the coating film layer is 50% or more.

[ Additional note 5]

The spectacle lens according to any one of supplementary notes 1 to 4, wherein,

The base material layer is formed of at least one of an aliphatic polycarbonate, an aliphatic olefin polymer, an aliphatic acrylic resin, and an aliphatic nylon resin.

[ Additional note 6]

The spectacle lens according to the supplementary note 5, wherein,

The aliphatic acrylic resin contains an acrylic resin that transmits ultraviolet rays.

[ Additionally noted 7]

The spectacle lens according to the supplementary note 5, wherein,

The aliphatic olefin polymer includes at least one of cyclic olefin polymers and aliphatic olefin polymers having no cyclic structure.

[ Additionally recorded 8]

The spectacle lens according to any one of supplementary notes 1 to 7, wherein,

The coating layer includes a hard coating layer formed of a material containing no ultraviolet absorber and/or an antireflection film layer formed of a material containing no ultraviolet absorber.

Claim (modification according to treaty 19)

1. A lens for spectacles, comprising:

A resin base material layer; and

A coating layer coated on at least one surface of the base material layer,

In a wavelength region of 360nm or more and less than 380nm, the total average transmittance of the substrate layer and the coating film layer is 60% or more.

2. The eyeglass lens according to claim 1, wherein,

In a wavelength region of 360nm or more and less than 380nm, the total average transmittance of the substrate layer and the coating film layer is 80% or more.

3. The eyeglass lens according to claim 1, wherein,

The reflectance of the coating layer in a wavelength region of 280nm or more and less than 780nm is 10% or less.

4. The eyeglass lens according to claim 3, wherein,

The coating layer is disposed on the one side of the base material layer and the opposite side of the one side.

5. The eyeglass lens according to claim 1, wherein,

The coating layer includes an antireflection film for ultraviolet light and visible light.

6. The eyeglass lens according to claim 1, wherein,

The substrate layer has an average transmittance of 80% or more in a wavelength region of 360nm or more and less than 380 nm.

7. The eyeglass lens according to claim 1, wherein,

The substrate layer comprises a radical scavenger and/or an ultraviolet absorber.

Claims

1. A lens for spectacles, comprising:

a substrate layer; and

A coating layer coated on at least one surface of the base material layer,

2. The eyeglass lens according to claim 1, wherein,

3. The eyeglass lens according to claim 1, wherein,

4. The eyeglass lens according to claim 3, wherein,

5. The eyeglass lens according to claim 1, wherein,

6. The eyeglass lens according to claim 1, wherein,

7. The eyeglass lens according to claim 1, wherein,