Spectacle lens and spectacles

Abstract

To provide a spectacle lens with good visibility.SOLUTION: A spectacle lens disclosed herein comprises a lens base material and multilayer films respectively provided on an object-side surface and an eyeball-side surface of the lens base material. The spectacle lens has a local maximum reflectance exceeding 2.00% in a wavelength range of 380-780 nm on the object-side or eyeball-side surface, and a reflectance of each surface in a specific wavelength range satisfies a separately defined conditional expression, where a surface 1 represents a surface with a local maximum exceeding 2.00% and a surface 2 represents the other surface.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a spectacle lens and a pair of glasses. [Background technology]

[0002] Spectacle lenses are generally manufactured by forming a functional film on the surface of a lens substrate to provide the spectacle lens with a desired function. As such a functional film, a multilayer film is provided on the surface of the lens substrate (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6073355 specification Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, various products featuring various functions have been proposed and sold in the spectacle lens market. In order to provide spectacle lenses with higher added value in the market, good visibility is one of the desirable features.

[0005] An object of one aspect of the present invention is to provide a spectacle lens with good visibility. [Means for solving the problem]

[0006] Conventional multilayer films for glasses generally have a blue light blocking function and the reflection is adjusted to a color according to individual preferences. Since glasses lenses with such multilayer films have to have a high reflectance in a certain wavelength band, light reflected multiple times within the glasses lens (ghost light) enters the eyes of the glasses wearer while maintaining its light intensity, causing a decrease in visibility. In response to this, Japanese Patent No. 6073355 (Patent Document 1) discloses a spectacle lens in which the ghost light intensity evaluated by the stimulus value Y is equal to or less than a predetermined value. Specifically, the spectacle lens disclosed in Japanese Patent No. 6073355 (Patent Document 1) aims to reduce the ghost light intensity by making one surface of the spectacle lens have a minimum reflection value in the vicinity of a wavelength at which the other surface has a maximum reflection value. However, in the specification of Patent No. 6073355 (Patent Document 1), the ghost light intensity is specified only for the stimulus value Y, and from the viewpoint of color vision, the wearing evaluation is limited to an evaluation mainly for green light (evaluation of ghost light caused by fluorescent lighting). In response to this, the present inventor considered that it would be desirable to reduce the ghost light intensity of the XYZ tristimulus values ​​in order to improve the visibility of eyeglass lenses, since ghost light corresponding to human cone cells should be reduced from the viewpoint of color vision.Then, as a result of further intensive research, the present inventor newly discovered that for eyeglass lenses having a maximum reflectance value in the visible light range of more than 2.00% on one side, it is possible to suppress the ghost light intensity in the XYZ tristimulus values ​​to a low level by controlling the reflection characteristics of each surface of the eyeglass lens through the design of a multilayer film so as to satisfy all of the following formulas 1 to 3.

[0007] One aspect of the present invention is as follows. [1] A lens substrate and a multilayer film located on an object-side surface and an object-side surface of the lens substrate, The maximum value in the wavelength band of 380 nm to 780 nm on the object side surface or eyeball side surface of the eyeglass lens exceeds 2.00%, The surface where the maximum value exceeds 2.00% is designated as surface 1, and the other surface is designated as surface 2. Rb1 is the average reflectance of surface 1 in the wavelength band of 420 to 440 nm, Rb2 is the average reflectance of surface 2 in the wavelength band of 420 to 440 nm, Rg1 is the average reflectance of surface 1 in the wavelength band of 530 to 540 nm, Rg2 is the average reflectance of surface 2 in the wavelength band of 530 to 540 nm, Rr1 is the average reflectance of surface 1 in the wavelength bands of 440 to 460 nm and 560 to 580 nm, Rr2 is the average reflectance of surface 2 in the wavelength bands of 440 to 460 nm and 560 to 580 nm, Rb2, Rg2 and Rr2 are 2.00% or less, and A spectacle lens that satisfies all of the following formulas 1 to 3. Formula 1: Rb1*Rb2<2.0 Formula 2: Rg1*Rg2<2.0 Formula 3: Rr1*Rr2<2.0 [2] The eyeglass lens according to [1], wherein the difference in dominant wavelength between surface 1 and surface 2 is 70 nm or less. [3] The eyeglass lens according to [1] or [2], in which, when the integrated ghost light intensity after multiple reflections is evaluated using the tristimulus values ​​XYZ, excluding light that is transmitted without being reflected even once, the values ​​of X, Y, and Z (hereinafter also referred to as the "XYZ stimulus values ​​of ghost light") are all 1.50E-02 or less. [4] The eyeglass lens according to [3], wherein the values ​​of X, Y, and Z are all 5.00E-03 or less. [5] The eyeglass lens according to any one of [1] to [4], wherein the multilayer film on the surface 2 side includes one or more layers having a refractive index of 1.20 or more and 1.38 or less. [6] The eyeglass lens according to any one of [1] to [5], wherein the multilayer film on the surface 2 side includes one or more layers having a refractive index of 2.00 or more and 2.40 or less. [7] The eyeglass lens according to any one of [1] to [6], wherein the multilayer film on the surface 2 side includes one or more layers having a refractive index of 1.44 or more and 1.49 or less. [8] The eyeglass lens according to any one of [1] to [7], wherein the total number of high refractive index layers and low refractive index layers in the multilayer film on surface 2 side is 7 or more. [9] The difference in dominant wavelength between surface 1 and surface 2 is 70 nm or less; When the integrated ghost light intensity after n reflections, excluding the light that has been transmitted without being reflected, is evaluated using the tristimulus values ​​X, Y, and Z, the values ​​of X, Y, and Z are all 1.50E-02 or less. the multilayer film on the surface 2 side includes one or more layers having a refractive index of 1.20 or more and 1.38 or less, one or more layers having a refractive index of 2.00 or more and 2.40 or less, and one or more layers having a refractive index of 1.44 or more and 1.49 or less, and The eyeglass lens according to any one of [1] to [8], wherein the total number of high refractive index layers and low refractive index layers in the multilayer film on the surface 2 side is 7 or more.

[10] The eyeglass lens according to [9], wherein the values ​​of X, Y, and Z are all 5.00E-03 or less.

[11] Glasses equipped with the eyeglass lens according to any one of [1] to

[10] . Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to provide a spectacle lens in which ghost light intensity is suppressed at tristimulus values ​​of XYZ. Also, according to one aspect of the present invention, it is possible to provide spectacles including the spectacle lens. [Brief description of the drawings]

[0009] [Figure 1] A specific example of an envelope for finding a maximum value is shown below. [Diagram 2] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Diagram 3] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Figure 4] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Diagram 5] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Figure 6] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Figure 7] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Figure 8] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Figure 9] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 1 and 2. [Figure 10] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 11] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 12] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 13] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 14] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 15] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 16] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 17] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of each of the spectacle lenses of Examples 3 and 4. [Figure 18] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Figure 19] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Figure 20] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Figure 21]4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Figure 22] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Figure 23] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Figure 24] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. [Diagram 25] 4 shows the reflectance of the object-side surface and the eyeball-side surface at each wavelength of the eyeglass lens of Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The definitions and / or measurement methods of terms used in the present invention and this specification are explained below.

[0011] The "object-side surface" is the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens. The "eyeball-side surface" is the opposite surface, i.e., the surface that is located on the eyeball side when a wearer wears spectacles equipped with the spectacle lens.

[0012] The reflectance measured for the surface of a spectacle lens is the reflectance for light that is normally incident on the surface. The angle of incidence of light when measuring reflectance can be set in the reflectance measuring device. With respect to the angle of incidence of light incident on the surface to be measured, the angle of incidence of normally incident light is 0°, strictly speaking. However, from the viewpoint of the measurement optical system, some reflectance measuring devices use incident light with an incidence angle of about 0° to 5° as normally incident light. Such cases are also included in the "normal incidence" in the present invention and this specification. The reflectance can be measured at a pitch of, for example, 1 to 5 nm. The average reflectance in a certain wavelength band is the arithmetic mean of the reflectances determined in that wavelength band. Depending on the reflectance measuring instrument, multiple reflections between the measurement target surface and the opposing surface may occur, in which case multiple reflections may be suppressed by applying a treatment to the opposing surface to absorb or scatter the light (e.g., a black coating).

[0013] The "maximum value" will be explained below. Depending on the combination of the lens substrate and a hard coat layer described later, reflectance ripples having a period of about 5 to 30 nm may occur due to the influence of the refractive index difference between the lens substrate and the hard coat layer and the thickness of the hard coat layer. In this invention and this specification, the "maximum value" in the wavelength band of 380 nm to 780 nm refers to a point that is the maximum value among the reflectance values ​​(extreme values ​​or reflectance extreme values) at points that are upwardly convex in the wavelength band of 380 nm to 780 nm and that is macroscopically upwardly convex. In order to find the extreme values, arithmetic processing may be performed. As an example, since the period of the reflectance ripple derived from the hard coat layer is usually about 5 to 30 nm, the arithmetic moving average may be taken in a wavelength width of about 5 to 30 nm to make the ripple waveform somewhat gentler, and the extreme values ​​and maximum values ​​may be found. Alternatively, the maximum value may be obtained from an envelope curve connecting the peak values ​​of the ripple. A specific example of a method for obtaining the maximum value from an envelope curve connecting the peak values ​​of the ripple will be described below. In the examples and comparative examples described later, the maximum value was obtained by the following method. The points (extreme values) that are convex upwards in a certain wavelength interval are identified, and the maximum value is found from the line connecting the extreme values ​​(i.e., the envelope of the spectral reflectance). The variables are defined as follows: When the single wavelength for evaluating the extreme value is λ0 and the evaluation wavelength interval is Δλ, the wavelength shorter than λ0 is λs=λ0-Δλ, and the wavelength longer than λ0 is λl=λ0+Δλ. Let R(λ) be the reflectance at a wavelength. Define the sign function SING(x) such that when x is positive, SING(X) = +1, when x is negative, SING(X) = -1, and when x is the same, SING(X) = 0. In the above, if λ0 is maximum between ±Δλ, the point is convex, so the following equation: SING(R(λ0)-R(λs))-SING(R(λl)-R(λ0))>0 R(λ0) at the wavelength λ0 where The wavelength λ0 thus obtained is a convex point that includes a ripple. In addition, the wavelength interval Δλ at this time is preferably shorter than the ripple period observed on the surface of the object to be measured, and more preferably λs and λl are set to λ0±1 nm. In the examples and comparative examples described later, λs and λl are set to λ0±1 nm. Next, an envelope is drawn that connects the obtained convex points. The point at which the reflectance is highest obtained from the envelope is confirmed, and if that point is a macroscopically convex point, then that point is the maximum value. The reflectance of this maximum value is not the average reflectance value with ripples removed, but the actual measured value of the reflectance. Furthermore, when the above-mentioned numerical analysis is performed, if the point with the highest reflectance is the very end of the obtained envelope, the point is compared with the original reflectance waveform, which is the measurement result before the numerical analysis, to confirm whether the point is macroscopically convex. FIG. 1 shows a specific example of an envelope for determining a maximum value. For the purpose of explanation, FIG. 1 shows an envelope for a part of the wavelength band from 380 nm to 780 nm. In FIG. 1(a), the extreme value marked with a circle is the maximum value. In FIG. 1(b), the extreme value at the right end of the envelope is the point with the highest reflectance on the envelope, but this point is not macroscopically convex when the wavelength band on the longer wavelength side is also included, and therefore does not correspond to the maximum value. In the above numerical analysis, if the measurement data contains significant noise, peaks will be erroneously detected, so the measurement noise may be smoothed. Moreover, if there is no extreme value or maximum value according to the above definition, it is determined that there is no maximum value.

[0014] When the light that is transmitted without being reflected even once is excluded and the integrated ghost light intensity that has been multiple-reflected is evaluated using the tristimulus values ​​XYZ, the values ​​of X, Y, and Z can be calculated as follows. The ghost light intensity is defined by the following formula: Ghost light intensity = T1*T2*R1*R2*Ti 3 *((1-r n ) / (1-r)) During the ceremony, Ti: Internal transmittance (%) of the lens material of the eyeglass lens, R1: Surface reflectance of surface 1 (%), R2: Surface reflectance of surface 2 (%), T1: Surface transmittance of surface 1 (%), T2: Surface transmittance of surface 2 (%), r=(R1*R2)*Ti 2 , n is the number of multiple reflections inside the eyeglass lens. Since multiple reflections occur, n is infinity (∞). Each surface reflectance is considered to be less than 100%. Therefore, since |r|<1, Ghost light intensity = T1*T2*R1*R2*Ti 3 *(1 / (1-(R1*R2)*Ti 2 ), It becomes. It is assumed that the optical loss in the range of 380 nm to 780 nm on each of surfaces 1 and 2 is negligible. Therefore, on each of surfaces 1 and 2, T1+R1=100% and T2+R2=100%, and as a result, the ghost light intensity is calculated by the following formula. Ghost light intensity = (1-R1)(1-R2)R1*R2*Ti 3 / (1-R1*R2*Ti 2 ) The ghost light intensity can be calculated at each wavelength using the above formula, and the XYZ stimulus values ​​can be calculated from the resulting spectral characteristics using the CIE (International Commission on Illumination) 1931 color system (XYZ color system) D65-CIE 2° field of view XYZ color system. R1, R2 and Ti can be measured by a common spectrometer. The surface reflectances R1 and R2 can be directly measured using a reflectance measuring instrument such as a lens reflectance measuring instrument USPM-RU manufactured by Olympus Corporation or a spectrophotometer UH4150 manufactured by Hitachi High-Tech Corporation. An example of a method for calculating the internal transmittance Ti is as follows. The surface reflectance R0 of the lens substrate and the total light transmittance T of both sides of the lens substrate are measured, and calculated from the following formula.

number

[0015] The "film thickness" described in this specification is a physical film thickness. The film thickness can be determined by a known film thickness measurement method. For example, the film thickness can be determined by converting the optical film thickness measured by an optical film thickness measurement device into a physical film thickness.

[0016] [Eyeglass lenses] Hereinafter, a spectacle lens according to one aspect of the present invention will be described in further detail.

[0017] <Multilayer film> The above-mentioned spectacle lens has a multilayer film on each of the object-side surface and the object-side surface of the lens substrate. The multilayer film may be directly located on the surface of the lens substrate, or may be indirectly located on the surface of the lens substrate via one or more other layers. Examples of layers that can be formed between the lens substrate and the multilayer film include a polarizing layer, a photochromic layer, and a hard coat layer. By providing a hard coat layer, the durability (strength) of the spectacle lens can be increased. The hard coat layer can be, for example, a cured layer obtained by curing a curable composition. For details of the hard coat layer, see, for example, paragraphs 0025 to 0028 and 0030 of JP-A-2012-128135. In addition, a primer layer for improving adhesion may be formed between the lens substrate and the above-mentioned multilayer film. For details of the primer layer, see, for example, paragraphs 0029 to 0030 of JP-A-2012-128135.

[0018] The multilayer film may have a laminated structure in which high and low refractive index layers are alternately laminated. In the present invention and this specification, the terms "high" and "low" in relation to the high and low refractive index layers are relative expressions with respect to the refractive index of the lens substrate contained in the spectacle lens. The high refractive index layer refers to a layer having a higher refractive index than the lens substrate. The low refractive index layer refers to a layer having a lower refractive index than the lens substrate. The multilayer film may contain three or more layers having different refractive indices. In the present invention and this specification, the "refractive index" refers to the refractive index for light with a wavelength of 500 nm. The refractive index of the lens substrate of the spectacle lens is generally about 1.50 to 1.76, the low refractive index layer may be a layer having a refractive index of 1.50 or less, and the high refractive index layer may be a layer having a refractive index of 1.76 or more. The refractive index of the high refractive index layer can be, for example, from 2.00 to 2.40, and can also be from 2.00 to 2.20. Regarding the low refractive index layer, in the multilayer film on the surface 2 side, it is preferable that the refractive index of one or more low refractive index layers is 1.20 or more and 1.38 or less. Hereinafter, a low refractive index layer having a refractive index of 1.20 or more and 1.38 or less is referred to as an "ultra-low refractive index layer". The number of ultra-low refractive index layers included in the multilayer film on the surface 1 side and the multilayer film on the surface 2 side can be 0 layers or more and 2 layers or less, preferably 0 layers or more and 1 layer or less, more preferably 1 layer for the surface 2 side, and more preferably 0 layers for the surface 1 side. In one embodiment, the low refractive index layer can be located in the outermost layer of the multilayer film on the surface 2 side. The multilayer film including the ultra-low refractive index layer may also include one or more low refractive index layers other than the ultra-low refractive index layer. The refractive index of such a low refractive index layer may be, for example, 1.44 or more and 1.49 or less. Furthermore, a multilayer film that does not include an ultra-low refractive index layer can include one or more layers having a refractive index of 1.44 or more and 1.49 or less as a low refractive index layer. However, as described above, the designations "high" and "low" regarding the high refractive index layer and the low refractive index layer are relative designations with respect to the refractive index of the lens substrate, and therefore the refractive indices of the high refractive index layer and the low refractive index layer are not limited to the above ranges.

[0019] As the high refractive index material constituting the high refractive index layer and the low refractive index material constituting the low refractive index layer, inorganic materials, organic materials, or organic-inorganic composite materials can be used, and from the viewpoint of film formability, etc., inorganic materials are preferred. That is, the multilayer film is preferably an inorganic multilayer film. Specifically, the high refractive index material constituting the high refractive index layer is zirconium oxide (e.g., ZrO 2 ), tantalum oxide (e.g., Ta 2 O 5 ), titanium oxides (e.g., TiO 2 ), aluminum oxide (e.g. Al 2 O 3 ), yttrium oxide (e.g. Y 2 O 3 ), hafnium oxide (e.g. HfO 2 ) and niobium oxides (e.g. Nb 2 O 5On the other hand, examples of the low refractive index material constituting the low refractive index layer include silicon oxides (e.g., SiO 2 ), magnesium fluoride (e.g. MgF 2 ) and barium fluoride (e.g., BaF 2 In the above examples, the oxides and fluorides are shown in terms of stoichiometric composition for convenience, but those in which oxygen or fluorine is deficient or excessive from the stoichiometric composition can also be used as the high refractive index material or low refractive index material.

[0020] Preferably, the high refractive index layer is a film mainly composed of a high refractive index material, and the low refractive index layer is a film mainly composed of a low refractive index material. Here, the main component is a component that occupies the largest amount in the film, and is usually a component that occupies about 50% by mass to 100% by mass, and further about 90% by mass to 100% by mass, based on the mass of the film. Such a film (e.g., a deposition film) can be formed by forming a film using a film forming material (e.g., a vacuum deposition source, a sputtering target, etc.) mainly composed of the above-mentioned high refractive index material or low refractive index material. The main component of the film forming material is the same as above. The film and the film forming material may contain impurities that are inevitably mixed in, and may also contain other components, such as other inorganic substances and known additive components that play a role in assisting film formation, within a range that does not impair the function performed by the main component.

[0021] A known film forming method can be used as a method for forming the multilayer film. From the viewpoint of ease of film formation, it is preferable to form the film by vapor deposition. That is, each layer included in the multilayer film is preferably a vapor deposition film. A vapor deposition film means a film formed by vapor deposition. In the present invention and this specification, "vapor deposition" includes dry methods such as vacuum deposition, ion plating, and sputtering. In the vacuum deposition method, an ion beam assisted method in which an ion beam is irradiated simultaneously during vapor deposition may be used. As the sputtering method, a DC (Direct Current) method, an RF (Radio Frequency) method, etc. may be used. With regard to the ultra-low refractive index layer, the inventor's study newly found that simultaneous film formation by vacuum deposition and DC sputtering is preferable for forming the ultra-low refractive index layer. The refractive index of the ultra-low refractive index layer can be controlled by adjusting the current value during film formation by the vacuum deposition method, the gas flow rate and input power during film formation by the DC sputtering method, etc.

[0022] The multilayer film on the surface 1 side and the multilayer film on the surface 2 side can be, for example, a multilayer film in which high refractive index layers and low refractive index layers are alternately stacked to a total of 7 layers or more. The total number of high refractive index layers and low refractive index layers can be, for example, 11 layers or less. The film thickness of the high refractive index layer and the film thickness of the low refractive index layer can be determined according to the layer structure. In detail, the combination of layers included in the multilayer film and the film thickness of each layer can be determined by optical simulation using a known method based on the refractive index of the film forming material for forming the high refractive index layer and the low refractive index layer and various physical properties that are desired to be imparted to the eyeglass lens by providing the multilayer film.

[0023] The ultra-low refractive index layer can be a layer containing silicon oxide, and is preferably a layer mainly composed of silicon oxide. The multilayer film including such an ultra-low refractive index layer can include one or more layers containing silicon oxide other than the ultra-low refractive index layer as a low refractive index layer. Such a low refractive index layer is preferably a layer mainly composed of silicon oxide. Examples of the high refractive index layer contained in the multilayer film include a layer containing zirconium oxide, a layer containing niobium oxide, and a layer containing tantalum oxide, and it is preferable that these layers are layers containing the above oxides as the main component. In the multilayer film, the high refractive index layer and the low refractive index layer may be in direct contact with each other, or the multilayer film may include at least one laminate structure in which a conductive oxide layer, described later, is present between the high refractive index layer and the low refractive index layer.

[0024] The thickness of each of the high refractive index layers and low refractive index layers included in the multilayer film can be, for example, 1 to 500 nm, and the total thickness of the multilayer film can be, for example, 100 to 900 nm (including the thickness of the conductive oxide layer if a conductive oxide layer is included).

[0025] In addition to the high refractive index layer and low refractive index layer described above, the multilayer film may also include one or more layers containing a conductive oxide (also referred to as "conductive oxide layer") at any position of the multilayer film. The conductive oxide layer may be a layer containing a conductive oxide as a main component, and may preferably be a vapor deposition film of a conductive oxide formed by vapor deposition using a vapor deposition source containing a conductive oxide as a main component. From the viewpoint of transparency of the eyeglass lens, the conductive oxide layer is preferably an indium tin oxide (ITO) layer having a thickness of 10 nm or less, a tin oxide layer having a thickness of 10 nm or less, and a titanium oxide layer having a thickness of 10 nm or less. An indium tin oxide (ITO) layer is a layer containing ITO as a main component. This also applies to a tin oxide layer and a titanium oxide layer. In the present invention and this specification, an indium tin oxide (ITO) layer having a thickness of 10 nm or less, a tin oxide layer having a thickness of 10 nm or less, and a titanium oxide layer having a thickness of 10 nm or less are not considered as the "high refractive index layer" and the "low refractive index layer" contained in the multilayer film. That is, even if one or more of these layers are contained in the multilayer film, these layers are not considered to be "high refractive index layer" or "low refractive index layer". The thickness of the above-mentioned conductive oxide layer having a thickness of 10 nm or less can be, for example, 0.1 nm or more.

[0026] Furthermore, a further functional film can be formed on the multilayer film. Examples of such a functional film include various functional films such as a water-repellent or hydrophilic antifouling film, an antifogging film, etc. For these functional films, known techniques can be applied.

[0027] <Various physical properties of eyeglass lens surfaces> (Reflection properties) In the above-mentioned spectacle lens, the maximum reflectance value of either the object-side surface or the eyeball-side surface exceeds 2.00% in the wavelength band of 380 nm to 780 nm, and the other surface has a maximum reflectance value of 2.00% or less in the wavelength band of 380 nm to 780 nm or has no maximum value in the wavelength band of 380 nm to 780 nm. The spectacle lens surface having a maximum value of more than 2.00% in the wavelength band of 380 nm to 780 nm is called "surface 1." On surface 1, the maximum value can be, for example, 2.10% or more, 2.50% or more, 3.00% or more, 3.50% or more, or 4.00% or more. In addition, the maximum value can be, for example, 10.00% or less, 9.00% or less, 8.00% or less, 7.00% or less, or 6.00% or less. The surface of the spectacle lens other than surface 1 is referred to as "surface 2." The maximum value in the wavelength band of 380 nm to 780 nm can be 2.00% or less, and can also be 1.50% or less, 1.00% or less, 0.80% or less, or 0.60% or less. The maximum value of surface 2 in the wavelength band of 380 nm to 780 nm can be, for example, 0.10% or more, or 0.20% or more. In one embodiment, surface 1 is the object side surface of the spectacle lens, and in another embodiment, it is the eyeball side surface of the spectacle lens. Therefore, in one embodiment, surface 2 is the eyeball side surface of the spectacle lens, and in another embodiment, it is the object side surface of the spectacle lens. From the viewpoint of keeping low the amount of reflected light that enters the eyeball side surface of the spectacle lens from behind the spectacle wearer, is reflected by this surface, and enters the spectacle wearer's eye, it is preferable that the reflectance of the eyeball side surface of the spectacle lens is low. From this viewpoint, it is preferable that the eyeball side surface of the spectacle lens is surface 2.

[0028] From the viewpoint of reducing ghost light intensity of the XYZ tristimulus values, the above-mentioned eyeglass lens satisfies all of the following formulas 1 to 3. By designing the multilayer film on the surface 1 side and the multilayer film on the surface 2 side, it is possible to obtain an eyeglass lens that satisfies formulas 1 to 3. Formula 1: Rb1*Rb2<2.0 Formula 2: Rg1*Rg2<2.0 Formula 3: Rr1*Rr2<2.0

[0029] During the ceremony, Rb1: average reflectance of surface 1 in the wavelength band of 420 to 440 nm, Rb2: average reflectance of surface 2 in the wavelength band of 420 to 440 nm, Rg1: average reflectance of surface 1 in the wavelength band of 530 to 540 nm, Rg2: average reflectance of surface 2 in the wavelength band of 530 to 540 nm, Rr1: average reflectance of surface 1 in the wavelength bands of 440 to 460 nm and 560 to 580 nm, Rr2: average reflectance of surface 2 in the wavelength bands of 440 to 460 nm and 560 to 580 nm, Rb2, Rg2 and Rr2 are each 2.00% or less.

[0030] The units of Rb1, Rb2, Rg1, Rg2, Rr1 and Rr2 are "%", but in the present invention and this specification, "Rb1*Rb2", "Rg1*Rg2" and "Rg1*Rg2" are expressed without units.

[0031] Each value of "Rb1*Rb2", "Rg1*Rg2" and "Rg1*Rg2" is less than 2.0, and is preferably 1.8 or less, more preferably 1.6 or less, 1.4 or less, 1.2 or less, and 1.0 or less. It is more preferable that all values ​​of "Rb1*Rb2", "Rg1*Rg2" and "Rg1*Rg2" are 1.8 or less, more preferably 1.6 or less, even more preferably 1.4 or less, even more preferably 1.2 or less, and even more preferably 1.0 or less. In addition, each value of "Rb1*Rb2", "Rg1*Rg2" and "Rg1*Rg2" can be 0.0, 0.0 or more, or 0.1 or more.

[0032] (XYZ stimulus values ​​of ghost light) In the above-mentioned spectacle lens, the reflection characteristics of surface 1 and surface 2 satisfy formulas 1 to 3. By controlling the reflection characteristics in this way, it is possible to reduce ghost light intensity of the XYZ tristimulus values. In the above-mentioned spectacle lens, when the multiply reflected integrated ghost light intensity, excluding the light that has been transmitted without being reflected once, is evaluated by the tristimulus values ​​XYZ, it is preferable that the values ​​of X, Y and Z (XYZ stimulus values ​​of ghost light) are all 1.50E-02 or less, more preferably that one or more of the values ​​of X, Y and Z are 5.00E-03 or less, more preferably that two or more of the values ​​of X, Y and Z are 5.00E-03 or less, and more preferably that all of the values ​​of X, Y and Z are 5.00E-03 or less. Spectacle lenses with such low ghost light intensity are preferable because they have excellent visibility. Each of the above values ​​of X, Y, and Z can be, for example, 5.00E-06 or more, but since a lower value is preferable from the standpoint of improving the visibility of the spectacle lens, each value can be below the range exemplified here.

[0033] From the viewpoint of improving the appearance quality of the eyeglass lens, it is preferable that the reflected color of one surface of the eyeglass lens does not differ greatly from that of the other surface. However, in the eyeglass lens disclosed in the above-mentioned Japanese Patent No. 6073355 (Patent Document 1), the reflection of one surface of the eyeglass lens is made to have a minimum value near the wavelength where the reflection of the other surface is made to have a maximum value, thereby reducing the intensity of ghost light, so that a large difference in reflected color is likely to occur between one surface and the other surface of the eyeglass lens. In contrast, the above-mentioned eyeglass lens makes it possible to reduce the ghost light intensity of the XYZ tristimulus values ​​without making the reflection colors of surfaces 1 and 2 significantly different from each other by making the reflection characteristics of surfaces 1 and 2 satisfy formulas 1 to 3. Furthermore, in the above-mentioned eyeglass lens, by controlling the reflection characteristics of surface 1 and surface 2 to satisfy formulas 1 to 3 while adjusting the reflection to match the blue light blocking function and color according to personal preference, it is possible to reduce the ghost light intensity of the XYZ tristimulus values ​​while achieving the desired function and color according to personal preference.

[0034] (dominant wavelength) The term "dominant wavelength" refers to a numerical index of the wavelength of the color of light sensed by the human eye, and in this invention and this specification, the term "dominant wavelength" refers to a value measured from the measurement target surface side of the eyeglass lens in accordance with Annex JA of JIS Z 8781-3:2016. As described above, in the above-mentioned spectacle lens, ghost light intensity of the XYZ tristimulus values ​​can be reduced without making the reflection colors of surface 1 and surface 2 significantly different. In such a spectacle lens, the difference in dominant wavelength between surface 1 and surface 2 is preferably 70 nm or less, more preferably 60 nm or less, further preferably 50 nm or less, and more preferably 40 nm or less, 30 nm or less, 20 nm or less, and 10 nm or less in that order. The difference in dominant wavelength between surface 1 and surface 2 can be 0 nm or more, more than 0 nm, or 1 nm or more. The smaller the difference in dominant wavelength between surface 1 and surface 2, the more preferable it is from the viewpoint of improving the appearance quality of the spectacle lens. The difference in dominant wavelength between surface 1 and surface 2 is the absolute value of the difference between the dominant wavelength of surface 1 and the dominant wavelength of surface 2. Either the dominant wavelength of surface 1 or the dominant wavelength of surface 2 may be larger. The dominant wavelength of surface 1 and the dominant wavelength of surface 2 may be, for example, 420 nm or more and 650 nm or less, but are not limited to this range.

[0035] <Lens substrate> The lens substrate contained in the above-mentioned spectacle lens can be a plastic lens substrate or a glass lens substrate. The glass lens substrate can be, for example, a lens substrate made of inorganic glass. As the lens substrate, a plastic lens substrate is preferable from the viewpoint of being lightweight and not easily broken. Examples of the plastic lens substrate include styrene resins such as (meth)acrylic resins, polycarbonate resins, allyl resins, allyl carbonate resins such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resins, polyester resins, polyether resins, urethane resins obtained by reacting an isocyanate compound with a hydroxy compound such as diethylene glycol, thiourethane resins obtained by reacting an isocyanate compound with a polythiol compound, and a cured product (generally called a transparent resin) obtained by curing a curable composition containing a (thio)epoxy compound having one or more disulfide bonds in the molecule. The curable composition can also be called a polymerizable composition. The lens substrate can contain known additives. One example of the additives is an ultraviolet absorbing agent. A lens substrate containing an ultraviolet absorbing agent can reduce the amount of ultraviolet light entering the object side surface and entering the eye of the spectacle wearer.

[0036] The lens substrate may be either uncolored (colorless lens) or colored (colored lens). The refractive index of the lens substrate may be, for example, about 1.50 to 1.76. However, the refractive index of the lens substrate is not limited to the above range, and may be within the above range or may be above or below the above range. The lens substrate may be a lens having refractive power (so-called prescription lens) or a lens without refractive power (so-called non-prescription lens).

[0037] The spectacle lens may be any of various lenses, such as a single-focus lens, a multifocal lens, or a progressive power lens. The type of lens is usually determined by the surface shapes of both sides of the lens substrate. The surface of the lens substrate may be convex, concave, or flat. In normal lens substrates and spectacle lenses, the object side surface is convex and the eyeball side surface is concave. However, the present invention is not limited thereto.

[0038] [glasses] A further aspect of the present invention relates to glasses equipped with the glasses lens according to the above-mentioned aspect of the present invention. Details of the glasses lens included in the glasses are as described above. The glasses can achieve good visibility by being equipped with such glasses lens. There are no particular limitations on the configuration of the glasses, such as the frame, and publicly known technology can be applied. EXAMPLES

[0039] The present invention will be further described below with reference to examples, although the present invention is not limited to the embodiments shown in the examples.

[0040] [Multilayer film deposition method] In Examples 1 to 4 and Comparative Example 1, the multilayer deposition film was formed on both the eyeball side and the object side by stacking the first layer, the second layer, and so on from the lens substrate side (hard coat side) to the spectacle lens surface side using the deposition sources shown in the upper and lower columns of the tables below in order, so that the outermost layer on the spectacle lens surface side was a layer formed by the deposition source shown in the bottom column of each table. In these Examples and Comparative Examples, deposition sources made of oxides shown in the tables were used, excluding impurities that may be inevitably mixed in, and each layer was formed in sequence with a thickness shown in the tables. The film thickness is a physical film thickness, and the unit is nm. In the tables below, the layer described as "ultra-low refractive index layer" is a layer with a refractive index of 1.20 to 1.38 measured by the method described below.

[0041] In Examples 1 to 4 and Comparative Example 1, a multilayer vapor deposition film having a layer structure shown in the tables below was formed on the hard coat surfaces of the convex side (object side) and concave side (eyeball side) of a plastic lens substrate (colorless lens) that had both sides optically finished and previously coated with a hard coat ("HC" in the tables below), with the object-side surface being a convex surface and the eyeball-side surface being a concave surface. Each layer other than the ultra-low refractive index layer was formed by an ion beam assisted method using oxygen gas and argon gas as assist gases. In Examples 1 to 4, the layers confirmed to be ultra-low refractive index layers were formed by simultaneous deposition using vacuum deposition and DC sputtering using oxygen gas and argon gas. The current value during deposition using the ion beam assisted method was 250 mA, the gas flow rates during deposition using the DC sputtering method were oxygen gas: 500 sccm, argon gas: 1000 sccm, and the input power was 500 W.

[0042] In the following, a layer that does not fall under the category of an ultra-low refractive index layer is a SiO 2 The layer formed using the deposition source is called "SiO 2 layer", ZrO 2 The layer formed using the evaporation source is called "ZrO 2 The layer is written as "SnO 2 The layer formed using the deposition source is a conductive oxide layer. SiO 2 The layer formed using the deposition source and confirmed to be an ultra-low refractive index layer was called "SiO 2 It is described as "ultra-low refractive index layer."

[0043] [Refractive index of each layer] The refractive index of each layer was determined by the following method. A single layer film was formed on a glass substrate under the same film-forming conditions as those for each layer of the multilayer film, to obtain a laminate of the glass substrate and the single layer film. The surface reflectance of the surface on which the monolayer film of the laminate was formed was measured using a lens reflectance measuring instrument USPM-RU manufactured by Olympus Corporation, and the refractive index was determined by optical thin film analysis of the obtained spectral reflectance. The refractive indexes of the layers other than the ultra-low refractive index layer in the multilayer films produced in the examples and comparative examples were as follows. SiO2 Layer:1.47 ZrO 2 Layer:2.08

[0044] SiO in the multilayer films prepared in Examples 1 to 4 2 The refractive index of the ultra-low refractive index layer determined by the above method was 1.23.

[0045] [Reflection characteristics of eyeglass lens surfaces] The normal incidence reflectance characteristics at the optical center were measured for the object-side surface and the eyeball-side surface of each of the spectacle lenses in Examples 1 to 4 and Comparative Example 1. The measurements were performed using an Olympus lens reflectance measuring instrument USPM-RU (measurement pitch: 1 nm, measurement conditions set to normal incidence). The reflectances of the object-side surface and the eyeball-side surface of each of the spectacle lenses of Examples 1 to 4 and Comparative Example 1 measured above at each wavelength are shown in FIGS. From the measurement results of the reflection characteristics, the maximum value was determined by the method described above. Furthermore, the dominant wavelengths Rb1, Rb2, Rg1, Rg2, Rr1, and Rr2 were determined from the above reflection characteristic measurement results. The values ​​of the left sides of formulas 1 to 3 were calculated from the determined Rb1, Rb2, Rg1, Rg2, Rr1, and Rr2.

[0046] [XYZ stimulus values ​​of ghost light] For each of the eyeglass lenses of Examples 1 to 4 and Comparative Example 1, the values ​​of X, Y, and Z were obtained by the method described above when excluding light that was transmitted without being reflected even once and evaluating the integrated ghost light intensity after multiple reflections using the tristimulus values ​​XYZ.

[0047] As shown in the table below, the spectacle lenses of Examples 1 to 4 satisfy formulas 1 to 3, while the spectacle lens of Comparative Example 1 does not satisfy formulas 1 and 3. From the XYZ stimulus values ​​of ghost light intensity shown in the table below, it can be confirmed that in each of the eyeglass lenses of Examples 1 to 4, the ghost light intensity is low at the XYZ tristimulus values, whereas in Comparative Example 1, the ghost light intensity is high at the XZ stimulus value.

[0048]

Table 1

[0049]

Table 2

[0050]

Table 3

[0051]

Table 4

[0052]

Table 5

[0053]

Table 6

[0054]

Table 7

[0055]

Table 8

[0056]

Table 9

[0057]

Table 10

[0058]

Table 11

[0059] [Table 12]

[0060] [Table 13]

[0061] [Table 14]

[0062] [Table 15]

[0063] [Table 16]

[0064] [Table 17]

[0065] [Table 18]

[0066] [Table 19]

[0067] [Table 20]

[0068] The various aspects described herein may be combined in any combination of two or more.

[0069] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0070] The present invention is useful in the field of manufacturing eyeglass lenses and eyeglasses.

Claims

1. a lens substrate; and a multilayer film located on an object-side surface and an eyeball-side surface of the lens substrate, the maximum value in the wavelength band of 380 nm to 780 nm on the object-side surface or eyeball-side surface of the spectacle lens exceeds 2.00%, The surface where the maximum value exceeds 2.00% is designated as surface 1, and the other surface is designated as surface 2. Rb1 is the average reflectance of surface 1 in the wavelength band of 420 to 440 nm, Rb2 is the average reflectance of surface 2 in the wavelength band of 420 to 440 nm, Rg1 is the average reflectance of surface 1 in the wavelength band of 530 to 540 nm, Rg2 is the average reflectance of surface 2 in the wavelength band of 530 to 540 nm, Rr1 is the average reflectance of surface 1 in the wavelength bands of 440 to 460 nm and 560 to 580 nm, Rr2 is the average reflectance of surface 2 in the wavelength bands of 440 to 460 nm and 560 to 580 nm, Rb2, Rg2 and Rr2 are 2.00% or less, and A spectacle lens that satisfies all of the following formulas 1 to 3. Formula 1: Rb1*Rb2<2.0 Formula 2: Rg1*Rg2<2.0 Formula 3: Rr1*Rr2<2.0

2. 2. The spectacle lens according to claim 1, wherein the difference in dominant wavelength between surface 1 and surface 2 is 70 nm or less.

3. 2. The eyeglass lens according to claim 1, wherein when the integrated ghost light intensity resulting from multiple reflections is evaluated using tristimulus values ​​X, Y, and Z, excluding light that has been transmitted without being reflected even once, the values ​​of X, Y, and Z are all 1.50E-02 or less.

4. 4. The eyeglass lens according to claim 3, wherein the values ​​of X, Y, and Z are all 5.00E-03 or less.

5. 2. The eyeglass lens according to claim 1, wherein the multilayer film on the surface 2 side includes one or more layers having a refractive index of 1.20 or more and 1.38 or less.

6. 6. The eyeglass lens according to claim 5, wherein the multilayer film on the surface 2 side includes one or more layers having a refractive index of 2.00 or more and 2.40 or less.

7. 7. The eyeglass lens according to claim 6, wherein the multilayer film on the surface 2 side includes one or more layers having a refractive index of 1.44 or more and 1.49 or less.

8. 8. The spectacle lens according to claim 7, wherein the total number of high refractive index layers and low refractive index layers in the multilayer film on the surface 2 side is 7 or more.

9. The difference in dominant wavelength between surface 1 and surface 2 is 70 nm or less, When the intensity of the accumulated ghost light resulting from multiple reflections is evaluated using tristimulus values ​​X, Y, and Z, excluding light that has been transmitted without being reflected even once, the values ​​of X, Y, and Z are all 1.50E-02 or less; the multilayer film on the surface 2 side includes one or more layers having a refractive index of 1.20 or more and 1.38 or less, one or more layers having a refractive index of 2.00 or more and 2.40 or less, and one or more layers having a refractive index of 1.44 or more and 1.49 or less; and 2. The eyeglass lens according to claim 1, wherein the total number of high refractive index layers and low refractive index layers in the multilayer film on the surface 2 side is 7 or more.

10. 10. The eyeglass lens according to claim 9, wherein the values ​​of X, Y, and Z are all 5.00E-03 or less.

11. Eyeglasses comprising the eyeglass lens according to any one of claims 1 to 10.

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